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1

Gamma Log | Open Energy Information  

Open Energy Info (EERE)

Gamma Log Gamma Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Gamma Log Details Activities (6) Areas (6) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: provides information on changes in rock type near the wellbore from changes in measured gamma radiation Stratigraphic/Structural: using multiple gamma logs over an area, the depth to the sandstone and shale layers can be correlated over larger areas Hydrological: Thermal: Cost Information Low-End Estimate (USD): 0.2525 centUSD 2.5e-4 kUSD 2.5e-7 MUSD 2.5e-10 TUSD / foot Median Estimate (USD): 0.3838 centUSD

2

Definition: Gamma Log | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Gamma Log Jump to: navigation, search Dictionary.png Gamma Log Gamma logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other related purposes. Different types of rock emit different amounts and different spectra of natural gamma radiation.[1] View on Wikipedia Wikipedia Definition Gamma ray logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is a wireline logging method used in mining, mineral exploration,

3

Image Logs | Open Energy Information  

Open Energy Info (EERE)

Image Logs Image Logs Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Image Logs Details Activities (2) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: Identify different lithological layers, rock composition, grain size, mineral, and clay content Stratigraphic/Structural: -Fault and fracture identification -Rock texture, porosity, and stress analysis -determine dip, thickness, and geometry of rock strata in vicinity of borehole -Detection of permeable pathways, fracture zones, faults Hydrological: Locate zones of aquifer inflow/outflow Thermal:

4

Definition: Image Logs | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Image Logs Jump to: navigation, search Dictionary.png Image Logs Well logging techniques which create images of the inside of a borehole. A 360° view camera is used that can be lowered into a borehole via logging cable. The camera's purpose is to provide live images of the borehole walls. View on Wikipedia Wikipedia Definition Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole. The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs). Well logging can

5

Gamma Log At Coso Geothermal Area (1977) | Open Energy Information  

Open Energy Info (EERE)

Gamma Log At Coso Geothermal Area (1977) Gamma Log At Coso Geothermal Area (1977) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Gamma Log At Coso Geothermal Area (1977) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Gamma Log Activity Date 1977 Usefulness not indicated DOE-funding Unknown Notes extensive geophysical logging surveys were conducted: natural gamma and neutron porosity logs indicate gross rock type References Galbraith, R. M. (1 May 1978) Geological and geophysical analysis of Coso Geothermal Exploration Hole No. 1 (CGEH-1), Coso Hot Springs KGRA, California Goranson, C.; Schroeder, R. (1 June 1978) Static downhole characteristics of well CGEH-1 at Coso Hot Springs, China Lake, California Retrieved from "http://en.openei.org/w/index.php?title=Gamma_Log_At_Coso_Geothermal_Area_(1977)&oldid=510780"

6

Gamma-Ray Logging Workshop (February 1981)  

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

Borehole logging methods for exploration Borehole logging methods for exploration and evaluation o f uranium deposits . Philip H. O d d , Robert F. Bmullad and Carl P. Lathan rej~rinkttl fnlm Mining and Groundwater Geophysiall967 Borehole logging methods for exploration and evaluation of uranium deposits Philip H. Dodd, Robert F. Droullard and Carl P. Lathan US. Atomic Energy Commhwn GmrPd Jtinct&n, Colorado Abstract, M o l e 1 - i s thc geophysical methad mast exten&@ w r t i n the Udtrrd States for exploratio~ md edwtim of wanhi &pod&. dammow lop, C o r n r n d j suppkrnentd with a singbz-pobt msfstailee log, m t l y supply about 80 percent of the bask data for om regerve c W t i o R a d mu& of the w ~ k r 6 . p ~ &ngk inf~nnatio~ Tmck-mounted 'rotmy eqnipmcnt i s EMhmody emphy&& holes usually hwre a nominai b

7

Using search logs to recommend images to new users  

Science Journals Connector (OSTI)

We make use of search logs provided by the Belga News Agency to recommend images downloaded by previous users to new users. Each search session in the logs consists of a session ID number, the ID of the images which were downloaded at the conclusion ... Keywords: TF.IDF, cosine similarity coefficient, recommendation, relevance feedback, search engines, search logs, still images

Yan Xu; Michael Oakes

2009-09-01T23:59:59.000Z

8

COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO...  

Open Energy Info (EERE)

to permeability in the reservoir. Acoustic image logs reveal a similar natural fracture population, but generally image slightly fewer fractures, and do not reveal rock...

9

Formation Micro-Imager Logs (FMI) | Open Energy Information  

Open Energy Info (EERE)

Formation Micro-Imager Logs (FMI) Formation Micro-Imager Logs (FMI) Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Formation Micro-Imager Logs (FMI) Author Shakeel Ahmed Published Publisher Not Provided, 2013 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Formation Micro-Imager Logs (FMI) Citation Shakeel Ahmed. Formation Micro-Imager Logs (FMI) [Internet]. 2013. [cited 2013/10/09]. Available from: http://petphy.blogspot.com/2011/12/formation-micro-imager-logs-fmi.html Retrieved from "http://en.openei.org/w/index.php?title=Formation_Micro-Imager_Logs_(FMI)&oldid=687994" Categories: References Geothermal References Uncited References What links here Related changes Special pages Printable version Permanent link Browse properties

10

Gamma Log At Alum Area (Moos & Ronne, 2010) | Open Energy Information  

Open Energy Info (EERE)

Gamma Log At Alum Area (Moos & Ronne, 2010) Gamma Log At Alum Area (Moos & Ronne, 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Gamma Log At Alum Geothermal Area (Moos & Ronne, 2010) Exploration Activity Details Location Alum Geothermal Area Exploration Technique Gamma Log Activity Date Usefulness useful DOE-funding Unknown Notes Density, photo-electric factor (PEF), neutron, and gamma ray (GR) logs provided sufficient information to clearly delineate basement lithologic variations, suggesting that pulsed neutron logs may not in many cases be needed, References Daniel Moos, Joel Ronne (2010) Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Results From The Alum 25-29 Well, Nevada Retrieved from "http://en.openei.org/w/index.php?title=Gamma_Log_At_Alum_Area_(Moos_%26_Ronne,_2010)&oldid=510779"

11

Borehole Calibration Facilities to Support Gamma Logging for Hanford Subsurface Investigation and Contaminant Monitoring - 13516  

SciTech Connect (OSTI)

Repeated gamma logging in cased holes represents a cost-effective means to monitor gamma-emitting contamination in the deep vadose zone over time. Careful calibration and standardization of gamma log results are required to track changes and to compare results over time from different detectors and logging systems. This paper provides a summary description of Hanford facilities currently available for calibration of logging equipment. Ideally, all logging organizations conducting borehole gamma measurements at the Hanford Site will take advantage of these facilities to produce standardized and comparable results. (authors)

McCain, R.G.; Henwood, P.D.; Pope, A.D.; Pearson, A.W. [S M Stoller Corporation, 2439 Robertson Drive, Richland, WA 99354 (United States)] [S M Stoller Corporation, 2439 Robertson Drive, Richland, WA 99354 (United States)

2013-07-01T23:59:59.000Z

12

Image Logs At Coso Geothermal Area (2011) | Open Energy Information  

Open Energy Info (EERE)

Image Logs At Coso Geothermal Area (2011) Image Logs At Coso Geothermal Area (2011) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Image Logs At Coso Geothermal Area (2011) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Image Logs Activity Date 2011 Usefulness useful DOE-funding Unknown Exploration Basis Determine crustul stress heterogeneity Notes Borehole induced structures in image logs of wells from the Coso Geothermal Field (CGF) record variation in the azimuth of principal stress. Image logs of these structures from five wells were analyzed to quantify the stress heterogeneity for three geologically distinct locations: two wells within the CGF (one in an actively produced volume), two on the margin of the CGF and outside the production area, and a control well several tens of km

13

Micro-Conductivity Imager Logging Tool | Open Energy Information  

Open Energy Info (EERE)

Micro-Conductivity Imager Logging Tool Micro-Conductivity Imager Logging Tool Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Micro-Conductivity Imager Logging Tool Author Hemisphere Technologies Published Publisher Not Provided, 2011 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Micro-Conductivity Imager Logging Tool Citation Hemisphere Technologies. Micro-Conductivity Imager Logging Tool [Internet]. 2011. [cited 2013/10/09]. Available from: http://www.hemisphereoil.com/mcit.html Retrieved from "http://en.openei.org/w/index.php?title=Micro-Conductivity_Imager_Logging_Tool&oldid=687995" Categories: References Geothermal References Uncited References What links here Related changes Special pages Printable version Permanent link

14

Image Logs At Coso Geothermal Area (2004) | Open Energy Information  

Open Energy Info (EERE)

Logs At Coso Geothermal Area (2004) Logs At Coso Geothermal Area (2004) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Image Logs At Coso Geothermal Area (2004) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Image Logs Activity Date 2004 Usefulness not indicated DOE-funding Unknown Exploration Basis EGS potential of Coso Geothermal Region Notes During the second year of this project, wellbore logs and stress data were acquired in a new production well drilled in the Coso Geothermal Field, 38C-9. The image analysis results include the discrimination of natural from drilling induced fractures in wellbore image data, natural fracture characterization, and wellbore failure analysis References Sheridan, J.; Hickman, S.H. (1 January 2004) IN SITU STRESS,

15

Grade Assignments for Models Used for Calibration of Gross-Count Gamma-Ray Logging Systems (December 1983)  

Broader source: Energy.gov [DOE]

Grade Assignments for Models Used for Calibration of Gross-Count Gamma-Ray Logging Systems (December 1983)

16

Gamma Log At Raft River Geothermal Area (1979) | Open Energy Information  

Open Energy Info (EERE)

Gamma Log At Raft River Geothermal Area (1979) Gamma Log At Raft River Geothermal Area (1979) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Gamma Log At Raft River Geothermal Area (1979) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Gamma Log Activity Date 1979 Usefulness useful DOE-funding Unknown Exploration Basis To allow for the lateral and vertical extrapolation of core and test data and bridged the gap between surface geophysical data and core analyses. Notes Borehole gamma spectrometry can be used to identify anomalous concentration of uranium, thorium, and potassium which are probably due to transportation by hydrothermal solutions. Computer crossplotting was used as an aid to the identification of such rock types as quartzite, quartz monzonite, and

17

Gamma Log At Fort Bliss Area (Combs, Et Al., 1999) | Open Energy  

Open Energy Info (EERE)

Fort Bliss Area (Combs, Et Al., 1999) Fort Bliss Area (Combs, Et Al., 1999) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Gamma Log At Fort Bliss Area (Combs, Et Al., 1999) Exploration Activity Details Location Fort Bliss Area Exploration Technique Gamma Log Activity Date Usefulness not indicated DOE-funding Unknown Notes Three principal types of data were obtained from this drilling project: core samples of the lithology penetrated by the holes, records of drilling behavior (such as water level in the hole, changes in rate of penetration etc.), and multiple temperature logs (both during and after drilling) in each well. A suite of geophysical logs (gamma ray, neutron, sonic, and resistivity) was also run after completion of drilling. References Jim Combs, John T. Finger, Colin Goranson, Charles E. Hockox Jr.,

18

Gamma-ray Imaging Methods  

SciTech Connect (OSTI)

In this document we discuss specific implementations for gamma-ray imaging instruments including the principle of operation and describe systems which have been built and demonstrated as well as systems currently under development. There are several fundamentally different technologies each with specific operational requirements and performance trade offs. We provide an overview of the different gamma-ray imaging techniques and briefly discuss challenges and limitations associated with each modality (in the appendix we give detailed descriptions of specific implementations for many of these technologies). In Section 3 we summarize the performance and operational aspects in tabular form as an aid for comparing technologies and mapping technologies to potential applications.

Vetter, K; Mihailescu, L; Nelson, K; Valentine, J; Wright, D

2006-10-05T23:59:59.000Z

19

Analysis of historical gross gamma logging data from BY tank farm  

SciTech Connect (OSTI)

Gross gamma ray logs, recorded from January 1975 through mid-year 1994 as part of the Single-Shell Tank Farm Dry Well Surveillance Program, have been reanalyzed for the BY tank farm to locate the presence of mobile radionuclides in the subsurface. This report presents the BY tank farm gross gamma ray data in such a way as to assist others in their study of vadose zone mechanisms.

MYERS, D.A.

1999-10-13T23:59:59.000Z

20

Analysis of historical gross gamma logging data from BX tank farm  

SciTech Connect (OSTI)

Gross gamma ray logs, recorded from January 1975 through mid-year 1994 as part of the Single-Shell Tank Farm Dry Well Surveillance Program, have been reanalyzed for the BX tank farm to locate the presence of mobile radionuclides in the subsurface. This report presents the BX tank farm gross gamma ray data in such a way as to assist others in their study of vadose zone mechanism.

MYERS, D.A.

1999-10-12T23:59:59.000Z

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


21

Category:Well Log Techniques | Open Energy Information  

Open Energy Info (EERE)

Category Category Edit History Facebook icon Twitter icon » Category:Well Log Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermalpower.jpg Looking for the Well Log Techniques page? For detailed information on Well Log Techniques as exploration techniques, click here. Category:Well Log Techniques Add.png Add a new Well Log Techniques Technique Pages in category "Well Log Techniques" The following 17 pages are in this category, out of 17 total. A Acoustic Logs C Caliper Log Cement Bond Log Chemical Logging Cross-Dipole Acoustic Log D Density Log F FMI Log G Gamma Log I Image Logs M Mud Logging N Neutron Log P Pressure Temperature Log R Resistivity Log Resistivity Tomography S Single-Well and Cross-Well Resistivity Spontaneous Potential Well Log Stoneley Analysis

22

Calibration facilities at Hanford for gamma-ray and fission-neutron well logging  

SciTech Connect (OSTI)

Well-logging tools that detect gamma rays emitted from earth formations need to be calibrated in appropriate facilities to provide quantitative assessments of concentrations o radionuclides based on detected gamma rays. These facilities are typically special models having a hole to insert tools and having sufficient physical size to simulate actual earth formations containing known amounts of radionuclides. The size, generally 3 to 5 feet in diameter and 4 to 6 feet tall, is such that the source of radiation appears infinite in extent to a tool detecting the radiation inside the model. Such models exist at Hanford as concrete cylinders having a central borehole and containing known, enhanced amounts of K, U, and Th. Data collected in these models allow calibration of the logging system to measure radionuclide concentrations in formations around boreholes in the field. The accuracy of the calculated field concentrations depends on the correctness of the original calibration, the statistical precision of the data, and the similarity of the logging conditions to the calibration conditions. Possible methods for analyzing the data collected in the calibration facilities are presented for both spectral and total-count gamma-ray systems. Corrections are typically needed for the effects of steel casing in boreholes and the presence of water rather than air in the holes. Data collected in the calibration models with various steel casings and borehole fluids allow such correction factors to be determined.

