National Library of Energy BETA

Sample records for distinct population segment

  1. Tailored Marketing for Under-represented Population Segments...

    Energy Savers [EERE]

    Tailored Marketing for Under-represented Population Segments (201) Tailored Marketing for Under-represented Population Segments (201) August 13, 2015 3:00PM to 4:3...

  2. Non-LTE analysis of copper abundances for the two distinct halo populations in the solar neighborhood

    E-Print Network [OSTI]

    Yan, H L; Nissen, P E; Zhao, G

    2015-01-01

    Two distinct halo populations were found in the solar neighborhood by a series of works. They can be clearly separated by [alpha\\Fe] and several other elemental abundance ratios including [Cu/Fe]. Very recently, a non-local thermodynamic equilibrium (non-LTE) study revealed that relatively large departures exist between LTE and non-LTE results in copper abundance analysis. We aim to derive the copper abundances for the stars from the sample of Nissen et al (2010) with both LTE and non-LTE calculations. Based on our results, we study the non-LTE effects of copper and investigate whether the high-alpha population can still be distinguished from the low-alpha population in the non-LTE [Cu/Fe] results. Our differential abundance ratios are derived from the high-resolution spectra collected from VLT/UVES and NOT/FIES spectrographs. Applying the MAFAGS opacity sampling atmospheric models and spectrum synthesis method, we derive the non-LTE copper abundances based on the new atomic model with current atomic data obt...

  3. Population segments with disabilities 

    E-Print Network [OSTI]

    Stough, Laura

    2013-01-01

    because only approximately 4% of older Americans live in nursing care (McGuire, et al, 2007). To further illustrate the concept of layered vulnerability, it is well understood that older adults are likely to “age-in-place” such that they are less likely..., both individuals with disabilities and elderly adults often evidence similar specific physical disabilities, such as mobility disabilities or sensory impairments. Both also experience socio-economic vulnerabilities, such as poverty, unemployment...

  4. 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

    2009-01-01

    -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

  5. Learning static object segmentation from motion segmentation

    E-Print Network [OSTI]

    Ross, Michael G. (Michael Gregory), 1975-

    2005-01-01

    This thesis describes the SANE (Segmentation According to Natural Examples) algorithm for learning to segment objects in static images from video data. SANE uses background subtraction to find the segmentation of moving ...

  6. Motion Segmentation of Truncated Signed Distance Function based Volumetric Samunda Perera, Nick Barnes, Xuming He

    E-Print Network [OSTI]

    Kohli, Pushmeet

    Motion Segmentation of Truncated Signed Distance Function based Volumetric Surfaces Samunda Perera. Introduction The Truncated Signed Distance Function (TSDF) based volumetric surface representation format [4 the problem of segmenting such a volumetric surface reconstruction of a scene into distinctively moving

  7. Parallel grid population

    DOE Patents [OSTI]

    Wald, Ingo; Ize, Santiago

    2015-07-28

    Parallel population of a grid with a plurality of objects using a plurality of processors. One example embodiment is a method for parallel population of a grid with a plurality of objects using a plurality of processors. The method includes a first act of dividing a grid into n distinct grid portions, where n is the number of processors available for populating the grid. The method also includes acts of dividing a plurality of objects into n distinct sets of objects, assigning a distinct set of objects to each processor such that each processor determines by which distinct grid portion(s) each object in its distinct set of objects is at least partially bounded, and assigning a distinct grid portion to each processor such that each processor populates its distinct grid portion with any objects that were previously determined to be at least partially bounded by its distinct grid portion.

  8. The isogeometric segmentation pipeline

    E-Print Network [OSTI]

    Jüttler, Bert

    The isogeometric segmentation pipeline M. Pauley, Dang-Manh Nguyen, D. Mayer, J. Speh, O. Weeger, Bert J¨uttler G+S Report No. 31 June 2015 #12;The isogeometric segmentation pipeline Michael Pauley, Dang-Manh Nguyen, David Mayer, Jaka Speh, Oliver Weeger, Bert Jüttler Abstract We present a pipeline

  9. Colour Image Segmentation Wladyslaw Skarbek

    E-Print Network [OSTI]

    Koschan, Andreas

    Colour Image Segmentation A Survey Wladyslaw Skarbek Institute of Computer Science Polish Academy . . . . . . . . . . . . . . . . . . . . . . . . 23 4.2.1 Colour image segmentation and labeling through multiediting and condensing

  10. Partially segmented deformable mirror

    DOE Patents [OSTI]

    Bliss, Erlan S. (Danville, CA); Smith, James R. (Livermore, CA); Salmon, J. Thaddeus (Livermore, CA); Monjes, Julio A. (San Ramon, CA)

    1991-01-01

    A partially segmented deformable mirror is formed with a mirror plate having a smooth and continuous front surface and a plurality of actuators to its back surface. The back surface is divided into triangular areas which are mutually separated by grooves. The grooves are deep enough to make the plate deformable and the actuators for displacing the mirror plate in the direction normal to its surface are inserted in the grooves at the vertices of the triangular areas. Each actuator includes a transducer supported by a receptacle with outer shells having outer surfaces. The vertices have inner walls which are approximately perpendicular to the mirror surface and make planar contacts with the outer surfaces of the outer shells. The adhesive which is used on these contact surfaces tends to contract when it dries but the outer shells can bend and serve to minimize the tendency of the mirror to warp.

  11. Segmenter for Chinese Kalle Beneus

    E-Print Network [OSTI]

    Segmenter for Chinese Kalle Ben´eus Department of Computer Science Lund University, Sweden d04kb This article examines different methods of word segmentation for Chinese. First we look at some of Chinese. This includes studying their effectiveness in simple implementa- tions as well as looking

  12. Segment Protection Models M Vinod Kumar

    E-Print Network [OSTI]

    Karandikar, Abhay

    · Infrastructure Segment (IS): · Data-path Segment (DS): · BB-BEB: 3-tupple translation bridge that translates- Ethertype · Segmented Domain Model ­ Segmented Q-in-Q ­ Segmented PBB-TE (B-B BEB) #12;6 Server Layer Models 1. Triple MAC 2. Triple Q #12;7 Triple MAC #12;8 Triple MAC (SEB in middle) IB-BEB BCB I

  13. 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)

    1999-01-01

    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.

  14. Solar Distinction | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EIS ReportEurope GmbH JumpSlough HeatMccoyProject- phaseDistinction Jump

  15. In Asia, there are two distinct types of chum salmon (Oncorhynchus

    E-Print Network [OSTI]

    - ing Kamchatka, the Sea of Okhotsk, the east coast of Sakhalin Island, and the Amur River. Later, and populations from Pri- morye, Sakhalin Island, and north- east Russia were the most distinct. Microsatellite

  16. Three Essays on Segment Reporting

    E-Print Network [OSTI]

    Wang, Qian

    2009-08-31

    Segment information is vital, essential, fundamental, indispensable, and integral in the process of projecting companies' performance (AIMR, 1993). The purpose of this dissertation is to investigate the causes and consequences ...

  17. Dynamic models for nonstationary signal segmentation

    E-Print Network [OSTI]

    Penny, Will

    Dynamic models for nonstationary signal segmentation William D. Penny and Stephen J. Roberts w.penny

  18. 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)

    2014-04-15

    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.

  19. Optimal segmentation and packaging process

    DOE Patents [OSTI]

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

    1999-08-10

    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.

  20. Distinct Mechanisms of Recognizing Endosomal Sorting Complex...

    Office of Scientific and Technical Information (OSTI)

    Distinct Mechanisms of Recognizing Endosomal Sorting Complex Required for Transport III (ESCRT-III) Protein IST1 by Different Microtubule Interacting and Trafficking (MIT) Domains...

  1. A material segmentation and classification system

    E-Print Network [OSTI]

    Wong, Jennifer L

    2013-01-01

    In this thesis, I developed a material segmentation and classification system that takes in images of an object and identifies the material composition of the object's surface. The 3D surface is first segmented into regions ...

  2. 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

  3. @ work' video segment features Robotic Software Engineer

    ScienceCinema (OSTI)

    Idaho National Laboratory

    2010-01-08

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

  4. Flood Damage Reduction Segment / System Inspection Report

    E-Print Network [OSTI]

    US Army Corps of Engineers

    and Concrete I-walls Interior Drainage System Pump Stations Contents of Report: FDR System Channels Note the levee segment / system maintenance program. 1. Levee segment / system and district: (name of the segment of maintenance required by last inspection report: 4. Summary of maintenance performed this reporting period: 5

  5. A non parametric approach for histogram segmentation

    E-Print Network [OSTI]

    Desolneux, Agnès

    considers a rigorous definition of an admissible segmentation, avoiding over and under-segmentation problems of Gaussians, for example, luminance histograms of natural images, as we shall see in the experimental section segments by minimizing some energy criterion (variance, entropy, etc...). In all cases, the number of modes

  6. Segmented ceramic liner for induction furnaces

    DOE Patents [OSTI]

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

    1994-07-26

    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.

  7. Segmented ceramic liner for induction furnaces

    DOE Patents [OSTI]

    Gorin, Andrew H. (Knoxville, TN); Holcombe, Cressie E. (Knoxville, TN)

    1994-01-01

    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.

  8. Cooling system for three hook ring segment

    DOE Patents [OSTI]

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

    2014-08-26

    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.

  9. Fluidized bed boiler having a segmented grate

    DOE Patents [OSTI]

    Waryasz, Richard E. (Longmeadow, MA)

    1984-01-01

    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.

  10. 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

  11. ANATOMICAL GUIDED SEGMENTATION WITH NON-STATIONARY TISSUE CLASS DISTRIBUTIONS IN AN EXPECTATION-MAXIMIZATION FRAMEWORK

    E-Print Network [OSTI]

    knowledge of the anatom- ical structures have shown promising results. This prior in- formation is often model of a structure and principal modes of variations based on a sample population [2, 3, 4, 5]. When a new subject needs to be segmented, the model is deformed to best fit the subject's image data

  12. DEAN'S LIST WITH DISTINCTION Spring Semester 2010

    E-Print Network [OSTI]

    Wong, Pak Kin

    Rheinheimer, Paul E Rice, Adam T. Rice, Sean Christopher Richards, Robert G. Roberts, Meredith A. Romero, Emanuel J. Rosser, David Ryan, Christopher T. Sarmiento, Sonia Schultz, Robert G. Shen, Xiaolong ShinDEAN'S LIST WITH DISTINCTION Spring Semester 2010 Hale, Erwin A. Hari, Gautam Harshman, Dustin K

  13. Evidence for distinct stocks of king mackerel,

    E-Print Network [OSTI]

    Evidence for distinct stocks of king mackerel, Scomberomorus cavalla, in the Gulf of Mexico Allyn G.-Evidence support- ing a two stock hypothesis for king mackerel, Scomberornorus cavalla, in the Gulf of Mexico. There are two identifiable stocks of king mackel'el in the Gulf of Mexico: a western stock and an eastern stock

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

    DOE Patents [OSTI]

    Lenox, Carl

    2013-11-05

    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.

  15. Vessel segmentation for angiographic enhancement and analysis

    E-Print Network [OSTI]

    Lübeck, Universität zu

    Vessel segmentation for angiographic enhancement and analysis Alexandru Condurache1 , Til Aach1@isip.uni-luebeck.de Abstract. Angiography is a widely used method of vessel imaging for the diagnosis and treatment of pathological manifestations as well as for medical research. Vessel segmentation in angiograms is useful

  16. Exploratory Dijkstra forest based automatic vessel segmentation

    E-Print Network [OSTI]

    Tomasi, Carlo

    , and follows vessel branching naturally and efficiently. To test our method, we constructed a retinal video code freely available online. © 2012 Optical Society of America OCIS codes: (100.0100) Image processing, "Automatic segmentation of seven retinal layers in SDOCT images congruent with expert manual segmentation

  17. Stochastic State Transitions Give Rise to Phenotypic Equilibrium in Populations of Cancer Cells

    E-Print Network [OSTI]

    Fillmore, Christine M.

    Cancer cells within individual tumors often exist in distinct phenotypic states that differ in functional attributes. While cancer cell populations typically display distinctive equilibria in the proportion of cells in ...

  18. Distinct superconducting states in the pressure-induced metallic...

    Office of Scientific and Technical Information (OSTI)

    Distinct superconducting states in the pressure-induced metallic structures of the nominal semimetal Bi4Te3 Citation Details In-Document Search Title: Distinct superconducting...

  19. Dual Polynomials for Collision and Element Distinctness

    E-Print Network [OSTI]

    Mark Bun; Justin Thaler

    2015-03-25

    The approximate degree of a Boolean function $f: \\{-1, 1\\}^n \\to \\{-1, 1\\}$ is the minimum degree of a real polynomial that approximates $f$ to within error $1/3$ in the $\\ell_\\infty$ norm. In an influential result, Aaronson and Shi (J. ACM 2004) proved tight $\\tilde{\\Omega}(n^{1/3})$ and $\\tilde{\\Omega}(n^{2/3})$ lower bounds on the approximate degree of the Collision and Element Distinctness functions, respectively. Their proof was non-constructive, using a sophisticated symmetrization argument and tools from approximation theory. More recently, several open problems in the study of approximate degree have been resolved via the construction of dual polynomials. These are explicit dual solutions to an appropriate linear program that captures the approximate degree of any function. We reprove Aaronson and Shi's results by constructing explicit dual polynomials for the Collision and Element Distinctness functions.

  20. Epistemological Distinctions Between Science and History

    E-Print Network [OSTI]

    Michael Courtney; Amy Courtney

    2008-03-31

    This article describes epistemological distinctions between science and history. Science investigates models of natural law using repeatable experiments as the ultimate arbiter. In contrast, history investigates past events by considering physical evidence, documentary evidence, and eyewitness testimony. Because questions of natural law are repeatably testable by any audience that exercises due experimental care, models of natural law are inherently more objective and testable with greater certainty than theories of past events.

  1. The Effect of SFAS No. 131 on the Cross-Segment Variability of Profits Reported by Multiple Segment Firms

    E-Print Network [OSTI]

    Ettredge, Michael L.; Kwon, Soo Young; Smith, David B.; Stone, Mary S.

    2006-01-01

    Our study assesses whether SFAS No. 131 improved disclosure about the diversity of multiple segment firms’ operations. We find a post-SFAS No. 131 increase in cross-segment variability of segment profits, an increase in ...

  2. Audience Segmentation and Analysis Strategies for Targeted Marketing...

    Energy Savers [EERE]

    Audience Segmentation and Analysis Strategies for Targeted Marketing (101) Audience Segmentation and Analysis Strategies for Targeted Marketing (101) September 24, 2015 12:30PM to...

  3. Market Segmentation and Energy Efficiency Program Design (2008...

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

    Market Segmentation and Energy Efficiency Program Design (2008 CIEE Report) Market Segmentation and Energy Efficiency Program Design (2008 CIEE Report) This paper describes the...

  4. Newport News in Review, ch. 47, segment includes TEDF groundbreaking...

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

    https:www.jlab.orgnewsarticlesnewport-news-review-ch-47-segment-includes-tedf-groundbreaking-event Newport News in Review, ch. 47, segment includes TEDF groundbreaking event...

  5. 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...

  6. 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

  7. PERCEIVING PHONETIC SEGMENTS* Michael Studdert-Kennedy+

    E-Print Network [OSTI]

    PERCEIVING PHONETIC SEGMENTS* Michael Studdert-Kennedy+ Why do we study Is the a acoustic structure & Studdert-Kennedy, 1978L First, I assume the abstract elements of phoneme or feature that underlie

  8. Customer service driven supply chain segmentation

    E-Print Network [OSTI]

    Worawattananon, Prakit

    2008-01-01

    The objective of this thesis is to develop a supply chain segmentation model for Company X, which is in the chemical and construction materials industry. The company sells products in an expanding Southeast Asia market. ...

  9. Vane segment support and alignment device

    DOE Patents [OSTI]

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

    1999-07-13

    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.

  10. Phonology impacts segmentation in online speech processing 

    E-Print Network [OSTI]

    Onnis, Luca; Monaghan, Padraic; Richmond, Korin; Chater, Nick

    2005-01-01

    Peña, Bonatti, Nespor and Mehler(2002) investigated an artificial language where the structure of words was determined by nonadjacent dependencies between syllables. They found that segmentation of continuous speech could ...

  11. Segmentation strategies for polymerized volume data sets 

    E-Print Network [OSTI]

    Doddapaneni, Venkata Purna

    2006-04-12

    A new technique, called the polymerization algorithm, is described for the hierarchical segmentation of polymerized volume data sets (PVDS) using the Lblock data structure. The Lblock data structure is defined as a ...

  12. Prosodic phrase segmentation by pitch pattern clustering 

    E-Print Network [OSTI]

    Shimodaira, Hiroshi; Nakai, Mitsuru

    This paper proposes a novel method for detecting the optimal sequence of prosodic phrases from continuous speech based on data-driven approach. The pitch pattern of input speech is divided into prosodic segments which ...

  13. ngravs: Distinct gravitational interactions in GADGET-2

    E-Print Network [OSTI]

    Croker, K A S

    2015-01-01

    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.

  14. On Count/Mass Distinction in Slovene

    E-Print Network [OSTI]

    Mitrovi?, Moreno

    2011-01-01

    there is rabbit in this stew ? there is rabbit meat in this stew #10 A (predominately) mass noun can be made count we store three bloods ? we store three blood types Section 3 overviews these properties with regards to their application to Slovene. We... we store three bloods ? we store three blood types I regard and convert Chiercia’s ten properties for count/mass distinction into tests: I apply test #1 in §3.2.1, test #2 in §3.2.2, tests #4-7 in §3.2.3, test #8 in §3.2.4, and tests #9 and #10...

  15. Household Energy Consumption Segmentation Using Hourly Data

    SciTech Connect (OSTI)

    Kwac, J; Flora, J; Rajagopal, R

    2014-01-01

    The increasing US deployment of residential advanced metering infrastructure (AMI) has made hourly energy consumption data widely available. Using CA smart meter data, we investigate a household electricity segmentation methodology that uses an encoding system with a pre-processed load shape dictionary. Structured approaches using features derived from the encoded data drive five sample program and policy relevant energy lifestyle segmentation strategies. We also ensure that the methodologies developed scale to large data sets.

  16. Image Segmentation Methods for Detecting Blood Vessels in Angiography

    E-Print Network [OSTI]

    Chung, Albert C. S.

    Image Segmentation Methods for Detecting Blood Vessels in Angiography Albert C. S. Chung Lo Kwee-assisted detection and segmentation of blood vessels in angiography are crucial for endovascular treat- ments--Segmentation of Blood Vessels, Feature Detection, Statistical Segmentation, Active Contour Model, Angiography I

  17. Sidescan sonar segmentation using active contours and level set methods

    E-Print Network [OSTI]

    Petillot, Yvan

    . An unsupervised binary segmentation algoritm for texture- based seabed discrimination is presented. It relies

  18. 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

  19. Automatic Subcortical Segmentation Using a Contextual Model

    E-Print Network [OSTI]

    Thompson, Paul

    's Disease Research Center, Los Angeles, CA, USA Abstract. Automatically segmenting subcortical structures, we develop a framework based on machine learning to learn a unified appearance and context model. We patients, 22 with mild cognitive im- pairment, and 26 normal healthy controls). Using standard distance

  20. Actin Filament Segmentation Using Dynamic Programming

    E-Print Network [OSTI]

    Huang, Xiaolei

    Actin Filament Segmentation Using Dynamic Programming Hongsheng Li, Tian Shen, and Xiaolei Huang for actin filament segmen- tation in 2D TIRFM image sequences. This problem is difficult because actin filaments dynamically change shapes during their growth, and the TIRFM images are usually noisy. We ask

  1. SEGMENT ORDER PRESERVING COPYING GARBAGE COLLECTION

    E-Print Network [OSTI]

    Tarau, Paul

    allows instant reclaiming and in fact, the MALI­ implementation [11] contains a bottom­up copying part reclaiming, but actually can improve it by moving objects to newer segments when this is allowed. MALI has, this property of MALI was never recognized, not even by its authors. Also, due to its data representation, MALI

  2. Generative probabilistic models for object segmentation 

    E-Print Network [OSTI]

    Eslami, Seyed Mohammadali

    2014-06-27

    One of the long-standing open problems in machine vision has been the task of ‘object segmentation’, in which an image is partitioned into two sets of pixels: those that belong to the object of interest, and those that do ...

  3. 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

  4. Industry Analysis and Customer Segmentation Company Description

    E-Print Network [OSTI]

    Dahl, David B.

    : A leading health care company, serving more than 75 million people worldwide. Our family of companiesIndustry Analysis and Customer Segmentation Company Description: Our company specializes will research geographic market share by brand/company. The final deliverable will be a prioritized list

  5. Distinct optical properties of relativistically degenerate matter

    SciTech Connect (OSTI)

    Akbari-Moghanjoughi, M.

    2014-06-15

    In this paper, we use the collisional quantum magnetohydrodynamic (CQMHD) model to derive the transverse dielectric function of a relativistically degenerate electron fluid and investigate various optical parameters, such as the complex refractive index, the reflection and absorption coefficients, the skin-depth and optical conductivity. In this model we take into accounts effects of many parameters such as the atomic-number of the constituent ions, the electron exchange, electron diffraction effect and the electron-ion collisions. Study of the optical parameters in the solid-density, the warm-dense-matter, the big-planetary core, and the compact star number-density regimes reveals that there are distinct differences between optical characteristics of the latter and the former cases due to the fundamental effects of the relativistic degeneracy and other quantum mechanisms. It is found that in the relativistic degeneracy plasma regime, such as found in white-dwarfs and neutron star crusts, matter possess a much sharper and well-defined step-like reflection edge beyond the x-ray electromagnetic spectrum, including some part of gamma-ray frequencies. It is also remarked that the magnetic field intensity only significantly affects the plasma reflectivity in the lower number-density regime, rather than the high density limit. Current investigation confirms the profound effect of relativistic degeneracy on optical characteristics of matter and can provide an important plasma diagnostic tool for studying the physical processes within the wide scope of quantum plasma regimes be it the solid-density, inertial-confined, or astrophysical compact stars.

  6. Molecular analysis of endothelial progenitor cell (EPC) subtypes reveals two distinct cell populations with different identities

    E-Print Network [OSTI]

    Medina, Reinhold J.; O'Neill, Christina L.; Sweeney, Mark; Guduric-Fuchs, Jasenka; Gardiner, Tom A.; Simpson, David A.; Stitt, Alan W.

    2010-05-13

    products were resolved by 2% agarose gel electrophoresis. Real time RT-PCR Quantitative real time RT-PCR reactions were performed in a 10 ?l volume containing 2 ?l of 1:15 diluted cDNA template, 0.5 ?M of sense and anti-sense primers (Invit- rogen), and 5... stepwise fashion (Step 1: 500 volts, 1 mA, 5 watts(W) and 5 volt hours (Vhrs); step 2: 3500 volts, 1 mA, 5 W and 5200 Vhrs; and step 3: 3000 volts, 1 mA, 5 W and 3500 Vhrs). After IEF, reduction and alkylation of thiol groups was performed by immersing...

  7. Two developmentally distinct populations of neural crest cells contribute to the zebrafish heart

    E-Print Network [OSTI]

    Cavanaugh, AM; Huang, J; Chen, JN

    2015-01-01

    3 identi?es a second heart ?eld in zeb- ra?sh. Nature 474,growth of the zebra?sh heart. Development 136, 1633–1641.layer regulates zebra?sh heart tube morphogenesis. Dev.

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

    E-Print Network [OSTI]

    Waletzko, Ryan Scott

    2009-01-01

    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 ...

  9. Smart Meter Driven Segmentation: What Your Consumption Says About You

    SciTech Connect (OSTI)

    Albert, A; Rajagopal, R

    2013-11-01

    With the rollout of smart metering infrastructure at scale, demand-response (DR) programs may now be tailored based on users' consumption patterns as mined from sensed data. For issuing DR events it is key to understand the inter-temporal consumption dynamics as to appropriately segment the user population. We propose to infer occupancy states from consumption time series data using a hidden Markov model framework. Occupancy is characterized in this model by 1) magnitude, 2) duration, and 3) variability. We show that users may be grouped according to their consumption patterns into groups that exhibit qualitatively different dynamics that may be exploited for program enrollment purposes. We investigate empirically the information that residential energy consumers' temporal energy demand patterns characterized by these three dimensions may convey about their demographic, household, and appliance stock characteristics. Our analysis shows that temporal patterns in the user's consumption data can predict with good accuracy certain user characteristics. We use this framework to argue that there is a large degree of individual predictability in user consumption at a population level.

  10. Accent phrase segmentation using transition probabilities between pitch pattern templates. 

    E-Print Network [OSTI]

    Shimodaira, Hiroshi; Nakai, Mitsuru

    1993-01-01

    This paper proposes a novel method for segmenting continuous speech into accent phrases by using a prosodic feature 'pitch pattern'. The pitch pattern extracted from input speech signals is divided into the accent segments ...

  11. Automatic topic segmentation and labeling in multiparty dialogue 

    E-Print Network [OSTI]

    Hsueh, Pei-Yun; Moore, Johanna D.

    2010-11-04

    This study concerns how to segment a scenario-driven multiparty dialogue and how to label these segments automatically. We apply approaches that have been proposed for identifying topic boundaries at a coarser level to ...

  12. Piecing Together the Segmentation Jigsaw using Context , Arpit Jain

    E-Print Network [OSTI]

    Daume III, Hal

    - tion formulation is minimized using an efficient quadratic programming solver and an approximate, segmentation al- gorithms will generally not combine the roof and the body of the car into one segment due

  13. Chinese Word Segmentation in MSR-NLP Microsoft Research

    E-Print Network [OSTI]

    Chinese Word Segmentation in MSR-NLP Andi Wu Microsoft Research One Microsoft Way, Redmond, WA 98052 andiwu@microsoft.com Abstract Word segmentation in MSR-NLP is an in- tegral part of a sentence analyzer which includes basic segmentation, derivational morphology, named entity recognition, new word

  14. Volumetric Layer Segmentation Using Coupled Surfaces Propagation Xiaolan Zengy

    E-Print Network [OSTI]

    Duncan, James S.

    Volumetric Layer Segmentation Using Coupled Surfaces Propagation Xiaolan Zengy , Lawrence H. Staiby: xiaolan.zeng@yale.edu Abstract The problem of segmenting a volumetric layer of - nite thickness. In the analysis of such data, we of- ten encounter the problem of segmenting a volumetric layer of nite thickness

  15. Appendix B Volumetric Segmentation 12.1 Introduction

    E-Print Network [OSTI]

    Bowden, Richard

    204 Appendix B ­ Volumetric Segmentation 12 12.1 Introduction The availability and clinical in the processing and segmentation of volumetric data. The problems of understanding 3D structure from a discretely of volumetric data is greatly simplified by the successful segmentation of surface topology. Surfaces

  16. A Distinction Technique Between Volcanic And Tectonic Depression...

    Open Energy Info (EERE)

    Distinction Technique Between Volcanic And Tectonic Depression Structures Based On The Restoration Modeling Of Gravity Anomaly- A Case Study Of The Hohi Volcanic Zone, Central...

  17. Segmented nanowires displaying locally controllable properties

    DOE Patents [OSTI]

    Sutter, Eli Anguelova; Sutter, Peter Werner

    2013-03-05

    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.

  18. Distinct mechanisms for the representation of moving and static objects

    E-Print Network [OSTI]

    Kourtzi, Zoe

    Distinct mechanisms for the representation of moving and static objects Zoe Kourtzi Department two distinct representa- tional mechanisms: a static object mechanism rather spatially refined in the way moving and static objectsare rep- resented by testing for priming effects to previously seen

  19. 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)

    2012-03-15

    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.

