Sample records for distinct population segment

  1. Population segments with disabilities

    E-Print Network [OSTI]

    Stough, Laura

    with disabilities given the large prevalence of this population throughout the world, the intensity of their social vulnerabilities in disaster, and recent federal mandates that specify equal access for individuals with disabilities to emergency preparedness..., as “special needs” populations. More recently, the functional-needs approach to defining disability-related needs during disaster was adopted by the Federal Emergency Management Agency (2010) in its Comprehensive Preparedness Guide 101 and in the National...

  2. STATUS REVIEW OF THE EASTERN DISTINCT POPULATION SEGMENT OF STELLER SEA LION

    E-Print Network [OSTI]

    ............................................................. 8 1.6 Status Review History and Receipt of Petitions to Delist

  3. A redshift - observation-time relation for gamma-ray bursts: evidence of a distinct sub-luminous population

    E-Print Network [OSTI]

    E. J. Howell; D. M. Coward

    2013-02-19T23:59:59.000Z

    We show how the redshift and peak-flux distributions of gamma-ray bursts (GRBs) have an observation time dependence that can be used to discriminate between different burst populations. We demonstrate how observation time relations can be derived from the standard integral distributions and that they can differentiate between GRB populations detected by both the BATSE and \\emph{Swift} satellites. Using \\emph{Swift} data we show that a redshift--observation-time relation (log\\,$Z$\\,--\\,log\\,$T$) is consistent with both a peak-flux\\,--\\,observation time relation (log\\,$P$\\,--\\,log\\,$T$) and a standard log\\,$N$\\,--\\,log\\,$P$ brightness distribution. As the method depends only on rarer small-$z$ events, it is invariant to high-$z$ selection effects. We use the log\\,$Z$\\,--\\,log\\,$T$ relation to show that sub-luminous GRBs are a distinct population occurring at a higher rate of order $150^{+180}_{-90} \\mathrm{Gpc}^{-3}\\mathrm{yr}^{-1}$. Our analysis suggests that GRB 060505 -- a relatively nearby GRB observed without any associated supernova -- is consistent with a sub-luminous population of bursts. Finally, we suggest that our relations can be used as a consistency test for some of the proposed GRB spectral energy correlations.

  4. Loading and pre-loading processes generate a distinct siRNA population in Tetrahymena

    SciTech Connect (OSTI)

    Mochizuki, Kazufumi, E-mail: kazufumi.mochizuki@imba.oeaw.ac.at; Kurth, Henriette M.

    2013-07-05T23:59:59.000Z

    Highlights: •The Tetrahymena Argonaute protein Twi1p binds to ?28–30-nt siRNAs called scnRNAs. •The size of scnRNAs is determined during a pre-loading process. •The 5? uracil bias of scnRNAs is attributed to pre-loading and loading processes. •The thermodynamic asymmetry of scnRNA duplex doesnot affect the guide strand decision. •scnRNAs may be produced non-sequentially from dsRNA substrates by Dicer. -- Abstract: The various properties of small RNAs, such as length, terminal nucleotide, thermodynamic asymmetry and duplex mismatches, can impact their sorting into different Argonaute proteins in diverse eukaryotes. The developmentally regulated 26- to 32-nt siRNAs (scnRNAs) are loaded to the Argonaute protein Twi1p and display a strong bias for uracil at the 5? end. In this study, we used deep sequencing to analyze loaded and unloaded populations of scnRNAs. We show that the size of the scnRNA is determined during a pre-loading process, whereas their 5? uracil bias is attributed to both pre-loading and loading processes. We also demonstrate that scnRNAs have a strong bias for adenine at the third base from the 3? terminus, suggesting that most scnRNAs are direct Dicer products. Furthermore, we show that the thermodynamic asymmetry of the scnRNA duplex does not affect the guide and passenger strand decision. Finally, we show that scnRNAs frequently have templated uracil at the last base without a strong bias for adenine at the second base indicating non-sequential production of scnRNAs from substrates. These findings provide a biochemical basis for the varying attributes of scnRNAs, which should help improve our understanding of the production and turnover of scnRNAs in vivo.

  5. Polymorphisms of the acid sensing histidine kinase gene arsS in Helicobacter pylori populations from anatomically distinct gastric sites

    E-Print Network [OSTI]

    Forsyth, Mark

    Polymorphisms of the acid sensing histidine kinase gene arsS in Helicobacter pylori populations 2012 Available online 30 August 2012 Keywords: Helicobacter pylori arsS Polymorphism Homopolymeric as environmental or host conditions change. Unusual among Helicobacter pylori phase variable or contingency genes

  6. Mon. Not. R. Astron. Soc. 392, 91103 (2009) doi:10.1111/j.1365-2966.2008.14063.x Low-luminosity gamma-ray bursts as a distinct GRB population: a firmer

    E-Print Network [OSTI]

    Zhang, Bing

    2009-01-01T23:59:59.000Z

    -luminosity gamma-ray bursts as a distinct GRB population: a firmer case from multiple criteria constraints-BeppoSAX gamma-ray burst GRB 980425, both with much lower luminosity and redshift compared to other observed Gamma-ray Observatory (CGRO)/BATSE and Swift/BAT and the redshift-known gamma-ray burst (GRB) sample, we

  7. Two-dimensional segmentation of small convective patterns in radiation hydrodynamics simulations

    E-Print Network [OSTI]

    Lemmerer, B; Hanslmeier, A; Veronig, A; Thonhofer, S; Grimm-Strele, H; Kariyappa, R

    2015-01-01T23:59:59.000Z

    Recent results from high-resolution solar granulation observations indicate the existence of a population of small granular cells that are smaller than 600 km in diameter. These small convective cells strongly contribute to the total area of granules and are located in the intergranular lanes, where they form clusters and chains. We study high-resolution radiation hydrodynamics simulations of the upper convection zone and photosphere to detect small granular cells, define their spatial alignment, and analyze their physical properties. We developed an automated image-segmentation algorithm specifically adapted to high-resolution simulations to identify granules. The resulting segmentation masks were applied to physical quantities, such as intensity and vertical velocity profiles, provided by the simulation. A new clustering algorithm was developed to study the alignment of small granular cells. This study shows that small granules make a distinct contribution to the total area of granules and form clusters of ...

  8. Impact assisted segmented cutterhead

    DOE Patents [OSTI]

    Morrell, Roger J. (Bloomington, MN); Larson, David A. (Minneapolis, MN); Ruzzi, Peter L. (Eagan, MN)

    1992-01-01T23:59:59.000Z

    An impact assisted segmented cutterhead device is provided for cutting various surfaces from coal to granite. The device comprises a plurality of cutting bit segments deployed in side by side relationship to form a continuous cutting face and a plurality of impactors individually associated with respective cutting bit segments. An impactor rod of each impactor connects that impactor to the corresponding cutting bit segment. A plurality of shock mounts dampening the vibration from the associated impactor. Mounting brackets are used in mounting the cutterhead to a base machine.

  9. Segmented rail linear induction motor

    SciTech Connect (OSTI)

    Cowan, M. Jr.; Marder, B.M.

    1996-09-03T23:59:59.000Z

    A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces. 6 figs.

  10. Segmented heat exchanger

    DOE Patents [OSTI]

    Baldwin, Darryl Dean (Lafayette, IN); Willi, Martin Leo (Dunlap, IL); Fiveland, Scott Byron (Metamara, IL); Timmons, Kristine Ann (Chillicothe, IL)

    2010-12-14T23:59:59.000Z

    A segmented heat exchanger system for transferring heat energy from an exhaust fluid to a working fluid. The heat exchanger system may include a first heat exchanger for receiving incoming working fluid and the exhaust fluid. The working fluid and exhaust fluid may travel through at least a portion of the first heat exchanger in a parallel flow configuration. In addition, the heat exchanger system may include a second heat exchanger for receiving working fluid from the first heat exchanger and exhaust fluid from a third heat exchanger. The working fluid and exhaust fluid may travel through at least a portion of the second heat exchanger in a counter flow configuration. Furthermore, the heat exchanger system may include a third heat exchanger for receiving working fluid from the second heat exchanger and exhaust fluid from the first heat exchanger. The working fluid and exhaust fluid may travel through at least a portion of the third heat exchanger in a parallel flow configuration.

  11. Optimal segmentation and packaging process

    DOE Patents [OSTI]

    Kostelnik, Kevin M. (Idaho Falls, ID); Meservey, Richard H. (Idaho Falls, ID); Landon, Mark D. (Idaho Falls, ID)

    1999-01-01T23:59:59.000Z

    A process for improving packaging efficiency uses three dimensional, computer simulated models with various optimization algorithms to determine the optimal segmentation process and packaging configurations based on constraints including container limitations. The present invention is applied to a process for decontaminating, decommissioning (D&D), and remediating a nuclear facility involving the segmentation and packaging of contaminated items in waste containers in order to minimize the number of cuts, maximize packaging density, and reduce worker radiation exposure. A three-dimensional, computer simulated, facility model of the contaminated items are created. The contaminated items are differentiated. The optimal location, orientation and sequence of the segmentation and packaging of the contaminated items is determined using the simulated model, the algorithms, and various constraints including container limitations. The cut locations and orientations are transposed to the simulated model. The contaminated items are actually segmented and packaged. The segmentation and packaging may be simulated beforehand. In addition, the contaminated items may be cataloged and recorded.

  12. Populations Population Ecology

    E-Print Network [OSTI]

    Dever, Jennifer A.

    - species interactions Abiotic factors: l Climate l Temperature l Moisture l Wind l Soil l Fire Biotic- Ã? mortality increases as population size increases or birth rate decreases" l Negative feedback

  13. Automated bone segmentation from dental CBCT images using patch-based sparse representation and convex optimization

    SciTech Connect (OSTI)

    Wang, Li; Gao, Yaozong; Shi, Feng; Liao, Shu; Li, Gang [Department of Radiology and BRIC, University of North Carolina at Chapel Hill, North Carolina 27599 (United States)] [Department of Radiology and BRIC, University of North Carolina at Chapel Hill, North Carolina 27599 (United States); Chen, Ken Chung [Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital Research Institute, Houston, Texas 77030 and Department of Stomatology, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan 70403 (China)] [Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital Research Institute, Houston, Texas 77030 and Department of Stomatology, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan 70403 (China); Shen, Steve G. F.; Yan, Jin [Department of Oral and Craniomaxillofacial Surgery and Science, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University College of Medicine, Shanghai, China 200011 (China)] [Department of Oral and Craniomaxillofacial Surgery and Science, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University College of Medicine, Shanghai, China 200011 (China); Lee, Philip K. M.; Chow, Ben [Hong Kong Dental Implant and Maxillofacial Centre, Hong Kong, China 999077 (China)] [Hong Kong Dental Implant and Maxillofacial Centre, Hong Kong, China 999077 (China); Liu, Nancy X. [Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital Research Institute, Houston, Texas 77030 and Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China 100050 (China)] [Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital Research Institute, Houston, Texas 77030 and Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China 100050 (China); Xia, James J. [Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital Research Institute, Houston, Texas 77030 (United States) [Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital Research Institute, Houston, Texas 77030 (United States); Department of Surgery (Oral and Maxillofacial Surgery), Weill Medical College, Cornell University, New York, New York 10065 (United States); Department of Oral and Craniomaxillofacial Surgery and Science, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University College of Medicine, Shanghai, China 200011 (China); Shen, Dinggang, E-mail: dgshen@med.unc.edu [Department of Radiology and BRIC, University of North Carolina at Chapel Hill, North Carolina 27599 and Department of Brain and Cognitive Engineering, Korea University, Seoul, 136701 (Korea, Republic of)] [Department of Radiology and BRIC, University of North Carolina at Chapel Hill, North Carolina 27599 and Department of Brain and Cognitive Engineering, Korea University, Seoul, 136701 (Korea, Republic of)

    2014-04-15T23:59:59.000Z

    Purpose: Cone-beam computed tomography (CBCT) is an increasingly utilized imaging modality for the diagnosis and treatment planning of the patients with craniomaxillofacial (CMF) deformities. Accurate segmentation of CBCT image is an essential step to generate three-dimensional (3D) models for the diagnosis and treatment planning of the patients with CMF deformities. However, due to the poor image quality, including very low signal-to-noise ratio and the widespread image artifacts such as noise, beam hardening, and inhomogeneity, it is challenging to segment the CBCT images. In this paper, the authors present a new automatic segmentation method to address these problems. Methods: To segment CBCT images, the authors propose a new method for fully automated CBCT segmentation by using patch-based sparse representation to (1) segment bony structures from the soft tissues and (2) further separate the mandible from the maxilla. Specifically, a region-specific registration strategy is first proposed to warp all the atlases to the current testing subject and then a sparse-based label propagation strategy is employed to estimate a patient-specific atlas from all aligned atlases. Finally, the patient-specific atlas is integrated into amaximum a posteriori probability-based convex segmentation framework for accurate segmentation. Results: The proposed method has been evaluated on a dataset with 15 CBCT images. The effectiveness of the proposed region-specific registration strategy and patient-specific atlas has been validated by comparing with the traditional registration strategy and population-based atlas. The experimental results show that the proposed method achieves the best segmentation accuracy by comparison with other state-of-the-art segmentation methods. Conclusions: The authors have proposed a new CBCT segmentation method by using patch-based sparse representation and convex optimization, which can achieve considerably accurate segmentation results in CBCT segmentation based on 15 patients.

  14. Co-Segmentation by Composition Alon Faktor

    E-Print Network [OSTI]

    Shapiro, Ehud

    Co-Segmentation by Composition Alon Faktor Michal Irani Dept. of Computer Science and Applied Math semantic category, we would like to co-segment the shared object. We define `good' co-segments to be ones which can be easily composed (like a puzzle) from large pieces of other co-segments, yet are difficult

  15. Distinctive Appliances: Proposed Penalty (2014-CE-23020)

    Broader source: Energy.gov [DOE]

    DOE alleged in a Notice of Proposed Civil Penalty that Distinctive Appliances Distributing Inc. failed to certify cooking products as compliant with the applicable energy conservation standards.

  16. Tailored Marketing for Under-Represented Population Segments | Department

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directed offOCHCO Overview OCHCOSystems Analysis Success Stories Systems AnalysisTESTIMONYTTWG LicensingUof

  17. Journal of Theoretical Biology 227 (2004) 397401 Evolutionary stability for large populations

    E-Print Network [OSTI]

    Gordon, Geoffrey J.

    population ESS, as distinct from Maynard Smith's infinite population ESS and Schaffer's finite population ESS. Building on Schaffer's finite population model, we define the large population ESS as a strategy which. The large population ESS is not equivalent to the infinite population ESS: we give examples of games

  18. Optimal segmentation and packaging process

    DOE Patents [OSTI]

    Kostelnik, K.M.; Meservey, R.H.; Landon, M.D.

    1999-08-10T23:59:59.000Z

    A process for improving packaging efficiency uses three dimensional, computer simulated models with various optimization algorithms to determine the optimal segmentation process and packaging configurations based on constraints including container limitations. The present invention is applied to a process for decontaminating, decommissioning (D and D), and remediating a nuclear facility involving the segmentation and packaging of contaminated items in waste containers in order to minimize the number of cuts, maximize packaging density, and reduce worker radiation exposure. A three-dimensional, computer simulated, facility model of the contaminated items are created. The contaminated items are differentiated. The optimal location, orientation and sequence of the segmentation and packaging of the contaminated items is determined using the simulated model, the algorithms, and various constraints including container limitations. The cut locations and orientations are transposed to the simulated model. The contaminated items are actually segmented and packaged. The segmentation and packaging may be simulated beforehand. In addition, the contaminated items may be cataloged and recorded. 3 figs.

  19. Engineering mesoscale structures with distinct dynamical implications

    E-Print Network [OSTI]

    Engineering mesoscale structures with distinct dynamical implications Anne-Ly Do1 , Johannes H that there are certain mesoscale subgraphs that have precise and distinct consequences for the system-level dynamics. In particular, if mesoscale symmetries are present then eigenvectors of the Jacobian localise on the symmetric

  20. Maximum entropy segmentation of broadcast news 

    E-Print Network [OSTI]

    Christensen, Heidi; Kolluru, BalaKrishna; Gotoh, Yoshihiko; Renals, Steve

    2005-01-01T23:59:59.000Z

    speech recognizer and subsequently segmenting the text into utterances and topics. A maximum entropy approach is used to build statistical models for both utterance and topic segmentation. The experimental work addresses the effect on performance...

  1. @ work' video segment features Robotic Software Engineer

    ScienceCinema (OSTI)

    Idaho National Laboratory

    2010-01-08T23:59:59.000Z

    @ work highlights Idaho National Laboratory employees and the jobs they perform.This segment features Robotic Software Engineer Miles Walton.

  2. Phylogenetic Resolution with mtDNA D-loop vs. HVS 1: Methodological Approaches in Anthropological Genetics Utilizing Four Siberian Populations

    E-Print Network [OSTI]

    Johnson, Stephen Michael

    2013-08-31T23:59:59.000Z

    on mitochondrial DNA in anthropological studies has utilized the hypervariable segment 1 (HVS 1) to reconstruct population history and structure, explore population ancestry, construct phylogenies, and answer questions about the origins of prehistoric populations...

  3. Segmented ceramic liner for induction furnaces

    DOE Patents [OSTI]

    Gorin, A.H.; Holcombe, C.E.

    1994-07-26T23:59:59.000Z

    A non-fibrous ceramic liner for induction furnaces is provided by vertically stackable ring-shaped liner segments made of ceramic material in a light-weight cellular form. The liner segments can each be fabricated as a single unit or from a plurality of arcuate segments joined together by an interlocking mechanism. Also, the liner segments can be formed of a single ceramic material or can be constructed of multiple concentric layers with the layers being of different ceramic materials and/or cellular forms. Thermomechanically damaged liner segments are selectively replaceable in the furnace. 5 figs.

  4. Cancer Epidemiology Population Health Sciences 750

    E-Print Network [OSTI]

    Sheridan, Jennifer

    -01/5/11-1 Cancer Epidemiology Population Health Sciences 750 3 credits When: Spring 2011 (1 Audience: This course is intended for students in health-related disciplines interested in cancer etiology. the unequal burden of cancer among populations and variations across time and geography, 2. the distinctive

  5. Shanghai and Hong Kong: Two Distinct Examples

    E-Print Network [OSTI]

    Spagnolo, Filippo

    Shanghai and Hong Kong: Two Distinct Examples of Education Reform in China 4 Strong PerformerS and SucceSSful reformerS in education: leSSonS from PiSa for the united StateS © OECD 2010 83 China has made reforms to its education system. This chapter looks at how China has made rapid progress, taking Shanghai

  6. Distinctly Ambitious www.hw.ac.uk

    E-Print Network [OSTI]

    Painter, Kevin

    , Duncan Hand at the James Watt Institute for High Value Manufacturing led a team to apply laser-based manufacturing processes to the production of dental products. The project led to the development of a laserDistinctly Ambitious www.hw.ac.uk Laser Machining #12;Cutting-edge engineering technology for laser

  7. Cooling system for three hook ring segment

    DOE Patents [OSTI]

    Campbell, Christian X.; Eng, Darryl; Lee, Ching-Pang; Patat, Harry

    2014-08-26T23:59:59.000Z

    A triple hook ring segment including forward, midsection and aft mounting hooks for engagement with respective hangers formed on a ring segment carrier for supporting a ring segment panel, and defining a forward high pressure chamber and an aft low pressure chamber on opposing sides of the midsection mounting hook. An isolation plate is provided on the aft side of the midsection mounting hook to form an isolation chamber between the aft low pressure chamber and the ring segment panel. High pressure air is supplied to the forward chamber and flows to the isolation chamber through crossover passages in the midsection hook. The isolation chamber provides convection cooling air to an aft portion of the ring segment panel and enables a reduction of air pressure in the aft low pressure chamber to reduce leakage flow of cooling air from the ring segment.

  8. Fluidized bed boiler having a segmented grate

    DOE Patents [OSTI]

    Waryasz, Richard E. (Longmeadow, MA)

    1984-01-01T23:59:59.000Z

    A fluidized bed furnace (10) is provided having a perforate grate (9) within a housing which supports a bed of particulate material including some combustibles. The grate is divided into a plurality of segments (E2-E6, SH1-SH5, RH1-RH5), with the airflow to each segment being independently controlled. Some of the segments have evaporating surface imbedded in the particulate material above them, while other segments are below superheater surface or reheater surface. Some of the segments (E1, E7) have no surface above them, and there are ignitor combustors (32, 34) directed to fire into the segments, for fast startup of the furnace without causing damage to any heating surface.

  9. Simultaneous Segmentation and Grading of Hippocampus for Patient Classification with Alzheimer's

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Simultaneous Segmentation and Grading of Hippocampus for Patient Classification with Alzheimer library used during our experiments was composed by 2 populations, 50 Cognitively Normal subjects (CN of the HC at the same time resulted in an efficient patient classification with a success rate of 90

  10. Method of manufacturing a large-area segmented photovoltaic module

    DOE Patents [OSTI]

    Lenox, Carl

    2013-11-05T23:59:59.000Z

    One embodiment of the invention relates to a segmented photovoltaic (PV) module which is manufactured from laminate segments. The segmented PV module includes rectangular-shaped laminate segments formed from rectangular-shaped PV laminates and further includes non-rectangular-shaped laminate segments formed from rectangular-shaped and approximately-triangular-shaped PV laminates. The laminate segments are mechanically joined and electrically interconnected to form the segmented module. Another embodiment relates to a method of manufacturing a large-area segmented photovoltaic module from laminate segments of various shapes. Other embodiments relate to processes for providing a photovoltaic array for installation at a site. Other embodiments and features are also disclosed.

  11. Learning Contextual Variations for Video Segmentation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Learning Contextual Variations for Video Segmentation Vincent Martin and Monique Thonnat INRIA.R.Martin, Monique.Thonnat}@sophia.inria.fr, http://www-sop.inria.fr/pulsar/ Abstract. This paper deals with video-illumination changes and long term changes are present. In this situation, the major difficulty at the segmentation

  12. Segmentation into fuzzy regions using topographic distance

    E-Print Network [OSTI]

    Philipp-Foliguet, Sylvie

    recognition from fuzzy regions. Keywords: Segmentation, Fuzzy region, Watershed, Color image, TopographicSegmentation into fuzzy regions using topographic distance SYLVIE PHILIPP­FOLIGUET 1 MARCELO@dcc.ufmg.br, arnaldo@dcc.ufmg.br 3 Supported by CAPES. Abstract. This paper exposes an algorithm that leads to a fuzzy

  13. Current segmented gamma-ray scanner technology

    SciTech Connect (OSTI)

    Bjork, C.W.

    1987-01-01T23:59:59.000Z

    A new generation of segmented gamma-ray scanners has been developed at Los Alamos for scrap and waste measurements at the Savannah River Plant and the Los Alamos Plutonium Facility. The new designs are highly automated and exhibit special features such as good segmentation and thorough shielding to improve performance.

  14. ngravs: Distinct gravitational interactions in GADGET-2

    E-Print Network [OSTI]

    Croker, K A S

    2015-01-01T23:59:59.000Z

    We discuss an extension of the massively parallel cosmological simulation code GADGET-2, which enables investigation of distinct gravitational force laws between particle species. In addition to simplifying investigations of a universally modified force law, the ngravs extension allows state-of-the-art collisionless cosmological simulations of quite exotic gravitational scenarios. We briefly review the algorithms used by GADGET-2, and present our extension to multiple gravities, highlighting additional features that facilitate consideration of exotic force laws. We discuss the accuracy and performance of the ngravs extension, both internally and with an unaltered GADGET-2, under all relevant operational modes. The ngravs extension is publicly released to the research community.

  15. Combining Multiple Knowledge Sources for Dialogue Segmentation in Multimedia Archives 

    E-Print Network [OSTI]

    Hsueh, Pei-Yun; Moore, Johanna D.

    2010-11-03T23:59:59.000Z

    Automatic segmentation is important for making multimedia archives comprehensible, and for developing downstream information retrieval and extraction modules. In this study, we explore approaches that can segment ...

  16. anterior segment optical: Topics by E-print Network

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

    Segmented Optics Henry W. Bergner Jr.a Materials Science Websites Summary: of the tooling itself. Keywords: Constellation-X, etched silicon, precision tooling, segmented x-ray...

  17. A Segmented, Enriched N-type Germanium Detector for Neutrinoless...

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

    Publications A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments. A Segmented, Enriched N-type Germanium Detector for Neutrinoless...

  18. A Segmented, Enriched N-type Germanium Detector for Neutrinoless...

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

    Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments. A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay...

  19. angiographic image segmentation: Topics by E-print Network

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

    Summary: Image segmentation is very essential and critical to image processing and pattern recognition. This survey provides a summary of color image segmentation techniques...

  20. automatic image segmentation: Topics by E-print Network

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

    Summary: Image segmentation is very essential and critical to image processing and pattern recognition. This survey provides a summary of color image segmentation techniques...

  1. avena coleoptile segments: Topics by E-print Network

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

    Summary: Image segmentation is very essential and critical to image processing and pattern recognition. This survey provides a summary of color image segmentation techniques...

  2. Status of Segmented Element Thermoelectric Generator for Vehicle...

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

    Segmented Element Thermoelectric Generator for Vehicle Waste Heat Recovery Status of Segmented Element Thermoelectric Generator for Vehicle Waste Heat Recovery Discusses progress...

  3. Automatic Lung Vessel Segmentation via Stacked Multiscale Feature Learning

    E-Print Network [OSTI]

    Toronto, University of

    Automatic Lung Vessel Segmentation via Stacked Multiscale Feature Learning Ryan Kiros, Karteek We introduce a representation learning approach to segmenting vessels in the lungs. Our algorithm

  4. Vane segment support and alignment device

    DOE Patents [OSTI]

    McLaurin, Leroy Dixon (Winter Springs, FL); Sizemore, John Derek (Orlando, FL)

    1999-01-01T23:59:59.000Z

    A support and alignment assembly for supporting and aligning a vane segment is provided. The support and alignment assembly comprises a torque plate which defines an opening for receiving an eccentric pin and a locking end member for receiving a lock socket member. An eccentric pin adjustably supported by the torque plate opening for supporting and aligning a vane segment is provided. A lock socket member adapted to securely receive the eccentric pin and rotated therewith, and adjustably engage the torque plate locking end is provided. The lock socket member receives the eccentric pin, such that when the eccentric pin is adjusted to align the vane segment, the lock socket member engages the torque plate locking end to secure the vane segment in the desired position.

  5. Vane segment support and alignment device

    DOE Patents [OSTI]

    McLaurin, L.D.; Sizemore, J.D.

    1999-07-13T23:59:59.000Z

    A support and alignment assembly for supporting and aligning a vane segment is provided. The support and alignment assembly comprises a torque plate which defines an opening for receiving an eccentric pin and a locking end member for receiving a lock socket member. An eccentric pin adjustably supported by the torque plate opening for supporting and aligning a vane segment is provided. A lock socket member adapted to securely receive the eccentric pin and rotated therewith, and adjustably engage the torque plate locking end is provided. The lock socket member receives the eccentric pin, such that when the eccentric pin is adjusted to align the vane segment, the lock socket member engages the torque plate locking end to secure the vane segment in the desired position. 5 figs.

  6. On the Nadeau-Taylor Theory of Conserved Chromosome Segments

    E-Print Network [OSTI]

    Sankoff, David

    of non- empty segments as a function ofthe number of genes and segments. We propose a rapid algorithm is a fellow of the Canadian Institute for Advanced Research. #12;263 genomes. Our formulation of the Nadeau (possibly inverted) within segments. 2" The Marginal Probability of r-gene Segments In trying to count

  7. Occupational Populations

    E-Print Network [OSTI]

    unknown authors

    ? The general population may be exposed to radon in indoor and outdoor air and drinking water. ? The primary source of indoor radon is from soil; radon in the soil can enter the home through cracks in the floors, walls, or foundations. The release of radon from water may also contribute to indoor levels. ? Exposures to radon gas are accompanied by exposure to radon progeny which are the decay products of radon-222 [e.g., bismuth-214 ( 214 Bi), lead-210 ( 210 Pb), 214 Pb, polonium-210 ( 210 Po), and 218 Po.

  8. Museum: Multidimensional web page segment evaluation model

    E-Print Network [OSTI]

    Kuppusamy, K S

    2012-01-01T23:59:59.000Z

    The evaluation of a web page with respect to a query is a vital task in the web information retrieval domain. This paper proposes the evaluation of a web page as a bottom-up process from the segment level to the page level. A model for evaluating the relevancy is proposed incorporating six different dimensions. An algorithm for evaluating the segments of a web page, using the above mentioned six dimensions is proposed. The benefits of fine-granining the evaluation process to the segment level instead of the page level are explored. The proposed model can be incorporated for various tasks like web page personalization, result re-ranking, mobile device page rendering etc.

  9. Elimination of Glass Artifacts and Object Segmentation

    E-Print Network [OSTI]

    Katyal, Vini; Srivastava, Deepesh

    2012-01-01T23:59:59.000Z

    Many images nowadays are captured from behind the glasses and may have certain stains discrepancy because of glass and must be processed to make differentiation between the glass and objects behind it. This research paper proposes an algorithm to remove the damaged or corrupted part of the image and make it consistent with other part of the image and to segment objects behind the glass. The damaged part is removed using total variation inpainting method and segmentation is done using kmeans clustering, anisotropic diffusion and watershed transformation. The final output is obtained by interpolation. This algorithm can be useful to applications in which some part of the images are corrupted due to data transmission or needs to segment objects from an image for further processing.

  10. analysis identifies distinct: Topics by E-print Network

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

    Engineering Websites Summary: ways to nd patterns shared by real-valued time series as well (Kruskall & Sanko 1983). UnfortunatelyIdentifying Distinctive Subsequences in...

  11. Learning an Interactive Segmentation System Hannes Nickisch

    E-Print Network [OSTI]

    Learning an Interactive Segmentation System Hannes Nickisch MPI for Biological Cybernetics hn@ims.tuwien.ac.at ABSTRACT Many successful applications of computer vision to image or video manipulation are interactive, interactive systems have been treated in the same manner as their fully automatic counterparts

  12. Quality Estimation and Segmentation of Pig Backs

    E-Print Network [OSTI]

    Quality Estimation and Segmentation of Pig Backs Mads Fogtmann Hansen Kongens Lyngby 2005 Master the quality of the pig product "18cm back". It presents the necessary tools for deriving the measures, which are needed to perform a quality estimation. This includes finding the ribs, extracting the 18cm back from

  13. Unsupervised Segmentation for Statistical Machine Translation

    E-Print Network [OSTI]

    Koehn, Philipp

    Unsupervised Segmentation for Statistical Machine Translation Siriwan Sereewattana TH E U N I V E R for statistical machine translation. The approach requires no language- nor domain-specific knowledge whatsoever in principle the statistical framework of machine translation can be ap- plied to any language pair

  14. Robust atlas-based segmentation of highly variable anatomy: left atrium segmentation

    E-Print Network [OSTI]

    Depa, Michal

    Automatic segmentation of the heart’s left atrium offers great benefits for planning and outcome evaluation of atrial ablation procedures. However, the high anatomical variability of the left atrium presents significant ...

  15. Determining soft segment structure-property effects in the enhancement of segmented polyurethane performance

    E-Print Network [OSTI]

    Waletzko, Ryan Scott

    2009-01-01T23:59:59.000Z

    Liquid Crystalline Elastomer (LCE)-inspired segmented polyurethane elastomers possessing widely different extents of ordering were created to mimic the hierarchical structure of the continuous matrix and superior mechanical ...

  16. Genetic and expression analysis of enabled in Drosophila leg segmentation

    E-Print Network [OSTI]

    Ramel, Marie-Christine

    2001-01-01T23:59:59.000Z

    Drosophila leg segmentation is a process which is beginning to be understood. The Notch (N) signaling pathway has been identified as a key regulator of joint formation and segmental growth in Drosophila legs. In this context, four-jointed (fj...

  17. automatic anatomy segmentation: Topics by E-print Network

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

    The aim of this seg- mentation is to divide the brain a pre-segmentation to ex- tract the brain from the head. Then, a second segmentation is done inside Lefvre, Sbastien...

  18. Finding Heavy Distinct Hitters in Data Streams Thomas Locher

    E-Print Network [OSTI]

    of a distributed denial of service (DDoS) attack, where many distinct entities target one or a small number traffic volume, there are certain DDoS attacks, e.g., TCP SYN flooding attacks, that is considerably harder. In this paper, we study the problem of finding all entities whose number of distinct

  19. COMBINATION OF BINARIZATION AND CHARACTER SEGMENTATION USING COLOR INFORMATION

    E-Print Network [OSTI]

    Dupont, Stéphane

    Copernic, 7000 Mons, Belgium Tel: +32 65 37 47 17, Fax: +32 65 37 47 29 ABSTRACT Character segmentation

  20. Recovery of Dynamic PET Regions via Simultaneous Segmentation and Deconvolution

    E-Print Network [OSTI]

    Möller, Torsten

    Recovery of Dynamic PET Regions via Simultaneous Segmentation and Deconvolution Benjamin Smith1 and deconvolution of dynamic PET images. By incorporating the PSF of the imaging system into our segmentation model effect. We show improved segmentation results, and outperform two state-of-the-art dynamic PET

  1. Comparison of Segmentation Algorithms For Fluorescence Microscopy Images of Cells

    E-Print Network [OSTI]

    Bernal, Javier

    - mentation techniques are less accurate than k-means clustering with multiple clusters. Segmentation accuracy fluorescence microscopy; k-means cluster; image segmentation; cell edge; bivariate simi- larity index NUMEROUSComparison of Segmentation Algorithms For Fluorescence Microscopy Images of Cells Alden A. Dima,1

  2. UNSUPERVISED SEGMENTATION FOR AUTOMATIC DETECTION OF BRAIN TUMORS IN MRI

    E-Print Network [OSTI]

    Lefèvre, Sébastien

    a pre-segmentation to ex- tract the brain from the head. Then, a second segmentation is done insideUNSUPERVISED SEGMENTATION FOR AUTOMATIC DETECTION OF BRAIN TUMORS IN MRI A.S. Capelle, O. Alata, C- thod for magnetic resonance images. The aim of this seg- mentation is to divide the brain

  3. The cognitive/sensorimotor distinction or Glover's three-part distinction can be applied to the oculomotor system, as Glover

    E-Print Network [OSTI]

    Jegelka, Stefanie

    The cognitive/sensorimotor distinction or Glover's three-part distinction can be applied to the oculomotor system, as Glover notes. A first step in this analysis is to differentiate planning and control. In this sense we agree with Glover that there are probably differences between the use of information

  4. Segmented nanowires displaying locally controllable properties

    DOE Patents [OSTI]

    Sutter, Eli Anguelova; Sutter, Peter Werner

    2013-03-05T23:59:59.000Z

    Vapor-liquid-solid growth of nanowires is tailored to achieve complex one-dimensional material geometries using phase diagrams determined for nanoscale materials. Segmented one-dimensional nanowires having constant composition display locally variable electronic band structures that are determined by the diameter of the nanowires. The unique electrical and optical properties of the segmented nanowires are exploited to form electronic and optoelectronic devices. Using gold-germanium as a model system, in situ transmission electron microscopy establishes, for nanometer-sized Au--Ge alloy drops at the tips of Ge nanowires (NWs), the parts of the phase diagram that determine their temperature-dependent equilibrium composition. The nanoscale phase diagram is then used to determine the exchange of material between the NW and the drop. The phase diagram for the nanoscale drop deviates significantly from that of the bulk alloy.

  5. Apparatus For Laminating Segmented Core For Electric Machine

    DOE Patents [OSTI]

    Lawrence, Robert Anthony (Kokomo, IN); Stabel, Gerald R (Swartz Creek, MI)

    2003-06-17T23:59:59.000Z

    A segmented core for an electric machine includes segments stamped from coated electric steel. The segments each have a first end, a second end, and winding openings. A predetermined number of segments are placed end-to-end to form layers. The layers are stacked such that each of the layers is staggered from adjacent layers by a predetermined rotation angle. The winding openings of each of the layers are in vertical alignment with the winding openings of the adjacent layers. The stack of layers is secured to form the segmented core.

  6. Segmentation of x-ray images using Probabilistic Relaxation Labeling

    SciTech Connect (OSTI)

    Thai, T.Q.

    1991-01-01T23:59:59.000Z

    Segmentation is a process of separating objects of interest from their background or from other objects in an image. Without a suitable segmentation scheme, it is very difficult to detect contraband in X-rays images. In this paper, a Probabilistic Relaxation Labeling (PRL) segmentation scheme is presented and compared with other segmentation methods. PRL segmentation is an interative algorithm that labels each pixel in an image by cooperative use of two information sources: the pixel probability and the degree of certainty of its probability supported by the neighboring pixels. The practical implementation and results of the PRL segmentation on X-ray baggage images are also discussed and compared with other segmentation methods. 13 refs., 12 figs.

  7. analysis reveal distinct: Topics by E-print Network

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

    maps of the density of the water distinct water models: F3C, TIP3P, TIP4P, SPC, or SPCE. For each solute, five 100 ns data sets, each Raschke, Tanya M. 15 Genome...

  8. analysis reveals distinct: Topics by E-print Network

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

    maps of the density of the water distinct water models: F3C, TIP3P, TIP4P, SPC, or SPCE. For each solute, five 100 ns data sets, each Raschke, Tanya M. 15 Genome...

  9. analyses reveal distinct: Topics by E-print Network

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

    maps of the density of the water distinct water models: F3C, TIP3P, TIP4P, SPC, or SPCE. For each solute, five 100 ns data sets, each Raschke, Tanya M. 16...

  10. Liver segmentation in contrast enhanced CT data using graph cuts and interactive 3D segmentation refinement methods

    SciTech Connect (OSTI)

    Beichel, Reinhard; Bornik, Alexander; Bauer, Christian; Sorantin, Erich [Departments of Electrical and Computer Engineering and Internal Medicine, Iowa Institute for Biomedical Imaging, University of Iowa, Iowa City, Iowa 52242 (United States); Institute for Computer Graphics and Vision, Graz University of Technology, Inffeldgasse 16, A-8010 Graz (Austria); Department of Electrical and Computer Engineering, Iowa Institute for Biomedical Imaging, University of Iowa, Iowa City, Iowa 52242 (United States); Department of Radiology, Medical University Graz, Auenbruggerplatz 34, A-8010 Graz (Austria)

    2012-03-15T23:59:59.000Z

    Purpose: Liver segmentation is an important prerequisite for the assessment of liver cancer treatment options like tumor resection, image-guided radiation therapy (IGRT), radiofrequency ablation, etc. The purpose of this work was to evaluate a new approach for liver segmentation. Methods: A graph cuts segmentation method was combined with a three-dimensional virtual reality based segmentation refinement approach. The developed interactive segmentation system allowed the user to manipulate volume chunks and/or surfaces instead of 2D contours in cross-sectional images (i.e, slice-by-slice). The method was evaluated on twenty routinely acquired portal-phase contrast enhanced multislice computed tomography (CT) data sets. An independent reference was generated by utilizing a currently clinically utilized slice-by-slice segmentation method. After 1 h of introduction to the developed segmentation system, three experts were asked to segment all twenty data sets with the proposed method. Results: Compared to the independent standard, the relative volumetric segmentation overlap error averaged over all three experts and all twenty data sets was 3.74%. Liver segmentation required on average 16 min of user interaction per case. The calculated relative volumetric overlap errors were not found to be significantly different [analysis of variance (ANOVA) test, p = 0.82] between experts who utilized the proposed 3D system. In contrast, the time required by each expert for segmentation was found to be significantly different (ANOVA test, p = 0.0009). Major differences between generated segmentations and independent references were observed in areas were vessels enter or leave the liver and no accepted criteria for defining liver boundaries exist. In comparison, slice-by-slice based generation of the independent standard utilizing a live wire tool took 70.1 min on average. A standard 2D segmentation refinement approach applied to all twenty data sets required on average 38.2 min of user interaction and resulted in statistically not significantly different segmentation error indices (ANOVA test, significance level of 0.05). Conclusions: All three experts were able to produce liver segmentations with low error rates. User interaction time savings of up to 71% compared to a 2D refinement approach demonstrate the utility and potential of our approach. The system offers a range of different tools to manipulate segmentation results, and some users might benefit from a longer learning phase to develop efficient segmentation refinement strategies. The presented approach represents a generally applicable segmentation approach that can be applied to many medical image segmentation problems.

  11. Segmented lasing tube for high temperature laser assembly

    DOE Patents [OSTI]

    Sawicki, Richard H. (Danville, CA); Alger, Terry W. (Tracy, CA); Finucane, Raymond G. (Pleasanton, CA); Hall, Jerome P. (Livermore, CA)

    1996-01-01T23:59:59.000Z

    A high temperature laser assembly capable of withstanding operating temperatures in excess of 1500.degree. C. is described comprising a segmented cylindrical ceramic lasing tube having a plurality of cylindrical ceramic lasing tube segments of the same inner and outer diameters non-rigidly joined together in axial alignment; insulation of uniform thickness surround the walls of the ceramic lasing tube; a ceramic casing, preferably of quartz, surrounding the insulation; and a fluid cooled metal jacket surrounds the ceramic casing. In a preferred embodiment, the inner surface of each of the ceramic lasing tube segments are provided with a pair of oppositely spaced grooves in the wall thereof parallel to the center axis of the segmented cylindrical ceramic lasing tube, and both of the grooves and the center axis of the segmented cylindrical ceramic lasing tube lie in a common plane, with the grooves in each ceramic lasing tube segment in circumferential alignment with the grooves in the adjoining ceramic lasing tube segments; and one or more ceramic plates, all lying in a common plane to one another and with the central axis of the segmented ceramic lasing tube, are received in the grooves to provide additional wall area in the segmented ceramic lasing tube for collision and return to ground state of metastable metal atoms within the segmented ceramic lasing tube.

  12. Financing Program Market Segments | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directed offOCHCO2: FinalOffers New Training on Energy6 FederalofE:Financing Mechanisms forMarket Segments

  13. Cutting assembly including expanding wall segments of auger

    DOE Patents [OSTI]

    Treuhaft, Martin B. (San Antonio, TX); Oser, Michael S. (San Antonio, TX)

    1983-01-01T23:59:59.000Z

    A mining auger comprises a cutting head carried at one end of a tubular shaft and a plurality of wall segments which in a first position thereof are disposed side by side around said shaft and in a second position thereof are disposed oblique to said shaft. A vane projects outwardly from each wall segment. When the wall segments are in their first position, the vanes together form a substantially continuous helical wall. A cutter is mounted on the peripheral edge of each of the vanes. When the wall segments are in their second position, the cutters on the vanes are disposed radially outward from the perimeter of the cutting head.

  14. Microsoft Word - Segment and Value Propositions Draft Task 6...

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

    MUIR DATA SYSTEMS, INC. Wind Industry Segments & CMMS Value Propositions Muir Data Systems Wind Energy Technology Sandia National Laboratories James Parle, Jonathan Gibson, Chad...

  15. Market Segmentation and Energy Efficiency Program Design (2008 CIEE Report)

    Broader source: Energy.gov [DOE]

    This paper describes the existing state of market segmentation among California’s electric utilities, with an emphasis on the investor-owned utilities (IOUs).

  16. anatomy segmentation algorithm: Topics by E-print Network

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

    modeling tool. It can be used to provide a model-based clustering in the field of pattern recognition. However, the application of finite mixtures to image segmentation...

  17. acquired fibular segmental: Topics by E-print Network

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

    Information Sciences Websites Summary: Cortical Enhanced Tissue Segmentation of Neonatal Brain MR Images Acquired by a Dedicated Phased Carolina at Chapel Hill Abstract The...

  18. Shape Invariant Recognition of Segmented Human Faces using Eigenfaces

    E-Print Network [OSTI]

    Cremers, Daniel

    Shape Invariant Recognition of Segmented Human Faces using Eigenfaces Zahid Riaz, Michael Beetz, Bernd Radig Department of Informatics Technical University of Munich, Germany {riaz,beetz

  19. Population Analysis, Fall 2005 1 Population Analyses

    E-Print Network [OSTI]

    Clark, William R.

    Population Analysis, Fall 2005 1 Population Analyses EEOB/AEcl 611 Fall Semester 2005 Scheduled Phone: 294-5176 email: wrclark@iastate.edu AEcl 611 is evolving in response to very rapid changes. The emphasis in AEcl 611 is on understanding the statistical basis of various analytical techniques, applying

  20. Distinct spinon and holon dispersions in photoemission spectral functions from

    E-Print Network [OSTI]

    Loss, Daniel

    ARTICLES Distinct spinon and holon dispersions in photoemission spectral functions from one particles) called spinons and holons. Experimentalists have long sought to verify this effect. Angle quasiparticle peak splits into a spinon­holon two-peak- like structure. Despite extensive ARPES experiments

  1. Pulmonary fissure segmentation on CT Jingbin Wang a

    E-Print Network [OSTI]

    Betke, Margrit

    between the lobes in the lungs. Its segmentation is of clinical interest as it facilitates the assessment of lung disease on a lobar level. This paper describes a new approach for segmenting the major fissures in both lungs on thin-section computed tomography (CT). An image transformation called ``ridge map

  2. Discriminative, Semantic Segmentation of Brain Tissue in MR Images

    E-Print Network [OSTI]

    Soatto, Stefano

    Discriminative, Semantic Segmentation of Brain Tissue in MR Images Zhao Yi1 , Antonio Criminisi2 , Jamie Shotton2 , and Andrew Blake2 1 University of California, Los Angeles, USA. zyi@ucla.edu. 2 is presented for the automatic segmentation and classification of brain tissue from 3D MR scans. It uses

  3. RETINAL BLOOD VESSEL SEGMENTATION USING GEODESIC VOTING METHODS Youssef Rouchdy

    E-Print Network [OSTI]

    Cohen, Laurent

    RETINAL BLOOD VESSEL SEGMENTATION USING GEODESIC VOTING METHODS Youssef Rouchdy and Laurent D to segment retinal blood vessels are presented. Many authors have used minimal cost paths, or similarly on the use of a set of such geodesic paths to extract retinal blood vessels, using minimal interaction

  4. Survey Research Adapting to a Population Increasingly Highly-Segmented, Socially-Disintegrated, and Heavily-

    E-Print Network [OSTI]

    Wolfe, Patrick J.

    a fellow of the American Statistical Association in 1982, elected a member of the International Statistical of Sciences, in 2004. He was the Census Bureau's associate director for Statistical Design, Methodology one of the 50 most influential books in survey research by the American Association of Public Opinion

  5. Engineering mesoscale structures with distinct dynamical implications in networks of delay-coupled delay oscillators

    E-Print Network [OSTI]

    Anne-Ly Do; Johannes Höfener; Thilo Gross

    2012-07-05T23:59:59.000Z

    The dynamics of networks of interacting systems depends intricately on the interaction topology. When the dynamics is explored, generally the whole topology has to be considered. However, we show that there are certain mesoscale subgraphs that have precise and distinct consequences for the system-level dynamics. In particular, if meso-scale symmetries are present then eigenvectors of the Jacobian localise on the symmetric subgraph and the corresponding eigenvalues become insensitive to the topology outside the subgraph. Hence, dynamical instabilities associated with these eigenvalues can be analyzed without considering the topology outside the subgraph. While such instabilities are thus generated entirely in small network subgraphs, they generally do not remain confined to the subgraph once the instability sets in and thus have system-level consequences. Here we illustrate the analytical investigation of such instabilities in an ecological meta-population model consisting of a network of delay-coupled delay oscillators.