Stromswold, D.C.

1994-07-01T23:59:59.000Z

23

A Brief Review of the Basis for, and the Procedures Currently Utilized in, Gross Gamma-Ray Log Calibration (October 1976)  

Broader source: Energy.gov [DOE]

A Brief Review of the Basis for, and the Procedures Currently Utilized in, Gross Gamma-Ray Log Calibration (October 1976)

24

Search Log Analysis of the ARTstor Cultural Heritage Image Database  

E-Print Network [OSTI]

Image downloaded Advanced search Records when an image ispages Records when an advanced search function is used The

Lowe, Heather Ann

2013-01-01T23:59:59.000Z

25

Interpretation of Pennsylvania Bartlesville sandstone in southeastern Kansas and northeastern Oklahoma from continuous dipmeter and gamma-ray logs  

E-Print Network [OSTI]

INTERPRETATION OF PENNSYLVANIAN BARTLESVILLE SANDSTONE IN SOUTHEASTERN KANSAS AND NORTHEASTERN OKLAHOMA FROM CONTINUOUS DIPMETER AND GAMMA-RAY LOGS A Thesis by DWIGHT STANLEY KRANZ Submitted to the Graduate College of Texas A&M University... in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1981 Major Subject: Geology INTERPRETATION OF PENNSYLVANIAN SARTLESVILLE SANDSTONE IN SOUTHEASTERN KANSAS AND NORTHEASTERN OKLAHOMA FROM CONTINUOUS DIPMETER AND GAMMA...

Kranz, Dwight Stanley

2012-06-07T23:59:59.000Z

26

COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA Details Activities (1) Areas (1) Regions (0) Abstract: Electrical and acoustic image logs collected from well 58A-10 in crystalline rock on the eastern margin of the Coso Geothermal Field, CA, reveal different populations of planar structures intersecting the borehole. Electrical image logs appear to be sensitive to variations in

27

Gamma Ray Imaging for Environmental Remediation  

SciTech Connect (OSTI)

This program is the development of germanium strip detectors for environmental remediation. It is a collaboration between the Naval Research Laboratory and Lawrence Berkeley National Lab. The goal is to develop detectors that are simultaneously capable of excellent spectroscopy and imaging of gamma radiation.

B.F. Philips; R.A. Kroeger: J.D. Kurfess: W.N. Johnson; E.A. Wulf; E. I. Novikova

2004-11-12T23:59:59.000Z

28

Temperatures and Natural Gamma-Ray Logs Obtained in 1986 from...  

Open Energy Info (EERE)

Changes in temperature logs run in July and September appear to result from fluid loss to the formation during and following drilling and possibly to ground shaking...

29

Geothermal Well Logging: Geological Wireline Logs and Fracture...  

Open Energy Info (EERE)

Logging: Geological Wireline Logs and Fracture Imaging Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Geothermal Well Logging: Geological...

30

Processing dipole acoustic logging data to image fracture network in shale gas reservoirs  

Science Journals Connector (OSTI)

A recent advance in borehole remote acoustic reflection imaging is the utilization of a dipole acoustic system in a borehole to emit and receive elastic waves to and from a remote geologic reflector in formation. An important application of this new technique is the delineation of fracture network in shale gas reservoirs as interest and activities in shale gas exploration increase in China. We develop a data processing procedure and implement it to handle routine processing of dipole acoustic logging data. The procedure takes into account the characteristics of the dipole data such as frequency dispersion attenuation recording length and dipole source orientation etc. to obtain an image of reflectors within 20~30 meters around the borehole. We have applied the technique to process dipole acoustic data from several wells drilled into gas reservoirs in China. The obtained images clearly identify major fracture network in the gas producing intervals of the reservoir demonstrating the effectiveness of the imaging technique.

Zhuang Chunxi; Su Yuanda; Tang Xiaoming

2012-01-01T23:59:59.000Z

31

Automatic image analysis for detecting and quantifying gamma-ray sources in coded-aperture images  

SciTech Connect (OSTI)

The authors report the development of an automatic image analysis system that detects gamma-ray source regions in images obtained from a coded aperture, gamma-ray imager. The number of gamma sources in the image is not known prior to analysis. The system counts the number (K) of gamma sources detected in the image and estimates the lower bound for the probability that the number of sources in the image is K. The system consists of a two-stage pattern classification scheme in which the probabilistic neural network is used in the supervised learning mode. The algorithms were developed and tested using real gamma-ray images from controlled experiments in which the number and location of depleted uranium source disks in the scene are known. The novelty of the work lies in the creative combination of algorithms and the successful application of the algorithms to real images of gamma-ray sources.

Schaich, P.C.; Sengupta, S.K.; Ziock, K.P. [Lawrence Livermore National Lab., CA (United States)] [Lawrence Livermore National Lab., CA (United States); Clark, G.A. [Lawrence Livermore National Lab., CA (United States)] [Lawrence Livermore National Lab., CA (United States); [Univ. of California, Davis, CA (United States). Center for Image Processing and Integrated Computing

1996-08-01T23:59:59.000Z

32

IN-SITU ASSAY OF TRANSURANIC RADIONUCLIDES IN THE VADOSE ZONE USING HIGH-RESOLUTION SPECTRAL GAMMA LOGGING - A HANFORD CASE STUDY  

SciTech Connect (OSTI)

High-resolution spectral gamma logging in steel-cased boreholes is used to detect and quantify transuranic radionuclides in the subsurface. Pu-239, Pu-241, Am-241, and Np-237 are identified based on characteristic decay gammas. Typical minimum detectable levels are on the order of 20 to 40 nCi/g. In intervals of high transuranic concentrations, gamma rays from other sources may complicate analysis and interpretation. Gamma rays detected in the borehole may originate from three sources: decay of the parent transuranic radionuclide or a daughter; alpha interactions; and interactions with neutrons resulting from either spontaneous fission or alpha particle interactions.

ROHAY VJ; HENWOOD P; MCCAIN R

2009-11-30T23:59:59.000Z

33

E-Print Network 3.0 - atmospheric gamma-ray imaging Sample Search...  

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

gamma-ray imaging Search Powered by Explorit Topic List Advanced Search Sample search results for: atmospheric gamma-ray imaging Page: << < 1 2 3 4 5 > >> 1 Ivan De Mitri VHE Gamma...

34

Gamma-ray imaging with coaxial HPGe detector  

SciTech Connect (OSTI)

We report on the first experimental demonstration of Compton imaging of gamma rays with a single coaxial high-purity germanium (HPGe) detector. This imaging capability is realized by two-dimensional segmentation of the outside contact in combination with digital pulse-shape analysis, which enables to image gamma rays in 4{pi} without employing a collimator. We are able to demonstrate the ability to image the 662keV gamma ray from a {sup 137}Cs source with preliminary event selection with an angular accuracy of 5 degree with an relative efficiency of 0.2%. In addition to the 4{pi} imaging capability, such a system is characterized by its excellent energy resolution and can be implemented in any size possible for Ge detectors to achieve high efficiency.

Niedermayr, T; Vetter, K; Mihailescu, L; Schmid, G J; Beckedahl, D; Kammeraad, J; Blair, J

2005-04-12T23:59:59.000Z

35

Electric Micro Imager Log At Coso Geothermal Area (2003) | Open Energy  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Electric Micro Imager Log At Coso Geothermal Area (2003) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Single-Well and Cross-Well Resistivity At Coso Geothermal Area (2003) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Single-Well and Cross-Well Resistivity Activity Date 2003 Usefulness not indicated DOE-funding Unknown Exploration Basis Fracture/stress analysis Notes A preliminary fracture/stress analysis was conducted for the recently drilled well 38C-9 as part of a continuing effort to characterize the

36

Geophysical logs from water wells in the Yakima area, Washington  

SciTech Connect (OSTI)

The logs include: natural gamma, gamma gamma, neutron neutron, neutron gamma, caliper, fluid temperature, fluid resistivity, wall resistivity, spontaneous potential, and flow meter.

Biggane, J.H.

1983-01-01T23:59:59.000Z

37

ARTICLE IN PRESS YJNTH:3811 Please cite this article in press as: S. Gun et al., Transcendence of the log gamma function and some discrete periods, J.  

E-Print Network [OSTI]

ARTICLE IN PRESS YJNTH:3811 Please cite this article in press as: S. Gun et al., Transcendence.elsevier.com/locate/jnt Transcendence of the log gamma function and some discrete periods Sanoli Gun 1,2 , M. Ram Murty ,3 , Purusottam-mail addresses: sanoli@imsc.res.in (S. Gun), murty@mast.queensu.ca (M.R. Murty), rath@cmi.ac.in (P. Rath). 1

Murty, Ram

38

Gamma-Ray Imaging with the Coded Mask IBIS Telescope  

E-Print Network [OSTI]

The IBIS telescope onboard INTEGRAL, the ESA gamma-ray space mission to be launched in 2002, is a soft gamma-ray (20 keV - 10 MeV) device based on a coded aperture imaging system. We describe here basic concepts of coded masks, the imaging system of the IBIS telescope, and the standard data analysis procedures to reconstruct sky images. This analysis includes, for both the low-energy detector layer (ISGRI) and the high energy layer (PICSIT), iterative procedures which decode recorded shadowgrams, search for and locate sources, clean for secondary lobes, and then rotate and compose sky images. These procedures will be implemented in the Quick Look and Standard Analysis of the INTEGRAL Science Data Center (ISDC) as IBIS Instrument Specific Software.

Goldwurm, A; Gros, A; Stephen, J; Foschini, L; Gianotti, F; Natalucci, L; De Cesare, G; Santo, M D

2000-01-01T23:59:59.000Z

39

Image Artifacts Resulting from Gamma-Ray Tracking Algorithms Used with Compton Imagers  

SciTech Connect (OSTI)

For Compton imaging it is necessary to determine the sequence of gamma-ray interactions in a single detector or array of detectors. This can be done by time-of-flight measurements if the interactions are sufficiently far apart. However, in small detectors the time between interactions can be too small to measure, and other means of gamma-ray sequencing must be used. In this work, several popular sequencing algorithms are reviewed for sequences with two observed events and three or more observed events in the detector. These algorithms can result in poor imaging resolution and introduce artifacts in the backprojection images. The effects of gamma-ray tracking algorithms on Compton imaging are explored in the context of the 4? Compton imager built by the University of Michigan.

Seifert, Carolyn E.; He, Zhong

2005-10-01T23:59:59.000Z

40

Imaging system for cardiac planar imaging using a dedicated dual-head gamma camera  

DOE Patents [OSTI]

A cardiac imaging system employing dual gamma imaging heads co-registered with one another to provide two dynamic simultaneous views of the heart sector of a patient torso. A first gamma imaging head is positioned in a first orientation with respect to the heart sector and a second gamma imaging head is positioned in a second orientation with respect to the heart sector. An adjustment arrangement is capable of adjusting the distance between the separate imaging heads and the angle between the heads. With the angle between the imaging heads set to 180 degrees and operating in a range of 140-159 keV and at a rate of up to 500kHz, the imaging heads are co-registered to produce simultaneous dynamic recording of two stereotactic views of the heart. The use of co-registered imaging heads maximizes the uniformity of detection sensitivity of blood flow in and around the heart over the whole heart volume and minimizes radiation absorption effects. A normalization/image fusion technique is implemented pixel-by-corresponding pixel to increase signal for any cardiac region viewed in two images obtained from the two opposed detector heads for the same time bin. The imaging system is capable of producing enhanced first pass studies, bloodpool studies including planar, gated and non-gated EKG studies, planar EKG perfusion studies, and planar hot spot imaging.

Majewski, Stanislaw (Morgantown, VA); Umeno, Marc M. (Woodinville, WA)

2011-09-13T23:59:59.000Z

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


41

Fiber fed x-ray/gamma ray imaging apparatus  

DOE Patents [OSTI]

X-ray/gamma ray imaging apparatus is disclosed for detecting the position, energy, and intensity of x-ray/gamma ray radiation comprising scintillation means disposed in the path of such radiation and capable of generating photons in response to such radiation; first photodetection means optically bonded to the scintillation means and capable of generating an electrical signal indicative of the intensity, and energy of the radiation detected by the scintillation means; second photodetection means capable of generating an electrical signal indicative of the position of the radiation in the radiation pattern; and means for optically coupling the scintillation means to the second photodetection means. The photodetection means are electrically connected to control and storage means which may also be used to screen out noise by rejecting a signal from one photodetection means not synchronized to a signal from the other photodetection means; and also to screen out signals from scattered radiation.

Hailey, Charles J. (San Francisco, CA); Ziock, Klaus-Peter (Livermore, CA)

1992-01-01T23:59:59.000Z

42

Computer vision for detecting and quantifying gamma-ray sources in coded-aperture images  

SciTech Connect (OSTI)

The authors report the development of an automatic image analysis system that detects gamma-ray source regions in images obtained from a coded aperture, gamma-ray imager. The number of gamma sources in the image is not known prior to analysis. The system counts the number (K) of gamma sources detected in the image and estimates the lower bound for the probability that the number of sources in the image is K. The system consists of a two-stage pattern classification scheme in which the Probabilistic Neural Network is used in the supervised learning mode. The algorithms were developed and tested using real gamma-ray images from controlled experiments in which the number and location of depleted uranium source disks in the scene are known.

Schaich, P.C.; Clark, G.A.; Sengupta, S.K.; Ziock, K.P.

1994-11-02T23:59:59.000Z

43

E-Print Network 3.0 - advanced gamma-ray imaging Sample Search...  

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

Powered by Explorit Topic List Advanced Search Sample search results for: advanced gamma-ray imaging Page: << < 1 2 3 4 5 > >> 1 BazookaSPECT: A Low-Cost Approach to...

44

Gamma-ray imaging with a rotating hexagonal uniformly redundant array  

SciTech Connect (OSTI)

Laboratory experiments have been performed to demonstrate the capabilities of a ..gamma..-ray imaging system employing a NaI Anger camera and a rotating coded aperture mask. The mask incorporates in its design a new type of hexagonal uniformly redundant array (HURA) which is essentially antisymmetric under 60/sup 0/ rotation. The image formation techniques are described and results are presented that demonstrate the imaging capability of the system for individual and multiple point sources of ..gamma..-ray emission. The results are compared to analytical predictions for the imaging and point source localization capabilities of coded aperture systems using continuous detectors.