  20. Motivation Overview Automatic Segmentation Algorithm Building Colour Models Volumetric Graph-Cut Results Conclusion Automatic 3D Object Segmentation in Multiple

    E-Print Network [OSTI]

    Esteban, Carlos Hernández

    Motivation Overview Automatic Segmentation Algorithm Building Colour Models Volumetric Graph Segmentation in Multiple Views using Volumetric Graph-Cuts #12;Motivation Overview Automatic Segmentation Algorithm Building Colour Models Volumetric Graph-Cut Results Conclusion Motivation Neill Campbell, George

  1. 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's, including MARK, SAS, DISTANCE, and others. We'll often use the "recitation session" to get you started Cooch and Gary White #12;Population Analysis, Fall 2005 2 2001) that can also be downloaded from Evan

  2. A Dielectric Relaxometry Study of Segmental Dynamics in PDMS...

    Office of Scientific and Technical Information (OSTI)

    A Dielectric Relaxometry Study of Segmental Dynamics in PDMSBoron Composite and Hybrid Elastomers Citation Details In-Document Search Title: A Dielectric Relaxometry Study of...

  3. Cutting assembly including expanding wall segments of auger

    DOE Patents [OSTI]

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

    1983-01-01

    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.

  4. 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...

  5. 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).

  6. Fast Neutron Detection with a Segmented Spectrometer

    E-Print Network [OSTI]

    T. J. Langford; C. D. Bass; E. J. Beise; H. Breuer; D. K. Erwin; C. R. Heimbach; J. S. Nico

    2014-11-20

    A fast neutron spectrometer consisting of segmented plastic scintillator and He-3 proportional counters was constructed for the measurement of neutrons in the energy range 1 MeV to 200 MeV. We discuss its design, principles of operation, and the method of analysis. The detector is capable of observing very low neutron fluxes in the presence of ambient gamma background and does not require scintillator pulseshape discrimination. The spectrometer was characterized for its energy response in fast neutron fields of 2.5 MeV and 14 MeV, and the results are compared with Monte Carlo simulations. Measurements of the fast neutron flux and energy response at 120 m above sea-level (39.130 deg. N, 77.218 deg. W) and at a depth of 560 m in a limestone mine are presented. Finally, the design of a spectrometer with improved sensitivity and energy resolution is discussed.

  7. Speech/Nonspeech Segmentation in Web Videos Ananya Misra

    E-Print Network [OSTI]

    Cortes, Corinna

    Speech/Nonspeech Segmentation in Web Videos Ananya Misra Google, New York, NY, USA amisra, we investigate alternative audio features and a discriminative classifier, which together yield for segmentation include frame energy-based meth- ods and Gaussian mixture models (GMMs) trained on Mel- frequency

  8. Lung Segmentation from CT with Severe Pathologies Using Anatomical Constraints

    E-Print Network [OSTI]

    Lung Segmentation from CT with Severe Pathologies Using Anatomical Constraints Neil Birkbeck Healthcare, Oxford, UK Abstract. The diversity in appearance of diseased lung tissue makes automatic segmentation of lungs from CT with severe pathologies chal- lenging. To overcome this challenge, we rely

  9. The zebrafish pronephros: A model to study nephron segmentation

    E-Print Network [OSTI]

    Tank, Jennifer L.

    . Achieving an understanding of the mechanisms that direct nephron segmentation has the potential to shed to direct segment fates during mammalian nephrogenesis. These findings present the zebrafish model) that transports the modified filtrate to a waste disposal site. In mammals and other amniotes, the pronephros

  10. Towards Optimal Capacity Segmentation with Hybrid Cloud Pricing

    E-Print Network [OSTI]

    Li, Baochun

    between periodic auctions and EC2 spot market. Furthermore, we formulate the optimal capacity segmentationTowards Optimal Capacity Segmentation with Hybrid Cloud Pricing Wei Wang, Baochun Li, and Ben Liang Department of Electrical and Computer Engineering University of Toronto Abstract--Cloud resources are usually

  11. Towards Optimal Capacity Segmentation with Hybrid Cloud Pricing

    E-Print Network [OSTI]

    Liang, Ben

    and EC2 spot market. Furthermore, we formulate the optimal capacity segmentation strategy as a MarkovTowards Optimal Capacity Segmentation with Hybrid Cloud Pricing Wei Wang, Baochun Li, and Ben Liang Department of Electrical and Computer Engineering University of Toronto Toronto, ON M5S 3G4, Canada weiwang

  12. 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

  13. Automatic Labeling and Segmentation of Vertebrae in CT Images

    E-Print Network [OSTI]

    Freitas, Nando de

    vertebral column. I validate my technique in terms of accuracy of the labeling and segmentation of CT images handled labeling of the vertebral column in arbitrary scans [3, 4]. Klinder et al. build a template (mean(s) Affiliation Address email Abstract Detection, Labeling, and segmentation of the spinal column from CT images

  14. Global Curvature Analysis and Segmentation Volumetric Data Sets

    E-Print Network [OSTI]

    Rivlin, Ehud

    Global Curvature Analysis and Segmentation of Volumetric Data Sets Using Trivariate B and mean curvatures of an entire volumetric data set, using a trivariate B-spline volu- metric to globally segment the images into volumetric regions that contain convex or concave ´ellipticµ iso

  15. Global Segmentation and Curvature Analysis of Volumetric Data Sets Using

    E-Print Network [OSTI]

    Rivlin, Ehud

    Global Segmentation and Curvature Analysis of Volumetric Data Sets Using Trivariate B presents a method to globally segment volumetric images into regions that contain convex or concave (elliptic) iso-surfaces, planar or cylindrical (parabolic) iso-surfaces, and volumetric regions with saddle

  16. A Bayesian Approach for Image Segmentation with Shape Priors

    SciTech Connect (OSTI)

    Chang, Hang; Yang, Qing; Parvin, Bahram

    2008-06-20

    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.

  17. Molecular Cell HP1 Proteins Form Distinct Complexes

    E-Print Network [OSTI]

    , two HP1 homologs, Swi6 and Chp2, function in heterochromatic gene silencing, but their relative contribution to silencing remains unknown. Here we show that Swi6 and Chp2 exist in nonoverlapping complexes and make distinct contributions to silencing. Chp2 associates with the SHREC histone deacetylase complex

  18. ORIGINAL ARTICLE Identification and functional characterization of the distinct plant

    E-Print Network [OSTI]

    Pauly, Markus

    ORIGINAL ARTICLE Identification and functional characterization of the distinct plant pectin their physical properties such as gelling capacity, an important trait for the food industry. In order to gain to investigate the function of genes that are members of the Pectin AcetylEsterase gene family (PAE

  19. Evolutionary developmental biology (evodevo) emerged as a distinct field of

    E-Print Network [OSTI]

    Müller, Gerd B.

    Evolutionary developmental biology (evo­devo) emerged as a distinct field of research in the early of developmental processes of different taxa at the molecular level. Today, evo­devo research is characterized two decades, at least four major research programmes have formed in evo­devo, although

  20. 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

    2012-07-05

    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.

  1. 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

  2. Recognizing deviations from normalcy for brain tumor segmentation

    E-Print Network [OSTI]

    Gering, David T. (David Thomas), 1971-

    2003-01-01

    A framework is proposed for the segmentation of brain tumors from MRI. Instead of training on pathology, the proposed method trains exclusively on healthy tissue. The algorithm attempts to recognize deviations from normalcy ...

  3. Curved track segment finding using Tiny Triplet Finder (TTF)

    SciTech Connect (OSTI)

    Wu, Jin-Yuan; Wang, M.; Gottschalk, E.; Shi, Z.; /Fermilab

    2006-11-01

    We describe the applications of a track segment recognition scheme called the Tiny Triplet Finder (TTF) that involves the grouping of three hits satisfying a constraint forming of a track segment. The TTF was originally developed solving straight track segment finding problem, however, it is also suitable in many curved track segment finding problems. The examples discussed in this document are among popular detector layouts in high-energy/nuclear physics experiments. Although it is not practical to find a universal recipe for arbitrary detector layouts, the method of the TTF application is illustrated via the discussion of the examples. Generally speaking, whenever the data item to be found in a pattern recognition problem contains two free parameters, and if the constraint connecting the measurements and the two free parameters has an approximate shift invariant property, the Tiny Triplet Finder can be used.

  4. Interactive Whole-Heart Segmentation in Congenital Heart Disease

    E-Print Network [OSTI]

    Pace, Danielle Frances

    We present an interactive algorithm to segment the heart chambers and epicardial surfaces, including the great vessel walls, in pediatric cardiac MRI of congenital heart disease. Accurate whole-heart ...

  5. Geometric Applications of the Split Bregman Method: Segmentation and Surface

    E-Print Network [OSTI]

    Ferguson, Thomas S.

    algorithm.coupled shrinkage donoho We also consider the related prob- lem of surface reconstruction from segmentation, this paper will focus on recently proposed methods which can be cast in the form of totally

  6. Piecing Together the Segmentation Jigsaw using Context , Arpit Jain

    E-Print Network [OSTI]

    Daume III, Hal

    with appearance matching. This relaxed cost func- tion formulation is minimized using an efficient quadratic. For example, for the image shown in Figure 1, segmentation al- gorithms will generally not combine the roof

  7. Line and Net Pattern Segmentation Using Shape Modeling Adam Huanga

    E-Print Network [OSTI]

    : Image processing, image enhancement, image segmentation, feature extraction, matched filter, crest lines of blood vessels in retinal images: 1) Blood vessels usually have small curvatures and can be approximated

  8. Segmented instrumentation tube including a locking sleeve for interlocking the segments of the instrumentation tube

    DOE Patents [OSTI]

    Obermeyer, F.D.

    1993-11-16

    Segmented instrumentation tube including a locking sleeve for interlocking the segments of the instrumentation tube, so that the threaded ends of the instrumentation tube do not unthread when subjected to vibration, such an instrumentation tube being suitable for use in a nuclear reactor pressure vessel. The instrumentation tube has a first member having a threaded end portion that has a plurality of first holes circumferentially around the outside surface thereof. The instrumentation tube also has a second member having a threaded end portion that has a plurality of second holes circumferentially around the outside surface thereof. The threads of the second member are caused to threadably engage the threads of the first member for defining a threaded joint there between. A sleeve having an inside surface surrounds the end portion of the first member and the end portion of the second member and thus surrounds the threaded joint. The sleeve includes a plurality of first projections and second projections that outwardly extend from the inside surface to engage the first holes and the second holes, respectively. The outside surface of the sleeve is crimped or swaged at the locations of the first projections and second projections such that the first projections and the second projections engage their respective holes. In this manner, independent rotation of the first member with respect to the second member is prevented, so that the instrumentation tube will not unthread at its threaded joint. 10 figures.

  9. Axes determination for segmented true-coaxial HPGe detectors

    E-Print Network [OSTI]

    I. Abt; A. Caldwell; J. Liu; B. Majorovits; P. Petrov; O. Volynets

    2012-03-26

    A fast method to determine the crystallographic axes of segmented true-coaxial high-purity germanium detectors is presented. It is based on the analysis of segment-occupancy patterns obtained by irradiation with radioactive sources. The measured patterns are compared to predictions for different axes orientations. The predictions require a simulation of the trajectories of the charge carriers taking the transverse anisotropy of their drift into account.

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

    E-Print Network [OSTI]

    Ramel, Marie-Christine

    2001-01-01

    the UAS/GAL4 (Brand and Perrimon, 1993) system gives rise to tarsal segment fusions (Buckles et al. , in preparation). The fusion phenotype is not observed when a form of Abl lacking the kinase activity is over-expressed, hence the kinase function... tested for dominant enhancement of the GOF ab/ fusion phenotype. Seventeen interacting loci were recovered: one copy of the deficiency in that sensitized background was sufficient to give a leg phenotype (tarsal segment fusion, ectopic joints, shorter...

  11. A CoA Co--Evaluation Framework forEvaluation Framework for Improving Segmentation EvaluationImproving Segmentation Evaluation

    E-Print Network [OSTI]

    Fritts, Jason

    [ Taxonomy ] Segmentation Evaluation #12;Relative Evaluation (a.k.a. Empirical Discrepancy Measures) Most;Stand-alone Evaluation (a.k.a. empirical goodness measures) No reference image is needed Examine how

  12. Automatic Adaptation of Annotation Standards: Chinese Word Segmentation and POS Tagging A Case Study

    E-Print Network [OSTI]

    Cortes, Corinna

    Automatic Adaptation of Annotation Standards: Chinese Word Segmentation and POS Tagging ­ A Case segmentation and part-of-speech tagging, where no segmentation and POS tagging standards are widely accepted visited-China Figure 1: Incompatible word segmentation and POS tagging standards between CTB (upper

  13. Sorting of influenza A virus RNA genome segments after nuclear export

    SciTech Connect (OSTI)

    Takizawa, Naoki [Department of Infection Biology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575 (Japan); Laboratory of Molecular Biology of Infectious Agents, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521 (Japan); Kumakura, Michiko; Takeuchi, Kaoru [Department of Infection Biology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575 (Japan); Kobayashi, Nobuyuki [Laboratory of Molecular Biology of Infectious Agents, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521 (Japan); Nagata, Kyosuke, E-mail: knagata@md.tsukuba.ac.j [Department of Infection Biology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8575 (Japan)

    2010-06-05

    The genome of the influenza A virus consists of eight different segments. These eight segments are thought to be sorted selectively in infected cells. However, the cellular compartment where segments are sorted is not known. We examined using temperature sensitive (ts) mutant viruses and cell fusion where segments are sorted in infected cells. Different cells were infected with different ts mutant viruses, and these cells were fused. In fused cells, genome segments are mixed only in the cytoplasm, because M1 prevents their re-import into the nucleus. We made a marker ts53 virus, which has silent mutations in given segments and determined the reassortment frequency on all segments using ts1 and marker ts53. In both co-infected and fused cells, all of marker ts53 segments and ts1 segments were incorporated into progeny virions in a random fashion. These results suggest that influenza virus genome segments are sorted after nuclear export.

  14. A New Approach to Lung Image Segmentation using Fuzzy Possibilistic C-Means Algorithm

    E-Print Network [OSTI]

    Gomathi, M

    2010-01-01

    Image segmentation is a vital part of image processing. Segmentation has its application widespread in the field of medical images in order to diagnose curious diseases. The same medical images can be segmented manually. But the accuracy of image segmentation using the segmentation algorithms is more when compared with the manual segmentation. In the field of medical diagnosis an extensive diversity of imaging techniques is presently available, such as radiography, computed tomography (CT) and magnetic resonance imaging (MRI). Medical image segmentation is an essential step for most consequent image analysis tasks. Although the original FCM algorithm yields good results for segmenting noise free images, it fails to segment images corrupted by noise, outliers and other imaging artifact. This paper presents an image segmentation approach using Modified Fuzzy C-Means (FCM) algorithm and Fuzzy Possibilistic c-means algorithm (FPCM). This approach is a generalized version of standard Fuzzy CMeans Clustering (FCM) ...

  15. Overshoot during phenotypic switching of cancer cell populations

    E-Print Network [OSTI]

    Sellerio, Alessandro L; Ben-Moshe, Noa Bossel; Coco, Stefania; Piccinini, Andrea; Myers, Christopher R; Sethna, James P; Giampietro, Costanza; Zapperi, Stefano; La Porta, Caterina A M

    2015-01-01

    The dynamics of tumor cell populations is hotly debated: do populations derive hierarchically from a subpopulation of cancer stem cells (CSCs), or are stochastic transitions that mutate differentiated cancer cells to CSCs important? Here we argue that regulation must also be important. We sort human melanoma cells using three distinct cancer stem cell (CSC) markers - CXCR6, CD271 and ABCG2 - and observe that the fraction of non-CSC-marked cells first overshoots to a higher level and then returns to the level of unsorted cells. This clearly indicates that the CSC population is homeostatically regulated. Combining experimental measurements with theoretical modeling and numerical simulations, we show that the population dynamics of cancer cells is associated with a complex miRNA network regulating the Wnt and PI3K pathways. Hence phenotypic switching is not stochastic, but is tightly regulated by the balance between positive and negative cells in the population. Reducing the fraction of CSCs below a threshold tr...

  16. Broad scale agreement between intertidal habitats and adaptive traits on a basis of contrasting population genetic structure

    E-Print Network [OSTI]

    Borges, Rita

    stress. In southwest England (SW UK) and northern Iberia (N. Iberia), populations living in estuaries estuarine location. In contrast, SW UK samples clustered according to habitat and formed three distinct

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

    DOE Patents [OSTI]

    Prasad, Lakshman; Swaminarayan, Sriram

    2013-04-23

    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.

  18. Classifying and Segmenting Microscopy Images Using Convolutional Multiple Instance Learning

    E-Print Network [OSTI]

    Oren Z. Kraus; Lei Jimmy Ba; Brendan Frey

    2015-11-17

    Convolutional neural networks (CNN) have achieved state of the art performance on both classification and segmentation tasks. Applying CNNs to microscopy images is challenging due to the lack of datasets labeled at the single cell level. We extend the application of CNNs to microscopy image classification and segmentation using multiple instance learning (MIL). We present the adaptive Noisy-AND MIL pooling function, a new MIL operator that is robust to outliers. Combining CNNs with MIL enables training CNNs using full resolution microscopy images with global labels. We base our approach on the similarity between the aggregation function used in MIL and pooling layers used in CNNs. We show that training MIL CNNs end-to-end outperforms several previous methods on both mammalian and yeast microscopy images without requiring any segmentation steps.

  19. Understanding Segmental Dynamics in Polymer Electrolytes: A Computer Study

    E-Print Network [OSTI]

    Arijit Maitra; Andreas Heuer

    2008-04-14

    We study the segmental dynamics of poly(ethylene oxide) (PEO) from microscopic simulations in the neat polymer and a polymer electrolyte (PEO/LiBF$_4$) by analyzing the normal modes. We verify the applicability of the Rouse theory, specifically for the polymer electrolyte where dynamic heterogeneities, arising from cation-polymer interactions, alter the mobility non-uniformly along the chains. We find that the Rouse modes for both the systems are orthogonal despite the presence of non-exponential relaxation of the modes and violation of the Gaussian self-similarity of the chains. The slowdown of the segmental dynamics in the polymer electrolyte is rationalised by an order of magnitude increase in the friction coefficient for those monomers which are bound by cations. In general, for the electrolyte the Rouse predictions for the dynamics of segments (both free and/or bound) agree well except for very short times.

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

    E-Print Network [OSTI]

    Brown, Philippa

    2008-06-27

    The ‘Social Brain Hypothesis’ suggests that selection for the expansion of the neocortex in primate species is thought to originate from the cognitive demands posed by social living. Research into primates, has shown ...

  1. Defined populations of inner ear progenitor cells show limited and distinct capacities for differentiation into hair cells, neurons, and glia

    E-Print Network [OSTI]

    McLean, Will (Will James)

    2014-01-01

    Despite the fact that mammalian hair cells and neurons do not naturally regenerate in vivo, progenitor cells exist within the postnatal inner ear that can be manipulated to generate hair cells and neurons. This work reveals ...

  2. Modeling of current characteristics of segmented Langmuir probe on DEMETER

    SciTech Connect (OSTI)

    Imtiaz, Nadia; Marchand, Richard [Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1 (Canada)] [Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1 (Canada); Lebreton, Jean-Pierre [Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), CNRS-Université d'Orléans, Orléans Cedex (France)] [Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), CNRS-Université d'Orléans, Orléans Cedex (France)

    2013-05-15

    We model the current characteristics of the DEMETER Segmented Langmuir probe (SLP). The probe is used to measure electron density and temperature in the ionosphere at an altitude of approximately 700 km. It is also used to measure the plasma flow velocity in the satellite frame of reference. The probe is partitioned into seven collectors: six electrically insulated spherical segments and a guard electrode (the rest of the sphere and the small post). Comparisons are made between the predictions of the model and DEMETER measurements for actual ionospheric plasma conditions encountered along the satellite orbit. Segment characteristics are computed numerically with PTetra, a three-dimensional particle in cell simulation code. In PTetra, space is discretized with an unstructured tetrahedral mesh, thus, enabling a good representation of the probe geometry. The model also accounts for several physical effects of importance in the interaction of spacecraft with the space environment. These include satellite charging, photoelectron, and secondary electron emissions. The model is electrostatic, but it accounts for the presence of a uniform background magnetic field. PTetra simulation results show different characteristics for the different probe segments. The current collected by each segment depends on its orientation with respect to the ram direction, the plasma composition, the magnitude, and the orientation of the magnetic field. It is observed that the presence of light H{sup +} ions leads to a significant increase in the ion current branch of the I-V curves of the negatively polarized SLP. The effect of the magnetic field is demonstrated by varying its magnitude and direction with respect to the reference magnetic field. It is found that the magnetic field appreciably affects the electron current branch of the I-V curves of certain segments on the SLP, whereas the ion current branch remains almost unaffected. PTetra simulations are validated by comparing the computed characteristics and their angular anisotropy with the DEMETER measurements, as simulation results are found to be in good agreement with the measurements.

  3. Documented Safety Analysis for the B695 Segment

    SciTech Connect (OSTI)

    Laycak, D

    2008-09-11

    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.

  4. Distinct magnetic signatures of fractional vortex configurations in multiband superconductors

    SciTech Connect (OSTI)

    Silva, R. M. da; Domínguez, D.; Aguiar, J. Albino

    2014-12-08

    Vortices carrying fractions of a flux quantum are predicted to exist in multiband superconductors, where vortex core can split between multiple band-specific components of the superconducting condensate. Using the two-component Ginzburg-Landau model, we examine such vortex configurations in a two-band superconducting slab in parallel magnetic field. The fractional vortices appear due to the band-selective vortex penetration caused by different thresholds for vortex entry within each band-condensate, and stabilize near the edges of the sample. We show that the resulting fractional vortex configurations leave distinct fingerprints in the static measurements of the magnetization, as well as in ac dynamic measurements of the magnetic susceptibility, both of which can be readily used for the detection of these fascinating vortex states in several existing multiband superconductors.

  5. Internal Josephson oscillations for distinct momenta Bose-Einstein condensates

    SciTech Connect (OSTI)

    Lim, Lih-King [Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht (Netherlands); Laboratoire de Physique des Solides, CNRS UMR 8502, Universite Paris-Sud, F-91405 Orsay Cedex (France); Troppenz, T.; Morais Smith, C. [Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht (Netherlands)

    2011-11-15

    The internal Josephson oscillations between an atomic Bose-Einstein condensate (BEC) and a molecular one are studied for atoms in a square optical lattice subjected to a staggered gauge field. The system is described by a Bose-Hubbard model with complex and anisotropic hopping parameters that are different for each species, i.e., atoms and molecules. When the flux per plaquette for each species is small, the system oscillates between two conventional zero-momentum condensates. However, there is a regime of parameters in which Josephson oscillations between a vortex-carrying atomic condensate (finite momentum BEC) and a conventional zero-momentum molecular condensate may be realized. The experimental observation of the oscillations between these qualitatively distinct BEC's is possible with state-of-the-art Ramsey interference techniques.

  6. Hierarchical Partial Matching and Segmentation of Interacting Cells

    E-Print Network [OSTI]

    Wu, Zheng

    Hierarchical Partial Matching and Segmentation of Interacting Cells Zheng Wu1 , Danna Gurari1 propose a method that automatically tracks and seg- ments living cells in phase-contrast image sequences, especially for cells that deform and interact with each other or clutter. We formulate the problem as a many

  7. Football Video Segmentation Based on Video Production Strategy

    E-Print Network [OSTI]

    Jose, Joemon M.

    . Ekin et al[12] categorized them into cin- ematic and object-based ones. Cinematic algorithms utilize. Xu and Lei et al[6] proposed the cinematic feature `dominant colour ratio' to segment video cinematic and object-based features. It includes low-level football video processing algorithms

  8. SPATIOTEMPORAL SEGMENTATION FOR VALIDATION OF ROLLING LEUKOCYTE TRACKING DATA

    E-Print Network [OSTI]

    Acton, Scott

    leukocytes (activated white blood cells moving significantly slower than the blood flow) is a critical tool by employing an edge-response filter followed by an active contour method. The proposed direction sensitive such values within a range of orientations of the line segment. Our validation experiments show

  9. Behavior of fullscale concrete segmented pipelines under permanent ground displacements

    E-Print Network [OSTI]

    Michalowski, Radoslaw L.

    Behavior of fullscale concrete segmented pipelines under permanent ground displacements Junhee, Indiana; d Department of Civil Engineering, Merrimack College, MA ABSTRACT Concrete pipelines are one pipelines and eventually lead to joint failures. In order to understand and model the typical failure

  10. 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

  11. 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

  12. Method of making segmented pyrolytic graphite sputtering targets

    DOE Patents [OSTI]

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

    1994-02-08

    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.

  13. Decreasing transmembrane segment length greatly decreases perfringolysin O pore size

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

    Lin, Qingqing; Li, Huilin; Wang, Tong; London, Erwin

    2015-04-08

    Perfringolysin O (PFO) is a transmembrane (TM) ?-barrel protein that inserts into mammalian cell membranes. Once inserted into membranes, PFO assembles into pore-forming oligomers containing 30–50 PFO monomers. These form a pore of up to 300 Å, far exceeding the size of most other proteinaceous pores. In this study, we found that altering PFO TM segment length can alter the size of PFO pores. A PFO mutant with lengthened TM segments oligomerized to a similar extent as wild-type PFO, and exhibited pore-forming activity and a pore size very similar to wild-type PFO as measured by electron microscopy and a leakagemore »assay. In contrast, PFO with shortened TM segments exhibited a large reduction in pore-forming activity and pore size. This suggests that the interaction between TM segments can greatly affect the size of pores formed by TM ?-barrel proteins. PFO may be a promising candidate for engineering pore size for various applications.« less

  14. 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

  15. 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

  16. Good Features for Reliable Registration in Multi-Atlas Segmentation

    E-Print Network [OSTI]

    Lunds Universitet

    . In this paper, a pipeline for the segmentation of whole-body CT images into 20 different organs is presented, but may risk failing due to many outlier correspondences between the images. Our approach is an adapted the risk of establishing incorrect point-to-point correspondences between the images by identifying

  17. Method of making segmented pyrolytic graphite sputtering targets

    DOE Patents [OSTI]

    McKernan, Mark A. (Livermore, CA); Alford, Craig S. (Tracy, CA); Makowiecki, Daniel M. (Livermore, CA); Chen, Chih-Wen (Livermore, CA)

    1994-01-01

    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.

  18. Exploring big data opportunities for Online Customer Segmentation

    E-Print Network [OSTI]

    Utrecht, Universiteit

    Exploring big data opportunities for Online Customer Segmentation Georgia Fotaki Marco Spruit Sjaak University P.O. Box 80.089 3508 TB Utrecht The Netherlands #12;iii Exploring big data opportunities and analyzing the huge amount of data; and this is where the concept of "Big Data" can play an essential role

  19. Actin Filament Segmentation using Spatiotemporal Active-Surface and

    E-Print Network [OSTI]

    Huang, Xiaolei

    Actin Filament Segmentation using Spatiotemporal Active-Surface and Active-Contour Models Hongsheng a novel algorithm for actin filament segmen- tation in a 2D TIRFM image sequence. We treat the 2D time of a filament on all slices simultaneously. In order to locate the two ends of the filament on the over

  20. "Pushing pixels, segmenting the world and tracking things that move."