  6. The fungus gardens of leaf-cutter ants undergo a distinct physiologica...

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

    fungus gardens of leaf-cutter ants undergo a distinct physiological transition during biomass degradation. The fungus gardens of leaf-cutter ants undergo a distinct physiological...

  7. A Bayesian Approach for Image Segmentation with Shape Priors

    SciTech Connect (OSTI)

    Chang, Hang; Yang, Qing; Parvin, Bahram

    2008-06-20T23:59:59.000Z

    Color and texture have been widely used in image segmentation; however, their performance is often hindered by scene ambiguities, overlapping objects, or missingparts. In this paper, we propose an interactive image segmentation approach with shape prior models within a Bayesian framework. Interactive features, through mouse strokes, reduce ambiguities, and the incorporation of shape priors enhances quality of the segmentation where color and/or texture are not solely adequate. The novelties of our approach are in (i) formulating the segmentation problem in a well-de?ned Bayesian framework with multiple shape priors, (ii) ef?ciently estimating parameters of the Bayesian model, and (iii) multi-object segmentation through user-speci?ed priors. We demonstrate the effectiveness of our method on a set of natural and synthetic images.

  8. acute non-st segment: Topics by E-print Network

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

    Summary: Image segmentation is very essential and critical to image processing and pattern recognition. This survey provides a summary of color image segmentation techniques...

  9. Melt generation, crystallization, and extraction beneath segmented oceanic transform faults

    E-Print Network [OSTI]

    Gregg, Patricia M.

    We examine mantle melting, fractional crystallization, and melt extraction beneath fast slipping, segmented oceanic transform fault systems. Three-dimensional mantle flow and thermal structures are calculated using a ...

  10. Supplementary Material: Segmentation with Area Constraints Marc Niethammera,b

    E-Print Network [OSTI]

    - ators, the ADMM dual energy, and the derivation of the estimate of the relaxed dual energy. Keywords dual energy, and the estimate of the relaxed dual energy respectively. S.1. Full vesicle segmentation

  11. Monitoring transient repolarization segment morphology deviations in mouse ECG

    E-Print Network [OSTI]

    Oefinger, Matthew Blake, 1976-

    2006-01-01T23:59:59.000Z

    This thesis details the design, implementation and validation of a system that facilitates partial automation for detection of anomalous repolarization segment morphologies in the ECG of mice. The technology consists of ...

  12. Sport divers and underwater parks: a market segmentation analysis

    E-Print Network [OSTI]

    Matheusik, Mick Eric

    1983-01-01T23:59:59.000Z

    SPORT DIVERS AND UNDERWATER PARKS: A MARKET SEGMENTATION ANALYSIS A Thesis by MICK ERIC MATHEUSIK Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May... 1983 Major Subject: Recreation and Resources Development SPORT DIVERS AND UNDERWATER PARKS: A MARKET SEGMENTATION ANALYSIS A Thesis by MICK ERIC MATHEUSIK Approved as to style and content by: Allan S. Mills (Chairman of Committee) Clare . unn...

  13. Segmented vs conventional numerals: legibility and long term retention

    E-Print Network [OSTI]

    Hill, Steve Edgar

    1971-01-01T23:59:59.000Z

    SEGMENTED VS CONVENTIONAL NUMERALS: LEGIBILITY AND LONG TERM RETENTION A Thesis by STEVE EDGAR HILL Submitted to the Graduate College of Texas A8cM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... December 1971 Ma]or Subject: Industrial Engineering SEGMENTED VS CONVENTIONAL NUMERALS: LEGIBILITY AND LONG TERM RETENTION A Thesis STEVE EDGAR HILL Approved as to style and content by: Elias Chairman of Committee) r. A. W. ortham (Head...

  14. Distinctive Appliances: Order (2014-CE-23020) | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:Revised Finding of No53197E T ADRAFT ENVIRONMENTALCombustion4-CE-23020) Distinctive

  15. annual statistics 2O12-2013 Distinctly Global

    E-Print Network [OSTI]

    Painter, Kevin

    .Brown@hw.ac.uk Student numbers information is extracted from a `snap-shot' of the student database at a census date population had reached approximately 3,180. The University's International Centre for Island Technology based. The Centre concentrates on renewable energy, particularly marine energy. In November 2011, Heriot

  16. FROM FLAT DIRECT MODELS TO SEGMENTAL CRF MODELS Geoffrey Zweig and Patrick Nguyen

    E-Print Network [OSTI]

    Hunt, Galen

    the SCRF is better suited. Index Terms-- Flat Direct Model, Segmental CRF, Voice Search, Speech Recognition

  17. A Robust Heart Sounds Segmentation Module Based on S-Transform

    E-Print Network [OSTI]

    Boyer, Edmond

    1 A Robust Heart Sounds Segmentation Module Based on S-Transform Ali Moukadem1, 3 , Alain Dieterlen presents a new module for heart sounds segmentation based on S-Transform. The heart sounds segmentation process segments the PhonoCardioGram (PCG) signal into four parts: S1 (first heart sound), systole, S2

  18. Video Object Discovery and Co-segmentation with Extremely Weak Supervision

    E-Print Network [OSTI]

    Cortes, Corinna

    Video Object Discovery and Co-segmentation with Extremely Weak Supervision Le Wang , Gang Hua of Technology Google Research Abstract. Video object co-segmentation refers to the problem of simultaneous- ly segmenting a common category of objects from multiple videos. Most existing video co-segmentation methods

  19. Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites

    SciTech Connect (OSTI)

    Finnigan, Bradley; Halley, Peter; Jack, Kevin; McDowell, Alasdair; Truss, Rowan; Casey, Phil; Knott, Robert; Martin, Darren (Queensland); (CSIRO); (ANSTO)

    2008-04-02T23:59:59.000Z

    Two organically modified layered silicates (with small and large diameters) were incorporated into three segmented polyurethanes with various degrees of microphase separation. Microphase separation increased with the molecular weight of the poly(hexamethylene oxide) soft segment. The molecular weight of the soft segment did not influence the amount of polyurethane intercalating the interlayer spacing. Small-angle neutron scattering and differential scanning calorimetry data indicated that the layered silicates did not affect the microphase morphology of any host polymer, regardless of the particle diameter. The stiffness enhancement on filler addition increased as the microphase separation of the polyurethane decreased, presumably because a greater number of urethane linkages were available to interact with the filler. For comparison, the small nanofiller was introduced into a polyurethane with a poly(tetramethylene oxide) soft segment, and a significant increase in the tensile strength and a sharper upturn in the stress-strain curve resulted. No such improvement occurred in the host polymers with poly(hexamethylene oxide) soft segments. It is proposed that the nanocomposite containing the more hydrophilic and mobile poly(tetramethylene oxide) soft segment is capable of greater secondary bonding between the polyurethane chains and the organosilicate surface, resulting in improved stress transfer to the filler and reduced molecular slippage.

  20. Different Vaccine Vectors Delivering the Same Antigen Elicit CD8plus T Cell Responses with Distinct Clonotype and Epitope Specificity

    SciTech Connect (OSTI)

    M Honda; R Wang; W Kong; M Kanekiyo; Q Akahata; L Xu; K Matsuo; K Natarajan; H Robinson; et al.

    2011-12-31T23:59:59.000Z

    Prime-boost immunization with gene-based vectors has been developed to generate more effective vaccines for AIDS, malaria, and tuberculosis. Although these vectors elicit potent T cell responses, the mechanisms by which they stimulate immunity are not well understood. In this study, we show that immunization by a single gene product, HIV-1 envelope, with alternative vector combinations elicits CD8{sup +} cells with different fine specificities and kinetics of mobilization. Vaccine-induced CD8{sup +} T cells recognized overlapping third V region loop peptides. Unexpectedly, two anchor variants bound H-2D{sup d} better than the native sequences, and clones with distinct specificities were elicited by alternative vectors. X-ray crystallography revealed major differences in solvent exposure of MHC-bound peptide epitopes, suggesting that processed HIV-1 envelope gave rise to MHC-I/peptide conformations recognized by distinct CD8{sup +} T cell populations. These findings suggest that different gene-based vectors generate peptides with alternative conformations within MHC-I that elicit distinct T cell responses after vaccination.

  1. Different Vaccine Vectors Delivering the Same Antigen Elicit CD8+ T Cell Responses with Distinct Clonotype and Epitope Specificity

    SciTech Connect (OSTI)

    Honda, M.; Robinson, H.; Wang, R.; Kong, W.-P.; Kanekiyo, M.; Akahata, W.; Xu, L.; Matsuo, K.; Natarajan, K.; Asher, T. E.; Price, D. A.; Douek, D. C.; Margulies, D. H.; Nabel, G. J.

    2009-08-15T23:59:59.000Z

    Prime-boost immunization with gene-based vectors has been developed to generate more effective vaccines for AIDS, malaria, and tuberculosis. Although these vectors elicit potent T cell responses, the mechanisms by which they stimulate immunity are not well understood. In this study, we show that immunization by a single gene product, HIV-1 envelope, with alternative vector combinations elicits CD8{sup +} cells with different fine specificities and kinetics of mobilization. Vaccine-induced CD8{sup +} T cells recognized overlapping third V region loop peptides. Unexpectedly, two anchor variants bound H-2D{sup d} better than the native sequences, and clones with distinct specificities were elicited by alternative vectors. X-ray crystallography revealed major differences in solvent exposure of MHC-bound peptide epitopes, suggesting that processed HIV-1 envelope gave rise to MHC-I/peptide conformations recognized by distinct CD8{sup +} T cell populations. These findings suggest that different gene-based vectors generate peptides with alternative conformations within MHC-I that elicit distinct T cell responses after vaccination.

  2. The Social Brain; An Investigation into Total Social Network Size and Relationship Closeness within a Distinct Human Population

    E-Print Network [OSTI]

    Brown, Philippa

    2008-06-27T23:59:59.000Z

    ) ‘social intelligence’ (emergent from ‘general intelligence’) was found to correlate with total social network size in humans: (r = .225, p networks size was established (r...

  3. The Distinct Element Method - Application to Structures in Jointed Rock

    SciTech Connect (OSTI)

    Morris, J.P.; Glen, L.; Blair, S.; Heuze, F.

    2001-11-30T23:59:59.000Z

    The Distinct Element Method (DEM) is a meshfree method with applications to rock mechanics, mining sciences, simulations of nuclear repositories, and the stability of underground structures. Continuum mesh-based methods have been applied successfully to many problems in geophysics. Even if the geology includes fractures and faults, when sufficiently large length scales are considered a continuum approximation may be sufficient. However, a large class of problems exist where individual rock joints must be taken into account. This includes problems where the structures of interest have sizes comparable with the block size. In addition, it is possible that while the structure may experience loads which do no measurable damage to individual blocks, some joints may fail. This may launch smaller blocks as dangerous projectiles or even cause total failure of a tunnel. Traditional grid-based continuum approaches are wholly unsuited to this class of problem. It is possible to introduce discontinuities or slide lines into existing grid-based methods, however, such limited approaches can break down when new contacts form between blocks. The distinct element method (DEM) is an alternative, meshfree approach. The DEM can directly approximate the block structure of the jointed rock using arbitrary polyhedra. Using this approach, preexisting joints are readily incorporated into the DEM model. In addition, the method detects all new contacts between blocks resulting from relative block motion. We will describe the background of the DEM and review previous application of the DEM to geophysical problems. Finally we present preliminary results from a investigation into the stability of underground structures subjected to dynamic loading.

  4. Image segmentation by hierarchial agglomeration of polygons using ecological statistics

    DOE Patents [OSTI]

    Prasad, Lakshman; Swaminarayan, Sriram

    2013-04-23T23:59:59.000Z

    A method for rapid hierarchical image segmentation based on perceptually driven contour completion and scene statistics is disclosed. The method begins with an initial fine-scale segmentation of an image, such as obtained by perceptual completion of partial contours into polygonal regions using region-contour correspondences established by Delaunay triangulation of edge pixels as implemented in VISTA. The resulting polygons are analyzed with respect to their size and color/intensity distributions and the structural properties of their boundaries. Statistical estimates of granularity of size, similarity of color, texture, and saliency of intervening boundaries are computed and formulated into logical (Boolean) predicates. The combined satisfiability of these Boolean predicates by a pair of adjacent polygons at a given segmentation level qualifies them for merging into a larger polygon representing a coarser, larger-scale feature of the pixel image and collectively obtains the next level of polygonal segments in a hierarchy of fine-to-coarse segmentations. The iterative application of this process precipitates textured regions as polygons with highly convolved boundaries and helps distinguish them from objects which typically have more regular boundaries. The method yields a multiscale decomposition of an image into constituent features that enjoy a hierarchical relationship with features at finer and coarser scales. This provides a traversable graph structure from which feature content and context in terms of other features can be derived, aiding in automated image understanding tasks. The method disclosed is highly efficient and can be used to decompose and analyze large images.

  5. SciTech Connect: A Distinct MaoC-like Enoyl-CoA Hydratase Architecture...

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

    A Distinct MaoC-like Enoyl-CoA Hydratase Architecture Mediates Cholesterol Catabolism in Mycobacterium tuberculosis Citation Details In-Document Search Title: A Distinct MaoC-like...

  6. Pulmonary Vascular Tree Segmentation from Contrast-Enhanced CT Images

    E-Print Network [OSTI]

    Helmberger, M; Pienn, M; Balint, Z; Olschewski, A; Bischof, H

    2013-01-01T23:59:59.000Z

    We present a pulmonary vessel segmentation algorithm, which is fast, fully automatic and robust. It uses a coarse segmentation of the airway tree and a left and right lung labeled volume to restrict a vessel enhancement filter, based on an offset medialness function, to the lungs. We show the application of our algorithm on contrast-enhanced CT images, where we derive a clinical parameter to detect pulmonary hypertension (PH) in patients. Results on a dataset of 24 patients show that quantitative indices derived from the segmentation are applicable to distinguish patients with and without PH. Further work-in-progress results are shown on the VESSEL12 challenge dataset, which is composed of non-contrast-enhanced scans, where we range in the midfield of participating contestants.

  7. Self-organization and segmentation with laterally connected spiking neurons

    E-Print Network [OSTI]

    1997-01-01T23:59:59.000Z

    A self-organizing model of spiking neurons with dynamic thresholds and lateral excitatory and inhibitory connections is presented and tested in the image segmentation task. The model integrates two previously separate lines of research in modeling the visual cortex. Laterally connected self-organizing maps have been used to model how afferent structures and lateral connections could self-organize through inputdriven Hebbian adaptation. Spiking neurons with leaky integrator synapses have been used to model image segmentation and binding by synchronization and desynchronization of neuronal activity. Although these approaches differ in how they model the neuron, they have the same overall layout of a laterally connected two-dimensional network. This paper shows how both self-organization and segmentation can be achieved in such a network, thus presenting a unified model of development and functional dynamics in the primary visual cortex. 1

  8. Technical Safety Requirements for the B695 Segment

    SciTech Connect (OSTI)

    Laycak, D

    2008-09-11T23:59:59.000Z

    This document contains Technical Safety Requirements (TSRs) for the Radioactive and Hazardous Waste Management (RHWM) Division's B695 Segment of the Decontamination and Waste Treatment Facility (DWTF) at Lawrence Livermore National Laboratory (LLNL). The TSRs constitute requirements regarding the safe operation of the B695 Segment. The TSRs are derived from the Documented Safety Analysis (DSA) for the B695 Segment (LLNL 2007). The analysis presented there determined that the B695 Segment is a low-chemical hazard, Hazard Category 3, nonreactor nuclear facility. The TSRs consist primarily of inventory limits as well as controls to preserve the underlying assumptions in the hazard analyses. Furthermore, appropriate commitments to safety programs are presented in the administrative controls section of the TSRs. The B695 Segment (B695 and the west portion of B696) is a waste treatment and storage facility located in the northeast quadrant of the LLNL main site. The approximate area and boundary of the B695 Segment are shown in the B695 Segment DSA. Activities typically conducted in the B695 Segment include container storage, lab-packing, repacking, overpacking, bulking, sampling, waste transfer, and waste treatment. B695 is used to store and treat radioactive, mixed, and hazardous waste, and it also contains equipment used in conjunction with waste processing operations to treat various liquid and solid wastes. The portion of the building called Building 696 Solid Waste Processing Area (SWPA), also referred to as B696S in this report, is used primarily to manage solid radioactive, mixed, and hazardous waste. Operations specific to the SWPA include sorting and segregating waste, lab-packing, sampling, and crushing empty drums that previously contained waste. Furthermore, a Waste Packaging Unit will be permitted to treat hazardous and mixed waste. RHWM generally processes LLW with no, or extremely low, concentrations of transuranics (i.e., much less than 100 nCi/g). Wastes processed often contain only depleted uranium and beta- and gamma-emitting nuclides, e.g., {sup 90}Sr, {sup 137}Cs, {sup 3}H. Chapter 5 of the DSA documents the derivation of TSRs and develops the operational limits that protect the safety envelope defined for this facility. The DSA is applicable to the handling of radioactive waste stored and treated in the B695 Segment. Section 5 of the TSR, Administrative Controls, contains those Administrative Controls necessary to ensure safe operation of the B695 Segment. A basis explanation for each of the requirements described in Section 5.5, Specific Administrative Controls is provided in Appendix B. The basis explanation does not constitute an additional requirement, but is intended as an expansion of the logic and reasoning behind development of the requirement. Programmatic Administrative Controls are addressed in Section 5.6. This introduction to the B695 Segment TSRs is not part of the TSR limits or conditions and contains no requirements related to B695 Segment operations or to the safety analyses in the DSA.

  9. Engineering interactions for quasiperfect transfer of polariton states through nonideal bosonic networks of distinct topologies

    SciTech Connect (OSTI)

    Moraes Neto, G. D. de; Moussa, M. H. Y. [Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Caixa Postal 369, 13560-590 Sao Carlos, SP (Brazil); Ponte, M. A. de [Departamento de Fisica, Universidade Regional do Cariri, 63010-970 Juazeiro do Norte, CE (Brazil)

    2011-09-15T23:59:59.000Z

    We present a scheme for quasiperfect transfer of polariton states from a sender to a spatially separated receiver, both composed of high-quality cavities filled by atomic samples. The sender and the receiver are connected by a nonideal transmission channel --the data bus-- modelled by a network of lossy empty cavities. In particular, we analyze the influence of a large class of data-bus topologies on the fidelity and transfer time of the polariton state. Moreover, we also assume dispersive couplings between the polariton fields and the data-bus normal modes in order to achieve a tunneling-like state transfer. Such a tunneling-transfer mechanism, by which the excitation energy of the polariton effectively does not populate the data-bus cavities, is capable of attenuating appreciably the dissipative effects of the data-bus cavities. After deriving a Hamiltonian for the effective coupling between the sender and the receiver, we show that the decay rate of the fidelity is proportional to a cooperativity parameter that weighs the cost of the dissipation rate against the benefit of the effective coupling strength. The increase of the fidelity of the transfer process can be achieved at the expense of longer transfer times. We also show that the dependence of both the fidelity and the transfer time on the network topology is analyzed in detail for distinct regimes of parameters. It follows that the data-bus topology can be explored to control the time of the state-transfer process.

  10. Documented Safety Analysis for the B695 Segment

    SciTech Connect (OSTI)

    Laycak, D

    2008-09-11T23:59:59.000Z

    This Documented Safety Analysis (DSA) was prepared for the Lawrence Livermore National Laboratory (LLNL) Building 695 (B695) Segment of the Decontamination and Waste Treatment Facility (DWTF). The report provides comprehensive information on design and operations, including safety programs and safety structures, systems and components to address the potential process-related hazards, natural phenomena, and external hazards that can affect the public, facility workers, and the environment. Consideration is given to all modes of operation, including the potential for both equipment failure and human error. The facilities known collectively as the DWTF are used by LLNL's Radioactive and Hazardous Waste Management (RHWM) Division to store and treat regulated wastes generated at LLNL. RHWM generally processes low-level radioactive waste with no, or extremely low, concentrations of transuranics (e.g., much less than 100 nCi/g). Wastes processed often contain only depleted uranium and beta- and gamma-emitting nuclides, e.g., {sup 90}Sr, {sup 137}Cs, or {sup 3}H. The mission of the B695 Segment centers on container storage, lab-packing, repacking, overpacking, bulking, sampling, waste transfer, and waste treatment. The B695 Segment is used for storage of radioactive waste (including transuranic and low-level), hazardous, nonhazardous, mixed, and other waste. Storage of hazardous and mixed waste in B695 Segment facilities is in compliance with the Resource Conservation and Recovery Act (RCRA). LLNL is operated by the Lawrence Livermore National Security, LLC, for the Department of Energy (DOE). The B695 Segment is operated by the RHWM Division of LLNL. Many operations in the B695 Segment are performed under a Resource Conservation and Recovery Act (RCRA) operation plan, similar to commercial treatment operations with best demonstrated available technologies. The buildings of the B695 Segment were designed and built considering such operations, using proven building systems, and keeping them as simple as possible while complying with industry standards and institutional requirements. No operations to be performed in the B695 Segment or building system are considered to be complex. No anticipated future change in the facility mission is expected to impact the extent of safety analysis documented in this DSA.

  11. Decoupling of Ionic Trasport from Segmental Relaxation in Polymer Electrolytes

    SciTech Connect (OSTI)

    Wang, Yangyang [ORNL; Agapov, Alexander L [ORNL; Fan, Fei [ORNL; Hong, Kunlun [ORNL; Yu, Xiang [ORNL; Mays, Jimmy [ORNL; Sokolov, Alexei P [ORNL

    2012-01-01T23:59:59.000Z

    We present detailed studies of the relationship between ionic conductivity and segmental relaxation in polymer electrolytes. The analysis shows that the ionic conductivity can be decoupled from segmental dynamics and the strength of the decoupling correlates with the fragility but not with the glass transition temperature. These results call for a revision of the current picture of ionic transport in polymer electrolytes. We relate the observed decoupling phenomenon to frustration in packing of rigid polymers, where the loose local structure is also responsible for the increase in their fragility.

  12. Segmentation Conditional Random Fields (SCRFs): A New Approach for

    E-Print Network [OSTI]

    Carbonell, Jaime

    Segmentation Conditional Random Fields (SCRFs): A New Approach for Protein Fold Recognition Yan Liu, University of Pittsburgh, PA, USA vanathi@cbmi.pitt.edu Abstract. Protein fold recognition is an important.e. the supersecondary structures or protein folds. There has been significant work on predicting some well-defined types

  13. Brain Mapping Using Topology Graphs Obtained by Surface Segmentation

    E-Print Network [OSTI]

    Linsen, Lars

    Brain Mapping Using Topology Graphs Obtained by Surface Segmentation Fabien Vivodtzev1 , Lars@ucdavis.edu Summary. Brain mapping is a technique used to alleviate the tedious and time- consuming process of annotating brains by mapping existing annotations from brain atlases to individual brains. We introduce

  14. BEaST: Brain extraction using multiresolution nonlocal segmentation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    BEaST: Brain extraction using multiresolution nonlocal segmentation Simon F. Eskildsen1 Østergaard2 , D. Louis Collins1 , and the Alzheimer's Disease Neuroimaging Initiative 1 McConnell Brain. Brain extraction is an important step in the analysis of brain images. Variability in brain morphology

  15. Method of making segmented pyrolytic graphite sputtering targets

    DOE Patents [OSTI]

    McKernan, M.A.; Alford, C.S.; Makowiecki, D.M.; Chen, C.W.

    1994-02-08T23:59:59.000Z

    Anisotropic pyrolytic graphite wafers are oriented and bonded together such that the graphite's high thermal conductivity planes are maximized along the back surface of the segmented pyrolytic graphite target to allow for optimum heat conduction away from the sputter target's sputtering surface and to allow for maximum energy transmission from the target's sputtering surface. 2 figures.

  16. MODEL BUILDING FOR INTERACTIVE SEGMENTATION OF THE FEMORAL HEAD

    E-Print Network [OSTI]

    McKenzie, Rick

    MODEL BUILDING FOR INTERACTIVE SEGMENTATION OF THE FEMORAL HEAD G ZSEMLYE 1 , G SZÉKELY 1 1 by the user. Our first #12;study concentrates on the femoral head, containing only two well defined point the femoral neck at its smallest perimeter with a circle and the femoral head with a half-sphere. After

  17. Pearling: Stroke segmentation with crusted pearl strings , J. Rossignac1

    E-Print Network [OSTI]

    Rossignac, Jarek

    Center, Atlanta, GA 30332 brian.whited@gatech.edu, jarek@cc.gatech.edu 2 Siemens Corporate Research, Intelligent Vision and Reasoning Department, Princeton, NJ 08540 {greg.slabaugh, tong.fang, gozde.unal}@siemens axis transform of a desired portion of the stroke graph. No prior segmentation or thresholding

  18. Active Shape Models & Segmentation of the Left Ventricle in Echocardiography

    E-Print Network [OSTI]

    Paragios, Nikos

    NATIONALE DES PONTS ET CHAUSSEES, Champs sur Marne, France 2 Imaging and Visualization Department, SIEMENS transformation that projects this model to the desired image fea- tures. During the second step, a linear segmentation Research was carried out during the affiliation of the author with Siemens Corporate Research from

  19. The Segmentation of Sparse MR Images Patrick Craig Marais

    E-Print Network [OSTI]

    Marais, Patrick

    The Segmentation of Sparse MR Images Patrick Craig Marais A thesis submitted to the Department of Sparse MR Images Patrick C. Marais A thesis submitted for the degree of Doctor of Philosophy ``sparse'' MR images. Sparse images were acquired in large numbers prior to the emergence of high

  20. Red Blood Cell Segmentation from SEM Images Joost Vromen

    E-Print Network [OSTI]

    McCane, Brendan

    Red Blood Cell Segmentation from SEM Images Joost Vromen Human Media Interaction University Microscope image of red blood cells. We use a second order polynomial model and a simple Bayesian approach sample images involving more than 11000 red blood cells. I. INTRODUCTION There is considerable evidence

  1. Head Knowledge: Summary (Segment from the Tin Shed essay)

    E-Print Network [OSTI]

    O'Laughlin, Jay

    Head Knowledge: Summary (Segment from the Tin Shed essay) While certainly much more nuanced than would declare that it's to be discovered outside Tin Shed, viewed from the wooden bench. Reality of reliability and validity (Frey 1994:95-104). While traveling outside the Tin Shed, systematic analysis

  2. BAYESIAN METHOD FOR SEGMENTATION OF SAR IMAGES IN ROUGH TERRAIN

    E-Print Network [OSTI]

    Oldenburg, Carl von Ossietzky Universität

    BAYESIAN METHOD FOR SEGMENTATION OF SAR IMAGES IN ROUGH TERRAIN Marco Caparrini1 , Klaus Seidel1 are the basis for radiometric correction. Considering SAR images, the huge amount of processing for geographic and geometric calibration and registration that is needed prior to analysis is well established. Nonetheless

  3. Mesoscale analysis of segmental dynamics in microphase-segregated polyurea

    E-Print Network [OSTI]

    Grujicic, Mica

    Mesoscale analysis of segmental dynamics in microphase- segregated polyurea M. Grujicic · B-atom molecular dynamics techniques. To overcome this problem, mesoscale coarse-grain simulation methods of constituent atom-size particles. Within the mesoscale methods, on the other hand, this atomistic description

  4. Beta-measure for Probabilistic Segmentation Oscar Dalmau1

    E-Print Network [OSTI]

    Rivera, Mariano

    Beta-measure for Probabilistic Segmentation Oscar Dalmau1 and Mariano Rivera1 Centro de Investigaci field models (QMMF). In our proposal, the entropy control is achieved trough the likelihood energy = D(x; y) + R(x), (2) s.t. k xk(r) = 1, xk(r) 0, r L, (3) where D(x; y) is the likelihood energy, R

  5. Temporal Segmentation of Egocentric Videos Yair Poleg Chetan Arora

    E-Print Network [OSTI]

    Peleg, Shmuel

    Temporal Segmentation of Egocentric Videos Yair Poleg Chetan Arora Shmuel Peleg The Hebrew life logging egocentric videos. Browsing such long unstruc- tured videos is time consuming and tedious videos, enabling ef- ficient browsing, indexing and summarization of the long videos. Two sources

  6. Channel Access over Path Segments for Ultra Low Latency MANETs

    E-Print Network [OSTI]

    Ramanathan, Ram

    ranges foretell MANETs with very large diameters. Indeed, an architecture where dense low-cost relays Cambridge, MA 02138 Email: ramanath@bbn.com Fabrice Tchakountio BBN Technologies Cambridge, MA 02138 Email and CTS frames that acquire the access rights for an entire segment toward the destination, with virtual

  7. Segmentation for Medical Image Mining: A Technical Ashraf Elsayed1

    E-Print Network [OSTI]

    Atkinson, Katie

    Segmentation for Medical Image Mining: A Technical Report Ashraf Elsayed1 , Frans Coenen1 , Marta, such as relational databases, has been the focal point of much work in data mining. However, with advances, sound, etc). There is currently a very substantial collection of image data that can be mined

  8. VARIATIONAL APPROACH FOR SEGMENTATION OF LUNG NODULES Amal A. Faraga

    E-Print Network [OSTI]

    Louisville, University of

    VARIATIONAL APPROACH FOR SEGMENTATION OF LUNG NODULES Amal A. Faraga , Hossam Abdelmunimab , James, Louisville, Kentucky g University of Louisville, Department of Radiology ABSTRACT Lung nodules from low dose CT (LDCT) scans may be used for early detection of lung cancer. However, these nodules vary in size

  9. Population Ecology Philip M. Dixon

    E-Print Network [OSTI]

    Population Ecology Philip M. Dixon Department of Statistics Iowa State University 20 December 2001 Population ecology is the discipline in ecology that deals with the structure and dynamics (e.g. growth interacting populations. Population ecology is closely related to other ecological disciplines, e

  10. PEO-containing copolymers as polyurethane soft segments in the development of high performance materials

    E-Print Network [OSTI]

    James-Korley, LaShanda Teresa

    2005-01-01T23:59:59.000Z

    Silk-inspired segmented polyurethanes containing flexible, hydrophilic segments with crystalline and liquid crystalline moieties were developed to mimic the hierarchical morphology of the continuous domain in and the ...

  11. atlas-based automatic segmentation: Topics by E-print Network

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

    The aim of this seg- mentation is to divide the brain a pre-segmentation to ex- tract the brain from the head. Then, a second segmentation is done inside Lefvre, Sbastien...

  12. COMPARATIVE STUDY OF POPULATIONS

    E-Print Network [OSTI]

    WOODS HOLE, MASS. SPECIAL SCIENTIFIC REPORT- FISHERIES No. 204 UNITED STATES DEPARTMENT OF THE INTERIOR OF POPULATIONS OF THE STRIPED BASS By Robert Minturn Lewis Fishery Research Biologist Special Scientific Report by Merriman (1937 and 1941), Vladykov and Wal- lace (1952), Raney and de Sylva (1953), Raney, Woolcott

  13. 862 PHYTOPATHOLOGY Population Biology

    E-Print Network [OSTI]

    McDonald, Bruce

    de Agronomía, Universidad Nacional de Colombia, Carrera 30 45-00 Bogotá, Colombia; second author potato in Colombia using 11 simple-sequence repeat (SSR) markers. In total, 288 different multilocus%. RST statistics indicated a very low level of population differentiation overall, consistent with high

  14. HYBRID SPEAKER-BASED SEGMENTATION SYSTEM USING MODEL-LEVEL Hyoung-Gook Kim, Daniel Ertelt, Thomas Sikora

    E-Print Network [OSTI]

    Wichmann, Felix

    -based and model-based segmentation. Figure 1 depicts the algorithm flow chart. The hybrid segmentation can speaker models. First, silence segments in the input audio recording are detected by the simple energy

  15. THE POPULATION OF HELIUM-MERGER PROGENITORS: OBSERVATIONAL PREDICTIONS

    SciTech Connect (OSTI)

    Fryer, Chris L. [CCS Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)] [CCS Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Belczynski, Krzysztof; Bulik, Tomasz [Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw (Poland)] [Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw (Poland); Berger, Edo [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)] [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Thoene, Christina [IAA-CSIC, Glorieta de la Astronomia s/n, E-18008 Granada (Spain)] [IAA-CSIC, Glorieta de la Astronomia s/n, E-18008 Granada (Spain); Ellinger, Carola [Department of Physics, University of Texas at Arlington, 502 Yates Street, Box 19059, Arlington, TX 76019 (United States)] [Department of Physics, University of Texas at Arlington, 502 Yates Street, Box 19059, Arlington, TX 76019 (United States)

    2013-02-20T23:59:59.000Z

    The helium-merger gamma-ray burst (GRB) progenitor is produced by the rapid accretion onto a compact remnant (neutron star or black hole) when it undergoes a common envelope inspiral with its companion's helium core. This merger phase produces a very distinct environment around these outbursts and recent observations suggest that, in some cases, we are detecting the signatures of the past merger in the GRB afterglow. These observations allow us, for the first time, to study the specific features of the helium-merger progenitor. In this paper, we couple population synthesis calculations to our current understanding of GRB engines and common envelope evolution to make observational predictions for the helium-merger GRB population. Many mergers do not produce GRB outbursts and we discuss the implications of these mergers with the broader population of astrophysical transients.

  16. Segmenting the Papillary Muscles and the Trabeculae from High Resolution Cardiac CT

    E-Print Network [OSTI]

    Chen, Kuang-Yu

    to automatically segment the four chambers of the heart in four seconds. Ecabert et al. [5] presented a learning

  17. Delineating Individual Trees from Lidar Data: A Comparison of Vector- and Raster-based Segmentation Approaches

    E-Print Network [OSTI]

    Kelly, Maggi

    2013-01-01T23:59:59.000Z

    Germany, 2012. 44. Baatz, M. ; Hoffmann, C. ; Willhauck, G.interest were segmented. Baatz, Hoffmann and Willhauck [44

  18. The Paradox of the Primary-Secondary Quality Distinction and Husserl's Genealogy of the Mathematization of Nature

    E-Print Network [OSTI]

    Durt, Christoph

    2012-01-01T23:59:59.000Z

    Distinction and Husserl’s Genealogy of the MathematizationDistinction and Husserl’s Genealogy of the Mathematizationof meaning. Husserl’s genealogy of the mathematization

  19. SEGMENTING A BEATING HEART USING POLYSEGMENT AND SPATIAL GPCA Avinash Ravichandran 1

    E-Print Network [OSTI]

    Vidal, René

    SEGMENTING A BEATING HEART USING POLYSEGMENT AND SPATIAL GPCA Avinash Ravichandran 1 , Ren´e Vidal the prob- lem of segmenting the heart based on intensity and dynamics. We first segment the heart Polysegment. As the heart and the chest exhibit differ- ent dynamics, we model the image temporal evolution

  20. A Learning Approach for Adaptive Image Segmentation Vincent Martin, Nicolas Maillot and Monique Thonnat

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Learning Approach for Adaptive Image Segmentation Vincent Martin, Nicolas Maillot and Monique, France {vincent.r.martin,nicolas.maillot,monique.thonnat}@sophia.inria.fr Abstract As mentioned in many. The major contribution is twofold: segmentation is adapted to the image to segment, and in the same time

  1. Fast 3D Brain Segmentation Using Dual-Front Active Contours with Optional User-Interaction

    E-Print Network [OSTI]

    Cohen, Laurent

    Fast 3D Brain Segmentation Using Dual-Front Active Contours with Optional User-Interaction Hua Li1 attributes of 3D brain segmentation algorithms in- clude robustness, accuracy, computational efficiency result. We propose a novel 3D brain cortex segmentation procedure utilizing dual- front active contours

  2. Color Image Segmentation Using Rival Penalized Controlled Competitive Learning Lap-tak Law

    E-Print Network [OSTI]

    Cheung, Yiu-ming

    on color image segmentation in comparison with the k-means and RPCL algorithms. I. INTRODUCTION Color image of applications such as pattern recognition, image compression and matching. In the literature, conventional k-means segmentation approach is pixel-based segmentation, in which the conventional k- means clustering algorithm [3

  3. Difficulties of T1 brain MRI segmentation techniques M S. Atkins*a

    E-Print Network [OSTI]

    Orchard, Jeffery J.

    : brain segmentation, T1-head MRI, IBSR data 1. INTRODUCTION We are interested in segmenting the brain in T1-weighted head scans to find the perimeter of the brain cortex, which is useful for functional MRI , is an automatic brain segmentation algorithm for MRI head scans. In the algorithm, a lower intensity threshold, t2

  4. Video Object Segmentation through Spatially Accurate and Temporally Dense Extraction of Primary Object Regions

    E-Print Network [OSTI]

    Wu, Shin-Tson

    Video Object Segmentation through Spatially Accurate and Temporally Dense Extraction of Primary primary object segments in videos in the `object proposal' domain. The extracted primary object regions are then used to build object models for optimized video segmentation. The proposed approach has several

  5. HEART SEGMENTATION WITH AN ITERATIVE CHAN-VESE OLIVIER ROUSSEAU, YVES BOURGAULT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    HEART SEGMENTATION WITH AN ITERATIVE CHAN-VESE ALGORITHM OLIVIER ROUSSEAU, YVES BOURGAULT Abstract. This paper presents 2D and 3D applications of the Chan-Vese model to heart and trachea segmentation. We is to segment the heart muscle from high resolution CT scans of the thorax and to produce meshes

  6. ROBUST SEGMENTATION OF LUNG TISSUE IN CHEST CT SCANNING Amal Farag, James Graham and Aly Farag

    E-Print Network [OSTI]

    Louisville, University of

    ROBUST SEGMENTATION OF LUNG TISSUE IN CHEST CT SCANNING Amal Farag, James Graham and Aly Farag.edu ABSTRACT This paper deals with segmentation of the lung tissues from low dose CT (LDCT) scans of the chest. Goal is correct segmentation as well as maintaining the details of the lung region in the chest cavity

  7. Automated segmentation of lungs with severe interstitial lung disease in CT

    E-Print Network [OSTI]

    Automated segmentation of lungs with severe interstitial lung disease in CT Jiahui Wang Department: Accurate segmentation of lungs with severe interstitial lung disease ILD in thoracic computed tomography CT developed in this study a texture analysis-based method for accurate segmentation of lungs with severe ILD

  8. Automated Lung Nodule Segmentation Using Dynamic Programming and EM Based Classification

    E-Print Network [OSTI]

    Ahuja, Narendra

    Automated Lung Nodule Segmentation Using Dynamic Programming and EM Based Classification Ning Xua a robust and automated algorithm to segment lung nodules in three dimensional (3D) Computed Tomography (CT nodules but also the nodules attached to lung walls and vessels. Keywords: Lung nodule, Segmentation

  9. Appeared in: IEEE Visualization 2003 Hybrid Segmentation and Exploration of the Human Lungs

    E-Print Network [OSTI]

    Bartz, Dirk

    Appeared in: IEEE Visualization 2003 Hybrid Segmentation and Exploration of the Human Lungs Dirk on a PC with a P3 @ 850 MHz. Abstract Segmentation of the tracheo-bronchial tree of the lungs is notori, the complementary vascular tree of the lungs can be segmented. Furthermore, we modified our virtual endoscopy system

  10. Multi-region unstructured volume segmentation using tetrahedron filling

    SciTech Connect (OSTI)

    Willliams, Sean Jamerson [Los Alamos National Laboratory; Dillard, Scott E [Los Alamos National Laboratory; Thoma, Dan J [MDI, INSTITUTES; Hlawitschka, Mario [UC DAVIS; Hamann, Bernd [UC DAVIS

    2010-01-01T23:59:59.000Z

    Segmentation is one of the most common operations in image processing, and while there are several solutions already present in the literature, they each have their own benefits and drawbacks that make them well-suited for some types of data and not for others. We focus on the problem of breaking an image into multiple regions in a single segmentation pass, while supporting both voxel and scattered point data. To solve this problem, we begin with a set of potential boundary points and use a Delaunay triangulation to complete the boundaries. We use heuristic- and interaction-driven Voronoi clustering to find reasonable groupings of tetrahedra. Apart from the computation of the Delaunay triangulation, our algorithm has linear time complexity with respect to the number of tetrahedra.

  11. Segmented saddle-shaped passive stabilization conductors for toroidal plasmas

    DOE Patents [OSTI]

    Leuer, J.A.

    1990-05-01T23:59:59.000Z

    A large toroidal vacuum chamber for plasma generation and confinement is lined with a toroidal blanket for shielding using modules segmented in the toroidal direction. To provide passive stabilization in the same manner as a conductive vacuum chamber wall, saddle-shaped conductor loops are provided on blanket modules centered on a midplane of the toroidal chamber with horizontal conductive bars above and below the midplane, and vertical conductive legs on opposite sides of each module to provide return current paths between the upper and lower horizontal conductive bars. The close proximity of the vertical legs provided on adjacent modules without making physical contact cancel the electromagnetic field of adjacent vertical legs. The conductive bars spaced equally above and below the midplane simulate toroidal conductive loops or hoops that are continuous, for vertical stabilization of the plasma even though they are actually segmented. 5 figs.

  12. Mask-assisted seeded growth of segmented metallic heteronanostructures

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

    Crane, Cameron C.; Tao, Jing; Wang, Feng; Zhu, Yimei; Chen, Jingyi

    2014-12-04T23:59:59.000Z

    Controlling the deposition of exotic metals in the seeded growth of multi-metal nanostructures is challenging. This work describes a seeded growth method assisted by a mask for synthesis of segmented binary or ternary metal nanostructures. Silica is used as a mask to partially block the surface of a seed and a second metal is subsequently deposited on the exposed area, forming a bimetallic heterodimer. The initial demonstration was carried out on a Au seed, followed by deposition of Pd or Pt on the seed. It was found that Pd tends to spread out laterally on the seed while Pt inclinesmore »to grow vertically into branched topology on Au. Without removal of the SiO? mask, Pt could be further deposited on the unblocked Pd of the Pd-Au dimer to form a Pt-Pd-Au trimer. The mask-assisted seeded growth provides a general strategy to construct segmented metallic nanoarchitectures.« less

  13. Microscopy image segmentation tool: Robust image data analysis

    SciTech Connect (OSTI)

    Valmianski, Ilya, E-mail: ivalmian@ucsd.edu; Monton, Carlos; Schuller, Ivan K. [Department of Physics and Center for Advanced Nanoscience, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093 (United States)] [Department of Physics and Center for Advanced Nanoscience, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093 (United States)

    2014-03-15T23:59:59.000Z

    We present a software package called Microscopy Image Segmentation Tool (MIST). MIST is designed for analysis of microscopy images which contain large collections of small regions of interest (ROIs). Originally developed for analysis of porous anodic alumina scanning electron images, MIST capabilities have been expanded to allow use in a large variety of problems including analysis of biological tissue, inorganic and organic film grain structure, as well as nano- and meso-scopic structures. MIST provides a robust segmentation algorithm for the ROIs, includes many useful analysis capabilities, and is highly flexible allowing incorporation of specialized user developed analysis. We describe the unique advantages MIST has over existing analysis software. In addition, we present a number of diverse applications to scanning electron microscopy, atomic force microscopy, magnetic force microscopy, scanning tunneling microscopy, and fluorescent confocal laser scanning microscopy.

  14. Neutron Interactions as Seen by A Segmented Germanium Detector

    E-Print Network [OSTI]

    I. Abt; A. Caldwell; K. Kroeninger; J. Liu; X. Liu; B. Majorovits

    2007-11-14T23:59:59.000Z

    The GERmanium Detector Array, GERDA, is designed for the search for ``neutrinoless double beta decay'' (0-nu-2-beta) with germanium detectors enriched in Ge76. An 18-fold segmented prototype detector for GERDA Phase II was exposed to an AmBe neutron source to improve the understanding of neutron induced backgrounds. Neutron interactions with the germanium isotopes themselves and in the surrounding materials were studied. Segment information is used to identify neutron induced peaks in the recorded energy spectra. The Geant4 based simulation package MaGe is used to simulate the experiment. Though many photon peaks from germanium isotopes excited by neutrons are correctly described by Geant4, some physics processes were identified as being incorrectly treated or even missing.