Cook, W.R.; Finger, M.; Prince, T.A.; Stone, E.C.

1984-02-01T23:59:59.000Z

45

Change Log  

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

Change Log Change Log Change Log NERSC-8 / Trinity Benchmarks Change Log 09/03/2013 Correction applied to MiniDFT web-page (to remove inconsistency with MiniDFT README). Capability Improvement measurements do not require 10,000 MPI ranks per k-point. 08/06/2013 Various pages have changed to remove "draft" status 08/02/2013 Correction added to FLOP Counts for "Small" Single-Node Miniapplication Tests page 07/12/2013 README files updated for IOR benchmark to correct an error in wording (no code changes); README file updated for osu-micro-benchmarks (OMB) changing the tests required and conditions including reinserting some tests that had been deleted earlier 07/05/2013 README updated for mpimemu benchmark; Revised version of benchmark results spreadsheet (linked on SSP web page);

46

Rotting Logs  

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

55 March 2, 1946 55 March 2, 1946 Forest Preserve District of Cook County Clayton F. Smith, President Roberts Mann, Superintendent of Conservation ROTTING LOGS There is drama in a rotting log. Apparently lifeless and useless there on the ground, it harbors thousands of living things within and beneath it. Feeding on the wood of the log, living and dying, generation after generation of them, they convert it back into minerals which a fertile healthy forest soil must have. They also add the humus which not only helps the soil to hold its moisture but also aids in making the soil minerals usable as food by plants, including trees. Finally there is nothing left but crumbling punk shot through and through with the hyphae, or roots, of molds and mushrooms. Some of the common lower plant and animal forms found in a rotting log in our forest preserves are these.

47

Coded aperture imaging system optimized for hard x-ray and gamma ray astronomy  

SciTech Connect (OSTI)

A coded aperture imaging system has been designed for the Gamma-Ray Imaging Spectrometer (GRIS). The system is optimized for imaging 511-keV positron-annihilation photons. For a galactic center 511-keV source strength of 10/sup -3/ cm/sup -2/s/sup -1/, the source location accuracy is expected to be +-0.2/sup 0/.

Gehrels, N.; Cline, T.L.; Huters, A.F.; Leventhal, M.; MacCallum, C.J.; Reber, J.D.; Stang, P.D.; Teegarden, B.J.; Tueller, J.

1985-01-01T23:59:59.000Z

48

Gamma electron vertex imaging and application to beam range verification in proton therapy  

SciTech Connect (OSTI)

Purpose: This paper describes a new gamma-ray imaging method, ''gamma electron vertex imaging (GEVI)'', which can be used for precise beam range verification in proton therapy. Methods: In GEVI imaging, the high-energy gammas from a source or nuclear interactions are first converted, by Compton scattering, to electrons, which subsequently are traced by hodoscopes to determine the location of the gamma source or the vertices of the nuclear interactions. The performance of GEVI imaging for use in-beam range verification was evaluated by Monte Carlo simulations employing geant4 equipped with the QGSP{sub B}IC{sub H}P physics package. Results: Our simulation results show that GEVI imaging can determine the proton beam range very accurately, within 2-3 mm of error, even without any sophisticated analysis. The results were obtained under simplified conditions of monoenergetic pencil beams stopped in a homogeneous phantom and on the basis of the obtained results it is expected to achieve submillimeter accuracy in proton beam range measurement. Conclusions: If future experimental work confirms the simulated results presented in this paper, the use of GEVI imaging is expected to have a great potential in increasing the accuracy of proton beam range verification in a patient, resulting in significant improvement of treatment effectiveness by enabling tight conformation of radiation dose to the tumor volume and patient safety.

Hyeong Kim, Chan; Hyung Park, Jin; Seo, Hee; Rim Lee, Han [Department of Nuclear Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791 (Korea, Republic of)

2012-02-15T23:59:59.000Z

49

Log Summarization  

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

Log Log Summarization and Anomaly Detection for Troubleshooting Distributed Systems Dan Gunter #1 , Brian L. Tierney #2 , Aaron Brown ∗3 , Martin Swany ∗4 , John Bresnahan !5 , Jennifer M. Schopf !6 # Lawrence Berkeley National Laboratory, Berkeley, CA, USA 1 dkgunter@lbl.gov 2 bltierney@lbl.gov ∗ University of Delaware, Newark, DE, USA 3 brown@cis.udel.edu 4 swany@cis.udel.edu ! Argonne National Laboratory, Argonne, IL, USA 5 bresnaha@mcs.anl.gov 6 jms@mcs.anl.gov Abstract- Today's system monitoring tools are capable of detecting system failures such as host failures, OS errors, and network partitions in near-real time. Unfortunately, the same cannot yet be said of the end-to-end distributed software stack. Any given action, for example, reliably transferring a directory of files, can involve a wide range of complex and interrelated actions across multiple pieces

50

High spatial resolution X-ray and gamma ray imaging system using diffraction crystals  

DOE Patents [OSTI]

A method and a device for high spatial resolution imaging of a plurality of sources of x-ray and gamma-ray radiation are provided. The device comprises a plurality of arrays, with each array comprising a plurality of elements comprising a first collimator, a diffracting crystal, a second collimator, and a detector.

Smither, Robert K. (Hinsdale, IL)

2011-05-17T23:59:59.000Z

51

Noise Equivalent Counts Based Emission Image Reconstruction Algorithm of Tomographic Gamma Scanning  

E-Print Network [OSTI]

Tomographic Gamma Scanning (TGS) is a technique used to assay the nuclide distribution and radioactivity in nuclear waste drums. Both transmission and emission scans are performed in TGS and the transmission image is used for the attenuation correction in emission reconstructions. The error of the transmission image, which is not considered by the existing reconstruction algorithms, negatively affects the final results. An emission reconstruction method based on Noise Equivalent Counts (NEC) is presented. Noises from the attenuation image are concentrated to the projection data to apply the NEC Maximum-Likelihood Expectation-Maximization algorithm. Experiments are performed to verify the effectiveness of the proposed method.

Wang, Ke; Feng, Wei; Han, Dong

2014-01-01T23:59:59.000Z

52

Noise Equivalent Counts Based Emission Image Reconstruction Algorithm of Tomographic Gamma Scanning  

E-Print Network [OSTI]

Tomographic Gamma Scanning (TGS) is a technique used to assay the nuclide distribution and radioactivity in nuclear waste drums. Both transmission and emission scans are performed in TGS and the transmission image is used for the attenuation correction in emission reconstructions. The error of the transmission image, which is not considered by the existing reconstruction algorithms, negatively affects the final results. An emission reconstruction method based on Noise Equivalent Counts (NEC) is presented. Noises from the attenuation image are concentrated to the projection data to apply the NEC Maximum-Likelihood Expectation-Maximization algorithm. Experiments are performed to verify the effectiveness of the proposed method.

Ke Wang; Zheng Li; Wei Feng; Dong Han

2014-04-17T23:59:59.000Z

53

High-resolution single photon planar and spect imaging of brain and neck employing a system of two co-registered opposed gamma imaging heads  

DOE Patents [OSTI]

A compact, mobile, dedicated SPECT brain imager that can be easily moved to the patient to provide in-situ imaging, especially when the patient cannot be moved to the Nuclear Medicine imaging center. As a result of the widespread availability of single photon labeled biomarkers, the SPECT brain imager can be used in many locations, including remote locations away from medical centers. The SPECT imager improves the detection of gamma emission from the patient's head and neck area with a large field of view. Two identical lightweight gamma imaging detector heads are mounted to a rotating gantry and precisely mechanically co-registered to each other at 180 degrees. A unique imaging algorithm combines the co-registered images from the detector heads and provides several SPECT tomographic reconstructions of the imaged object thereby improving the diagnostic quality especially in the case of imaging requiring higher spatial resolution and sensitivity at the same time.

Majewski, Stanislaw (Yorktown, VA); Proffitt, James (Newport News, VA)

2011-12-06T23:59:59.000Z

54

Hybrid collimation for industrial gamma-ray imaging  

SciTech Connect (OSTI)

Portable photon imaging devices with a broad energy range of sensitivity, adequate angular resolution, and high efficiency are useful in applications such as environmental remediation and industrial surveys. The vast majority of past systems built for these applications have relied on mechanical collimation although a few have used electronic collimation. To the authors' knowledge, no devices have been built that exploit the benefits of both mechanical and electronic collimation in the same system. The combination of a mechanically collimated camera with an electronically collimated camera offers both the high efficiency and good angular resolution typical in a mechanically collimated camera for lower energies and the uncoupling of spatial resolution and efficiency provided by an electronically collimated camera at higher energies.

Smith, L.E.; He, Z.; Knoll, G.F.; Wehe, D.K.

1999-07-01T23:59:59.000Z

55

COMPACT CdZnTe-BASED GAMMA CAMERA FOR PROSTATE CANCER IMAGING  

SciTech Connect (OSTI)

In this paper, we discuss the design of a compact gamma camera for high-resolution prostate cancer imaging using Cadmium Zinc Telluride (CdZnTe or CZT) radiation detectors. Prostate cancer is a common disease in men. Nowadays, a blood test measuring the level of prostate specific antigen (PSA) is widely used for screening for the disease in males over 50, followed by (ultrasound) imaging-guided biopsy. However, PSA tests have a high false-positive rate and ultrasound-guided biopsy has a high likelihood of missing small cancerous tissues. Commercial methods of nuclear medical imaging, e.g. PET and SPECT, can functionally image the organs, and potentially find cancer tissues at early stages, but their applications in diagnosing prostate cancer has been limited by the smallness of the prostate gland and the long working distance between the organ and the detectors comprising these imaging systems. CZT is a semiconductor material with wide band-gap and relatively high electron mobility, and thus can operate at room temperature without additional cooling. CZT detectors are photon-electron direct-conversion devices, thus offering high energy-resolution in detecting gamma rays, enabling energy-resolved imaging, and reducing the background of Compton-scattering events. In addition, CZT material has high stopping power for gamma rays; for medical imaging, a few-mm-thick CZT material provides adequate detection efficiency for many SPECT radiotracers. Because of these advantages, CZT detectors are becoming popular for several SPECT medical-imaging applications. Most recently, we designed a compact gamma camera using CZT detectors coupled to an application-specific-integrated-circuit (ASIC). This camera functions as a trans-rectal probe to image the prostate gland from a distance of only 1-5 cm, thus offering higher detection efficiency and higher spatial resolution. Hence, it potentially can detect prostate cancers at their early stages. The performance tests of this camera have been completed. The results show better than 6-mm resolution at a distance of 1 cm. Details of the test results are discussed in this paper.

CUI, Y.; LALL, T.; TSUI, B.; YU, J.; MAHLER, G.; BOLOTNIKOV, A.; VASKA, P.; DeGERONIMO, G.; O'CONNOR, P.; MEINKEN, G.; JOYAL, J.; BARRETT, J.; CAMARDA, G.; HOSSAIN, A.; KIM, K.H.; YANG, G.; POMPER, M.; CHO, S.; WEISMAN, K.; SEO, Y.; BABICH, J.; LaFRANCE, N.; AND JAMES, R.B.

2011-10-23T23:59:59.000Z

56

Rotting Logs  

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

441-A January 22, 1972 441-A January 22, 1972 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation ROTTING LOGS Trees are like people. They die from diseases, infections, injuries, burns, drowning, malnutrition, and sometimes just plain old age. Walking through the woods we see, here and there, dead or dying trees of various kinds. For example: a big white oak, with its bark ripped from crown to root, was literally cooked by a bolt of lightning during a summer thunderstorm. In a grove of black oaks, many are dying lingering deaths from infected wounds started years ago when an autumn fire swept through the fallen leaves and scorched the living wood. In a dense forest there are many that have lost the battle for space and sunlight. In some places we see trees that are slowly starving because dashing rains have carried away the fertile topsoil and the trampling feet of picnickers have injured the shallow roots that bring them food.

57

Scientific Goals and Instrument Performance of the Gamma-Ray Imaging Detector AGILE  

E-Print Network [OSTI]

in the 10­40 keV energy band, and the CsI Mini- Calorimeter (MCAL) which is part of the GRID but will also capabilities, see Fig. 1: the AGILE Gamma-Ray Imaging Detector (GRID), sensitive in the 30 MeV - 50 GeV energy provide spectral and accurate timing information on transient events independently of the GRID. The GRID

58

Tomographic image of prompt gamma ray from boron neutron capture therapy: A Monte Carlo simulation study  

SciTech Connect (OSTI)

Purpose of paper is to confirm the feasibility of acquisition of three dimensional single photon emission computed tomography image from boron neutron capture therapy using Monte Carlo simulation. Prompt gamma ray (478?keV) was used to reconstruct image with ordered subsets expectation maximization method. From analysis of receiver operating characteristic curve, area under curve values of three boron regions were 0.738, 0.623, and 0.817. The differences between length of centers of two boron regions and distance of maximum count points were 0.3?cm, 1.6?cm, and 1.4?cm.

Yoon, Do-Kun; Jung, Joo-Young; Suk Suh, Tae, E-mail: suhsanta@catholic.ac.kr [Department of Biomedical Engineering and Research Institute of Biomedical Engineering, College of Medicine, Catholic University of Korea, Seoul 505 (Korea, Republic of); Jo Hong, Key [Molecular Imaging Program at Stanford (MIPS), Department of Radiology, Stanford University, 300 Pasteur Drive, Stanford, California 94305 (United States)

2014-02-24T23:59:59.000Z

59

High resolution x-ray and gamma ray imaging using diffraction lenses with mechanically bent crystals  

DOE Patents [OSTI]

A method for high spatial resolution imaging of a plurality of sources of x-ray and gamma-ray radiation is provided. High quality mechanically bent diffracting crystals of 0.1 mm radial width are used for focusing the radiation and directing the radiation to an array of detectors which is used for analyzing their addition to collect data as to the location of the source of radiation. A computer is used for converting the data to an image. The invention also provides for the use of a multi-component high resolution detector array and for narrow source and detector apertures.

Smither, Robert K. (Hinsdale, IL)

2008-12-23T23:59:59.000Z

60

Characteristic Count Rate Profiles for a Rotating Modulator Gamma-Ray Imager  

E-Print Network [OSTI]

Rotating modulation is a technique for indirect imaging in the hard x-ray and soft gamma-ray energy bands, which may offer an advantage over coded aperture imaging at high energies. A rotating modulator (RM) consists of a single mask of co-planar parallel slats typically spaced equidistance apart, suspended above an array of circular non-imaging detectors. The mask rotates, temporally modulating the transmitted image of the object scene. The measured count rate profiles of each detector are folded modulo the mask rotational period, and the object scene is reconstructed using pre-determined characteristic modulation profiles. The use of Monte Carlo simulation to derive the characteristic count rate profiles is accurate but computationally expensive; an analytic approach is preferred for its speed of computation. We present both the standard and a new advanced characteristic formula describing the modulation pattern of the RM; the latter is a more robust description of the instrument response developed as part ...