    E-Print Network [OSTI]

    Zhigilei, Leonid V.

    observed in vivo, segmenting neurons, finding sinkholes in remotely sensed imagery, tracking military RESEARCH DEVELOPMENTS · Developed the first automated method of detecting sinkholes using remotely sensed and monitor sinkholes, settling bridges and landslides. Proposed solutions are based on the combination of new

  1. 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

  2. COLOR SEGMENTATION BY ORDERED MERGINGS Jesus Angulo, Jean Serra

    E-Print Network [OSTI]

    Angulo,Jesús

    ´ematique - Ecole des Mines de Paris 35, rue Saint-Honor´e, 77305 Fontainebleau, France fangulo for segmenting images. The watershed lines associate a catchment basin to each mini- mum of the function [1-parametric ap- proach which is based on merging the catchment basins of the watershed image belonging to almost

  3. Compression, Segmentation, and Modeling of Filamentary Volumetric Data

    E-Print Network [OSTI]

    Keyser, John

    Compression, Segmentation, and Modeling of Filamentary Volumetric Data Bruce H. McCormick, Brad&M University Abstract: We present a data structure for the representation of filamentary volumetric data, it is particularly geared towards representing long, thin, branching structures that prior volumetric representations

  4. Segmentation of Video Sequences using Volumetric Image Processing

    E-Print Network [OSTI]

    de Figueiredo, Luiz Henrique

    Segmentation of Video Sequences using Volumetric Image Processing Romildo Jos'e da Silva y , Jonas. This paper introduces an algorithm to detect cuts in a video sequence. The algorithm is based on volumetric a video, a video sequence or digital video. Note that the one­parameter family f describes a volumetric

  5. Quo Vadis, Atlas-Based Segmentation? Torsten Rohlfing1

    E-Print Network [OSTI]

    Menzel, Randolf - Institut für Biologie

    ¨at Berlin, Berlin, Germany 4 Department of Neurosurgery and Computer Science Department, Stanford University in J. Suri, D. L. Wilson, and S. Laxminarayan (eds.), The Handbook of Medical Image Analysis to Atlas: Image Acquisition and Processing . . . . . . . 3 11.3 Fundamentals of Atlas-Based Segmentation

  6. Nasal codas in Standard Chinese : a study in the framework of the distinctive feature theory

    E-Print Network [OSTI]

    Mou, Xiaomin, 1977-

    2006-01-01

    Nasal codas in English and Standard Chinese (SC) are compared to distinguish between the acoustic correlates of language-universal distinctive features and language-specific enhancing attributes. The distinctive feature ...

  7. Observation of two distinct negative trions in tungsten disulfide monolayers

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

    Boulesbaa, Abdelaziz; Huang, Bing; Wang, Kai; Lin, Ming-Wei; Mahjouri-Samani, Masoud; Rouleau, Christopher M.; Xiao, Kai; Yoon, Mina; Sumpter, Bobby G.; Puretzky, Alexander A.; et al

    2015-09-25

    We report on the observation of two distinct photogenerated negative trion states TA and TB in two-dimensional tungsten disulfide (2D-WS2) monolayers. These trions are postulated to emerge from their parent excitons XA and XB, which originate from spin-orbit-split (SOS) levels in the conduction band (CB) and valence band (VB). Time-resolved spectroscopy measurements suggests that Pauli blocking controls a competition process between TA and TB photoformation, following dissociation of XA and XB through hole trapping at internal or substrate defect sites. While TA arises directly from its parent XA, TB emerges through a different transition accessible only after XB dissociates throughmore »a hole trapping channel. This discovery of additional optically-active band-edge transitions in atomically-thin metal dichalcogenides may revolutionize optoelectronic applications and fundamental research opportunities for many-body interaction physics. Ultrafast pump-probe spectroscopy of two-dimensional tungsten disulfide monolayers (2D-WS2) grown on sapphire substrates revealed two transient absorption spectral peaks that are attributed to distinct negative trions at ~2.02 eV (T1) and ~1.98 eV (T2). The dynamics measurements indicate that trion formation by the probe is enabled by photodoped electrons that remain after trapping of holes from excitons or free electron-hole pairs at defect sites in the crystal or on the substrate. Dynamics of the excitons XA and XB’s characteristic absorption bands, at ~2.03 and ~2.40 eV, respectively, were separately monitored and compared with the photoinduced absorption features. Selective excitation of the lowest exciton level XA using ?pump 1, which implies that the electron that remains from the dissociation of exciton XA is involved in the creation of this trion with a binding energy ~ 10 meV with respect to XA. The absorption peak that corresponds to trion T2 appears when ?pump > 2.4 eV, which is just sufficient to excite exciton XB. The dynamics of trion T2 formation are found to correlate with the disappearance of the bleach of XB exciton, which indicates the involvement of holes participating in the bleach dynamics of exciton XB. Static electrical-doping photoabsorption measurements confirm the presence of an induced absorption peak similar to that of T2. Since the proposed trion formation process here involves exciton dissociation through hole-trapping by defects in the 2D crystal or substrate, this discovery highlights the strong role that defects have in defining the optical and electrical properties of 2D metal chalcogenides, which is relevant to a broad spectrum of basic science and technology applications.« less

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

    E-Print Network [OSTI]

    James-Korley, LaShanda Teresa

    2005-01-01

    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 ...

  9. Probabilistic intra-retinal layer segmentation in 3-D OCT images using global shape regularization

    E-Print Network [OSTI]

    Schnörr, Christoph

    Probabilistic intra-retinal layer segmentation in 3-D OCT images using global shape regularization Processing (HCI), University of Heidelberg, Speyerer Str. 6, 69126 Heidelberg, Germany c Heidelberg 2014 Keywords: Statistical shape model Retinal layer segmentation Pathology detection Optical coherence

  10. Five groups of red giants with distinct chemical composition in the globular cluster NGC 2808

    E-Print Network [OSTI]

    Carretta, Eugenio

    2015-01-01

    The chemical composition of multiple populations in the massive globular cluster (GC) NGC~2808 is addressed with the homogeneous abundance re-analysis of 140 red giant branch (RGB) stars. UVES spectra for 31 stars and GIRAFFE spectra for the other giants were analysed with the same procedures used for about 2500 giants in 23 GCs in our FLAMES survey, deriving abundances of Fe, O, Na, Mg, Si, Ca, Ti, Sc, Cr, Mn, and Ni. Iron, elements from alpha-capture, and in the Fe-group do not show intrinsic scatter. On our UVES scale the metallicity of NGC~2808 is [Fe/H]=-1.129+/-0.005+/-0.034$ (+/-statistical +/-systematic error) with sigma=0.030 (31 stars). Main features related to proton-capture elements are retrieved, but the improved statistics and the smaller associated internal errors allow to uncover five distinct groups of stars along the Na-O anticorrelation. We observe large depletions in Mg, anticorrelated with enhancements of Na and also Si, suggestive of unusually high temperatures for proton-captures. About...

  11. THE INTEGRATON OF GRAPH-BASED KNOWLEDGE DISCOVERY WITH IMAGE SEGMENTATION HIERARCHIES FOR DATA ANALYSIS,

    E-Print Network [OSTI]

    Cook, Diane J.

    is a hybrid of hierarchical step-wise optimization (HSWO) and constrained spectral clustering that produces a hierarchical set of image segmentations. HSWO is an iterative approach to region growing segmentation in which]. HSWO produces hierarchical segmentations that are useful in many applications. However

  12. Vessel Segmentation Using A Shape Driven Flow Delphine Nain, Anthony Yezzi and Greg Turk

    E-Print Network [OSTI]

    Turk, Greg

    Vessel Segmentation Using A Shape Driven Flow Delphine Nain, Anthony Yezzi and Greg Turk Georgia. We present a segmentation method for vessels using an im- plicit deformable model with a soft shape prior. Blood vessels are chal- lenging structures to segment due to their branching and thinning geome

  13. Vessel and Intracranial Aneurysm Segmentation Using Multi-range Filters and Local Variances

    E-Print Network [OSTI]

    Chung, Albert C. S.

    Vessel and Intracranial Aneurysm Segmentation Using Multi-range Filters and Local Variances Max W,achung}@cse.ust.hk Abstract. Segmentation of vessels and brain aneurysms on non-invasive and flow-sensitive phase contrast and local variances to perform segmentation of vessels and intracranial aneurysms on PCMRA images

  14. Segmentation of retinal vessels with a hysteresis binary-classification paradigm

    E-Print Network [OSTI]

    Lübeck, Universität zu

    Segmentation of retinal vessels with a hysteresis binary-classification paradigm Alexandru P Building 64 D-23562 Luebeck, Germany Abstract Vessel segmentation in photographies of the retina is needed a paradigm of hysteresis- classifier design that we apply to the problem of vessel segmentation. Before

  15. 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

  16. USER-ASSISTED OBJECT DETECTION BY SEGMENT BASED SIMILARITY MEASURES IN MOBILE LASER SCANNER DATA

    E-Print Network [OSTI]

    USER-ASSISTED OBJECT DETECTION BY SEGMENT BASED SIMILARITY MEASURES IN MOBILE LASER SCANNER DATA S WORDS: Segmentation, Object Detection, Semi-Automatic, Mobile Mapping Systems, Segment based in fields related to urban safety analyses and/or asset management. Many MMS systems carry video cameras

  17. Web Page Segmentation with Structured Prediction and its Application in Web Page Classification

    E-Print Network [OSTI]

    Murphy, Robert F.

    Web Page Segmentation with Structured Prediction and its Application in Web Page Classification perform Web page seg- mentation with a structured prediction approach. It formu- lates the segmentation task as a structured labeling prob- lem on a transformed Web page segmentation graph (WPS- graph). WPS

  18. 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

  19. Motion Segmentation Using a K-nearest-Neighbor-Based Fusion Procedure

    E-Print Network [OSTI]

    Mignotte, Max

    Motion Segmentation Using a K-nearest-Neighbor-Based Fusion Procedure of Spatial and Temporal Label present an orig- inal motion segmentation technique using a K-nearest-neighbor-based fusion of spatial and temporal label cues. Our fusion model takes as input a spatial segmentation of a still image

  20. IMPROVING WORD SEGMENTATION FOR THAI SPEECH TRANSLATION Paisarn Charoenpornsawat and Tanja Schultz

    E-Print Network [OSTI]

    Schultz, Tanja

    IMPROVING WORD SEGMENTATION FOR THAI SPEECH TRANSLATION Paisarn Charoenpornsawat and Tanja Schultz, Japanese, or Thai which provide no word segmentation, i.e. the text has no word boundary delimiter. For Thai word segmentation, Maximal Matching, a lexicon-based approach, is one of the popular methods

  1. ECEM/EAML 2004 Segmentation of paleoecological spatio-temporal count data

    E-Print Network [OSTI]

    Toivonen, Hannu

    ECEM/EAML 2004 Segmentation of paleoecological spatio-temporal count data Kari Vasko1 , Hannu will consider applications of segmentation analysis towards analysis of paleoecological spatio-temporal time framework for the spatio-temporal segmentation problems that occurs in paleoecology and discuss

  2. 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

  3. 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

  4. Remote sensing image segmentation by active queries Devis Tuia a,n

    E-Print Network [OSTI]

    Camps-Valls, Gustavo

    Remote sensing image segmentation by active queries Devis Tuia a,n , Jordi Mun~oz-Mari´ b , Gustavo Multiscale image segmentation Remote sensing Hyperspectral imagery Multispectral imagery a b s t r a c- istics in a compact way. For remote sensing image segmentation, the selected samples are the most

  5. Computational Biology and Chemistry 30 (2006) 241248 Unraveling the nature of the segmentation clock: Intrinsic

    E-Print Network [OSTI]

    Radivojac, Predrag

    2006-01-01

    which gives rise to the body plan. In vertebrates, segmentation is most obvious in the vertebral column, USA Received 17 April 2006; accepted 24 April 2006 Abstract Vertebrate segmentation has been proved. Introduction The mechanisms orchestrating vertebrate segmentation have been the object of study for many

  6. Lithium-drifted silicon detector with segmented contacts

    DOE Patents [OSTI]

    Tindall, Craig S.; Luke, Paul N.

    2006-06-13

    A method and apparatus for creating both segmented and unsegmented radiation detectors which can operate at room temperature. The devices include a metal contact layer, and an n-type blocking contact formed from a thin layer of amorphous semiconductor. In one embodiment the material beneath the n-type contact is n-type material, such as lithium compensated silicon that forms the active region of the device. The active layer has been compensated to a degree at which the device may be fully depleted at low bias voltages. A p-type blocking contact layer, or a p-type donor material can be formed beneath a second metal contact layer to complete the device structure. When the contacts to the device are segmented, the device is capable of position sensitive detection and spectroscopy of ionizing radiation, such as photons, electrons, and ions.

  7. Mask-assisted seeded growth of segmented metallic heteronanostructures

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

    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)

    2014-12-04

    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.

  8. Mask-assisted seeded growth of segmented metallic heteronanostructures

    SciTech Connect (OSTI)

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

    2014-11-24

    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.

  9. 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

    2007-11-14

    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.

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

    DOE Patents [OSTI]

    Leuer, J.A.

    1990-05-01

    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.

  11. 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

    2014-12-04

    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

  12. Mask-Assisted Seeded Growth of Segmented Metallic Heteronanostructures

    SciTech Connect (OSTI)

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

    2014-12-04

    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.

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

    DOE Patents [OSTI]

    Leuer, James A. (Encinitas, CA)

    1990-05-01

    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.

  14. Dual-circuit segmented rail phased induction motor

    DOE Patents [OSTI]

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

    2002-01-01

    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.

  15. Automated matching and segmentation of lymphoma on serial CT examinations

    SciTech Connect (OSTI)

    Yan Jiayong; Zhao Binsheng; Curran, Sean; Zelenetz, Andrew; Schwartz, Lawrence H.

    2007-01-15

    In patients with lymphoma, identification and quantification of the tumor extent on serial CT examinations is critical for assessing tumor response to therapy. In this paper, we present a computer method to automatically match and segment lymphomas in follow-up CT images. The method requires that target lymph nodes in baseline CT images be known. A fast, approximate alignment technique along the x, y, and axial directions is developed to provide a good initial condition for the subsequent fast free form deformation (FFD) registration of the baseline and the follow-up images. As a result of the registration, the deformed lymph node contours from the baseline images are used to automatically determine internal and external markers for the marker-controlled watershed segmentation performed in the follow-up images. We applied this automated registration and segmentation method retrospectively to 29 lymph nodes in 9 lymphoma patients treated in a clinical trial at our cancer center. A radiologist independently delineated all lymph nodes on all slices in the follow-up images and his manual contours served as the ''gold standard'' for evaluation of the method. Preliminary results showed that 26/29 (89.7%) lymph nodes were correctly matched; i.e., there was a geometrical overlap between the deformed lymph node from the baseline and its corresponding mass in the follow-up images. Of the matched 26 lymph nodes, 22 (84.6%) were successfully segmented; for these 22 lymph nodes, several metrics were calculated to quantify the method's performance. Among them, the average distance and the Hausdorff distance between the contours generated by the computer and those generated by the radiologist were 0.9 mm (stdev. 0.4 mm) and 3.9 mm (stdev. 2.1 mm), respectively.

  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)

    2013-01-15

    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. Principles of Population Health Science Population Health 795

    E-Print Network [OSTI]

    Sheridan, Jennifer

    1 Principles of Population Health Science Population Health 795 A course in the Program in Population Health Fall 2012 University of Wisconsin-Madison, School of Medicine and Public Health The lecture in medicine and public health, inequities in health persist. Understanding health on a population level

  18. Detection of a distinct metal-poor stellar halo in the early-type galaxy NGC 3115

    E-Print Network [OSTI]

    Peacock, Mark B; Romanowsky, Aaron J; Brodie, Jean P

    2014-01-01

    We present the resolved stellar populations in the inner and outer halo of the nearby lenticular galaxy NGC~3115. Using deep HST observations, we analyze stars two magnitudes fainter than the tip of the red giant branch (TRGB). We study three fields along the minor axis of this galaxy, 19, 37 and 54 kpc from its center -- corresponding to 7, 14, 21 effective radii (r_{e}). Even at these large galactocentric distances, all of the fields are dominated by a relatively enriched population, with the main peak in the metallicity distribution decreasing with radius from [Z/H] ~ -0.5 to -0.65. The fraction of metal-poor stars ([Z/H] < -0.95) increases from 17%, at 16-37 kpc, to 28%, at ~54 kpc. We observe a distinct low metallicity population (peaked at [Z/H] ~ -1.3 and with total mass 2*10^{10}M_{\\odot} ~ 14% of the galaxy's stellar mass) and argue that this represents the detection of an underlying low metallicity stellar halo. Such halos are generally predicted by galaxy formation theories and have been observe...

  19. Population, Consumption & the Environment

    E-Print Network [OSTI]

    Columbia University

    consumes the 77 trillion barrels of oil energy equivalent per year ­ Fossil fuel consumption (oil, coal12/11/2009 1 Population, Consumption & the Environment Alex de Sherbinin Center for International of carbon in 2001 · The ecological footprint, a composite measure of consumption measured in hectares

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

    E-Print Network [OSTI]

    Durt, Christoph

    2012-01-01

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

  1. The impacts of population change on carbon emissions in China during 1978-2008

    SciTech Connect (OSTI)

    Zhu Qin, E-mail: zhuqin@fudan.edu.cn; Peng Xizhe, E-mail: xzpeng@fudan.edu.cn

    2012-09-15

    This study examines the impacts of population size, population structure, and consumption level on carbon emissions in China from 1978 to 2008. To this end, we expanded the stochastic impacts by regression on population, affluence, and technology model and used the ridge regression method, which overcomes the negative influences of multicollinearity among independent variables under acceptable bias. Results reveal that changes in consumption level and population structure were the major impact factors, not changes in population size. Consumption level and carbon emissions were highly correlated. In terms of population structure, urbanization, population age, and household size had distinct effects on carbon emissions. Urbanization increased carbon emissions, while the effect of age acted primarily through the expansion of the labor force and consequent overall economic growth. Shrinking household size increased residential consumption, resulting in higher carbon emissions. Households, rather than individuals, are a more reasonable explanation for the demographic impact on carbon emissions. Potential social policies for low carbon development are also discussed. - Highlights: Black-Right-Pointing-Pointer We examine the impacts of population change on carbon emissions in China. Black-Right-Pointing-Pointer We expand the STIRPAT model by containing population structure factors in the model. Black-Right-Pointing-Pointer The population structure includes age structure, urbanization level, and household size. Black-Right-Pointing-Pointer The ridge regression method is used to estimate the model with multicollinearity. Black-Right-Pointing-Pointer The population structure plays a more important role compared with the population size.

  2. Image segmentation and analysis via multiscale gradient watershed hierarchies

    E-Print Network [OSTI]

    Gauch, John M.

    1999-01-01

    . 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. Control of multiple excited image states around segmented carbon nanotubes

    E-Print Network [OSTI]

    Knörzer, J; Sadeghpour, H R; Schmelcher, P

    2015-01-01

    Electronic image states around segmented carbon nanotubes can be confined and shaped along the nanotube axis by engineering the image potential. We show how several such image states can be prepared simultaneously along the same nanotube. The inter-electronic distance can be controlled a priori by engineering tubes of specific geometries. High sensitivity to external electric and magnetic fields can be exploited to manipulate these states and their mutual long-range interactions. These building blocks provide access to a new kind of tailored interacting quantum systems.

  4. LOGISTIC POPULATION MODEL In the logistic population model ...

    E-Print Network [OSTI]

    2015-08-26

    In the logistic population model, the population growth rate obeys. dP dt. = r(1 ?. P c. )P, P(0) = P0. To solve this equation, we proceed as follow. dP dt. = r(1 ?. P.

  5. Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities and ecosystems

    E-Print Network [OSTI]

    Cushman, J. Hall

    Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities the landscape? Location: Coastal hind-dune system, Bodega Head, northern California. Methods: In each of 4 years dune. At landscape level, the two shrubs ­ and their distinctive vegetation and soils ­ frequently had

  6. Principles of Population Health Science Population Health 795

    E-Print Network [OSTI]

    Sheridan, Jennifer

    1 Principles of Population Health Science Population Health 795 A course in the Program in Population Health Fall 2011 University of Wisconsin-Madison, School of Medicine and Public Health OVERVIEW Despite significant advances in medicine and public health, inequities in health persist. Understanding

  7. Production of arrays of chemically distinct nanolitre plugs via repeated splitting in microfluidic devices{

    E-Print Network [OSTI]

    Ismagilov, Rustem F.

    Production of arrays of chemically distinct nanolitre plugs via repeated splitting in microfluidic with distinct chemical compositions. One of the primary constraints on the use of plug-based microfluidics on the nanolitre scale. Here, using microfluidic devices with several T-junctions linked in series, a single input

  8. RAPID COMMUNICATION Activation of Distinct Motor Cortex Regions During Ipsilateral and

    E-Print Network [OSTI]

    Schaechter, Judith D.

    RAPID COMMUNICATION Activation of Distinct Motor Cortex Regions During Ipsilateral, Judith D. Schaechter, complex motor tasks (Rao et al. 1993; Salmelin et al. 1995), George Bush, and Bruce R. Rosen. Activation of distinct motor in the generation of increased levels of force (Dettmers et

  9. Aesthetic preferences for architecture do not rely on commonly shared semantic distinctions

    E-Print Network [OSTI]

    Vessel, Edward A.

    Aesthetic preferences for architecture do not rely on commonly shared semantic distinctions judgments of architecture? · Visual preferences for unfamiliar real-world scenes show a high degree differentiate images of unfamiliar architecture beyond a small range of basic-level distinctions, e.g. office

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

    E-Print Network [OSTI]

    Maryland at College Park, University of

    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

  11. Microstructure and thermomechanical properties relationship of segmented thermoplastic polyurethane (TPU)

    SciTech Connect (OSTI)

    Frick, Achim, E-mail: achim.frick@htw-aalen.de; Borm, Michael, E-mail: achim.frick@htw-aalen.de; Kaoud, Nouran, E-mail: achim.frick@htw-aalen.de; Kolodziej, Jan, E-mail: achim.frick@htw-aalen.de; Neudeck, Jens, E-mail: achim.frick@htw-aalen.de [Institute of Polymer Science and Processing (iPSP), HTW Aalen (Germany)

    2014-05-15

    Thermoplastic polyurethanes (TPU) are important polymeric materials for seals. In competition with Acrylonitrile butadiene rubbers (NBR), TPU exhibits higher strength and a considerable better abrasion resistance. The advantage of NBR over TPU is a smaller compression set but however TPU excels in its much shorter processing cycle times. Generally a TPU is a block copolymer composed of hard and soft segments, which plays an important role in determining the material properties. TPU can be processed either to ready moulded parts or can be incorporated by multi component moulding, in both cases it shows decent mechanical properties. In the present work, the relationship between melt-process induced TPU morphology and resultant thermo mechanical properties were examined and determined by means of quasi-static tensile test, creep experiment, tension test and dynamical mechanical analysis (DMA). Scanning electron beam microscope (SEM) and differential scanning calorimeter (DSC) were used to study the morphology of the samples. A significant mathematical description of the stress-strain behaviour of TPU was found using a 3 term approach. Moreover it became evident that processing conditions such as processing temperature have crucial influence on morphology as well as short and long-term performance. To be more precise, samples processed at higher temperatures showed a lack of large hard segment agglomerates, a smaller strength for strains up to 250% and higher creep compliance.

  12. Population Density by County, 2000

    SciTech Connect (OSTI)

    None

    2009-01-18

    Map showing a United States profile including race, population by sex and age, housing tenure, and more.

  13. Fabrication and Performance Tests of a Segmented P-Type HPGe Detector

    E-Print Network [OSTI]

    George S. King III; Frank T. Avignone III; Christopher E. Cox; Todd W. Hossbach; Wayne Jennings; James H. Reeves

    2007-05-31

    A p-type HPGe detector has been segmented by cutting, with a diamond saw, and etching six circumferential grooves through the Li-diffused dead layer. The degree of segmentation was tested with the 88 keV gamma rays from a well-collimated source of 109Cd. The fraction of events, recognized as occurring in more than one segment, and rejected from the energy interval 2038 +/- 5 keV, was measured as 0.59.

  14. POPULATION III HYPERNOVAE

    SciTech Connect (OSTI)

    Smidt, Joseph; Whalen, Daniel J. [T-2, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Wiggins, Brandon K. [Department of Physics and Astronomy, Brigham Young University, Provo, UT 84602 (United States); Even, Wesley; Fryer, Chris L. [CCS-2, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Johnson, Jarrett L., E-mail: dwhalen1999@gmail.com [XTD-PRI, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

    2014-12-20

    Population III supernovae have been of growing interest of late for their potential to directly probe the properties of the first stars, particularly the most energetic events that are visible near the edge of the observable universe. Until now, hypernovae, the unusually energetic Type Ib/c supernovae that are sometimes associated with gamma-ray bursts, have been overlooked as cosmic beacons at the highest redshifts. In this, the latest of a series of studies on Population III supernovae, we present numerical simulations of 25-50 M {sub ?} hypernovae and their light curves done with the Los Alamos RAGE and SPECTRUM codes. We find that they will be visible at z = 10-15 to the James Webb Space Telescope and z = 4-5 to the Wide-Field Infrared Survey Telescope, tracing star formation rates in the first galaxies and at the end of cosmological reionization. If, however, the hypernova crashes into a dense shell ejected by its progenitor, it is expected that a superluminous event will occur that may be seen at z ? 20 in the first generation of stars.

  15. Detection and Segmentation of Pathological Structures by the Extended Graph-Shifts Algorithm

    E-Print Network [OSTI]

    Jason J. Corso; Alan Yuille; Nancy L. Sicotte; Arthur Toga

    2011-01-01

    Approach Applied to Multiple Sclerosis Analysis. In: Proc.Segmen- tation of Multiple Sclerosis Lesions by ModelSegmentation of Multiple Sclerosis Lesions in Multi-Sequence

  16. Automated Bayesian Segmentation of Microvascular White-Matter Lesions in the ACCORD-MIND Study

    E-Print Network [OSTI]

    Herskovits, E; Bryan, R; Yang, F

    2008-01-01

    MA, Grossman RI. Multiple sclerosis lesion quantificationsegmentation of multiple sclerosis lesions in brain MRI.3-D segmentation of multiple sclerosis lesions in magnetic

  17. Detection and Segmentation of Pathological Structures by the Extended Graph-Shifts Algorithm

    E-Print Network [OSTI]

    Corso, Jason J.; Yuille, Alan; Sicotte, Nancy L.; Toga, Arthur

    2007-01-01

    Approach Applied to Multiple Sclerosis Analysis. In: Proc.Segmen- tation of Multiple Sclerosis Lesions by ModelSegmentation of Multiple Sclerosis Lesions in Multi-Sequence

  18. Energetic neutral atoms measured by the interstellar boundary explorer (IBEX): Evidence for multiple heliosheath populations

    SciTech Connect (OSTI)

    Desai, M. I.; Allegrini, F. A.; Dayeh, M. A.; Fuselier, S. A.; McComas, D. J.; Bzowski, M.; Kubiak, M. A.; Sokó?, J. M.; Funsten, H.; Heerikhuisen, J.; Pogorelov, N. V.; Zank, G. P.; Zirnstein, E. J.; Schwadron, N. A.

    2014-01-01

    Energetic neutral atoms (ENAs) observed by the Interstellar Boundary Explorer (IBEX) provide powerful diagnostics about the origin of the progenitor ion populations and the physical mechanisms responsible for their production. In this paper, we extend the work of Desai et al. and Fuselier et al. and combine and compare ENA spectra from the first 3 yr of observations by the IBEX-Hi and -Lo ENA imagers along the lines-of-sight (LOSs) from the inner heliosphere through to the locations of Voyager 1 and 2 with results from an updated physics-based model of the three-dimensional heliosphere and its constituent ion populations. Our results show that (1) IBEX ENA fluxes and spectra above ?0.7 keV measured along the LOSs of the Voyagers are consistent with several models in which the parent pickup ion (PUI) populations originate in the inner heliosheath, and (2) a significant fraction of lower energy ENAs between ?0.1-0.5 keV may originate from interstellar neutral gas charge-exchanging with a non-thermalized (hot) population of PUIs in the outer heliosheath beyond the heliopause. We discuss the implications of ENAs observed by IBEX originating from distinct parent populations as well as from two distinct locations in the heliospheric interface. These results indicate that ENA spectral measurements at various energies can be used to remotely probe distinct physical processes operating in vastly different regions of the distant heliosphere.