  15. Mask-assisted seeded growth of segmented metallic heteronanostructures

    SciTech Connect (OSTI)

    Crane, Cameron C. [Univ. of Arkansas, Fayetteville, AR (United States); Tao, Jing [Brookhaven National Lab. (BNL), Upton, NY (United States); Wang, Feng [Univ. of Arkansas, Fayetteville, AR (United States); Zhu, Yimei [Brookhaven National Lab. (BNL), Upton, NY (United States); Chen, Jingyi [Univ. of Arkansas, Fayetteville, AR (United States)

    2014-12-04T23:59:59.000Z

    Controlling the deposition of exotic metals in the seeded growth of multi-metal nanostructures is challenging. This work describes a seeded growth method assisted by a mask for synthesis of segmented binary or ternary metal nanostructures. Silica is used as a mask to partially block the surface of a seed and a second metal is subsequently deposited on the exposed area, forming a bimetallic heterodimer. The initial demonstration was carried out on a Au seed, followed by deposition of Pd or Pt on the seed. It was found that Pd tends to spread out laterally on the seed while Pt inclines to grow vertically into branched topology on Au. Without removal of the SiO? mask, Pt could be further deposited on the unblocked Pd of the Pd-Au dimer to form a Pt-Pd-Au trimer. The mask-assisted seeded growth provides a general strategy to construct segmented metallic nanoarchitectures.

  16. GPU-based relative fuzzy connectedness image segmentation

    SciTech Connect (OSTI)

    Zhuge Ying; Ciesielski, Krzysztof C.; Udupa, Jayaram K.; Miller, Robert W. [Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892 (United States); Department of Mathematics, West Virginia University, Morgantown, West Virginia 26506 (United States) and Medical Image Processing Group, Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States); Medical Image Processing Group, Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States); Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892 (United States)

    2013-01-15T23:59:59.000Z

    Purpose:Recently, clinical radiological research and practice are becoming increasingly quantitative. Further, images continue to increase in size and volume. For quantitative radiology to become practical, it is crucial that image segmentation algorithms and their implementations are rapid and yield practical run time on very large data sets. The purpose of this paper is to present a parallel version of an algorithm that belongs to the family of fuzzy connectedness (FC) algorithms, to achieve an interactive speed for segmenting large medical image data sets. Methods: The most common FC segmentations, optimizing an Script-Small-L {sub {infinity}}-based energy, are known as relative fuzzy connectedness (RFC) and iterative relative fuzzy connectedness (IRFC). Both RFC and IRFC objects (of which IRFC contains RFC) can be found via linear time algorithms, linear with respect to the image size. The new algorithm, P-ORFC (for parallel optimal RFC), which is implemented by using NVIDIA's Compute Unified Device Architecture (CUDA) platform, considerably improves the computational speed of the above mentioned CPU based IRFC algorithm. Results: Experiments based on four data sets of small, medium, large, and super data size, achieved speedup factors of 32.8 Multiplication-Sign , 22.9 Multiplication-Sign , 20.9 Multiplication-Sign , and 17.5 Multiplication-Sign , correspondingly, on the NVIDIA Tesla C1060 platform. Although the output of P-ORFC need not precisely match that of IRFC output, it is very close to it and, as the authors prove, always lies between the RFC and IRFC objects. Conclusions: A parallel version of a top-of-the-line algorithm in the family of FC has been developed on the NVIDIA GPUs. An interactive speed of segmentation has been achieved, even for the largest medical image data set. Such GPU implementations may play a crucial role in automatic anatomy recognition in clinical radiology.

  17. Segmentation et appariement hierarchiques bases sur les pyramides combinatoires

    E-Print Network [OSTI]

    Brun, Chez Luc

    'objets , reconstruction 3D Probl`eme d'appariement apparier des r´egions inconsistance lors de l'´etape de segmentation probl`eme d'inconsistance un m^eme objet pr´esent dans 2 images peut ^etre cod´e diff´erement dans les^ot´es. cadre ´energetique plusieurs heuristiques de fusions J.H. PRUVOT (GREYC) ICISP - 2008-10-25 6 / 32 #12

  18. Dual-circuit segmented rail phased induction motor

    DOE Patents [OSTI]

    Marder, Barry M. (Albuquerque, NM); Cowan, Jr., Maynard (Albuquerque, NM)

    2002-01-01T23:59:59.000Z

    An improved linear motor utilizes two circuits, rather that one circuit and an opposed plate, to gain efficiency. The powered circuit is a flat conductive coil. The opposed segmented rail circuit is either a plurality of similar conductive coils that are shorted, or a plurality of ladders formed of opposed conductive bars connected by a plurality of spaced conductors. In each embodiment, the conductors are preferably cables formed from a plurality of intertwined insulated wires to carry current evenly.

  19. Involvement as a market segmentation strategy: segmenting the United States pleasure travel market with implications for marketing Texas tourism

    E-Print Network [OSTI]

    Johnson, Bobby Joe

    1988-01-01T23:59:59.000Z

    market plan is a comprehensive understanding of the consumers most likely to purchase the product or service offered. This is done most effectively through market segmentation, which enables facility and agency managers to effectively allocate... in their travel decision making process appears to address many of the problems associated with existing strategies. The way in which consumers make their purchasing decisions, whether products or services, has been tied to various behavioral aspects...

  20. Population and Climate Change:Population and Climate Change: Coupling Population Models withCoupling Population Models with

    E-Print Network [OSTI]

    Kalnay, Eugenia

    Coupling Population Models with Earth System ModelsEarth System Models Eugenia Kalnay, Safa Motesharrei, Jorge Rivas Change: Fully Coupling Population and Earth System Models" My research at the U. of Maryland #12

  1. DAVID L. PIKE Columbia University, Ph.D. with Distinction in Comparative Literature, 1993.

    E-Print Network [OSTI]

    Lansky, Joshua

    DAVID L. PIKE EDUCATION Columbia University, Ph.D. with Distinction in Comparative Literature, 1993. Columbia University, M.A. in French and Romance Philology, 1987. Swarthmore College, B.A. with Distinction Teaching Fellow and Lecturer in Comparative Literature, Columbia University, 1993­95. Preceptor

  2. Image segmentation and analysis via multiscale gradient watershed hierarchies

    E-Print Network [OSTI]

    Gauch, John M.

    1999-01-01T23:59:59.000Z

    . Machine Intell., vol. 9, pp. 726–741, Nov. 1987. [3] S. Buecher, “Watersheds of functions and picture segmentation,” in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing, Paris, France, May 1982, pp. 1928–1931. [4] S. Beucher and F. Meyer... based on morphological filtering,” IEEE Trans.Pattern Anal.Machine Intell., vol. 11, pp. 649–700, 1989. [11] J. J. Clark, “Singularities of contrast functions in scale space,” in Proc. 1st Int. Conf. Computer Vision, London, U.K., 1987, pp. 491–495. [12...

  3. Segmentation of speech based on adaptive pitch prediction

    E-Print Network [OSTI]

    Ødega?rd, Jan Erik

    1990-01-01T23:59:59.000Z

    on periodicity tends to reduce prediction gain due to the frame/energy distribution, and therefore using the SNR as a measure of filter performance has to be evaluated in light of how well pitch peaks are removed in the speech signal. ACKNOWLEDGMENTS I wish.... Stability of LPC synthesis filters D. Pitch predictor II SPEECH SEGMENTATION 5 7 8 11 12 14 19 A. Derivation of Algorithms 1. Optimum and sub-optimum pitch analysis frame 2. Minimum deviation pitch frame estimation 3. Adaptive minimum deviation...

  4. Market Segmentation and Energy Efficiency Program Design | Department of

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment3311, 3312), October 2012 (MECSEnergyEnergy Market Segmentation

  5. Assessment of the Contemporary Population Structure and Admixture of Atlantic Swordfish (Xiphias gladius L.) via Mixed Stock Analysis and Bayesian Clustering of Multiple Nuclear SNPS Genotyped through High Resolution Melting

    E-Print Network [OSTI]

    Smith, Brad 1979-

    2012-11-28T23:59:59.000Z

    North Atlantic and South Atlantic swordfish (Xiphias gladius L.) are currently managed as two stocks separated at 5°N. While previous studies of genetic population structure using both mitochondrial and nuclear DNA confirm two genetically distinct...

  6. Multi-Hypothesis CRF-Segmentation of Neural Tissue in Anisotropic EM Volumes

    E-Print Network [OSTI]

    Funke, Jan; Hamprecht, Fred; Cardona, Albert; Cook, Matthew

    2011-01-01T23:59:59.000Z

    We present an approach for the joint segmentation and grouping of similar components in anisotropic 3D image data and use it to segment neural tissue in serial sections electron microscopy (EM) images. We first construct a nested set of neuron segmentation hypotheses for each slice. A conditional random field (CRF) then allows us to evaluate both the compatibility of a specific segmentation and a specific inter-slice assignment of neuron candidates with the underlying observations. The model is solved optimally for an entire image stack simultaneously using integer linear programming (ILP), which yields the maximum a posteriori solution in amortized linear time in the number of slices. We evaluate the performance of our approach on an annotated sample of the Drosophila larva neuropil and show that the consideration of different segmentation hypotheses in each slice leads to a significant improvement in the segmentation and assignment accuracy.

  7. DISTINCT CHEMICAL REGIONS IN THE ''PRESTELLAR'' INFRARED DARK CLOUD G028.23-00.19

    SciTech Connect (OSTI)

    Sanhueza, Patricio; Jackson, James M. [Institute for Astrophysical Research, Boston University, Boston, MA 02215 (United States); Foster, Jonathan B. [Yale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06520 (United States); Jimenez-Serra, Izaskun [European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany); Dirienzo, William J. [Department of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903 (United States); Pillai, Thushara, E-mail: patricio@bu.edu [Caltech, MC 249-17, 1200 East California Boulevard, Pasadena, CA 91125 (United States)

    2013-08-20T23:59:59.000Z

    We have observed the Infrared Dark Cloud (IRDC) G028.23-00.19 at 3.3 mm using the Combined Array for Research in Millimeter-wave Astronomy. In its center, the IRDC hosts one of the most massive ({approx}1520 M{sub Sun }) quiescent, cold (12 K) clumps known (MM1). The low temperature, high NH{sub 2}D abundance, narrow molecular line widths, and absence of embedded infrared sources (from 3.6 to 70 {mu}m) indicate that the clump is likely prestellar. Strong SiO emission with broad line widths (6-9 km s{sup -1}) and high abundances ((0.8-4) Multiplication-Sign 10{sup -9}) is detected in the northern and southern regions of the IRDC, unassociated with MM1. We suggest that SiO is released to the gas phase from the dust grains through shocks produced by outflows from undetected intermediate-mass stars or clusters of low-mass stars deeply embedded in the IRDC. A weaker SiO component with narrow line widths ({approx}2 km s{sup -1}) and low abundances (4.3 Multiplication-Sign 10{sup -11}) is detected in the center-west region, consistent with either a ''subcloud-subcloud'' collision or an unresolved population of a few low-mass stars. We report widespread CH{sub 3}OH emission throughout the whole IRDC and the first detection of extended narrow methanol emission ({approx}2 km s{sup -1}) in a cold, massive prestellar clump (MM1). We suggest that the most likely mechanism releasing methanol into the gas phase in such a cold region is the exothermicity of grain-surface reactions. HN{sup 13}C reveals that the IRDC is actually composed of two distinct substructures ({sup s}ubclouds{sup )} separated in velocity space by {approx}1.4 km s{sup -1}. The narrow SiO component arises where the subclouds overlap. The spatial distribution of C{sub 2}H resembles that of NH{sub 2}D, which suggests that C{sub 2}H also traces cold gas in this IRDC.

  8. THEOREM 1.1.1 The distinct equivalence classes of an equivalence ...

    E-Print Network [OSTI]

    Preliminary Notions Ch.1. THEOREM 1.1.1 The distinct equivalence classes of an equivalence relation on A provide us with a decomposition of A as a union of ...

  9. Distinct Cyclin D Genes Show Mitotic Accumulation or Constant Levels of Transcripts in Tobacco

    E-Print Network [OSTI]

    Murray, J.A.H.

    Distinct Cyclin D Genes Show Mitotic Accumulation or Constant Levels of Transcripts in Tobacco-type cyclins accumulate peri- odically during the S, G2, and early M phases (A types) or G2 and early M phases

  10. Dynamics in Organic Ionic Liquids in Distinct Regions Using Charged and Uncharged Orientational Relaxation Probes

    E-Print Network [OSTI]

    Fayer, Michael D.

    Dynamics in Organic Ionic Liquids in Distinct Regions Using Charged and Uncharged Orientational probe molecules display markedly different rotational dynamics when analyzed using Stokes increasingly subslip as the length of ionic liquid alkyl chain is increased. The dynamics approach those

  11. Differing risk factor profiles of ischemic stroke subtypes: evidence for a distinct lacunar arteriopathy? 

    E-Print Network [OSTI]

    Jackson, Caroline Anne; Hutchinson, A; Dennis, MS; Wardlaw, Joanna M; Lindgren, A; Norrving, B; Anderson, CS; Hankey, GJ; Jamrozik, K; Appelros, P; Sudlow, Cathie

    Background and Purpose Differences in risk factor profiles between lacunar and other ischemic stroke subtypes may provide evidence for a distinct lacunar arteriopathy, but existing studies have limitations. We overcame ...

  12. TWO POPULATIONS OF GAMMA-RAY BURST RADIO AFTERGLOWS

    SciTech Connect (OSTI)

    Hancock, P. J.; Gaensler, B. M.; Murphy, T., E-mail: Paul.Hancock@Sydney.edu.au [Also at Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), The University of Sydney, Sydney, NSW 2006, Australia. (Australia)

    2013-10-20T23:59:59.000Z

    The detection rate of gamma-ray burst (GRB) afterglows is ?30% at radio wavelengths, much lower than in the X-ray (?95%) or optical (?70%) bands. The cause of this low radio detection rate has previously been attributed to limited observing sensitivity. We use visibility stacking to test this idea, and conclude that the low detection rate is instead due to two intrinsically different populations of GRBs: radio-bright and radio-faint. We calculate that no more than 70% of GRB afterglows are truly radio-bright, leaving a significant population of GRBs that lack a radio afterglow. These radio-bright GRBs have higher gamma-ray fluence, isotropic energies, X-ray fluxes, and optical fluxes than the radio-faint GRBs, thus confirming the existence of two physically distinct populations. We suggest that the gamma-ray efficiency of the prompt emission is responsible for the difference between the two populations. We also discuss the implications for future radio and optical surveys.

  13. Perturbation Theory for Population Dynamics

    E-Print Network [OSTI]

    Francisco M. Fernandez

    2007-12-20T23:59:59.000Z

    We prove that a recently proposed homotopy perturbation method for the treatment of population dynamics is just the Taylor expansion of the population variables about initial time. Our results show that this perturbation method fails to provide the global features of the ecosystem dynamics.

  14. MICROBIAL POPULATIONS FECAL PELLETS AND

    E-Print Network [OSTI]

    Luther, Douglas S.

    MICROBIAL POPULATIONS FECAL PELLETS AND AND BIOLU}IINESCENCEOF OCEANIC SEDII,IENTTRAP PARTICLES activities of microbial populations associated with fecal pellets col-Lecteo from oceanic zooplankton were (indicators of microbial growth and reproduction rates, respectively) were monitored in fecal pellets at time

  15. Estimated population near uranium tailings

    SciTech Connect (OSTI)

    Bloomster, C.H.; Brown, D.R.; Bruno, G.A.; Craig, S.N.; Dirks, J.A.; Griffin, E.A.; Reis, J.W.; Young, J.K.

    1984-01-01T23:59:59.000Z

    Population studies, which took place during the months of April, May, and June 1983, were performed for 27 active and 25 inactive mill sites. For each mill site, a table showing population by radius (1/2, 1, 2, 3, 4, and 5 km) in 16 compass directions was generated. 22 references, 6 tables.

  16. Beam Test of a Segmented Foil SEM Grid

    E-Print Network [OSTI]

    S. Kopp; D. Indurthy; Z. Pavlovich; M. Proga; R. Zwaska; S. Childress; R. Ford; C. Kendziora; T. Kobilarcik; C. Moore; G. Tassotto

    2005-07-29T23:59:59.000Z

    A prototype Secondary-electron Emission Monitor (SEM) was installed in the 8 GeV proton transport line for the MiniBooNE experiment at Fermilab. The SEM is a segmented grid made with 5 um Ti foils, intended for use in the 120 GeV NuMI beam at Fermilab. Similar to previous workers, we found that the full collection of the secondary electron signal requires a bias voltage to draw the ejected electrons cleanly off the foils, and this effect is more pronounced at larger beam intensity. The beam centroid and width resolutions of the SEM were measured at beam widths of 3, 7, and 8 mm, and compared to calculations. Extrapolating the data from this beam test, we expect a centroid and width resolutions of 20um and 25 um, respectively, in the NuMI beam which has 1 mm spot size.

  17. Using Doppler spectra to separate hydrometeor populations and analyze ice precipitation in multilayered mixed-phase clouds

    SciTech Connect (OSTI)

    Rambukkange, Mahlon P.; Verlinde, J.; Eloranta, E. W.; Flynn, Connor J.; Clothiaux, Eugene E.

    2011-01-31T23:59:59.000Z

    Multimodality of cloud radar Doppler spectra is used to partition cloud particle phases and to separate distinct ice populations in the radar sample volume, thereby facilitating analysis of individual ice showers in multilayered mixed-phase clouds. A 35-GHz cloud radar located at Barrow, Alaska, during the Mixed-Phase Arctic Cloud Experiment collected the Doppler spectra. Data from a pair of collocated depolarization lidars confirmed the presence of two liquid cloud layers reported in this study. Surprisingly, both of these cloud layers were embedded in ice precipitation yet maintained their liquid. Our spectral separation of the ice precipitation yielded two distinct ice populations: ice initiated within the two liquid cloud layers and ice precipitation formed in higher cloud layers. Comparisons of ice fall velocity versus radar reflectivity relationships derived for distinct showers reveal that a single relationship might not properly represent the ice showers during this period.

  18. Fast, Streaming 3D Levelset on the GPU for Smooth Multi-phase Segmentation

    E-Print Network [OSTI]

    Texas at Austin, University of

    Fast, Streaming 3D Levelset on the GPU for Smooth Multi-phase Segmentation Ojaswa Sharma1 , Qin at Austin, Austin, Texas, 78712-0027, USA {zqyork@ices,bajaj@cs}.utexas.edu Abstract. Level set method based. We show vol- umetric segmentation using higher order, multi-phase level set method with speedups

  19. AUTOMATIC HOT SPOT DETECTION AND SEGMENTATION IN WHOLE BODY FDG-PET IMAGES Haiying Guan1

    E-Print Network [OSTI]

    California at Santa Barbara, University of

    AUTOMATIC HOT SPOT DETECTION AND SEGMENTATION IN WHOLE BODY FDG-PET IMAGES Haiying Guan1 , Toshiro a system for automatic hot spots detection and segmentation in whole body FDG-PET images. The main in clinical PET images. 1.INTRODUCTION Positron emission tomography (PET) using fluorine-18 de- oxyglucose

  20. A Robust Audio Classification and Segmentation Method Lie Lu, Hao Jiang and HongJiang Zhang

    E-Print Network [OSTI]

    Jiang, Hao

    A Robust Audio Classification and Segmentation Method Lie Lu, Hao Jiang and HongJiang Zhang for audio classification that is capable of segmenting and classifying an audio stream into speech, music, environment sound and silence. Audio classification is processed in two steps, which makes it suitable

  1. ARTICLE IN PRESS 2 Expert knowledge-guided segmentation system for brain MRI

    E-Print Network [OSTI]

    Thompson, Paul

    U N C O R R EC TED PR O O F ARTICLE IN PRESS 1 2 Expert knowledge-guided segmentation system templates (simplex mesh surfaces) to the contours of the 17 target structures. These templates evolve resonance images; Simplex mesh surfaces; 3-D 26 segmentation system 27 28 Introduction 29 The rapid

  2. GRAPH-BASED METHOD FOR MULTITEMPORAL SEGMENTATION OF SEA ICE FLOES FROM SATELLITE DATA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    the Arc- tic sea ice pack in December 2007, continuously moved with the Arctic ocean currents and meltedGRAPH-BASED METHOD FOR MULTITEMPORAL SEGMENTATION OF SEA ICE FLOES FROM SATELLITE DATA Claudio, MODIS, Sea Ice Floes. ABSTRACT: Automated segmentation of the sea ice evolution would allow scientists

  3. Evaluation of Segmentation Techniques for Inventory Management in Large Scale Multi-Item Inventory Systems1

    E-Print Network [OSTI]

    Rossetti, Manuel D.

    1 Evaluation of Segmentation Techniques for Inventory Management in Large Scale Multi-Item Inventory Systems1 Manuel D. Rossetti2 , Ph. D., P. E. Department of Industrial Engineering University of their inventory policies in a large-scale multi-item inventory system. Conventional inventory segmentation

  4. Segmentation and dimensionality reduction Ella Bingham Aristides Gionis Niina Haiminen Heli Hiisila Heikki Mannila

    E-Print Network [OSTI]

    Terzi, Evimaria

    in part by using a small number of underlying variables, e.g., oil price, general state of different the question of the relationships between segments: are the represen- tative values for different segments of financial time series, such as stock or currency prices. The dataset can be viewed as a multidimensional

  5. PRISACARIU, REID: PWP3D 1 PWP3D: Real-time segmentation and

    E-Print Network [OSTI]

    Oxford, University of

    method allows for fast 2D­3D pose tracking and 2D segmentation using a single, unified, energy function in print or electronic forms. #12;2 PRISACARIU, REID: PWP3D The most closely related work to our ownPRISACARIU, REID: PWP3D 1 PWP3D: Real-time segmentation and tracking of 3D objects Victor A

  6. Color Image Segmentation Using a Spatial K-Means Clustering Algorithm

    E-Print Network [OSTI]

    Whelan, Paul F.

    Color Image Segmentation Using a Spatial K-Means Clustering Algorithm Dana Elena Ilea and Paul F-texture segmentation that is a generalization of the standard K-Means algorithm. The standard K-Means algorithm. In addition, the initialization of the K-Means algorithm is problematic and usually the initial cluster

  7. 2D-GE IMAGE SEGMENTATION BASED ON LEVEL-SETS E.A. Mylona a

    E-Print Network [OSTI]

    Athens, University of

    2D-GE IMAGE SEGMENTATION BASED ON LEVEL-SETS E.A. Mylona a , M.A. Savelonas a , D. Maroulis a , M of protein spots in 2D-GE images. The proposed scheme incorporates a protein spot detection stage based both software packages in terms of segmentation performance. Index Terms--2D-GE Images, Protein Spot

  8. Augmenting CT Cardiac Roadmaps with Segmented Streaming Qi Duan a,b

    E-Print Network [OSTI]

    Augmenting CT Cardiac Roadmaps with Segmented Streaming Ultrasound Qi Duan a,b , Guy Shechter Static X-ray computed tomography (CT) volumes are often used as anatomic roadmaps during catheter. Augmenting these static CT roadmaps with segmented myocardial borders extracted from live ultrasound (US

  9. Wave Front Interaction Model of Stabilized Propagating Wave Segments Vladimir S. Zykov1

    E-Print Network [OSTI]

    Showalter, Kenneth

    Wave Front Interaction Model of Stabilized Propagating Wave Segments Vladimir S. Zykov1 and Kenneth; published 14 February 2005) A wave front interaction model is developed to describe the relationship between excitability and the size and shape of stabilized wave segments in a broad class of weakly excitable media

  10. REGION-BASED ACTIVE SURFACE MODELLING AND ALPHA MATTING FOR UNSUPERVISED TUMOUR SEGMENTATION IN PET

    E-Print Network [OSTI]

    Wang, Jue

    hierarchical segmentation scheme consists of three steps, as shown in the system flow-chart in Fig. 2 the Poisson Gradient Vector Flow (PGVF) of Hsu et al. [2] for edge-based seg- mentation and the Markov Random segmentation model [6, 7] are used to obtain an energy function that can be minimized by convex optimization

  11. An Experimental Comparison of Human and Automatic Music Segmentation Justin de Nooijer,*1

    E-Print Network [OSTI]

    Veltkamp, Remco

    , the experiments were designed to answer the following questions: Q1. Is there enough agreement in human melodyAn Experimental Comparison of Human and Automatic Music Segmentation Justin de Nooijer,*1 Frans works need to be decomposed into segments and voices. One would expect that methods that model human

  12. Interactive Graph Cut Based Segmentation With Shape Priors Daniel Freedman and Tao Zhang

    E-Print Network [OSTI]

    Interactive Graph Cut Based Segmentation With Shape Priors Daniel Freedman and Tao Zhang Computer segmentation can be very chal- lenging, a small amount of user input can often resolve ambiguous decisions can be very chal- lenging, a small amount of user input can often resolve am- biguous decisions

  13. Image Segmentation Based on GrabCut Framework Integrating Multi-scale Nonlinear Structure Tensor

    E-Print Network [OSTI]

    Soatto, Stefano

    Shoudong Han, Wenbing Tao, Desheng Wang Xue-cheng Tai, Xianglin Wu ABSTRACT In this paper, we propose contained in images and their unpredictable complexity, manual segmentation is tedious and time consuming automatically or semi-automatically with minimal user input. Existing image segmentation algorithms can

  14. The neural correlates of statistical learning in a word segmentation task: An fMRI study

    E-Print Network [OSTI]

    Aslin, Richard N.

    history: Available online xxxx Keywords: fMRI Statistical learning Word segmentation Artificial language of this statistical learning mechanism in the do- main of language acquisition (see also Saffran, Aslin, & NewportThe neural correlates of statistical learning in a word segmentation task: An fMRI study Elisabeth

  15. UNSUPERVISED MINING OF AUDIOVISUALLY CONSISTENT SEGMENTS IN VIDEOS WITH APPLICATION TO STRUCTURE ANALYSIS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    UNSUPERVISED MINING OF AUDIOVISUALLY CONSISTENT SEGMENTS IN VIDEOS WITH APPLICATION TO STRUCTURE technique is proposed to discover repeating video segments exhibiting audio and visual con- sistency accurate detection of the underlying event throughout the video. Event min- ing is applied to unsupervised

  16. Gestural Cohesion for Topic Segmentation Jacob Eisenstein and Regina Barzilay and Randall Davis

    E-Print Network [OSTI]

    Barzilay, Regina

    Gestural Cohesion for Topic Segmentation Jacob Eisenstein and Regina Barzilay and Randall Davis Massachusetts Ave., Cambridge MA 02139 {jacobe, regina, davis}@csail.mit.edu Abstract This paper explores-defined discourse segments. An advan- tage of this view is that gestures can be brought to bear on discourse

  17. Multi-stage Learning for Robust Lung Segmentation in Challenging CT Volumes

    E-Print Network [OSTI]

    Multi-stage Learning for Robust Lung Segmentation in Challenging CT Volumes Michal Sofka1 , Jens Imaging, Siemens Healthcare, Oxford, UK Abstract. Simple algorithms for segmenting healthy lung parenchyma an ini- tialization of a statistical shape model of the lungs. The initialization first detects

  18. A Framework for Automatic Segmentation of Lung Nodules from Low Dose Chest CT Scans

    E-Print Network [OSTI]

    Farag, Aly A.

    A Framework for Automatic Segmentation of Lung Nodules from Low Dose Chest CT Scans Ayman El-Baz1 the high accuracy of the proposed approach. 1 Introduction Because lung cancer is the most common cause 1, an initial LDCT slice is segmented with our algorithms introduced in [3] to isolate lung tissues

  19. A NOVEL FRAMEWORK FOR ACCURATE LUNG SEGMENTATION USING GRAPH CUTS Asem M. Ali1

    E-Print Network [OSTI]

    Louisville, University of

    A NOVEL FRAMEWORK FOR ACCURATE LUNG SEGMENTATION USING GRAPH CUTS Asem M. Ali1 Ayman S. El-Baz 2 Bioengineering Department, University of Louisville ABSTRACT The closeness of the gray levels between lung tissues and the chest tissues makes lung segmentation based only on image signals dif- ficult. This work

  20. Automatic Lung Segmentation of Volumetric Low-Dose CT Scans Using Graph Cuts

    E-Print Network [OSTI]

    Farag, Aly A.

    Automatic Lung Segmentation of Volumetric Low-Dose CT Scans Using Graph Cuts Asem M. Ali and Aly A for unsupervised segmentation of the lung region from low dose computed tomography (LDCT) images. We follow distribution model. To better spec- ify region borders between lung and chest, each empirical distribution

  1. Robust Segmentation of Challenging Lungs in CT using Multi-Stage Learning

    E-Print Network [OSTI]

    Robust Segmentation of Challenging Lungs in CT using Multi-Stage Learning and Level Set.Kevin Zhou1 Abstract Automatic segmentation of lung tissue in thoracic CT scans is useful for diagnosis and treatment planning of pulmonary diseases. Unlike healthy lung tissue that is easily identifiable in CT scans

  2. Chemical constraints on the contribution of population III stars to cosmic reionization

    SciTech Connect (OSTI)

    Kulkarni, Girish; Hennawi, Joseph F. [Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany); Rollinde, Emmanuel; Vangioni, Elisabeth, E-mail: girish@mpia-hd.mpg.de [Institut d'Astrophysique de Paris, UMR 7095, UPMC, Paris VI, 98 bis boulevard Arago, F-75014 Paris (France)

    2014-05-20T23:59:59.000Z

    Recent studies have highlighted that galaxies at z = 6-8 fall short of producing enough ionizing photons to reionize the intergalactic medium, and suggest that Population III stars could resolve this tension, because their harder spectra can produce ?10 × more ionizing photons than Population II. We use a semi-analytic model of galaxy formation, which tracks galactic chemical evolution, to gauge the impact of Population III stars on reionization. Population III supernovae produce distinct metal abundances, and we argue that the duration of the Population III era can be constrained by precise relative abundance measurements in high-z damped Ly? absorbers (DLAs), which provide a chemical record of past star formation. We find that a single generation of Population III stars can self-enrich galaxies above the critical metallicity Z {sub crit} = 10{sup –4} Z {sub ?} for the Population III-to-II transition, on a very short timescale t {sub self-enrich} ? 10{sup 6} yr, owing to the large metal yields and short lifetimes of Population III stars. This subsequently terminates the Population III era, so they contribute ? 50% of the ionizing photons only for z ? 30, and at z = 10 contribute <1%. The Population III contribution can be increased by delaying metal mixing into the interstellar medium. However, comparing the resulting metal abundance pattern to existing measurements in z ? 6 DLAs, we show that the observed [O/Si] ratios of absorbers rule out Population III stars being a major contributor to reionization. Future abundance measurements of z ? 7-8 QSOs and gamma-ray bursts should probe the era when the chemical vestiges of Population III star formation become detectable.

  3. Simultaneous segmentation and reconstruction: A level set method approach for limited view computed tomography

    SciTech Connect (OSTI)

    Yoon, Sungwon; Pineda, Angel R.; Fahrig, Rebecca [Department of Radiology, Stanford University, Stanford, California 94305 (United States); Department of Mathematics, California State University, Fullerton, California 92834 (United States); Department of Radiology, Stanford University, Stanford, California 94305 (United States)

    2010-05-15T23:59:59.000Z

    Purpose: An iterative tomographic reconstruction algorithm that simultaneously segments and reconstructs the reconstruction domain is proposed and applied to tomographic reconstructions from a sparse number of projection images. Methods: The proposed algorithm uses a two-phase level set method segmentation in conjunction with an iterative tomographic reconstruction to achieve simultaneous segmentation and reconstruction. The simultaneous segmentation and reconstruction is achieved by alternating between level set function evolutions and per-region intensity value updates. To deal with the limited number of projections, a priori information about the reconstruction is enforced via penalized likelihood function. Specifically, smooth function within each region (piecewise smooth function) and bounded function intensity values for each region are assumed. Such a priori information is formulated into a quadratic objective function with linear bound constraints. The level set function evolutions are achieved by artificially time evolving the level set function in the negative gradient direction; the intensity value updates are achieved by using the gradient projection conjugate gradient algorithm. Results: The proposed simultaneous segmentation and reconstruction results were compared to ''conventional'' iterative reconstruction (with no segmentation), iterative reconstruction followed by segmentation, and filtered backprojection. Improvements of 6%-13% in the normalized root mean square error were observed when the proposed algorithm was applied to simulated projections of a numerical phantom and to real fan-beam projections of the Catphan phantom, both of which did not satisfy the a priori assumptions. Conclusions: The proposed simultaneous segmentation and reconstruction resulted in improved reconstruction image quality. The algorithm correctly segments the reconstruction space into regions, preserves sharp edges between different regions, and smoothes the noise within each region. The proposed algorithm framework has the flexibility to be adapted to different a priori constraints while maintaining the benefits achieved by the simultaneous segmentation and reconstruction.

  4. Adaptive processing of thin structures to augment segmentation of dual-channel structural MRI of the human brain 

    E-Print Network [OSTI]

    Withers, James

    2010-01-01T23:59:59.000Z

    This thesis presents a method for the segmentation of dual-channel structural magnetic resonance imaging (MRI) volumes of the human brain into four tissue classes. The state-of-the-art FSL FAST segmentation software ...

  5. Comparison of Daytime and Nighttime Populations Adjacent to Interstate Highways in Metropolitan Areas Using LandScan USA

    SciTech Connect (OSTI)

    Johnson, Paul E [ORNL] [ORNL

    2007-01-01T23:59:59.000Z

    An article of similar title was published in the International Journal of Radioactive Materials Transport in 1999. The study concluded that the daytime and nighttime populations are not substantially different for the metropolitan areas examined. This study revisits the issue, but using the LandScan USA high resolution population distribution data, which includes daytime and night-time population. Segments of Interstate highway beltways, along with the direct route through the city, for Atlanta, St. Louis, and Kansas City are examined with an 800m buffer from either side of the highways. The day/night ratio of population is higher using the LandScan USA data. LandScan USA daytime and night-time data will be incorporated into the TRAGIS routing model in future.

  6. Determination of lung segments in computed tomography images using the Euclidean distance to the pulmonary artery

    SciTech Connect (OSTI)

    Stoecker, Christina; Moltz, Jan H.; Lassen, Bianca; Kuhnigk, Jan-Martin; Krass, Stefan [Fraunhofer MEVIS, Institute for Medical Image Computing, Universitaetsallee 29, 28359 Bremen (Germany)] [Fraunhofer MEVIS, Institute for Medical Image Computing, Universitaetsallee 29, 28359 Bremen (Germany); Welter, Stefan [Ruhrlandklinik, Department of Thoracic Surgery, Tueschener Weg 40, 45239 Essen (Germany)] [Ruhrlandklinik, Department of Thoracic Surgery, Tueschener Weg 40, 45239 Essen (Germany); Peitgen, Heinz-Otto [Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany)] [Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany)

    2013-09-15T23:59:59.000Z

    Purpose: Computed tomography (CT) imaging is the modality of choice for lung cancer diagnostics. With the increasing number of lung interventions on sublobar level in recent years, determining and visualizing pulmonary segments in CT images and, in oncological cases, reliable segment-related information about the location of tumors has become increasingly desirable. Computer-assisted identification of lung segments in CT images is subject of this work.Methods: The authors present a new interactive approach for the segmentation of lung segments that uses the Euclidean distance of each point in the lung to the segmental branches of the pulmonary artery. The aim is to analyze the potential of the method. Detailed manual pulmonary artery segmentations are used to achieve the best possible segment approximation results. A detailed description of the method and its evaluation on 11 CT scans from clinical routine are given.Results: An accuracy of 2–3 mm is measured for the segment boundaries computed by the pulmonary artery-based method. On average, maximum deviations of 8 mm are observed. 135 intersegmental pulmonary veins detected in the 11 test CT scans serve as reference data. Furthermore, a comparison of the presented pulmonary artery-based approach to a similar approach that uses the Euclidean distance to the segmental branches of the bronchial tree is presented. It shows a significantly higher accuracy for the pulmonary artery-based approach in lung regions at least 30 mm distal to the lung hilum.Conclusions: A pulmonary artery-based determination of lung segments in CT images is promising. In the tests, the pulmonary artery-based determination has been shown to be superior to the bronchial tree-based determination. The suitability of the segment approximation method for application in the planning of segment resections in clinical practice has already been verified in experimental cases. However, automation of the method accompanied by an evaluation on a larger number of test cases is required before application in the daily clinical routine.

  7. Inferring population history from genealogies 

    E-Print Network [OSTI]

    Lohse, Konrad R.

    2010-01-01T23:59:59.000Z

    This thesis investigates a range of genealogical approaches to making quantitative inferences about the spatial and demographic history of populations with application to two insect systems: A local radiation of high ...

  8. Population modeling using harpacticoid copepods

    E-Print Network [OSTI]

    , communities and ecosystems. Environmental management decisions rely on ERAs, which and Amphiascus tenuiremis, and demographic equations were used to calculate population statistical power for reproductive endpoints, but at high labor and cost. Therefore

  9. Joint Segmentation and Classification of Human Actions in Video Minh Hoai Zhen-Zhong Lan Fernando De la Torre

    E-Print Network [OSTI]

    De la Torre, Fernando

    Joint Segmentation and Classification of Human Actions in Video Minh Hoai Zhen-Zhong Lan Fernando@gmail.com, ftorre@cs.cmu.edu Abstract Automatic video segmentation and action recognition has been a long-standing problem in computer vision. Much work in the literature treats video segmentation and action recognition

  10. J Bone Miner Metab . Author manuscript Mineral maturity and crystallinity index are distinct characteristics of bone

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    J Bone Miner Metab . Author manuscript Page /1 13 Mineral maturity and crystallinity index are distinct characteristics of bone mineral Delphine Farlay 1 * , G rard Panczeré 2 , Christian Rey 3 , Pierre the hypothesis that mineral maturity and crystallinity index are two different characteristics of bone mineral

  11. As a leading research university with a distinctive commitment to undergraduate education, Rice

    E-Print Network [OSTI]

    Richards-Kortum, Rebecca

    1 #12;2 Mission As a leading research university with a distinctive commitment to undergraduate in fall 2004 #12;4 Expanding academic endeavor 2006: NanoJapan (U.S.-Japan cooperative research Infodynamics with Nanyang Technological University, Singapore 2010: Institute for Urban Research 2010

  12. Distinct Patterns of Expression But Similar Biochemical Properties of Protein L-Isoaspartyl Methyltransferase in

    E-Print Network [OSTI]

    Clarke, Steven

    and Biochemistry and the Molecular Biology Institute, Paul D. Boyer Hall, University of California, Los Angeles) plants in patterns distinct from those previously seen in winter wheat (Triticum aestivum cv Augusta) is similar to that of winter wheat. Although high levels of activity are found in the seeds of all

  13. Distinct compositional thin layers at mid-mantle depths beneath northeast China revealed by the USArray

    E-Print Network [OSTI]

    Niu, Fenglin

    Natural Gas Institute, China University of Petroleum, Beijing, China b Department of Earth Science, RiceDistinct compositional thin layers at mid-mantle depths beneath northeast China revealed crust northeast China USArray a b s t r a c t We observe a clear seismic arrival at $35­45 s after

  14. Distinct compositional thin layers at mid-mantle depths beneath northeast China revealed by the USArray

    E-Print Network [OSTI]

    Niu, Fenglin

    Natural Gas Institute, China University of Petroleum, Beijing, China b Department of Earth Science, RiceDistinct compositional thin layers at mid-mantle depths beneath northeast China revealed February 2013 Keywords: S to P converted wave mid-mantle reflectors subducted oceanic crust northeast China

  15. Two Distinctive Granite Suites in the SW Bohemian Massif and their Record of

    E-Print Network [OSTI]

    Siebel, Wolfgang

    Two Distinctive Granite Suites in the SW Bohemian Massif and their Record of Emplacement types of gneisses, migmatites and granites dominate the out- crops of the Bavarian Forest characteristics ofa crustal root zone. Fourteen granite intrusions from this area have been dated by the single

  16. Two Distinctive Granite Suites in the Southwestern Bohemian Massif: Reply to

    E-Print Network [OSTI]

    Siebel, Wolfgang

    Two Distinctive Granite Suites in the Southwestern Bohemian Massif: Reply to F. Finger and M. Rene geochemical and geochronological analyses of mainly crustal-derived late Variscan granites (328^321 Ma) from the Bavarian Forest, Moldanubian unit, Bohemian Massif. As an important observation, a high Ca^Sr^Y granite

  17. NOVEL INTEGRATING SOLID STATE DETECTOR WITH SEGMENTATION FOR SCANNING TRANSMISSION SOFT X-RAY MICROSCOPY.

    SciTech Connect (OSTI)

    FESER,M.; JACOBSEN,C.; REHAK,P.; DE GERONIMO,G.; HOLL,P.; STUDER,L.

    2001-07-29T23:59:59.000Z

    An integrating solid state detector with segmentation has been developed that addresses the needs in scanning transmission x-ray microscopy below 1 keV photon energy. The detector is not cooled and can be operated without an entrance window which leads to a total photon detection efficiency close to 100%. The chosen segmentation with 8 independent segments is matched to the geometry of the STXM to maximize image mode flexibility. In the bright field configuration for 1 ms integration time and 520 eV x-rays the rms noise is 8 photons per integration.

  18. SLUG -- Stochastically Lighting Up Galaxies. III: A Suite of Tools for Simulated Photometry, Spectroscopy, and Bayesian Inference with Stochastic Stellar Populations

    E-Print Network [OSTI]

    Krumholz, Mark R; da Silva, Robert L; Rendahl, Theodore; Parra, Jonathan

    2015-01-01T23:59:59.000Z

    Stellar population synthesis techniques for predicting the observable light emitted by a stellar population have extensive applications in numerous areas of astronomy. However, accurate predictions for small populations of young stars, such as those found in individual star clusters, star-forming dwarf galaxies, and small segments of spiral galaxies, require that the population be treated stochastically. Conversely, accurate deductions of the properties of such objects also requires consideration of stochasticity. Here we describe a comprehensive suite of modular, open-source software tools for tackling these related problems. These include: a greatly-enhanced version of the slug code introduced by da Silva et al. (2012), which computes spectra and photometry for stochastically- or deterministically-sampled stellar populations with nearly-arbitrary star formation histories, clustering properties, and initial mass functions; cloudy_slug, a tool that automatically couples slug-computed spectra with the cloudy r...

  19. Overview of the Electrical Energy Segment of the Energy Information Administration/ Manufacturing Consumption Report 

    E-Print Network [OSTI]

    Lockhead, S.

    1999-01-01T23:59:59.000Z

    , liquefied petroleum gas, coke and breeze, coal, and electricity, only the electricity segment is overviewed. Along with pure electrical energy consumption information, newly available data covers methods that manufacturers used to purchase and modify...

  20. Generalized Fast Marching Method: Applications to Image Segmentation. Nicolas Forcadel, 3,4

    E-Print Network [OSTI]

    Forcadel, Nicolas

    ,4 Carole Le Guyader, 5,6,7 Christian Gout Running title: GFMM: Applications to Image Segmentation@cemrics.enpc.fr, chris gout@cal.berkeley.edu, carole.le-guyader@insa-rennes.fr Abstract. In this paper, we propose

  1. Accent Phrase Segmentation by Finding N-Best Sequences of Pitch Pattern Templates 

    E-Print Network [OSTI]

    Nakai, Mitsuru; Shimodaira, Hiroshi

    This paper describes a prosodic method for segmenting continuous speech into accent phrases. Optimum sequences are obtained on the basis of least squared error criterion by using dynamic time warping between F0 contours ...

  2. Effect of auxin on Golgi-mediated cell wall synthesis in pea stem segments

    SciTech Connect (OSTI)

    Brummell, D.A.; Maclachlan, G.A.

    1986-04-01T23:59:59.000Z

    Stem segments of 7 day-old etiolated Pisum sativum seedlings were abraded using carborundum powder. Batches of segments were pulsed in (/sup 3/H) glucose followed by a chase in cold glucose in the presence or absence of 1AA, then homogenized by chopping with a razor blade. A rate-zonal centrifugation on a linear sucrose gradient was used to separate dictyosomes and secretory vesicles, and membrane-bound radioactivity determined as a measure of Golgi material in the cytoplasm. The amount of membrane-bound radioactivity was increased in tissues treated with 1AA for 30 min, indicative of an enhanced Golgi content in such segments. This increase thus precedes the sustained increase in auxin-stimulated growth of stem segments which occurs around 35-45 min after exposure to auxin and which is thought to be due to increased cell wall synthesis.

  3. Automatic detection and segmentation of renal lesions in 3D contrast-enhanced ultrasound images

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    segmentation is chosen as the one which maximizes the gradient flux through its boundary. Our method has been their membrane is eliminated by some metabolism processes. This modality is therefore considered as completely

  4. Image Segmentation by Complex-Valued Units Cornelius Weber and Stefan Wermter

    E-Print Network [OSTI]

    Weber, Cornelius

    Image Segmentation by Complex-Valued Units Cornelius Weber and Stefan Wermter Hybrid Intelligent-Verlag Berlin Heidelberg 2005 #12;520 C. Weber and S. Wermter be used for mutual binding and segregation

  5. Image Segmentation by ComplexValued Units Cornelius Weber and Stefan Wermter

    E-Print Network [OSTI]

    Weber, Cornelius

    Image Segmentation by Complex­Valued Units Cornelius Weber and Stefan Wermter Hybrid Intelligent # Springer­Verlag Berlin Heidelberg 2005 #12; 520 C. Weber and S. Wermter be used for mutual binding

  6. Some Extensions of the K-Means Algorithm for Image Segmentation and Pattern Classification

    E-Print Network [OSTI]

    Marroquin, Jose L.

    1993-01-01T23:59:59.000Z

    In this paper we present some extensions to the k-means algorithm for vector quantization that permit its efficient use in image segmentation and pattern classification tasks. It is shown that by introducing state ...