Budden, Brent S; Case, Gary L; Cherry, Michael L

2011-01-01T23:59:59.000Z

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


61

FMI Log | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » FMI Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: FMI Log Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Image Logs Information Provided by Technique Lithology: Identify different lithological layers, rock composition, mineral, and clay content Stratigraphic/Structural: -Fault and fracture identification -Rock texture, porosity, and stress analysis -determine dip and structural features in vicinity of borehole -Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water

62

The Advanced Gamma-ray Imaging System (AGIS) Telescope Optical System Designs  

SciTech Connect (OSTI)

AGIS is a conceptual design for a future ground-based gamma-ray observatory operating in the energy range 25 GeV-100 TeV, which is based on an array of {approx}20-100 imaging atmospheric Cherenkov telescopes (IACTs). The desired improvement in sensitivity, angular resolution, and reliability of operation of AGIS imposes demanding technological and cost requirements on the design of the IACTs. We are considering several options for the optical system (OS) of the AGIS telescopes, which include the traditional Davies-Cotton design as well as novel two-mirror design. Emerging mirror production technologies based on replication processes such as cold and hot glass slumping, cured carbon fiber reinforced plastic (CFRP), and electroforming provide new opportunities for cost-effective solutions for the design of the OS.

Bugaev, V.; Buckley, J.; Krawczynski, H. [Washington University (United States); Diegel, S.; Romani, R. [Stanford University (United States); Falcone, A. [Penn State University (United States); Fegan, S.; Vassiliev, V. [UCLA (United States); Finley, J. [Purdue University (United States); Guarino, V. [ANL (United States); Hanna, D. [McGill University (Canada); Kaaret, P. [University of Iowa (United States); Konopelko, A. [Pittsburg State University (United States); Ramsey, B. [MSFC (United States); Weekes, T. [CfA (United States)

2008-12-24T23:59:59.000Z

63

Logs / Meeting Minutes Index  

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

Logs / Meeting Minutes Logs / Meeting Minutes This page supplies links to the various logs and meeting minutes that are pertinent to the UES Group. FC Shift Log An ORACLE database tool used by the Floor Coordinators to record events that occur on the Experiment Hall Floor. FC Shift Log (Pubic View) Members of the APS Computer Network can use this link to view the FC Shift Log. MCR Shift Log An ORACLE database tool used by the MCR Operators to record events that occur relating to the operation of the Accelerating Systems. MCR Operator Message History The MCR Operator message for the past 72 hours are recorded for reference. UES Meeting Minutes The weekly User ESH Support group meeting minutes are recorded for reference. Also included are AOD-EOS and AOD-EFO meeting minutes. APS Radiation Safety PnP Committee Minutes

64

Logging-while-coring method and apparatus  

DOE Patents [OSTI]

A method and apparatus for downhole coring while receiving logging-while-drilling tool data. The apparatus includes core collar and a retrievable core barrel. The retrievable core barrel receives core from a borehole which is sent to the surface for analysis via wireline and latching tool The core collar includes logging-while-drilling tools for the simultaneous measurement of formation properties during the core excavation process. Examples of logging-while-drilling tools include nuclear sensors, resistivity sensors, gamma ray sensors, and bit resistivity sensors. The disclosed method allows for precise core-log depth calibration and core orientation within a single borehole, and without at pipe trip, providing both time saving and unique scientific advantages.

Goldberg, David S. (New York, NY); Myers, Gregory J. (Cornwall, NY)

2007-11-13T23:59:59.000Z

65

Acoustic Logs At Coso Geothermal Area (2005) | Open Energy Information  

Open Energy Info (EERE)

Coso Geothermal Area (2005) Coso Geothermal Area (2005) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Acoustic Logs Activity Date 2005 Usefulness not indicated DOE-funding Unknown Exploration Basis Well bore fracture analysis Notes Electrical and acoustic image logs have been collected from well 58A-10 in crystalline rock on the eastern margin. Electrical image logs appear to be sensitive to variations in mineralogy, porosity, and fluid content that highlight both natural fractures and rock fabrics. These fabric elements account for about 50% of the total population of planar structures seen in the electrical image log, but locally approach 100%. Acoustic image logs reveal a similar natural fracture population, but generally image slightly fewer fractures, and do not reveal rock fabric. Both logs also record

66

Process Deviation Log  

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

Process Deviation Log 09_0730 Process Deviation Log 09_0730 EOTA - Business Form Document Title: P-010, Process Deviation Process Document Number: Process Deviation Log EOTA Employees Melissa Otero N/A Referenced Documents: Parent Document: F-014 Rev. 11_0316 Approvers: Melissa Otero Document Owner: Elizabeth Sousa Backup Owner: Notify of Changes: A 09_0730 11_0316 Revision History: Rev. Description of Change Intitial Release. Revised log to reflect date/date range that PD is in effect. Removed drop-down menu items. Added ECD, Extension Date and Closed Column. F-014 Process Deviation Log 09_0730 Process Deviation # Date Requestor Departme nt Process # Has PD Occurred ? (Y/N) CAR/PAR # Distributio n Date Estimated Closure Date Extension Date Closed Date Comment PD-001 PD-002 PD-003 PD-004 PD-005 PD-006 PD-007 PD-008 PD-009

67

Design of Dual-Road Transportable Portal Monitoring System for Visible Light and Gamma-Ray Imaging  

SciTech Connect (OSTI)

The use of radiation sensors as portal monitors is increasing due to heightened concerns over the smuggling of fissile material. Transportable systems that can detect significant quantities of fissile material that might be present in vehicular traffic are of particular interest, especially if they can be rapidly deployed to different locations. To serve this application, we have constructed a rapid-deployment portal monitor that uses visible-light and gamma-ray imaging to allow simultaneous monitoring of multiple lanes of traffic from the side of a roadway. The system operation uses machine vision methods on the visible-light images to detect vehicles as they enter and exit the field of view and to measure their position in each frame. The visible-light and gamma-ray cameras are synchronized which allows the gamma-ray imager to harvest gamma-ray data specific to each vehicle, integrating its radiation signature for the entire time that it is in the field of view. Thus our system creates vehicle-specific radiation signatures and avoids source confusion problems that plague non-imaging approaches to the same problem. Our current prototype instrument was designed for measurement of upto five lanes of freeway traffic with a pair of instruments, one on either side of the roadway. Stereoscopic cameras are used with a third alignment camera for motion compensation and are mounted on a 50 deployable mast. In this paper we discuss the design considerations for the machine-vision system, the algorithms used for vehicle detection and position estimates, and the overall architecture of the system. We also discuss system calibration for rapid deployment. We conclude with notes on preliminary performance and deployment.

Karnowski, Thomas Paul [ORNL; Cunningham, Mark F [Lawrence Livermore National Laboratory (LLNL); Goddard Jr, James Samuel [ORNL; Cheriyadat, Anil M [ORNL; Hornback, Donald Eric [ORNL; Fabris, Lorenzo [ORNL; Kerekes, Ryan A [ORNL; Ziock, Klaus-Peter [ORNL; Bradley, Eric Craig [ORNL; Chesser, Joel B [ORNL; Marchant, William [University of California, Berkeley

2010-01-01T23:59:59.000Z

68

Abstract--We have recently completed a large-area, coded-aperture, gamma-ray imager for use in searching for radiation  

E-Print Network [OSTI]

Abstract-- We have recently completed a large-area, coded- aperture, gamma-ray imager for use. The in- strument uses a rank-19, one-dimensional coded aperture to cast shadow patterns onto a 0.57 m2 Na sufficient radiation can reach a large gamma-ray detec- tor from a small source to make detection possible

Horn, Berthold K.P.

69

3D printing in X-ray and gamma-ray imaging: A novel method for fabricating high-density imaging apertures  

Science Journals Connector (OSTI)

Advances in 3D rapid-prototyping printers, 3D modeling software, and casting techniques allow for cost-effective fabrication of custom components in gamma-ray and X-ray imaging systems. Applications extend to new fabrication methods for custom collimators, pinholes, calibration and resolution phantoms, mounting and shielding components, and imaging apertures. Details of the fabrication process for these components, specifically the 3D printing process, cold casting with a tungsten epoxy, and lost-wax casting in platinum are presented.

Brian W. Miller; Jared W. Moore; Harrison H. Barrett; Teresa Fry; Steven Adler; Joe Sery; Lars R. Furenlid

2011-01-01T23:59:59.000Z

70

Compton DIV: Using a Compton-Based Gamma-Ray Imager for Design Information Verification of Uranium Enrichment Plants  

SciTech Connect (OSTI)

A feasibility study has been performed to determine the potential usefulness of Compton imaging as a tool for design information verification (DIV) of uranium enrichment plants. Compton imaging is a method of gamma-ray imaging capable of imaging with a 360-degree field of view over a broad range of energies. These systems can image a room (with a time span on the order of one hour) and return a picture of the distribution and composition of radioactive material in that room. The effectiveness of Compton imaging depends on the sensitivity and resolution of the instrument as well the strength and energy of the radioactive material to be imaged. This study combined measurements and simulations to examine the specific issue of UF{sub 6} gas flow in pipes, at various enrichment levels, as well as hold-up resulting from the accumulation of enriched material in those pipes. It was found that current generation imagers could image pipes carrying UF{sub 6} in less than one hour at moderate to high enrichment. Pipes with low enriched gas would require more time. It was also found that hold-up was more amenable to this technique and could be imaged in gram quantities in a fraction of an hour. another questions arises regarding the ability to separately image two pipes spaced closely together. This depends on the capabilities of the instrument in question. These results are described in detail. In addition, suggestions are given as to how to develop Compton imaging as a tool for DIV.

Burks, M; Verbeke, J; Dougan, A; Wang, T; Decman, D

2009-07-04T23:59:59.000Z

71

openhole_logging.indd  

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

OPENHOLE LOGGING WELL OPENHOLE LOGGING WELL Objective R MOTC has drilled a mostly vertical well that is specifi cally designat- ed for openhole logging tests. It was drilled to 5,400 feet and has approximately 2,350 feet of open hole to test a variety of openhole logging tools. The wellbore is drilled with an 8-1/2" drill bit. The well was originally drilled with a 3% KCL Polymer mud system that seems to work well for stabilizing sensitive shale zones. The lower formations are very compact and should be able to stay open without signifi - cant caving. RMOTC has the capability to recondition this wellbore with a variety of mud types if needed. The openhole section will pass through a variety of ages, formations, and lithologies common to the Rocky Mountain geologic province. The rocks encoun-

72

Logging in to Franklin  

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

Logging in Logging in Logging in to Franklin Interactive Access You can log in to Franklin using SSH (Secure Shell) with the following command from any UNIX, Linux, FreeBSD, etc. command shell or terminal: % ssh -l username franklin.nersc.gov There are a number of SSH-capable clients available for Windows, Mac, and UNIX/Linux machines. NERSC does not support or recommend any particular client. Franklin has 10 login nodes; you will be randomly connected to one of those 10 when you ssh to franklin.nersc.gov. In all cases it will appear to you as if you are on "franklin.nersc.gov." The login nodes are where you compile codes, submit jobs, and view data. The login nodes on Franklin are directly connected to the internal high-speed "Seastar" network. Because of this you cannot login and work

73

Logging in to Hopper  

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

Logging in Logging in Logging in to Hopper Interactive Access You can log in to Hopper using SSH (Secure Shell) with the following command from any UNIX, Mac OS X, Linux, FreeBSD, etc. command shell or terminal: ssh -l username hopper.nersc.gov There are several SSH-capable clients available for Windows, Mac, and UNIX/Linux machines. NERSC does not support or recommend any particular client. Hopper has 12 login nodes. You will be randomly connected to one of those 12 when you ssh to hopper.nersc.gov. In all cases it will appear to you as if you are on "hopper.nersc.gov." The login nodes are where you compile codes, submit jobs, and view data. The login nodes on Hopper are "external," meaning they are not directly connected to Hopper's internal high-speed "Gemini" network. Because the

74

High energy resolution hard X-ray and gamma-ray imagers using CdTe diode devices  

E-Print Network [OSTI]

We developed CdTe double-sided strip detectors (DSDs or cross strip detectors) and evaluated their spectral and imaging performance for hard X-rays and gamma-rays. Though the double-sided strip configuration is suitable for imagers with a fine position resolution and a large detection area, CdTe diode DSDs with indium (In) anodes have yet to be realized due to the difficulty posed by the segmented In anodes. CdTe diode devices with aluminum (Al) anodes were recently established, followed by a CdTe device in which the Al anodes could be segmented into strips. We developed CdTe double-sided strip devices having Pt cathode strips and Al anode strips, and assembled prototype CdTe DSDs. These prototypes have a strip pitch of 400 micrometer. Signals from the strips are processed with analog ASICs (application specific integrated circuits). We have successfully performed gamma-ray imaging spectroscopy with a position resolution of 400 micrometer. Energy resolution of 1.8 keV (FWHM: full width at half maximum) was ob...

Watanabe, Shin; Aono, Hiroyuki; Takeda, Shin'ichiro; Odaka, Hirokazu; Kokubun, Motohide; Takahashi, Tadayuki; Nakazawa, Kazuhiro; Tajima, Hiroyasu; Onishi, Mitsunobu; Kuroda, Yoshikatsu

2008-01-01T23:59:59.000Z

75

NMR logging apparatus  

DOE Patents [OSTI]

Technologies including NMR logging apparatus and methods are disclosed. Example NMR logging apparatus may include surface instrumentation and one or more downhole probes configured to fit within an earth borehole. The surface instrumentation may comprise a power amplifier, which may be coupled to the downhole probes via one or more transmission lines, and a controller configured to cause the power amplifier to generate a NMR activating pulse or sequence of pulses. Impedance matching means may be configured to match an output impedance of the power amplifier through a transmission line to a load impedance of a downhole probe. Methods may include deploying the various elements of disclosed NMR logging apparatus and using the apparatus to perform NMR measurements.

Walsh, David O; Turner, Peter

2014-05-27T23:59:59.000Z

76

Chemical Logging | Open Energy Information  

Open Energy Info (EERE)

Chemical Logging Chemical Logging Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Chemical Logging Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Presence and geochemical composition of fluid producing zones Thermal: Calcium-alkalinity ratios versus depth assist in defining warm and hot water aquifers Dictionary.png Chemical Logging: Chemical logging produces a chemical profile of the formation fluid within a well based on the measurement of changes in the chemical composition of the drilling fluid during drilling operations.