  19. The differing magnitude distributions of the two Jupiter Trojan color populations

    SciTech Connect (OSTI)

    Wong, Ian; Brown, Michael E.; Emery, Joshua P.

    2014-12-01

    The Jupiter Trojans are a significant population of minor bodies in the middle solar system that have garnered substantial interest in recent years. Several spectroscopic studies of these objects have revealed notable bimodalities with respect to near-infrared spectra, infrared albedo, and color, which suggest the existence of two distinct groups among the Trojan population. In this paper, we analyze the magnitude distributions of these two groups, which we refer to as the red and less red color populations. By compiling spectral and photometric data from several previous works, we show that the observed bimodalities are self-consistent and categorize 221 of the 842 Trojans with absolute magnitudes in the range H<12.3 into the two color populations. We demonstrate that the magnitude distributions of the two color populations are distinct to a high confidence level (>95%) and fit them individually to a broken power law, with special attention given to evaluating and correcting for incompleteness in the Trojan catalog as well as incompleteness in our categorization of objects. A comparison of the best-fit curves shows that the faint-end power-law slopes are markedly different for the two color populations, which indicates that the red and less red Trojans likely formed in different locations. We propose a few hypotheses for the origin and evolution of the Trojan population based on the analyzed data.

  20. Turbine stator vane segment having internal cooling circuits

    DOE Patents [OSTI]

    Jones, Raymond Joseph (Oxford, MA); Burns, James Lee (Schenectady, NY); Bojappa, Parvangada Ganapathy (Simpsonville, SC); Jones, Schotsch Margaret (Greer, SC)

    2003-01-01

    A turbine stator vane includes outer and inner walls each having outer and inner chambers and a vane extending between the outer and inner walls. The vane includes first, second, third, fourth and fifth cavities for flowing a cooling medium. The cooling medium enters the outer chamber of the outer wall, flows through an impingement plate for impingement cooling of the outer band wall defining in part the hot gas path and through openings in the first, second and fourth cavities for flow radially inwardly, cooling the vane. The spent cooling medium flows into the inner wall and inner chamber for flow through an impingement plate radially outwardly to cool the inner wall. The spent cooling medium flows through the third cavity for egress from the turbine vane segment from the outer wall. The first, second or third cavities contain inserts having impingement openings for impingement cooling of the vane walls. The fifth cavity provides air cooling for the trailing edge.

  1. Graph-based interpretation of the Molecular Interstellar Medium Segmentation

    E-Print Network [OSTI]

    Colombo, Dario; Ginsburg, Adam; Duarte-Cabral, Ana; Hughes, Annie

    2015-01-01

    We present a generalization of the Giant Molecular Cloud (GMC) identification problem based on cluster analysis. The method we designed, SCIMES (Spectral Clustering for Interstellar Molecular Emission Segmentation) considers the dendrogram of emission in the broader framework of graph theory and utilizes spectral clustering to find discrete regions with similar emission properties. For Galactic molecular cloud structures, we show that the characteristic volume and/or integrated CO luminosity are useful criteria to define the clustering, yielding emission structures that closely reproduce "by-eye" identification results. SCIMES performs best on well-resolved, high-resolution data, making it complementary to other available algorithms. Using 12CO(1-0) data for the Orion-Monoceros complex, we demonstrate that SCIMES provides robust results against changes of the dendrogram-construction parameters, noise realizations and degraded resolution. By comparing SCIMES with other cloud decomposition approaches, we show t...

  2. 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)

    2013-08-20

    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.

  3. Behavioral/Systems/Cognitive Distinctive Features of Adult Ocular Dominance Plasticity

    E-Print Network [OSTI]

    Stryker, Michael

    Behavioral/Systems/Cognitive Distinctive Features of Adult Ocular Dominance Plasticity Masaaki Sato-0444 Sensoryexperienceprofoundlyshapesneuralcircuitryofjuvenilebrain.Althoughthevisualcortexofadultrodentsretainsacapacityfor plasticity in response to monocular visual deprivation, the nature of this plasticity and the neural circuit changes that accompany

  4. Abstract --Securing a Grid environment presents a distinctive set of challenges. This paper groups the activities

    E-Print Network [OSTI]

    Thompson, Mary R.

    1 Abstract -- Securing a Grid environment presents a distinctive set of challenges. This paper the security requirements of Grids more completely. Index Terms -- Grid security, authentication, authorization, trust management, secure communication, security policy I. INTRODUCTION The goal of Grid Computing

  5. 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 ...

  6. 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

  7. Segmentation of thermographic images of hands using a genetic Payel Ghosha

    E-Print Network [OSTI]

    Mitchell, Melanie

    contour (an individual) is evaluated for its fitness based on the texture of the region it encloses evaluation of the segmentation performed by all the methods. We conclude that LSGA successfully segments's Ergonomics and Work Physiology Lab where far-infrared images of hands were acquired using ThermaCAM AM40

  8. 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

  9. Segmentation of vessels using weighted local variances and an active contour model

    E-Print Network [OSTI]

    Chung, Albert C. S.

    Segmentation of vessels using weighted local variances and an active contour model W. K. Law is a challenging problem. This paper presents a novel approach to segment- ing blood vessels using weighted local variances and an ac- tive contour model. In this work, the vessel boundary orien- tation is estimated

  10. An LDA-based relative hysteresis classifier with application to segmentation of retinal vessels

    E-Print Network [OSTI]

    Lübeck, Universität zu

    An LDA-based relative hysteresis classifier with application to segmentation of retinal vessels hysteresis methods and, for the problem of retina vessel segmentation, to known dedicated methods on similar, to support medical diagnosis and for intervention planning. To this end, the retinal vessels need

  11. A Novel Gradient Induced Main Subject Segmentation Algorithm for Digital Still Cameras

    E-Print Network [OSTI]

    Evans, Brian L.

    A Novel Gradient Induced Main Subject Segmentation Algorithm for Digital Still Cameras Serene, it is often rst necessary to detect and seg- ment the main subject. We propose an detection and segmentation, an auto-focus lter rst puts the main subject in focus and takes a picture. Then, we open the shutter

  12. Unsupervised Segmentation of Ultrasound Images by Fusion of Spatio-Frequential Textural Features

    E-Print Network [OSTI]

    Mignotte, Max

    Unsupervised Segmentation of Ultrasound Images by Fusion of Spatio-Frequential Textural Features S. Keywords: Segmentation, ultrasound images, fusion of spatio-frequential, textural features 1. INTRODUCTION, in compact and well-separated clusters corresponding to each class of the image. Following this general

  13. SYSTEMATIC STUDY OF COLOR SPACES AND COMPONENTS FOR THE SEGMENTATION OF SKY/CLOUD IMAGES

    E-Print Network [OSTI]

    Winkler, Stefan

    ) is a cost-effective means to understanding cloud cover and weather patterns. The accurate segmentation the most suit- able color components for this task. Index Terms-- Remote sensing, Image segmentation, Color in weather prediction, climate modeling, solar irradiation measurement for renew- able energy generation

  14. An LED, Fiber-Optic, Gain Monitoring System for a Segmented Scintillator Array

    E-Print Network [OSTI]

    Saskatchewan, University of

    An LED, Fiber-Optic, Gain Monitoring System for a Segmented Scintillator Array B.E. Bewera , R Science Place, Saskatoon, Saskatchewan, Canada, S7N 5E2 Abstract A gain monitoring system, which uses with a segmented, liquid scintillator neutron detector array. The system is designed to track neutron detector cell

  15. Abstract --Image segmentation plays an important role in medical image processing. The aim of conventional hard

    E-Print Network [OSTI]

    two tissue types in the whole volume. In this paper, we adopted the PV model proposed by Leemput (PV) effect. Using the hard segmentation methods, the PV effect can substantially decrease-EM mixture segmentation methodology was tested by digital phantom MR and patient CT images with PV effect

  16. Selection on the Structural Stability of a Ribosomal RNA Expansion Segment in Daphnia obtusa

    E-Print Network [OSTI]

    Obbard, Darren

    , Canada The high rate of sequence divergence in nuclear ribosomal RNA (rRNA) expansion segments offersSelection on the Structural Stability of a Ribosomal RNA Expansion Segment in Daphnia obtusa Seanna polymerase chain reaction amplified and cloned a 589-nt fragment of the 18S rRNA gene containing expansion

  17. SPATIALLY-COHERENT NON-LINEAR DIMENSIONALITY REDUCTION AND SEGMENTATION OF HYPER-SPECTRAL IMAGES

    E-Print Network [OSTI]

    Minnesota, University of

    SPATIALLY-COHERENT NON-LINEAR DIMENSIONALITY REDUCTION AND SEGMENTATION OF HYPER-SPECTRAL IMAGES-Coherent Non-Linear Dimensionality Reduction and Segmentation of Hyper-Spectral Images Anish Mohan,1 Guillermo into account the non- linear nature of high dimensional hyper-spectral images, and projects onto a lower

  18. Investigation into the use of market segmentation analysis in transportation energy planning

    SciTech Connect (OSTI)

    Trombly, J.W.

    1985-01-01

    This research explores the application of market-segmentation analysis in transportation energy planning. The study builds on the concepts of market segmentation developed in the marketing literature to suggest a strategy of segmentation analysis for use in transportation planning. Results of the two statewide telephone surveys conducted in 1979 and 1980 for the New York State Department of Transportation are used as the data base for identifying target segments. Subjects in these surveys were asked to indicate which of 18 energy conservation actions had been implemented over the prior year to conserve gasoline. These responses serve as the basis for segmentation. Two alternative methods are pursued in identifying target market segments for purposes of transportation energy planning. The first approach consists of the application of conventional multivariate analysis procedures. The second method exploits the principles of latent trait or modern test theory. Results of the conventional analysis suggest that the data collected can be divided into eight segments. Results of the application of latent trait theory identify three market segments. Results of this study may be used to design future responses to energy shortages in addition to suggesting strategies to be pursued in measuring consumer response.

  19. On Closed Task of Chinese Word Segmentation: An Improved CRF Model Coupled with Character Clustering and

    E-Print Network [OSTI]

    Chu, Hao-hua

    On Closed Task of Chinese Word Segmentation: An Improved CRF Model Coupled with Character,yabt,clsung,hongjie,hsu}@iis.sinica.edu.tw Abstract This paper addresses two major prob- lems in closed task of Chinese word segmentation (CWS): tagging sentences interspersed with non-Chinese words, and long named entity (NE) identifica- tion

  20. Browsing on Small Screens: Recasting Web-Page Segmentation into an

    E-Print Network [OSTI]

    Cortes, Corinna

    Browsing on Small Screens: Recasting Web-Page Segmentation into an Efficient Machine Learning is a challenging task. One approach is to present the user with a thumbnail image of the full web page and allow separated. Here, we cast the web page segmentation problem into a machine learning framework, where we re

  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. 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

  3. Separation of Heart Wall in Echocardiograms by Supervised Image Segmentation \\Lambda

    E-Print Network [OSTI]

    Krovi, Venkat

    Separation of Heart Wall in Echocardiograms by Supervised Image Segmentation \\Lambda Shriram to extract heart walls from a sequence of two di­ mensional echocardiograms. Echocardiography is one of the most popular and safest methods of observing the heart. Segmentation of the heart wall

  4. AUTOMATED ACTIN FILAMENT SEGMENTATION, TRACKING AND TIP ELONGATION MEASUREMENTS BASED ON OPEN ACTIVE CONTOUR MODELS

    E-Print Network [OSTI]

    Huang, Xiaolei

    AUTOMATED ACTIN FILAMENT SEGMENTATION, TRACKING AND TIP ELONGATION MEASUREMENTS BASED ON OPEN use a novel open active contour model for filament segmentation and tracking, which is fast and robust against noise; and (ii) different strategies are proposed to solve the filament intersection problem

  5. Chinese and Japanese Word Segmentation Using Word-Level and Character-Level Information

    E-Print Network [OSTI]

    Chinese and Japanese Word Segmentation Using Word-Level and Character-Level Information Tetsuji and Japanese word segmentation. Word-level information is useful for analysis of known words, while character-level informa- tion is useful for analysis of unknown words, and the method utilizes both these two types

  6. 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

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

    E-Print Network [OSTI]

    Louisville, University of

    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

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

    E-Print Network [OSTI]

    Louisville, University of

    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

  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. Feature-Independent Action Spotting Without Human Localization, Segmentation or Frame-wise Tracking

    E-Print Network [OSTI]

    Foroosh, Hassan

    Feature-Independent Action Spotting Without Human Localization, Segmentation or Frame-wise Tracking Chuan Sun, Marshall Tappen, Hassan Foroosh Department of EECS, Division of Computer Science, University solution requires no human localization, segmentation, or framewise tracking. This is achieved by treating

  11. Hierarchical Segmentation of Surfaces Embedded in for Auto-Body Painting

    E-Print Network [OSTI]

    Choset, Howie

    Hierarchical Segmentation of Surfaces Embedded in R3 for Auto-Body Painting Prasad N. Atkar Aaron components. Index Terms-- segmentation, automation, coverage, trajectory planning, spray painting. I. INTRODUCTION AND PRIOR WORK Robots are widely used for spray-painting in the automotive industry. Owing

  12. 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

  13. 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

  14. Zoology 109 (2006) 5465 Differential segmental growth of the vertebral column of the rat

    E-Print Network [OSTI]

    Bergmann, Philip J.

    2006-01-01

    ZOOLOGY Zoology 109 (2006) 54­65 Differential segmental growth of the vertebral column of the rat (Rattus norvegicus) Philip J. BergmannÃ, Amanda D. Melin, Anthony P. Russell Vertebrate Morphology the development of these organisms. We investigate the segmental and regional growth of the entire vertebral

  15. A Novel 3D Segmentation of Vertebral Bones from Volumetric CT Images Using Graph Cuts

    E-Print Network [OSTI]

    Farag, Aly A.

    of the vertebral bones of spine column with a particular focus on the lumbar spine. The primary goalA Novel 3D Segmentation of Vertebral Bones from Volumetric CT Images Using Graph Cuts Melih S to the Vertebral bodies (VBs). In this paper, we present a novel and fast 3D segmentation framework of VBs

  16. Binary and ternary cluster integrals of polymer segments as determined by small angle neutron scattering

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -ku, Tokyo, Japan E. Wada, K. Kurita, H. Hiramatsu and H. Fukuro College of Science and Technology, NihonL-171 Binary and ternary cluster integrals of polymer segments as determined by small angle neutron integrals of polymer segments in these semi-dilute, poor solvent, solutions. In the present note we show

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

    E-Print Network [OSTI]

    Kreinovich, Vladik

    Optimized Sampling Frequencies for Weld Reliability Assessments of Long Pipeline Segments Cesar J that design an optimal testing strategy for long pipeline segments. I. INTRODUCTION Inspecting Pipelines buried pipelines. High­pressure corrosive substances transported within a pipeline and often severe soil

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

    E-Print Network [OSTI]

    Kreinovich, Vladik

    Optimized Sampling Frequencies for Weld Reliability Assessments of Long Pipeline Segments Cesar J that design an optimal testing strategy for long pipeline segments. I. INTRODUCTION Inspecting Pipelines buried pipelines. High-pressure corrosive substances transported within a pipeline and often severe soil

  19. USE OF IMPERFECTLY SEGMENTED NUCLEI IN THE CLASSIFICATION OF HISTOPATHOLOGY IMAGES OF BREAST CANCER

    E-Print Network [OSTI]

    California at Santa Barbara, University of

    USE OF IMPERFECTLY SEGMENTED NUCLEI IN THE CLASSIFICATION OF HISTOPATHOLOGY IMAGES OF BREAST CANCER. Index Terms-- Histopathology, medical image analysis, nuclei segmentation, breast cancer, H&E 1&E-stained histopathology imagery of breast cancer. We describe the imagery in Section 2. In Section 3 we desribe

  20. Polymerization Strategy for the Compression, Segmentation, and Modeling of Volumetric Data

    E-Print Network [OSTI]

    Polymerization Strategy for the Compression, Segmentation, and Modeling of Volumetric Data Bruce H Abstract: We present here a new data structure for the representation of volumetric data. The data structure is designed to allow for easy compression, storage, segmentation, and reconstruction of volumetric

  1. Volumetric Layer Segmentation Using a Generic Shape Constraint with Applications to Cortical Shape Analysis

    E-Print Network [OSTI]

    Duncan, James S.

    Abstract Volumetric Layer Segmentation Using a Generic Shape Constraint with Applications in this thesis for the problem of segmenting volumetric layers, a type of structure often encountered in medical of anatomical structures necessitates the use of volumetric approaches that exploit complete spatial information

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

    E-Print Network [OSTI]

    Hao, Jin-Kao

    . Keywords: Subcellular localization, amino acid position, transmem- brane segment insertion, local search. 1. If the segment of amino acids inside the channel contains the "right key", the translocon opens sideways. By sliding a window of about 19 amino acids along the sequence of a protein - the width of the ER membrane

  3. Microfluidic device and method for focusing, segmenting, and dispensing of a fluid stream

    DOE Patents [OSTI]

    Jacobson, Stephen C.; Ramsey, J. Michael

    2004-09-14

    A microfluidic device for forming and/or dispensing minute volume segments of a material is described. In accordance with one aspect of the present invention, a microfluidic device and method is provided for spatially confining the material in a focusing element. The device is also capable of segmenting the confined material into minute volume segments, and dispensing a volume segment to a waste or collection channel. The device further includes means for driving the respective streams of sample and focusing fluids through respective channels into a chamber, such that the focusing fluid streams spatially confine the sample material. The device may also include additional means for driving a minute volume segment of the spatially confined sample material into a collection channel in fluid communication with the waste reservoir.

  4. Microfluidic device and method for focusing, segmenting, and dispensing of a fluid stream

    SciTech Connect (OSTI)

    Jacobson, Stephen C [Knoxville, TN; Ramsey, J Michael [Knoxville, TN

    2008-09-09

    A microfluidic device and method for forming and dispensing minute volume segments of a material are described. In accordance with the present invention, a microfluidic device and method are provided for spatially confining the material in a focusing element. The device is also adapted for segmenting the confined material into minute volume segments, and dispensing a volume segment to a waste or collection channel. The device further includes means for driving the respective streams of sample and focusing fluids through respective channels into a chamber, such that the focusing fluid streams spatially confine the sample material. The device may also include additional means for driving a minute volume segment of the spatially confined sample material into a collection channel in fluid communication with the waste reservoir.

  5. Adaptive Breast Radiation Therapy Using Modeling of Tissue Mechanics: A Breast Tissue Segmentation Study

    SciTech Connect (OSTI)

    Juneja, Prabhjot; Harris, Emma J.; Kirby, Anna M.; Evans, Philip M.

    2012-11-01

    Purpose: To validate and compare the accuracy of breast tissue segmentation methods applied to computed tomography (CT) scans used for radiation therapy planning and to study the effect of tissue distribution on the segmentation accuracy for the purpose of developing models for use in adaptive breast radiation therapy. Methods and Materials: Twenty-four patients receiving postlumpectomy radiation therapy for breast cancer underwent CT imaging in prone and supine positions. The whole-breast clinical target volume was outlined. Clinical target volumes were segmented into fibroglandular and fatty tissue using the following algorithms: physical density thresholding; interactive thresholding; fuzzy c-means with 3 classes (FCM3) and 4 classes (FCM4); and k-means. The segmentation algorithms were evaluated in 2 stages: first, an approach based on the assumption that the breast composition should be the same in both prone and supine position; and second, comparison of segmentation with tissue outlines from 3 experts using the Dice similarity coefficient (DSC). Breast datasets were grouped into nonsparse and sparse fibroglandular tissue distributions according to expert assessment and used to assess the accuracy of the segmentation methods and the agreement between experts. Results: Prone and supine breast composition analysis showed differences between the methods. Validation against expert outlines found significant differences (P<.001) between FCM3 and FCM4. Fuzzy c-means with 3 classes generated segmentation results (mean DSC = 0.70) closest to the experts' outlines. There was good agreement (mean DSC = 0.85) among experts for breast tissue outlining. Segmentation accuracy and expert agreement was significantly higher (P<.005) in the nonsparse group than in the sparse group. Conclusions: The FCM3 gave the most accurate segmentation of breast tissues on CT data and could therefore be used in adaptive radiation therapy-based on tissue modeling. Breast tissue segmentation methods should be used with caution in patients with sparse fibroglandular tissue distribution.

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

    E-Print Network [OSTI]

    Withers, James

    2010-01-01

    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 ...

  7. Analysis of photoreceptor outer segment morphogenesis in zebrafish ift57, ift88 and ift172 intraflagellar transport mutants 

    E-Print Network [OSTI]

    Sukumaran, Sujita

    2009-05-15

    Vertebrate photoreceptors are polarized cells that consist of a specialized sensory structure termed the outer segment required for phototransduction and an inner segment that contains the cellular organelles. Proteins synthesized in the inner...

  8. 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.

    1984-01-01

    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.

  9. 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

  10. POPULATION GEOGRAPHY Instructor: Dr. Carr

    E-Print Network [OSTI]

    Lopez-Carr, David

    to Mexico's! Why? + net migration of 3 migrants/1000 vs. Mexico ­ net migration of 4/1000 #12;Why do we care: · Spatial patterns and processes · Geographers tend to study migration more than fertility and mortality: #12;HOW DOES POPULATION CHANGE? #12;Population Change = Fertility ­ Mortality +/- Migration #12;Crude

  11. Population Ecology Philip M. Dixon

    E-Print Network [OSTI]

    of populations include the mallard ducks in the Central flyway of the United States, the Daphnia laevis(t) - e(t), (2) where b(t), d(t), i(t), and e(t) are the instantaneous rates of birth, death, immigrationPopulation Ecology Philip M. Dixon Department of Statistics Iowa State University 20 December 2001

  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)

    2013-10-20

    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. Energy demand and population changes

    SciTech Connect (OSTI)

    Allen, E.L.; Edmonds, J.A.

    1980-12-01

    Since World War II, US energy demand has grown more rapidly than population, so that per capita consumption of energy was about 60% higher in 1978 than in 1947. Population growth and the expansion of per capita real incomes have led to a greater use of energy. The aging of the US population is expected to increase per capita energy consumption, despite the increase in the proportion of persons over 65, who consume less energy than employed persons. The sharp decline in the population under 18 has led to an expansion in the relative proportion of population in the prime-labor-force age groups. Employed persons are heavy users of energy. The growth of the work force and GNP is largely attributable to the growing participation of females. Another important consequence of female employment is the growth in ownership of personal automobiles. A third factor pushing up labor-force growth is the steady influx of illegal aliens.

  14. Automatic segmentation of cortical vessels in pre-and post-tumor resection laser range scan images

    E-Print Network [OSTI]

    Miga, Michael I.

    Automatic segmentation of cortical vessels in pre- and post- tumor resection laser range scan have developed a method, which permits this registration using vessels visible in the images. But, vessel segmentation required the localization of starting and ending points for each vessel segment. Here

  15. Proceedings of IEEE CVPR 1998, Pages(708-715), 1 Volumetric Layer Segmentation Using Coupled Surfaces Propagation

    E-Print Network [OSTI]

    Duncan, James S.

    Proceedings of IEEE CVPR 1998, Pages(708-715), 1 Volumetric Layer Segmentation Using Coupled of segmenting a volumetric layer of fi- nite thickness is encountered in several important ar- eas within encounter the problem of segmenting a volumetric layer of finite thickness. For example, in 3D cardiac image

  16. SpArcFiRe: Scalable automated detection of spiral galaxy arm segments

    SciTech Connect (OSTI)

    Davis, Darren R.; Hayes, Wayne B., E-mail: drdavis@uci.edu, E-mail: whayes@uci.edu [University of California, Irvine, CA 92697-3435 (United States)

    2014-08-01

    Given an approximately centered image of a spiral galaxy, we describe an entirely automated method that finds, centers, and sizes the galaxy (possibly masking nearby stars and other objects if necessary in order to isolate the galaxy itself) and then automatically extracts structural information about the spiral arms. For each arm segment found, we list the pixels in that segment, allowing image analysis on a per-arm-segment basis. We also perform a least-squares fit of a logarithmic spiral arc to the pixels in that segment, giving per-arc parameters, such as the pitch angle, arm segment length, location, etc. The algorithm takes about one minute per galaxies, and can easily be scaled using parallelism. We have run it on all ?644,000 Sloan objects that are larger than 40 pixels across and classified as 'galaxies'. We find a very good correlation between our quantitative description of a spiral structure and the qualitative description provided by Galaxy Zoo humans. Our objective, quantitative measures of structure demonstrate the difficulty in defining exactly what constitutes a spiral 'arm', leading us to prefer the term 'arm segment'. We find that pitch angle often varies significantly segment-to-segment in a single spiral galaxy, making it difficult to define the pitch angle for a single galaxy. We demonstrate how our new database of arm segments can be queried to find galaxies satisfying specific quantitative visual criteria. For example, even though our code does not explicitly find rings, a good surrogate is to look for galaxies having one long, low-pitch-angle arm—which is how our code views ring galaxies. SpArcFiRe is available at http://sparcfire.ics.uci.edu.

  17. Two distinct origins of a common BRCA1 mutation in breast-ovarian cancer families: A genetic study of 15 185delAG-mutation kindreds

    SciTech Connect (OSTI)

    Berman, D.B.; Schultz, D.C.; Godwin, A.K.

    1996-06-01

    We screened 163 women from breast-ovarian cancer-prone families, as well as 178 individuals affected with breast and/or ovarian cancer but unselected for family history, for germ-line mutations in exon 2 of BRCA1, by SSCP analysis and direct sequencing. A total of 25 mutations were detected. Thirteen of 64 Jewish Ashkenazi women and 2 non-Jewish individuals were found to possess the 185delAG mutation. Haplotype data for all 15 individuals, with markers intragenic to BRCA1, suggest that the Jewish Ashkenazi individuals share a common ancestry that is distinct from the lineage shared by the other two women. These data provide the first evidence of two distinct lines of transmission for the 185delAG mutation, only one of which has its origins in the Jewish Ashkenazi population. Our screening also uncovered 10 affected individuals with an 11-bp deletion at nucleotide 188 of BRCA1 (188del11), 4 of whom are Ashkenazi Jews. This is only the third reported mutation detected within the Jewish Ashkenazi population and may represent the second most common alteration in BRCA1 found in Ashkenazi Jews in the United States. The observed overrepresentation of specific mutations within a subgroup of the general population may eventually contribute to the development of inexpensive and routine tests for BRCA1 mutations, as well as to the elucidation of other contributory factors (e.g., diet, environment, and chemical exposures) that may play a key role in cancer initiation and development. The implications of the mutational data, as well as the role that founder effect, demographic history, and penetrance play in the resulting observed phenomena, are discussed. 32 refs., 3 figs., 2 tabs.

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

    DOE Patents [OSTI]

    Bieg, L.F.

    1993-04-20

    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.

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

    E-Print Network [OSTI]

    Chung, Maranatha

    1993-01-01

    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...

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

    E-Print Network [OSTI]

    Lockhead, S.

    1999-01-01

    , 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...

  1. 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

  2. An IR-based Evaluation Framework for Web Search Query Segmentation

    E-Print Network [OSTI]

    Ganguly, Niloy

    An IR-based Evaluation Framework for Web Search Query Segmentation Author 1 Author 1 Affiliation Author 1 Address Author 1 Email Author 2 Author 2 Affiliation Author 2 Address Author 2 Email ABSTRACT

  3. The phonetics of metrical prominence and its consequences on segmental phonology

    E-Print Network [OSTI]

    Giavazzi, Maria

    2010-01-01

    Only very few phonological processes are reported to be conditioned by stress. There are two major patterns of stress-sensitive processes: segments are lengthened under stress, and vowels become louder. Two other phonological ...