  7. Vortex nozzle for segmenting and transporting metal chips from turning operations

    DOE Patents [OSTI]

    Bieg, L.F.

    1993-04-20T23:59:59.000Z

    Apparatus for collecting, segmenting and conveying metal chips from machining operations utilizes a compressed gas driven vortex nozzle for receiving the chip and twisting it to cause the chip to segment through the application of torsional forces to the chip. The vortex nozzle is open ended and generally tubular in shape with a converging inlet end, a constant diameter throat section and a diverging exhaust end. Compressed gas is discharged through angled vortex ports in the nozzle throat section to create vortex flow in the nozzle and through an annular inlet at the entrance to the converging inlet end to create suction at the nozzle inlet and cause ambient air to enter the nozzle. The vortex flow in the nozzle causes the metal chip to segment and the segments thus formed to pass out of the discharge end of the nozzle where they are collected, cleaned and compacted as needed.

  8. Overview of the Electrical Energy Segment of the Energy Information Administration/ Manufacturing Consumption Report

    E-Print Network [OSTI]

    Lockhead, S.

    , liquefied petroleum gas, coke and breeze, coal, and electricity, only the electricity segment is overviewed. Along with pure electrical energy consumption information, newly available data covers methods that manufacturers used to purchase and modify...

  9. Segmentation of Spin-Echo MRI brain images: a comparison study of Crisp and Fuzzy algorithms

    E-Print Network [OSTI]

    Chung, Maranatha

    1993-01-01T23:59:59.000Z

    This thesis presents a scheme for segmenting Spin-Echo MRI brain images based on Fuzzy C-Mean (FCM) clustering techniques. This scheme consists of feature extraction, feature conditioning or evaluation, and thresholded FCM clustering. Feature...

  10. Stent-Assisted Coil Embolization of a Traumatic Wide-Necked Renal Segmental Artery Pseudoaneurysm

    SciTech Connect (OSTI)

    Schlunz-Hendann, Martin; Wetter, Axel, E-mail: axel.wetter@klinikum-duisburg.de [Duisburg Clinical Center, Clinic of Radiology and Neuroradiology (Germany); Landwehr, Peter [Hospital Henriettenstiftung, Clinic of Diagnostic and Interventional Radiology (Germany); Brassel, Friedhelm [Duisburg Clinical Center, Clinic of Radiology and Neuroradiology (Germany)

    2011-10-15T23:59:59.000Z

    We present the case of an Afghan woman with a renal segmental artery false aneurysm of the right kidney due to a shell splinter injury. Stent-assisted coil embolization of the aneurysm is described in detail.

  11. Initiation propagation and termination of elastodynamic ruptures associated with segmentation of faults and shaking

    E-Print Network [OSTI]

    Shaw, Bruce E.

    Initiation propagation and termination of elastodynamic ruptures associated with segmentation the initiation, propagation, and termination of ruptures and their relationship to fault geometry and shaking of terminations near fault ends; and persistent propagation directivity effects. Taking advantage of long

  12. INTEGRATING META-INFORMATION INTO EXEMPLAR-BASED SPEECH RECOGNITION WITH SEGMENTAL CONDITIONAL RANDOM FIELDS

    E-Print Network [OSTI]

    Hunt, Galen

    score. We found the segmental conditional random fields (SCRF) frame- work [7], and more in particular the meta-information that is extracted from k-NN template lists and introduce the SCRF appr

  13. A generative model for brain tumor segmentation in multi-modal images

    E-Print Network [OSTI]

    Sabuncu, Mert R.

    We propose a nonparametric, probabilistic model for the automatic segmentation of medical images, given a training set of images and corresponding label maps. The resulting inference algorithms rely on pairwise registrations ...

  14. Segmentation of nerve bundles and ganglia in spine MRI using particle filters

    E-Print Network [OSTI]

    Dalca, Adrian Vasile

    2012-01-01T23:59:59.000Z

    Automatic segmentation of spinal nerve bundles originating within the dural sac and exiting the spinal canal is important for diagnosis and surgical planning. The variability in intensity, contrast, shape and direction of ...

  15. Segmentation of nerve bundles and ganglia in spine MRI using particle filters

    E-Print Network [OSTI]

    Dalca, Adrian Vasile

    Automatic segmentation of spinal nerve bundles that originate within the dural sac and exit the spinal canal is important for diagnosis and surgical planning. The variability in intensity, contrast, shape and direction of ...

  16. Lung Extraction, Lobe Segmentation and Hierarchical Region Assessment for Quantitative Analysis on High

    E-Print Network [OSTI]

    Lung Extraction, Lobe Segmentation and Hierarchical Region Assessment for Quantitative Analysis Care Division, Brigham and Women's Hospital, Boston, MA Abstract. Regional assessment of lung disease specific to different lung regions on high resolution computed tomography (HRCT) datasets. We present

  17. IMPROVING FLUID REGISTRATION THROUGH WHITE MATTER SEGMENTATION Yi-Yu Chou1

    E-Print Network [OSTI]

    Thompson, Paul

    IMPROVING FLUID REGISTRATION THROUGH WHITE MATTER SEGMENTATION Yi-Yu Chou1 , Natasha Leporé1 J. Wright3 , Arthur W. Toga1 , Paul M. Thompson1 1 Laboratory of Neuro Imaging, UCLA Dept

  18. Can tissue segmentation improve registration? A study of 92 twins Yi-Yu Chou1

    E-Print Network [OSTI]

    Thompson, Paul

    Can tissue segmentation improve registration? A study of 92 twins Yi-Yu Chou1 , Natasha Leporé1 W. Toga1 , Paul M. Thompson1 1 Laboratory of Neuro Imaging, UCLA Dept. of Neurology, Los Angeles, CA

  19. IMPROVING FLUID REGISTRATION THROUGH WHITE MATTER SEGMENTATION IN A TWIN STUDY DESIGN

    E-Print Network [OSTI]

    Thompson, Paul

    IMPROVING FLUID REGISTRATION THROUGH WHITE MATTER SEGMENTATION IN A TWIN STUDY DESIGN Yi-Yu Chou1 J. Wright3 , Arthur W. Toga1 , Paul M. Thompson1 1 Laboratory of Neuro Imaging, UCLA Dept

  20. Market segmentation of visitors to Fort Wilkins State Park using a hierarchical clustering approach

    E-Print Network [OSTI]

    Fisher, Thomas Mark

    1980-01-01T23:59:59.000Z

    MARKET SEGMENTATION OF VISITORS TO FORT WILKINS STATE PARK USING A HIERARCHICAL CLUSTERING APPROACH A Thesis by THOMAS MARK FISHER Submitted to the Graduate College of Texas AAM University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE August 1980 Major Subject: Recreation and Resources Development MARKET SEGMENTATION OF VISITORS TO FORT WILKINS STATE PARK USING A HIERARCHICAL CLUSTERING APPROACH A Thesis by THOMAS MARK FISHER Approved as to style...

  1. Breast tumor segmentation in high resolution x-ray phase contrast analyzer based computed tomography

    SciTech Connect (OSTI)

    Brun, E., E-mail: emmanuel.brun@esrf.fr [European Synchrotron Radiation Facility (ESRF), Grenoble 380000, France and Department of Physics, Ludwig-Maximilians University, Garching 85748 (Germany); Grandl, S.; Sztrókay-Gaul, A.; Gasilov, S. [Institute for Clinical Radiology, Ludwig-Maximilians-University Hospital Munich, 81377 Munich (Germany); Barbone, G. [Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States); Mittone, A.; Coan, P. [Department of Physics, Ludwig-Maximilians University, Garching 85748, Germany and Institute for Clinical Radiology, Ludwig-Maximilians-University Hospital Munich, 81377 Munich (Germany); Bravin, A. [European Synchrotron Radiation Facility (ESRF), Grenoble 380000 (France)

    2014-11-01T23:59:59.000Z

    Purpose: Phase contrast computed tomography has emerged as an imaging method, which is able to outperform present day clinical mammography in breast tumor visualization while maintaining an equivalent average dose. To this day, no segmentation technique takes into account the specificity of the phase contrast signal. In this study, the authors propose a new mathematical framework for human-guided breast tumor segmentation. This method has been applied to high-resolution images of excised human organs, each of several gigabytes. Methods: The authors present a segmentation procedure based on the viscous watershed transform and demonstrate the efficacy of this method on analyzer based phase contrast images. The segmentation of tumors inside two full human breasts is then shown as an example of this procedure’s possible applications. Results: A correct and precise identification of the tumor boundaries was obtained and confirmed by manual contouring performed independently by four experienced radiologists. Conclusions: The authors demonstrate that applying the watershed viscous transform allows them to perform the segmentation of tumors in high-resolution x-ray analyzer based phase contrast breast computed tomography images. Combining the additional information provided by the segmentation procedure with the already high definition of morphological details and tissue boundaries offered by phase contrast imaging techniques, will represent a valuable multistep procedure to be used in future medical diagnostic applications.

  2. Automated segmentation of the pulmonary arteries in low-dose CT by vessel tracking

    E-Print Network [OSTI]

    Wala, Jeremiah; Lee, Jaesung; Jirapatnakul, Artit; Biancardi, Alberto; Reeves, Anthony

    2011-01-01T23:59:59.000Z

    We present a fully automated method for top-down segmentation of the pulmonary arterial tree in low-dose thoracic CT images. The main basal pulmonary arteries are identified near the lung hilum by searching for candidate vessels adjacent to known airways, identified by our previously reported airway segmentation method. Model cylinders are iteratively fit to the vessels to track them into the lungs. Vessel bifurcations are detected by measuring the rate of change of vessel radii, and child vessels are segmented by initiating new trackers at bifurcation points. Validation is accomplished using our novel sparse surface (SS) evaluation metric. The SS metric was designed to quantify the magnitude of the segmentation error per vessel while significantly decreasing the manual marking burden for the human user. A total of 210 arteries and 205 veins were manually marked across seven test cases. 134/210 arteries were correctly segmented, with a specificity for arteries of 90%, and average segmentation error of 0.15 mm...

  3. EO 12898: Environmental Justice in Minority Populations and Low...

    Office of Environmental Management (EM)

    EO 12898: Environmental Justice in Minority Populations and Low-Income Populations EO 12898: Environmental Justice in Minority Populations and Low-Income Populations To focus...

  4. Population Ecology ISSN 1438-3896

    E-Print Network [OSTI]

    de Aguiar, Marcus A. M.

    1 23 Population Ecology ISSN 1438-3896 Popul Ecol DOI 10.1007/s10144-012-0352-3 Impacts of enemy of Population Ecology and Springer Japan. This e-offprint is for personal use only and shall not be self of Population Ecology and Springer Japan 2012 Abstract In this study, we used data from both experi- ments

  5. Population Displacements Associated with Environmentally

    E-Print Network [OSTI]

    Columbia University

    Socio economic Impacts Enviro Impacts Dam Climate Change Fresh H20 Salinization Drought Flood infrastructure Climate Impact(s) Infrastructure development objectives Socio economic Impacts Enviro Impacts ­ Environmental impacts of major infrastructure projects 2 P l i di l i d i h l i f2. Population displacements

  6. The stellar population of bulges

    E-Print Network [OSTI]

    P. Jablonka

    2007-01-07T23:59:59.000Z

    This review summarizes the properties of the stellar population in bulges as observed in nearby or distant spiral galaxies. It gives a particular emphasis to the comparison with elliptical galaxies, when possible. The criteria of sample selection and choices in data analysis are addressed when they may be involved in discrepant results reached by different studies.

  7. The Evolution of Stellar Populations

    E-Print Network [OSTI]

    Angeles Diaz; Eduardo Hardy

    2001-03-14T23:59:59.000Z

    We summarize the discussion section on ``Evolution of Stellar Populations'' we led on May 27, 2000 in Granada, Spain, as part of the Euroconference on The Evolution of Galaxies. I- Observational Clues. We also provide a partial comparison between the present knowledge of these topics and that which existed at the time of the Crete Conference of 1995.

  8. Intrathymic programming of effector fates in three molecularly distinct ?? T cell subtypes

    E-Print Network [OSTI]

    Narayan, Kavitha

    Innate ?? T cells function in the early phase of immune responses. Although innate ?? T cells have often been studied as one homogenous population, they can be functionally classified into effector subsets on the basis of ...

  9. OUTER-DISK POPULATIONS IN NGC 7793: EVIDENCE FOR STELLAR RADIAL MIGRATION

    SciTech Connect (OSTI)

    Radburn-Smith, David J.; Dalcanton, Julianne J. [Department of Astronomy, University of Washington, Seattle, WA 98195 (United States); Roskar, Rok [Institut fuer Theoretische Physik, Universitaet Zuerich (Switzerland); Debattista, Victor P. [Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE (United Kingdom); Streich, David; De Jong, Roelof S.; Vlajic, Marija [Leibniz-Institut fuer Astrophysik Potsdam, D-14482 Potsdam (Germany); Holwerda, Benne W. [European Space Agency, ESTEC, 2200 AG Noordwijk (Netherlands); Purcell, Chris W. [Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States); Dolphin, Andrew E. [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85756 (United States); Zucker, Daniel B. [Department of Physics and Astronomy, Macquarie University, NSW 2109 (Australia)

    2012-07-10T23:59:59.000Z

    We analyzed the radial surface brightness profile of the spiral galaxy NGC 7793 using HST/ACS images from the GHOSTS survey and a new HST/WFC3 image across the disk break. We used the photometry of resolved stars to select distinct populations covering a wide range of stellar ages. We found breaks in the radial profiles of all stellar populations at 280'' ({approx}5.1 kpc). Beyond this disk break, the profiles become steeper for younger populations. This same trend is seen in numerical simulations where the outer disk is formed almost entirely by radial migration. We also found that the older stars of NGC 7793 extend significantly farther than the underlying H I disk. They are thus unlikely to have formed entirely at their current radii, unless the gas disk was substantially larger in the past. These observations thus provide evidence for substantial stellar radial migration in late-type disks.

  10. Interactive prostate segmentation using atlas-guided semi-supervised learning and adaptive feature selection

    SciTech Connect (OSTI)

    Park, Sang Hyun [Department of Radiology and BRIC, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 (United States); Gao, Yaozong, E-mail: yzgao@cs.unc.edu [Department of Computer Science, Department of Radiology, and BRIC, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 (United States); Shi, Yinghuan, E-mail: syh@nju.edu.cn [State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing 210023 (China); Shen, Dinggang, E-mail: dgshen@med.unc.edu [Department of Radiology and BRIC, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 and Department of Brain and Cognitive Engineering, Korea University, Seoul 136-713 (Korea, Republic of)

    2014-11-01T23:59:59.000Z

    Purpose: Accurate prostate segmentation is necessary for maximizing the effectiveness of radiation therapy of prostate cancer. However, manual segmentation from 3D CT images is very time-consuming and often causes large intra- and interobserver variations across clinicians. Many segmentation methods have been proposed to automate this labor-intensive process, but tedious manual editing is still required due to the limited performance. In this paper, the authors propose a new interactive segmentation method that can (1) flexibly generate the editing result with a few scribbles or dots provided by a clinician, (2) fast deliver intermediate results to the clinician, and (3) sequentially correct the segmentations from any type of automatic or interactive segmentation methods. Methods: The authors formulate the editing problem as a semisupervised learning problem which can utilize a priori knowledge of training data and also the valuable information from user interactions. Specifically, from a region of interest near the given user interactions, the appropriate training labels, which are well matched with the user interactions, can be locally searched from a training set. With voting from the selected training labels, both confident prostate and background voxels, as well as unconfident voxels can be estimated. To reflect informative relationship between voxels, location-adaptive features are selected from the confident voxels by using regression forest and Fisher separation criterion. Then, the manifold configuration computed in the derived feature space is enforced into the semisupervised learning algorithm. The labels of unconfident voxels are then predicted by regularizing semisupervised learning algorithm. Results: The proposed interactive segmentation method was applied to correct automatic segmentation results of 30 challenging CT images. The correction was conducted three times with different user interactions performed at different time periods, in order to evaluate both the efficiency and the robustness. The automatic segmentation results with the original average Dice similarity coefficient of 0.78 were improved to 0.865–0.872 after conducting 55–59 interactions by using the proposed method, where each editing procedure took less than 3 s. In addition, the proposed method obtained the most consistent editing results with respect to different user interactions, compared to other methods. Conclusions: The proposed method obtains robust editing results with few interactions for various wrong segmentation cases, by selecting the location-adaptive features and further imposing the manifold regularization. The authors expect the proposed method to largely reduce the laborious burdens of manual editing, as well as both the intra- and interobserver variability across clinicians.

  11. Combining prior day contours to improve automated prostate segmentation

    SciTech Connect (OSTI)

    Godley, Andrew; Sheplan Olsen, Lawrence J.; Stephans, Kevin [Department of Radiation Oncology, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio 44195 (United States); Zhao Anzi [Department of Radiation Oncology, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio 44195 and Department of Physics, Cleveland State University, 2121 Euclid Avenue, Cleveland, Ohio 44115 (United States)

    2013-02-15T23:59:59.000Z

    Purpose: To improve the accuracy of automatically segmented prostate, rectum, and bladder contours required for online adaptive therapy. The contouring accuracy on the current image guidance [image guided radiation therapy (IGRT)] scan is improved by combining contours from earlier IGRT scans via the simultaneous truth and performance level estimation (STAPLE) algorithm. Methods: Six IGRT prostate patients treated with daily kilo-voltage (kV) cone-beam CT (CBCT) had their original plan CT and nine CBCTs contoured by the same physician. Three types of automated contours were produced for analysis. (1) Plan: By deformably registering the plan CT to each CBCT and then using the resulting deformation field to morph the plan contours to match the CBCT anatomy. (2) Previous: The contour set drawn by the physician on the previous day CBCT is similarly deformed to match the current CBCT anatomy. (3) STAPLE: The contours drawn by the physician, on each prior CBCT and the plan CT, are deformed to match the CBCT anatomy to produce multiple contour sets. These sets are combined using the STAPLE algorithm into one optimal set. Results: Compared to plan and previous, STAPLE improved the average Dice's coefficient (DC) with the original physician drawn CBCT contours to a DC as follows: Bladder: 0.81 {+-} 0.13, 0.91 {+-} 0.06, and 0.92 {+-} 0.06; Prostate: 0.75 {+-} 0.08, 0.82 {+-} 0.05, and 0.84 {+-} 0.05; and Rectum: 0.79 {+-} 0.06, 0.81 {+-} 0.06, and 0.85 {+-} 0.04, respectively. The STAPLE results are within intraobserver consistency, determined by the physician blindly recontouring a subset of CBCTs. Comparing plans recalculated using the physician and STAPLE contours showed an average disagreement less than 1% for prostate D98 and mean dose, and 5% and 3% for bladder and rectum mean dose, respectively. One scan takes an average of 19 s to contour. Using five scans plus STAPLE takes less than 110 s on a 288 core graphics processor unit. Conclusions: Combining the plan and all prior days via the STAPLE algorithm to produce treatment day contours is superior to the current standard of deforming only the plan contours to the daily CBCT. STAPLE also improves the precision, with a substantial decrease in standard deviation, a key for adaptive therapy. Geometrically and dosimetrically accurate contours can be automatically generated with STAPLE on prostate region kV CBCT in a time scale suitable for online adaptive therapy.

  12. Molecular analysis of the metabolic rates of discrete subsurface populations of sulfate reducers

    SciTech Connect (OSTI)

    Miletto, M.; Williams, K.H.; N'Guessan, A.L.; Lovley, D.R.

    2011-04-01T23:59:59.000Z

    Elucidating the in situ metabolic activity of phylogenetically diverse populations of sulfate-reducing microorganisms that populate anoxic sedimentary environments is key to understanding subsurface ecology. Previous pure culture studies have demonstrated that transcript abundance of dissimilatory (bi)sulfite reductase genes is correlated with the sulfate reducing activity of individual cells. To evaluate whether expression of these genes was diagnostic for subsurface communities, dissimilatory (bi)sulfite reductase gene transcript abundance in phylogenetically distinct sulfate-reducing populations was quantified during a field experiment in which acetate was added to uranium-contaminated groundwater. Analysis of dsrAB sequences prior to the addition of acetate indicated that Desulfobacteraceae, Desulfobulbaceae, and Syntrophaceae-related sulfate reducers were the most abundant. Quantifying dsrB transcripts of the individual populations suggested that Desulfobacteraceae initially had higher dsrB transcripts per cell than Desulfobulbaceae or Syntrophaceae populations, and that the activity of Desulfobacteraceae increased further when the metabolism of dissimilatory metal reducers competing for the added acetate declined. In contrast, dsrB transcript abundance in Desulfobulbaceae and Syntrophaceae remained relatively constant, suggesting a lack of stimulation by added acetate. The indication of higher sulfate-reducing activity in the Desulfobacteraceae was consistent with the finding that Desulfobacteraceae became the predominant component of the sulfate-reducing community. Discontinuing acetate additions resulted in a decline in dsrB transcript abundance in the Desulfobacteraceae. These results suggest that monitoring transcripts of dissimilatory (bi)sulfite reductase genes in distinct populations of sulfate reducers can provide insight into the relative rates of metabolism of different components of the sulfate-reducing community and their ability to respond to environmental perturbations.

  13. Origin of multiple stellar populations in globular clusters and their helium enrichment

    E-Print Network [OSTI]

    Alvio Renzini

    2008-08-29T23:59:59.000Z

    The various scenarios proposed for the origin of the multiple, helium-enriched populations in massive globular clusters are critically compared to the relevant constraining observations. Among accretion of helium-rich material by pre-existing stars, star formation out of ejecta from massive AGB stars or from fast rotating massive stars, and pollution by Population III stars, only the AGB option appears to be viable. Accretion or star formation out of outflowing disks would result in a spread of helium abundances, thus failing to produce the distinct, chemically homogeneous sub-populations such as those in the clusters $\\omega$ Cen and NGC 2808. Pollution by Population III stars would fail to produce sub-populations selectively enriched in helium, but maintaining the same abundance of heavy elements. Still, it is argued that for the AGB option to work two conditions should be satisfied: i) AGB stars experiencing the hot bottom burning process (i.e., those more massive than $\\sim 3 \\msun$) should rapidly eject their envelope upon arrival on the AGB, thus experiencing just a few third dredge-up episodes, and ii) clusters with multiple, helium enriched populations should be the remnants of much more massive systems, such as nucleated dwarf galaxies, as indeed widely assumed.

  14. Novel multimodality segmentation using level sets and Jensen-Rényi divergence

    SciTech Connect (OSTI)

    Markel, Daniel, E-mail: daniel.markel@mail.mcgill.ca [Medical Physics Unit, University of McGill, Montreal, Quebec H3H 2R9 (Canada)] [Medical Physics Unit, University of McGill, Montreal, Quebec H3H 2R9 (Canada); Zaidi, Habib [Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211 Geneva (Switzerland) [Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211 Geneva (Switzerland); Geneva Neuroscience Center, Geneva University, CH-1205 Geneva (Switzerland); Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen P.O. Box 30 001 (Netherlands); El Naqa, Issam [Faculty of Medicine, Department of Oncology, Medical Physics Unit, McGill University, Montreal, Quebec H3G 1A4 (Canada)] [Faculty of Medicine, Department of Oncology, Medical Physics Unit, McGill University, Montreal, Quebec H3G 1A4 (Canada)

    2013-12-15T23:59:59.000Z

    Purpose: Positron emission tomography (PET) is playing an increasing role in radiotherapy treatment planning. However, despite progress, robust algorithms for PET and multimodal image segmentation are still lacking, especially if the algorithm were extended to image-guided and adaptive radiotherapy (IGART). This work presents a novel multimodality segmentation algorithm using the Jensen-Rényi divergence (JRD) to evolve the geometric level set contour. The algorithm offers improved noise tolerance which is particularly applicable to segmentation of regions found in PET and cone-beam computed tomography. Methods: A steepest gradient ascent optimization method is used in conjunction with the JRD and a level set active contour to iteratively evolve a contour to partition an image based on statistical divergence of the intensity histograms. The algorithm is evaluated using PET scans of pharyngolaryngeal squamous cell carcinoma with the corresponding histological reference. The multimodality extension of the algorithm is evaluated using 22 PET/CT scans of patients with lung carcinoma and a physical phantom scanned under varying image quality conditions. Results: The average concordance index (CI) of the JRD segmentation of the PET images was 0.56 with an average classification error of 65%. The segmentation of the lung carcinoma images had a maximum diameter relative error of 63%, 19.5%, and 14.8% when using CT, PET, and combined PET/CT images, respectively. The estimated maximal diameters of the gross tumor volume (GTV) showed a high correlation with the macroscopically determined maximal diameters, with aR{sup 2} value of 0.85 and 0.88 using the PET and PET/CT images, respectively. Results from the physical phantom show that the JRD is more robust to image noise compared to mutual information and region growing. Conclusions: The JRD has shown improved noise tolerance compared to mutual information for the purpose of PET image segmentation. Presented is a flexible framework for multimodal image segmentation that can incorporate a large number of inputs efficiently for IGART.

  15. Radio faint AGN: a tale of two populations

    E-Print Network [OSTI]

    Padovani, P; Kellermann, K I; Miller, N; Mainieri, V; Tozzi, P

    2015-01-01T23:59:59.000Z

    We study the Extended Chandra Deep Field South (E-CDFS) Very Large Array sample, which reaches a flux density limit at 1.4 GHz of 32.5 microJy at the field centre and redshift ~ 4, and covers ~ 0.3 deg^2. Number counts are presented for the whole sample while the evolutionary properties and luminosity functions are derived for active galactic nuclei (AGN). The faint radio sky contains two totally distinct AGN populations, characterised by very different evolutions, luminosity functions, and Eddington ratios: radio-quiet (RQ)/radiative-mode, and radio-loud/jet-mode AGN. The radio power of RQ AGN evolves ~ (1+z)^2.5, similarly to star-forming galaxies, while the number density of radio-loud ones has a peak at ~ 0.5 and then declines at higher redshifts. The number density of radio-selected RQ AGN is consistent with that of X-ray selected AGN, which shows that we are sampling the same population. The unbiased fraction of radiative-mode RL AGN, derived from our own and previously published data, is a strong funct...

  16. SIMULATING ASTEROID RUBBLE PILES WITH A SELF-GRAVITATING SOFT-SPHERE DISTINCT ELEMENT METHOD MODEL

    SciTech Connect (OSTI)

    Sanchez, Paul; Scheeres, Daniel J. [Colorado Center for Astrodynamics Research, University of Colorado at Boulder, Boulder, CO 80309-431UCB (United States)

    2011-02-01T23:59:59.000Z

    This paper applies a soft-sphere distinct element method Granular Dynamics code to simulate asteroid regolith and rubble piles. Applications to regolith studies in low gravity are also studied. Then an algorithm to calculate self-gravity is derived and incorporated for full-scale simulations of rubble-pile asteroids using Granular Dynamics techniques. To test its validity, the algorithm's results are compared with the exact direct calculation of the gravitational forces. Further avenues to improve the performance of the algorithm are also discussed.

  17. A general few-projection method for tomographic reconstruction of samples consisting of several distinct materials

    SciTech Connect (OSTI)

    Myers, Glenn R. [Department of Applied Mathematics, Australian National University, Canberra ACT 0200 (Australia); Thomas, C. David L.; Clement, John G. [Melbourne Dental School, University of Melbourne, Melbourne 3010 (Australia); Paganin, David M. [School of Physics, Monash University, Clayton 3800 (Australia); CSIRO Materials Science and Engineering, PB 33, Clayton South, 3169 (Australia); Gureyev, Timur E. [CSIRO Materials Science and Engineering, PB 33, Clayton South, 3169 (Australia)

    2010-01-11T23:59:59.000Z

    We present a method for tomographic reconstruction of objects containing several distinct materials, which is capable of accurately reconstructing a sample from vastly fewer angular projections than required by conventional algorithms. The algorithm is more general than many previous discrete tomography methods, as: (i) a priori knowledge of the exact number of materials is not required; (ii) the linear attenuation coefficient of each constituent material may assume a small range of a priori unknown values. We present reconstructions from an experimental x-ray computed tomography scan of cortical bone acquired at the SPring-8 synchrotron.

  18. Evidence for Two Distinct Morphological Classes of Gamma-Ray Bursts from their Short Timescale Variability

    E-Print Network [OSTI]

    D. Q. Lamb; C. Graziani; I. A. Smith

    1993-06-15T23:59:59.000Z

    We have analyzed the 241 bursts for which peak counts $\\C$ exist in the publicly available Burst and Transient Source Experiment (BATSE) catalog. Introducing peak counts in 1024 ms as a measure of burst brightness $\\B$ and the ratio of peak counts in 64 and 1024 ms as a measure of short timescale variability $\\V$, we find a statistically significant correlation between the brightness and the short timescale variability of \\g-ray bursts. The bursts which are smoother on short timescales are both faint and bright, while the bursts which are variable on short timescales are faint only, suggesting the existence of two distinct morphological classes of bursts.

  19. Arthropod population and community dynamics in turfgrass

    E-Print Network [OSTI]

    Wang, Yong

    1998-01-01T23:59:59.000Z

    Non-target arthropod and nematode populations in ographics. fungal and nematode treated bermudagrass were contrasted with populations in a chlorpyrifos and an untreated control treatment. Fifty-five arthropod families or suborder, herein referred...

  20. Automatic lung segmentation from thoracic computed tomography scans using a hybrid approach with error detection

    SciTech Connect (OSTI)

    Rikxoort, Eva M. van; Hoop, Bartjan de; Viergever, Max A.; Prokop, Mathias; Ginneken, Bram van [Image Sciences Institute, Heidelberglaan 100, 3584 CX Utrecht (Netherlands); Department of Radiology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht (Netherlands); Image Sciences Institute, Heidelberglaan 100, 3584 CX Utrecht (Netherlands); Department of Radiology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht (Netherlands); Image Sciences Institute, Heidelberglaan 100, 3584 CX Utrecht (Netherlands)

    2009-07-15T23:59:59.000Z

    Lung segmentation is a prerequisite for automated analysis of chest CT scans. Conventional lung segmentation methods rely on large attenuation differences between lung parenchyma and surrounding tissue. These methods fail in scans where dense abnormalities are present, which often occurs in clinical data. Some methods to handle these situations have been proposed, but they are too time consuming or too specialized to be used in clinical practice. In this article, a new hybrid lung segmentation method is presented that automatically detects failures of a conventional algorithm and, when needed, resorts to a more complex algorithm, which is expected to produce better results in abnormal cases. In a large quantitative evaluation on a database of 150 scans from different sources, the hybrid method is shown to perform substantially better than a conventional approach at a relatively low increase in computational cost.

  1. A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments

    SciTech Connect (OSTI)

    Leviner, L.; Aalseth, Craig E.; Ahmed, M. W.; Avignone, F. T.; Back, Henning O.; Barabash, Alexander S.; Boswell, M.; De Braeckeleer, L.; Brudanin, V.; Chan, Yuen-Dat; Egorov, Viatcheslav; Elliott, Steven R.; Gehman, Victor M.; Hossbach, Todd W.; Kephart, Jeremy; Kidd, M. F.; Konovalov, S.; Lesko, Kevin; Li, Jingyi; Mei, Dongming; Mikhailov, S.; Miley, Harry S.; Radford, D. C.; Reeves, James H.; Sandukovsky, Viatcheslav; Umatov, Valdimir; Underwood, T. A.; Tornow, W.; Wu, Y. K.; Young, A.

    2014-01-21T23:59:59.000Z

    We present data characterizing the performance of the _rst segmented, N- type Ge detector, isotopically enriched to 85% 76Ge. This detector, based on the Ortec PT6x2 design and referred to as SEGA (Segmented, Enriched Germanium Assembly), was developed as a possible prototype for neutrinoless double beta-decay measurements by the Majorana collaboration. We present some of the general characteristics (including bias potential, efficiency, leakage current, and integral cross-talk) for this detector in its temporary cryostat. We also present an analysis of the resolution of the detector, and demonstrate that for all but two segments there is at least one channel that reaches the Majorana resolution goal below 4 keV FWHM at 2039 keV, and all channels are below 4.5 keV FWHM.

  2. Examination of the fundamental relation between ionic transport and segmental relaxation in polymer electrolytes

    SciTech Connect (OSTI)

    Wang, Yangyang [ORNL; Fan, Fei [ORNL; Agapov, Alexander L [ORNL; Saito, Tomonori [ORNL; Yang, Jun [ORNL; Yu, Xiang [ORNL; Hong, Kunlun [ORNL; Mays, Jimmy [University of Tennessee, Knoxville (UTK); Sokolov, Alexei P [ORNL

    2014-01-01T23:59:59.000Z

    Replacing traditional liquid electrolytes by polymers will significantly improve electrical energy storage technologies. Despite significant advantages for applications in electrochemical devices, the use of solid polymer electrolytes is strongly limited by their poor ionic conductivity. The classical theory predicts that the ionic transport is dictated by the segmental motion of the polymer matrix. As a result, the low mobility of polymer segments is often regarded as the limiting factor for development of polymers with sufficiently high ionic conductivity. Here, we show that the ionic conductivity in many polymers can be strongly decoupled from their segmental dynamics, in terms of both temperature dependence and relative transport rate. Based on this principle, we developed several polymers with superionic conductivity. The observed fast ion transport suggests a fundamental difference between the ionic transport mechanisms in polymers and small molecules and provides a new paradigm for design of highly conductive polymer electrolytes.

  3. Application of Micro-segmentation Algorithms to the Healthcare Market:A Case Study

    SciTech Connect (OSTI)

    Sukumar, Sreenivas R [ORNL] [ORNL; Aline, Frank [ORNL] [ORNL

    2013-01-01T23:59:59.000Z

    We draw inspiration from the recent success of loyalty programs and targeted personalized market campaigns of retail companies such as Kroger, Netflix, etc. to understand beneficiary behaviors in the healthcare system. Our posit is that we can emulate the financial success the companies have achieved by better understanding and predicting customer behaviors and translating such success to healthcare operations. Towards that goal, we survey current practices in market micro-segmentation research and analyze health insurance claims data using those algorithms. We present results and insights from micro-segmentation of the beneficiaries using different techniques and discuss how the interpretation can assist with matching the cost-effective insurance payment models to the beneficiary micro-segments.

  4. A Segmented, Enriched N-type Germanium Detector for Neutrinoless Double Beta-Decay Experiments

    E-Print Network [OSTI]

    L. E. Leviner; C. E. Aalseth; M. W. Ahmed; F. T. Avignone III; H. O. Back; A. S. Barabash; M. Boswell; L. De Braeckeleer; V. B. Brudanin; Y-D Chan; V. G. Egorov; S. R. Elliott; V. M. Gehman; T. W. Hossbach; J. D. Kephart; M. F. Kidd; S. I. Konovalov; K. T. Lesko; Jingyi Li; D-M Mei; S. Mikhailov; H. Miley; D. C. Radford; J. Reeves; V. G. Sandukovsky; V. I. Umatov; T. A. Underwood; W. Tornow; Y. K. Wu; A. R. Young

    2013-04-19T23:59:59.000Z

    We present data characterizing the performance of the first segmented, N-type Ge detector, isotopically enriched to 85% $^{76}$Ge. This detector, based on the Ortec PT6x2 design and referred to as SEGA (Segmented, Enriched Germanium Assembly), was developed as a possible prototype for neutrinoless double beta-decay measurements by the {\\sc Majorana} collaboration. We present some of the general characteristics (including bias potential, efficiency, leakage current, and integral cross-talk) for this detector in its temporary cryostat. We also present an analysis of the resolution of the detector, and demonstrate that for all but two segments there is at least one channel that reaches the {\\sc Majorana} resolution goal below 4 keV FWHM at 2039 keV, and all channels are below 4.5 keV FWHM.

  5. Stellar populations of bulges at low redshift

    E-Print Network [OSTI]

    Sanchez-Blazquez, Patricia

    2015-01-01T23:59:59.000Z

    This chapter summarizes our current understanding of the stellar population properties of bulges and outlines important future research directions.

  6. Segmented superconducting tape having reduced AC losses and method of making

    DOE Patents [OSTI]

    Foltyn, Stephen R. (Los Alamos, NM); Jia, Quanxi (Los Alamos, NM); Arendt, Paul N. (Los Alamos, NM); Holesinger, Terry G. (Los Alamos, NM); Wang, Haiyan (Los Alamos, NM)

    2009-09-22T23:59:59.000Z

    A superconducting tape having reduced AC losses. The tape has a high temperature superconductor layer that is segmented. Disruptive strips, formed in one of the tape substrate, a buffer layer, and the superconducting layer create parallel discontinuities in the superconducting layer that separate the current-carrying elements of the superconducting layer into strips or filament-like structures. Segmentation of the current-carrying elements has the effect of reducing AC current losses. Methods of making such a superconducting tape and reducing AC losses in such tapes are also disclosed.

  7. SOX2 Co-Occupies Distal Enhancer Elements with Distinct POU Factors in ESCs and NPCs to Specify Cell State

    E-Print Network [OSTI]

    Lodato, Michael A.

    SOX2 is a master regulator of both pluripotent embryonic stem cells (ESCs) and multipotent neural progenitor cells (NPCs); however, we currently lack a detailed understanding of how SOX2 controls these distinct stem cell ...

  8. Distinct roles for inhibitory neuron subtypes in cortical circuits : an examination of their structure, function, and connectivity

    E-Print Network [OSTI]

    Runyan, Caroline A. (Caroline Anne)

    2012-01-01T23:59:59.000Z

    Parvalbumin-containing (PV+) neurons and somatostatin-containing (SOM+) neurons are two key cortical inhibitory cell classes that are poised to play distinct computational roles in cortical circuits: PV+ neurons form ...

  9. Reactor Vessel and Reactor Vessel Internals Segmentation at Zion Nuclear Power Station - 13230

    SciTech Connect (OSTI)

    Cooke, Conrad; Spann, Holger [Siempelkamp Nuclear Services: 5229 Sunset Blvd., (Suite M), West Columbia, SC, 29169 (United States)] [Siempelkamp Nuclear Services: 5229 Sunset Blvd., (Suite M), West Columbia, SC, 29169 (United States)

    2013-07-01T23:59:59.000Z

    Zion Nuclear Power Station (ZNPS) is a dual-unit Pressurized Water Reactor (PWR) nuclear power plant located on the Lake Michigan shoreline, in the city of Zion, Illinois approximately 64 km (40 miles) north of Chicago, Illinois and 67 km (42 miles) south of Milwaukee, Wisconsin. Each PWR is of the Westinghouse design and had a generation capacity of 1040 MW. Exelon Corporation operated both reactors with the first unit starting production of power in 1973 and the second unit coming on line in 1974. The operation of both reactors ceased in 1996/1997. In 2010 the Nuclear Regulatory Commission approved the transfer of Exelon Corporation's license to ZionSolutions, the Long Term Stewardship subsidiary of EnergySolutions responsible for the decommissioning of ZNPS. In October 2010, ZionSolutions awarded Siempelkamp Nuclear Services, Inc. (SNS) the contract to plan, segment, remove, and package both reactor vessels and their respective internals. This presentation discusses the tools employed by SNS to remove and segment the Reactor Vessel Internals (RVI) and Reactor Vessels (RV) and conveys the recent progress. SNS's mechanical segmentation tooling includes the C-HORCE (Circumferential Hydraulically Operated Cutting Equipment), BMT (Bolt Milling Tool), FaST (Former Attachment Severing Tool) and the VRS (Volume Reduction Station). Thermal segmentation of the reactor vessels will be accomplished using an Oxygen- Propane cutting system. The tools for internals segmentation were designed by SNS using their experience from other successful reactor and large component decommissioning and demolition (D and D) projects in the US. All of the designs allow for the mechanical segmentation of the internals remotely in the water-filled reactor cavities. The C-HORCE is designed to saw seven circumferential cuts through the Core Barrel and Thermal Shield walls with individual thicknesses up to 100 mm (4 inches). The BMT is designed to remove the bolts that fasten the Baffle Plates to the Baffle Former Plates. The FaST is designed to remove the Baffle Former Plates from the Core Barrel. The VRS further volume reduces segmented components using multiple configurations of the 38i and horizontal reciprocating saws. After the successful removal and volume reduction of the Internals, the RV will be segmented using a 'First in the US' thermal cutting process through a co-operative effort with Siempelkamp NIS Ingenieurgesellschaft mbH using their experience at the Stade NPP and Karlsruhe in Germany. SNS mobilized in the fall of 2011 to commence execution of the project in order to complete the RVI segmentation, removal and packaging activities for the first unit (Unit 2) by end of the 2012/beginning 2013 and then mobilize to the second unit, Unit 1. Parallel to the completion of the segmentation of the reactor vessel internals at Unit 1, SNS will segment the Unit 2 pressure vessel and at completion move to Unit 1. (authors)

  10. Image Segmentation using a Generalized Fast Marching Nicolas Forcadel (ENPC-CERMICS, Paris), Carole Le Guyader (INSA

    E-Print Network [OSTI]

    Forcadel, Nicolas

    ), Carole Le Guyader (INSA Rennes), Christian Gout (INRIA, France) Multivariate Approximation: Theory and Applications April 26 - May 01, 2007 N. Forcadel C. Le Guyader, C. Gout Image Segmentation #12;Plan 1 Fast. Le Guyader, C. Gout Image Segmentation #12;Plan 1 Fast Marching Method 2 Generalized Fast Marching

  11. IEEE TRANSACTIONS ON INFORMATION TECHNOLOGY IN BIOMEDICINE, VOL. 11, NO. 4, JULY 2007 443 Segmentation and Classification of Dot

    E-Print Network [OSTI]

    Lerner, Boaz

    Yeshaya Abstract--Signal segmentation and classification of fluorescence in situ hybridization (FISH classifier (NBC) or a multilayer perceptron is accomplished. When applied to a FISH image database, dot hybridization (FISH), image segmentation, multilayer perceptron (MLP), naive Bayesian classifier (NBC). I

  12. The original publication is available at: www.springerlink.com Parallel k-Means Image Segmentation Using

    E-Print Network [OSTI]

    Noé, Reinhold

    The original publication is available at: www.springerlink.com Parallel k-Means Image Segmentation. Abramov et al. [2] implemented a segmentation based on a clustering model from physics. K-means clustering the image as a graph (mesh) and extracting connected components. In the basic k-means clustering approaches

  13. Structure of bacteriophage T4 fibritin: a segmented coiled coil and the role of the C-terminal domain

    E-Print Network [OSTI]

    Tao, Yizhi Jane

    Structure of bacteriophage T4 fibritin: a segmented coiled coil and the role of the C-terminal and a small globular C-terminal domain about a crystallographic threefold axis. The coiled-coil domain is divided into three segments that are separated by insertion loops. The C-terminal domain, which consists

  14. 1/17RAPPORT INTERNE ETIS N 200201 Automatic fuzzy segmentation of color images and application in image retrieval

    E-Print Network [OSTI]

    Philipp-Foliguet, Sylvie

    . Applications concern pattern recognition or image retrieval. Features and distances are used to rank regions1/17RAPPORT INTERNE ETIS N° 2002­01 Automatic fuzzy segmentation of color images and application an algorithm that leads to a fuzzy segmentation. This algorithm performs, as in the watershed method

  15. 3D segmentation of mouse organs from MR images using deformable simplex mesh models G. Hamarneh1

    E-Print Network [OSTI]

    Hamarneh, Ghassan

    3D segmentation of mouse organs from MR images using deformable simplex mesh models G. Hamarneh1 , H. Delingette2 , M. Henkelman1 1 Hospital for Sick Children, Toronto, ON, Canada, 2 INRIA brains and kidneys from MR images. Algorithmic details and 3D segmentation results are presented

  16. COMPTEL Observation of GRB941017 with Distinct High-Energy Component

    SciTech Connect (OSTI)

    Kaneko, Y.; Preece, R.D.; Briggs, M.S. [University of Alabama in Huntsville/NSSTC, Huntsville, AL (United States); Hanlon, L. [University College Dublin, Dublin (Ireland); Gonzalez, M.M.; Dingus, B.L. [University of Wisconsin, Madison, WI/LANL, Los Alamos, NM (United States); Williams, O. R.; Bennett, K.; Winkler, C. [ESA/ESTEC, Noordwijk (Netherlands)

    2004-09-28T23:59:59.000Z

    The joint spectral analysis of GRB941017 with BATSE and EGRET data revealed the existence of a distinct MeV spectral component that decayed slower than the lower energy component. The event was also observed with COMPTEL burst modules, which provides burst spectra in the energy range of 300 keV to 10 MeV. Due to the limited energy overlap between the BATSE Large Area Detector and the EGRET Total Absorption Shower Counter spectra, the relative normalization between the two instruments is poorly constrained. The COMPTEL spectra complement the energy ranges of the BATSE and EGRET data and are used herein to confirm and improve upon the previous analysis. Using the data from all three instruments, we present the result of joint spectral analysis for GRB941017. Including the COMPTEL data improved the statistics for the time interval in which the high energy component is more apparent.

  17. Distinctive Signature of Indium Gallium Nitride Quantum Dot Lasing in Microdisks Cavities

    E-Print Network [OSTI]

    Woolf, Alexander; Aharanovich, Igor; Zhu, Tongtong; Niu, Nan; Wang, Danqing; Oliver, Rachel A; Hu, Evelyn L

    2014-01-01T23:59:59.000Z

    Low threshold lasers realized within compact, high quality optical cavities enable a variety of nanophotonics applications. Gallium nitride (GaN) materials containing indium gallium nitride (InGaN) quantum dots and quantum wells offer an outstanding platform to study light matter interactions and realize practical devices such as efficient light emitting diodes and nanolasers. Despite progress in the growth and characterization of InGaN quantum dots, their advantages as the gain medium in low threshold lasers have not been clearly demonstrated. This work seeks to better understand the reasons for these limitations by focusing on the simpler, limited-mode microdisk cavities, and by carrying out comparisons of lasing dynamics in those cavities using varying gain media including InGaN quantum wells, fragmented quantum wells, and a combination of fragmented quantum wells with quantum dots. For each gain medium, we utilize the distinctive, high quality (Q~5500) modes of the cavities, and the change in the highest ...