77

Category:Neutron Log | Open Energy Information  

Open Energy Info (EERE)

Neutron Log page? For detailed information on Neutron Log, click here. Category:Neutron Log Add.png Add a new Neutron Log Technique Pages in category "Neutron Log" This category...

78

High energy resolution hard X-ray and gamma-ray imagers using CdTe diode devices  

E-Print Network [OSTI]

We developed CdTe double-sided strip detectors (DSDs or cross strip detectors) and evaluated their spectral and imaging performance for hard X-rays and gamma-rays. Though the double-sided strip configuration is suitable for imagers with a fine position resolution and a large detection area, CdTe diode DSDs with indium (In) anodes have yet to be realized due to the difficulty posed by the segmented In anodes. CdTe diode devices with aluminum (Al) anodes were recently established, followed by a CdTe device in which the Al anodes could be segmented into strips. We developed CdTe double-sided strip devices having Pt cathode strips and Al anode strips, and assembled prototype CdTe DSDs. These prototypes have a strip pitch of 400 micrometer. Signals from the strips are processed with analog ASICs (application specific integrated circuits). We have successfully performed gamma-ray imaging spectroscopy with a position resolution of 400 micrometer. Energy resolution of 1.8 keV (FWHM: full width at half maximum) was obtained at 59.54 keV. Moreover, the possibility of improved spectral performance by utilizing the energy information of both side strips was demonstrated. We designed and fabricated a new analog ASIC, VA32TA6, for the readout of semiconductor detectors, which is also suitable for DSDs. A new feature of the ASIC is its internal ADC function. We confirmed this function and good noise performance that reaches an equivalent noise charge of 110 e- under the condition of 3-4 pF input capacitance.

Shin Watanabe; Shin-nosuke Ishikawa; Hiroyuki Aono; Shin'ichiro Takeda; Hirokazu Odaka; Motohide Kokubun; Tadayuki Takahashi; Kazuhiro Nakazawa; Hiroyasu Tajima; Mitsunobu Onishi; Yoshikatsu Kuroda

2008-11-04T23:59:59.000Z

79

The Universe Viewed in Gamma-Rays 1 Development of an atmospheric Cherenkov imaging cam-  

E-Print Network [OSTI]

. The vessel is made of an aluminum alloy (A5052) in order to reduce the weight and provide sufficient rigidity of the project, aims at the detection for gamma-rays at energies of 0.1100 TeV (1TeV=1012 eV) using four 10-meter. The camera frame consists of two aluminum templates (5 mm in thickness), in which holes (21 mm in diameter

Enomoto, Ryoji

80

Active Detection and Imaging of Nuclear Materials with High-Brightness Gamma Rays  

SciTech Connect (OSTI)

A Compton scattering {gamma}-ray source, capable of producing photons with energies ranging from 0.1 MeV to 0.9 MeV has been commissioned and characterized, and then used to perform nuclear resonance fluorescence (NRF) experiments. The performances of the two laser systems (one for electron production, one for scattering), the electron photoinjector, and the linear accelerator are also detailed, and {gamma}-ray results are presented. The key source parameters are the size (0.01 mm{sup 2}), horizontal and vertical divergence (6 x 10 mrad{sup 2}), duration (10 ps), spectrum and intensity (10{sup 5} photons/shot). These parameters are summarized by the peak brightness, 1.5 x 10{sup 15} photons/mm{sup 2}/mrad{sup 2}/s/0.1% bandwidth, measured at 478 keV. Additional measurements of the flux as a function of the timing difference between the drive laser pulse and the relativistic photo-electron bunch, {gamma}-ray beam profile, and background evaluations are presented. These results are systematically compared to theoretical models and computer simulations. NRF measurements performed on {sup 7}Li in LiH demonstrate the potential of Compton scattering photon sources to accurately detect isotopes in situ.

Barty, C J; Gibson, D J; Albert, F; Anderson, S G; Anderson, G G; Betts, S M; Berry, R D; Fisher, S E; Hagmann, C A; Johnson, M S; Messerly, M J; Phan, H H; Semenov, V A; Shverdin, M Y; Tremaine, A M; Hartemann, F V; Siders, C W; McNabb, D P

2009-02-26T23:59:59.000Z

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


81

Neutron Log | Open Energy Information  

Open Energy Info (EERE)

Neutron Log Neutron Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Neutron Log Details Activities (4) Areas (4) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: if used in conjunction with other logs, this technique can provide information on the rock type and the porosity Stratigraphic/Structural: Corelation of rock units Hydrological: Estimate of formation porosity Thermal: Dictionary.png Neutron Log: The neutron log responds primarily to the amount of hydrogen in the formation which is contained in oil, natural gas, and water. The amount of hydrogen can be used to identify zones of higher porosity.

82

Grid Logging: Best Practices Guide  

SciTech Connect (OSTI)

The purpose of this document is to help developers of Grid middleware and application software generate log files that will be useful to Grid administrators, users, developers and Grid middleware itself. Currently, most of the currently generated log files are only useful to the author of the program. Good logging practices are instrumental to performance analysis, problem diagnosis, and security auditing tasks such as incident tracing and damage assessment. This document does not discuss the issue of a logging API. It is assumed that a standard log API such as syslog (C), log4j (Java), or logger (Python) is being used. Other custom logging API or even printf could be used. The key point is that the logs must contain the required information in the required format. At a high level of abstraction, the best practices for Grid logging are: (1) Consistently structured, typed, log events; (2) A standard high-resolution timestamp; (3) Use of logging levels and categories to separate logs by detail and purpose; (4) Consistent use of global and local identifiers; and (5) Use of some regular, newline-delimited ASCII text format. The rest of this document describes each of these recommendations in detail.

Tierney, Brian L; Tierney, Brian L; Gunter, Dan

2008-04-01T23:59:59.000Z

83

Neutron Log At Alum Area (Moos & Ronne, 2010) | Open Energy Information  

Open Energy Info (EERE)

Neutron Log At Alum Area (Moos & Ronne, 2010) Neutron Log At Alum Area (Moos & Ronne, 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Neutron Log At Alum Geothermal Area (Moos & Ronne, 2010) Exploration Activity Details Location Alum Geothermal Area Exploration Technique Neutron Log Activity Date Usefulness useful DOE-funding Unknown Notes Density, photo-electric factor (PEF), neutron, and gamma ray (GR) logs provided sufficient information to clearly delineate basement lithologic variations, suggesting that pulsed neutron logs may not in many cases be needed, References Daniel Moos, Joel Ronne (2010) Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Results From The Alum 25-29 Well, Nevada Retrieved from "http://en.openei.org/w/index.php?title=Neutron_Log_At_Alum_Area_(Moos_%26_Ronne,_2010)&oldid=511025"

84

Depth of Interaction Enhanced Gamma-Ray Imaging for Medical Applications  

E-Print Network [OSTI]

A novel design for an inexpensive depth of interaction capable detector for gamma rays, suitable for nuclear medical applications, especially Positron Emission Tomography, has been developed. The design takes advantage of the strong correlation between the width of the scintillation light distribution in continuous crystals and the depth of interaction of the gamma-ray. For measuring the distribution width, an inexpensive modification of the commonly used charge dividing circuits that allows analogue and instantaneous computation of the 2nd moment has been developed and is presented in this work. The method has been tested with a detector made of a continuous LSO-scintillator of dimensions 42x42x10 cubic mm and optically coupled to the compact large area position sensitive photomultiplier H8500 from Hamamatsu. The mean resolution in all non-trivial moments was found to be smaller than 5% but their direct use as estimates for the three-dimensional photoconversion position turned out to be unsuitable. Standard polynomial interpolation in higher dimensions has been adopted to reconstruct the impact positions of the gamma-rays from the measured moments. When using the reconstructed impact positions, the intrinsic mean spatial resolution of the detector was found to be 1.9 mm for the transverse components and 3.9 mm for the depth of interaction. Using directly the bare moments as position estimate, the intrinsic mean spatial resolution of the detector was found to be 3.4 mm and 4.9 mm, respectively. The cost for the required detector improvements are essentially negligible.

Christoph W. Lerche

2006-11-01T23:59:59.000Z

85

OPTIMIZATION OF VIRTUAL FRISCH-GRID CdZnTe DETECTOR DESIGNS FOR IMAGING AND SPECTROSCOPY OF GAMMA RAYS.  

SciTech Connect (OSTI)

In the past, various virtual Frisch-grid designs have been proposed for cadmium zinc telluride (CZT) and other compound semiconductor detectors. These include three-terminal, semi-spherical, CAPture, Frisch-ring, capacitive Frisch-grid and pixel devices (along with their modifications). Among them, the Frisch-grid design employing a non-contacting ring extended over the entire side surfaces of parallelepiped-shaped CZT crystals is the most promising. The defect-free parallelepiped-shaped crystals with typical dimensions of 5x5{approx}12 mm3 are easy to produce and can be arranged into large arrays used for imaging and gamma-ray spectroscopy. In this paper, we report on further advances of the virtual Frisch-grid detector design for the parallelepiped-shaped CZT crystals. Both the experimental testing and modeling results are described.

BOLOTNIKOV,A.E.; ABDUL-JABBAR, N.M.; BABALOLA, S.; CAMARDA, G.S.; CUI, Y.; HOSSAIN, A.; JACKSON, E.; JACKSON, H.; JAMES, J.R.; LURYI, A.L.; JAMES, R.B.

2007-08-21T23:59:59.000Z

86

Dual isotope notch observer for isotope identification, assay and imaging with mono-energetic gamma-ray sources  

DOE Patents [OSTI]

A dual isotope notch observer for isotope identification, assay and imaging with mono-energetic gamma-ray sources includes a detector arrangement consists of three detectors downstream from the object under observation. The latter detector, which operates as a beam monitor, is an integrating detector that monitors the total beam power arriving at its surface. The first detector and the middle detector each include an integrating detector surrounding a foil. The foils of these two detectors are made of the same atomic material, but each foil is a different isotope, e.g., the first foil may comprise U235 and second foil may comprise U238. The integrating detectors surrounding these pieces of foil measure the total power scattered from the foil and can be similar in composition to the final beam monitor. Non-resonant photons will, after calibration, scatter equally from both foils.

Barty, Christopher P.J.

2013-02-05T23:59:59.000Z

87

Development of a high-resolution gamma-ray imaging system with synthetic collimation.  

E-Print Network [OSTI]

??This work outlines the development of a multi-pinhole single-photon emission computed tomography (SPECT) system designed to produce a synthetic-collimator image of a small field of (more)

Havelin, Ronan

2013-01-01T23:59:59.000Z

88

Attributes from NMIS Time Coincidence, Fast-Neutron Imaging, Fission Mapping, And Gamma-Ray Spectrometry Data  

SciTech Connect (OSTI)

This work tests a systematic procedure for analyzing data acquired by the Nuclear Materials Identification System (NMIS) at Oak Ridge National Laboratory with fast-neutron imaging and high-purity germanium (HPGe) gamma spectrometry capabilities. NMIS has been under development by the US Department of Energy Office of Nuclear Verification since the mid-1990s, and prior to that by the National Nuclear Security Administration Y-12 National Security Complex, with NMIS having been used at Y-12 for template matching to confirm inventory and receipts. In this present work, a complete set of NMIS time coincidence, fast-neutron imaging, fission mapping, and HPGe gamma-ray spectrometry data was obtained from Monte Carlo simulations for a configuration of fissile and nonfissile materials. The data were then presented for analysis to someone who had no prior knowledge of the unknown object to accurately determine the description of the object by applying the previously-mentioned procedure to the simulated data. The best approximation indicated that the unknown object was composed of concentric cylinders: a void inside highly enriched uranium (HEU) (84.7 {+-} 1.9 wt % {sup 235}U), surrounded by depleted uranium, surrounded by polyethylene. The final estimation of the unknown object had the correct materials and geometry, with error in the radius estimates of material regions varying from 1.58% at best and 4.25% at worst; error in the height estimates varied from 2% to 12%. The error in the HEU enrichment estimate was 5.9 wt % (within 2.5{sigma} of the true value). The accuracies of the determinations could be adequate for arms control applications. Future work will apply this iterative reconstructive procedure to other unknown objects to further test and refine it.

Swift, Alicia L [ORNL] [ORNL; Grogan, Brandon R [ORNL] [ORNL; Mullens, James Allen [ORNL] [ORNL; Hayward, J P [University of Tennessee, Knoxville (UTK)] [University of Tennessee, Knoxville (UTK); Mihalczo, John T [ORNL] [ORNL

2012-01-01T23:59:59.000Z

89

Geotech Logging Services | Open Energy Information  

Open Energy Info (EERE)

Logging Services Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Geotech Logging Services Author Geotech Logging Servces LLC Published Publisher...

90

Characterization of the Germania Spraberry unit from analog studies and cased-hole neutron log data  

E-Print Network [OSTI]

a dependent variable (permeability) from multiple independent variables (rock type, shale volume and porosity) will also be investigated in this study. A log data base includes digitized formats of gamma ray, cased hole neutron, limited resistivity...

Olumide, Babajide Adelekan

2005-11-01T23:59:59.000Z

91

Density Log | Open Energy Information  

Open Energy Info (EERE)

Density Log Density Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Density Log Details Activities (6) Areas (6) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: provides data on the bulk density of the rock surrounding the well Stratigraphic/Structural: Stratigraphic correlation between well bores. Hydrological: Porosity of the formations loggesd can be calculated for the Density log andprovide an indication potential aquifers. Thermal: Cost Information Low-End Estimate (USD): 0.4040 centUSD 4.0e-4 kUSD 4.0e-7 MUSD 4.0e-10 TUSD / foot Median Estimate (USD): 0.6868 centUSD

92

Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation-  

Open Energy Info (EERE)

Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Results From The Alum 25-29 Well, Nevada Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Results From The Alum 25-29 Well, Nevada Details Activities (6) Areas (1) Regions (0) Abstract: This paper presents the results of analysis of a state of the art set of wireline petrophysical and wellbore image logs recorded in the Alum 25-29 well, southwestern Nevada. The Alum well penetrated nearly 2000 ft (610 m) of volcano-clastic rocks and more than 1000 ft of basement, separated from the sediments by a shallowly dipping detachment fault. The logs were acquired both to characterize the site and also to select the

93

Acoustic paramagnetic logging tool  

DOE Patents [OSTI]

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth3 s magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation . The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores.