  4. SEGMENTING CROSSING FIBER GEOMETRIES USING FLUID MECHANICS TENSOR DISTRIBUTION FUNCTION TRACTOGRAPHY

    E-Print Network [OSTI]

    Thompson, Paul

    SEGMENTING CROSSING FIBER GEOMETRIES USING FLUID MECHANICS TENSOR DISTRIBUTION FUNCTION introduce a fluid mechanics based tractography method that estimates the most likely connection path between using fluid mechanics based tractography has demonstrated superior performance vs. other competing

  5. Evaluation of a system for segmental speech quality assessment: Voiceless fricavties. 

    E-Print Network [OSTI]

    Wrench, Alan; Jackson, M S; Soutar, D S; Robertson, A G; Beck, J Mackenzie

    1995-01-01

    In this paper, an automatic assessment procedure for monitoring the speech progress of patients who have undergone intra-oral surgery is evaluated. The metric is currently limited to fricative segments and is based ...

  6. Performance of transducers with segmented piezoelectric stacks using materials with high electromechanical coupling coefficient

    E-Print Network [OSTI]

    Thompson, Stephen C; Markley, Douglas C

    2013-01-01

    Underwater acoustic transducers often include a stack of thickness polarized piezoelectric material pieces of alternating polarity interspersed with electrodes, bonded together and electrically connected in parallel. The stack is normally much shorter than a quarter wavelength at the fundamental resonance frequency, so that the mechanical behavior of the transducer is not affected by the segmentation. When the transducer bandwidth is less than a half octave, as has conventionally been the case, stack segmentation has no significant effect on the mechanical behavior of the device. However, when a high coupling coefficient material such as PMN-PT is used to achieve a wider bandwidth, the difference between a segmented stack and a similar piezoelectric section with electrodes only at the two ends can be significant. This paper investigates the effects of stack segmentation on the performance of wideband underwater acoustic transducers, particularly tonpilz transducer elements. Included is discussion of transduce...

  7. 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

  8. WPP, No.111: Syllabification, Sonority, and Spoken Word Segmentation: Evidence from Word-Spotting

    E-Print Network [OSTI]

    Bishop, Jason; Toda, Kristen

    2012-01-01

    segmentation in French: Word- spotting data. Brain andH. Mitterer. 2010. Possible words and fixed stress in theAmherst. McQueen, J. 1996. Word Spotting. Language and

  9. 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

  10. 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

  11. 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

  12. 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

  13. Architectural Gear Ratio and Muscle Fiber Strain Homogeneity in Segmented Musculature

    E-Print Network [OSTI]

    Azizi, Manny

    axis of bending (vertebral column). In this study we use the relatively simple architecture homogeneity in segmented musculature. J. Exp. Zool. 307A:145­155. At the sarcomere level, all vertebrate

  14. 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 ...

  15. Confocal Microscopy and Nuclear Segmentation Algorithm for Quantitative Imaging of Epithelial Tissue 

    E-Print Network [OSTI]

    Harris, Meagan Alyssa

    2015-07-08

    for imaging epithelial tissues and an image processing algorithm for segmentation of epithelial nuclei. A rapid beam and stage scanning combination was used to acquire fluorescence confocal images of cellular and tissue features along the length of excised...

  16. Inferring population history from genealogies 

    E-Print Network [OSTI]

    Lohse, Konrad R.

    2010-01-01

    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 ...

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

    SciTech Connect (OSTI)

    Johnson, Paul E [ORNL] [ORNL

    2007-01-01

    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.

  18. 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)

    2014-05-20

    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.

  19. Effect of sorghum type on the digestibility of segmented and whole plant sorghum silages 

    E-Print Network [OSTI]

    Spiegel Richa, Rodrigo Enrique

    1975-01-01

    EFFECT OF SORGHUM TYPE ON THE DIGESTIBILITY OF SEGMENTED AND NHOLE PLANT SORGHUM SILAGES A Thesis RODRIGO E. SPIEGEL Submitted to the Grs duate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE May 1975 Major Suhject: Animal Nutri tion EFFECT OF SORGHUM TYPE ON THE DIGESTIBILITY OF SEGMENTED AND WHOLE PLANT SORGHUM SILAGES A Thesis by RODRIGO E. SPIEGEL Approved as to style and content by: ' Chairman o . Cdmmittee Member Head...

  20. Gap-Size Distribution Functions of a Random Sequential Adsorption Model of Segments on the Line

    E-Print Network [OSTI]

    N. A. M. Araujo; A. Cadilhe

    2006-04-24

    We performed extensive simulations accompanied by a detailed study of a two-segment size random sequential model on the line. We followed the kinetics towards the jamming state, but we paid particular attention to the characterization of the jamming state structure. In particular, we studied the effect of the size ratio on the mean-gap size, the gap-size dispersion, gap-size skewness, and gap-size kurtosis at the jamming state. We also analyzed the above quantities for the four possible segment-to-segment gap types. We ranged the values of the size ratio from one to twenty. In the limit of a size ratio of one, one recovers the classical car-parking problem. We observed that at low size ratios the jamming state is constituted by short streaks of small and large segments, while at high values of the size ratio the jamming state structure is formed by long streaks of small segments separated by a single large segment. This view of the jamming state structure as a function of the size ratio is supported by the various measured quantities. The present work can help provide insight, for example, on how to minimize the interparticle distance or minimize fluctuations around the mean particle-to-particle distance.

  1. BEHAVIORAL DISTINCTIONS: THE USE OF LIGHT-DUTY TRUCKS AND PASSENGER CARS

    E-Print Network [OSTI]

    Kockelman, Kara M.

    BEHAVIORAL DISTINCTIONS: THE USE OF LIGHT-DUTY TRUCKS AND PASSENGER CARS by Kara Maria Kockelman as light-duty trucks (LDTs), resulting in a variety of regulatory protections. Production and purchase as light-duty trucks (LDTs), and they currently capture 51% of new U.S. passenger vehicle sales1 ­ much

  2. Gunsch Jesse Andrew SR COE Spring 2009 Dean's List With Distinction

    E-Print Network [OSTI]

    Wong, Pak Kin

    , Anne E SR EHY Rainey, Joseph Daniel JR AEE Rheinheimer, Paul E SR CHE Richards, Robert G SR OSEGunsch Jesse Andrew SR COE Spring 2009 Dean's List With Distinction (Students enrolled at the UA Andrew JR AEE Cartee, Ryan Robert SR CHE Case, Lauren SR CVE Chu, Clayton Nguyen SR AEE Chu, Wesley

  3. Distinct large-scale turbulent-laminar states in transitional pipe flow

    E-Print Network [OSTI]

    Barkley, Dwight

    ) When fluid flows through a channel, pipe, or duct, there are two basic forms of motion: smooth laminarDistinct large-scale turbulent-laminar states in transitional pipe flow David Moxey1 and Dwight alternat- ing turbulent-laminar flow states on long length scales in subcri- tical shear flows (12

  4. Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain,

    E-Print Network [OSTI]

    Distinctive upper mantle anisotropy beneath the High Lava Plains and Eastern Snake River Plain and continuing with the still- ongoing volcanism in the High Lava Plains (HLP) and eastern Snake River Plain (SRP waves; shear wave splitting; high lava plains; Snake River Plain; Yellowstone. Index Terms: 8137

  5. Capillary pressure in a porous medium with distinct pore surface and pore volume fractal dimensions

    E-Print Network [OSTI]

    Deinert, Mark

    Capillary pressure in a porous medium with distinct pore surface and pore volume fractal dimensions been substantiated by assuming that capillary pressure is directly related to the pore radius. When capillary pressure and pore volume are directly propor- tional to the pore radius. If a system's pore space

  6. Heavy Metal Stress. Activation of Distinct Mitogen-Activated Protein Kinase Pathways

    E-Print Network [OSTI]

    Hirt, Heribert

    Heavy Metal Stress. Activation of Distinct Mitogen-Activated Protein Kinase Pathways by Copper, Vienna Biocenter, A­1030 Vienna, Austria Excessive amounts of heavy metals adversely affect plant growth and development. Whereas some regions naturally contain high levels of heavy metals, anthropogenic release

  7. Automated non-rigid registration and mosaicing for robust imaging of distinct retinal capillary

    E-Print Network [OSTI]

    Tomasi, Carlo

    Automated non-rigid registration and mosaicing for robust imaging of distinct retinal capillary.hendargo@duke.edu Abstract: Variance processing methods in Fourier domain optical coherence tomography (FD-OCT) have enabled demonstrate a method to eliminate motion artifacts in speckle variance FD-OCT images of the retinal

  8. Breast cancer subtypes express distinct receptor repertoires for tumor-associated macrophage derived cytokines

    E-Print Network [OSTI]

    Kenny, Paraic

    Breast cancer subtypes express distinct receptor repertoires for tumor-associated macrophage n f o Article history: Received 10 June 2011 Available online 25 June 2011 Keywords: Breast cancer by macrophages is associated with poor outcomes in breast cancer and other solid tumors, however the identity

  9. Precipitation Change Effects Evaluated For Seven Ecosystems With Distinctive Vegetation and Hydrology

    E-Print Network [OSTI]

    Post, Wilfred M.

    Precipitation Change Effects Evaluated For Seven Ecosystems With Distinctive Vegetation and Hydrology Contact: Paul J. Hanson hansonpj@ornl.gov 865-574-5361 Doubled Precipitation Contact: Paul JCent, ORCHIDEE, TECO), were used to explored effects of potential precipitation changes (P) on water limitation

  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)

    2014-11-01

    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. 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 ...

  12. Distinct p53 genomic binding patterns in normal and cancer-derived human cells

    SciTech Connect (OSTI)

    Botcheva K.; McCorkle S. R.; McCombie W. R.; Dunn J. J.; Anderson C. W.

    2011-12-15

    We report here genome-wide analysis of the tumor suppressor p53 binding sites in normal human cells. 743 high-confidence ChIP-seq peaks representing putative genomic binding sites were identified in normal IMR90 fibroblasts using a reference chromatin sample. More than 40% were located within 2 kb of a transcription start site (TSS), a distribution similar to that documented for individually studied, functional p53 binding sites and, to date, not observed by previous p53 genome-wide studies. Nearly half of the high-confidence binding sites in the IMR90 cells reside in CpG islands, in marked contrast to sites reported in cancer-derived cells. The distinct genomic features of the IMR90 binding sites do not reflect a distinct preference for specific sequences, since the de novo developed p53 motif based on our study is similar to those reported by genome-wide studies of cancer cells. More likely, the different chromatin landscape in normal, compared with cancer-derived cells, influences p53 binding via modulating availability of the sites. We compared the IMR90 ChIPseq peaks to the recently published IMR90 methylome1 and demonstrated that they are enriched at hypomethylated DNA. Our study represents the first genome-wide, de novo mapping of p53 binding sites in normal human cells and reveals that p53 binding sites reside in distinct genomic landscapes in normal and cancer-derived human cells.

  13. SUB-POPULATION BRAIN ATLASES

    E-Print Network [OSTI]

    Thompson, Paul

    SUB-POPULATION BRAIN ATLASES Paul Thompson PhD, Michael S. Mega MD PhD, and Arthur W. Toga PhD Laboratory of Neuro Imaging, Brain Mapping Division and Alzheimer's Disease Center Dept. of Neurology, UCLA School of Medicine, Los Angeles, CA 90095-1769 A Chapter in: Brain Mapping: The Methods (2nd Edition

  14. Population Growth February 6, 2008

    E-Print Network [OSTI]

    Mead, Jodi L.

    for all values of M and k. 3. Generate the direction fields of the logistic equation with harvesting: dy that the population of a species of fish in a certain lake is growing according to a logistic model with k = 0.3 and M intial value problem. (b) Plot the direction field and a few informative solution curves. (c) Describe

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

    Energy Savers [EERE]

    2898: Environmental Justice in Minority Populations and Low-Income Populations EO 12898: Environmental Justice in Minority Populations and Low-Income Populations To focus Federal...

  16. 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)

    2009-07-15

    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.

  17. 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.

    2014-01-21

    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.

  18. 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)

    2009-09-22

    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.

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

    SciTech Connect (OSTI)

    Cooke, Conrad; Spann, Holger

    2013-07-01

    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)

  20. 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

    1993-06-15

    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.

  1. Radio faint AGN: a tale of two populations

    E-Print Network [OSTI]

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

    2015-01-01

    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...

  2. Probabilistic vessel axis tracing and its application to vessel segmentation with stream surfaces and minimum cost paths

    E-Print Network [OSTI]

    Chung, Albert C. S.

    Probabilistic vessel axis tracing and its application to vessel segmentation with stream surfaces May 2007 Available online 2 June 2007 Abstract We propose a novel framework to segment vessels on their cross-sections. It starts with a probabilistic vessel axis tracing in a gray-scale three

  3. Chinese Word Segmentation with Minimal Linguistic Knowledge: An Improved Conditional Random Fields Coupled with Character Clustering and

    E-Print Network [OSTI]

    Chen, Sheng-Wei

    Chinese Word Segmentation with Minimal Linguistic Knowledge: An Improved Conditional Random Fields addresses three major problems of closed task Chinese word segmentation (CWS): word overlap, tagging sentences interspersed with non-Chinese words, and long named entity (NE) identification. For the first, we

  4. IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 17, NO. 12, DECEMBER 2008 2465 Detection and Segmentation of Concealed

    E-Print Network [OSTI]

    Popovic, Zoya

    by measuring the radiometric temperatures of different objects on a human sub- ject. The goal of this work, segmentation, terahertz imaging. I. INTRODUCTION AT room temperature, the peak of black body radiation. In fact, we show in our experiments that state of the art image segmentation algorithms fail

  5. MULTISPECTRAL OBJECT SEGMENTATION AND RETRIEVAL IN SURVEILLANCE C. O Conaire, N. E. O'Connor, E. Cooke, A. F. Smeaton

    E-Print Network [OSTI]

    Ó Conaire, Ciarán

    ABSTRACT This paper describes a system for object segmentation and feature extraction for surveillance video. Segmentation is per- formed by a dynamic vision system that fuses information from thermal or reviewing hours of surveillance video has stim- ulated research in computer vision techniques for visual sur

  6. A Self-Organlzing Japanese Word Segmenter using He-ristic Word Identification and Re-estimation

    E-Print Network [OSTI]

    A Self-Organlzing Japanese Word Segmenter using He-ristic Word Identification and Re a stochastic Japanese word segmenter from a small number of basic words and a large amount of unsegmented training text. It consists of a word-based statistical language model, an initial estimation procedure

  7. This thesis presents a fast multiscale stereo matching algorithm based on segmentation by weighted aggregation (SWA)[14]. The proposed frame-

    E-Print Network [OSTI]

    segmentation and stereo matching. We provide qualitative segmentation results and quantitative stereo 2008 2 #12;#12;Abstract This thesis presents a fast multiscale stereo matching algorithm of fixed-scale approaches. This thesis is a suggestion toward a new direction for the stereo problem

  8. 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

  9. 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

  10. A Perceptual Colour Segmentation Algorithm Christopher G. Healey and James T. Enns

    E-Print Network [OSTI]

    Healey, Christopher G.

    for each strong category. We evaluated our technique by segmenting known colour regions from the RGB, HSV]: User Interfaces­ ergonomics, screen design (graphics, colour); I.3.6 [Computer Graphics]: Methodology and Techniques­ ergonomics, interaction techniques General Terms: Design, Experimentation Additional Key Words

  11. Features for segmenting and classifying long-duration recordings of "personal" audio

    E-Print Network [OSTI]

    Ellis, Dan

    {dpwe,kslee}@ee.columbia.edu Abstract A digital recorder weighing ounces and able to record for more-labeled ground-truth segment boundaries. 1. Introduction The idea of using technology to aid human memory ex classifications to support context sen- sitive applications. In later work, Clarkson recorded 100 days of audio

  12. Serialized Unsupervised Classifier for Adaptative Color Image Segmentation: Application to Digitized Ancient Manuscripts.

    E-Print Network [OSTI]

    Leydier, Yann

    . The algorithm reuses information about the clusters computed by the previous classification and automatically variety of images using other features for different purposes like color image segmentation as well libraries. Most of them are manually indexed at great cost, thus the automation of this task has become

  13. 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

  14. 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

    2010-11-15

    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.

  15. An Oriented Flux Symmetry Based Active Contour Model for Three Dimensional Vessel Segmentation

    E-Print Network [OSTI]

    Chung, Albert C. S.

    into small vessels. The contour dynamics of these segmentation methods are K. Daniilidis, P. Maragos, N curvilinear structures, the intensity profiles along the structure cross-sectional plane are commonly- linear structure center, and the gradient antisymmetry with respect to the object boundary. Measuring

  16. 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

  17. LONGITUDINAL MULTIPLE SCLEROSIS LESION SEGMENTATION USING 3D CONVOLUTIONAL NEURAL NETWORKS

    E-Print Network [OSTI]

    Ramanathan, M.

    LONGITUDINAL MULTIPLE SCLEROSIS LESION SEGMENTATION USING 3D CONVOLUTIONAL NEURAL NETWORKS Suthirth with dice scores comparable to the inter-rater variability. Index Terms-- Multiple Sclerosis, 3D Convolutional Neural Networks, Deep Learning, Neuroimaging 1. INTRODUCTION Multiple Sclerosis (MS) is a chronic

  18. 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

  19. Earthquake Damage Assessment Using Objective Image Segmentation: A Case Study of 2010 Haiti Earthquake

    E-Print Network [OSTI]

    Earthquake Damage Assessment Using Objective Image Segmentation: A Case Study of 2010 Haiti Earthquake Thomas Oommen1 , Umaa Rebbapragada2 , and Daniel Cerminaro3 1 Department of Geological Engineering Haiti earthquake provided a new opportunity to analyze earthquake-induced damage. Previous work has

  20. Retinal Blood Vessels Segmentation Using the Radial Projection and Supervised Classification

    E-Print Network [OSTI]

    Cheung, Yiu-ming

    Retinal Blood Vessels Segmentation Using the Radial Projection and Supervised Classification Qinmu: ymc@comp.hkbu.edu.hk Abstract The low-contrast and narrow blood vessels in retinal images of improving detection of such vessels, we propose the ra- dial projection method to locate the vessel

  1. Vessel Segmentation and Analysis in Laboratory Skin Transplant Micro-angiograms

    E-Print Network [OSTI]

    Lübeck, Universität zu

    Vessel Segmentation and Analysis in Laboratory Skin Transplant Micro-angiograms Alexandru transplantations depends on the adequate revascularization of the trans- planted dermal matrix. To induce vessel and length of newly grown vessels have to be measured in micro-angiograms (x-ray images of the blood vessels

  2. VESSEL SEGMENTATION IN MEDICAL IMAGING USING A TIGHT-FRAME BASED ALGORITHM

    E-Print Network [OSTI]

    Chan, Raymond

    VESSEL SEGMENTATION IN MEDICAL IMAGING USING A TIGHT-FRAME BASED ALGORITHM XIAOHAO CAI, RAYMOND vessels in magnetic resonance angiography images. Our method iteratively refines a region that encloses the potential boundary of the vessels. At each iteration, we apply the tight-frame algorithm to denoise

  3. Vessel Segmentation in Angiograms using Hysteresis Thresholding Alexandru-Paul Condurache

    E-Print Network [OSTI]

    Lübeck, Universität zu

    Vessel Segmentation in Angiograms using Hysteresis Thresholding Alexandru-Paul Condurache.e. vessel imaging after the injection of a radiopaque substance) is a widely used procedure for vessel- lature it is needed to measure the angiogram area covered by vessels and/or the vessel length

  4. The Segmentation of the Supraorbital Vessels in Thermal Imagery The Department of Computer Science

    E-Print Network [OSTI]

    The Segmentation of the Supraorbital Vessels in Thermal Imagery Zhen Zhu The Department of Computer with the activation of the corrugator muscle on the forehead. The vessels that supply blood to the corrugator muscle, pro- portionally to its degree of activation, are the supraorbital vessels. The rate of blood flow

  5. Vessel Segmentation in 2D-Projection Images Using a Supervised Linear Hysteresis Classifier

    E-Print Network [OSTI]

    Lübeck, Universität zu

    Vessel Segmentation in 2D-Projection Images Using a Supervised Linear Hysteresis Classifier, Germany Abstract 2D projection imaging is a widely used procedure for vessel visualization. For the subsequent analysis of the vasculature, precise measurements of e.g. vessel area, ves- sel length

  6. Valmet: A new validation tool for assessing and improving 3D object segmentation

    E-Print Network [OSTI]

    Gerig, Guido

    Valmet: A new validation tool for assessing and improving 3D object segmentation 1,2 Guido Gerig, 1 Department of Psychiatry, UNC, Chapel Hill, NC 27599, USA Software: http://www.ia.unc.edu/public/valmet email are validity and reliability. We have developed VALMET, a new tool for validation and comparison of object

  7. On the segmentation and classification of water in videos Pascal Mettes1

    E-Print Network [OSTI]

    Veltkamp, Remco

    On the segmentation and classification of water in videos Pascal Mettes1 , Robby T. Tan1, Utrecht, the Netherlands P.S.M.Mettes@uva.nl, r.t.tan@uu.nl, R.C.Veltkamp@uu.nl Keywords: hybrid water recognition of water entails a wide range of applications, yet little attention has been paid to solve

  8. Chemical Protein Synthesis by Solid Phase Ligation of Unprotected Peptide Segments

    E-Print Network [OSTI]

    Dennis, Edward A.

    Chemical Protein Synthesis by Solid Phase Ligation of Unprotected Peptide Segments Lynne E. Canne, 1998 Abstract: In this paper we describe "solid phase chemical ligation" (SPCL), the application for the total chemical synthesis of proteins. In this method, each building block used is an unprotected peptide

  9. Experimental study on the behavior of segmented buried concrete pipelines subject to ground movements

    E-Print Network [OSTI]

    Michalowski, Radoslaw L.

    Experimental study on the behavior of segmented buried concrete pipelines subject to ground of Civil Engineering, Merrimack College, MA ABSTRACT Seismic damage to buried pipelines is mainly caused. In particular, a pipeline crossing the fault plane is subjected to significant bending, shear, and axial forces

  10. Single-cell sequencing provides clues about the host interactions of segmented filamentous bacteria (SFB)

    E-Print Network [OSTI]

    Quake, Stephen R.

    resistance has hindered characterization of these enigmatic bacteria. In the present study, we isolated five bacteria (SFB) Su¨nje J. Pamp,1 Eoghan D. Harrington,1 Stephen R. Quake,2,3,4 David A. Relman,1 94304, USA Segmented filamentous bacteria (SFB) are host-specific intestinal symbionts that comprise

  11. Jointly Aligning and Segmenting Multiple Web Photo Streams for the Inference of Collective Photo Storylines

    E-Print Network [OSTI]

    Xing, Eric P.

    Jointly Aligning and Segmenting Multiple Web Photo Streams for the Inference of Collective Photo,epxing}@cs.cmu.edu Abstract With an explosion of popularity of online photo sharing, we can trivially collect a huge number of photo streams for any interesting topics such as scuba diving as an outdoor recreational activity class

  12. A Precision-Recall Criterion Based Consensus Model For Fusing Multiple Segmentations

    E-Print Network [OSTI]

    Mignotte, Max

    of the segmentation problem. We propose also a hierarchical and efficient way to optimize the consensus energy), Universit´e de Montr´eal, Facult´e des Arts et des Sciences, Montr´eal H3C 3J7 QC, Canada (e-mail: mignotte

  13. (to appear in 1998 IEEE MIC) Joint-MAP Reconstruction/Segmentation for Transmission Tomography

    E-Print Network [OSTI]

    . In addition, the geometry of fan beam scanners for transmission tomography in SPECT with line sources can(to appear in 1998 IEEE MIC) Joint-MAP Reconstruction/Segmentation for Transmission Tomography A Bayesian method, including a pointwise prior comprising mixtures of gamma distributions, is applied

  14. 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

  15. Secondary electron emission from dielectric materials of a Hall thruster with segmented electrodes

    E-Print Network [OSTI]

    Secondary electron emission from dielectric materials of a Hall thruster with segmented electrodes parameters in Hall thrusters depend strongly on the yield of secondary electron emission from channel walls. Comparative measurements of the yield of secondary electron emission at low energies of primary electrons were

  16. 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

  17. A Fast Texture Feature Extraction Method for Region-based Image Segmentation

    E-Print Network [OSTI]

    Fritts, Jason

    A Fast Texture Feature Extraction Method for Region-based Image Segmentation Hui Zhang* , Jason E. In this paper, we propose a novel fast texture feature extraction method which takes advantage a novel fast texture feature extraction method which takes advantage of the similarities between

  18. Label Noise-Tolerant Hidden Markov Models for Segmentation: Application to ECGs

    E-Print Network [OSTI]

    Verleysen, Michel

    Label Noise-Tolerant Hidden Markov Models for Segmentation: Application to ECGs Beno^it Fr´enay, Ga classification models can ad- versely be impacted by the presence of label noise in training observa- tions by incorporating a statistical noise model within the inference algorithm. In this paper, the specific case

  19. 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

  20. 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

  1. Leading Up the Lexical Garden Path: Segmentation and Ambiguity in Spoken Word Recognition

    E-Print Network [OSTI]

    Davis, Matt

    Leading Up the Lexical Garden Path: Segmentation and Ambiguity in Spoken Word Recognition Matthew H-modal repetition priming experiments, traced the time course of recognition of words with onset embeddings (captain) and short words in contexts that match (cap tucked) or mismatch (cap looking) with longer words. Results

  2. Multi-level Ground Glass Nodule Detection and Segmentation in CT Lung Images

    E-Print Network [OSTI]

    Corso, Jason J.

    Multi-level Ground Glass Nodule Detection and Segmentation in CT Lung Images Yimo Tao1,2 , Le Lu1. Early detection of Ground Glass Nodule (GGN) in lung Computed Tomography (CT) images is important for lung cancer prog- nosis. Due to its indistinct boundaries, manual detection and segmenta- tion of GGN

  3. Implicit Active Shape Models for 3D Segmentation in MR Imaging

    E-Print Network [OSTI]

    Paragios, Nikos

    Implicit Active Shape Models for 3D Segmentation in MR Imaging Mika¨el Rousson1 , Nikos Paragios2 , and Rachid Deriche1 1 I.N.R.I.A. Sophia Antipolis, France E-mail: {Mikael of various form and complexity. Promising results on the extraction of brain ventricles in MR images

  4. Cellular Automata Segmentation of Brain Tumors on Post Contrast MR Images

    E-Print Network [OSTI]

    Yanikoglu, Berrin

    Cellular Automata Segmentation of Brain Tumors on Post Contrast MR Images Andac Hamamci1 , Gozde proposed a complete tumor segmenta- tion method on post contrast T1 MR images, which standardizes the VOI Unal1 , Nadir Kucuk2 , and Kayihan Engin2 1 Faculty of Engineering and Natural Sciences, Sabanci

  5. How Ideal Are We? Incorporating Human Limitations into Bayesian Models of Word Segmentation*

    E-Print Network [OSTI]

    Steyvers, Mark

    How Ideal Are We? Incorporating Human Limitations into Bayesian Models of Word Segmentation* Lisa, this work was supported by NSF grant BCS-0843896 to LP. #12;model (Oaksford & Chater, 1998). Rational models. In this paper, we investigate how to incorporate human limitations into the Bayesian model of GGJ. In particular

  6. 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

  7. Compression, Segmentation, and Modeling of Large-Scale Filamentary Volumetric Data

    E-Print Network [OSTI]

    Keyser, John

    Compression, Segmentation, and Modeling of Large-Scale Filamentary Volumetric Data Bruce H. Mc Department ABSTRACT We describe a method for processing large amounts of volumetric data collected from struc- tures extending over very large regions that prior volumetric rep- resentations have difficulty

  8. 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

  9. Joint production and economic retention quantity decisions in capacitated production systems serving multiple market segments 

    E-Print Network [OSTI]

    Katariya, Abhilasha Prakash

    2009-05-15

    In this research, we consider production/inventory management decisions of a rmthat sells its product in two market segments during a nite planning horizon. In thebeginning of each period, the rm makes a decision on how much to produce basedon...