  18. Modeling the segment polarity gene network First: System is biologically defined; known expression patterns

    E-Print Network [OSTI]

    Albert, Réka

    are assumed to be not expressed. · Generate a set of kinetic parameters from the biologically relevant rangeModeling the segment polarity gene network First: System is biologically defined; known expression Boolean model: mRNA and protein activity is switch-like Validation: reproduces known gene expression

  19. Variational and Shape Prior-based Level Set Model for Image Segmentation

    SciTech Connect (OSTI)

    Diop, El Hadji S.; Jerbi, Taha; Burdin, Valerie [Image and Information Department, Telecom Bretagne / INSERM U650, Brest (France); Ba, Sileye O. [Signal and Communications Department, Telecom Bretagne / Lab-STICC, Brest (France)

    2010-09-30T23:59:59.000Z

    A new image segmentation model based on level sets approach is presented herein. We deal with radiographic medical images where boundaries are not salient, and objects of interest have the same gray level as other structures in the image. Thus, an a priori information about the shape we look for is integrated in the level set evolution for good segmentation results. The proposed model also accounts a penalization term that forces the level set to be close to a signed distance function (SDF), which then avoids the re-initialization procedure. In addition, a variant and complete Mumford-Shah model is used in our functional; the added Hausdorff measure helps to better handle zones where boundaries are occluded or not salient. Finally, a weighted area term is added to the functional to make the level set drive rapidly to object's boundaries. The segmentation model is formulated in a variational framework, which, thanks to calculus of variations, yields to partial differential equations (PDEs) to guide the level set evolution. Results obtained on both synthetic and digital radiographs reconstruction (DRR) show that the proposed model improves on existing prior and non-prior shape based image segmentation.

  20. Fuzzy hidden Markov chains segmentation for volume determination and quantitation in PET

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Fuzzy hidden Markov chains segmentation for volume determination and quantitation in PET M. Hatt1;52(12):3467-91" DOI : 10.1088/0031-9155/52/12/010 #12;2 ABSTRACT Accurate volume of interest (VOI) estimation in PET is concerned. inserm-00150348,version1-6Apr2009 #12;3 1. Introduction Positron Emission Tomography (PET) has

  1. Feature Based Rendering for 2D/3D Partial Volume Segmentation Zigang Wang1

    E-Print Network [OSTI]

    Feature Based Rendering for 2D/3D Partial Volume Segmentation Datasets Zigang Wang1 and Zhengrong 11794, USA ABSTRACT In this paper, a new feature based rendering algorithm for partial volume is presented. This algorithm utilizes both surface and volume information for the rendering of the partial

  2. STABILIZATION OF KINK INSTABILITIES BY EDDY CURRENTS IN A SEGMENTED WALL AND

    E-Print Network [OSTI]

    Mauel, Michael E.

    STABILIZATION OF KINK INSTABILITIES BY EDDY CURRENTS IN A SEGMENTED WALL AND COMPARISON WITH IDEAL and measured equi- librium wall eddy currents. The stability analysis of these equilibria predicts patterns of instability induced eddy currents for a model wall that is continuous and perfectly conducting

  3. A VARIATIONAL MODEL FOR INFINITE PERIMETER SEGMENTATIONS BASED ON LIPSCHITZ LEVEL SET FUNCTIONS

    E-Print Network [OSTI]

    -additive. In view of this behavior, the - neighborhood term penalizes the presence of isolated connected components penalization of the boundaries is replaced by the area of their neighborhood of thick- ness . Our aim level-set method. In the context of two phase segmentation the corresponding energy looks like Ecv[v, |u

  4. BEaST: Brain Extraction based on nonlocal Segmentation Technique Simon F. Eskildsena,b,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    BEaST: Brain Extraction based on nonlocal Segmentation Technique Simon F. Eskildsena,b, , PierrickConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, 3801 University Street Research Centre (DRC), UCL Institute of Neurology, Queens Square, London, WC1N 3BG, UK Abstract ­ Brain

  5. LATTICE SEGMENTATION AND SUPPORT VECTOR MACHINES FOR LARGE VOCABULARY CONTINUOUS SPEECH RECOGNITION

    E-Print Network [OSTI]

    Byrne, William

    LATTICE SEGMENTATION AND SUPPORT VECTOR MACHINES FOR LARGE VOCABULARY CONTINUOUS SPEECH RECOGNITION to transform a lattice into a sequence of confusions. · Lattice Error Rate preserved throughout the process. · Allows the use of simple yet powerful classifiers (e.g., SVMs) for ASR that otherwise would not have been

  6. Hyper-Rectangle Based Segmentation and Clustering of Large Video Data Sets

    E-Print Network [OSTI]

    Chung, Chin-Wan

    Hyper-Rectangle Based Segmentation and Clustering of Large Video Data Sets Seok-Lyong Lee* and Chin in the database community since it needs huge amount of storage space and processing power. In this paper, we investigate the problem of clustering large video data sets that are collections of video clips

  7. COMPUTING THE VISIBILITY POLYGONS OF THE ENDPOINTS OF A SET OF LINE SEGMENTS

    E-Print Network [OSTI]

    Wismath, Stephen

    TIME 3 MARK KEIL y AND STEPHEN WISMATH z Abstract. Given a set S of n non­intersecting line segments the endpoints of S in a spiral­like manner using a combination of Jarvis' March and depth­first search. One

  8. SHAPE-CONSTRAINED SEGMENTATION APPROACH FOR ARCTIC MULTIYEAR SEA ICE FLOE ANALYSIS

    E-Print Network [OSTI]

    Boyer, Edmond

    SHAPE-CONSTRAINED SEGMENTATION APPROACH FOR ARCTIC MULTIYEAR SEA ICE FLOE ANALYSIS Yuliya Tarabalka Research Association, MD, USA. e-mail: yuliya.tarabalka@inria.fr ABSTRACT The melting of sea ice, it is important to investigate how rapidly sea ice floes melt. For this purpose, a new TempoSeg method

  9. Active Gaze Control Improves Optic Flow-Based Segmentation and Steering

    E-Print Network [OSTI]

    Neumann, Heiko

    Active Gaze Control Improves Optic Flow-Based Segmentation and Steering Florian Raudies1,2 *, Ennio research on optic flow revealed its invariant properties and influence on steering control. This early. To support our suggestion we derive an analytical model that shows: Tangentially fixating the outer surface

  10. Energy Balance in Wireless Networks Using Connection Segmentation and Range Control

    E-Print Network [OSTI]

    Simha, Rahul

    Energy Balance in Wireless Networks Using Connection Segmentation and Range Control Nitin Kumar are optimized to balance energy consumption across the network. This paper formulates an en­ ergy balance­ nalized for their important role in network operation. While route selection to balance energy [13], [31

  11. Segmentation of building models from dense 3D point-clouds Joachim Bauer

    E-Print Network [OSTI]

    Schindler, Konrad

    , Institute for Computer Graphics and Vision, Graz University of Technology {bauer,karner,klausSegmentation of building models from dense 3D point-clouds Joachim Bauer , Konrad Karner , Konrad Schindler , Andreas Klaus , Christopher Zach VRVis Research Center for Virtual Reality and Visualization

  12. Interactive Separation of Segmented Bones in CT Volumes Using Graph Cut

    E-Print Network [OSTI]

    Ju, Tao

    mask customized to the shape of the bone, such as the femoral head. However, creat- ing masks for bones of different methodology have been reported for bone segmen- tation (see a recent survey in [1]). DueInteractive Separation of Segmented Bones in CT Volumes Using Graph Cut Lu Liu, David Raber, David

  13. Level Set Based Image Segmentation with Multiple Thomas Brox and Joachim Weickert

    E-Print Network [OSTI]

    to optimise the segmentation also with regard to the number of regions. Based on a variational model, we propose a minimisation strategy that robustly optimises the energy in a level set framework, including. Relatively early, the problem has been formalised by Mumford and Shah as the minimisation of an energy

  14. Knowledge-based Registration & Segmentation of the Left Ventricle: A Level Set Approach

    E-Print Network [OSTI]

    Paragios, Nikos

    Paragios ¡ Mikael Rousson ¢ Visvanathan Ramesh ¡ ¡ Siemens Corporate Research ¢ I.N.R.I.A. 755 College Road-mail: nikos@scr.siemens.com Abstract In this paper, we propose a level set formulation to deal is obtained using the same criterion where the transformation that aligns the latest segmentation map

  15. MRA Based Wavelet Frames and Applications: Image Segmentation and Surface Reconstruction

    E-Print Network [OSTI]

    Zakharov, Vladimir

    MRA Based Wavelet Frames and Applications: Image Segmentation and Surface Reconstruction Bin Dong1 Kent Ridge Road, Singapore, 119076 ABSTRACT Theory of wavelet frames and their applications to image restoration problems have been extensively studied for the past two decades. The success of wavelet frames

  16. Image segmentation using local spectral histograms and linear regression Jiangye Yuan a,

    E-Print Network [OSTI]

    Wang, DeLiang "Leon"

    , Center for Cognitive Science, The Ohio State University, Columbus, OH 43210, United States a r t i c l e filterbanks to decompose an image into a set of sub-bands. Filtering methods have received experimental sup- ports on human texture perception and have shown impressive per- formance for texture segmentation

  17. FILTERING OF ARTIFACTS AND PAVEMENT SEGMENTATION FROM MOBILE Jorge Hernandez and Beatriz Marcotegui

    E-Print Network [OSTI]

    Cord, Aurélien

    FILTERING OF ARTIFACTS AND PAVEMENT SEGMENTATION FROM MOBILE LIDAR DATA Jorge Hern the contour between pavements and roads. The method uses a quasi-flat zone algorithm and a region adjacency boundary. Finally, edges with a value compatible with the pavement/road difference (about 14[cm

  18. Differential-phase-shift quantum key distribution with segmented pulse trains

    SciTech Connect (OSTI)

    Kawahara, Hiroki; Inoue, Kyo [Osaka University, Osaka 565-0871 (Japan)

    2011-06-15T23:59:59.000Z

    We present a modified scheme of differential-phase-shift (DPS) quantum key distribution (QKD) for improving its performance. A transmitter sends a weak coherent pulse train segmented with vacant pulses. Then, a receiver can find eavesdropping by monitoring the photon detection rate at particular time slots. Simulations show that the proposed scheme is robust against a sequential attack and a general individual attack.

  19. 450 mm dual frequency capacitively coupled plasma sources: Conventional, graded, and segmented electrodes

    E-Print Network [OSTI]

    Kushner, Mark

    450 mm dual frequency capacitively coupled plasma sources: Conventional, graded, and segmented fabrication will soon transition from 300 to 450 mm at a time when excitation frequencies for capacitively of processing. The increase in diameter to 450 mm is likely to exacerbate these effects, perhaps requiring

  20. Segmentation and Enhancement of Latent Fingerprints: A Coarse to Fine Ridge

    E-Print Network [OSTI]

    ., "Image Quality Assessment: From Error Visibility to Structural Similarity", IEEE Transaction on ImageSegmentation and Enhancement of Latent Fingerprints: A Coarse to Fine Ridge Structure Dictionary ridge Pores · Include all dimensional attributes of the ridge such as pores, edge contour, incipient

  1. A Survey of Prostate Segmentation Methodologies in Ultrasound, Magnetic Resonance and Computed Tomography Images

    E-Print Network [OSTI]

    Boyer, Edmond

    A Survey of Prostate Segmentation Methodologies in Ultrasound, Magnetic Resonance and Computed@gmail.com (Soumya Ghose), aoliver@eia.udg.edu (Arnau Oliver), marly@eia.udg.edu (Robert Mart´i), llado@eia.udg.edu (Xavier Llad´o), jordif@eia.udg.edu (Jordi Freixenet), jhimlimitra@yahoo.com (Jhimli Mitra), desire

  2. Cardiac Valve Annulus Manual Segmentation Using Computer Assisted Visual Feedback in Three-Dimensional Image Data

    E-Print Network [OSTI]

    Oxford, University of

    Cardiac Valve Annulus Manual Segmentation Using Computer Assisted Visual Feedback in Three is an important tool for the study of valve anatomy and physiology, for the four main valves of the heart (mitral rat hearts, on all four valves. I. INTRODUCTION There are four main cardiac valves in the heart, two

  3. NEW DATA MODEL FOR GRAPH-CUT SEGMENTATION: APPLICATION TO AUTOMATIC MELANOMA DELINEATION

    E-Print Network [OSTI]

    Lezoray, Olivier

    NEW DATA MODEL FOR GRAPH-CUT SEGMENTATION: APPLICATION TO AUTOMATIC MELANOMA DELINEATION R. K but also texture and shape information. For melanoma images, we also introduce skin chromophore features- tion to melanoma delineation compares favorably to manual delineation and related graph

  4. Multilevel learning-based segmentation of ill-defined and spiculated masses in mammograms

    SciTech Connect (OSTI)

    Tao, Yimo; Lo, Shih-Chung B.; Freedman, Matthew T.; Makariou, Erini; Xuan, Jianhua [Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Arlington, Virginia 22203 (United States) and Department of Radiology, ISIS Center, Georgetown University Medical Center, Washington, DC 20007 (United States); Department of Radiology, ISIS Center, Georgetown University Medical Center, Washington, DC 20007 (United States); Department of Oncology, Georgetown University Medical Center, Washington, DC 20007 (United States); Department of Radiology, Georgetown University Medical Center, Washington, DC 20007 (United States); Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Arlington, Virginia 22203 (United States)

    2010-11-15T23:59:59.000Z

    Purpose: A learning-based approach integrating the use of pixel-level statistical modeling and spiculation detection is presented for the segmentation of mammographic masses with ill-defined margins and spiculations. Methods: The algorithm involves a multiphase pixel-level classification, using a comprehensive group of features computed from regional intensity, shape, and textures, to generate a mass-conditional probability map (PM). Then, the mass candidate, along with the background clutters consisting of breast fibroglandular and other nonmass tissues, is extracted from the PM by integrating the prior knowledge of shape and location of masses. A multiscale steerable ridge detection algorithm is employed to detect spiculations. Finally, all the object-level findings, including mass candidate, detected spiculations, and clutters, along with the PM, are integrated by graph cuts to generate the final segmentation mask. Results: The method was tested on 54 masses (51 malignant and 3 benign), all with ill-defined margins and irregular shape or spiculations. The ground truth delineations were provided by five experienced radiologists. Area overlapping ratio of 0.689 ({+-}0.160) and 0.540 ({+-}0.164) were obtained for segmenting entire mass and margin portion only, respectively. Williams index of area and contour based measurements indicated that the segmentation results of the algorithm agreed well with the radiologists' delineation. Conclusions: The proposed approach could closely delineate the mass body. Most importantly, it is capable of including mass margin and its spicule extensions which are considered as key features for breast lesion analyses.

  5. A nonlinear elastic deformable template for soft structure segmentation. Application to the heart

    E-Print Network [OSTI]

    Rouchdy, Youssef

    A nonlinear elastic deformable template for soft structure segmentation. Application to the heart of the heart's anatomy and motion from temporal image sequences, more precisely Magnetic Resonance Imaging (MRI) sequences. Currently, a clinical examination results in a stack of slices covering the whole heart

  6. Optimized Sampling Frequencies for Weld Reliability Assessments of Long Pipeline Segments

    E-Print Network [OSTI]

    Kreinovich, Vladik

    p. If this probability exceeds a certain regulated (small) threshold p 0 , the pipeline must. To be on the safe side, regulations require that a pipeline be repaired when it is possible that p â?? p 0 , iOptimized Sampling Frequencies for Weld Reliability Assessments of Long Pipeline Segments Cesar J

  7. Optimized Sampling Frequencies for Weld Reliability Assessments of Long Pipeline Segments

    E-Print Network [OSTI]

    Kreinovich, Vladik

    p. If this probability exceeds a certain regulated (small) threshold p0, the pipeline must. To be on the safe side, regulations require that a pipeline be repaired when it is possible that p p0, i.e., when pOptimized Sampling Frequencies for Weld Reliability Assessments of Long Pipeline Segments Cesar J

  8. Spatio-temporal segmentation of mesoscale ocean surface dynamics using satellite data

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Spatio-temporal segmentation of mesoscale ocean surface dynamics using satellite data Pierre Tandeo Temperature (SST) provide a wealth of information about ocean circulation, espe- cially mesoscale ocean an observation-driven framework, we investigate the extent to which mesoscale ocean dynamics may be decomposed

  9. GDP Formulation of a segmented CDU Swing Cut Model for Refinery Planning

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 GDP Formulation of a segmented CDU Swing Cut Model for Refinery Planning (Performance Analysis. Grossmann #12;2 Motivation · Refinery planning is an active area in process systems that strongly relies HF REFINERY FUEL RG LPG LN HN KN GO1 GO2 VGO VR1 VR2 C1 LPG LIGHT NAPHTHA PMS 98 MOGAS 95 JET FUEL

  10. BUILDING ROOF SEGMENTATION AND RECONSTRUCTION FROM LIDAR POINT CLOUDS USING CLUSTERING TECHNIQUES

    E-Print Network [OSTI]

    Shan, Jie

    BUILDING ROOF SEGMENTATION AND RECONSTRUCTION FROM LIDAR POINT CLOUDS USING CLUSTERING TECHNIQUES presents an approach to creating a polyhedral model of building roof from LiDAR point clouds using. The normal vectors are then clustered together to determine the principal directions of the roof planes

  11. Cortical Enhanced Tissue Segmentation of Neonatal Brain MR Images Acquired by a Dedicated Phased Array Coil

    E-Print Network [OSTI]

    Utah, University of

    Cortical Enhanced Tissue Segmentation of Neonatal Brain MR Images Acquired by a Dedicated Phased Carolina at Chapel Hill Abstract The acquisition of high quality MR images of neonatal brains is largely hampered by their characteristically small head size and low tissue contrast. As a result, subsequent image

  12. A Local Search Appproach for Transmembrane Segment and Signal Peptide Discrimination

    E-Print Network [OSTI]

    Hao, Jin-Kao

    , in the case of many membrane proteins that lack discrete signal peptides, the first transmembrane sequence proteins is a challenging task. This is particularly true for discriminating between transmembrane segments of proteins with the aim of ensuring good prediction. The LS Prediction approach is assessed on a constructed

  13. Intra-Chain 3D Segment Swapping Spawns the Evolution of New Multidomain Protein Architectures

    E-Print Network [OSTI]

    Zhang, Yang

    of new architectures is through three-dimensional (3D) domain swapping.15,16 In domain-swapped homodimers Available online 4 November 2011 Edited by M. Sternberg Keywords: domain swapping; protein evolution demonstrate that new multidomain architectures can evolve by an apparent three-dimensional swap of segments

  14. Factors controlling the variations in the mid-ocean ridge segmentation Eun-seo Choi1

    E-Print Network [OSTI]

    Choi, Eunseo

    . The driving forces are thermal stresses arising from the cooling of young oceanic crust and extensional the transition from one mode to the other. Besides the amount of stress from each driving force, the rate location of ridge segments are marked by the pairs of gray dashed lines. (b) The ridge-parallel component

  15. The neural correlates of statistical learning in a word segmentation task: An fMRI study

    E-Print Network [OSTI]

    Aslin, Richard N.

    language Sequence learning Broca's area LIFG a b s t r a c t Functional magnetic resonance imaging (f of this statistical learning mechanism in the do- main of language acquisition (see also Saffran, Aslin, & NewportThe neural correlates of statistical learning in a word segmentation task: An fMRI study Elisabeth

  16. Segmentation of mesoscale ocean surface dynamics using satellite SST and SSH observations

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Segmentation of mesoscale ocean surface dynamics using satellite SST and SSH observations Pierre about ocean circulation, espe- cially mesoscale ocean dynamics which may involve strong spatio- temporal to which mesoscale ocean dynamics may be decomposed into a mixture of dynamical modes, characterized

  17. Axial dispersion in segmented gas-liquid flow: Effects of alternating channel curvature

    E-Print Network [OSTI]

    Muradoglu, Metin

    processes such as two-phase catalytic monolith reactors,3­6 polymer blow molding, enhanced oil recovery,7 is periodically broken in the serpentine channel leading to enhanced axial dispersion. It is also found channel geometries. In addition to the enhanced mix- ing, the segmentation also reduces the axial

  18. A Framework for Unsupervised Segmentation of Lung Tissues from Low Dose Computed

    E-Print Network [OSTI]

    Kim, Tae-Kyun

    A Framework for Unsupervised Segmentation of Lung Tissues from Low Dose Computed Tomography Images of lung tis- sues from Low Dose Computed Tomography (LDCT) are proposed. In this paper we describe LDCT images and desired maps of regions (lung and the other chest tissues) by a joint Markov-Gibbs random

  19. Low-complexity atlas-based prostate segmentation by combining global, regional, and local metrics

    SciTech Connect (OSTI)

    Xie, Qiuliang; Ruan, Dan, E-mail: druan@mednet.ucla.edu [The Department of Radiation Oncology, University of California Los Angeles, California 90095 (United States)] [The Department of Radiation Oncology, University of California Los Angeles, California 90095 (United States)

    2014-04-15T23:59:59.000Z

    Purpose: To improve the efficiency of atlas-based segmentation without compromising accuracy, and to demonstrate the validity of the proposed method on MRI-based prostate segmentation application. Methods: Accurate and efficient automatic structure segmentation is an important task in medical image processing. Atlas-based methods, as the state-of-the-art, provide good segmentation at the cost of a large number of computationally intensive nonrigid registrations, for anatomical sites/structures that are subject to deformation. In this study, the authors propose to utilize a combination of global, regional, and local metrics to improve the accuracy yet significantly reduce the number of required nonrigid registrations. The authors first perform an affine registration to minimize the global mean squared error (gMSE) to coarsely align each atlas image to the target. Subsequently, atarget-specific regional MSE (rMSE), demonstrated to be a good surrogate for dice similarity coefficient (DSC), is used to select a relevant subset from the training atlas. Only within this subset are nonrigid registrations performed between the training images and the target image, to minimize a weighted combination of gMSE and rMSE. Finally, structure labels are propagated from the selected training samples to the target via the estimated deformation fields, and label fusion is performed based on a weighted combination of rMSE and local MSE (lMSE) discrepancy, with proper total-variation-based spatial regularization. Results: The proposed method was applied to a public database of 30 prostate MR images with expert-segmented structures. The authors’ method, utilizing only eight nonrigid registrations, achieved a performance with a median/mean DSC of over 0.87/0.86, outperforming the state-of-the-art full-fledged atlas-based segmentation approach of which the median/mean DSC was 0.84/0.82 when applying to their data set. Conclusions: The proposed method requires a fixed number of nonrigid registrations, independent of atlas size, providing desirable scalability especially important for a large or growing atlas. When applied to prostate segmentation, the method achieved better performance to the state-of-the-art atlas-based approaches, with significant improvement in computation efficiency. The proposed rationale of utilizing jointly global, regional, and local metrics, based on the information characteristic and surrogate behavior for registration and fusion subtasks, can be extended naturally to similarity metrics beyond MSE, such as correlation or mutual information types.

  20. Thoracic cavity segmentation algorithm using multiorgan extraction and surface fitting in volumetric CT

    SciTech Connect (OSTI)

    Bae, JangPyo [Interdisciplinary Program, Bioengineering Major, Graduate School, Seoul National University, Seoul 110-744, South Korea and Department of Radiology, University of Ulsan College of Medicine, 388-1 Pungnap2-dong, Songpa-gu, Seoul 138-736 (Korea, Republic of)] [Interdisciplinary Program, Bioengineering Major, Graduate School, Seoul National University, Seoul 110-744, South Korea and Department of Radiology, University of Ulsan College of Medicine, 388-1 Pungnap2-dong, Songpa-gu, Seoul 138-736 (Korea, Republic of); Kim, Namkug, E-mail: namkugkim@gmail.com; Lee, Sang Min; Seo, Joon Beom [Department of Radiology, University of Ulsan College of Medicine, 388-1 Pungnap2-dong, Songpa-gu, Seoul 138-736 (Korea, Republic of)] [Department of Radiology, University of Ulsan College of Medicine, 388-1 Pungnap2-dong, Songpa-gu, Seoul 138-736 (Korea, Republic of); Kim, Hee Chan [Department of Biomedical Engineering, College of Medicine and Institute of Medical and Biological Engineering, Medical Research Center, Seoul National University, Seoul 110-744 (Korea, Republic of)] [Department of Biomedical Engineering, College of Medicine and Institute of Medical and Biological Engineering, Medical Research Center, Seoul National University, Seoul 110-744 (Korea, Republic of)

    2014-04-15T23:59:59.000Z

    Purpose: To develop and validate a semiautomatic segmentation method for thoracic cavity volumetry and mediastinum fat quantification of patients with chronic obstructive pulmonary disease. Methods: The thoracic cavity region was separated by segmenting multiorgans, namely, the rib, lung, heart, and diaphragm. To encompass various lung disease-induced variations, the inner thoracic wall and diaphragm were modeled by using a three-dimensional surface-fitting method. To improve the accuracy of the diaphragm surface model, the heart and its surrounding tissue were segmented by a two-stage level set method using a shape prior. To assess the accuracy of the proposed algorithm, the algorithm results of 50 patients were compared to the manual segmentation results of two experts with more than 5 years of experience (these manual results were confirmed by an expert thoracic radiologist). The proposed method was also compared to three state-of-the-art segmentation methods. The metrics used to evaluate segmentation accuracy were volumetric overlap ratio (VOR), false positive ratio on VOR (FPRV), false negative ratio on VOR (FNRV), average symmetric absolute surface distance (ASASD), average symmetric squared surface distance (ASSSD), and maximum symmetric surface distance (MSSD). Results: In terms of thoracic cavity volumetry, the mean ± SD VOR, FPRV, and FNRV of the proposed method were (98.17 ± 0.84)%, (0.49 ± 0.23)%, and (1.34 ± 0.83)%, respectively. The ASASD, ASSSD, and MSSD for the thoracic wall were 0.28 ± 0.12, 1.28 ± 0.53, and 23.91 ± 7.64 mm, respectively. The ASASD, ASSSD, and MSSD for the diaphragm surface were 1.73 ± 0.91, 3.92 ± 1.68, and 27.80 ± 10.63 mm, respectively. The proposed method performed significantly better than the other three methods in terms of VOR, ASASD, and ASSSD. Conclusions: The proposed semiautomatic thoracic cavity segmentation method, which extracts multiple organs (namely, the rib, thoracic wall, diaphragm, and heart), performed with high accuracy and may be useful for clinical purposes.

  1. Technical Safety Requirements for the B695 Segment of the Decontamination and Waste Treatment Facility

    SciTech Connect (OSTI)

    Larson, H L

    2007-09-07T23:59:59.000Z

    This document contains Technical Safety Requirements (TSRs) for the Radioactive and Hazardous Waste Management (RHWM) Division's B695 Segment of the Decontamination and Waste Treatment Facility (DWTF) at Lawrence Livermore National Laboratory (LLNL). The TSRs constitute requirements regarding the safe operation of the B695 Segment of the DWTF. The TSRs are derived from the Documented Safety Analysis (DSA) for the B695 Segment of the DWTF (LLNL 2004). The analysis presented there determined that the B695 Segment of the DWTF is a low-chemical hazard, Hazard Category 3, nonreactor nuclear facility. The TSRs consist primarily of inventory limits as well as controls to preserve the underlying assumptions in the hazard analyses. Furthermore, appropriate commitments to safety programs are presented in the administrative controls section of the TSRs. The B695 Segment of the DWTF (B695 and the west portion of B696) is a waste treatment and storage facility located in the northeast quadrant of the LLNL main site. The approximate area and boundary of the B695 Segment of the DWTF are shown in the B695 Segment of the DWTF DSA. Activities typically conducted in the B695 Segment of the DWTF include container storage, lab-packing, repacking, overpacking, bulking, sampling, waste transfer, and waste treatment. B695 is used to store and treat radioactive, mixed, and hazardous waste, and it also contains equipment used in conjunction with waste processing operations to treat various liquid and solid wastes. The portion of the building called Building 696 Solid Waste Processing Area (SWPA), also referred to as B696S in this report, is used primarily to manage solid radioactive waste. Operations specific to the SWPA include sorting and segregating low-level waste (LLW) and transuranic (TRU) waste, lab-packing, sampling, and crushing empty drums that previously contained LLW. A permit modification for B696S was submitted to DTSC in January 2004 to store and treat hazardous and mixed waste. Upon approval of the permit modification, B696S rooms 1007, 1008, and 1009 will be able to store hazardous and mixed waste for up to 1 year. Furthermore, an additional drum crusher and a Waste Packaging Unit will be permitted to treat hazardous and mixed waste. RHWM generally processes LLW with no, or extremely low, concentrations of transuranics (i.e., much less than 100 nCi/g). Wastes processed often contain only depleted uranium and beta- and gamma-emitting nuclides, e.g., {sup 90}Sr, {sup 137}Cs, {sup 3}H. Chapter 5 of the DSA documents the derivation of TSRs and develops the operational limits that protect the safety envelope defined for this facility. The DSA is applicable to the handling of radioactive waste stored and treated in the B695 Segment of the DWTF. Section 5 of the TSR, Administrative Controls, contains those Administrative Controls necessary to ensure safe operation of the B695 Segment of the DWTF. A basis explanation follows each of the requirements described in Section 5.5, Specific Administrative Controls. The basis explanation does not constitute an additional requirement, but is intended as an expansion of the logic and reasoning behind development of the requirement. Programmatic Administrative Controls are addressed in Section 5.6.

  2. Brachial artery vasomotion and transducer pressure effect on measurements by active contour segmentation on ultrasound

    SciTech Connect (OSTI)

    Cary, Theodore W.; Sultan, Laith R.; Sehgal, Chandra M., E-mail: sehgalc@uphs.upenn.edu [Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States); Reamer, Courtney B.; Mohler, Emile R. [Department of Medicine, Division of Cardiovascular Medicine, Section of Vascular Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)] [Department of Medicine, Division of Cardiovascular Medicine, Section of Vascular Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)

    2014-02-15T23:59:59.000Z

    Purpose: To use feed-forward active contours (snakes) to track and measure brachial artery vasomotion on ultrasound images recorded in both transverse and longitudinal views; and to compare the algorithm's performance in each view. Methods: Longitudinal and transverse view ultrasound image sequences of 45 brachial arteries were segmented by feed-forward active contour (FFAC). The segmented regions were used to measure vasomotion artery diameter, cross-sectional area, and distention both as peak-to-peak diameter and as area. ECG waveforms were also simultaneously extracted frame-by-frame by thresholding a running finite-difference image between consecutive images. The arterial and ECG waveforms were compared as they traced each phase of the cardiac cycle. Results: FFAC successfully segmented arteries in longitudinal and transverse views in all 45 cases. The automated analysis took significantly less time than manual tracing, but produced superior, well-behaved arterial waveforms. Automated arterial measurements also had lower interobserver variability as measured by correlation, difference in mean values, and coefficient of variation. Although FFAC successfully segmented both the longitudinal and transverse images, transverse measurements were less variable. The cross-sectional area computed from the longitudinal images was 27% lower than the area measured from transverse images, possibly due to the compression of the artery along the image depth by transducer pressure. Conclusions: FFAC is a robust and sensitive vasomotion segmentation algorithm in both transverse and longitudinal views. Transverse imaging may offer advantages over longitudinal imaging: transverse measurements are more consistent, possibly because the method is less sensitive to variations in transducer pressure during imaging.

  3. Steam Dryer Segmentation and Packaging at Grand Gulf Nuclear Station - 13577

    SciTech Connect (OSTI)

    Kreitman, Paul J.; Sirianni, Steve R.; Pillard, Mark M. [Westinghouse Nuclear Services, 1 Energy Drive, Lake Bluff, Illinois 60044 (United States)] [Westinghouse Nuclear Services, 1 Energy Drive, Lake Bluff, Illinois 60044 (United States)

    2013-07-01T23:59:59.000Z

    Entergy recently performed an Extended Power Up-rate (EPU) on their Grand Gulf Nuclear Station, near Port Gibson, Mississippi. To support the EPU, a new Steam Dryer Assembly was installed during the last refueling outage. Due to limited access into the containment, the large Replacement Steam Dryer (RSD) had to be brought into the containment in pieces and then final assembly was completed on the refueling floor before installation into the reactor. Likewise, the highly contaminated Original Steam Dryer (OSD) had to be segmented into manageable sections, loaded into specially designed shielded containers, and rigged out of containment where they will be safely stored until final disposal is accomplished at an acceptable waste repository. Westinghouse Nuclear Services was contracted by Entergy to segment, package and remove the OSD from containment. This work was performed on critical path during the most recent refueling outage. The segmentation was performed underwater to minimize radiation exposure to the workers. Special hydraulic saws were developed for the cutting operations based on Westinghouse designs previously used in Sweden to segment ABB Reactor Internals. The mechanical cutting method was selected because of its proven reliability and the minimal cutting debris that is generated by the process. Maintaining stability of the large OSD sections during cutting was accomplished using a custom built support stand that was installed into the Moisture Separator Pool after the Moisture Separator was installed back in the reactor vessel. The OSD was then moved from the Steam Dryer Pool to the Moisture Separator Pool for segmentation. This scenario resolved the logistical challenge of having two steam dryers and a moisture separator in containment simultaneously. A water filtration/vacuum unit was supplied to maintain water clarity during the cutting and handling operations and to collect the cutting chips. (authors)

  4. K-MEANS BASED SEGMENTATION FOR REAL-TIME ZENITHAL PEOPLE COUNTING Borislav Antic, Dragan Letic, Dubravko Culibrk and Vladimir Crnojevic

    E-Print Network [OSTI]

    Heermann, Dieter W.

    K-MEANS BASED SEGMENTATION FOR REAL-TIME ZENITHAL PEOPLE COUNTING Borislav Anti´c, Dragan Leti-wise background subtraction, k-means clustering is used to enable the segmentation of single per- sons

  5. Stellar populations in bulges of spiral galaxies

    E-Print Network [OSTI]

    P. Jablonka

    1997-03-03T23:59:59.000Z

    We discuss the integrated properties of the stellar population in bulges along the Hubble sequence and new HST data for individual stars in the bulge of M31.

  6. X-ray populations in galaxies

    E-Print Network [OSTI]

    G. Fabbiano

    2005-11-09T23:59:59.000Z

    Today's sensistive, high resolution Chandra X-ray observations allow the study of many populations of X-ray sources. The traditional astronomical tools of photometric diagrams and luminosity functions are now applied to these populations, and provide the means for classifying the X-ray sources and probing their evolution. While overall stellar mass drives the amount of X-ray binaries in old stellar population, the amount of sources in star-forming galaxies is related to the star formation rate. Shart-lived, luminous, high mass binaries (HNXBs) dominate these young populations.

  7. Empirical Prediction Intervals for County Population Forecasts

    E-Print Network [OSTI]

    Rayer, Stefan; Smith, Stanley K.; Tayman, Jeff

    2009-01-01T23:59:59.000Z

    in the determination and prediction of population forecastperformance of empirical prediction intervals? Table 5 shows26, 163–184. Empirical Prediction Intervals for County

  8. Wavelength-dependent photochemistry of W(CO){sub 4}(en) (en = ethylenediamine): Evidence for distinct chemical reactivities from singlet and triplet ligand field excited states

    SciTech Connect (OSTI)

    Panesar, R.S.; Dunwoody, N.; Lees, A.J. [State Univ. of New York, Binghamton, NY (United States). Dept. of Chemistry] [State Univ. of New York, Binghamton, NY (United States). Dept. of Chemistry

    1998-04-06T23:59:59.000Z

    Studies of the photophysical and photochemical properties of organometallic compounds have now been extensively performed for over 25 years. In considering the photoreactivity of such complexes, it has usually been assumed that their singlet excited states are extremely short-lived and unreactive as a consequence of effective intersystem crossing mechanisms facilitated by the heavy metal and rapid internal conversions to the ground state. In this paper the authors report quantitative photochemical measurements obtained for W(CO){sub 4}(en) (en = ethylenediamine) following excitation into the lowest energy LF absorption manifold at several wavelengths. This system is of particular significance because, unlike most other substituted metal carbonyl complexes, its lowest lying LF absorption band is well removed from other electronic transitions and the lowest energy LF triplet absorption is a distinctive feature of the spectrum. Following excitation at various wavelengths, therefore, it is possible to populate the LF single and triplet energy levels exclusively and determine their quantitative photochemical reactivities directly. The results for W(CO){sub 4}(en) demonstrate conclusively that the LF excited states undergo separate photosubstitutional pathways and that reaction from the lowest lying LF triplet state takes place with a substantially reduced photoefficiency.

  9. Supernova rates and stellar populations

    E-Print Network [OSTI]

    F. Mannucci

    2007-08-03T23:59:59.000Z

    We discuss the results about the nature of type Ia Supernovae that can be derived by studying their rates in different stellar populations. While the evolution of SN photometry and spectra can constrain the explosion mechanism, the SN rate depends on the progenitor system. We review the current available data on rates as a function of parent galaxy color, morphology, star formation rate, radio luminosity and environment. By studying the variation of the rates with the color of the parent galaxy, a strong evidence was established that type Ia SNe come from both young and old stars. The dependence of the rates with the radio power of the parent galaxy is best reproduced by a bimodal distribution of delay time between the formation of the progenitor and its explosion as a SN. Cluster early-type galaxies show higher type Ia SN rate with respect to field galaxies, and this effect can be due either to traces of young stars or to differences in the delay time distribution.

  10. Population Structure of Columbia River Basin Chinook Salmon and Steelhead Trout, Technical Report 2001.

    SciTech Connect (OSTI)

    Brannon, E.L.; National Science Foundation (U.S.)

    2002-08-01T23:59:59.000Z

    The population structure of chinook salmon and steelhead trout is presented as an assimilation of the life history forms that have evolved in synchrony with diverse and complex environments over their Pacific range. As poikilotherms, temperature is described as the overwhelming environmental influence that determines what life history options occur and where they are distributed. The different populations represent ecological types referred to as spring-, summer-, fall, and winter-run segments, as well as stream- and ocean-type, or stream- and ocean-maturing life history forms. However, they are more correctly described as a continuum of forms that fall along a temporal cline related to incubation and rearing temperatures that determine spawn timing and juvenile residence patterns. Once new habitats are colonized, members of the founding populations spread through adaptive evolution to assume complementary life history strategies. The related population units are collectively referred to as a metapopulation, and members most closely associated within common temporal and geographic boundaries are designated as first-order metapopulations. Population structure of chinook salmon and steelhead in the Columbia Basin, therefore, is the reflection of the genetic composition of the founding source or sources within the respective region, shaped by the environment, principally temperature, that defines life history evolutionary strategy to maximize fitness under the conditions delineated. The complexity of structure rests with the diversity of opportunities over the elevations that exist within the Basin. Consistent with natural selection, rather than simply attempting to preserve populations, the challenge is to provide opportunities to expand their range to new or restored habitat that can accommodate genetic adaptation as directional environmental changes are elaborated. Artificial propagation can have a critical role in this process, and the emphasis must be placed on promoting the ability for anadromous salmonids to respond to change by assuring that the genetic diversity to facilitate such responses is present. The key in developing an effective recovery program for chinook salmon and steelhead is to recognize that multiple life history forms associated with temperature characterize the species in the Columbia Basin, and recovery measures taken must address the biological requirements of the population unit within the environmental template identified. Unless such measures are given first and highest priority, establishment of biologically self-sustaining populations will be restrained.

  11. Effect of acylation on the interaction of the N-Terminal segment of pulmonary surfactant protein SP-C with phospholipid membranes

    E-Print Network [OSTI]

    Pompeu Fabra, Universitat

    Effect of acylation on the interaction of the N-Terminal segment of pulmonary surfactant protein SP consists of a hydrophobic transmembrane -helix and a cationic N-terminal segment containing palmitoylated cysteines.Recent evidence suggests thatthe N-terminal segment is of critical importance for SP-C function

  12. Comparative analysis of nonlinear dimensionality reduction techniques for breast MRI segmentation

    SciTech Connect (OSTI)

    Akhbardeh, Alireza; Jacobs, Michael A. [Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 (United States); Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 (United States) and Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 (United States)

    2012-04-15T23:59:59.000Z

    Purpose: Visualization of anatomical structures using radiological imaging methods is an important tool in medicine to differentiate normal from pathological tissue and can generate large amounts of data for a radiologist to read. Integrating these large data sets is difficult and time-consuming. A new approach uses both supervised and unsupervised advanced machine learning techniques to visualize and segment radiological data. This study describes the application of a novel hybrid scheme, based on combining wavelet transform and nonlinear dimensionality reduction (NLDR) methods, to breast magnetic resonance imaging (MRI) data using three well-established NLDR techniques, namely, ISOMAP, local linear embedding (LLE), and diffusion maps (DfM), to perform a comparative performance analysis. Methods: Twenty-five breast lesion subjects were scanned using a 3T scanner. MRI sequences used were T1-weighted, T2-weighted, diffusion-weighted imaging (DWI), and dynamic contrast-enhanced (DCE) imaging. The hybrid scheme consisted of two steps: preprocessing and postprocessing of the data. The preprocessing step was applied for B{sub 1} inhomogeneity correction, image registration, and wavelet-based image compression to match and denoise the data. In the postprocessing step, MRI parameters were considered data dimensions and the NLDR-based hybrid approach was applied to integrate the MRI parameters into a single image, termed the embedded image. This was achieved by mapping all pixel intensities from the higher dimension to a lower dimensional (embedded) space. For validation, the authors compared the hybrid NLDR with linear methods of principal component analysis (PCA) and multidimensional scaling (MDS) using synthetic data. For the clinical application, the authors used breast MRI data, comparison was performed using the postcontrast DCE MRI image and evaluating the congruence of the segmented lesions. Results: The NLDR-based hybrid approach was able to define and segment both synthetic and clinical data. In the synthetic data, the authors demonstrated the performance of the NLDR method compared with conventional linear DR methods. The NLDR approach enabled successful segmentation of the structures, whereas, in most cases, PCA and MDS failed. The NLDR approach was able to segment different breast tissue types with a high accuracy and the embedded image of the breast MRI data demonstrated fuzzy boundaries between the different types of breast tissue, i.e., fatty, glandular, and tissue with lesions (>86%). Conclusions: The proposed hybrid NLDR methods were able to segment clinical breast data with a high accuracy and construct an embedded image that visualized the contribution of different radiological parameters.

  13. Unveiling the counter-rotating nature of the kinematically distinct core in NGC5813 with MUSE

    E-Print Network [OSTI]

    Krajnovic, Davor; Urrutia, Tanya; Emsellem, Eric; Carollo, C Marcella; Shirazi, Maryam; Bacon, Roland; Contini, Thierry; Epinat, Benoit; Kamann, Sebastian; Martinsson, Thomas; Steinmetz, Matthias

    2015-01-01T23:59:59.000Z

    MUSE observations of NGC5813 reveal a complex structure in the velocity dispersion map, previously hinted by SAURON observations. The structure is reminiscent of velocity dispersion maps of galaxies comprising two counter-rotating discs, and may explain the existence of the kinematically distinct core (KDC). Further evidence for two counter-rotating components comes from the analysis of the higher moments of the stellar line-of-sight velocity distributions and fitting MUSE spectra with two separate Gaussian line-of-sight velocity distributions. The emission-line kinematics show evidence of being linked to the present cooling flows and the buoyant cavities seen in X-rays. We detect ionised gas in a nuclear disc-like structure, oriented like the KDC, which is, however, not directly related to the KDC. We build an axisymmetric Schwarzschild dynamical model, which shows that the MUSE kinematics can be reproduced well with two counter-rotating orbit families, characterised by relatively low angular momentum compon...

  14. On Relative Stabilities of Distinct Polyenes. An Extension of the Concept of Conjugated Paths

    E-Print Network [OSTI]

    Gineityte, Viktorija

    2015-01-01T23:59:59.000Z

    The study continues the previous development [MATCH, 72 (2014) 39-73] of the perturbative approach to relative stabilities of pi-electron systems of conjugated hydrocarbons modeled as sets of weakly-interacting initially-double (C=C) bonds. Distinct isomers of acyclic hydrocarbons (polyenes) are now under focus. The relevant total pi-electron energies (E) are expressed in the form of power series containing members (E_(k)) of even orders (k=0,2,4,...) with respect to the averaged resonance parameter of initially-single (C-C) bonds. Terms to within the sixth order (k=6) inclusive are shown to be of importance for discrimination between similar isomers. In this connection, missing expressions for corrections E_(6) are originally derived. Conjugated paths of various lengths (i.e. linear chains consisting of C=C and C-C bonds alternately) are shown to be the most important (but not the only) fragments contributing to stabilization of any acyclic pi-electron system. Again, new types of fragments (substructures) ar...

  15. Genetic Diversity and Population Structure of the Arabian Horse Populations from Syria and other Countries

    E-Print Network [OSTI]

    Khanshour, Anas M

    2013-07-05T23:59:59.000Z

    different populations of Arabians representing Middle Eastern and Western populations. The main two aims of this study were to provide the genetic diversity description of Arabians from different origins and to examine the traditional classification system...

  16. Reversing Wolbachia-based population replacement

    E-Print Network [OSTI]

    Dobson, Stephen L.

    Wolbachia bacteria as a vehicle for population replace- ment. Also discussed are strategies strategies and provide mechan- isms for the autonomous spread of desired transgenes into the targeted relative to the natural population [15­17]. Primary candidates for gene-drive strategies are autonomous

  17. Population density of San Joaquin kit fox

    SciTech Connect (OSTI)

    McCue, P.; O'Farrell, T.P.; Kato, T.; Evans, B.G.