Vail, III, William B. (Bothell, WA)

1988-01-01T23:59:59.000Z

94

Acoustic Logs | Open Energy Information  

Open Energy Info (EERE)

Acoustic Logs Acoustic Logs Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Acoustic Logs Details Activities (7) Areas (6) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: determine porosity of layers Stratigraphic/Structural: map discontinuities to determine their orientation. Hydrological: Thermal: Cost Information Low-End Estimate (USD): 1.00100 centUSD 1.0e-3 kUSD 1.0e-6 MUSD 1.0e-9 TUSD / foot Median Estimate (USD): 4.62462 centUSD 0.00462 kUSD 4.62e-6 MUSD 4.62e-9 TUSD / foot High-End Estimate (USD): 16.001,600 centUSD 0.016 kUSD 1.6e-5 MUSD 1.6e-8 TUSD / foot

95

Mud Logging | Open Energy Information  

Open Energy Info (EERE)

Mud Logging Mud Logging Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Mud Logging Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: Lithological layers are identified from drill cuttings Stratigraphic/Structural: Porosity of rocks Hydrological: Fluid content of the borehole while drilling can be determined Thermal: Cost Information Low-End Estimate (USD): 1,300.00130,000 centUSD 1.3 kUSD 0.0013 MUSD 1.3e-6 TUSD / day Median Estimate (USD): 1,450.00145,000 centUSD 1.45 kUSD 0.00145 MUSD 1.45e-6 TUSD / day High-End Estimate (USD): 2,000.00200,000 centUSD

96

Inference of strata separation and gas emission paths in longwall overburden using continuous wavelet transform of well logs and geostatistical simulation  

Science Journals Connector (OSTI)

Abstract Prediction of potential methane emission pathways from various sources into active mine workings or sealed gobs from longwall overburden is important for controlling methane and for improving mining safety. The aim of this paper is to infer strata separation intervals and thus gas emission pathways from standard well log data. The proposed technique was applied to well logs acquired through the Mary Lee/Blue Creek coal seam of the Upper Pottsville Formation in the Black Warrior Basin, Alabama, using well logs from a series of boreholes aligned along a nearly linear profile. For this purpose, continuous wavelet transform (CWT) of digitized gamma well logs was performed by using Mexican hat and Morlet, as the mother wavelets, to identify potential discontinuities in the signal. Pointwise Hlder exponents (PHE) of gamma logs were also computed using the generalized quadratic variations (GQV) method to identify the location and strength of singularities of well log signals as a complementary analysis. \\{PHEs\\} and wavelet coefficients were analyzed to find the locations of singularities along the logs. Using the well logs in this study, locations of predicted singularities were used as indicators in single normal equation simulation (SNESIM) to generate equi-probable realizations of potential strata separation intervals. Horizontal and vertical variograms of realizations were then analyzed and compared with those of indicator data and training image (TI) data using the KruskalWallis test. A sum of squared differences was employed to select the most probable realization representing the locations of potential strata separations and methane flow paths. Results indicated that singularities located in well log signals reliably correlated with strata transitions or discontinuities within the strata. Geostatistical simulation of these discontinuities provided information about the location and extents of the continuous channels that may form during mining. If there is a gas source within their zone of influence, paths may develop and allow methane movement towards sealed or active gobs under pressure differentials. Knowledge gained from this research will better prepare mine operations for potential methane inflows, thus improving mine safety.

C. zgen Karacan; Ricardo A. Olea

2014-01-01T23:59:59.000Z

97

High-energy radiation visualizer (HERV): A new system for imaging in x-ray and gamma-ray emission regions  

SciTech Connect (OSTI)

The authors present a description and results of the operation for {gamma}-ray and X-ray objects for the compact visualization system high-energy radiation visualizer (HERV). The imaging in this system is based on use of a conical collimator, scintillator plate, and image intensifier as a detector and CCD matrix as a readout device. The use of HERV as a two-dimensional X-ray image visualizer for the Compton scatter inspection system was considered and first results are discussed. The possibility of using different hexagonal-coded apertures imaging for HERV is discussed and results of Monte Carlo simulation and experiments with optical analog of coded aperture are presented.

Sudarkin, A.N.; Ivanov, O.P.; Stepanov, V.E.; Volkovich, A.G.; Turin, A.S.; Danilovich, A.S.; Rybakov, D.D.; Urutskoev, L.I. [RECOM Ltd., Moscow (Russian Federation)] [RECOM Ltd., Moscow (Russian Federation)

1996-08-01T23:59:59.000Z

98

Ultrasonic logging in cased boreholes for corrosion evaluation  

SciTech Connect (OSTI)

The UltraSonic Imager (USI) is a wireline tool used for cement and casing evaluation. The USI tool uses a rotating ultrasonic transducer to give full coverage of the casing at high resolution. Each measurement made by the tool is presented with its associated color image. For corrosion applications, the most important of these measurements are casing internal radius and thickness. The color image format can be used to determine metal loss percentage, but also plays a key role in quality control to validate the characteristics of the log. The Bureau of Land Management has recently instructed operators in the Imperial Valley to perform casing integrity testing on geothermal injection wells sufficiently past the zones of fresh water to prevent contamination. Wireline logging with the USI tool is currently being used to perform the casing evaluations. Field examples illustrate results of the corrosion, mechanical wear, and internal scale deposits detected from the logs. Recovered casing is shown to validate the tool response.

Woods, T. [Schlumberger Well Services, Signal Hill, CA (United States)

1995-12-31T23:59:59.000Z

99

LOG HAZARD REGRESSION Huiying Sun  

E-Print Network [OSTI]

LOG HAZARD REGRESSION by Huiying Sun Ph.D, Harbin Institute of Technology, Harbin, CHINA, 1991 .................................................................... .................................................................... .................................................................... .................................................................... THE UNIVERSITY OF BRITISH COLUMBIA September, 1999 c flHuiying Sun, 1999 #12; Abstract We propose using

Heckman, Nancy E.

100

Caliper Log | Open Energy Information  

Open Energy Info (EERE)

Caliper Log Caliper Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Caliper Log Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Cost Information Low-End Estimate (USD): 0.4040 centUSD 4.0e-4 kUSD 4.0e-7 MUSD 4.0e-10 TUSD / foot Median Estimate (USD): 0.7878 centUSD 7.8e-4 kUSD 7.8e-7 MUSD 7.8e-10 TUSD / foot High-End Estimate (USD): 3.00300 centUSD 0.003 kUSD 3.0e-6 MUSD 3.0e-9 TUSD / foot Time Required Low-End Estimate: 0.35 days9.582478e-4 years 8.4 hours 0.05 weeks 0.0115 months / job

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


101

Definition: Density Log | Open Energy Information  

Open Energy Info (EERE)

Density Log Density Log Jump to: navigation, search Dictionary.png Density Log Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology, bulk density is a function of the density of the minerals forming a rock (i.e. matrix) and the fluid enclosed in the pore spaces.[1] View on Wikipedia Wikipedia Definition Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology, bulk density is a function of the density of the minerals forming a rock and the fluid enclosed in the pore spaces. This is one of three well logging tools that are commonly used to calculate porosity, the other two being sonic logging and neutron porosity logging

102

Gamma Log At Lightning Dock Geothermal Area (Witcher, 2006) ...  

Open Energy Info (EERE)

Number DE-FC07-00AL66977 Notes This project deepened a well and took 4 samples from wells around the Lightning Docks KGRA and performed extensive chamical and isotope analysis...

103

Internet Data logging and Display  

E-Print Network [OSTI]

. The solution presented here is to accomplish these goals is to include a miniature web server in a remote-logging module, which we designed as part of our device. Thus allowing data to be accessed more frequently, via the Internet. As it currently stands...

Sweeney, J., Jr.; Culp, C.; Haberl, J. S.

2001-01-01T23:59:59.000Z

104

The Energy Spectrum of TeV Gamma-Rays from the Crab Nebula as measured by the HEGRA system of imaging air Cherenkov telescopes  

E-Print Network [OSTI]

The Crab Nebula has been observed by the HEGRA (High-Energy Gamma-Ray Astronomy) stereoscopic system of imaging air Cherenkov telescopes (IACTs) for a total of about 200 hrs during two observational campaigns: from September 1997 to March 1998 and from August 1998 to April 1999. The recent detailed studies of system performance give an energy threshold and an energy resolution for gamma-rays of 500 GeV and ~ 18%, respectively. The Crab energy spectrum was measured with the HEGRA IACT system in a very broad energy range up to 20 TeV, using observations at zenith angles up to 65 degrees. The Crab data can be fitted in the energy range from 1 to 20 TeV by a simple power-law, which yields dJg/dE = (2.79+/-0.02 +/- 0.5) 10^{-7} E^{-2.59 +/- 0.03 +/- 0.05}, ph m^{-2} s^{-1} TeV^{-1} The Crab Nebula energy spectrum, as measured with the HEGRA IACT system, agrees within 15% in the absolute scale and within 0.1 units in the power law index with the latest measurements by the Whipple, CANGAROO and CAT groups, consistent within the statistical and systematic errors quoted by the experiments. The pure power-law spectrum of TeV gamma-rays from the Crab Nebula constrains the physics parameters of the nebula environment as well as the models of photon emission.

F. Aharonian; The HEGRA Collaboration

2000-03-13T23:59:59.000Z

105

The Impact of the Russian Log Export Tariff on the Global Market for Logs and Lumber  

E-Print Network [OSTI]

in Russia, estimated at 808,790,000 hectares, represents 20.5% of total global forest area and almost halfSharfofLogExports(%) Figure 1. Russian softwood log exports represent over a quarter of total global log exports. SourceThe Impact of the Russian Log Export Tariff on the Global Market for Logs and Lumber CINTRAFOR News

106

Design of a near-field coded aperture cameras for high-resolution medical and industrial gamma-ray imaging  

E-Print Network [OSTI]

Coded Aperture Imaging is a technique originally developed for X-ray astronomy, where typical imaging problems are characterized by far-field geometry and an object made of point sources distributed over a mainly dark ...

Accorsi, Roberto, 1971-

2001-01-01T23:59:59.000Z

107

Density Log at Alum Area (Moos & Ronne, 2010) | Open Energy Information  

Open Energy Info (EERE)

Moos & Ronne, 2010) Moos & Ronne, 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Density Log at Alum Geothermal Area (Moos & Ronne, 2010) Exploration Activity Details Location Alum Geothermal Area Exploration Technique Density Log Activity Date Usefulness useful DOE-funding Unknown Notes Density, photo-electric factor (PEF), neutron, and gamma ray (GR) logs provided sufficient information to clearly delineate basement lithologic variations, suggesting that pulsed neutron logs may not in many cases be needed, and density and electrical resistivity data were important to calibrate structural models based on surface surveys. References Daniel Moos, Joel Ronne (2010) Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Results From The Alum 25-29 Well,

108

Definition: Resistivity Log | Open Energy Information  

Open Energy Info (EERE)

Resistivity Log Resistivity Log Jump to: navigation, search Dictionary.png Resistivity Log Electrical resistivity logging is the measurement of potential (voltage) differences resulting from electrical current flow in the vicinity of a borehole in order to determine formation resistivity.[1] View on Wikipedia Wikipedia Definition Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity. Resistivity is a fundamental material property which represents how strongly a material opposes the flow of electric current. In these logs, resistivity is measured using 4 electrical probes to eliminate the resistance of the contact leads. The log must run in holes containing electrically conductive mud or water. Resistivity logging is

109

Applying multiwell normalization in open hole log analysis  

E-Print Network [OSTI]

A major problem when analyzing open hole well logging data in large fields is the fact that the logs were run using different logging service companies, using different logging tools over a long time span. To obtain correct log interpretations...

Sinanan, Haydn Brent

2012-06-07T23:59:59.000Z

110

Well Log Techniques | Open Energy Information  

Open Energy Info (EERE)

Well Log Techniques Well Log Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Well Log Techniques Details Activities (4) Areas (4) Regions (1) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Downhole Techniques Information Provided by Technique Lithology: depth and thickness of formations; lithology and porosity can be inferred Stratigraphic/Structural: reservoir thickness, reservoir geometry, borehole geometry Hydrological: permeability and fluid composition can be inferred Thermal: direct temperature measurements; thermal conductivity and heat capacity Dictionary.png Well Log Techniques: Well logging is the measurement of formation properties versus depth in a

111

Energy Citations Database (ECD) - Alerts Log On  

Office of Scientific and Technical Information (OSTI)

Log On You must Log On to use the ECD Alerts. Alerts provide users with e-mail notification of updates to the ECD in specific areas of interest. If you wish to receive an Alert and...

112

Vertical Flowmeter Logging | Open Energy Information  

Open Energy Info (EERE)

Flowmeter Logging Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Vertical Flowmeter Logging Author U.S. Geological Survey Published USGS Groundwater...

113

Geological well log analysis. Third ed  

SciTech Connect (OSTI)

Until recently, well logs have mainly been used for correlation, structural mapping, and quantitive evaluation of hydrocarbon bearing formations. This third edition of Geologic Well Log Analysis, however, describes how well logs can be used for geological studies and mineral exploration. This is done by analyzing well logs for numerous parameters and indices of significant mineral accumulation, primarily in sediments. Contents are: SP and Eh curves as redoxomorphic logs; sedimentalogical studies by log curve shapes; exploration for stratigraphic traps; continuous dipmeter as a structural tool; continuous dipmeter as a sedimentation tool; Paleo-facies logging and mapping; hydrogeology 1--hydrodynamics of compaction; hydrogeology 2--geostatic equilibrium; and hydrogeology 3--hydrodynamics of infiltration. Appendixes cover: Computer program for calculating the dip magnitude, azimuth, and the degree and orientation of the resistivity anisotrophy; a lithology computer program for calculating the curvature of a structure; and basic log analysis package for HP-41CV programmable calculator.

Pirson, S.J.