  10. Automatic Lumbar Vertebra Segmentation from clinical CT for Wedge Compression Fracture Diagnosis

    E-Print Network [OSTI]

    Chaudhary, Vipin

    Automatic Lumbar Vertebra Segmentation from clinical CT for Wedge Compression Fracture Diagnosis, Williamsville, NY 14221 ABSTRACT Lumbar vertebral fractures vary greatly in types and causes and usually result from severe trauma or pathological conditions such as osteoporosis. Lumbar wedge compression fractures

  11. Segmented Waves from a Spatiotemporal Transverse Wave Instability Lingfa Yang, Igal Berenstein, and Irving R. Epstein*

    E-Print Network [OSTI]

    Epstein, Irving R.

    to an interaction between front rippling via a transverse instability and front symmetry breaking by a fast waves [6], except for a recent report of stable segmented spirals in the BZ-AOT [AOT sodium bis(2-diffusing inhibitor plays a key role, a phenomenon which has drawn much attention recently. In fast inhibitor systems

  12. INTERACTIVE SEGMENTATION OF MULTI-DIMENSIONAL MEDICAL DATA WITH CONTOUR-BASED APPLICATION OF GENETIC ALGORITHMS

    E-Print Network [OSTI]

    Poli, Riccardo

    Sciences and Technology, and Nuclear Engineering, MIT, USA $Department of Electronic Engineering in designing a non-linear edge-detector using a genetic algorithm. Finally, by applying the edge detector) that is used to design an edge de- tection/interpolation system that produce a segmented surface representation

  13. 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)

    2014-04-15

    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.

  14. Feedback between Population and Evolutionary Dynamics Determines the Fate of Social Microbial Populations

    E-Print Network [OSTI]

    Sanchez, Alvaro

    The evolutionary spread of cheater strategies can destabilize populations engaging in social cooperative behaviors, thus demonstrating that evolutionary changes can have profound implications for population dynamics. At ...

  15. Arthropod population and community dynamics in turfgrass 

    E-Print Network [OSTI]

    Wang, Yong

    1998-01-01

    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...

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

    SciTech Connect (OSTI)

    Kreitman, Paul J.; Sirianni, Steve R.; Pillard, Mark M.

    2013-07-01

    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)

  17. 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.; Reamer, Courtney B.; Mohler, Emile R.

    2014-02-15

    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.

  18. 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)

    2012-01-01

    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 ...

  19. Distinctive microstructural features of aged sodium silicate-activated slag concretes

    SciTech Connect (OSTI)

    San Nicolas, Rackel; Bernal, Susan A.; Mejía de Gutiérrez, Ruby; Deventer, Jannie S.J. van; Provis, John L.

    2014-11-15

    Electron microscopic characterisation of 7-year old alkali-activated blast-furnace slag concretes enabled the identification of distinct microstructural features, providing insight into the mechanisms by which these materials evolve over time. Backscattered electron images show the formation of Liesegang-type ring formations, suggesting that the reaction at advanced age is likely to follow an Oswald supersaturation–nucleation–depletion cycle. Segregation of Ca-rich veins, related to the formation of Ca(OH){sub 2}, is observed in microcracked regions due to the ongoing reaction between the pore solution and available calcium from remnant slag grains. A highly dense and uniform interfacial transition zone is identified between siliceous aggregate particles and the alkali activated slag binders, across the concretes assessed. Alkali-activated slag concretes retain a highly dense and stable microstructure at advanced ages, where any microcracks induced at early ages seem to be partially closing, and the remnant slag grains continue reacting.

  20. Understory plant communities and the functional distinction between savanna trees, forest trees, and pines.

    SciTech Connect (OSTI)

    Veldman, Joseph, W., Mattingly, Brett, W., Brudvig, Lars, A.

    2013-04-01

    Abstract. Although savanna trees and forest trees are thought to represent distinct functional groups with different effects on ecosystem processes, few empirical studies have examined these effects. In particular, it remains unclear if savanna and forest trees differ in their ability to coexist with understory plants, which comprise the majority of plant diversity in most savannas. We used structural equation modeling (SEM) and data from 157 sites across three locations in the southeastern United States to understand the effects of broadleaf savanna trees, broadleaf forest trees, and pine trees on savanna understory plant communities. After accounting for underlying gradients in fire frequency and soil moisture, abundances (i.e., basal area and stem density) of forest trees and pines, but not savanna trees, were negatively correlated with the cover and density (i.e., local-scale species richness) of C4 graminoid species, a defining savanna understory functional group that is linked to ecosystem flammability. In analyses of the full understory community, abundances of trees from all functional groups were negatively correlated with species density and cover. For both the C4 and full communities, fire frequency promoted understory plants directly, and indirectly by limiting forest tree abundance. There was little indirect influence of fire on the understory mediated through savanna trees and pines, which are more fire tolerant than forest trees. We conclude that tree functional identity is an important factor that influences overstory tree relationships with savanna understory plant communities. In particular, distinct relationships between trees and C4 graminoids have implications for grass-tree coexistence and vegetation-fire feedbacks that maintain savanna environments and their associated understory plant diversity.

  1. Automatic Segmentation Using Non-Rigid Registration Kilian M. Pohl1, Sylvain Bouix2, Martha .E. Shenton2, W. Eric L. Grimson1, and Ron

    E-Print Network [OSTI]

    and is applicable to a wide variety of image acquisition protocols. 1 Prologue Our segmentation pipeline (Figure 1 have a reduced risk of systematic biases [2]. The next section will explain in detail the four steps that compose the segmentation pipeline. 2 Segmentation Pipeline Step 1 - Intensity Normalization: An intensity

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

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01

    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. 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)

    2002-01-01

    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.

  4. The importance of having an appropriate relational data segmentation in ATLAS

    E-Print Network [OSTI]

    Dimitrov, Gancho; The ATLAS collaboration

    2015-01-01

    In this paper we describe specific technical solutions put in place in various database applications of the ATLAS experiment at LHC where we make use of several partitioning techniques available in Oracle 11g. With the broadly used range partitioning and its option of automatic interval partitioning we add our own logic in PLSQL procedures and scheduler jobs to sustain data sliding windows in order to enforce various data retention policies. We also make use of the new Oracle 11g reference partitioning in the Nightly Build System to achieve uniform data segmentation. However the most challenging issue was to segment the data of the new ATLAS Distributed Data Management system (Rucio), which resulted in tens of thousands list type partitions and sub-partitions. Partition and sub-partition management, index strategy, statistics gathering and queries execution plan stability are important factors when choosing an appropriate physical model for the application data management. The so-far accumulated knowledge and...

  5. Generator Bidding Strategies in a Competitive Electricity Market with Derating and Bid-Segment Considerations

    SciTech Connect (OSTI)

    Lu, Ning; Chow, Joe H.; Desrochers, Alan A.

    2009-07-31

    This paper develops optimal generator bidding strategies in a competitive electricity market. Starting from a generator’s cost curve, basic bidding concepts such as the break-even bid curve and the maximum profit bid curve can be readily derived. The maximum profit bid curve can be extended to account for generator availability and derating. In addition, multiple-segment block energy bids can be optimized based on the maximum profit curve and the probabilistic distribution of market clearing prices.

  6. Determination of shower central position in laterally segmented lead-fluoride electromagnetic calorimeters

    E-Print Network [OSTI]

    M. Mazouz; L. Ghedira; E. Voutier

    2015-10-02

    The spatial resolution of laterally segmented electromagnetic calorimeters is studied on the basis of Monte-Carlo simulations worked-out for lead fluoride material. Parametrization of the relative resolution is proposed and optimized in terms of the energy of incoming particles and the elementary size of the calorimeter blocks. A new fit algorithm method is proposed that improves spatial resolution at high energies, and provides guidance for the design optimization of electromagnetic calorimeters.

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

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01

    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.

  8. Determination of shower central position in laterally segmented lead-fluoride electromagnetic calorimeters

    E-Print Network [OSTI]

    Mazouz, M; Voutier, E

    2015-01-01

    The spatial resolution of laterally segmented electromagnetic calorimeters is studied on the basis of Monte-Carlo simulations worked-out for lead fluoride material. Parametrization of the relative resolution is proposed and optimized in terms of the energy of incoming particles and the elementary size of the calorimeter blocks. A new fit algorithm method is proposed that improves spatial resolution at high energies, and provides guidance for the design optimization of electromagnetic calorimeters.

  9. 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

    2007-11-19

    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.

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

    SciTech Connect (OSTI)

    Grazzini, Jacopo; Prasad, Lakshman; Dillard, Scott

    2010-10-21

    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.

  11. EVALUATION AND BENCHMARK FOR BIOLOGICAL IMAGE SEGMENTATION Elisa Drelie Gelasca, Jiyun Byun, Boguslaw Obara, B.S. Manjunath

    E-Print Network [OSTI]

    California at Santa Barbara, University of

    value to the image processing re- searchers is that the data comes with associated ground truth in evaluating and benchmarking new technologies. This is par- ticularly important in image processing methods) (Retinal layers Microtubule tracing Cell segmentation Retinal layer

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

    E-Print Network [OSTI]

    Khanshour, Anas M

    2013-07-05

    as c testing usi lites analys enetic analy segments e 2 shows ified fragm ample of S are th tes s). the ng is, sis of an ent TR gen res Fig hom wit sou mic alle otyping in pectively. ure 3: An il ozygous...

  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

    2015-01-01

    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. Pulse shape analysis in segmented detectors as a technique for background reduction in Ge double-beta decay experiments

    E-Print Network [OSTI]

    S. R. Elliott; V. M. Gehman; K. Kazkaz; D-M. Mei; A. R. Young

    2005-09-20

    The need to understand and reject backgrounds in Ge-diode detector double-beta decay experiments has given rise to the development of pulse shape analysis in such detectors to discern single-site energy deposits from multiple-site deposits. Here, we extend this analysis to segmented Ge detectors to study the effectiveness of combining segmentation with pulse shape analysis to identify the multiplicity of the energy deposits.

  15. Doppler segmentation 

    E-Print Network [OSTI]

    Yeh, Chih-Ping

    1983-01-01

    OF CONTENTS ABSTRACT . ACKNOWLEDGEMENT TABLE OF CONTENTS LIST OF FIGURES CHAPTER I. INTRODUCTION . CHAPTER II. SYSTEM DEVELOPMENT 1. Range Imaging System 2. Range and Velocity Acquisition by Linear FM Pulse . 3. Infrared Range/Doppler Imaging System... . CHAPTER III. SYSTEM PARAMETERS DESIGN l. Angular Resolution and Aperture Size 2. Pulse Repetition Frequency and Detector Array for Compact Image . 3. Pulse Duration and Velocity Sensitivity . 4. Pulse Modulation Bandwidth and Range Resolution 5...

  16. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMassR&D100Nationalquestionnaires 0 Averagequestionnaires 7tniLighting

  17. 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.)

    2002-08-01

    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.

  18. Fish Population and Behavior Revealed by Instantaneous

    E-Print Network [OSTI]

    Fish Population and Behavior Revealed by Instantaneous Continental Shelf­Scale Imaging Nicholas C-transect methods from slow-moving research vessels. These methods significantly undersample fish populations in time and space, leaving an incomplete and ambiguous record of abundance and behavior. We show that fish

  19. Life history, longevity and aging Population ecology

    E-Print Network [OSTI]

    Wilkinson, Gerald S.

    = intrinsic rate of population growth dN/dt = (b-d)N = rN "r-selected" #12;Logistic population growth Addition of a density dependent term results in logistic growth K = carrying capacity dN/dt = rN (K-N)/K "K to allocation of resources between maintenance and reproduction #12;Reproductive value · Age

  20. Populations of Galaxies Building a Galaxy

    E-Print Network [OSTI]

    Crenshaw, Michael

    hydrogen fusion), M > 100M! (star's radiation pressure exceeds gravity) (M) M Salpeter (1955) = 2.35 Total-Luminosity Relations · Initial Mass Function · Star Formation Rates · Heavy Element Enrichment · Evolution spectrum and determine predicted colors for a population of stars? · Start a population with an initial

  1. Population density of San Joaquin kit fox

    SciTech Connect (OSTI)

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

    1982-01-01

    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)

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

    E-Print Network [OSTI]

    George D. J. Phillies

    2011-02-21

    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.

  3. High-precision flexible fabrication of tissue engineering scaffolds using distinct polymers

    SciTech Connect (OSTI)

    Wei, Chuang [North Carolina State University; Cai, Lei [ORNL; Sonawane, Bhushan [North Carolina State University; Wang, Shanfeng [ORNL; Dong, Jingyan [North Carolina State University

    2012-01-01

    Three-dimensional porous structures using biodegradable materials with excellent biocompatibility are critically important for tissue engineering applications. We present a multi-nozzle-based versatile deposition approach to flexibly construct porous tissue engineering scaffolds using distinct polymeric biomaterials such as thermoplastic and photo-crosslinkable polymers. We first describe the development of the deposition system and fabrication of scaffolds from two types of biodegradable polymers using this system. The thermoplastic sample is semi-crystalline poly({var_epsilon}-caprolactone) (PCL) that can be processed at a temperature higher than its melting point and solidifies at room temperature. The photo-crosslinkable one is polypropylene fumarate (PPF) that has to be dissolved in a reactive solvent as a resin for being cured into solid structures. Besides the direct fabrication of thermoplastic PCL scaffolds, we specifically develop a layer molding approach for the fabrication of crosslinkable polymers, which traditionally can only be fabricated by stereolithography. In this approach, a thermoplastic supporting material (paraffin wax) is first deposited to make a mold for each specific layer, and then PPF is deposited on demand to fill the mold and cured by the UV light. The supporting material can be removed to produce a porous scaffold of crosslinked PPF. Both PCL and crosslinked PPF scaffolds fabricated using the developed system have been characterized in terms of compressive mechanical properties, morphology, pore size and porosity. Mouse MC3T3-E1 pre-osteoblastic cell studies on the fabricated scaffolds have been performed to demonstrate their capability of supporting cell proliferation and ingrowth, aiming for bone tissue engineering applications.

  4. 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.

    2008-05-02

    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.

  5. Spatial regulation of a common precursor from two distinct genes generates metabolite diversity

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

    Guo, Chun -Jun; Sun, Wei -Wen; Bruno, Kenneth S.; Oakley, Berl R.; Keller, Nancy P.; Wang, Clay C. C.

    2015-07-13

    In secondary metabolite biosynthesis, core synthetic genes such as polyketide synthase genes usually encode proteins that generate various backbone precursors. These precursors are modified by other tailoring enzymes to yield a large variety of different secondary metabolites. The number of core synthesis genes in a given species correlates, therefore, with the number of types of secondary metabolites the organism can produce. In our study, heterologous expression of all the A. terreus NRPSlike genes showed that two NRPS-like proteins, encoded by atmelA and apvA, release the same natural product, aspulvinone E. In hyphae this compound is converted to aspulvinones whereas inmore »conidia it is converted to melanin. The genes are expressed in different tissues and this spatial control is probably regulated by their own specific promoters. Comparative genomics indicates that atmelA and apvA might share a same ancestral gene and the gene apvA is located in a highly conserved region in Aspergillus species that contains genes coding for life-essential proteins. Our data reveal the first case in secondary metabolite biosynthesis in which the tissue specific production of a single compound directs it into two separate pathways, producing distinct compounds with different functions. Our data also reveal that a single trans-prenyltransferase, AbpB, prenylates two substrates, aspulvinones and butyrolactones, revealing that genes outside of contiguous secondary metabolism gene clusters can modify more than one compound thereby expanding metabolite diversity. Our study raises the possibility of incorporation of spatial, cell-type specificity in expression of secondary metabolites of biological interest and provides new insight into designing and reconstituting their biosynthetic pathways.« less

  6. 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

  7. A Multiphase Validation of Atlas-Based Automatic and Semiautomatic Segmentation Strategies for Prostate MRI

    SciTech Connect (OSTI)

    Martin, Spencer; Rodrigues, George; Department of Epidemiology Patil, Nikhilesh; Bauman, Glenn; Department of Radiation Oncology, London Regional Cancer Program, London ; D'Souza, David; Sexton, Tracy; Palma, David; Louie, Alexander V.; Khalvati, Farzad; Tizhoosh, Hamid R.; Segasist Technologies, Toronto, Ontario ; Gaede, Stewart

    2013-01-01

    Purpose: To perform a rigorous technological assessment and statistical validation of a software technology for anatomic delineations of the prostate on MRI datasets. Methods and Materials: A 3-phase validation strategy was used. Phase I consisted of anatomic atlas building using 100 prostate cancer MRI data sets to provide training data sets for the segmentation algorithms. In phase II, 2 experts contoured 15 new MRI prostate cancer cases using 3 approaches (manual, N points, and region of interest). In phase III, 5 new physicians with variable MRI prostate contouring experience segmented the same 15 phase II datasets using 3 approaches: manual, N points with no editing, and full autosegmentation with user editing allowed. Statistical analyses for time and accuracy (using Dice similarity coefficient) endpoints used traditional descriptive statistics, analysis of variance, analysis of covariance, and pooled Student t test. Results: In phase I, average (SD) total and per slice contouring time for the 2 physicians was 228 (75), 17 (3.5), 209 (65), and 15 seconds (3.9), respectively. In phase II, statistically significant differences in physician contouring time were observed based on physician, type of contouring, and case sequence. The N points strategy resulted in superior segmentation accuracy when initial autosegmented contours were compared with final contours. In phase III, statistically significant differences in contouring time were observed based on physician, type of contouring, and case sequence again. The average relative timesaving for N points and autosegmentation were 49% and 27%, respectively, compared with manual contouring. The N points and autosegmentation strategies resulted in average Dice values of 0.89 and 0.88, respectively. Pre- and postedited autosegmented contours demonstrated a higher average Dice similarity coefficient of 0.94. Conclusion: The software provided robust contours with minimal editing required. Observed time savings were seen for all physicians irrespective of experience level and baseline manual contouring speed.

  8. Total Measurement Uncertainty for the Plutonium Finishing Plant (PFP) Segmented Gamma Scan Assay System

    SciTech Connect (OSTI)

    WESTSIK, G.A.

    2001-06-06

    This report presents the results of an evaluation of the Total Measurement Uncertainty (TMU) for the Canberra manufactured Segmented Gamma Scanner Assay System (SGSAS) as employed at the Hanford Plutonium Finishing Plant (PFP). In this document, TMU embodies the combined uncertainties due to all of the individual random and systematic sources of measurement uncertainty. It includes uncertainties arising from corrections and factors applied to the analysis of transuranic waste to compensate for inhomogeneities and interferences from the waste matrix and radioactive components. These include uncertainty components for any assumptions contained in the calibration of the system or computation of the data. Uncertainties are propagated at 1 sigma. The final total measurement uncertainty value is reported at the 95% confidence level. The SGSAS is a gamma assay system that is used to assay plutonium and uranium waste. The SGSAS system can be used in a stand-alone mode to perform the NDA characterization of a container, particularly for low to medium density (0-2.5 g/cc) container matrices. The SGSAS system provides a full gamma characterization of the container content. This document is an edited version of the Rocky Flats TMU Report for the Can Scan Segment Gamma Scanners, which are in use for the plutonium residues projects at the Rocky Flats plant. The can scan segmented gamma scanners at Rocky Flats are the same design as the PFP SGSAS system and use the same software (with the exception of the plutonium isotopics software). Therefore, all performance characteristics are expected to be similar. Modifications in this document reflect minor differences in the system configuration, container packaging, calibration technique, etc. These results are supported by the Quality Assurance Objective (QAO) counts, safeguards test data, calibration data, etc. for the PFP SGSAS system. Other parts of the TMU analysis utilize various modeling techniques such as Monte Carlo N-Particle (MCNP) and In Situ Object Counting Software (ISOCS).

  9. 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

  10. Distinction in Chemistry: Thesis Guidelines Paper: The thesis should be printed on good quality 8 " x 11" paper.

    E-Print Network [OSTI]

    Doyle, Robert

    Distinction in Chemistry: Thesis Guidelines Format Paper: The thesis should be printed on good. This applies to the entire thesis, including title page, all appendices, diagrams and figures. Top, bottom, and right margins should be 1". Type: The thesis should be printed in at least 12 point font. Line Spacing

  11. 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

  12. Distinct osmo-sensing protein kinase pathways are involved in signalling moderate and severe hyper-osmotic

    E-Print Network [OSTI]

    Hirt, Heribert

    Distinct osmo-sensing protein kinase pathways are involved in signalling moderate and severe hyper-osmotic is severely affected by hyper-osmotic salt conditions. Although a number of salt-induced genes have been and extreme hyper-osmotic conditions. A 46 kDa protein kinase was found to be activated by elevated salt

  13. 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

  14. Highly polarized light emission by isotropic quantum dots integrated with magnetically aligned segmented nanowires

    SciTech Connect (OSTI)

    Uran, Can; Erdem, Talha; Guzelturk, Burak; Perkgöz, Nihan Kosku; Jun, Shinae; Jang, Eunjoo; Demir, Hilmi Volkan

    2014-10-06

    In this work, we demonstrate a proof-of-concept system for generating highly polarized light from colloidal quantum dots (QDs) coupled with magnetically aligned segmented Au/Ni/Au nanowires (NWs). Optical characterizations reveal that the optimized QD-NW coupled structures emit highly polarized light with an s-to p-polarization (s/p) contrast as high as 15:1 corresponding to a degree of polarization of 0.88. These experimental results are supported by the finite-difference time-domain simulations, which demonstrate the interplay between the inter-NW distance and the degree of polarization.

  15. 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

    2009-02-24

    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.

  16. 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.

    2004-04-12

    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.

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

    SciTech Connect (OSTI)

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

    2013-01-01

    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.

  18. A Decade of Population Change in Texas. 

    E-Print Network [OSTI]

    Skrabanek, R. L.

    1963-01-01

    .4 36.4 27.8 19.7 24.9 10.1 20.2 24.2 Source: U.S. Bureau of Census, PC (1) 45A-Texas, Table 1. only three states, California, Florida and New York. The state had 5.1 percent of the nation's people in 1950 and 5.3 percent in 1960. Texas ranks... sixth in comparison with other states in total population, the same position it held in 1950. States having larger population in 1960 were New York, California, Pennsylvania, Illinois and Ohio. Population Density Although Texas ranks sixth in total...

  19. 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.

    2014-01-03

    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.

  20. Hanford Site Regional Population - 2010 Census

    SciTech Connect (OSTI)

    Hamilton, Erin L.; Snyder, Sandra F.

    2011-08-12

    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.

  1. New thermal model with distinct freeze-out temperatures for baryons and mesons

    SciTech Connect (OSTI)

    De Assis, Leonardo P. G.; Duarte, Sergio B.; Chiapparini, Marcelo; Hirsch, Luciana R.; Delfino, Antonio Jr.

    2013-05-06

    A significant amount of experimental data for particle production in high-energy heavy ion collisions (10 - 200 GeV/A at center of mass) has been accumulated during last years. Many different theoretical attempts have tried to describe these data using thermal models in the approximation of global thermal equilibrium considering only one freeze-out temperature. However the thermal models often are not able to describe adequately the whole multiplicities of hadrons. For instance, the abundance of strange particles is overestimate and the pion yields are underestimated. In this work is presented a thermal hadronic model with two different temperatures in order to describe the baryonic and mesonic chemical freeze-out in ultra-relativistic heavy ion collisions. The model is used to fit the particle population ratios of the hadrons produced in the reaction. The proposal is not merely to incorporate one additional degree of freedom in the adjustment procedure of data, but to present and alternative scenario for the freeze out stage in the collisional proces s. This new reformulated version of thermal model was applied to a set of data, offering a rather good improvement in the fitting of the calculated particle ratios to the data. The results suggest that the introduced model makes the thermal approach more robust to handle with a larger number of colliding systems and a more comprehensive set of reaction observables.

  2. Seismic fragility formulations for segmented buried pipeline systems including the impact of differential ground subsidence

    SciTech Connect (OSTI)

    Pineda Porras, Omar Andrey; Ordaz, Mario

    2009-01-01

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

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

    Yannouleas, Constantine; Romanovsky, Igor; Landman, Uzi

    2015-01-20

    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 themore »NEGF results, including optical Dirac Fabry-Pérot (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.« less

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

    E-Print Network [OSTI]

    Constantine Yannouleas; Igor Romanovsky; Uzi Landman

    2015-02-01

    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.

  5. 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

  6. The Population Structure of Ten Newfoundland Outports

    E-Print Network [OSTI]

    Martin, L. J.; Crawford, Michael H.; Koertvelyessy, T. A.; Keeping, D.; Collins, M.; Huntsman, R.

    2000-12-01

    mean per-locus heterozygosity on genetic distance from the gene frequency centroid to identify the most isolated populations. On the basis of this information, the three outports of Seal Cove, Island Harbor, and Tilting were found to be genetically...

  7. ORIGINAL PAPER Morphological differentiation among populations

    E-Print Network [OSTI]

    Langerhans, Brian

    vertebral column). We investigated inter-population variation in survival rate, abundance of predators presacral vertebral column, and narrower head in sites with increased abundance of spiders and snakes

  8. Neoclassical formulations of optimum population theory 

    E-Print Network [OSTI]

    Davis, Glenn Anthony

    1971-01-01

    population concept and concludes wi. th an analysis of its modern-day version. There is widespread belief that this concept msy have originated from the so-called ulawu of secular diminishing returns as formulated by Ricardo and West. However... on the other, would be inadequate. D. P. Mukerji has noted that the development of economic thought contained within itself a motive power for the drive towards the optimum [25, 155]. Rudiments of the ides of optimum population have been detected...

  9. The Hubble Space Telescope UV Legacy Survey of galactic globular clusters. VI. The internal kinematics of the multiple stellar populations in NGC 2808

    E-Print Network [OSTI]

    Bellini, A; Piotto, G; Milone, A P; Hong, J; Anderson, J; van der Marel, R P; Bedin, L R; Cassisi, S; D'Antona, F; Marino, A F; Renzini, A

    2015-01-01

    Numerous observational studies have revealed the ubiquitous presence of multiple stellar populations in globular clusters and cast many hard challenges for the study of the formation and dynamical history of these stellar systems. In this Letter we present the results of a study of the kinematic properties of multiple populations in NGC 2808 based on high-precision Hubble Space Telescope proper-motion measurements. In a recent study, Milone et al. have identified five distinct populations (A, B, C, D, and E) in NGC 2808. Populations D and E coincide with the helium-enhanced populations in the middle and the blue main sequences (mMS and bMS) previously discovered by Piotto et al.; populations A, B, and C correspond to the redder main sequence (rMS) that in the Piotto et al. was associated with the primordial stellar population. Our analysis shows that, in the outermost regions probed (between about 1.5 and 2 times the cluster half-light radius), the velocity distribution of populations D and E is radially anis...