    1982-01-01T23:59:59.000Z

    Populations of the endangered San Joaquin kit fox, vulpes macrotis mutica, are known to occur on the Elk Hills Naval Petroleum Reserve No. 1. This study assess the impact of intensified petroleum exploration and production and associated human activities on kit fox population density. (ACR)

  18. Calculating Evolutionary Dynamics in Structured Populations

    E-Print Network [OSTI]

    Nowak, Martin A.

    Calculating Evolutionary Dynamics in Structured Populations Charles G. Nathanson1. , Corina E. Here we provide a general formula for calculating evolutionary dynamics in a wide class of structured) Calculating Evolutionary Dynamics in Structured Populations. PLoS Comput Biol 5(12): e1000615. doi:10

  19. Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons

    E-Print Network [OSTI]

    Yannouleas, Constantine; Landman, Uzi

    2015-01-01T23:59:59.000Z

    Graphene's isolation launched explorations of fundamental relativistic physics originating from the planar honeycomb lattice arrangement of the carbon atoms, and of potential technological applications in nanoscale electronics. Bottom-up fabricated atomically-precise segmented graphene nanoribbons, SGNRs, open avenues for studies of electrical transport, coherence, and interference effects in metallic, semiconducting, and mixed GNRs, with different edge terminations. Conceptual and practical understanding of electric transport through SGNRs is gained through nonequilibrium Green's function (NEGF) conductance calculations and a Dirac continuum model that absorbs the valence-to-conductance energy gaps as position-dependent masses, including topological-in-origin mass-barriers at the contacts between segments. The continuum model reproduces the NEGF results, including optical Dirac Fabry-Perot (FP) equidistant oscillations for massless relativistic carriers in metallic armchair SGNRs, and an unequally-spaced FP ...

  20. Development and analysis of a linearly segmented CPC collector for industrial steam generation

    SciTech Connect (OSTI)

    Figueroa, J.A.A.

    1980-06-01T23:59:59.000Z

    This study involves the design, analysis and construction of a modular, non-imaging, trough, concentrating solar collector for generation of process steam in a tropical climate. The most innovative feature of this concentrator is that the mirror surface consists of long and narrow planar segments placed inside sealed low-cost glass tubes. The absorber is a cylindrical fin inside an evacuated glass tube. As an extension of the same study, the optical efficiency of the segmented concentrator has been simulated by means of a Monte-Carlo Ray-Tracing program. Laser Ray-Tracing techniques were also used to evaluate the possibilities of this new concept. A preliminary evaluation of the experimental concentrator was done using a relatively simple method that combines results from two experimental measurements: overall heat loss coefficient and optical efficiency. A transient behaviour test was used to measure the overall heat loss coefficient throughout a wide range of temperatures.

  1. Support pedestals for interconnecting a cover and nozzle band wall in a gas turbine nozzle segment

    DOE Patents [OSTI]

    Yu, Yufeng Phillip (Simpsonville, SC); Itzel, Gary Michael (Simpsonville, SC); Webbon, Waylon Willard (Greenville, SC); Bagepalli, Radhakrishna (Schenectady, NY); Burdgick, Steven Sebastian (Schenectady, NY); Kellock, Iain Robertson (Simpsonville, SC)

    2002-01-01T23:59:59.000Z

    A gas turbine nozzle segment has outer and inner band portions. Each band portion includes a nozzle wall, a cover and an impingement plate between the cover and nozzle wall defining two cavities on opposite sides of the impingement plate. Cooling steam is supplied to one cavity for flow through the apertures of the impingement plate to cool the nozzle wall. Structural pedestals interconnect the cover and nozzle wall and pass through holes in the impingement plate to reduce localized stress otherwise resulting from a difference in pressure within the chamber of the nozzle segment and the hot gas path and the fixed turbine casing surrounding the nozzle stage. The pedestals may be cast or welded to the cover and nozzle wall.

  2. Apparatus and methods for impingement cooling of a side wall of a turbine nozzle segment

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01T23:59:59.000Z

    A gas turbine nozzle segment has outer and inner bands and a vane therebetween. Each band includes a nozzle wall, a side wall, a cover and an impingement plate between the cover and the nozzle wall defining two cavities on opposite sides of the impingement plate. Cooling steam is supplied to one cavity for flow through apertures of the impingement plate to cool the nozzle wall. The side wall of the band and inturned flange define with the nozzle wall an undercut region. The impingement plate has a turned flange welded to the inturned flange. A backing plate overlies the turned flange and aligned apertures are formed through the backing plate and turned flange to direct and focus cooling flow onto the side wall of the nozzle segment.

  3. Population genomics20-02-2009 Antnio Rodrigues; Bruno Santos / 59 Population Genomics

    E-Print Network [OSTI]

    Goldschmidt, Christina

    Population genomics20-02-2009 António Rodrigues; Bruno Santos / 59 Population Genomics 1 António Rodrigues (PDBC 2008) Bruno Santos (PDBC 2008) #12;Population genomics20-02-2009 António Rodrigues; Bruno Santos / 59 Contents 2 2 1000 genome project 1 Motivation and Introduction New generation sequencing

  4. POPULATION ECOLOGY Population Dynamics of the Colorado Potato Beetle in an

    E-Print Network [OSTI]

    POPULATION ECOLOGY Population Dynamics of the Colorado Potato Beetle in an Agroecosystem with Tomatoes and Potatoes with Management Implications to Processing Tomatoes CHRIS L. HARDING,1 S. J Environ. Entomol. 31(6): 1110Ð1118 (2002) ABSTRACT We evaluated the population dynamics of Colorado potato

  5. A Fuzzy View on k-Means Based Signal Quantization with Application in Iris Segmentation

    E-Print Network [OSTI]

    Popescu-Bodorin, Nicolaie

    2011-01-01T23:59:59.000Z

    This paper shows that the k-means quantization of a signal can be interpreted both as a crisp indicator function and as a fuzzy membership assignment describing fuzzy clusters and fuzzy boundaries. Combined crisp and fuzzy indicator functions are defined here as natural generalizations of the ordinary crisp and fuzzy indicator functions, respectively. An application to iris segmentation is presented together with a demo program.

  6. Method of joining a vane cavity insert to a nozzle segment of a gas turbine

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01T23:59:59.000Z

    An insert containing apertures for impingement cooling a nozzle vane of a nozzle segment in a gas turbine is inserted into one end of the vane. The leading end of the insert is positioned slightly past a rib adjacent the opposite end of the vane through which the insert is inserted. The end of the insert is formed or swaged into conformance with the inner margin of the rib. The insert is then brazed or welded to the rib.

  7. GDP Formulation of a segmented CDU Swing Cut Model for Refinery Planning

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 GDP Formulation of a segmented CDU Swing Cut Model for Refinery Planning Department of Chemical · Refinery planning is an active area in process systems that strongly relies on the accuracy of the CDU REFINERY FUEL RG LPG LN HN KN GO1 GO2 VGO VR1 VR2 C1 LPG LIGHT NAPHTHA PMS 98 MOGAS 95 JET FUEL AGO HGO HFO

  8. Automatic Evaluation of Brain MR Segmentation Techniques by Level of Sylvain Bouix1,2

    E-Print Network [OSTI]

    Automatic Evaluation of Brain MR Segmentation Techniques by Level of Agreement Sylvain Bouix1 of 40 pairs of MR volumes acquired on a GE 1.5T scanner. The first volume is a 0.9375x0.9375x1.5mm SPGR,2 , Marcos Martin-Fernandez2 , Lida Ungar1 , Martha E. Shenton1 , Robert W. McCarley1 1 Dept of Psychiatry

  9. Simultaneous hierarchical segmentation and vectorization of satellite images through combined data sampling and anisotropic triangulation

    SciTech Connect (OSTI)

    Grazzini, Jacopo [Los Alamos National Laboratory; Prasad, Lakshman [Los Alamos National Laboratory; Dillard, Scott [PNNL

    2010-10-21T23:59:59.000Z

    The automatic detection, recognition , and segmentation of object classes in remote sensed images is of crucial importance for scene interpretation and understanding. However, it is a difficult task because of the high variability of satellite data. Indeed, the observed scenes usually exhibit a high degree of complexity, where complexity refers to the large variety of pictorial representations of objects with the same semantic meaning and also to the extensive amount of available det.ails. Therefore, there is still a strong demand for robust techniques for automatic information extraction and interpretation of satellite images. In parallel, there is a growing interest in techniques that can extract vector features directly from such imagery. In this paper, we investigate the problem of automatic hierarchical segmentation and vectorization of multispectral satellite images. We propose a new algorithm composed of the following steps: (i) a non-uniform sampling scheme extracting most salient pixels in the image, (ii) an anisotropic triangulation constrained by the sampled pixels taking into account both strength and directionality of local structures present in the image, (iii) a polygonal grouping scheme merging, through techniques based on perceptual information , the obtained segments to a smaller quantity of superior vectorial objects. Besides its computational efficiency, this approach provides a meaningful polygonal representation for subsequent image analysis and/or interpretation.

  10. Transport of ions in a segmented linear Paul trap in printed-circuit-board technology

    E-Print Network [OSTI]

    G. Huber; T. Deuschle; W. Schnitzler; R. Reichle; K. Singer; F. Schmidt-Kaler

    2007-11-19T23:59:59.000Z

    We describe the construction and operation of a segmented linear Paul trap, fabricated in printed-circuit-board technology with an electrode segment width of 500 microns. We prove the applicability of this technology to reliable ion trapping and report the observation of Doppler cooled ion crystals of Ca-40 with this kind of traps. Measured trap frequencies agree with numerical simulations at the level of a few percent from which we infer a high fabrication accuracy of the segmented trap. To demonstrate its usefulness and versatility for trapped ion experiments we study the fast transport of a single ion. Our experimental results show a success rate of 99.0(1)% for a transport distance of 2x2mm in a round-trip time of T=20us, which corresponds to 4 axial oscillations only. We theoretically and experimentally investigate the excitation of oscillations caused by fast ion transports with error-function voltage ramps: For a slightly slower transport (a round-trip shuttle within T=30us) we observe non-adiabatic motional excitation of 0.89(15)meV.

  11. New Embolization Microcoil Consisting of Firm and Flexible Segments: Preliminary Clinical Experience

    SciTech Connect (OSTI)

    Irie, Toshiyuki [Hitachi General Hospital, Department of Radiology (Japan)], E-mail: toshiyuki.irie@ibabyo.hitachi.co.jp

    2006-12-15T23:59:59.000Z

    Purpose. To describe the preliminary clinical experience with a new embolization microcoil. Methods. The microcoil was made of a platinum coil spring, and consisted of firm and flexible segments. The firm segment functioned as an anchor and the flexible segment was well compacted to occlude the arteries. No Dacron fiber was attached. Seventy-one new microcoils were placed via microcatheters in 28 visceral arteries of 17 patients. Two other types of microcoils with Dacron fibers were used together in 8 arteries. Results. Sixty-nine new microcoils were placed and compacted successfully. Two coils were misplaced; one was retrieved and the other was left in the migrated artery, which remained patent 5 months later. All 28 arteries were occluded, and the goals of intervention were achieved successfully in all 17 cases. Conclusion. The new microcoils anchored and compacted well in the arteries. The clinical feasibility of this coil design was confirmed. The additional use of other types of microcoils with Dacron fiber was necessary to obtain rapid occlusion in some cases.

  12. Geomechanical Simulations of CO2 Storage Integrity using the Livermore Distinct Element Method

    SciTech Connect (OSTI)

    Morris, J P; Johnson, S M; Friedmann, S J

    2008-07-11T23:59:59.000Z

    Large-scale carbon capture and sequestration (CCS) projects involving annual injections of millions of tons of CO{sub 2} are a key infrastructural element needed to substantially reduce greenhouse gas emissions. The large rate and volume of injection will induce pressure and stress gradients within the formation that could activate existing fractures and faults, or drive new fractures through the caprock. We will present results of an ongoing investigation to identify conditions that will activate existing fractures/faults or make new fractures within the caprock using the Livermore Distinct Element Code (LDEC). LDEC is a multiphysics code, developed at LLNL, capable of simulating dynamic fracture of rock masses under a range of conditions. As part of a recent project, LDEC has been extended to consider fault activation and dynamic fracture of rock masses due to pressurization of the pore-space. We will present several demonstrations of LDEC functionality and applications of LDEC to CO{sub 2} injection scenarios including injection into an extensively fractured rockmass. These examples highlight the advantages of explicitly including the geomechanical response of each interface within the rockmass. We present results from our investigations of Teapot Dome using LDEC to study the potential for fault activation during injection. Using this approach, we built finite element models of the rock masses surrounding bounding faults and explicitly simulated the compression and shear on the fault interface. A CO{sub 2} injection source was introduced and the area of fault activation was predicted as a function of injection rate. This work presents an approach where the interactions of all locations on the fault are considered in response to specific injection scenarios. For example, with LDEC, as regions of the fault fail, the shear load is taken up elsewhere on the fault. The results of this study are consistent with previous studies of Teapot Dome and indicate significantly elevated pore pressures are required to activate the bounding faults, given the assumed in situ stress state on the faults.

  13. Ovarian carcinomas with genetic and epigenetic BRCA1 loss have distinct molecular abnormalities

    SciTech Connect (OSTI)

    Gilks, C. Blake; Press, Joshua Z.; De Luca, Alessandro; Boyd, Niki; Young, Sean; Troussard, Armelle; Ridge, Yolanda; Kaurah, Pardeep; Kalloger, Steve E.; Blood, Katherine A.; Smith, Margaret; Spellman, Paul T.; Wang, Yuker; Miller, Dianne M.; Horsman, Doug; Faham, Malek; Gilks, C. Blake; Gray, Joe; Huntsman, David G.

    2008-05-02T23:59:59.000Z

    Subclassification of ovarian carcinomas can be used to guide treatment and determine prognosis. Germline and somatic mutations, loss of heterozygosity (LOH), and epigenetic events such as promoter hypermethylation can lead to decreased expression of BRCA1/2 in ovarian cancers. The mechanism of BRCA1/2 loss is a potential method of subclassifying high grade serous carcinomas. A consecutive series of 49 ovarian cancers was assessed for mutations status of BRCA1 and BRCA2, LOH at the BRCA1 and BRCA2 loci, methylation of the BRCA1 promoter, BRCA1, BRCA2, PTEN, and PIK3CA transcript levels, PIK3CA gene copy number, and BRCA1, p21, p53, and WT-1 immunohistochemistry. Eighteen (37%) of the ovarian carcinomas had germline or somatic BRCA1 mutations, or epigenetic loss of BRCA1. All of these tumors were high-grade serous or undifferentiated type. None of the endometrioid (n=5), clear cell (n=4), or low grade serous (n=2) carcinomas showed loss of BRCA1, whereas 47% of the 38 high-grade serous or undifferentiated carcinomas had loss of BRCA1. It was possible to distinguish high grade serous carcinomas with BRCA1 mutations from those with epigenetic BRCA1 loss: tumors with BRCA1 mutations typically had decreased PTEN mRNA levels while those with epigenetic loss of BRCA1 had copy number gain of PIK3CA. Overexpression of p53 with loss of p21 expression occurred significantly more frequently in high grade serous carcinomas with epigenetic loss of BRCA1, compared to high grade serous tumors without loss of BRCA1. High grade serous carcinomas can be subclassified into three groups: BRCA1 loss (genetic), BRCA1 loss (epigenetic), and no BRCA1 loss. Tumors in these groups show distinct molecular alterations involving the PI3K/AKT and p53 pathways.

  14. Distinctive Oxidative Stress Responses to Hydrogen Peroxide in Sulfate Reducing Bacteria Desulfovibrio vulgaris Hildenborough

    SciTech Connect (OSTI)

    Zhou, Aifen; He, Zhili; Redding, A.M.; Mukhopadhyay, Aindrila; Hemme, Christopher L.; Joachimiak, Marcin P.; Bender, Kelly S.; Keasling, Jay D.; Stahl, David A.; Fields, Matthew W.; Hazen, Terry C.; Arkin, Adam P.; Wall, Judy D.; Zhou, Jizhong

    2009-01-01T23:59:59.000Z

    Response of Desulfovibrio vulgaris Hildenborough to hydrogen peroxide (H2O2, 1 mM) was investigated with transcriptomic, proteomic and genetic approaches. Microarray data demonstrated that gene expression was extensively affected by H2O2 with the response peaking at 120 min after H2O2 treatment. Genes affected include those involved with energy production, sulfate reduction, ribosomal structure and translation, H2O2 scavenging, posttranslational modification and DNA repair as evidenced by gene coexpression networks generated via a random matrix-theory based approach. Data from this study support the hypothesis that both PerR and Fur play important roles in H2O2-induced oxidative stress response. First, both PerR and Fur regulon genes were significantly up-regulated. Second, predicted PerR regulon genes ahpC and rbr2 were derepressedin Delta PerR and Delta Fur mutants and induction of neither gene was observed in both Delta PerR and Delta Fur when challenged with peroxide, suggesting possible overlap of these regulons. Third, both Delta PerR and Delta Fur appeared to be more tolerant of H2O2 as measured by optical density. Forth, proteomics data suggested de-repression of Fur during the oxidative stress response. In terms of the intracellular enzymatic H2O2 scavenging, gene expression data suggested that Rdl and Rbr2 may play major roles in the detoxification of H2O2. In addition, induction of thioredoxin reductase and thioredoxin appeared to be independent of PerR and Fur. Considering all data together, D. vulgaris employed a distinctive stress resistance mechanism to defend against increased cellular H2O2, and the temporal gene expression changes were consistent with the slowdown of cell growth at the onset of oxidative stress.

  15. Energy Conservation Through Demand-Side Management (DSM): A Methodology to Characterize Energy Use Among commercial Market Segments

    E-Print Network [OSTI]

    Grosskopf, K. R.; Oppenheim, P.; Barclay, D

    2007-01-01T23:59:59.000Z

    use intensity (kWh/sf/yr), load factor and many other energy use characteristics for each market segment. From this information, lower tier performers in each NAICS submarket can be identified and appropriate DSM alternatives selected specific to each....

  16. Thermal segmentation along the N. EcuadorS. Colombia margin (14N): Prominent influence of sedimentation rate in the trench

    E-Print Network [OSTI]

    Vallée, Martin

    Thermal segmentation along the N. Ecuador­S. Colombia margin (1­4°N): Prominent influence Ecuador Colombia Along the deformation front of the North Ecuador­South Colombia (NESC) margin, both

  17. Abstract--In this paper we propose a new hybrid image segmentation algorithm that integrate the region-based

    E-Print Network [OSTI]

    Duan, Ye

    show the new algorithm can achieve very good segmentation results. Figure 1. Flow chart attempt to align an initial deform- able boundary with the object boundary by minimizing an energy

  18. Calibration of Silver Plasmon Rulers in the 1-25 nm Separation Range: Experimental Indications of Distinct Plasmon Coupling Regimes

    E-Print Network [OSTI]

    Calibration of Silver Plasmon Rulers in the 1-25 nm Separation Range: Experimental Indications of Distinct Plasmon Coupling Regimes Linglu Yang, Hongyun Wang, Bo Yan, and Bjo¨rn M. Reinhard* Department nanoparticles, so-called silver plasmon rulers, are synthesized with use of a rational DNA programmed self

  19. Mineral Maturity and Crystallinity Index Are Distinct Characteristics of Bone D. Farlay, G. Panczer, C. Rey, P. D. Delmas

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Mineral Maturity and Crystallinity Index Are Distinct Characteristics of Bone Mineral D. Farlay, G in "Journal of Bone and Mineral Metabolism 2010;28(4):433-45" DOI : 10.1007/s00774-009-0146-7 #12;Abstract The purpose of this study was to test the hypothesis that mineral maturity and crystallinity index are two

  20. Tests of scaling and universality of the distributions of trade size and share volume: Evidence from three distinct markets

    E-Print Network [OSTI]

    Stanley, H. Eugene

    from three distinct markets Vasiliki Plerou and H. Eugene Stanley Center for Polymer Studies stock prices. Prior analysis of intraday stock returns data for both indi- ces and single stocks shows markets: i 1000 major U.S. stocks for the 2-y period 1994­1995, ii 85 major U.K. stocks for the 2-y period

  1. A Distinctive Energy Policy for Scotland? The Impact of Low Carbon Generation on the Future Price of

    E-Print Network [OSTI]

    Mottram, Nigel

    A Distinctive Energy Policy for Scotland? The Impact of Low Carbon Generation on the Future Price climate change, improved security of supply, affordable energy prices and a stimulus to economic growth of Allander Institute, supported by PricewaterhouseCoopers and published 19th June 2008 explore current energy

  2. DISTINCT PATTERNS OF NITRATE REDUCTASE ACTIVITY IN BROWN ALGAE: LIGHT AND AMMONIUM SENSITIVITY IN LAMINARIA DIGITATA IS ABSENT IN

    E-Print Network [OSTI]

    Berges, John A.

    DISTINCT PATTERNS OF NITRATE REDUCTASE ACTIVITY IN BROWN ALGAE: LIGHT AND AMMONIUM SENSITIVITY and lowest in summer. This is the first report of NR activity in any alga that is not strongly regulated the regulation of NR by light that has been observed in other algae and higher plants. Key index words: ammonium

  3. Detailed Hydration Maps of Benzene and Cyclohexane Reveal Distinct Water Structures Tanya M. Raschke* and Michael Levitt

    E-Print Network [OSTI]

    Raschke, Tanya M.

    Detailed Hydration Maps of Benzene and Cyclohexane Reveal Distinct Water Structures Tanya M of the hydrophobic solutes benzene and cyclohexane were investigated using molecular dynamics (MD) simulations O and H atoms surrounding either benzene or cyclohexane were generated from the simulation data. MD

  4. Distinct Ultraviolet-Signaling Pathways in Bean Leaves. DNA Damage Is Associated with -1,3-Glucanase Gene

    E-Print Network [OSTI]

    Leubner, Gerhard

    Distinct Ultraviolet-Signaling Pathways in Bean Leaves. DNA Damage Is Associated with -1 (UV-B; 280­320 nm) radiation in primary leaves of French bean (Phaseolus vulgaris to the expression of bean class I Glu ( Glu I). In contrast to other proteins of the family of pathogenesis

  5. Estimating Traveler Populations at Airport and Cruise Terminals for Population Distribution and Dynamics

    SciTech Connect (OSTI)

    Jochem, Warren C [ORNL; Sims, Kelly M [ORNL; Bright, Eddie A [ORNL; Urban, Marie L [ORNL; Rose, Amy N [ORNL; Coleman, Phil R [ORNL; Bhaduri, Budhendra L [ORNL

    2013-01-01T23:59:59.000Z

    In recent years, uses of high-resolution population distribution databases are increasing steadily for environmental, socioeconomic, public health, and disaster-related research and operations. With the development of daytime population distribution, temporal resolution of such databases has been improved. However, the lack of incorporation of transitional population, namely business and leisure travelers, leaves a significant population unaccounted for within the critical infrastructure networks, such as at transportation hubs. This paper presents two general methodologies for estimating passenger populations in airport and cruise port terminals at a high temporal resolution which can be incorporated into existing population distribution models. The methodologies are geographically scalable and are based on, and demonstrate how, two different transportation hubs with disparate temporal population dynamics can be modeled utilizing publicly available databases including novel data sources of flight activity from the Internet which are updated in near-real time. The airport population estimation model shows great potential for rapid implementation for a large collection of airports on a national scale, and the results suggest reasonable accuracy in the estimated passenger traffic. By incorporating population dynamics at high temporal resolutions into population distribution models, we hope to improve the estimates of populations exposed to or at risk to disasters, thereby improving emergency planning and response, and leading to more informed policy decisions.

  6. Serialisation du k-means pour la segmentation des images en couleur: Application aux images de documents et autres

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    S´erialisation du k-means pour la segmentation des images en couleur: Application aux images de'analyse d'images de documents en couleur. Cette m´ethode est bas´ee sur une s´erialisation de l'algorithme k-means´erialisation de l'algorithme k-means Les m´ethodes de segmentation adaptatives sont g´en´eralement celles qui

  7. Superharmonic nonlinear lateral vibrations of a segmented driveline incorporating a tuned damper excited by non-constant velocity joints

    E-Print Network [OSTI]

    Browne, Michael

    2010-07-14T23:59:59.000Z

    SUPERHARMONIC NONLINEAR LATERAL VIBRATIONS OF A SEGMENTED DRIVELINE INCORPORATING A TUNED DAMPER EXCITED BY NON-CONSTANT VELOCITY JOINTS A Dissertation by MICHAEL SCOTT BROWNE Submitted to the Office of Graduate Studies... of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2009 Major Subject: Mechanical Engineering SUPERHARMONIC NONLINEAR LATERAL VIBRATIONS OF A SEGMENTED DRIVELINE INCORPORATING A...

  8. Energy Systems and Population Health

    SciTech Connect (OSTI)

    Ezzati, Majid; Bailis, Rob; Kammen, Daniel M.; Holloway, Tracey; Price, Lynn; Cifuentes, Luis A.; Barnes, Brendon; Chaurey, Akanksha; Dhanapala, Kiran N.

    2004-04-12T23:59:59.000Z

    It is well-documented that energy and energy systems have a central role in social and economic development and human welfare at all scales, from household and community to regional and national (41). Among its various welfare effects, energy is closely linked with people s health. Some of the effects of energy on health and welfare are direct. With abundant energy, more food or more frequent meals can be prepared; food can be refrigerated, increasing the types of food items that are consumed and reducing food contamination; water pumps can provide more water and eliminate the need for water storage leading to contamination or increased exposure to disease vectors such as mosquitoes or snails; water can be disinfected by boiling or using other technologies such as radiation. Other effects of energy on public health are mediated through more proximal determinants of health and disease. Abundant energy can lead to increased irrigation, agricultural productivity, and access to food and nutrition; access to energy can also increase small-scale income generation such as processing of agricultural commodities (e.g., producing refined oil from oil seeds, roasting coffee, drying and preserving fruits and meats) and production of crafts; ability to control lighting and heating allows education or economic activities to be shielded from daily or seasonal environmental constraints such as light, temperature, rainfall, or wind; time and other economic resources spent on collecting and/or transporting fuels can be used for other household needs if access to energy is facilitated; energy availability for transportation increases access to health and education facilities and allow increased economic activity by facilitating the transportation of goods and services to and from markets; energy for telecommunication technology (radio, television, telephone, or internet) provides increased access to information useful for health, education, or economic purposes; provision of energy to rural and urban health facilities allows increased delivery and coverage of 3 various health services and interventions such as tests and treatments, better storage of medicine and vaccines, disinfection of medical equipment by boiling or radiation, and more frequent and efficient health system encounters through mobile clinics or longer working hours; and so on. In fact, while the dominant view of development-energy-health linkages has been that improvements in energy and health are outcomes of the socioeconomic development process (e.g., the ''energy ladder'' framework discussed below), it has even been argued that access to higher quality energy sources and technologies can initiate a chain of demographic, health, and development outcomes by changing the household structure and socioeconomic relationships. For example, in addition to increased opportunities for food and income production, reduced infant mortality as a result of transition to cleaner fuels or increased coverage of vaccination with availability of refrigerators in rural clinics may initiate a process of ''demographic transition'' to low-mortality and low-fertility populations (14). Such a transition has historically been followed with further improvements in maternal and child health and increased female participation in the labor markets and other economic activities.

  9. Population dynamics of the Concho water snake

    E-Print Network [OSTI]

    Mueller, James Michael

    1990-01-01T23:59:59.000Z

    on the Colorado River, Texas 24 14 Model A' estimates and standard errors for the 1987 age class of a Concho water snake population at the lower Elm Creek study site, near Ballinger, Texas. 25 15 Model A' estimates and standard errors for the 1988 age class... of a Concha water snake population at the lower Elm Creek study site, near Ballinger, Texas. 25 16 Jolly-Seber estimates and standard errors for the 1988 age class of a Concha water snake population at the upper Elm Creek study site, near Ballinger...

  10. Accounting for population variation in targeted proteomics

    SciTech Connect (OSTI)

    Fujimoto, Grant M.; Monroe, Matthew E.; Rodriguez, Larissa M.; Wu, Chaochao; MacLean, Brendan; Smith, Richard D.; MacCoss, Michael; Payne, Samuel H.

    2014-01-03T23:59:59.000Z

    Individual proteomes typically differ from the reference human proteome at ~10,000 single amino acid variants. When viewed at the population scale, this individual variation results in a wide variety of protein sequences. In targeted proteomics experiments, such variability would confound accurate protein quantification. To facilitate researchers in identifying target peptides with high variability within the human population we have created the Population Variation plug-in for Skyline, which provides easy access to the polymorphisms stored in dbSNP. Given a set of peptides, the tool reports minor allele frequency for common polymorphisms. We highlight the importance of considering genetic variation by applying the tool to public datasets.

  11. Hanford Site Regional Population - 2010 Census

    SciTech Connect (OSTI)

    Hamilton, Erin L.; Snyder, Sandra F.

    2011-08-12T23:59:59.000Z

    The U.S. Department of Energy conducts radiological operations in south-central Washington State. Population dose estimates must be performed to provide a measure of the impact from site radiological releases. Results of the U.S. 2010 Census were used to determine counts and distributions for the residential population located within 50-miles of several operating areas of the Hanford Site. Year 2010 was the first census year that a 50-mile population of a Hanford Site operational area exceeded the half-million mark.

  12. Stellar Populations in Circumnuclear Star Forming Regions

    E-Print Network [OSTI]

    A. I. Diaz; M. Alvarez-Alvarez; M. Castellanos

    2002-05-07T23:59:59.000Z

    We present a study of the stellar populations and gas physical conditions in Circumnuclear Star Forming Regions (CNSFR) based on broad and narrow band photometry and spectrophotometric data, which have been analyzed with the use of evolutionary population synthesis and photoionization models. It is found that most CNSFR show composite stellar populations of slightly different ages. They seem to have the highest abundances in HII region-like objects, showing also N/O overabundances and S/O underabundances by a factor of about three. Also, CNSFR as a class, segregate from the disk HII region family, clustering around smaller $\\eta$' values, and thereforefore higher ionizing temperatures.

  13. Residential Segmentation

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection Technical squestionnairesquestionnaires53 2.370 2.359

  14. Polymer Segmental Cross-Correlations from Dielectric Relaxation Spectra of Block Copolymers

    E-Print Network [OSTI]

    George D. J. Phillies

    2011-02-21T23:59:59.000Z

    Dielectric relaxation spectra of block polymers containing sequential type-A dipoles are considered. Spectra of a specific set of block copolymers can be combined to isolate the dynamic cross-correlation between the motions of two distinct parts of the same polymer chain. Unlike past treatments of this problem, no model is assumed for the underlying polymer dynamics.

  15. Conditions when hybridization might predispose populations

    E-Print Network [OSTI]

    COMMENTARY Conditions when hybridization might predispose populations for adaptive radiation O (Sch- warzer et al., 2012), perhaps just as a consequence of many young species in geographical et al., 2011; Genner & Turner, 2012). Whether these species radiations happen despite hybridization

  16. Method for spatially distributing a population

    DOE Patents [OSTI]

    Bright, Edward A [Knoxville, TN; Bhaduri, Budhendra L [Knoxville, TN; Coleman, Phillip R [Knoxville, TN; Dobson, Jerome E [Lawrence, KS

    2007-07-24T23:59:59.000Z

    A process for spatially distributing a population count within a geographically defined area can include the steps of logically correlating land usages apparent from a geographically defined area to geospatial features in the geographically defined area and allocating portions of the population count to regions of the geographically defined area having the land usages, according to the logical correlation. The process can also include weighing the logical correlation for determining the allocation of portions of the population count and storing the allocated portions within a searchable data store. The logically correlating step can include the step of logically correlating time-based land usages to geospatial features of the geographically defined area. The process can also include obtaining a population count for the geographically defined area, organizing the geographically defined area into a plurality of sectors, and verifying the allocated portions according to direct observation.

  17. Stellar Populations in Bulges of Spiral Galaxies

    E-Print Network [OSTI]

    P. Jablonka; J. Gorgas; P. Goudfrooij

    2002-02-01T23:59:59.000Z

    We have conducted a spectroscopic analysis of the bulges of a sample of 31 spiral galaxies, spanning the Hubble sequence from S0 to Scd type, in order to study the radial distribution of their stellar population properties.

  18. Programmed population control by cellcell communication

    E-Print Network [OSTI]

    You, Lingchong

    that autonomously regulates the density of an Escherichia coli population. The cell density is broadcasted from the marine bacterium Vibrio fischeri13,14 synthesizes a small, diffusible acyl-homoserine lactone

  19. Population dynamic interference among childhood diseases

    E-Print Network [OSTI]

    Rohani, Pejman

    is predicted and cannot be dismissed in the limited case-study data available for measles and whooping cough in England before the vaccination era. Keywords: measles; whooping cough; population dynamics; epidemiology

  20. Dynamics of similar populations Geza Meszena1

    E-Print Network [OSTI]

    Meszéna, Géza

    Dynamics of similar populations G´eza Mesz´ena1 , Mats Gyllenberg2 , Frans J. Jacobs3 , Hans A. J. Metz3,4 1 E¨otv¨os Univerity, Budapest 2 University of Helsinki 3 Leiden University 4 Adaptive Dynamics by population dynamics: dni dt = ri (n1, n2, . . . , nL) ni i = 1, 2, . . . , L ni 0 for losers. Dynamics

  1. X-ray source populations in galaxies

    E-Print Network [OSTI]

    G. Fabbiano

    2005-11-16T23:59:59.000Z

    Today's sensitive, high-resolution X-ray observations allow the study of populations of X-ray sources, in the luminosity range of Galactic X-ray binaries, in galaxies as distant as 20-30 Mpc. The traditional astronomical tools of photometric diagrams and luminosity functions are now applied to these populations, providing a direct probe of the evolved binary component of different stellar populations. The study of the X-ray populations of E and S0 galaxies has revamped the debate on the formation and evolution of low-mass X-ray binaries (LMXBs) and on the role of globular clusters in these processes. While overall stellar mass drives the amount of X-ray binaries in old stellar populations, the amount of sources in star forming galaxies is related to the star formation rate. Short-lived, luminous, high-mass binaries (HMXBs) dominate these young populations. The most luminous sources in these systems are the debated ULXs, which have been suggested to be ~100-1000 Msol black holes, but could alternatively include a number of binaries with stellar mass black holes. Very soft sources have also been discovered in many galaxies and their nature is currently being debated. Observations of the deep X-ray sky, and comparison with deep optical surveys, are providing the first evidence of the X-ray evolution of galaxies.

  2. Texture analysis improves level set segmentation of the anterior abdominal wall

    SciTech Connect (OSTI)

    Xu, Zhoubing [Electrical Engineering, Vanderbilt University, Nashville, Tennessee 37235 (United States)] [Electrical Engineering, Vanderbilt University, Nashville, Tennessee 37235 (United States); Allen, Wade M. [Institute of Imaging Science, Vanderbilt University, Nashville, Tennessee 37235 (United States)] [Institute of Imaging Science, Vanderbilt University, Nashville, Tennessee 37235 (United States); Baucom, Rebeccah B.; Poulose, Benjamin K. [General Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37235 (United States)] [General Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37235 (United States); Landman, Bennett A. [Electrical Engineering, Vanderbilt University, Nashville, Tennessee 37235 and Institute of Imaging Science, Vanderbilt University, Nashville, Tennessee 37235 (United States)] [Electrical Engineering, Vanderbilt University, Nashville, Tennessee 37235 and Institute of Imaging Science, Vanderbilt University, Nashville, Tennessee 37235 (United States)

    2013-12-15T23:59:59.000Z

    Purpose: The treatment of ventral hernias (VH) has been a challenging problem for medical care. Repair of these hernias is fraught with failure; recurrence rates ranging from 24% to 43% have been reported, even with the use of biocompatible mesh. Currently, computed tomography (CT) is used to guide intervention through expert, but qualitative, clinical judgments, notably, quantitative metrics based on image-processing are not used. The authors propose that image segmentation methods to capture the three-dimensional structure of the abdominal wall and its abnormalities will provide a foundation on which to measure geometric properties of hernias and surrounding tissues and, therefore, to optimize intervention.Methods: In this study with 20 clinically acquired CT scans on postoperative patients, the authors demonstrated a novel approach to geometric classification of the abdominal. The authors’ approach uses a texture analysis based on Gabor filters to extract feature vectors and follows a fuzzy c-means clustering method to estimate voxelwise probability memberships for eight clusters. The memberships estimated from the texture analysis are helpful to identify anatomical structures with inhomogeneous intensities. The membership was used to guide the level set evolution, as well as to derive an initial start close to the abdominal wall.Results: Segmentation results on abdominal walls were both quantitatively and qualitatively validated with surface errors based on manually labeled ground truth. Using texture, mean surface errors for the outer surface of the abdominal wall were less than 2 mm, with 91% of the outer surface less than 5 mm away from the manual tracings; errors were significantly greater (2–5 mm) for methods that did not use the texture.Conclusions: The authors’ approach establishes a baseline for characterizing the abdominal wall for improving VH care. Inherent texture patterns in CT scans are helpful to the tissue classification, and texture analysis can improve the level set segmentation around the abdominal region.

  3. Segmented Ultralight Pre-Aligned Rotor for Extreme-Scale Wind Turbines

    SciTech Connect (OSTI)

    Loth, E.; Steele, A.; Ichter, B.; Selig, M.; Moriarty, P.

    2012-01-01T23:59:59.000Z

    To alleviate the mass-scaling issues associated with conventional upwind rotors of extreme-scale turbines, a downwind rotor concept is proposed which employs fixed blade curvature based on force alignment at rated conditions. For a given peak stress constraint, the reduction in downwind cantilever loads allows reduced shell and spar thickness, and thus a reduced blade mass as compared with a conventional upwind rotor, especially as rotor sizes approach extreme-scales. To quantify this mass reduction, a Finite Element Analysis was conducted for a 10 MW rated rotor based on the NREL offshore 5 MW baseline wind turbine. The results show that this 'pre-alignment' yields a net downstream deflection of 32 deg, a downward hub-pitch angle of 6 deg, a 20% increase in blade length (to maintain the same radius as the conventional blade), and a net mass savings of about 50% through decreased shell and spar thicknesses. The pre-alignment may also allow a more straightforward and efficient segmentation of the blade since shear stresses near joints are substantially reduced. Segmenting, in turn, can dramatically reduce costs associated with fabrication, transport and assembly for extreme-scale off-shore systems. The pre-aligned geometric curvature can also help alleviate tower wake effects on the blades since blade tips (where shadow effects can be most problematic) are shifted downstream where the tower wake is weaker. In addition, the portion of the tower that is upstream of the blade tips can be faired with an externally-rotating aerodynamic shroud. Furthermore, the downwind rotor can allow a floating off-shore tri-pod platform to reduce tower weight and yaw-control requirements. A simple economic analysis of the segmented ultralight pre-aligned rotor (SUPAR) concept suggests that the overall system cost savings can be as much as 25%, indicating that more detailed (numerical and experimental) investigations are warranted.

  4. Autonomous Motion Segmentation of Multiple Objects in Low Resolution Video Using Variational Level Sets

    SciTech Connect (OSTI)

    Moelich, M

    2003-11-18T23:59:59.000Z

    This report documents research that was done during a ten week internship in the Sapphire research group at the Lawrence Livermore National Laboratory during the Summer of 2003. The goal of the study was to develop an algorithm that is capable of isolating (segmenting) moving objects in low resolution video sequences. This capability is currently being developed by the Sapphire research group as the first stage in a longer term video data mining project. This report gives a chronological account of what ideas were tried in developing the algorithm and what was learned from each attempt. The final version of the algorithm, which is described in detail, gives good results and is fast.

  5. Electrical Signal Path Study and Component Assay for the MAJORANA N-Type Segmented Contact Detector

    SciTech Connect (OSTI)

    Amman, Mark; Bergevin, Marc; Chan, Yuen-Dat; Detwiler, Jason A.; Fujikawa, Brian .; Lesko, Kevin T.; Luke, Paul N.; Prior, Gersende; Poon, Alan W.; Smith, Alan R.; Vetter, Kai; Yaver, Harold; Zimmermann, Sergio

    2009-02-24T23:59:59.000Z

    The purpose of the present electrical signal path study is to explore the various issues related to the deployment of highly-segmented low-background Ge detectors for the MAJORANA double-beta decay experiment. A significant challenge is to simultaneously satisfy competing requirements for the mechanical design, electrical readout performance, and radiopurity specifications from the MAJORANA project. Common to all rare search experiments, there is a very stringent limit on the acceptable radioactivity level of all the electronics components involved. Some of the findings are summarized in this report.

  6. Odor recognition and segmentation by coupled olfactory bulb and cortical networks

    E-Print Network [OSTI]

    Li, Z; Li, Zhaoping; Hertz, John

    1999-01-01T23:59:59.000Z

    We present a model of a coupled system of the olfactory bulb and cortex. Odor inputs to the epithelium are transformed to oscillatory bulbar activities. The cortex recognizes the odor by resonating to the bulbar oscillating pattern when the amplitude and phase patterns from the bulb match an odor memory stored in the intracortical synapses. We assume a cortical structure which transforms the odor information in the oscillatory pattern to a slow DC feedback signal to the bulb. This feedback suppresses the bulbar response to the pre-existing odor, allowing subsequent odor objects to be segmented out for recognition.

  7. Layered and segmented system organization (LASSO) for highly reliable inventory monitoring systems (IMS)

    SciTech Connect (OSTI)

    Mangan, Dennis L.; Matter, John C.; Waddoups, I. (Ivan); Abhold, M. E. (Mark E.); Chiaro, P. (Peter)

    2002-01-01T23:59:59.000Z

    The Trilateral Initiative is preparing for International Atomic Energy Agency (LUiA) verification of excess fissile material released itom the defense programs of the United States and the Russian Federation. Following acceptance of the material using an Attribute Verification System, the IAEA will depend on an Inventory Monitoring System to maintain Continuity of Knowledge of the large inventory of thousands of items. Recovery fiom a total loss of Continuity of Knowledge in such a large storage facility would involve an extremely costly inventory re-verification This paper presents the framework for a Layered and Segmented System Organization that is the basis for a highly reliable IMS with protection-in-depth.

  8. Synthesis of Poly(3-alkylthiophene)–Poly(arylisocyanide) Diblock Copolymers: Two Mechanistically Distinct, Sequential Living Polymerizations Using a Single Catalyst

    SciTech Connect (OSTI)

    Wu, Zong-Quan; Ono, Robert J.; Chen, Zheng; Bielawski, Christopher W.

    2010-01-01T23:59:59.000Z

    Block copolymers of poly(3-hexylthiophene) and a poly(arylisocyanide) were synthesized in a single pot via the addition of 2-bromo-3-hexyl-5-chloromagnesiothiophene followed by n-decyl 4-isocyanobenzoate to a solution of Ni(1,3-bis(diphenylphosphino)propane)Cl{sub 2}. The respective mechanistically distinct polymerizations proceeded in a controlled fashion and afforded well-defined block copolymers with tunable molecular weights and compositions. The block copolymers exhibited microphase separation characteristics in the solid state.

  9. american mink populations: Topics by E-print Network

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

    of the American mink and a distinct biogeographic radiation of American weasels Environmental Sciences and Ecology Websites Summary: , M. nigripes), Mustela migrant to North...

  10. asian populations levels: Topics by E-print Network

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

    asymptomatic condition, that is widespread in Southeast Asian populations of Malasia, Indonesia, Papua New Guinea (more) Ziervogel, Cheryl Anne 2008-01-01 2 Population Total...

  11. asian population predictors: Topics by E-print Network

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

    asymptomatic condition, that is widespread in Southeast Asian populations of Malasia, Indonesia, Papua New Guinea (more) Ziervogel, Cheryl Anne 2008-01-01 2 Population Total...

  12. asian population modified: Topics by E-print Network

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

    asymptomatic condition, that is widespread in Southeast Asian populations of Malasia, Indonesia, Papua New Guinea (more) Ziervogel, Cheryl Anne 2008-01-01 2 Population Total...

  13. asian population lessons: Topics by E-print Network

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

    asymptomatic condition, that is widespread in Southeast Asian populations of Malasia, Indonesia, Papua New Guinea (more) Ziervogel, Cheryl Anne 2008-01-01 2 Population Total...

  14. asian populations identifies: Topics by E-print Network

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

    asymptomatic condition, that is widespread in Southeast Asian populations of Malasia, Indonesia, Papua New Guinea (more) Ziervogel, Cheryl Anne 2008-01-01 2 Population Total...

  15. active microbial populations: Topics by E-print Network

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

    of enzyme activity Paris-Sud XI, Universit de 2 MICROBIAL POPULATIONS FECAL PELLETS AND Geosciences Websites Summary: MICROBIAL POPULATIONS FECAL PELLETS AND AND...

  16. annual plant populations: Topics by E-print Network

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

    DEMOGRAPHY IN PLANTAGO:VARIATION AMONG COHORTS IN A NATURAL PLANT POPULATION DEBORAH A Roach,. Deborah 67 PLANT-ANIMAL INTERACTIONS -ORIGINAL PAPER Population density of North...