1983-01-01T23:59:59.000Z

114

Definition: Mud Logging | Open Energy Information  

Open Energy Info (EERE)

Mud Logging Mud Logging Jump to: navigation, search Dictionary.png Mud Logging Mud logs enable the geological description and analysis of rock cuttings suspended within the returned drilling mud and can provide a variety of useful information regarding reservoir parameters.[1] View on Wikipedia Wikipedia Definition Mud logging is the creation of a detailed record of a borehole by examining the cuttings of rock or brought to the surface by the circulating drilling medium (most commonly mud). Mud logging is usually performed by a third-party mud logging company. This provides well owners and producers with information about the lithology and fluid content of the borehole while drilling. Historically it is the earliest type of well log. Under some circumstances compressed air is employed as a circulating fluid,

115

Acoustic Logs At Alum Area (Moos & Ronne, 2010) | Open Energy Information  

Open Energy Info (EERE)

Acoustic Logs At Alum Geothermal Area (Moos & Ronne, Acoustic Logs At Alum Geothermal Area (Moos & Ronne, 2010) Exploration Activity Details Location Alum Geothermal Area Exploration Technique Acoustic Logs Activity Date Usefulness useful DOE-funding Unknown Notes The results revealed that acoustic images are superior to electrical images to detect structurally important natural fractures and stress-induced wellbore breakouts and tensile wall fractures, and were adequate to detect stratigraphic features. References Daniel Moos, Joel Ronne (2010) Selecting The Optimal Logging Suite For Geothermal Reservoir Evaluation- Results From The Alum 25-29 Well, Nevada Retrieved from "http://en.openei.org/w/index.php?title=Acoustic_Logs_At_Alum_Area_(Moos_%26_Ronne,_2010)&oldid=510215" Categories: Exploration Activities

116

Erroneous and inappropriate use of gamma fits to tracer-dilution curves in magnetic resonance imaging and nuclear medicine1  

E-Print Network [OSTI]

imaging and nuclear medicine1 Xingfeng Lia , Jie Tiana , R.K. Millardb, * a Medical Image Processing Group applica- tions of this versatile fitting function occur in nuclear med- icine [2,3], with the same of particles, taking account of back-dispersion in diffusion processes. An up-to-date introduction

Tian, Jie

117

University of Florida Cell Phone Usage Log  

E-Print Network [OSTI]

University of Florida Cell Phone Usage Log Information below must be compared to the monthly statement provided by the cell phone service provider. It is required that this log be completed when of the last page of the usage log. Employee's Name:Business Device - Cell Phone Number: Printed Name

Sin, Peter

118

LogOS: an Automatic Logging Framework for Service-Oriented Architectures  

E-Print Network [OSTI]

LogOS: an Automatic Logging Framework for Service-Oriented Architectures Stéphane Frénot Université architecture focuses on service oriented log- ging for component based architecture. It focuses on two providers in cases of failures. We motivate the need for an automatic logging framework in service-oriented

Paris-Sud XI, Université de

119

Spontaneous Potential Well Log | Open Energy Information  

Open Energy Info (EERE)

Spontaneous Potential Well Log Spontaneous Potential Well Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Spontaneous Potential Well Log Details Activities (2) Areas (2) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: SP technique originally applied to locating sulfide ore-bodies. Stratigraphic/Structural: -Formation bed thickness and boundaries -Detection and tracing of faults -Permeability and porosity Hydrological: Determination of fluid flow patterns: electrochemical coupling processes due to variations in ionic concentrations, and electrokinetic coupling processes due to fluid flow in the subsurface.

120

Neutron Log At Fort Bliss Area (Combs, Et Al., 1999) | Open Energy  

Open Energy Info (EERE)

Area (Combs, Et Al., 1999) Area (Combs, Et Al., 1999) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Neutron Log At Fort Bliss Area (Combs, Et Al., 1999) Exploration Activity Details Location Fort Bliss Area Exploration Technique Neutron Log Activity Date Usefulness not indicated DOE-funding Unknown Notes Three principal types of data were obtained from this drilling project: core samples of the lithology penetrated by the holes, records of drilling behavior (such as water level in the hole, changes in rate of penetration etc.), and multiple temperature logs (both during and after drilling) in each well. A suite of geophysical logs (gamma ray, neutron, sonic, and resistivity) was also run after completion of drilling. References Jim Combs, John T. Finger, Colin Goranson, Charles E. Hockox Jr.,

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


121

Coal deposit characterization by gamma-gamma density/percent dry ash relationships  

E-Print Network [OSTI]

: pb = C + Va(pa) Equation 3 where C is a constant. Ash content can therefore be geophysically determined as variations In log-derived bulk density measurements are in direct response to variations in ash content. However, when any of the above... by applying the relationships between geophysi cally-derived gamma-gamma density and laboratory-derived percent dry ash. The linear gamma-gamma density/percent dry ash relationship is dependent upon a constant fuel ratio (percent fixed carbon...

Wright, David Scott

1984-01-01T23:59:59.000Z

122

Request Log Closedl Date Yes  

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

6 FOIA 6 FOIA - Request Log Closedl Date Yes 01 127106 Yes 02/23/06 Yes 04/05/06 Yes 04/03/06 Yes 04/03/06 Yes 05/22/06 Yes 35/30/06 - No. - 00 1 - 002 - 003 - 004 005 006 - 307 - Dated 01 125106 0211 6106 03/29/06 03/31 106 14/03/06 1511 8/06 )5/22/06 Date Rec'd 0 I I2 5/06 02/23/06 03130/06 0313 1 106 04/03/06 05/22/06 05/22/06 HQ or Dir. Direct Transfer from HQ Direct Trans from HQ Direct Direct Transfer 'rom HQ Subject Requesting a list of all your Procurement card holders Requesting copies of any and all Freedom of Information Act (FOIA) requests submitted to the Department of Energy (DOE) by Donna Wright, the Bradenton Herald, or any other individual that requested documentation or information pertaining to the Loral American Beryllium Corporation (also known as the

123

Research and Methodological Foundations of Transaction Log  

E-Print Network [OSTI]

approach to data collection and a research method for both system performance and user behavior analysis and users of that system. These log files can come from a variety of computers and systems (Websites interactions. Transaction log analysis is the methodological approach to studying online systems and users

Jansen, James

124

CORRUPTION AND ILLEGAL LOGGING IN THE WOOD  

E-Print Network [OSTI]

CORRUPTION AND ILLEGAL LOGGING IN THE WOOD PRODUCTS MARKET: the Italian experience in controlling% of wood international trade is based on illegal logging; a total value of 150 Billion $/year (OECD Environmental Outlook, 2001) · At least 50% of wood removals in the Amazon basin, Central Africa and South

Pettenella, Davide

125

SOME RESULTS ON SCATTERING FOR LOG-SUBCRITICAL AND LOG-SUPERCRITICAL  

E-Print Network [OSTI]

SOME RESULTS ON SCATTERING FOR LOG-SUBCRITICAL AND LOG-SUPERCRITICAL NONLINEAR WAVE EQUATIONS HSI equations. First, we consider the H1 x ? L2 x scattering theory for the energy log- subcritical wave regularity) Sobolev space. We include also some observation about scattering in the energy subcritical case

Weinberger, Hans

126

Definition: Chemical Logging | Open Energy Information  

Open Energy Info (EERE)

Logging Logging Jump to: navigation, search Dictionary.png Chemical Logging Chemical logging produces a chemical profile of the formation fluid within a well based on the measurement of changes in the chemical composition of the drilling fluid during drilling operations.[1] References ↑ http://www.osti.gov/bridge/servlets/purl/6076582-xtVTIk/6076582.pdf Ret Like Like You like this.Sign Up to see what your friends like. rieved from "http://en.openei.org/w/index.php?title=Definition:Chemical_Logging&oldid=600357" Category: Definitions What links here Related changes Special pages Printable version Permanent link Browse properties About us Disclaimers Energy blogs Linked Data Developer services OpenEI partners with a broad range of international organizations to grow

127

Definition: Cement Bond Log | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Cement Bond Log Jump to: navigation, search Dictionary.png Cement Bond Log A representation of the integrity of the cement job, especially whether the cement is adhering solidly to the outside of the casing. The log is typically obtained from one of a variety of sonic-type tools. The newer versions, called cement evaluation logs, along with their processing software, can give detailed, 360-degree representations of the integrity of the cement job, whereas older versions may display a single line representing the integrated integrity around the casing.[1] Related Terms Acoustic Logs References ↑ Schlumberger Oilfield Glossary Ret LikeLike UnlikeLike You like this.Sign Up to see what your friends like.

128

Energy Citations Database (ECD) - Alerts Log On  

Office of Scientific and Technical Information (OSTI)

ECD Alerts Log On Alerts provide users with e-mail notification of updates to the ECD in specific areas of interest. If you wish to receive an Alert and are not registered, please...

129

Logs Wood Chips Straw Corn Switchgrass  

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

Clean energy can come from the sun. The energy in wind can make electricity. Bioenergy comes from plants we can turn into fuel. Logs Wood Chips Straw Corn Switchgrass We can use...

130

CMLOG: A common message logging system  

SciTech Connect (OSTI)

The Common Message Logging (CMLOG) system is an object-oriented and distributed system that not only allows applications and systems to log data (messages) of any type into a centralized database but also lets applications view incoming messages in real-time or retrieve stored data from the database according to selection rules. It consists of a concurrent Unix server that handles incoming logging or searching messages, a Motif browser that can view incoming messages in real-time or display stored data in the database, a client daemon that buffers and sends logging messages to the server, and libraries that can be used by applications to send data to or retrieve data from the database via the server. This paper presents the design and implementation of the CMLOG system meanwhile it will also address the issue of integration of CMLOG into existing control systems.

Chen, J.; Akers, W.; Bickley, M.; Wu, D.; Watson, W. III [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Control Software Group

1997-12-01T23:59:59.000Z

131

Pressure Temperature Log | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Pressure Temperature Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Pressure Temperature Log Details Activities (13) Areas (13) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Perturbations in temperature or pressure can be indicative of faults or other structural features Hydrological: fluid cirulation, over-pressured zones, and under-pressured zones. Thermal: Temperature profile with depth Cost Information Low-End Estimate (USD): 0.6060 centUSD 6.0e-4 kUSD

132

The Universe Viewed in Gamma-Rays 1 Toward Ultra Short Gamma Ray Burst Ground Based De-  

E-Print Network [OSTI]

The Universe Viewed in Gamma-Rays 1 Toward Ultra Short Gamma Ray Burst Ground Based De- tection- liminary data taking started in November 2002. 1. Introduction Gamma-ray bursts observed with space Tcherenkovlightfromoneshower Few 100MeV gamma-rays Fig. 1. In an imaging telescope, -ray bursts should appear as a Cherenkov

Enomoto, Ryoji

133

Acoustic Logs At Newberry Caldera Area (Combs, Et Al., 1999) | Open Energy  

Open Energy Info (EERE)

Acoustic Logs At Newberry Caldera Area (Combs, Et Al., 1999) Acoustic Logs At Newberry Caldera Area (Combs, Et Al., 1999) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Acoustic Logs At Newberry Caldera Area (Combs, Et Al., 1999) Exploration Activity Details Location Newberry Caldera Area Exploration Technique Acoustic Logs Activity Date Usefulness could be useful with more improvements DOE-funding Unknown Notes The acoustic borehole televiewer (BHTV) was run twice in the wellbore with limited success. There were several problems with the tool's fimctions, but images were successfully obtained over the interval from 2748' to 3635'. References Jim Combs, John T. Finger, Colin Goranson, Charles E. Hockox Jr., Ronald D. Jacobsen, Gene Polik (1999) Slimhole Handbook- Procedures And Recommendations For Slimhole Drilling And Testing In Geothermal Exploration

134

VEHICLE USAGE LOG Department ________________________________________ Vehicle Homebase ____________________________ Week Ended (Sunday) _________________  

E-Print Network [OSTI]

VEHICLE USAGE LOG Department ________________________________________ Vehicle Homebase (rev. 10/2005-ecb) #12;Vehicle Usage Log Instructions General instructions: The details of the use

Yang, Zong-Liang

135

Manager's Signature Log Privacy Impact Assessment, Office of...  

Energy Savers [EERE]

Manager's Signature Log Privacy Impact Assessment, Office of Science Chicago Office Manager's Signature Log Privacy Impact Assessment, Office of Science Chicago Office Manager's...

136

Well Log Data At Valles Caldera - Redondo Geothermal Area (Shevenell...  

Open Energy Info (EERE)

Area Exploration Technique Well Log Data Activity Date - 1988 Usefulness useful DOE-funding Unknown Exploration Basis The study reports well log data from five wells...

137

Green Energy Resources Inc formerly New York International Log...  

Open Energy Info (EERE)

International Log Lumber Company Jump to: navigation, search Name: Green Energy Resources Inc (formerly New York International Log & Lumber Company) Place: San Antonio, Texas...

138

Pressure Temperature Log At Glass Buttes Area (DOE GTP) | Open...  

Open Energy Info (EERE)

Pressure Temperature Log At Glass Buttes Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Glass Buttes...

139

Gamma ray camera  

DOE Patents [OSTI]

A gamma ray camera for detecting rays emanating from a radiation source such as an isotope. The gamma ray camera includes a sensor array formed of a visible light crystal for converting incident gamma rays to a plurality of corresponding visible light photons, and a photosensor array responsive to the visible light photons in order to form an electronic image of the radiation therefrom. The photosensor array is adapted to record an integrated amount of charge proportional to the incident gamma rays closest to it, and includes a transparent metallic layer, photodiode consisting of a p-i-n structure formed on one side of the transparent metallic layer, and comprising an upper p-type layer, an intermediate layer and a lower n-type layer. In the preferred mode, the scintillator crystal is composed essentially of a cesium iodide (CsI) crystal preferably doped with a predetermined amount impurity, and the p-type upper intermediate layers and said n-type layer are essentially composed of hydrogenated amorphous silicon (a-Si:H). The gamma ray camera further includes a collimator interposed between the radiation source and the sensor array, and a readout circuit formed on one side of the photosensor array.

Perez-Mendez, Victor (Berkeley, CA)

1997-01-01T23:59:59.000Z

140

Gamma ray camera  

DOE Patents [OSTI]

A gamma ray camera is disclosed for detecting rays emanating from a radiation source such as an isotope. The gamma ray camera includes a sensor array formed of a visible light crystal for converting incident gamma rays to a plurality of corresponding visible light photons, and a photosensor array responsive to the visible light photons in order to form an electronic image of the radiation therefrom. The photosensor array is adapted to record an integrated amount of charge proportional to the incident gamma rays closest to it, and includes a transparent metallic layer, photodiode consisting of a p-i-n structure formed on one side of the transparent metallic layer, and comprising an upper p-type layer, an intermediate layer and a lower n-type layer. In the preferred mode, the scintillator crystal is composed essentially of a cesium iodide (CsI) crystal preferably doped with a predetermined amount impurity, and the p-type upper intermediate layers and said n-type layer are essentially composed of hydrogenated amorphous silicon (a-Si:H). The gamma ray camera further includes a collimator interposed between the radiation source and the sensor array, and a readout circuit formed on one side of the photosensor array. 6 figs.

Perez-Mendez, V.