  10. Distinct Length Scales in the VO{sub 2} Metal–Insulator Transition Revealed by Bi-chromatic Optical Probing

    SciTech Connect (OSTI)

    Wang, Lei [College of William and Mary, Williamsburg, VA (United States); Novikova, Irina B. [College of William and Mary, Williamsburg, VA (United States); Klopf, John M. [JLAB, Newport News, VA (United States); Madaras, Scott E. [JLAB, Newport News, VA (United States); Williams, Gwyn P. [College of William and Mary, Williamsburg, VA (United States); Madaras, Eric [Nasa Langley Research Center, Hampton, VA (United States); Lu, Liwei [Univ. of Virginia, Charlottesville, VA (United States); Wolf, Stuart A. [Univ. of Virginia, Charlottesville, VA (United States); Lukaszew, Rosa A. [College of William and Mary, Williamsburg, VA (United States)

    2014-01-01

    Upon a heating-induced metal–instulator transition (MIT) in VO{sub 2}, microscopic metallic VO{sub 2} puddles nucleate and coarsen within the insulating matrix. This coexistence of the two phases across the transition spans distinct length scales as their relative domain sizes change. Far-field optical probing is applied to follow the dynamic evolution of the highly correlated metallic domains as the MIT progresses.

  11. 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)

    2001-01-01

    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.

  12. THE BLUE STRAGGLER STAR POPULATION IN NGC 1261: EVIDENCE FOR A POST-CORE-COLLAPSE BOUNCE STATE

    SciTech Connect (OSTI)

    Simunovic, Mirko; Puzia, Thomas H.; Sills, Alison E-mail: tpuzia@astro.puc.cl

    2014-11-01

    We present a multi-passband photometric study of the Blue Straggler Star (BSS) population in the Galactic globular cluster (GC) NGC 1261, using available space- and ground-based survey data. The inner BSS population is found to have two distinct sequences in the color-magnitude diagram (CMD), similar to double BSS sequences detected in other GCs. These well defined sequences are presumably linked to single short-lived events such as core collapse, which are expected to boost the formation of BSSs. In agreement with this, we find a BSS sequence in NGC 1261 which can be well reproduced individually by a theoretical model prediction of a 2 Gyr old population of stellar collision products, which are expected to form in the denser inner regions during short-lived core contraction phases. Additionally, we report the occurrence of a group of BSSs with unusually blue colors in the CMD, which are consistent with a corresponding model of a 200 Myr old population of stellar collision products. The properties of the NGC 1261 BSS populations, including their spatial distributions, suggest an advanced dynamical evolutionary state of the cluster, but the core of this GC does not show the classical signatures of core collapse. We argue that these apparent contradictions provide evidence for a post-core-collapse bounce state seen in dynamical simulations of old GCs.

  13. Method of controlling the side wall thickness of a turbine nozzle segment for improved cooling

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01

    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.

  14. CHARACTERIZING COMPLEXITY IN SOLAR MAGNETOGRAM DATA USING A WAVELET-BASED SEGMENTATION METHOD

    SciTech Connect (OSTI)

    Kestener, P.; Khalil, A.; Arneodo, A.

    2010-07-10

    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.

  15. 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)

    2014-02-15

    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.

  16. Apparatus for impingement cooling a side wall adjacent an undercut region of a turbine nozzle segment

    DOE Patents [OSTI]

    Burdgick, Steven Sebastian (Schenectady, NY)

    2002-01-01

    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.

  17. 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

    2007-04-23

    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.

  18. Environmental Impacts of Wind Power Development on the Population...

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

    Environmental Impacts of Wind Power Development on the Population Biology of Greater Prairie-Chickens Environmental Impacts of Wind Power Development on the Population Biology of...

  19. Fact #661: February 7, 2011 Population Density | Department of...

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

    states, the population is generally less dense, with the exceptions being California, Hawaii, and Washington. Every state except Michigan experienced increased population density...

  20. How should environmental stress affect the population dynamics of disease?

    E-Print Network [OSTI]

    Holt, Robert D.

    in pollution (Khan 1990), malnutrition (Beck & Levander 2000) and thermal stress from climate change (Harvell and disease in natural populations. Keywords Disease, dynamics, host, infectious, model, pollution, population

  1. Level-set segmentation of pulmonary nodules in megavolt electronic portal images using a CT prior

    SciTech Connect (OSTI)

    Schildkraut, J. S.; Prosser, N.; Savakis, A.; Gomez, J.; Nazareth, D.; Singh, A. K.; Malhotra, H. K.

    2010-11-15

    Purpose: Pulmonary nodules present unique problems during radiation treatment due to nodule position uncertainty that is caused by respiration. The radiation field has to be enlarged to account for nodule motion during treatment. The purpose of this work is to provide a method of locating a pulmonary nodule in a megavolt portal image that can be used to reduce the internal target volume (ITV) during radiation therapy. A reduction in the ITV would result in a decrease in radiation toxicity to healthy tissue. Methods: Eight patients with nonsmall cell lung cancer were used in this study. CT scans that include the pulmonary nodule were captured with a GE Healthcare LightSpeed RT 16 scanner. Megavolt portal images were acquired with a Varian Trilogy unit equipped with an AS1000 electronic portal imaging device. The nodule localization method uses grayscale morphological filtering and level-set segmentation with a prior. The treatment-time portion of the algorithm is implemented on a graphical processing unit. Results: The method was retrospectively tested on eight cases that include a total of 151 megavolt portal image frames. The method reduced the nodule position uncertainty by an average of 40% for seven out of the eight cases. The treatment phase portion of the method has a subsecond execution time that makes it suitable for near-real-time nodule localization. Conclusions: A method was developed to localize a pulmonary nodule in a megavolt portal image. The method uses the characteristics of the nodule in a prior CT scan to enhance the nodule in the portal image and to identify the nodule region by level-set segmentation. In a retrospective study, the method reduced the nodule position uncertainty by an average of 40% for seven out of the eight cases studied.

  2. Performance characterization of a MVCT scanner using multislice thick, segmented cadmium tungstate-photodiode detectors

    SciTech Connect (OSTI)

    Kirvan, P. F.; Monajemi, T. T.; Fallone, B. G.; Rathee, S. [Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1 (Canada); Department of Medical Physics, Cross Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada); Department of Medical Physics, Cross Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada); Department of Oncology, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada) and Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1 (Canada); Department of Medical Physics, Cross Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada) and Department of Oncology, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada)

    2010-01-15

    Purpose: Megavoltage computed tomography (MVCT) and megavoltage cone beam computed tomography (MVCBCT) can be used for visualizing anatomical structures prior to radiation therapy treatments to assist in patient setup and target localization. These systems are less susceptible to metal artifacts and provide better CT number linearity than conventional CT scanners. However, their contrast is limited by the properties of the megavoltage photons and the low detective quantum efficiency (DQE) of flat panel detector systems currently available. By using higher DQE, thick, segmented cadmium tungstate detectors, the authors can improve the low contrast detectability of a MVCT system. This in turn would permit greater soft tissue visualization for a given radiation dose, allowing MVCT to be used in more clinical situations. Methods: This article describes the evaluation of our prototype system that uses thick, segmented detectors. In order to create images using a dose that would be acceptable for day to day patient imaging, the authors evaluated their system using the low intensity bremsstrahlung component of a 6 MeV electron beam. The system was evaluated for its uniformity, high contrast resolution, low contrast detectability, signal to noise ratio, contrast to noise ratio, and CT number linearity. Results: The prototype system was found to have a high contrast spatial resolution of about 5 line pairs per cm, and to be able to visualize a 15 mm 1.5% contrast target with 2 cGy of radiation dose delivered. SNR{sup 2} vs radiation dose and mean pixel value vs electron density curves were linear. Conclusions: This prototype system shows a large improvement in low contrast detectability over current MVCBCT systems.

  3. Identification of breast contour for nipple segmentation in breast magnetic resonance images

    SciTech Connect (OSTI)

    Gwo, Chih-Ying [Department of Information Management, Chien Hsin University of Science and Technology, Taoyuan 320, Taiwan (China)] [Department of Information Management, Chien Hsin University of Science and Technology, Taoyuan 320, Taiwan (China); Gwo, Allen [Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712 (United States)] [Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712 (United States); Wei, Chia-Hung, E-mail: rogerwei@uch.edu.tw [Department of Information Management, Chien Hsin University of Science and Technology, Taoyuan 320, Taiwan and Graduate Institute of Biomedical Informatics, Taipei Medical University, Taipei 110, Taiwan (China)] [Department of Information Management, Chien Hsin University of Science and Technology, Taoyuan 320, Taiwan and Graduate Institute of Biomedical Informatics, Taipei Medical University, Taipei 110, Taiwan (China); Huang, Pai Jung [Graduate Institute of Biomedical Informatics, Taipei Medical University, Taipei 110, Taiwan and Comprehensive Breast Health Center, Taipei Medical University Hospital, Taipei 110, Taiwan (China)] [Graduate Institute of Biomedical Informatics, Taipei Medical University, Taipei 110, Taiwan and Comprehensive Breast Health Center, Taipei Medical University Hospital, Taipei 110, Taiwan (China)

    2014-02-15

    Purpose: The purpose of this study is to develop a method to simulate the breast contour and segment the nipple in breast magnetic resonance images. Methods: This study first identifies the chest wall and removes the chest part from the breast MR images. Subsequently, the cleavage and its motion artifacts are removed, distinguishing the separate breasts, where the edge points are sampled for curve fitting. Next, a region growing method is applied to find the potential nipple region. Finally, the potential nipple region above the simulated curve can be removed in order to retain the original smooth contour. Results: The simulation methods can achieve the least root mean square error (RMSE) for certain cases. The proposed YBnd and (Dmin+Dmax)/2 methods are significant due toP = 0.000. The breast contour curve detected by the two proposed methods is closer than that determined by the edge detection method. The (Dmin+Dmax)/2 method can achieve the lowest RMSE of 1.1029 on average, while the edge detection method results in the highest RMSE of 6.5655. This is only slighter better than the comparison methods, which implies that the performance of these methods depends upon the conditions of the cases themselves. Under this method, the maximal Dice coefficient is 0.881, and the centroid difference is 0.36 pixels. Conclusions: The contributions of this study are twofold. First, a method was proposed to identify and segment the nipple in breast MR images. Second, a curve-fitting method was used to simulate the breast contour, allowing the breast to retain its original smooth shape.

  4. 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

  5. Population dynamics of the Concho water snake 

    E-Print Network [OSTI]

    Mueller, James Michael

    1990-01-01

    Recruitment B. SE Capture Probability SE 15 Sep 1987 8 Oct 1987 23 Apr 1988 13 Aug 1988 22 May 1989 19 Jul 1989 14-16 Sep 6-19 Oct 13 Apr-4 May 31 Aug. 27 Sep 17 May-15 Jun 29 Jun-9 Aug 21. 0 15. 7 54. 7 48. 1 15 0 e*** 2/ 0 **** **** ee*e... **a*** Table 12. Jolly-Saber estimates and standard errors for the 1988 sge class of e Concho water snake population st Egan Dairy on the Colorado River, Texas. Population Size Survival Probability Recruitment Capture Probability 31 Aug 1988...

  6. A 19.1dBm Segmented Power-Mixer Based Multi-Gbps mm-Wave Transmitter in 32nm SOI CMOS

    E-Print Network [OSTI]

    Hajimiri, Ali

    A 19.1dBm Segmented Power-Mixer Based Multi-Gbps mm-Wave Transmitter in 32nm SOI CMOS Kaushik Abstract -- A high-power, fully-integrated, mm-wave power mixer based transmitter capable of generating case segmentation at 30% higher supply voltage. Index Terms -- mm-wave, , Power Mixer, CMOS Power

  7. An LED, fiber optic, gain monitoring system for a segmented scintillator array B.E. Bewer, R.E. Pywell , R. Igarashi 1

    E-Print Network [OSTI]

    Saskatchewan, University of

    An LED, fiber optic, gain monitoring system for a segmented scintillator array B.E. Bewer, R Keywords: Scintillator Gain monitor Fiber optics LED a b s t r a c t A gain monitoring system, which uses with a segmented, liquid scintillator neutron detector array. The system is designed to track neutron detector cell

  8. IEEE TRANSACTIONS ON MEDICAL IMAGING, VOL. 16, NO. 6, DECEMBER 1997 785 Fractal Modeling and Segmentation for the

    E-Print Network [OSTI]

    Liu, K. J. Ray

    . It may also be able to improve the detection and classification of microcalcifications in a computer-aided and Segmentation for the Enhancement of Microcalcifications in Digital Mammograms Huai Li, Member, IEEE, K. J. Ray computer-aided diagnosis systems, which can serve as a "prereader" to the radiologist and give the radiolo

  9. Mitral annulus segmentation from four-dimensional ultrasound using a valve state predictor and constrained optical flow

    E-Print Network [OSTI]

    Mitral annulus segmentation from four-dimensional ultrasound using a valve state predictor, Children's Hospital, Boston, MA, USA Abstract Measurement of the shape and motion of the mitral valve annulus has proven useful in a number of applications, including pathology diagnosis and mitral valve

  10. Evaluation of the Highway Safety Manual Crash Prediction Model for Rural Two-Lane Highway Segments in Kansas

    E-Print Network [OSTI]

    Lubliner, Howard

    2011-12-31

    While there have been numerous previous studies performed to develop the rural two-lane segment crash prediction models as part of the Highway Safety Manual (HSM), no previous study has been developed to validate the accuracy of the current model...

  11. IEEE TRANSACTIONS ON MEDICAL IMAGING, VOL. 20, NO. 8, AUGUST 2001 677 Automated Segmentation of Multiple Sclerosis

    E-Print Network [OSTI]

    of Multiple Sclerosis Lesions by Model Outlier Detection Koen Van Leemput*, Frederik Maes, Dirk Vandermeulen for segmentation of multiple sclerosis (MS) lesions from multispec- tral magnetic resonance (MR) images. The method measurements. Index Terms--Digital brain atlas, MRI, multiple sclerosis, tissue classification. I. INTRODUCTION

  12. Significant Nusselt number increase in microchannels with a segmented flow of two immiscible liquids: An experimental study

    E-Print Network [OSTI]

    Daraio, Chiara

    . For the segmented flow, up to four-fold increase of the Nusselt number was observed compared to pure water flow. Ó] achieved heat fluxes in excess of 10 kW/cm2 with flow boiling in small diameter tubes. However in microchannels as po- tential chemical reactors. Gunther et al. [6] reported the visualiza- tion

  13. IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 16, NO. 11, NOVEMBER 2007 2787 Image Segmentation Using Active Contours

    E-Print Network [OSTI]

    IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 16, NO. 11, NOVEMBER 2007 2787 Image Segmentation Using Active Contours Driven by the Bhattacharyya Gradient Flow Oleg Michailovich, Member, IEEE, Yogesh Rathi, and Allen Tannenbaum, Member, IEEE Abstract--This paper addresses the problem of image segmenta- tion

  14. 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

    1996-01-01

    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...

  15. 346 IEEE TRANSACTIONS ON BROADCASTING, VOL. 61, NO. 3, SEPTEMBER 2015 WVSNP-DASH: Name-Based Segmented

    E-Print Network [OSTI]

    Reisslein, Martin

    , and Martin Reisslein, Fellow, IEEE Abstract--Video streaming from sensors and miniaturized devices the individual video segments and a manifest file that contains video metadata. Also, existing web-based video-TCP/IP protocols, such as Zigbee. This paper proposes and evaluates a wireless video sensor network platform

  16. 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

  17. MCMC SAMPLING FOR JOINT SEGMENTATION OF WIND SPEED AND DIRECTION Nicolas Dobigeon and Jean-Yves Tourneret

    E-Print Network [OSTI]

    Tourneret, Jean-Yves

    MCMC SAMPLING FOR JOINT SEGMENTATION OF WIND SPEED AND DIRECTION Nicolas Dobigeon and Jean.dobigeon, jean-yves.tourneret}@enseeiht.fr ABSTRACT The problem of detecting changes in wind speed and direction for correlations between the wind speed and direction. A Gibbs sampling strategy overcomes the computational

  18. Effect of the degenerative state of the intervertebral disk on the impact characteristics of human spine segments

    E-Print Network [OSTI]

    Wilson, Sara E.; Alkalay, Ron; Myers, Elizabeth

    2013-12-01

    –L3 human spine segments with an end mass of 20.9 kg under increasing preloads with the resulting force response measured. A Kelvin–Voigt model, fitted to the frequency and decay response of the post-impact oscillations was used to compute stiffness...

  19. Effect of the Degenerative State of the Intervertebral Disk on the Impact Characteristics of Human Spine Segments

    E-Print Network [OSTI]

    Wilson, Sara E.; Alkalay, Ron; Myers, Elizabeth

    2013-11-01

    –L3 human spine segments with an end mass of 20.9 kg under increasing preloads with the resulting force response measured. A Kelvin–Voigt model, fitted to the frequency and decay response of the post-impact oscillations was used to compute stiffness...

  20. 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

  1. TU-F-18A-03: Improving Tissue Segmentation for Monte Carlo Dose Calculation Using DECT Data

    SciTech Connect (OSTI)

    Di, Salvio A; Bedwani, S; Carrier, J

    2014-06-15

    Purpose: To develop a new segmentation technique using dual energy CT (DECT) to overcome limitations related to segmentation from a standard Hounsfield unit (HU) to electron density (ED) calibration curve. Both methods are compared with a Monte Carlo analysis of dose distribution. Methods: DECT allows a direct calculation of both ED and effective atomic number (EAN) within a given voxel. The EAN is here defined as a function of the total electron cross-section of a medium. These values can be effectively acquired using a calibrated method from scans at two different energies. A prior stoichiometric calibration on a Gammex RMI phantom allows us to find the parameters to calculate EAN and ED within a voxel. Scans from a Siemens SOMATOM Definition Flash dual source system provided the data for our study. A Monte Carlo analysis compares dose distribution simulated by dosxyz-nrc, considering a head phantom defined by both segmentation techniques. Results: Results from depth dose and dose profile calculations show that materials with different atomic compositions but similar EAN present differences of less than 1%. Therefore, it is possible to define a short list of basis materials from which density can be adapted to imitate interaction behavior of any tissue. Comparison of the dose distributions on both segmentations shows a difference of 50% in dose in areas surrounding bone at low energy. Conclusion: The presented segmentation technique allows a more accurate medium definition in each voxel, especially in areas of tissue transition. Since the behavior of human tissues is highly sensitive at low energies, this reduces the errors on calculated dose distribution. This method could be further developed to optimize the tissue characterization based on anatomic site.

  2. Contributed Paper Population Consequences of Environmental Sex

    E-Print Network [OSTI]

    Cotton, Sam

    population sizes considerably. This may limit any evolutionary response to the deleterious effects of ESR sexuales y el crecimiento y persistencia de la poblaci´on despu´es de la exposici´on a fuerzas ambientales feminizaci´on moderada fue ben´efica para el crecimiento poblacional en la ausencia de efectos notables sobre

  3. 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

  4. Population genetic analyses suggest that the Eucalyptus

    E-Print Network [OSTI]

    Population genetic analyses suggest that the Eucalyptus fungal pathogen Ceratocystis fimbriata has , Brenda D. Wingfield a , Gilbert N. Kamgan b and Michael J. Wingfield a Introduction Eucalyptus species, with Eucalyptus comprising about 40% of the total area.3 This is an important crop that sustains large pulp, sawn

  5. Stoichiometry and population dynamics Tom Andersen,1

    E-Print Network [OSTI]

    Elser, Jim

    development, theoretical population biology has built on variants of the Lotka­Volterra equations stable states under stoichiometric constraints, for negative effects of solar radiation on herbivores via), dealing with the balance of energy and chemical elements in ecological interactions and especially

  6. Population Composition of an Exploited Hawaiian Fishery 

    E-Print Network [OSTI]

    Cockett, Patricia Malamalama

    2015-05-26

    the islands of Nihoa, Kaua‘i, Maui, O‘ahu, and Hawai‘i to test for relationships between genetic diversity, population size, island age, and harvest pressure. Global estimates of genetic differentiation among islands are greater than those estimated with mt...

  7. 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

    2006-12-23

    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.

  8. How do SNP ascertainment schemes and population demographics affect inferences about population history?

    E-Print Network [OSTI]

    McTavish, Emily Jane; Hills, David M.

    2015-03-17

    of population genetic parameters using empirical and simulated data representing the three major continental groups of cattle: European, African, and Indian. We simulated data under three demographic models. Each simulated data set was subjected to three...

  9. HLA Genes in the Chuvashian Population from European Russia: Admixture of Central European and Mediterranean Populations

    E-Print Network [OSTI]

    Arnaiz-Villena, Antonio; Martinez-Laso, Jorge; Moscoso, Juan; Livshits, Gregory; Zamora, Jorge; Gomez-Casado, Eduardo; Silvera-Redondo, Carlos; Melvin, Kristin L.; Crawford, Michael H.

    2003-06-01

    HLA alleles have been determined for the first time in individuals from the Chuvashian population by DNA typing and sequencing. HLA-A, -B, -DR, and -DQ allele frequencies and extended haplotypes have also been determined, ...

  10. The Genetic Structure of the Kuwaiti Population: mtDNA Inter- and Intra-population Variation

    E-Print Network [OSTI]

    Theyab, Jasem; Al-Bustan, Suzanne; Crawford, Michael H.

    2012-08-01

    it to their neighboring populations. These subpopulations were tested for genetic homogeneity and shown to be heterogeneous. Restriction fragment length polymorphism (RFLP) and mtDNA sequencing analyses of HVRI were used to reconstruct the genetic structure of Kuwait...

  11. Sensitivity and specificity of whole chromosome paint (WCP) probes are correlated with size of translocated segment

    SciTech Connect (OSTI)

    Qumsiyeh, M.B.; Peppers, J.A.

    1996-10-16

    Wiley et al. reported on a de novo {open_quotes}non-reciprocal translocation 1;8{close_quotes} as {open_quotes}confirmed{close_quotes} by whole chromosome paints (WCP). The assumption in this and similar papers is that WCP for one chromosome would light the ends of a derivative chromosome if the derivative chromosome carries such material and that the signal would be missing from donor chromosome. However, it has been our experience that WCP do not rule out reciprocal translocations involving small segments. Our lab has had three recent relevant examples: Case 1: A t(4;5)(p16.3;p15.3)mat. The initial discovery by G-banding was of a small piece of extra material on 4p in mother and child. Initial trials using a paint 4 probe on the mother`s metaphases, both in our laboratory and in another laboratory, failed to show signal on any other chromosome. The reciprocal 4;5 nature was demonstrated later using a cosmid to 4p. Painting with a chromosome 5 probe on metaphases from the mother with the rcp(4;5) showed apparently complete painting of both chromosome 5s in all cells. The signal from the WCP 5 probe on the derivative 4 was seen as a very small signal in only 30% of the cells. 4 refs.

  12. 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

    2014-11-27

    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.

  13. Who Will More Likely Buy PHEV: A Detailed Market Segmentation Analysis

    SciTech Connect (OSTI)

    Lin, Zhenhong [ORNL] [ORNL; Greene, David L [ORNL] [ORNL

    2010-01-01

    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.

  14. 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

    2015-06-26

    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.

  15. Bacterial Population Genetics in a Forensic Context

    SciTech Connect (OSTI)

    Velsko, S P

    2009-11-02

    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

  16. Obstacle to populating the string theory landscape

    SciTech Connect (OSTI)

    Johnson, Matthew C; Larfors, Magdalena

    2008-12-15

    We construct domain walls and instantons in a class of models with coupled scalar fields, determining, in agreement with previous studies, that many such solutions contain naked timelike singularities. Vacuum bubble solutions of this type do not contain a region of true vacuum, obstructing the ability of eternal inflation to populate other vacua. We determine a criterion that potentials must satisfy to avoid the existence of such singularities and show that many domain wall solutions in type IIB string theory are singular.

  17. Presented by LandScan Population Research

    E-Print Network [OSTI]

    by UT-Battelle for the U.S. Department of Energy Bhaduri_LandScan_SC10 Kosovo Refugee Crisis 1998 May 25 of Energy Bhaduri_LandScan_SC10 What is LandScan? Population distribution model, database, and tool people are located #12;3 Managed by UT-Battelle for the U.S. Department of Energy Bhaduri_LandScan_SC10

  18. Comparing Two Population Proportions March 4, 2010

    E-Print Network [OSTI]

    Lega, Joceline

    Comparing Two Population Proportions March 4, 2010 In this worksheet, we will test whether or not the proportions of blue M&M's and red M&M's in a random package are the same. Before beginning, do you think&M's, this is n1. Count the total number of red M&M's and compute the proportion. This is p1. n1 = p1 = 3. Open

  19. Stellar populations in the Phoenix dwarf galaxy

    E-Print Network [OSTI]

    Enrico V. Held; Ivo Saviane; Yazan Momany

    1999-03-01

    We have obtained deep BVI CCD photometry of Phoenix, a galaxy considered a transition case between dwarf spheroidal and dwarf irregular galaxies. A comparison of our data with the RGBs of Galactic globular clusters gives a mean metal abundance [Fe/H] = -1.81+/-0.10 dex. The presence of an intrinsic color dispersion in the upper red RGB suggests an abundance range of about 0.5 dex, although a range in age may also affect the RGB width. For the first time, a HB has been revealed at V~23.8. The HB is predominantly red yet moderately extended to the blue, which indicates the presence of a significant population with age comparable to that of old halo GGCs. This HB morphology in a metal-poor system indicates a mild "second parameter" effect. From the mean level of the HB we derived a true distance modulus 23.21+/-0.08, in good agreement with the distance modulus 23.04+/-0.07 estimated from the cutoff of the RGB at I~23.1. We find a radial gradient in the HB morphology, and our CMDs show a small number of stars above the RGB tip, that most likely are AGB stars of an intermediate age population. Their number indicates that the fraction of intermediate age population in Phoenix is approximately 30-40%. A young stellar population is definitely present in Phoenix, consistent with a star formation episode started at least 0.6 Gyr ago, up to 1x10^{8} yr ago. Both young stars and AGB stars are centrally concentrated, which indicates that recent star formation preferentially occurred in the inner galaxy regions. In many respects, Phoenix appears not dissimilar from dwarf spheroidal galaxies in the Local Group.

  20. Effects of tone on the three-way laryngeal distinction in Korean: An acoustic and aerodynamic comparison of the Seoul and South Kyungsang dialects

    E-Print Network [OSTI]

    Lee, Hyunjung; Jongman, Allard

    2012-08-01

    The three-way laryngeal distinction among voiceless Korean stops has been well documented for the Seoul dialect. The present study compares the acoustic and aerodynamic properties of this stop series between two dialects, non-tonal Seoul and tonal...

  1. Potential of the tractor-trailer and container segments as entry markets for a proposed refrigeration technology

    SciTech Connect (OSTI)

    Smith, S.A.; Davis, L.J.; Garrett, B.A.

    1987-05-01

    The refrigerated trailer and container segments of the transportation industry are evaluated as potential entry markets for a proposed absorption refrigeration technology. To perform this analysis the existing transportation refrigeration industry is characterized; this includes a description of the current refrigeration technology, rating systems, equipment manufacturers, maintenance requirements, and sales trends. This information indicates that the current transportation refrigeration industry is composed of two major competitors, Thermo King and Carrier. In addition, it has low profit potential, some barriers to entry and low growth potential. Data are also presented that characterize the transportation refrigeration consumers, specifically, major groups, market segmentation, consumer decision process, and buying criteria. This consumer information indicates that the majority of refrigerated trailer consumers are private carriers, and that the majority of refrigerated container consumers are shipping companies. Also, these consumers are primarily interested in buying reliable equipment at a low price, and are quite satisfied with existing refrigeration equipment.

  2. 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

    2007-01-04

    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.