  17. Will China's Vehicle Population Grow Even Faster than Forecasted?

    E-Print Network [OSTI]

    Wang, Yunshi; Teter, Jacob; Sperling, Daniel

    2012-01-01T23:59:59.000Z

    2011. “China’s Soaring Vehicle Population: Even Greater Thanversion, “China’s Soaring Vehicle Population: Even Greater2012. “Modeling Future Vehicle Sales and Stock in China,”

  18. SU-C-9A-03: Simultaneous Deconvolution and Segmentation for PET Tumor Delineation Using a Variational Method

    SciTech Connect (OSTI)

    Li, L; Tan, S [Huazhong University of Science and Technology, Wuhan, Hubei (China); Lu, W; D'Souza, W [University of Maryland School of Medicine, Baltimore, MD (United States)

    2014-06-01T23:59:59.000Z

    Purpose: To implement a new method that integrates deconvolution with segmentation under the variational framework for PET tumor delineation. Methods: Deconvolution and segmentation are both challenging problems in image processing. The partial volume effect (PVE) makes tumor boundaries in PET image blurred which affects the accuracy of tumor segmentation. Deconvolution aims to obtain a PVE-free image, which can help to improve the segmentation accuracy. Conversely, a correct localization of the object boundaries is helpful to estimate the blur kernel, and thus assist in the deconvolution. In this study, we proposed to solve the two problems simultaneously using a variational method so that they can benefit each other. The energy functional consists of a fidelity term and a regularization term, and the blur kernel was limited to be the isotropic Gaussian kernel. We minimized the energy functional by solving the associated Euler-Lagrange equations and taking the derivative with respect to the parameters of the kernel function. An alternate minimization method was used to iterate between segmentation, deconvolution and blur-kernel recovery. The performance of the proposed method was tested on clinic PET images of patients with non-Hodgkin's lymphoma, and compared with seven other segmentation methods using the dice similarity index (DSI) and volume error (VE). Results: Among all segmentation methods, the proposed one (DSI=0.81, VE=0.05) has the highest accuracy, followed by the active contours without edges (DSI=0.81, VE=0.25), while other methods including the Graph Cut and the Mumford-Shah (MS) method have lower accuracy. A visual inspection shows that the proposed method localizes the real tumor contour very well. Conclusion: The result showed that deconvolution and segmentation can contribute to each other. The proposed variational method solve the two problems simultaneously, and leads to a high performance for tumor segmentation in PET. This work was supported in part by National Natural Science Foundation of China (NNSFC), under Grant Nos. 60971112 and 61375018, and Fundamental Research Funds for the Central Universities, under Grant No. 2012QN086. Wei Lu was supported in part by the National Institutes of Health (NIH) Grant No. R01 CA172638.

  19. Automatic segmentation of head and neck CT images for radiotherapy treatment planning using multiple atlases, statistical appearance models, and geodesic active contours

    SciTech Connect (OSTI)

    Fritscher, Karl D., E-mail: Karl.Fritscher@umit.at; Sharp, Gregory [Department for Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts 02114 (United States)] [Department for Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts 02114 (United States); Peroni, Marta [Paul Scherrer Institut, Villigen 5232 (Switzerland)] [Paul Scherrer Institut, Villigen 5232 (Switzerland); Zaffino, Paolo; Spadea, Maria Francesca [Department of Experimental and Clinical Medicine, Magna Graecia University, Catanzaro 88100 (Italy)] [Department of Experimental and Clinical Medicine, Magna Graecia University, Catanzaro 88100 (Italy); Schubert, Rainer [Institute for Biomedical Image Analysis, Private University of Health Sciences, Medical Informatics and Technology, Hall in Tirol 6060 (Austria)] [Institute for Biomedical Image Analysis, Private University of Health Sciences, Medical Informatics and Technology, Hall in Tirol 6060 (Austria)

    2014-05-15T23:59:59.000Z

    Purpose: Accurate delineation of organs at risk (OARs) is a precondition for intensity modulated radiation therapy. However, manual delineation of OARs is time consuming and prone to high interobserver variability. Because of image artifacts and low image contrast between different structures, however, the number of available approaches for autosegmentation of structures in the head-neck area is still rather low. In this project, a new approach for automated segmentation of head-neck CT images that combine the robustness of multiatlas-based segmentation with the flexibility of geodesic active contours and the prior knowledge provided by statistical appearance models is presented. Methods: The presented approach is using an atlas-based segmentation approach in combination with label fusion in order to initialize a segmentation pipeline that is based on using statistical appearance models and geodesic active contours. An anatomically correct approximation of the segmentation result provided by atlas-based segmentation acts as a starting point for an iterative refinement of this approximation. The final segmentation result is based on using model to image registration and geodesic active contours, which are mutually influencing each other. Results: 18 CT images in combination with manually segmented labels of parotid glands and brainstem were used in a leave-one-out cross validation scheme in order to evaluate the presented approach. For this purpose, 50 different statistical appearance models have been created and used for segmentation. Dice coefficient (DC), mean absolute distance and max. Hausdorff distance between the autosegmentation results and expert segmentations were calculated. An average Dice coefficient of DC = 0.81 (right parotid gland), DC = 0.84 (left parotid gland), and DC = 0.86 (brainstem) could be achieved. Conclusions: The presented framework provides accurate segmentation results for three important structures in the head neck area. Compared to a segmentation approach based on using multiple atlases in combination with label fusion, the proposed hybrid approach provided more accurate results within a clinically acceptable amount of time.

  20. Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons

    E-Print Network [OSTI]

    Constantine Yannouleas; Igor Romanovsky; Uzi Landman

    2015-02-01T23:59:59.000Z

    Graphene's isolation launched explorations of fundamental relativistic physics originating from the planar honeycomb lattice arrangement of the carbon atoms, and of potential technological applications in nanoscale electronics. Bottom-up fabricated atomically-precise segmented graphene nanoribbons, SGNRs, open avenues for studies of electrical transport, coherence, and interference effects in metallic, semiconducting, and mixed GNRs, with different edge terminations. Conceptual and practical understanding of electric transport through SGNRs is gained through nonequilibrium Green's function (NEGF) conductance calculations and a Dirac continuum model that absorbs the valence-to-conductance energy gaps as position-dependent masses, including topological-in-origin mass-barriers at the contacts between segments. The continuum model reproduces the NEGF results, including optical Dirac Fabry-Perot (FP) equidistant oscillations for massless relativistic carriers in metallic armchair SGNRs, and an unequally-spaced FP pattern for mixed armchair-zigzag SGNRs where carriers transit from a relativistic (armchair) to a nonrelativistic (zigzag) regime. This provides a unifying framework for analysis of coherent transport phenomena and interpretation of forthcoming experiments in SGNRs.

  1. Vision 20/20: Perspectives on automated image segmentation for radiotherapy

    SciTech Connect (OSTI)

    Sharp, Gregory, E-mail: gcsharp@partners.org; Fritscher, Karl D.; Shusharina, Nadya [Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts 02114 (United States)] [Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts 02114 (United States); Pekar, Vladimir [Philips Healthcare, Markham, Ontario 6LC 2S3 (Canada)] [Philips Healthcare, Markham, Ontario 6LC 2S3 (Canada); Peroni, Marta [Center for Proton Therapy, Paul Scherrer Institut, 5232 Villigen-PSI (Switzerland)] [Center for Proton Therapy, Paul Scherrer Institut, 5232 Villigen-PSI (Switzerland); Veeraraghavan, Harini [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10065 (United States)] [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10065 (United States); Yang, Jinzhong [Department of Radiation Physics, MD Anderson Cancer Center, Houston, Texas 77030 (United States)] [Department of Radiation Physics, MD Anderson Cancer Center, Houston, Texas 77030 (United States)

    2014-05-15T23:59:59.000Z

    Due to rapid advances in radiation therapy (RT), especially image guidance and treatment adaptation, a fast and accurate segmentation of medical images is a very important part of the treatment. Manual delineation of target volumes and organs at risk is still the standard routine for most clinics, even though it is time consuming and prone to intra- and interobserver variations. Automated segmentation methods seek to reduce delineation workload and unify the organ boundary definition. In this paper, the authors review the current autosegmentation methods particularly relevant for applications in RT. The authors outline the methods’ strengths and limitations and propose strategies that could lead to wider acceptance of autosegmentation in routine clinical practice. The authors conclude that currently, autosegmentation technology in RT planning is an efficient tool for the clinicians to provide them with a good starting point for review and adjustment. Modern hardware platforms including GPUs allow most of the autosegmentation tasks to be done in a range of a few minutes. In the nearest future, improvements in CT-based autosegmentation tools will be achieved through standardization of imaging and contouring protocols. In the longer term, the authors expect a wider use of multimodality approaches and better understanding of correlation of imaging with biology and pathology.

  2. Seismic fragility formulations for segmented buried pipeline systems including the impact of differential ground subsidence

    SciTech Connect (OSTI)

    Pineda Porras, Omar Andrey [Los Alamos National Laboratory; Ordaz, Mario [UNAM, MEXICO CITY

    2009-01-01T23:59:59.000Z

    Though Differential Ground Subsidence (DGS) impacts the seismic response of segmented buried pipelines augmenting their vulnerability, fragility formulations to estimate repair rates under such condition are not available in the literature. Physical models to estimate pipeline seismic damage considering other cases of permanent ground subsidence (e.g. faulting, tectonic uplift, liquefaction, and landslides) have been extensively reported, not being the case of DGS. The refinement of the study of two important phenomena in Mexico City - the 1985 Michoacan earthquake scenario and the sinking of the city due to ground subsidence - has contributed to the analysis of the interrelation of pipeline damage, ground motion intensity, and DGS; from the analysis of the 48-inch pipeline network of the Mexico City's Water System, fragility formulations for segmented buried pipeline systems for two DGS levels are proposed. The novel parameter PGV{sup 2}/PGA, being PGV peak ground velocity and PGA peak ground acceleration, has been used as seismic parameter in these formulations, since it has shown better correlation to pipeline damage than PGV alone according to previous studies. By comparing the proposed fragilities, it is concluded that a change in the DGS level (from Low-Medium to High) could increase the pipeline repair rates (number of repairs per kilometer) by factors ranging from 1.3 to 2.0; being the higher the seismic intensity the lower the factor.

  3. CIS 262 Fall 2013: Solutions to Homework 9 Consider Double-Sat: { | is a Boolean formula with at least two distinct satisfying assignments}.

    E-Print Network [OSTI]

    Plotkin, Joshua B.

    formula with at least two distinct satisfying assignments}. Prove that Double-Sat is NP-complete. We first. This is easy, we just need to provide 2 satisfying assignments for the formula. The requirement that they are two distinct assignments that satisfy the formula, can be verified in polynomial time. Now we give

  4. New possible resonance for population II Cepheids

    SciTech Connect (OSTI)

    Cox, A.N.; Kidman, R.B.

    1984-01-01T23:59:59.000Z

    Light and velocity curves of some radial mode variable stars seem to indicate a resonance where the second overtone has a period exactly half that of the fundamental mode. The two classes of stars that show this resonance by bumps in their light curves are the classical Cepheids and the population II BL Her variables. We here propose that there is another resonance for the population II W Vir variables where the ratio of the first overtone to the fundamental periods is 0.5.

  5. A Decade of Population Change in Texas.

    E-Print Network [OSTI]

    Skrabanek, R. L.

    1963-01-01T23:59:59.000Z

    of community facilities. The political representation of rural dwellers is also likely to be reduced. 3. In 1960, for the first time in history, Texas had more females than males. The projected sex ratio is 96.7 males per 100 females in 1970. At the same... of the Panhandle and extending southward beyond Abilene. This area sustained a decline of one-third in rural population during the decade. Only 2 of the 29 counties (Cottle and Donley) in area 6 had an increase in rural population. Another section, state...

  6. population model Harald Rybka, Jason Wong, Jorge Rivas

    E-Print Network [OSTI]

    Yorke, James

    : food production = food consumption for a population of 8 billion consumption per capita is a constant

  7. 4.1 Bull Trout (Salvelinus confluentus) 4.1.1 Background

    E-Print Network [OSTI]

    , on a scale of 1 to 18, indicating that (1) taxonomically, these populations are distinct population segments Panhandle National Forests have named bull trout as Management Indicator Species (MIS) in their Forest Plan/or competition with other fish species, and risk of over-exploitation. 4 FOCAL AND TARGET SPECIES For more

  8. 11lB ~?\\\\ .\\ 6 Pl1 \\2: '37 1:1 S Er..ECUi\\\\lE SECREiARItli

    E-Print Network [OSTI]

    the North Pacific Humpback Whale Population as a Distinct Population Segment (DPS) and Delist the DPS of 1973, as amended (ESA), pursuant to the 1996 DPS policy (61 FR 4722; February 7, 1996), and delist a finding on whether a petition to list, delist, or reclassify a species presents substantial scientific

  9. The X-ray afterglow flat segment in short GRB 051221A: Energy injection from a millisecond magnetar?

    E-Print Network [OSTI]

    Yizhong Fan; Dong Xu

    2006-07-12T23:59:59.000Z

    The flat segment lasting $\\sim 10^4$ seconds in the X-ray afterglow of GRB051221A represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. In this work, we show that a millisecond pulsar with dipole magnetic field $\\sim 10^{14}$ Gauss could well account for that energy injection. The good quality X-ray flat segment thus suggests that the central engine of this short burst may be a millisecond magnetar.

  10. Apparatus and methods for impingement cooling of an undercut region adjacent a side wall of a turbine nozzle segment

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY); Itzel, Gary Michael (Simpsonville, SC)

    2001-01-01T23:59:59.000Z

    A gas turbine nozzle segment has outer and inner bands. Each band includes a side wall, a cover and an impingement plate between the cover and nozzle wall defining two cavities on opposite sides of the impingement plate. Cooling steam is supplied to one cavity for flow through apertures of the impingement plate to cool the nozzle wall. The side wall of the band and inturned flange define with the nozzle wall an undercut region. The inturned flange has a plurality of apertures for directing cooling steam to cool the side wall between adjacent nozzle segments.

  11. Competitive niche: Way of population regulation

    E-Print Network [OSTI]

    Meszéna, Géza

    1 / 27 Competitive niche: Way of population regulation G´eza Mesz´ena1, Andr´as Szil´agyi1, Kalle of coexistence Theory Regulating loop Results Examples Spatial segregation Functional & spatial segregation Regulating loop y Results Examples Conclusions 7 / 27 #12;Regulating loop Introduction Theory y Regulating

  12. The Population Status The American Alligator

    E-Print Network [OSTI]

    Georgia, University of

    Carolina by Thomas M. Murphy A Publication of the Savannah River Plant National Environmental Research Park'S SAVANNAH RIVER PLANT NATIONAL ENVIRONMENT RESEARCH PARK Copies may be obtained from Savannah River Ecology Laboratory #12;- The Population Status of the American Alligator on the Savannah River Plant, South Carolina

  13. Neoclassical formulations of optimum population theory

    E-Print Network [OSTI]

    Davis, Glenn Anthony

    1971-01-01T23:59:59.000Z

    discontinues [ 9, 221] . The modern theory of an optimum population has added three refinements to this notion: (1) there are several optima, and one of these optima is the "optimum-optimorum"; (2) the optima and the optimum-optimorum can be represented...

  14. Evolutionary Game Theory and Population Dynamics

    E-Print Network [OSTI]

    Miekisz, Jacek

    , Poland miekisz@mimuw.edu.pl 1 Short overview We begin these lecture notes by a crash course in game maximizing their individual payoffs and particles in lattice-gas models minimizing their interaction energy by the minimum of some global quantity, the total energy or free energy of the system. Population dynamics lacks

  15. Galaxy populations from Deep ISO Surveys

    E-Print Network [OSTI]

    Seb Oliver

    2001-06-19T23:59:59.000Z

    I discuss some of the main extra-galactic field surveys which have been undertaken by the Infrared Space Observatory (ISO). I review the findings from the source counts analysies and then examine some of the more recent detailed investigations into the explicit nature of the populations that make up these source counts.

  16. Superposition Principle and the Problem of the Additivity of the Energies and Momenta of Distinct Electromagnetic Fields

    E-Print Network [OSTI]

    Eduardo Notte-Cuello; Waldyr A. Rodrigues Jr

    2006-12-23T23:59:59.000Z

    In this paper we prove in a rigorous mathematical way (using the Clifford bundle formalism) that the energies and momenta of two distinct and arbitrary free Maxwell fields (of finite energies and momenta) that are superposed are additive and thus that there is no incompatibility between the principle of superposition of fields and the principle of energy-momentum conservation, contrary to some recent claims. Our proof depends on a noticeable formula for the energy-momentum 1-form fields T^{a},namely Riesz formula, which is valid for any electromagnetic field configuration F satisfying Maxwell equation.

  17. CHARACTERIZING COMPLEXITY IN SOLAR MAGNETOGRAM DATA USING A WAVELET-BASED SEGMENTATION METHOD

    SciTech Connect (OSTI)

    Kestener, P. [CEA, Centre de Saclay, DSM/IRFU/SEDI, 91191 Gif-sur-Yvette (France); Conlon, P. A.; Fennell, L.; McAteer, R. T. J.; Gallagher, P. T. [School of Physics, Trinity College Dublin, Dublin 2 (Ireland); Khalil, A. [Department of Mathematics and Statistics, University of Maine, Orono, ME 04469 (United States); Arneodo, A., E-mail: pierre.kestener@cea.f [Universite de Lyon, F-69000, Lyon (France)

    2010-07-10T23:59:59.000Z

    The multifractal nature of solar photospheric magnetic structures is studied using the two-dimensional wavelet transform modulus maxima (WTMM) method. This relies on computing partition functions from the wavelet transform skeleton defined by the WTMM method. This skeleton provides an adaptive space-scale partition of the fractal distribution under study, from which one can extract the multifractal singularity spectrum. We describe the implementation of a multiscale image processing segmentation procedure based on the partitioning of the WT skeleton, which allows the disentangling of the information concerning the multifractal properties of active regions from the surrounding quiet-Sun field. The quiet Sun exhibits an average Hoelder exponent {approx}-0.75, with observed multifractal properties due to the supergranular structure. On the other hand, active region multifractal spectra exhibit an average Hoelder exponent {approx}0.38, similar to those found when studying experimental data from turbulent flows.

  18. Segmented scintillation detectors with silicon photomultiplier readout for measuring antiproton annihilations

    SciTech Connect (OSTI)

    Sótér, A., E-mail: anna.soter@mpq.mpg.de [Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching (Germany); Todoroki, K.; Kobayashi, T. [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)] [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Barna, D. [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan) [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Wigner Research Center of Physics, H-1525 Budapest (Hungary); Horváth, D. [Wigner Research Center of Physics, H-1525 Budapest (Hungary)] [Wigner Research Center of Physics, H-1525 Budapest (Hungary); Hori, M. [Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching (Germany) [Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching (Germany); Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

    2014-02-15T23:59:59.000Z

    The Atomic Spectroscopy and Collisions Using Slow Antiprotons experiment at the Antiproton Decelerator (AD) facility of CERN constructed segmented scintillators to detect and track the charged pions which emerge from antiproton annihilations in a future superconducting radiofrequency Paul trap for antiprotons. A system of 541 cast and extruded scintillator bars were arranged in 11 detector modules which provided a spatial resolution of 17 mm. Green wavelength-shifting fibers were embedded in the scintillators, and read out by silicon photomultipliers which had a sensitive area of 1 × 1 mm{sup 2}. The photoelectron yields of various scintillator configurations were measured using a negative pion beam of momentum p ? 1 GeV/c. Various fibers and silicon photomultipliers, fiber end terminations, and couplings between the fibers and scintillators were compared. The detectors were also tested using the antiproton beam of the AD. Nonlinear effects due to the saturation of the silicon photomultiplier were seen at high annihilation rates of the antiprotons.

  19. Scale-Based Gaussian Coverings: Combining Intra and Inter Mixture Models in Image Segmentation

    E-Print Network [OSTI]

    Murtagh, Fionn; Starck, Jean-Luc

    2009-01-01T23:59:59.000Z

    By a "covering" we mean a Gaussian mixture model fit to observed data. Approximations of the Bayes factor can be availed of to judge model fit to the data within a given Gaussian mixture model. Between families of Gaussian mixture models, we propose the R\\'enyi quadratic entropy as an excellent and tractable model comparison framework. We exemplify this using the segmentation of an MRI image volume, based (1) on a direct Gaussian mixture model applied to the marginal distribution function, and (2) Gaussian model fit through k-means applied to the 4D multivalued image volume furnished by the wavelet transform. Visual preference for one model over another is not immediate. The R\\'enyi quadratic entropy allows us to show clearly that one of these modelings is superior to the other.

  20. Pulse shapes from electron and photon induced events in segmented high-purity germanium detectors

    E-Print Network [OSTI]

    I. Abt; A. Caldwell; K. Kröninger; J. Liu; X. Liu; B. Majorovits

    2007-04-23T23:59:59.000Z

    Experiments built to search for neutrinoless double beta-decay are limited in their sensitivity not only by the exposure but also by the amount of background encountered. Radioactive isotopes in the surrounding of the detectors which emit gamma-radiation are expected to be a significant source of background in the GERmanium Detector Array, GERDA. Methods to select electron induced events and discriminate against photon induced events inside a germanium detector are presented in this paper. The methods are based on the analysis of the time structure of the detector response. Data were taken with a segmented GERDA prototype detector. It is shown that the analysis of the time response of the detector can be used to distinguish multiply scattered photons from electrons.

  1. Nondestructive examination of 51 fuel and reflector elements from Fort St. Vrain Core Segment 1

    SciTech Connect (OSTI)

    Miller, C.M.; Saurwein, J.J.

    1980-12-01T23:59:59.000Z

    Fifty-one fuel and reflector elements irradiated in core segment 1 of the Fort St. Vrain High-Temperature Gas-Cooled Reactor (HTGR) were inspected dimensionally and visually in the Hot Service Facility at Fort St. Vrain in July 1979. Time- and volume-averaged graphite temperatures for the examined fuel elements ranged from approx. 400/sup 0/ to 750/sup 0/C. Fast neutron fluences varied from approx. 0.3 x 10/sup 25/ n/m/sup 2/ to 1.0 x 10/sup 25/ n/m/sup 2/ (E > 29 fJ)/sub HTGR/. Nearly all of the examined elements shrank in both axial and radial dimensions. The measured data were compared with strain and bow predictions obtained from SURVEY/STRESS, a computer code that employs viscoelastic beam theory to calculate stresses and deformations in HTGR fuel elements.

  2. Protective effect of taurine on the light-induced disruption of isolated frog rod outer segments

    SciTech Connect (OSTI)

    Pasantes-Morales, H.; Ademe, R.M.; Quesada, O.

    1981-01-01T23:59:59.000Z

    Isolated frog rod outer segments (ROS) incubated in a Krebs-bicarbonate medium, and illuminated for 2 h, show a profound alteration in their structure. This is characterized by distention of discs, vesiculation, and a marked swelling. The light-induced ROS disruption requires the presence of bicarbonate and sodium chloride. Replacement of bicarbonate by TRIS or HEPES protects ROS structure. Also, substitution of sodium chloride by sucrose or choline chloride maintains unaltered the ROS structure. Deletion of calcium, magnesium, or phosphate does not modify the effect produced by illumination. An increased accumulation of labeled bicarbonate and tritiated water is observed in illuminated ROS, as compared with controls in the dark. The presence of taurine, GABA, or glycine, at concentrations of 5-25 mM, effectively counteracts the light-induced ROS disruption. Taurine (25 mM) reduces labeled bicarbonate and tritiated water levels to those observed in the dark incubated ROS.

  3. Method of controlling the side wall thickness of a turbine nozzle segment for improved cooling

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01T23:59:59.000Z

    A gas turbine nozzle segment has outer and inner bands and a vane extending therebetween. Each band has a side wall, a cover and an impingement plate between the cover and nozzle wall defining two cavities on opposite sides of the impingement plate. Cooling steam is supplied to one cavity for flow through apertures of the impingement plate to cool the nozzle wall. The side wall of the band has an inturned flange defining with the nozzle wall an undercut region. The outer surface of the side wall is provided with a step prior to welding the cover to the side wall. A thermal barrier coating is applied in the step and, after the cover is welded to the side wall, the side wall is finally machined to a controlled thickness removing all, some or none of the coating.

  4. Apparatus for impingement cooling a side wall adjacent an undercut region of a turbine nozzle segment

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01T23:59:59.000Z

    A gas turbine nozzle segment has outer and inner bands and vanes therebetween. Each band includes a side wall, a cover and an impingement plate between the cover and nozzle wall defining two cavities on opposite sides of the impingement plate. Cooling steam is supplied to one cavity for flow through apertures of the impingement plate to cool the nozzle wall. The side wall of the band and inturned flange define with the nozzle wall an undercut region. Slots are formed through the inturned flange along the nozzle side wall. A plate having through-apertures extending between opposite edges thereof is disposed in each slot, the slots and plates being angled such that the cooling medium exiting the apertures in the second cavity lie close to the side wall for focusing and targeting cooling medium onto the side wall.

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

    E-Print Network [OSTI]

    Li, Jia

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

  6. CALTECH CORE-COLLAPSE PROJECT (CCCP) OBSERVATIONS OF TYPE II SUPERNOVAE: EVIDENCE FOR THREE DISTINCT PHOTOMETRIC SUBTYPES

    SciTech Connect (OSTI)

    Arcavi, Iair; Gal-Yam, Avishay; Yaron, Ofer [Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100 (Israel); Cenko, S. Bradley; Becker, Adam B. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Fox, Derek B. [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Leonard, Douglas C. [Department of Astronomy, San Diego State University, San Diego, CA 92182 (United States); Moon, Dae-Sik [Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada); Sand, David J. [Las Cumbres Observatory Global Telescope Network, Santa Barbara, CA 93117 (United States); Soderberg, Alicia M. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Kiewe, Michael [Department of Physics, University of Wisconsin, Madison, WI 53706 (United States); Scheps, Raphael [King's College, University of Cambridge, Cambridge CB2 1ST (United Kingdom); Birenbaum, Gali [12 Amos St, Ramat Chen, Ramat Gan 52233 (Israel); Chamudot, Daniel [20 Chen St, Petach Tikvah 49520 (Israel); Zhou, Jonathan, E-mail: iair.arcavi@weizmann.ac.il [101 Dunster Street, Box 398, Cambridge, MA 02138 (United States)

    2012-09-10T23:59:59.000Z

    We present R-band light curves of Type II supernovae (SNe) from the Caltech Core-Collapse Project (CCCP). With the exception of interacting (Type IIn) SNe and rare events with long rise times, we find that most light curve shapes belong to one of three apparently distinct classes: plateau, slowly declining, and rapidly declining events. The last class is composed solely of Type IIb SNe which present similar light curve shapes to those of SNe Ib, suggesting, perhaps, similar progenitor channels. We do not find any intermediate light curves, implying that these subclasses are unlikely to reflect variance of continuous parameters, but rather might result from physically distinct progenitor systems, strengthening the suggestion of a binary origin for at least some stripped SNe. We find a large plateau luminosity range for SNe IIP, while the plateau lengths seem rather uniform at approximately 100 days. As analysis of additional CCCP data goes on and larger samples are collected, demographic studies of core-collapse SNe will likely continue to provide new constraints on progenitor scenarios.

  7. Single Particle Tracking reveals two distinct environments for CD4 receptors at the surface of living T lymphocytes

    SciTech Connect (OSTI)

    Mascalchi, Patrice; Lamort, Anne Sophie; Salome, Laurence [CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, BP 64182, F-31077 Toulouse (France) [CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, BP 64182, F-31077 Toulouse (France); Universite de Toulouse, UPS, IPBS (Institut de Pharmacologie et de Biologie Structurale), F-31077 Toulouse (France); Dumas, Fabrice, E-mail: fabrice.dumas@ipbs.fr [CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, BP 64182, F-31077 Toulouse (France) [CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, BP 64182, F-31077 Toulouse (France); Universite de Toulouse, UPS, IPBS (Institut de Pharmacologie et de Biologie Structurale), F-31077 Toulouse (France)

    2012-01-06T23:59:59.000Z

    Highlights: Black-Right-Pointing-Pointer We studied the diffusion of single CD4 receptors on living lymphocytes. Black-Right-Pointing-Pointer This study reveals that CD4 receptors have either a random or confined diffusion. Black-Right-Pointing-Pointer The dynamics of unconfined CD4 receptors was accelerated by a temperature raise. Black-Right-Pointing-Pointer The dynamics of confined CD4 receptors was unchanged by a temperature raise. Black-Right-Pointing-Pointer Our results suggest the existence of two different environments for CD4 receptors. -- Abstract: We investigated the lateral diffusion of the HIV receptor CD4 at the surface of T lymphocytes at 20 Degree-Sign C and 37 Degree-Sign C by Single Particle Tracking using Quantum Dots. We found that the receptors presented two major distinct behaviors that were not equally affected by temperature changes. About half of the receptors showed a random diffusion with a diffusion coefficient increasing upon raising the temperature. The other half of the receptors was permanently or transiently confined with unchanged dynamics on raising the temperature. These observations suggest that two distinct subpopulations of CD4 receptors with different environments are present at the surface of living T lymphocytes.

  8. Comparing Smooth Arm Movements with the Two-Thirds Power Law and the Related Segmented-Control Hypothesis

    E-Print Network [OSTI]

    Richardson, Magnus

    Comparing Smooth Arm Movements with the Two-Thirds Power Law and the Related Segmented-Control doubt on such an interpretation of the experi- mental data. Key words: motor control; two-thirds power and the two-thirds power law between curvature and velocity. Predictions of these control hy- potheses

  9. Multi-object Segmentation with Coupled Deformable Models Dagmar Kainmuellera, Hans Lameckera, Stefan Zachowa, Markus Hellerb, Hans-Christian Hegea

    E-Print Network [OSTI]

    Andrzejak, Artur

    is guaranteed not to occur. We show correspondence relations for regions on a femoral head and acetabulum accurate results. To improve segmentation accuracy in these cases, knowledge about adjacent structures must is often not sufficient for separating adjacent individual bones from each other. Due to large slice

  10. KAINMUELLER, LAMECKER, ZACHOW: MULTI-OBJECT SEGMENTATION 1 Annals of the BMVA Vol. 2009, No. 5, pp 110 (2009)

    E-Print Network [OSTI]

    2009-01-01T23:59:59.000Z

    of the surfaces is guaranteed not to occur. We show correspondence relations for regions on a femoral head segmentation accuracy in these cases, knowledge about adjacent structures must be exploited. Optimal graph, thresholding is often not sufficient for separating adjacent indi- vidual bones from each other. Due to large

  11. PWP3D: Real-time Segmentation and Tracking of 3D Objects Victor A. Prisacariu Ian D. Reid

    E-Print Network [OSTI]

    Oxford, University of

    the discrimination between statistical foreground and background appearance models, via direct optimisation of the 3D segmentation and 2D to 3D pose tracking, using a known 3D model. Given such a model, we aim to maximise embedding function, and we define an energy over this region and its immediate background surroundings based

  12. 3D BLOB BASED BRAIN TUMOR DETECTION AND SEGMENTATION IN MR IMAGES Chen-Ping Yu1

    E-Print Network [OSTI]

    3D BLOB BASED BRAIN TUMOR DETECTION AND SEGMENTATION IN MR IMAGES Chen-Ping Yu1 , Guilherme Ruppert to 28,079 mm3 in volume. Us- ing 20 clinical 3D MR scans containing from 1 to 15 tumors per scan: (1) an automated brain tumor detection algorithm for clinical 3D MR images; (2) a novel unsupervised

  13. Effects of Palmitoylation on Dynamics and Phospholipid-Bilayer-Perturbing Properties of the N-Terminal Segment of Pulmonary

    E-Print Network [OSTI]

    Pompeu Fabra, Universitat

    Effects of Palmitoylation on Dynamics and Phospholipid-Bilayer- Perturbing Properties of the N-Terminal's, Newfoundland, Canada ABSTRACT It has been proposed that palmitoylation of the N-terminal segment of surfactant membrane models containing palmitoylated and nonpalmitoylated synthetic peptides, based on the N-terminal

  14. Coordination of stem and leaf hydraulic conductance in southern California shrubs: a test of the hydraulic segmentation

    E-Print Network [OSTI]

    Sack, Lawren

    Coordination of stem and leaf hydraulic conductance in southern California shrubs: a test of the hydraulic segmentation hypothesis Alexandria L. Pivovaroff1 , Lawren Sack2 and Louis S. Santiago1 1 2014 New Phytologist (2014) 203: 842­850 doi: 10.1111/nph.12850 Key words: chaparral, hydraulic

  15. Late quaternary geomorphology and geoarchaeology of a segment of the Central Mimbres River Valley, Grant County, New Mexico

    E-Print Network [OSTI]

    Fitch, Michael Anthony

    1996-01-01T23:59:59.000Z

    Two terraces, a modem floodplain, and alluvial fans were identified along a segment of the central Mimbres River Valley in Grant County, New Mexico. The oldest terrace, T2, is composed of one major depositional unit (1) and is capped by a...

  16. Segmentation and Tracking of Mesoscale Eddies in Numeric Ocean Models Vishal Sood, Bin John, Ramprasad Balasubramanian and Amit Tandon*

    E-Print Network [OSTI]

    Tandon, Amit

    Segmentation and Tracking of Mesoscale Eddies in Numeric Ocean Models Vishal Sood, Bin John suggested that the mesoscale eddies and mesoscale features play a strong role in carrying heat poleward oceanographers an invaluable tool to assess mesoscale eddies and the Lagrangian characteristics of this mesoscale

  17. Using electrical, magnetic and acoustic sensors to detect damage in segmental concrete pipes subjected to permanent ground displacement

    E-Print Network [OSTI]

    Lynch, Jerome P.

    Using electrical, magnetic and acoustic sensors to detect damage in segmental concrete pipes and Environmental Engineering, 2340 G.G. Brown Bldg., Ann Arbor, MI 48109, United States c Civil and Environmental Engineering, University of Rhode Island, Department of Civil and Environmental Engineering, Kingston, RI 02881

  18. Bacterial Population Genetics in a Forensic Context

    SciTech Connect (OSTI)

    Velsko, S P

    2009-11-02T23:59:59.000Z

    This report addresses the recent Department of Homeland Security (DHS) call for a Phase I study to (1) assess gaps in the forensically relevant knowledge about the population genetics of eight bacterial agents of concern, (2) formulate a technical roadmap to address those gaps, and (3) identify new bioinformatics tools that would be necessary to analyze and interpret population genetic data in a forensic context. The eight organisms that were studied are B. anthracis, Y. pestis, F. tularensis, Brucella spp., E. coli O157/H7, Burkholderia mallei, Burkholderia pseudomallei, and C. botulinum. Our study focused on the use of bacterial population genetics by forensic investigators to test hypotheses about the possible provenance of an agent that was used in a crime or act of terrorism. Just as human population genetics underpins the calculations of match probabilities for human DNA evidence, bacterial population genetics determines the level of support that microbial DNA evidence provides for or against certain well-defined hypotheses about the origins of an infecting strain. Our key findings are: (1) Bacterial population genetics is critical for answering certain types of questions in a probabilistic manner, akin (but not identical) to 'match probabilities' in DNA forensics. (2) A basic theoretical framework for calculating likelihood ratios or posterior probabilities for forensic hypotheses based on microbial genetic comparisons has been formulated. This 'inference-on-networks' framework has deep but simple connections to the population genetics of mtDNA and Y-STRs in human DNA forensics. (3) The 'phylogeographic' approach to identifying microbial sources is not an adequate basis for understanding bacterial population genetics in a forensic context, and has limited utility, even for generating 'leads' with respect to strain origin. (4) A collection of genotyped isolates obtained opportunistically from international locations augmented by phylogenetic representations of relatedness will not and enzootic outbreaks noted through international outbreak surveillance systems, and 'representative' genetic sequences from each outbreak. (5) Interpretation of genetic comparisons between an attack strain and reference strains requires a model for the network structure of maintenance foci, enzootic outbreaks, and human outbreaks of that disease, coupled with estimates of mutational rate constants. Validation of the model requires a set of sequences from exemplary outbreaks and laboratory data on mutation rates during animal passage. The necessary number of isolates in each validation set is determined by disease transmission network theory, and is based on the 'network diameter' of the outbreak. (6) The 8 bacteria in this study can be classified into 4 categories based on the complexity of the transmission network structure of their natural maintenance foci and their outbreaks, both enzootic and zoonotic. (7) For B. anthracis, Y. pestis, E. coli O157, and Brucella melitensis, and their primary natural animal hosts, most of the fundamental parameters needed for modeling genetic change within natural host or human transmission networks have been determined or can be estimated from existing field and laboratory studies. (8) For Burkholderia mallei, plausible approaches to transmission network models exist, but much of the fundamental parameterization does not. In addition, a validated high-resolution typing system for characterizing genetic change within outbreaks or foci has not yet been demonstrated, although a candidate system exists. (9) For Francisella tularensis, the increased complexity of the transmission network and unresolved questions about maintenance and transmission suggest that it will be more complex and difficult to develop useful models based on currently available data. (10) For Burkholderia pseudomallei and Clostridium botulinum, the transmission and maintenance networks involve complex soil communities and metapopulations about which very little is known. It is not clear that these pathogens can be brought into the in

  19. Emergent vortices in populations of colloidal rollers

    E-Print Network [OSTI]

    Antoine Bricard; Jean-Baptiste-Caussin; Debasish Das; Charles Savoie; Vijayakumar Chikkadi; Kyohei Shitara; Oleksandr Chepizhko; Fernando Peruani; David Saintillan; Denis Bartolo

    2015-06-26T23:59:59.000Z

    Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. Here we report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behavior. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very constituents responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.

  20. The M31 population of supersoft sources

    E-Print Network [OSTI]

    Peter Kahabka

    1999-01-12T23:59:59.000Z

    The 1991 ROSAT PSPC M31 X-ray point source catalog has been screened in order to set up a sample of candidate supersoft sources in this galaxy, additional to the 16 supersoft sources of Supper et al. (1997). 26 candidates have been found. Absorbing hydrogen column densities, effective temperatures and white dwarf masses (assuming the sources are on the stability line of surface nuclear burning) are derived. An observed white dwarf mass distribution is derived which indicates that the masses are constrained to values above 0.90 solar masses. The entire population of supersoft sources in M31 is estimated taking a theoretical white dwarf mass distribution into account, assuming that the observationally derived sample is restricted to white dwarf masses above 0.90 solar, and taking into account that the gas and the source population have a different scale height. A total number of at least 200-500 and at most 6,000-15,000 sources is deduced depending on the used galaxy N_H model, making use of the population synthesis calculation of Yungelson (1996). The spatial distribution favors a disk (or spiral-arm) dominated young stellar population with a ratio of 1/(4-7) of bulge/disk systems. Assuming that all supersoft sources with masses in excess of 0.5 solar masses are progenitors of supernovae of type Ia, a SN Ia rate of (0.8-7) 10^-3 yr^-1 is derived for M31 based on these progenitors. Supersoft sources might account for 20-100% of the total SN Ia rate in a galaxy like M31.

  1. Design exploration: engaging a larger user population

    E-Print Network [OSTI]

    Moore, John Michael

    2009-06-02T23:59:59.000Z

    an interface on a physical shared table space. Whereas PICTIVE requires physical co-location, TelePICTIVE [Miller et al. 1992] and PICTIOL [Farrell et al. 2006] moves the shared space to a collaborative computer application. While GUI developers are still... of DOCTOR OF PHILOSOPHY August 2007 Major Subject: Computer Science DESIGN EXPLORATION: ENGAGING A LARGER USER POPULATION A Dissertation by JOHN MICHAEL MOORE Submitted to the Office of Graduate Studies of Texas A&M University...

  2. WANDERING STARS: AN ORIGIN OF ESCAPED POPULATIONS

    SciTech Connect (OSTI)

    Teyssier, Maureen; Johnston, Kathryn V. [Department of Astronomy, Columbia University, Pupin Physics Laboratory, 550 West 120th Street, New York, NY 10027 (United States); Shara, Michael M. [American Museum of Natural History, 79th Street and Central Park West, New York, NY 10024-5192 (United States)

    2009-12-10T23:59:59.000Z

    We demonstrate that stars beyond the virial radii of galaxies may be generated by the gravitational impulse received by a satellite as it passes through the pericenter of its orbit around its parent. These stars may become energetically unbound (escaped stars), or may travel to further than a few virial radii for longer than a few Gyr, but still remain energetically bound to the system (wandering stars). Larger satellites (10%-100% the mass of the parent), and satellites on more radial orbits are responsible for the majority of this ejected population. Wandering stars could be observable on Mpc scales via classical novae, and on 100 Mpc scales via Type Ia supernova. The existence of such stars would imply a corresponding population of barely bound, old, high-velocity stars orbiting the Milky Way, generated by the same physical mechanism during the Galaxy's formation epoch. Sizes and properties of these combined populations should place some constraints on the orbits and masses of the progenitor objects from which they came, providing insight into the merging histories of galaxies in general and the Milky Way in particular.

  3. Linking Dynamical and Population Genetic Models of Persistent Viral Infection

    E-Print Network [OSTI]

    Kelly, John K.; Williamson, Scott; Orive, Maria E.; Smith, Marilyn S.; Holt, Robert D.

    2003-07-01T23:59:59.000Z

    This article develops a theoretical framework to link dynamical and population genetic models of persistent viral infection. This linkage is useful because, while the dynamical and population genetic theories have developed ...

  4. Diversity waves in collapse-driven population dynamics

    E-Print Network [OSTI]

    Maslov, Sergei

    2015-01-01T23:59:59.000Z

    Populations of species in ecosystems are constrained by the availability of resources within their environment. In effect this means that a growth of one population, needs to be balanced by the reduction in size of others. In neutral models of biodiversity all populations are assumed to change incrementally due to stochastic births and deaths of individuals. Here we propose and model another redistribution mechanism driven by abrupt collapses of the entire population of a single species freeing up resources for the remaining ones. This mechanism may be relevant for communities of bacteria, with strain-specific collapses caused e.g. by invading bacteriophages, or for other ecosystems where infectious diseases play an important role. The emergent property of the population dynamics in our system are cyclic "diversity waves" triggered by collapses of globally dominating populations. The population diversity in the environment peaks at the beginning of each wave and exponentially decreases afterwards. Population ...

  5. autotrophic microbial populations: Topics by E-print Network

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

    18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 MICROBIAL POPULATIONS FECAL PELLETS AND Geosciences Websites Summary: MICROBIAL POPULATIONS FECAL PELLETS AND AND...

  6. access microbial populations: Topics by E-print Network

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

    18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 MICROBIAL POPULATIONS FECAL PELLETS AND Geosciences Websites Summary: MICROBIAL POPULATIONS FECAL PELLETS AND AND...

  7. Evolutionary dynamics in set structured populations Corina E. Tarnitaa

    E-Print Network [OSTI]

    Nowak, Martin A.

    Evolutionary dynamics in set structured populations Corina E. Tarnitaa , Tibor Antala , Hisashi a powerful method to study dynamical population structure: evolutionary set theory. The individuals of popu- lation structure on evolutionary and ecological dynamics. These approaches include spatial models

  8. assessing population genetic: Topics by E-print Network

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

    to random sampling effects Durrett, Richard 5 Population genetics Opinion piece Environmental Management and Restoration Websites Summary: ; optimization 1. INTRODUCTION...

  9. CHEMICAL ENRICHMENT OF DAMPED Ly{alpha} SYSTEMS AS A DIRECT CONSTRAINT ON POPULATION III STAR FORMATION

    SciTech Connect (OSTI)

    Kulkarni, Girish; Hennawi, Joseph F. [Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany); Rollinde, Emmanuel; Vangioni, Elisabeth, E-mail: girish@mpia-hd.mpg.de [Institut d'Astrophysique de Paris, UMR 7095, UPMC, Paris VI, 98 bis boulevard Arago, F-75014 Paris (France)

    2013-08-01T23:59:59.000Z

    Observations of damped Ly{alpha} absorbers (DLAs) can be used to measure gas-phase metallicities at large cosmological look-back times with high precision. Furthermore, relative abundances can still be measured accurately deep into the reionization epoch (z > 6) using transitions redward of Ly{alpha}, even though Gunn-Peterson absorption precludes measurement of neutral hydrogen. In this paper, we study the chemical evolution of DLAs using a model for the coupled evolution of galaxies and the intergalactic medium (IGM), which is constrained by a variety of observations. Our goal is to explore the influence of Population III stars on the abundance patterns of DLAs to determine the degree to which abundance measurements can discriminate between different Population III stellar initial mass functions (IMFs). We include effects, such as inflows onto galaxies due to cosmological accretion and outflows from galaxies due to supernova feedback. A distinct feature of our model is that it self-consistently calculates the effect of Population III star formation on the reionization of an inhomogeneous IGM, thus allowing us to calculate the thermal evolution of the IGM and implement photoionization feedback on low-mass galaxy formation. We find that if the critical metallicity of Population III to II/I transition is {approx}< 10{sup -4} Z{sub Sun }, then the cosmic Population III star formation rate drops to zero for z < 8. Nevertheless, at high redshift (z {approx} 6), chemical signatures of Population III stars remain in low-mass galaxies (halo mass {approx}< 10{sup 9} M{sub Sun }). This is because photoionization feedback suppresses star formation in these galaxies until relatively low redshift (z {approx} 10), and the chemical record of their initial generation of Population III stars is retained. We model DLAs as these low-mass galaxies, and assign to them a mass-dependent H I absorption cross-section in order to predict the expected distribution of DLA abundance ratios. We find that these distributions are anchored toward abundance ratios set by Population II supernova yields, but they exhibit a tail which depends significantly on the Population III IMF for z > 5. Thus, a sample of DLA metallicity and relative abundance measurements at high redshift holds the promise to constrain Population III enrichment and the Population III IMF. We find that a sample of just 10 DLAs with relative abundances measured to an accuracy of 0.1 dex is sufficient to constrain the Population III IMF at 4{sigma}. These constraints may prove stronger than other probes of Population III enrichment, such as metal-poor stars and individual metal-poor DLAs. Our results provide a global picture of the thermal, ionization, and chemical evolution of the universe, and have the potential to rule out certain Population III scenarios.