  3. Inter-slice bidirectional registration-based segmentation of the prostate gland in MR and CT image sequences

    SciTech Connect (OSTI)

    Khalvati, Farzad Tizhoosh, Hamid R.; Salmanpour, Aryan; Rahnamayan, Shahryar; Rodrigues, George

    2013-12-15

    Purpose: Accurate segmentation and volume estimation of the prostate gland in magnetic resonance (MR) and computed tomography (CT) images are necessary steps in diagnosis, treatment, and monitoring of prostate cancer. This paper presents an algorithm for the prostate gland volume estimation based on the semiautomated segmentation of individual slices in T2-weighted MR and CT image sequences. Methods: The proposedInter-Slice Bidirectional Registration-based Segmentation (iBRS) algorithm relies on interslice image registration of volume data to segment the prostate gland without the use of an anatomical atlas. It requires the user to mark only three slices in a given volume dataset, i.e., the first, middle, and last slices. Next, the proposed algorithm uses a registration algorithm to autosegment the remaining slices. We conducted comprehensive experiments to measure the performance of the proposed algorithm using three registration methods (i.e., rigid, affine, and nonrigid techniques). Results: The results with the proposed technique were compared with manual marking using prostate MR and CT images from 117 patients. Manual marking was performed by an expert user for all 117 patients. The median accuracies for individual slices measured using the Dice similarity coefficient (DSC) were 92% and 91% for MR and CT images, respectively. The iBRS algorithm was also evaluated regarding user variability, which confirmed that the algorithm was robust to interuser variability when marking the prostate gland. Conclusions: The proposed algorithm exploits the interslice data redundancy of the images in a volume dataset of MR and CT images and eliminates the need for an atlas, minimizing the computational cost while producing highly accurate results which are robust to interuser variability.

  4. A segmented multi-loop antenna for selective excitation of azimuthal mode number in a helicon plasma source

    SciTech Connect (OSTI)

    Shinohara, S.; Tanikawa, T.; Motomura, T.

    2014-09-15

    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.

  5. Application of modern-control-design methodologies to a multi-segmented deformable-mirror system. Master's thesis

    SciTech Connect (OSTI)

    Vaughan, E.M.

    1991-05-23

    The multi-segmented deformable mirror system is proposed as an element for a portion of a ballistic missile defense system. The size of the mirror required for this defense function requires that the mirror be developed in segments, and then these segments should be phased together to produce one continuous, large optic. The application of multivariable control system synthesis techniques to provide closed-loop wavefront control of the deformable mirror system is the problem discussed in this thesis. The method of H at infinity control system synthesis using loop-shaping techniques was used to develop a controller that meets a robust performance specification. The number and location of sensors was treated as a design variable, and the structured singular value (mu) was used to determine the performance robustness of the deformable mirror system. Decentralized control issues are also addressed through the use of necessary conditions in an effort to determine a suitable decentralized control structure with performance similar to that of the centralized controller.

  6. Improving Healthcare for Populations: Building Smart and Integrated Remote Health Monitoring Systems

    E-Print Network [OSTI]

    Alshurafa, Nabil

    2015-01-01

    for Populations: Building Smart and Integrated Remote Healthfor Populations: Building Smart and Integrated Remote Health

  7. Section title Distinctly Global

    E-Print Network [OSTI]

    Glasbey, Chris

    significant research opportunities for the Institute of Petroleum Engineering and across our Built Environment, created through a partnership with the British Geological Survey, begins construction in January 2015. We

  8. Section title Distinctly Global

    E-Print Network [OSTI]

    Glasbey, Chris

    Court of Heriot-Watt University 39 Consolidated Income and Expenditure Account 41 Consolidated Statement grant income to £26.9 million, some £1.1 million higher than target. We have diversified and broadened our research income sources to include a wider range of Research Councils, augmented the average size

  9. Clinical Utility of the Modified Segmental Boost Technique for Treatment of the Pelvis and Inguinal Nodes

    SciTech Connect (OSTI)

    Moran, M.S.; Castrucci, W.A.; Ahmad, M.; Song, H.; Lund, M.W.; Mani, S.; Chamberlain, Daniel; Higgins, S.A.

    2010-03-15

    Purpose: Low-lying pelvic malignancies often require simultaneous radiation to pelvis and inguinal nodes. We previously reported improved homogeneity with the modified segmental boost technique (MSBT) compared to that with traditional methods, using phantom models. Here we report our institutional clinical experience with MSBT. Methods and Materials: MSBT patients from May 2001 to March 2007 were evaluated. Parameters analyzed included isocenter/multileaf collimation shifts, time per fraction (four fields), monitor units (MU)/fraction, femoral doses, maximal dose relative to body mass index, and inguinal node depth. In addition, a dosimetric comparison of the MSBT versus intensity modulated radiation therapy (IMRT) was conducted. Results: Of the 37 MSBT patients identified, 32 were evaluable. Port film adjustments were required in 6% of films. Median values for each analyzed parameter were as follows: MU/fraction, 298 (range, 226-348); delivery time, 4 minutes; inguinal depth, 4.5 cm; volume receiving 45 Gy (V45), 7%; V27.5, 87%; body mass index, 25 (range, 16.0-33.8). Inguinal dose was 100% in all cases; in-field inhomogeneity ranged from 111% to 118%. IMRT resulted in significantly decreased dose to normal tissue but required more time for treatment planning and a higher number of MUs (1,184 vs. 313 MU). Conclusions: In our clinical experience, the mono-isocentric MSBT provides a high degree of accuracy, improved homogeneity compared with traditional techniques, ease of simulation, treatment planning, treatment delivery, and acceptable femoral doses for pelvic/inguinal radiation fields requiring 45 to 50.4 Gy. In addition, the MSBT delivers a relatively uniform dose distribution throughout the treatment volume, despite varying body habitus. Clinical scenarios for the use of MSBT vs. intensity-modulated radiation therapy are discussed. To our knowledge, this is the first study reporting the utility of MSBT in the clinical setting.

  10. Evaluation of atlas-based auto-segmentation software in prostate cancer patients

    SciTech Connect (OSTI)

    Greenham, Stuart; Dean, Jenna; Fu, Cheuk Kuen Kenneth; Goman, Joanne; Mulligan, Jeremy; Tune, Deanna; Sampson, David; Westhuyzen, Justin; McKay, Michael

    2014-09-15

    The performance and limitations of an atlas-based auto-segmentation software package (ABAS; Elekta Inc.) was evaluated using male pelvic anatomy as the area of interest. Contours from 10 prostate patients were selected to create atlases in ABAS. The contoured regions of interest were created manually to align with published guidelines and included the prostate, bladder, rectum, femoral heads and external patient contour. Twenty-four clinically treated prostate patients were auto-contoured using a randomised selection of two, four, six, eight or ten atlases. The concordance between the manually drawn and computer-generated contours were evaluated statistically using Pearson's product–moment correlation coefficient (r) and clinically in a validated qualitative evaluation. In the latter evaluation, six radiation therapists classified the degree of agreement for each structure using seven clinically appropriate categories. The ABAS software generated clinically acceptable contours for the bladder, rectum, femoral heads and external patient contour. For these structures, ABAS-generated volumes were highly correlated with ‘as treated’ volumes, manually drawn; for four atlases, for example, bladder r = 0.988 (P < 0.001), rectum r = 0.739 (P < 0.001) and left femoral head r = 0.560 (P < 0.001). Poorest results were seen for the prostate (r = 0.401, P < 0.05) (four atlases); however this was attributed to the comparison prostate volume being contoured on magnetic resonance imaging (MRI) rather than computed tomography (CT) data. For all structures, increasing the number of atlases did not consistently improve accuracy. ABAS-generated contours are clinically useful for a range of structures in the male pelvis. Clinically appropriate volumes were created, but editing of some contours was inevitably required. The ideal number of atlases to improve generated automatic contours is yet to be determined.

  11. Genetic diversity and population structure of disjunct Newfoundland and central Ontario

    E-Print Network [OSTI]

    Innes, David J.

    Genetic diversity and population structure of disjunct Newfoundland and central Ontario populations geographical range in Newfoundland for comparison with three populations from its central range in Ontario populations examined. The Newfoundland populations were as genetically variable as those from Ontario

  12. 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.

    2003-07-01

    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 ...

  13. Population dynamics and management of free-roaming cats 

    E-Print Network [OSTI]

    Hill, Paige McGee

    2006-08-16

    (Felis catus) populations. Thus, some information is repeated among chapters (i.e., problem definition, study area description). 3 CHAPTER II POPULATION DYNAMICS OF FREE-ROAMING CATS SYNOPSIS Free-roaming cats impact wildlife worldwide through...

  14. McGuire and Garfinkel: Archaeological Investigations in the Southern Sierra Nevada: The Bear Mountain Segment of the Pacific Crest Trail

    E-Print Network [OSTI]

    Moratto, Michael J

    1982-01-01

    along the 29-km. Bear Mountain segment of the Pacific CrestSierra Nevada: The Bear Mountain Seg- ment of the Pacifichistoric times. In the Bear Mountain vicinity, the Sierran

  15. Microphase separation in copolymers of hydrophilic PEG blocks and hydrophobic tyrosine-derived segments using simultaneous SAXS/WAXS/DSC

    SciTech Connect (OSTI)

    Murthy, N.S.; Wang, W.; Kohn, J. (Rutgers); (Vermont)

    2010-10-22

    Hydration- and temperature-induced microphase separations were investigated by simultaneous small- and wide-angle X-ray scattering (SAXS and WAXS) and differential scanning calorimetry (DSC) in a family of copolymers in which hydrophilic poly(ethylene glycol) (PEG) blocks are inserted randomly into a hydrophobic polymer made of either desaminotyrosyl-tyrosine ethyl ester (DTE) or iodinated I{sub 2}DTE segments. Iodination of the tyrosine rings in I{sub 2}DTE increased the X-ray contrast between the hydrophobic and hydrophilic segments in addition to facilitating the study of the effect of iodination on microphase separation. The formation of phase-separated, hydrated PEG domains is of considerable significance as it profoundly affects the polymer properties. The copolymers of DTE (or I{sub 2}DTE) and PEG are a useful model system, and the findings presented here may be applicable to other PEG-containing random copolymers. In copolymers of PEG and DTE and I{sub 2}DTE, the presence of PEG depressed the glass transition temperature (T{sub g}) of the copolymer relative to the homopolymer, poly(DTE carbonate), and the DTE/I{sub 2}DTE segments hindered the crystallization of the PEG segments. In the dry state, at large PEG fractions (>70 vol%), the PEG domains self-assembled into an ordered structure with 14-18 nm distance between the domains. These domains gave rise to a SAXS peak at all temperatures in the iodinated polymers, but only above the T{sub g} in non-iodinated polymers, due to the unexpected contrast-match between the crystalline PEG domains and the glassy DTE segments. Irrespective of whether PEG was crystalline or not, immersion of these copolymers in water resulted in the formation of hydrated PEG domains that were 10-20 nm apart. Since both water and the polymer chains must be mobile for the phase separation to occur, the PEG domains disappeared when the water froze, and reappeared as the ice began to melt. This transformation was reversible, and showed hysteresis as did the melting of ice and freezing of the water incorporated into the polymer. PEG-water complexes and PEG-water eutectics were observed in WAXS and DSC scans, respectively.

  16. Size Dependent Population Dynamics of Microtus Ochrogaster

    E-Print Network [OSTI]

    Sauer, John R.; Slade, Norman A.

    1986-06-01

    stream_size 20190 stream_content_type text/plain stream_name slade_american_naturalist.pdf.txt stream_source_info slade_american_naturalist.pdf.txt Content-Encoding UTF-8 Content-Type text/plain; charset=UTF-8 Vol. 127... therefore could make no direct comparison of age- and mass-based methods (such as the analysis in Werner and Caswell 1977 of a population of teasel, Dipsacus sylvestris Huds.). Subsequent to our analysis of voles, we com­ pared age- and mass...

  17. RESEARCH ARTICLE Population structure, dispersal and colonization history

    E-Print Network [OSTI]

    the population structure of the bumblebee Bombus hortorum in a model island system, the Western Isles of Scotland

  18. 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

    2007-01-04

    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.

  19. The reionization of galactic satellite populations

    SciTech Connect (OSTI)

    Ocvirk, P.; Gillet, N.; Aubert, D.; Chardin, J. [Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS UMR 7550, 11 rue de l'Université, F-67000 Strasbourg (France); Knebe, A.; Yepes, G. [Grupo de Astrofísica, Departamento de Fisica Teorica, Modulo C-8, Universidad Autónoma de Madrid, Cantoblanco E-280049 (Spain); Libeskind, N.; Gottlöber, S. [Leibniz-Institute für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam (Germany); Hoffman, Y. [Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel)

    2014-10-10

    We use high-resolution simulations of the formation of the local group, post-processed by a radiative transfer code for UV photons, to investigate the reionization of the satellite populations of an isolated Milky Way-M31 galaxy pair in a variety of scenarios. We use an improved version of ATON which includes a simple recipe for radiative feedback. In our baseline models, reionization is initiated by low-mass, radiatively regulated halos at high redshift, until more massive halos appear, which then dominate and complete the reionization process. We investigate the relation between reionization history and present-day positions of the satellite population. We find that the average reionization redshift (z {sub r}) of satellites is higher near galaxy centers (MW and M31). This is due to the inside out reionization patterns imprinted by massive halos within the progenitor during the epoch of reionization, which end up forming the center of the galaxy. Due to incomplete dynamical mixing during galaxy assembly, these early patterns survive to present day, resulting in a clear radial gradient in the average satellite reionization redshift, up to the virial radius of MW and M31 and beyond. In the lowest emissivity scenario, the outer satellites are reionized about 180 Myr later than the inner satellites. This delay decreases with increasing source model emissivity, or in the case of external reionization by Virgo or M31, because reionization occurs faster overall and becomes spatially quasi-uniform at the highest emissivity.

  20. TCRs Used in Cancer Gene Therapy Cross-React with MART-1/Melan-A Tumor Antigens via Distinct Mechanisms

    SciTech Connect (OSTI)

    Borbulevych, Oleg Y.; Santhanagopolan, Sujatha M.; Hossain, Moushumi; Baker, Brian M. (Notre)

    2013-09-18

    T cells engineered to express TCRs specific for tumor Ags can drive cancer regression. The first TCRs used in cancer gene therapy, DMF4 and DMF5, recognize two structurally distinct peptide epitopes of the melanoma-associated MART-1/Melan-A protein, both presented by the class I MHC protein HLA-A*0201. To help understand the mechanisms of TCR cross-reactivity and provide a foundation for the further development of immunotherapy, we determined the crystallographic structures of DMF4 and DMF5 in complex with both of the MART-1/Melan-A epitopes. The two TCRs use different mechanisms to accommodate the two ligands. Although DMF4 binds the two with a different orientation, altering its position over the peptide/MHC, DMF5 binds them both identically. The simpler mode of cross-reactivity by DMF5 is associated with higher affinity toward both ligands, consistent with the superior functional avidity of DMF5. More generally, the observation of two diverging mechanisms of cross-reactivity with the same Ags and the finding that TCR-binding orientation can be determined by peptide alone extend our understanding of the mechanisms underlying TCR cross-reactivity.

  1. The protein tyrosine phosphatases PTPRZ and PTPRG bind to distinct members of the contactin family of neural recognition molecules

    SciTech Connect (OSTI)

    Bouyain, Samuel; Watkins, Dara J. (UMKC)

    2010-04-05

    The receptor protein tyrosine phosphatases gamma (PTPRG) and zeta (PTPRZ) are expressed primarily in the nervous system and mediate cell adhesion and signaling events during development. We report here the crystal structures of the carbonic anhydrase-like domains of PTPRZ and PTPRG and show that these domains interact directly with the second and third immunoglobulin repeats of the members of the contactin (CNTN) family of neural recognition molecules. Interestingly, these receptors exhibit distinct specificities: PTPRZ binds only to CNTN1, whereas PTPRG interacts with CNTN3, 4, 5, and 6. Furthermore, we present crystal structures of the four N-terminal immunoglobulin repeats of mouse CNTN4 both alone and in complex with the carbonic anhydrase-like domain of mouse PTPRG. In these structures, the N-terminal region of CNTN4 adopts a horseshoe-like conformation found also in CNTN2 and most likely in all CNTNs. This restrained conformation of the second and third immunoglobulin domains creates a binding site that is conserved among CNTN3, 4, 5, and 6. This site contacts a discrete region of PTPRG composed primarily of an extended {beta}-hairpin loop found in both PTPRG and PTPRZ. Overall, these findings implicate PTPRG, PTPRZ and CNTNs as a group of receptors and ligands involved in the manifold recognition events that underlie the construction of neural networks.

  2. Distinctive plume formation in atmospheric Ar and He plasmas in microwave frequency band and suitability for biomedical applications

    SciTech Connect (OSTI)

    Lee, H. Wk.; Kang, S. K.; Won, I. H.; Kim, H. Y.; Kwon, H. C.; Sim, J. Y.; Lee, J. K.

    2013-12-15

    Distinctive discharge formation in atmospheric Ar and He plasmas was observed in the microwave frequency band using coaxial transmission line resonators. Ar plasmas formed a plasma plume whereas He formed only confined plasmas. As the frequency increased from 0.9 GHz to 2.45 GHz, the Ar plasma exhibited contraction and filamentation, and the He plasmas were constricted. Various powers and gas flow rates were applied to identify the effect of the electric field and gas flow rate on plasma plume formation. The He plasmas were more strongly affected by the electric field than the Ar plasmas. The breakdown and sustain powers yielded opposite results from those for low-frequency plasmas (?kHz). The phenomena could be explained by a change in the dominant ionization process with increasing frequency. Penning ionization and the contribution of secondary electrons in sheath region reduced as the frequency increased, leading to less efficient ionization of He because its ionization and excitation energies are higher than those of Ar. The emission spectra showed an increase in the NO and N{sub 2} second positive band in both the Ar and He plasmas with increasing frequency whereas the hydroxyl radical and atomic O peaks did not increase with increasing frequency but were highest at particular frequencies. Further, the frequency effect of properties such as the plasma impedance, electron density, and device efficiency were presented. The study is expected to be helpful for determining the optimal conditions of plasma systems for biomedical applications.

  3. 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.

    2010-09-21

    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.

  4. A Population Model for the Academic Ecosystem

    E-Print Network [OSTI]

    Wu, Yan; Chiu, Dah Ming

    2015-01-01

    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.

  5. Old stellar populations in distant radio galaxies

    E-Print Network [OSTI]

    James Dunlop

    1998-01-13

    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.

  6. Automated fibroglandular tissue segmentation and volumetric density estimation in breast MRI using an atlas-aided fuzzy C-means method

    SciTech Connect (OSTI)

    Wu, Shandong; Weinstein, Susan P.; Conant, Emily F.; Kontos, Despina

    2013-12-15

    Purpose: Breast magnetic resonance imaging (MRI) plays an important role in the clinical management of breast cancer. Studies suggest that the relative amount of fibroglandular (i.e., dense) tissue in the breast as quantified in MR images can be predictive of the risk for developing breast cancer, especially for high-risk women. Automated segmentation of the fibroglandular tissue and volumetric density estimation in breast MRI could therefore be useful for breast cancer risk assessment. Methods: In this work the authors develop and validate a fully automated segmentation algorithm, namely, an atlas-aided fuzzy C-means (FCM-Atlas) method, to estimate the volumetric amount of fibroglandular tissue in breast MRI. The FCM-Atlas is a 2D segmentation method working on a slice-by-slice basis. FCM clustering is first applied to the intensity space of each 2D MR slice to produce an initial voxelwise likelihood map of fibroglandular tissue. Then a prior learned fibroglandular tissue likelihood atlas is incorporated to refine the initial FCM likelihood map to achieve enhanced segmentation, from which the absolute volume of the fibroglandular tissue (|FGT|) and the relative amount (i.e., percentage) of the |FGT| relative to the whole breast volume (FGT%) are computed. The authors' method is evaluated by a representative dataset of 60 3D bilateral breast MRI scans (120 breasts) that span the full breast density range of the American College of Radiology Breast Imaging Reporting and Data System. The automated segmentation is compared to manual segmentation obtained by two experienced breast imaging radiologists. Segmentation performance is assessed by linear regression, Pearson's correlation coefficients, Student's pairedt-test, and Dice's similarity coefficients (DSC). Results: The inter-reader correlation is 0.97 for FGT% and 0.95 for |FGT|. When compared to the average of the two readers’ manual segmentation, the proposed FCM-Atlas method achieves a correlation ofr = 0.92 for FGT% and r = 0.93 for |FGT|, and the automated segmentation is not statistically significantly different (p = 0.46 for FGT% and p = 0.55 for |FGT|). The bilateral correlation between left breasts and right breasts for the FGT% is 0.94, 0.92, and 0.95 for reader 1, reader 2, and the FCM-Atlas, respectively; likewise, for the |FGT|, it is 0.92, 0.92, and 0.93, respectively. For the spatial segmentation agreement, the automated algorithm achieves a DSC of 0.69 ± 0.1 when compared to reader 1 and 0.61 ± 0.1 for reader 2, respectively, while the DSC between the two readers’ manual segmentation is 0.67 ± 0.15. Additional robustness analysis shows that the segmentation performance of the authors' method is stable both with respect to selecting different cases and to varying the number of cases needed to construct the prior probability atlas. The authors' results also show that the proposed FCM-Atlas method outperforms the commonly used two-cluster FCM-alone method. The authors' method runs at ?5 min for each 3D bilateral MR scan (56 slices) for computing the FGT% and |FGT|, compared to ?55 min needed for manual segmentation for the same purpose. Conclusions: The authors' method achieves robust segmentation and can serve as an efficient tool for processing large clinical datasets for quantifying the fibroglandular tissue content in breast MRI. It holds a great potential to support clinical applications in the future including breast cancer risk assessment.

  7. Special population planner, version 4.0.

    SciTech Connect (OSTI)

    Kuiper, J.; Tanzman, E.; Metz, W.

    2007-03-26

    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

  8. The Stellar Populations of NGC 3109: Another Dwarf Irregular Galaxy with a Population II Stellar Halo

    E-Print Network [OSTI]

    Dante Minniti; Albert Zijlstra; M. Victoria Alonso

    1998-10-29

    We have obtained V and I-band photometry for about 17500 stars in the field of the dwarf irregular galaxy NGC3109, located in the outskirts of the Local Group. The photometry allows us to study the stellar populations present inside and outside the disk of this galaxy. From the VI color-magnitude diagram we infer metallicities and ages for the stellar populations in the main body and in the halo of NGC3109. The stars in the disk of this galaxy have a wide variety of ages, including very young stars with approximately 10^7 yr. Our main result is to establish the presence of a halo consisting of population II stars, extending out to about 4.5 arcmin (or 1.8 kpc) above and below the plane of this galaxy. For these old stars we derive an age of > 10 Gyr and a metallicity of [Fe/H] = -1.8 +/- 0.2. We construct a deep luminosity function, obtaining an accurate distance modulus (m-M)_0 = 25.62 +/- 0.1 for this galaxy based on the I-magnitude of the red giant branch (RGB) tip and adopting E(V-I) = 0.05.

  9. Simulated population responses of common carp to commercial exploitation

    SciTech Connect (OSTI)

    Weber, Michael J.; Hennen, Matthew J.; Brown, Michael L.

    2011-12-01

    Common carp Cyprinus carpio is a widespread invasive species that can become highly abundant and impose deleterious ecosystem effects. Thus, aquatic resource managers are interested in controlling common carp populations. Control of invasive common carp populations is difficult, due in part to the inherent uncertainty of how populations respond to exploitation. To understand how common carp populations respond to exploitation, we evaluated common carp population dynamics (recruitment, growth, and mortality) in three natural lakes in eastern South Dakota. Common carp exhibited similar population dynamics across these three systems that were characterized by consistent recruitment (ages 3 to 15 years present), fast growth (K = 0.37 to 0.59), and low mortality (A = 1 to 7%). We then modeled the effects of commercial exploitation on size structure, abundance, and egg production to determine its utility as a management tool to control populations. All three populations responded similarly to exploitation simulations with a 575-mm length restriction, representing commercial gear selectivity. Simulated common carp size structure modestly declined (9 to 37%) in all simulations. Abundance of common carp declined dramatically (28 to 56%) at low levels of exploitation (0 to 20%) but exploitation >40% had little additive effect and populations were only reduced by 49 to 79% despite high exploitation (>90%). Maximum lifetime egg production was reduced from 77 to 89% at a moderate level of exploitation (40%), indicating the potential for recruitment overfishing. Exploitation further reduced common carp size structure, abundance, and egg production when simulations were not size selective. Our results provide insights to how common carp populations may respond to exploitation. Although commercial exploitation may be able to partially control populations, an integrated removal approach that removes all sizes of common carp has a greater chance of controlling population abundance and reducing perturbations induced by this invasive species.

  10. Magnetic Fields in Population III Star Formation

    SciTech Connect (OSTI)

    Turk, Matthew J.; Oishi, Jeffrey S.; Abel, Tom; Bryan, Greg

    2012-02-22

    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.

  11. Distinct Fermi Surface Topology and Nodeless Superconducting Gap in a Tl0:58Rb0:42Fe1:72Se2 Superconductor

    E-Print Network [OSTI]

    Tian, Weidong

    -based superconductors reported so far. The Fermi surface around the M point shows a nearly isotropic superconducting gap) superconductors [6]. It is important to explore whether the high-Tc superconductiv- ity mechanism in this new FeDistinct Fermi Surface Topology and Nodeless Superconducting Gap in a ðTl0:58Rb0:42ÞFe1:72Se2

  12. Distinction between the Poole-Frenkel and tunneling models of electric-field-stimulated carrier emission from deep levels in semiconductors

    E-Print Network [OSTI]

    Ganichev, Sergey

    Distinction between the Poole-Frenkel and tunneling models of electric-field-stimulated carrier of the defects. However, only a limited number of defects can be satisfac- torily described by the Poole-Frenkel theory. An electric field dependence different from that expected from the Poole-Frenkel theory has been

  13. 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

  14. 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

  15. 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

  16. Visualizing Diurnal Population Change in Urban Areas for Emergency Management

    SciTech Connect (OSTI)

    Kobayashi, Tetsuo; Medina, Richard M; Cova, Thomas

    2011-01-01

    There is an increasing need for a quick, simple method to represent diurnal population change in metropolitan areas for effective emergency management and risk analysis. Many geographic studies rely on decennial U.S. Census data that assume that urban populations are static in space and time. This has obvious limitations in the context of dynamic geographic problems. The U.S. Department of Transportation publishes population data at the transportation analysis zone level in fifteen-minute increments. This level of spatial and temporal detail allows for improved dynamic population modeling. This article presents a methodology for visualizing and analyzing diurnal population change for metropolitan areas based on this readily available data. Areal interpolation within a geographic information system is used to create twenty-four (one per hour) population surfaces for the larger metropolitan area of Salt Lake County, Utah. The resulting surfaces represent diurnal population change for an average workday and are easily combined to produce an animation that illustrates population dynamics throughout the day. A case study of using the method to visualize population distributions in an emergency management context is provided using two scenarios: a chemical release and a dirty bomb in Salt Lake County. This methodology can be used to address a wide variety of problems in emergency management.

  17. The Other 15%: Expanding Energy Efficiency to Rural Populations

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

    Populations September 10, 2015 Call Slides and Discussion Summary Agenda Call Logistics and Opening Poll Residential Network and Peer Exchange Call Overview ...

  18. Population estimates for Phase 1: Hanford Environmental Dose Reconstruction Project

    SciTech Connect (OSTI)

    Beck, D.M.; Erickson, A.R.; Harkreader, S.A.

    1992-03-01

    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.

  19. FITNESS AND DENSITY-DEPENDENT POPULATION GROWTH IN DROSOPHILA MELANOGASTER

    E-Print Network [OSTI]

    Mueller, Laurence D.

    viability (DOBZHANSKY,SPASSKYand TIDWELL1963), fecundity (MARINKOVIC1967), virility (BRITTNACHER1979), developmental rate (MARINKOVIC1967) and sperm displacement (PRQUTand BUNDGAARD1977). Population ecologists have

  20. 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

    2008-07-31

    (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.