  10. Dedicated breast CT: Fibroglandular volume measurements in a diagnostic population

    SciTech Connect (OSTI)

    Vedantham, Srinivasan; Shi Linxi; Karellas, Andrew; O'Connell, Avice M. [Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts 01655 (United States); Department of Imaging Sciences, University of Rochester Medical Center, Rochester, New York 14642 (United States)

    2012-12-15T23:59:59.000Z

    Purpose: To determine the mean and range of volumetric glandular fraction (VGF) of the breast in a diagnostic population using a high-resolution flat-panel cone-beam dedicated breast CT system. This information is important for Monte Carlo-based estimation of normalized glandular dose coefficients and for investigating the dependence of VGF on breast dimensions, race, and pathology. Methods: Image data from a clinical trial investigating the role of dedicated breast CT that enrolled 150 women were retrospectively analyzed to determine the VGF. The study was conducted in adherence to a protocol approved by the institutional human subjects review boards and written informed consent was obtained from all study participants. All participants in the study were assigned BI-RADS{sup Registered-Sign} 4 or 5 as per the American College of Radiology assessment categories after standard diagnostic work-up and underwent dedicated breast CT exam prior to biopsy. A Gaussian-kernel based fuzzy c-means algorithm was used to partition the breast CT images into adipose and fibroglandular tissue after segmenting the skin. Upon determination of the accuracy of the algorithm with a phantom, it was applied to 137 breast CT volumes from 136 women. VGF was determined for each breast and the mean and range were determined. Pathology results with classification as benign, malignant, and hyperplasia were available for 132 women, and were used to investigate if the distributions of VGF varied with pathology. Results: The algorithm was accurate to within {+-}1.9% in determining the volume of an irregular shaped phantom. The study mean ({+-} inter-breast SD) for the VGF was 0.172 {+-} 0.142 (range: 0.012-0.719). VGF was found to be negatively correlated with age, breast dimensions (chest-wall to nipple length, pectoralis to nipple length, and effective diameter at chest-wall), and total breast volume, and positively correlated with fibroglandular volume. Based on pathology, pairwise statistical analysis (Mann-Whitney test) indicated that at the 0.05 significance level, there was no significant difference in distributions of VGF without adjustment for age between malignant and nonmalignant breasts (p= 0.41). Pairwise comparisons of the distributions of VGF in increasing order of mammographic breast density indicated all comparisons were statistically significant (p < 0.002). Conclusions: This study used a different clinical prototype breast CT system than that in previous studies to image subjects from a different geographical region, and used a different algorithm for analysis of image data. The mean VGF estimated from this study is within the range reported in previous studies, indicating that the choice of 50% glandular weight fraction to represent an average breast for Monte Carlo-based estimation of normalized glandular dose coefficients in mammography needs revising. In the study, the distributions of VGF did not differ significantly with pathology.

  11. Emergence of Attention within a Neural Population

    E-Print Network [OSTI]

    We present a dynamic model of attention based on the Continuum Neural Field Theory that explains attention as being an emergent property of a neural population. This model is experimentally proved to be very robust and able to track one static or moving target in the presence of very strong noise or in the presence of a lot of distractors, even more salient than the target. This attentional property is not restricted to the visual case and can be considered as a generic attentional process of any spatio-temporal continuous input.

  12. VOL I, ISSUE 1Quarterly Edition Population and Public Policy

    E-Print Network [OSTI]

    Saskatchewan, University of

    VOL I, ISSUE 1Quarterly Edition Population and Public Policy Migration to western Canada increases affect and are affected by public policy decisions. Even the sheer size of the population, the subject of this article, affects public policy because larger populations can usually support a wider range of public

  13. Proximate Population Factors and Deforestation in Tropical Agricultural Frontiers

    E-Print Network [OSTI]

    Lopez-Carr, David

    Proximate Population Factors and Deforestation in Tropical Agricultural Frontiers David L. Carr are significantly associated at the global and regional scales, evidence for population links to deforestation of thought on population­environment theories relevant to deforestation in tropical agricultural frontiers

  14. FACULTY DISTINCTIONS ENDOWED CHAIRS

    E-Print Network [OSTI]

    Chair in Economics Wegman, Edward J. Bernard J. Dunn Professor of Information Technology and Applied

  15. Segmented Polyurethane Nanocomposites: Impact of Controlled Particle Size Nanofillers on the Morphological Response to Uniaxial Deformation

    SciTech Connect (OSTI)

    Finnigan, Bradley; Jack, Kevin; Campbell, Kayleen; Halley, Peter; Truss, Rowan; Casey, Phil; Cookson, David; King, Stephen; Martin, Darren (Rutherford); (ASRP); (Queensland); (CSIRO)

    2008-10-03T23:59:59.000Z

    A series of TPU nanocomposites were prepared by incorporating organically modified layered silicates with controlled particle size. To our knowledge, this is the first study into the effects of layered silicate diameter in polymer nanocomposites utilizing the same mineral for each size fraction. The tensile properties of these materials were found to be highly dependent upon the size of the layered silicates. A decrease in disk diameter was associated with a sharp upturn in the stress-strain curve and a pronounced increase in tensile strength. Results from SAXS/SANS experiments showed that the layered silicates did not affect the bulk TPU microphase structure and the morphological response of the host TPU to deformation or promote/hinder strain-induced soft segment crystallization. The improved tensile properties of the nanocomposites containing the smaller nanofillers resulted from the layered silicates aligning in the direction of strain and interacting with the TPU sequences via secondary bonding. This phenomenon contributes predominantly above 400% strain once the microdomain architecture has largely been disassembled. Large tactoids that are unable to align in the strain direction lead to concentrated tensile stresses between the polymer and filler, instead of desirable shear stresses, resulting in void formation and reduced tensile properties. In severe cases, such as that observed for the composite containing the largest silicate, these voids manifest visually as stress whitening.

  16. Who Will More Likely Buy PHEV: A Detailed Market Segmentation Analysis

    SciTech Connect (OSTI)

    Lin, Zhenhong [ORNL] [ORNL; Greene, David L [ORNL] [ORNL

    2010-01-01T23:59:59.000Z

    Understanding the diverse PHEV purchase behaviors among prospective new car buyers is key for designing efficient and effective policies for promoting new energy vehicle technologies. The ORNL MA3T model developed for the U.S. Department of Energy is described and used to project PHEV purchase probabilities by different consumers. MA3T disaggregates the U.S. household vehicle market into 1458 consumer segments based on region, residential area, driver type, technology attitude, home charging availability and work charging availability and is calibrated to the EIA s Annual Energy Outlook. Simulation results from MA3T are used to identify the more likely PHEV buyers and provide explanations. It is observed that consumers who have home charging, drive more frequently and live in urban area are more likely to buy a PHEV. Early adopters are projected to be more likely PHEV buyers in the early market, but the PHEV purchase probability by the late majority consumer can increase over time when PHEV gradually becomes a familiar product. Copyright Form of EVS25.

  17. 450 mm dual frequency capacitively coupled plasma sources: Conventional, graded, and segmented electrodes

    SciTech Connect (OSTI)

    Yang Yang [Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States); Kushner, Mark J. [Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109-2122 (United States)

    2010-12-01T23:59:59.000Z

    Wafer diameters for microelectronics fabrication will soon transition from 300 to 450 mm at a time when excitation frequencies for capacitively coupled plasmas (CCPs) are increasing to 200 MHz or higher. Already for 300 mm tools, there is evidence that wave behavior (i.e., propagation, constructive, and destructive interference) affects the uniformity of processing. The increase in diameter to 450 mm is likely to exacerbate these effects, perhaps requiring nontraditional tool designs. This is particularly important in dual frequency (DF) CCP tools in which there are potential interactions between frequencies. In this paper, results from a two-dimensional computational investigation of Ar plasma properties in a 450 mm DF-CCP reactor, incorporating a full-wave solution of Maxwell's equations, are discussed. As in 300 mm DF-CCP reactors, the electron density collapses toward the center of the reactor with increasing high frequency (HF), however, with more pronounced finite wavelength effects. Graded conductivity electrodes with multilayer of dielectrics are computationally demonstrated as a possible means to suppress wave effects thereby increasing plasma uniformity. Segmentation of the HF electrode also improves the plasma uniformity by making the electrical distance between the feeds and the sheath edges as uniform as possible.

  18. Impact of Resolution on Simulation of Closed Mesoscale Cellular Convection Identified by Dynamically Guided Watershed Segmentation

    SciTech Connect (OSTI)

    Martini, Matus; Gustafson, William I.; Yang, Qing; Xiao, Heng

    2014-11-27T23:59:59.000Z

    Organized mesoscale cellular convection (MCC) is a common feature of marine stratocumulus that forms in response to a balance between mesoscale dynamics and smaller scale processes such as cloud radiative cooling and microphysics. We use the Weather Research and Forecasting model with chemistry (WRF-Chem) and fully coupled cloud-aerosol interactions to simulate marine low clouds during the VOCALS-REx campaign over the southeast Pacific. A suite of experiments with 3- and 9-km grid spacing indicates resolution-dependent behavior. The simulations with finer grid spacing have smaller liquid water paths and cloud fractions, while cloud tops are higher. The observed diurnal cycle is reasonably well simulated. To isolate organized MCC characteristics we develop a new automated method, which uses a variation of the watershed segmentation technique that combines the detection of cloud boundaries with a test for coincident vertical velocity characteristics. This ensures that the detected cloud fields are dynamically consistent for closed MCC, the most common MCC type over the VOCALS-REx region. We demonstrate that the 3-km simulation is able to reproduce the scaling between horizontal cell size and boundary layer height seen in satellite observations. However, the 9-km simulation is unable to resolve smaller circulations corresponding to shallower boundary layers, instead producing invariant MCC horizontal scale for all simulated boundary layers depths. The results imply that climate models with grid spacing of roughly 3 km or smaller may be needed to properly simulate the MCC structure in the marine stratocumulus regions.

  19. Radiological Findings and Endovascular Management of Three Cases with Segmental Arterial Mediolysis

    SciTech Connect (OSTI)

    Davran, Ramazan, E-mail: ramazandavran@gmail.co [Mustafa Kemal University, Faculty of Medicine, Division of Interventional Radiology, Department of Radiology (Turkey); Cinar, Celal; Parildar, Mustafa; Oran, Ismail [Ege University, Faculty of Medicine, Division of Interventional Radiology, Department of Radiology (Turkey)

    2010-06-15T23:59:59.000Z

    Segmental arterial mediolysis (SAM) is an uncommon self-limited disorder that can cause abdominal catastrophes through massive bleeding or bowel infarction. The former arise from arterial aneurysms, and the latter from arterial stenosis or occlusions. Although this is an acute self-limiting disease, the catastrophic consequence, originating from intra-abdominal hemorrhage (arterial dilatation, aneurysms, dissecting hematomas) or bowel infarction (arterial stenosis, arterial occlusions), is not rare. The identification of these lesions is very important in the differential diagnosis of suspected patients with complaints of abdominal pain with hemorrhage. We report computerized tomography angiography and digital subtraction angiography findings of three cases with abdominal SAM, who were treated with endovascular management due to abdominal bleeding. Angiography showed arterial dilatations, aneurysms, and occlusions of visceral arteries in all three cases, The string-of-beads appearance was present in only one case. Bleeding stopped immediately after embolization of three cases and follow-up revealed no evidence of recurrences at 23, 18, and 15 months, respectively, Arterial coil embolization is an effective treatment modality for bleeding complications of SAM. Close follow-up is recommended, primarily to ascertain the fate of the nontreated arterial lesions.

  20. First Insights into the SWIRE Galaxy Populations

    E-Print Network [OSTI]

    Carol Lonsdale; Maria Polletta; Jason Surace; David Shupe; Fan Fang; C. Kevin Xu; Harding E. Smith; Brian Siana; Michael Rowan-Robinson; Tom Babbedge; Seb Oliver; Francesca Pozzi; Payam Davoodi; Frazer Owen; Deborah Padgett; Dave Frayer; Tom Jarrett; Frank Masci; JoAnne O'Linger; Tim Conrow; Duncan Farrah; Glenn Morrison; Nick Gautier; Alberto Franceschini; Stefano Berta; Ismael Perez-Fournon; Herve Dole; Gordon Stacey; Steve Sergeant; Marguerite Pierre; Matt Griffin; Rick Puetter

    2004-06-08T23:59:59.000Z

    We characterize the SWIRE galaxy populations in the SWIRE validation field within the Lockman Hole, based on the 3.6-24$\\mu$ Spitzer data and deep U,g',r',r' optical imaging within an area ~1/3 sq. deg for ~16,000 Spitzer-SWIRE sources. The entire SWIRE survey will discover over 2.3 million galaxies at 3.6$\\mu$m and almost 350,000 at 24$\\mu$m; ~70,000 of these will be 5-band 3.6-24$\\mu$ detections. The colors cover a broad range, generally well represented by redshifted spectral energy distributions of known galaxy populations, however significant samples of unusually blue objects in the [3.6-4.5]$\\mu$m color are found, as well as many objects very red in the 3.6-24$\\mu$m mid-IR. Nine of these are investigated and are interpreted as star-forming systems, starbursts and AGN from z=0.37 to 2.8, with luminosities from L$_{IR}$=10$^{10.3}$ to 10$^{13.7}$ L$_{\\odot}$

  1. The Formation of Population III Binaries

    E-Print Network [OSTI]

    Kazuya Saigo; Tomoaki Matsumoto; Masayuki Umemura

    2004-10-29T23:59:59.000Z

    We explore the possibility for the formation of Population III binaries. The collapse of a rotating cylinder is simulated with a three-dimensional, high-resolution nested grid, assuming the thermal history of primordial gas. The simulations are done with dimensionless units, and the results are applicable to low-mass as well as massive systems by scaling with the initial density. We find that if the initial angular momentum is as small as $\\beta \\approx 0.1$, where $\\beta$ is the ratio of centrifugal force to pressure force, then the runaway collapse of the cloud stops to form a rotationally-supported disk. After the accretion of the envelope, the disk undergoes a ring instability, eventually fragmenting into a binary. If the initial angular momentum is relatively large, a bar-type instability arises, resulting in the collapse into a single star through rapid angular momentum transfer. The present results show that a significant fraction of Pop III stars are expected to form in binary systems, even if they are quite massive or less massive. The cosmological implications of Population III binaries are briefly discussed.

  2. Collisional population transfer in yterbium ions

    SciTech Connect (OSTI)

    Schauer, Martin Michael [Los Alamos National Laboratory; Torgerson, Justin R [Los Alamos National Laboratory; Danielson, Jeremy R [Los Alamos National Laboratory; Zhao, Xinxin [Los Alamos National Laboratory; Nguyen, Ahn - Tuan [UNIV OF PITTSBURGH; Wang, Li - Bang [NATIONAL TSING HUA UNIV

    2009-01-01T23:59:59.000Z

    Long-lived metastable states of Yb+ ions are used for atomic frequency standards, precision measurements, and quantum information research. The effect of population trapping and transfer in these states must be well understood. We report here the transfer of Yb+ ions into the long-lived {sup 2}F{sub 7/2} state by means of collisions between He buffer gas and Yb+ ions held in a linear Paul trap. Transfer rates were measured as functions of buffer-gas pressure and repump-laser power, and the collisional population transfer rates were extracted. The measured transfer rate coefficients are 8.32(75)x10-11 and 8.65(33)x10-11 cm3/s for the collisional processes {sup 2}P{sub 1/2}{yields}{sup 2}D{sub 5/2} and {sup 2}D{sub 3/2}{yields}{sup 2}F{sub 7/2}, respectively.

  3. Characterization of the first true coaxial 18-fold segmented n-type prototype detector for the GERDA project

    E-Print Network [OSTI]

    I. Abt; A. Caldwell; D. Gutknecht; K. Kröninger; M. Lampert; X. Liu; B. Majorovits; D. Quirion; F. Stelzer; P. Wendling

    2007-01-04T23:59:59.000Z

    The first true coaxial 18-fold segmented n-type HPGe prototype detector produced by Canberra-France for the GERDA neutrinoless double beta-decay project was tested both at Canberra-France and at the Max-Planck-Institut fuer Physik in Munich. The main characteristics of the detector are given and measurements concerning detector properties are described. A novel method to establish contacts between the crystal and a Kapton cable is presented.

  4. Engineering the initial state in broadband population inversion

    E-Print Network [OSTI]

    Bo Y. Chang; Sheokmin Shin; Ignacio R. Sola

    2015-03-03T23:59:59.000Z

    Quantum systems with sublevel structures prevent full population inversion from one manifold of sublevels to the other using strong ultrafast resonant pulses. In this work we explain the mechanism by which this population transfer is blocked. We then develop a novel concept of geometric control, assuming full or partial coherent manipulation within the manifolds and show that by preparing specific coherent superpositions in the initial manifold, full population inversion or full population blockade, {\\it i.e} laser-induced transparency, can be achieved. In particular, by parallel population transfer we show how population inversion between the manifolds can be obtained with minimal pulse area. As the number of sublevels increases, population inversion can overcome the pulse area theorem at the expense of full control over the initial manifold of sublevels.

  5. Population and Climate Change:Population and Climate Change: Are they related?Are they related?

    E-Print Network [OSTI]

    Kalnay, Eugenia

    depletion: water, oil, fisheries, topsoil, etc. · Resource wars and civil conflicts · Malnutrition and world! We are still missing the most important component of the Earth System: the Human System #12;Is, population would be much smaller! · Growth in grain production is now flattening out · Industrial farming

  6. The Birth of a Galaxy: Primoridal Metal Enrichment and Population II Stellar Populations

    E-Print Network [OSTI]

    Wise, John H; Norman, Michael L; Abel, Tom

    2010-01-01T23:59:59.000Z

    Population III stars first form in dark matter halos with masses around 10^6 Msun. By definition, they are metal-free, and their protostellar collapse is driven by molecular hydrogen cooling in the gas-phase, leading to a massive characteristic mass ~100 Msun and suppressed fragmentation. Population II stars with lower characteristic masses form when the star-forming gas reaches a critical metallicity of 10^{-6} - 10^{-3.5} Zsun, depending on whether dust cooling is important. We present adaptive mesh refinement radiation hydrodynamics simulations that follows the transition from Population III to II star formation. We model stellar radiative feedback with adaptive ray tracing. A top-heavy initial mass function for the Population III stars is considered, resulting in a plausible distribution of pair-instability supernovae and associated metal enrichment. We find that the gas fraction recovers from 5 percent to nearly the cosmic fraction in halos with merger histories rich in halos above 10^7 Msun. A single pa...

  7. A segmented multi-loop antenna for selective excitation of azimuthal mode number in a helicon plasma source

    SciTech Connect (OSTI)

    Shinohara, S., E-mail: sshinoha@cc.tuat.ac.jp [Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588 (Japan); Tanikawa, T. [Research Institute of Science and Technology, Tokai University, 4-1-1, Kita-kaname, Hiratsuka, Kanagawa 259-1292 (Japan); Motomura, T. [National Institute of Advanced Industrial Science and Technology (AIST), 807-1, Shuku-machi, Tosu, Saga 841-0052 Japan (Japan)

    2014-09-15T23:59:59.000Z

    A flat type, segmented multi-loop antenna was developed in the Tokai Helicon Device, built for producing high-density helicon plasma, with a diameter of 20 cm and an axial length of 100 cm. This antenna, composed of azimuthally splitting segments located on four different radial positions, i.e., r = 2.8, 4.8, 6.8, and 8.8 cm, can excite the azimuthal mode number m of 0, ±1, and ±2 by a proper choice of antenna feeder parts just on the rear side of the antenna. Power dependencies of the electron density n{sub e} were investigated with a radio frequency (rf) power less than 3 kW (excitation frequency ranged from 8 to 20 MHz) by the use of various types of antenna segments, and n{sub e} up to ?5 × 10{sup 12} cm{sup ?3} was obtained after the density jump from inductively coupled plasma to helicon discharges. Radial density profiles of m = 0 and ±1 modes with low and high rf powers were measured. For the cases of these modes after the density jump, the excited mode structures derived from the magnetic probe measurements were consistent with those expected from theory on helicon waves excited in the plasma.

  8. A Population Model for the Academic Ecosystem

    E-Print Network [OSTI]

    Wu, Yan; Chiu, Dah Ming

    2015-01-01T23:59:59.000Z

    In recent times, the academic ecosystem has seen a tremendous growth in number of authors and publications. While most temporal studies in this area focus on evolution of co-author and citation network structure, this systemic inflation has received very little attention. In this paper, we address this issue by proposing a population model for academia, derived from publication records in the Computer Science domain. We use a generalized branching process as an overarching framework, which enables us to describe the evolution and composition of the research community in a systematic manner. Further, the observed patterns allow us to shed light on researchers' lifecycle encompassing arrival, academic life expectancy, activity, productivity and offspring distribution in the ecosystem. We believe such a study will help develop better bibliometric indices which account for the inflation, and also provide insights into sustainable and efficient resource management for academia.

  9. Soft Color Segmentation and Its Applications Yu-Wing Tai, Student Member, IEEE Computer Society, Jiaya Jia, Member, IEEE Computer Society,

    E-Print Network [OSTI]

    Kim, Dae-Shik

    to that of traditional segmentation approaches. In this paper, we evaluate and compare our automatic method with k-means to converge to a good optimal solution. We perform extensive evaluation and comparison and demonstrate

  10. Prediction Error Associated With The Perceptual Segmentation of Naturalistic Events Jeffrey M. Zacks1,2*, Christopher A. Kurby1,3, Michelle L. Eisenberg1, Nayiri

    E-Print Network [OSTI]

    Zacks, Jeffrey M.

    Prediction Error Associated With The Perceptual Segmentation of Naturalistic;Abstract Predicting the near future is important for survival and plays a central role in theories of perception, language processing and learning. Prediction

  11. Old stellar populations in distant radio galaxies

    E-Print Network [OSTI]

    James Dunlop

    1998-01-13T23:59:59.000Z

    I describe the current status of our attempts to determine the age of the oldest known stellar populations at high redshift, in the red mJy radio galaxies 53W091 ($z = 1.55$) and 53W069 ($z = 1.43$). During the past year the original conclusion of Dunlop et al. (1996) - that 53W091 is $>3$ Gyr old - has been questioned from two, basically orthogonal directions. First, reports that the near-infrared light from 53W091 is highly polarized have cast some doubt on whether its red colour is genuinely due to an old population of stars. Second, assuming that all the light is indeed due to stars, it has been claimed that 53W091 is in fact only 1-2 Gyr old. Here I present a preliminary analysis of new infrared polarimetric observations of 53W091 which show that the first of these criticisms can be rejected with very high confidence. I then explore why different modellers have derived different ages for 53W091, and present new model fits to the spectrum of 53W069 which demonstrate that different spectral synthesis codes are certainly in good agreement that this galaxy is 3-4 Gyr old. Finally I present a preliminary analysis of the morphologies and scale-lengths of 53W091 and 53W069 as derived from new I-band WFPC2 HST images, and compare the results with those for 3CR galaxies at comparable redshifts. I conclude that the scalelengths and luminosities of radio galaxies at $z \\simeq 1.5$ appear to scale together as would be predicted from the Kormendy relation for low-redshift elliptical galaxies.

  12. Structure of N-Terminal Domain of NPC1 Reveals Distinct Subdomains for Binding and Transfer of Cholesterol

    SciTech Connect (OSTI)

    Kwon, Hyock Joo; Abi-Mosleh, Lina; Wang, Michael L.; Deisenhofer, Johann; Goldstein, Joseph L.; Brown, Michael S.; Infante, Rodney E.; (UTSMC)

    2010-09-21T23:59:59.000Z

    LDL delivers cholesterol to lysosomes by receptor-mediated endocytosis. Exit of cholesterol from lysosomes requires two proteins, membrane-bound Niemann-Pick C1 (NPC1) and soluble NPC2. NPC2 binds cholesterol with its isooctyl side chain buried and its 3{beta}-hydroxyl exposed. Here, we describe high-resolution structures of the N-terminal domain (NTD) of NPC1 and complexes with cholesterol and 25-hydroxycholesterol. NPC1(NTD) binds cholesterol in an orientation opposite to NPC2: 3{beta}-hydroxyl buried and isooctyl side chain exposed. Cholesterol transfer from NPC2 to NPC1(NTD) requires reorientation of a helical subdomain in NPC1(NTD), enlarging the opening for cholesterol entry. NPC1 with point mutations in this subdomain (distinct from the binding subdomain) cannot accept cholesterol from NPC2 and cannot restore cholesterol exit from lysosomes in NPC1-deficient cells. We propose a working model wherein after lysosomal hydrolysis of LDL-cholesteryl esters, cholesterol binds NPC2, which transfers it to NPC1(NTD), reversing its orientation and allowing insertion of its isooctyl side chain into the outer lysosomal membranes.

  13. The Nudix Hydrolase CDP-Chase, a CDP-Choline Pyrophosphatase, Is an Asymmetric Dimer with Two Distinct Enzymatic Activities

    SciTech Connect (OSTI)

    Duong-Ly, Krisna C.; Gabelli, Sandra B.; Xu, WenLian; Dunn, Christopher A.; Schoeffield, Andrew J.; Bessman, Maurice J.; Amzel, L. Mario (Loyola); (JHU)

    2011-09-06T23:59:59.000Z

    A Nudix enzyme from Bacillus cereus catalyzes the hydrolysis of CDP-choline to produce CMP and phosphocholine. Here, we show that in addition, the enzyme has a 3{prime} {yields} 5{prime} RNA exonuclease activity. The structure of the free enzyme, determined to a 1.8-{angstrom} resolution, shows that the enzyme is an asymmetric dimer. Each monomer consists of two domains, an N-terminal helical domain and a C-terminal Nudix domain. The N-terminal domain is placed relative to the C-terminal domain such as to result in an overall asymmetric arrangement with two distinct catalytic sites: one with an 'enclosed' Nudix pyrophosphatase site and the other with a more open, less-defined cavity. Residues that may be important for determining the asymmetry are conserved among a group of uncharacterized Nudix enzymes from Gram-positive bacteria. Our data support a model where CDP-choline hydrolysis is catalyzed by the enclosed Nudix site and RNA exonuclease activity is catalyzed by the open site. CDP-Chase is the first identified member of a novel Nudix family in which structural asymmetry has a profound effect on the recognition of substrates.

  14. Dust-acoustic Gardner solitons and double layers in dusty plasmas with nonthermally distributed ions of two distinct temperatures

    SciTech Connect (OSTI)

    Tasnim, I.; Mamun, A. A. [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh)] [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh); Masud, M. M. [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh) [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh); Department of Physics, Bangladesh University of Engineering and Technology (BUET), Dhaka (Bangladesh); Asaduzzaman, M. [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh) [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh); Department of Electronics and Communications Engineering, East West University, Aftabnagar, Dhaka 1212 (Bangladesh)

    2013-03-15T23:59:59.000Z

    A rigorous theoretical investigation has been performed on dust-acoustic (DA) solitary structures in an unmagnetized dusty plasma, consisting of negatively charged mobile dust grains, Boltzmann distributed electrons, and nonthermally distributed ions of two distinct temperatures. The Korteweg-de Vries (K-dV), modified K-dV (mK-dV) and Gardner equations, and their solitary waves (SWs) and double layer (DL) (in case of Gardner equation) solutions are derived by using the reductive perturbation technique. The basic features of the DA Gardner solitons (GSs) and DLs are studied analytically as well as numerically. It has been observed that the GSs significantly differ from K-dV and mK-dV solitons, and only positive potential DLs exist in the system. It is also studied that two-temperature nonthermal ions significantly modify the nature and basic properties of the DA SWs. The present investigation can be very effective for understanding and studying the nonlinear characteristics of the DA waves in laboratory and space dusty plasmas.

  15. Impact of controlled particle size nanofillers on the mechanical properties of segmented polyurethane nanocomposites

    SciTech Connect (OSTI)

    Finnigan, Bradley; Casey, Phil; Cookson, David; Halley, Peter; Jack, Kevin; Truss, Rowan; Martin, Darren (Queensland); (UC)

    2008-04-02T23:59:59.000Z

    The impact of average layered silicate particle size on the mechanical properties of thermoplastic polyurethane (TPU) nanocomposites has been investigated. At fixed addition levels (3 wt% organosilicate), an increase in average particle size resulted in an increase in stiffness. Negligible stiffening was observed for the smallest particles (30 nm) due to reduced long-range intercalation and molecular confinement, as well as ineffective stress transfer from matrix to filler. At low strain ({le}100%), an increase in filler particle size was associated with an increase in the rate of stress relaxation, tensile hysteresis, and permanent set. At high strain (1200%), two coexisting relaxation processes were observed. The rate of the slower (long-term) relaxation process, which is believed to primarily involve the hard segment rich structures, decreased on addition of particles with an average diameter of 200 nm or less. At high strain the tensile hysteresis was less sensitive to particle size, however the addition of particles with an average size of 200 nm or more caused a significant increase in permanent set. This was attributed to slippage of temporary bonds at the polymer-filler interface, and to the formation of voids at the sites of unaligned tactoids. Relative to the host TPU, the addition of particles with an average size of 30 nm caused a reduction in permanent set. This is a significant result because the addition of fillers to elastomers has long been associated with an increase in hysteresis and permanent set. At high strain, well dispersed and aligned layered silicates with relatively small interparticle distances and favourable surface interactions are capable of imparting a resistance to molecular slippage throughout the TPU matrix.

  16. Cardiac imaging using a four-segment slant-hole collimator

    SciTech Connect (OSTI)

    Bal, G.; DiBella, E.V.R.; Gullberg, G.T.; Zeng, G.L.

    2005-09-27T23:59:59.000Z

    The main objective of this paper is to evaluate four segmentslant-hole (FSSH) SPECT for cardiac imaging. FSSH is a slant-holecollimator that is divided into four segments and arranged such that thephotons from the volume of interest (VOI)are projected four times forevery location of the detector. These multiple projections help toimprove the sensitivity of the photons from the VOI by a factor4(cos(sigma))3, where is the slant angle of the collimator. Anotheradvantage of FSSH SPECT is a reduction in the total scan time, since agantry rotation of pi-2sigma is sufficient to satisfy Orlov's condition.That means, for a slant angle of 30 degrees, a gantry rotation of 120degrees is sufficient to satisfy Orlov's condition and obtain a completedataset. In this paper, we evaluate and compare the reconstructed imagesobtained using an FSSH collimator, for a gantry rotation of 180 degreesand 120 degrees, with those obtained from a parallel-hole (PH) SPECTsystem using a 180 degree acquisition. The reconstructed images from thethree imaging geometries were compared in terms of average image noise,contrast, and percentage error, for seven different clinical count levelsand for multiple noise realizations in each case. The increase insensitivity of the FSSH system was found to translate into a proportionaldecrease in statistical noise for voxels in the VOI of the reconstructedimages. Finally, a physical phantom study was performed using a prototypeFSSH collimator. Our findings show that FSSH collimators have thepotential of being the collimator of choice for cardiac SPECT imaging.Though we explore the potential of FSSH collimators for cardiac imagingin this paper, the concept can be extended for imaging other organs suchas the breasts, kidney, and brain.

  17. Identification of photons in double beta-decay experiments using segmented germanium detectors - studies with a GERDA Phase II prototype detector

    E-Print Network [OSTI]

    I. Abt; A. Caldwell; K. Kröninger; J. Liu; X. Liu; B. Majorovits

    2007-01-04T23:59:59.000Z

    The sensitivity of experiments searching for neutrinoless double beta-decay of germanium was so far limited by the background induced by external gamma-radiation. Segmented germanium detectors can be used to identify photons and thus reduce this background component. The GERmanium Detector Array, GERDA, will use highly segmented germanium detectors in its second phase. The identification of photonic events is investigated using a prototype detector. The results are compared with Monte Carlo data.

  18. Stellar Kinematics and Populations of Early-Type Galaxies with the SAURON and OASIS Integral-Field Spectrographs

    E-Print Network [OSTI]

    McDermid, R M; Kuntschner, H; Emsellem, E; Shapiro, K L; Bureau, M; Cappellari, M; Davies, R L; Falcon-Barroso, J; Krajnovic, D; Peletier, R F; Sarzi, M; De Zeeuw, T

    2006-01-01T23:59:59.000Z

    We summarise the results and achievements of integral-field spectroscopy of early-type galaxies, observed as part of a survey using both the SAURON and OASIS spectrographs. From the perspective of integral-field spectroscopy, these otherwise smooth and featureless objects show a wealth of structure, both in their stellar kinematics and populations. We focus on the stellar content, and examine properties on both kiloparsec scales with SAURON, and scales of 100's of parsecs with OASIS. These complementary studies reveal two types of kinematically distinct components (KDCs), differing primarily in their intrinsic sizes. In previous studies, KDCs and their host galaxies have generally been found to be unremarkable in other aspects. We show that large KDCs, typical of the well-studied cases, indeed show little or no age differences with their host galaxy. The KDCs detected with the higher spatial-resolution of OASIS are intrinsically smaller and include, in contrast, a significant fraction of young stars. We specu...

  19. Special population planner, version 4.0.

    SciTech Connect (OSTI)

    Kuiper, J.; Tanzman, E.; Metz, W.

    2007-03-26T23:59:59.000Z

    Emergencies happen every day. Many are caused by storms or auto accidents and can be planned for, if not predicted. Emergencies resulting from natural hazards often affect a large number of people, and planning for them can be difficult, since knowledge of the needs of the people involved is generally unavailable. Emergencies resulting from accidents at industrial and military facilities can also be large scale in nature if people must be evacuated or sheltered in place. Federal planning for large scale emergencies is the responsibility of the Federal Emergency Management Agency (FEMA), which provides assistance to various emergency management agencies at the national, state and local level. More information about FEMA is available at http://www.fema.gov/. The purpose of the Special Population Planner (SPP) is to help emergency planners address the needs of persons with special needs. The exact definition of 'special population' is a policy decision. Policymakers have included a variety of groups in this term, such as persons with disabilities, those who do not have vehicles with which to evacuate, children who are unattended at times (latchkey children), and many others. The SPP was developed initially for the Alabama Emergency Management Agency as part of its Chemical Stockpile Emergency Preparedness Program (CSEPP), which aids emergency planning and preparedness in communities surrounding military installations across the United States where chemical weapons are stored pending their destruction under federal law. Like that specialized application, this open-source version contains a set of specialized Geographic Information System (GIS) tools to facilitate emergency planning on behalf of persons with special needs, regardless of how the term is defined. While the original SPP system was developed for emergency planning relating to chemical hazards, it can be applied to other threats as well. It is apparent from Hurricane Katrina and other natural and man-made disasters that many of the problems posed by emergency planning for a chemical weapons agent release are shared by other hazards as well. The notion that emergency planning shares common functions underlies the decision by FEMA to include the Chemical Stockpile Emergency Preparedness Program (CSEPP) in its 'all-hazards' planning approach. The CSEPP's official planning guidance operationalizes this approach by suggesting that state and local CSEPP emergency plans 'should be appended to the existing all-hazards emergency plan.' The SPP is programmed as a set of tools within an ESRI ArcMap 9.1 project. ArcMap is a component of both ESRI ArcGIS 9.1 and ESRI ArcView 9.1, and it provides a rich GIS user interface for viewing spatial and tabular data, analyzing it, and producing output reports and maps. This GIS interface has been augmented with the SPP tools for a user interface that provides custom functionality for emergency planning. The system as released also includes some hypothetical example records for special needs populations, facilities, resources, control points and sirens sufficient for showing how the system would work with real information. A GIS database is included with some publicly available example layers. The SPP is designed to support emergency planners as they address emergency management issues, and includes capabilities that support the collection and importing of data, the review of data in a spatial context, and GIS tools for emergency planning. The SPP system allows for the identification and categorization of response zones to allow for multiple levels of preparedness. An Immediate Response Zone (IRZ) might be designated as the area 0 to 10 miles from a facility where the response would be the most urgent. SPP can support more than one set of planning zones to accommodate different types of emergencies or the different jurisdictions of emergency response organizations. These areas can be delineated by any number of criteria that make sense for the area. An area like New Orleans might designate response zones based on the depth above/below s

  20. adult swiss population: Topics by E-print Network

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

    Topic Index 1 Multifractal portrayal of the Swiss population CERN Preprints Summary: Fractal geometry is a fundamental approach for describing the complex irregularities of the...

  1. algorithm population sizing: Topics by E-print Network

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

    CiteSeer Summary: Deciding the appropriate population size and number of islands for distributed island-model genetic algorithms is often critical to the algorithms success. This...

  2. arab general population: Topics by E-print Network

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

    de Paris-Sud XI, Universit de 45 RESEARCH ARTICLE Contemporary epidemiology of gout in the UK general population CiteSeer Summary: Introduction: The objective of this...

  3. adult general population: Topics by E-print Network

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

    Texas (P. c. stanleyana Oli, Madan K. 30 RESEARCH ARTICLE Contemporary epidemiology of gout in the UK general population CiteSeer Summary: Introduction: The objective of this...

  4. apis mellifera populations: Topics by E-print Network

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

    The effect of Apis mellifera carnica Polm worker bee source for populating mating of Croatia (Received 9 December 1991; accepted 18 March 1992) Summary The influence of worker...

  5. Population estimates for Phase 1: Hanford Environmental Dose Reconstruction Project

    SciTech Connect (OSTI)

    Beck, D.M.; Erickson, A.R.; Harkreader, S.A.

    1992-03-01T23:59:59.000Z

    This report summarizes the population estimates of Phase I of the Hanford Environmental Dose Reconstruction (HEDR) Project. These estimates were used to develop preliminary dose estimates.

  6. admixed population lived: Topics by E-print Network

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

    population in urban United Nations; Nations Unies 1999-01-01 67 Developing solutions for sustainable living-the Urban Living Laboratory: The world's largest 'living laboratory'...

  7. ORISE: Worker Health Studies - Testing Beryllium Vendor Populations

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

    Oak Ridge Institute for Science Education Beryllium Testing Vendor Populations When former employees at 25 closed U.S. Department of Energy (DOE) beryllium vendor companies needed...

  8. andalusian population sample: Topics by E-print Network

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

    sample allocation and effort in detecting population differentiation Dordrecht 2014 Abstract One of the most pressing issues in spatial genetics concerns sampling....

  9. aegypti population replacement: Topics by E-print Network

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

    Juliano, Steven A. 6 2132014 Household explosion replaces population explosion as world concern -UPI.com http:www.upiasia.comScience-Technology20140211...

  10. asthmatic population sample: Topics by E-print Network

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

    sample allocation and effort in detecting population differentiation Dordrecht 2014 Abstract One of the most pressing issues in spatial genetics concerns sampling....

  11. POPULATION ECOLOGY Phenology of Asian Citrus Psyllid (Hemiptera: Liviidae) and

    E-Print Network [OSTI]

    Hoddle, Mark S.

    POPULATION ECOLOGY Phenology of Asian Citrus Psyllid (Hemiptera: Liviidae) and Associated citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), initiates economic losses in citrus due

  12. Population Games for Cognitive Radios: Evolution through Imitation

    E-Print Network [OSTI]

    Coupechoux, Marceau

    , Marceau Coupechoux1 1INFRES, Telecom ParisTech, 2LRI, Paris XI May 9th, 2011 SI, LC, MC () Population

  13. The Chemical Enrichment History of the Magellanic Clouds Field Populations

    E-Print Network [OSTI]

    R. Carrera; C. Gallart; A. Aparicio; E. Costa; E. Hardy; R. A. Mendez; N. E. D. Noel; R. Zinn

    2008-09-24T23:59:59.000Z

    We report the results of our project devoted to study the chemical enrichment history of the field population in the Magellanic Clouds using Ca II triplet spectroscopy.

  14. Inferring statistics of planet populations by means of automated microlensing searches

    E-Print Network [OSTI]

    M. Dominik; U. G. Jorgensen; K. Horne; Y. Tsapras; R. A. Street; L. Wyrzykowski; F. V. Hessman; M. Hundertmark; S. Rahvar; J. Wambsganss; G. Scarpetta; V. Bozza; S. Calchi Novati; L. Mancini; G. Masi; J. Teuber; T. C. Hinse; I. A. Steele; M. J. Burgdorf; S. Kane

    2008-07-31T23:59:59.000Z

    (abridged) The study of other worlds is key to understanding our own, and not only provides clues to the origin of our civilization, but also looks into its future. Rather than in identifying nearby systems and learning about their individual properties, the main value of the technique of gravitational microlensing is in obtaining the statistics of planetary populations within the Milky Way and beyond. Only the complementarity of different techniques currently employed promises to yield a complete picture of planet formation that has sufficient predictive power to let us understand how habitable worlds like ours evolve, and how abundant such systems are in the Universe. A cooperative three-step strategy of survey, follow-up, and anomaly monitoring of microlensing targets, realized by means of an automated expert system and a network of ground-based telescopes is ready right now to be used to obtain a first census of cool planets with masses reaching even below that of Earth orbiting K and M dwarfs in two distinct stellar populations, namely the Galactic bulge and disk. The hunt for extra-solar planets acts as a principal science driver for time-domain astronomy with robotic-telescope networks adopting fully-automated strategies. Several initiatives, both into facilities as well as into advanced software and strategies, are supposed to see the capabilities of gravitational microlensing programmes step-wise increasing over the next 10 years. New opportunities will show up with high-precision astrometry becoming available and studying the abundance of planets around stars in neighbouring galaxies becoming possible. Finally, we should not miss out on sharing the vision with the general public, and make its realization to profit not only the scientists but all the wider society.

  15. The Formation of Population III Binaries

    E-Print Network [OSTI]

    Saigo, K; Umemura, M; Saigo, Kazuya; Matsumoto, Tomoaki; Umemura, Masayuki

    2004-01-01T23:59:59.000Z

    We explore the possibility for the formation of Population III binaries. The collapse of a rotating cylinder is simulated with a three-dimensional, high-resolution nested grid, assuming the thermal history of primordial gas. The simulations are done with dimensionless units, and the results are applicable to low-mass as well as massive systems by scaling with the initial density. We find that if the initial angular momentum is as small as $\\beta \\approx 0.1$, where $\\beta$ is the ratio of centrifugal force to pressure force, then the runaway collapse of the cloud stops to form a rotationally-supported disk. After the accretion of the envelope, the disk undergoes a ring instability, eventually fragmenting into a binary. If the initial angular momentum is relatively large, a bar-type instability arises, resulting in the collapse into a single star through rapid angular momentum transfer. The present results show that a significant fraction of Pop III stars are expected to form in binary systems, even if they ar...

  16. Carbon stars in populations of different metallicity

    E-Print Network [OSTI]

    M. A. T. Groenewegen

    1998-11-09T23:59:59.000Z

    Our current knowledge of carbon stars in the Local Group and beyond, is discussed. Although many carbon stars and late M-stars have been identified in external galaxies a coherent understanding in terms of the chemical evolution- and star formation rate-history of a galaxy is still largely lacking. Issues that need to be addressed are: 1) for some of the larger galaxies only a small fraction in area has been surveyed so far, 2) surveys have been conducted using different techniques, and may be incomplete in bolometric magnitude, 3) only for some galaxies is there information about the late M-star population, 4) not all galaxies in the Local Group have been surveyed, 5) only for a sub-set of stars are bolometric magnitudes available. From the existing observations one can derive the following: the formation of carbon stars is both a function of metallicity and star-formation. In galaxies with a similar star-formation rate history, there will be relatively more carbon stars formed in the system with the lower metallicity. On the other hand, the scarcity of AGB type carbon stars in some systems with the lowest metallicity indicates that these galaxies have had a low, if any, star-formation rate history over the last few Gyrs.

  17. Magnetic Fields in Population III Star Formation

    SciTech Connect (OSTI)

    Turk, Matthew J.; Oishi, Jeffrey S.; Abel, Tom; Bryan, Greg

    2012-02-22T23:59:59.000Z

    We study the buildup of magnetic fields during the formation of Population III star-forming regions, by conducting cosmological simulations from realistic initial conditions and varying the Jeans resolution. To investigate this in detail, we start simulations from identical initial conditions, mandating 16, 32 and 64 zones per Jeans length, and studied the variation in their magnetic field amplification. We find that, while compression results in some amplification, turbulent velocity fluctuations driven by the collapse can further amplify an initially weak seed field via dynamo action, provided there is sufficient numerical resolution to capture vortical motions (we find this requirement to be 64 zones per Jeans length, slightly larger than, but consistent with previous work run with more idealized collapse scenarios). We explore saturation of amplification of the magnetic field, which could potentially become dynamically important in subsequent, fully-resolved calculations. We have also identified a relatively surprising phenomena that is purely hydrodynamic: the higher-resolved simulations possess substantially different characteristics, including higher infall-velocity, increased temperatures inside 1000 AU, and decreased molecular hydrogen content in the innermost region. Furthermore, we find that disk formation is suppressed in higher-resolution calculations, at least at the times that we can follow the calculation. We discuss the effect this may have on the buildup of disks over the accretion history of the first clump to form as well as the potential for gravitational instabilities to develop and induce fragmentation.

  18. WITS MINING : DISTINCTLY EXCEPTIONAL As the largest School of Mining Engineering in the English-speaking world, we continue to invest in

    E-Print Network [OSTI]

    Wagner, Stephan

    WITS MINING : DISTINCTLY EXCEPTIONAL As the largest School of Mining Engineering in the English-speaking world, we continue to invest in the knowledge and development of generations of mining engineers - the gems of our future. Wits School of Mining Engineering Prof Fred Cawood Head of School We have Size

  19. Brazil 1 Buzius and Salvador Brazil is one of those countries that have a very distinctive feel and a vivid image. Each one

    E-Print Network [OSTI]

    Beimel, Amos

    Brazil 1 ­ Buzius and Salvador Brazil is one of those countries that have a very distinctive feel and a vivid image. Each one of us carries a detailed picture of Brazil in his mind, even without being there and carnival. The fantastic thing is that upon arriving to Brazil, one finds out that the real Brazil matches

  20. A program for reducing teacher's resistance to changes in curriculum in centralized education systems. An experience on changes of mathematics text books in Iran based on distinction results.

    E-Print Network [OSTI]

    Spagnolo, Filippo

    systems. An experience on changes of mathematics text books in Iran based on distinction results. Zohreh systems are prepared from an upper-stream reference and hand over teachers' disposal . Curricula in Iran as Polya had said. And so curricula developers in Iran tried to integrate Polya's method in math books