1997-01-21T23:59:59.000Z

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


141

Cement Bond Log | Open Energy Information  

Open Energy Info (EERE)

Cement Bond Log Cement Bond Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Cement Bond Log Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Acoustic Logs Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Cost Information Low-End Estimate (USD): 0.8585 centUSD 8.5e-4 kUSD 8.5e-7 MUSD 8.5e-10 TUSD / foot Median Estimate (USD): 1.25125 centUSD 0.00125 kUSD 1.25e-6 MUSD 1.25e-9 TUSD / foot High-End Estimate (USD): 3.00300 centUSD 0.003 kUSD 3.0e-6 MUSD 3.0e-9 TUSD / foot Time Required Low-End Estimate: 0.35 days9.582478e-4 years 8.4 hours 0.05 weeks 0.0115 months / job

142

Combating Illegal LoggingCombating Illegal Logging in Russia:in Russia  

E-Print Network [OSTI]

Combating Illegal LoggingCombating Illegal Logging in Russia:in Russia: Case study ofCase study of PrimorskyPrimorsky RegionRegion AlexeyAlexey MorozovMorozov Greenpeace RussiaGreenpeace Russia http://www region: 2000 #12;RUSSIA Official Responses 7 of July 2000 Head of Nature Resource Committee

143

Combating Illegal LoggingCombating Illegal Logging in Russia:in Russia  

E-Print Network [OSTI]

Combating Illegal LoggingCombating Illegal Logging in Russia:in Russia: Case study ofCase study of PrimorskyPrimorsky RegionRegion AlexeyAlexey MorozovMorozov Greenpeace RussiaGreenpeace Russia #12;Primorsky #12;RUSSIA Official Responses 7 of July 2000 Head of Nature Resource Committee of the Primorsky

144

Annual Logging Symposium, June 22-26, 2013 PORE-SCALE MODELING OF ELECTRICAL RESISTIVITY  

E-Print Network [OSTI]

. Electrical resistivity is calculated with a finite- difference solution of Kirchhoff's voltage law appliedSPWLA 54th Annual Logging Symposium, June 22-26, 2013 1 PORE-SCALE MODELING OF ELECTRICAL RESISTIVITY AND PERMEABILITY IN FIB-SEM IMAGES OF HYDROCARBON-BEARING SHALE Vahid Shabro, Shaina Kelly, Carlos

Torres-Verdín, Carlos

145

Gamma?ray burst observations: Past and future  

Science Journals Connector (OSTI)

The past 20 years of gamma?ray burst observations are summarized. Time history morphologies and durations are discussed as well as continuum and line energy spectra. The results of statistical studies on the spatial distribution log N(?S)??log?S and V/V max are presented and the status of quiescent and transient counterpart searches are reviewed. A table of soon?to?be?obsolete Gamma?ray Burst World Records is given. Due to the presence of new ground?based and space experiments it seems likely that substantial progress in understanding this phenomenon will be made in the 90s

K. Hurley

1991-01-01T23:59:59.000Z

146

2011 Daily Log Report #: 2011-00168  

E-Print Network [OSTI]

2011 Daily Log March 2011 Report #: 2011-00168 Reported: 03/31/2011 1237 Occurred: 03/31/2011 1235 Incident: Medical Emergency Location: Outside of Student Union Disposition: Report--Closed Comments: Female transported to hospital by ambulance for medical treatment. Report #: 2011-00167 Reported: 03/31/2011 1116

Boyce, Richard L.

147

2009 Daily Log Report #: 2009-00202  

E-Print Network [OSTI]

2009 Daily Log March 2009 Report #: 2009-00202 Reported: 03/31/09 2045 Occurred: 03/29/09 1400 to 03/30/09 2000 Incident: Theft Location: Lot Q Disposition: Report--Open Comments: GPS System stolen from unlocked vehicle. Report #: 2009-00201 Reported: 03/31/09 1833 Occurred: Same Incident: Fire

Boyce, Richard L.

148

2009 Daily Log Report #: 2009-00269  

E-Print Network [OSTI]

2009 Daily Log April 2009 Report #: 2009-00269 Reported: 04/30/09 1508 Occurred: Same Incident: Traffic Crash Location: Johns Hill Road and Kenton Drive Disposition: Report--Closed Comments: Two vehicle accident; no injuries. Report #: 2009-00268 Reported: 04/30/09 1049 Occurred: Same Incident: Traffic Crash

Boyce, Richard L.

149

2011 Daily Log Report #: 2011-00229  

E-Print Network [OSTI]

2011 Daily Log April 2011 Report #: 2011-00229 Reported: 04/29/2011 2327 Occurred: 04/29/2011 2325 Incident: Medical Emergency Location: University Center Disposition: Report--Closed Comments: Female transported by ambulance to hospital for medical treatment. Report #: 2011-00228 Reported: 04/29/2011 1702

Boyce, Richard L.

150

2010 Daily Log Report #: 2010-00262  

E-Print Network [OSTI]

2010 Daily Log June 2010 Report #: 2010-00262 Reported: 06/30/10 0957 Occurred: 06/24/10 1630 to 0957 Incident: Theft Location: Founders Hall Disposition: Report--Open Comments: Several textbooks stolen from office. No Reportable Activity on 06/29/10 Report #: 2010-00261 Reported: 06/28/10 1720

Boyce, Richard L.

151

2009 Daily Log Report #: 2009-00327  

E-Print Network [OSTI]

2009 Daily Log June 2009 Report #: 2009-00327 Reported: 06/30/09 1118 Occurred: Same Incident: Fire/Smoke Alarm Location: Dorm--Kentucky Hall Disposition: Report--Closed Comments: Alarm activation caused by drywall dust from contractors; fire department responded and cleared the scene. No Reportable Activity

Boyce, Richard L.

152

2011 Daily Log Report #: 2011-00261  

E-Print Network [OSTI]

2011 Daily Log May 2011 Report #: 2011-00261 Reported: 05/31/2011 1300 Occurred: Same Incident: Medical Emergency Location: University Center Disposition: Report--Closed Comments: Male transported to hospital by ambulance for evaluation and treatment. No Reportable Activity on 05/30/2011 No Reportable

Boyce, Richard L.

153

2011 Daily Log Report #: 2011-00295  

E-Print Network [OSTI]

2011 Daily Log June 2011 Report #: 2011-00295 Reported: 6/30/2011 0813 Occurred: 6/29/2011 1430 Incident: Traffic Crash Location: Sidewalk on Plaza Level Disposition: Report--Closed Comments: Single vehicle accident; no injuries. Report #: 2011-00294 Reported: 06/29/2011 1909 Occurred: Same Incident

Boyce, Richard L.

154

2010 Daily Log Report #: 2010-00221  

E-Print Network [OSTI]

2010 Daily Log April 2010 Report #: 2010-00221 Reported: 04/30/10 1034 Occurred: Same Incident: Found/Recovered Property Location: Founders Hall Disposition: Report--Closed Comments: Small purse was found in classroom. Report #: 2010-00220 Reported: 04/30/10 1347 Occurred: 04/30/10 0820 to 0900

Boyce, Richard L.

155

2011 Daily Log Report #: 2011-00317  

E-Print Network [OSTI]

2011 Daily Log July 2011 Report #: 2011-00317 Reported: 07/30/2011 1446 Occurred: 07/30/2011 1435 Incident: Odor Related Complaint Location: Power Plant Disposition: Report--Closed Comments: Subject reported a strange odor emanating from somewhere in the vicinity; fire department responded and cleared

Boyce, Richard L.

156

Navjot's nightmare revisited: logging, agriculture, and biodiversity  

E-Print Network [OSTI]

forests. Conversely, conversion of primary or logged forests to plantation crops, such as oil palm, causes the biodiversity of this region. Our analysis also suggests that, because South- east Asian forests are tightly and replaced with a nonforest landcover (e.g., agriculture including oil palm and rubber, timber plantations

Vermont, University of

157

Monthly Tank Inspection Log Name of Campus  

E-Print Network [OSTI]

Monthly Tank Inspection Log Name of Campus Street Address of Campus City, State, and Zip Code of Campus 1 of 2 1. Facility PBS Registration Number 6. DISTRIBUTE TO : 2. Tank Number 3. Tank Registered(S) Satisfactory Repair or Adjustment Required Not Applicable Additional Comments Attached ABOVEGROUND STORAGE TANK

Rosen, Jay

158

Gamma ray bursts: A 1983 overview  

Science Journals Connector (OSTI)

Gamma?ray burst observations are reviewed with mention of new gamma?ray and optical transient measurements and with discussions of the controversial contradictory and unresolved issues that have recently emerged: burst spectra appear to fluctuate in time as rapidly as they are measured implying that any one spectrum may be incorrect; energy spectra can be obligingly fitted to practically any desired shape implying in effect that no objective spectral resolution exists at all; burst fluxes and temporal quantities including the total event energy are characterized very differently with differing instruments implying that even elementary knowledge of their properties is instrumentally subjective; finally the log N?log S determinations are deficient in the weak bursts while there is no detection of a source direction anisotropy implying that Ptolemy was right or that burst source distance estimates are basically guesswork. These issues may remain unsolved until vastly improved instruments are flown.

T. L. Cline

1984-01-01T23:59:59.000Z

159

Imaging  

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

Imaging Print Imaging Print The wavelengths of soft x-ray photons (1-15 nm) are very well matched to the creation of "nanoscopes" capable of probing the interior structure of biological cells and inorganic mesoscopic systems.Topics addressed by soft x-ray imaging techniques include cell biology, nanomagnetism, environmental science, and polymers. The tunability of synchrotron radiation is absolutely essential for the creation of contrast mechanisms. Cell biology CAT scans are performed in the "water window" (300-500 eV). Nanomagnetism studies require the energy range characteristic of iron, cobalt, and nickel (600-900 eV). Mid- and far-infrared (energies below 1 eV) microprobes using synchrotron radiation are being used to address problems such as chemistry in biological tissues, chemical identification and molecular conformation, environmental biodegradation, mineral phases in geological and astronomical specimens, and electronic properties of novel materials. Infrared synchrotron radiation is focused through, or reflected from, a small spot on the specimen and then analyzed using a spectrometer. Tuning to characteristic vibrational frequencies serves as a sensitive fingerprint for molecular species. Images of the various species are built up by raster scanning the specimen through the small illuminated spot.

160

Energy Efficiency in Log Homes | Department of Energy  

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

Energy Efficiency in Log Homes Energy Efficiency in Log Homes Energy Efficiency in Log Homes April 13, 2012 - 11:29am Addthis Consider energy efficiency when designing or purchasing a log home. | Photo courtesy of ©iStockphoto.com/tinabelle Consider energy efficiency when designing or purchasing a log home. | Photo courtesy of ©iStockphoto.com/tinabelle What does this mean for me? Before designing or purchasing a log home, you should consider several factors related to energy efficiency. Log homes may be site-built or pre-cut in a factory for delivery to the site. Some log home manufacturers can also customize their designs. Before designing or purchasing a manufactured log home, you should consider several factors related to energy efficiency. The R-Value of Wood A material's thermal resistance or resistance to heat flow is measured by

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


161

Energy Efficiency in Log Homes | Department of Energy  

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

Energy Efficiency in Log Homes Energy Efficiency in Log Homes Energy Efficiency in Log Homes April 13, 2012 - 11:29am Addthis Consider energy efficiency when designing or purchasing a log home. | Photo courtesy of ©iStockphoto.com/tinabelle Consider energy efficiency when designing or purchasing a log home. | Photo courtesy of ©iStockphoto.com/tinabelle What does this mean for me? Before designing or purchasing a log home, you should consider several factors related to energy efficiency. Log homes may be site-built or pre-cut in a factory for delivery to the site. Some log home manufacturers can also customize their designs. Before designing or purchasing a manufactured log home, you should consider several factors related to energy efficiency. The R-Value of Wood A material's thermal resistance or resistance to heat flow is measured by

162

Microsoft Word - FOIA Log FY 2001.doc  

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

1 FOIA - Request Log 1 FOIA - Request Log 1 Closed/ Date No. Dated Date Rec'd HQ or Dir. Subject Yes/ 3/29/01 001 02/01/01 02/01/01 01-0021C Transfer AL Copies of all documents including studies and memoranda, which may identify or consider WIPP site in Carlsbad, NM as a potential site for storage or disposal of spent reactor fuel or high-level radioactive wastes 2. All documents including studies, memoranda, hypothesizing, considering, recommending, or suggesting the WIPP site in NM as an alternative site to the Yucca Mountain site in NV. 3. All documents or lists setting forth the alternative sites that may potential be considered by DOE if the Yucca Mountain site is for any reason not selected to be the DOE site receiving high level radioactive waste or spent reactor fuel. If alternative potential sites have

163

Microsoft Word - FOIA Log FY 2002.doc  

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

FOIA - Request Log FOIA - Request Log 1 Closed/ Date No. Dated Date Rec'd HQ or Dir. Subject Yes/ 1/30/02 001 12/3/02 12/21/02 Richland Transfer Richland Operation Office search for records they located documents originated by the DOE Carlsbad Field Office that may be responsive to Mr. Hongs request. By transfer of this letter they forwarded Mr. Hong request, along with the documents located at Richland to the Carlsbad FOIA Office. CBFO will respond directly to Mr. Hong with a release determination Yes/ 2/13/02 002 1/30/02 1/30/02 Direct Description of request: answers to 1) What is the makeup of the additional 2 MT now bound for WIPP? What sites will come from, in what quantities, and in what form? 2) What type of NEPA documentation will DOE conduct on this additional 2 MT? (Note: Disposal of this material

164

Microsoft Word - FOIA Log FY 2003.doc  

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

3 FOIA - Request Log 3 FOIA - Request Log 1 Closed/ Date No. Dated Date Rec'd HQ or Dir. Subject Yes/ 11/03/03 001 12/16/02 1/7/03 Transfer from HQ Documentation provided identifying all Waste Isolation Pilot Plant contractors and their sub- contractors, as well as the principals for those entities. Yes 2/20/04 002 12/16/02 1/7/03 Transfer from HQ Documentation provided concerning the following Waste Isolation Pilot Plant related items: 1) Notify as to whether any portion of Westinghouse TRU Solutions work has been outsourced or privatized, and identify the outsource contact affected employees, 2) Notify as to whether environmental work done by Westinghouse TRU Solutions has undergone any changes involving position within company structure, management personnel, addition or deletions to scope of

165

Acoustic Waveform Logging - Advances In Theory And Application  

E-Print Network [OSTI]

Full-waveform acoustic logging has made significant advances in both theory and application in recent years, and these advances have greatly increased the capability of log analysts to measure the physical properties of ...

Cheng, C. H.

166

Well Log Data At Blue Mountain Geothermal Area (Fairbank & Niggemann...  

Open Energy Info (EERE)

well Deep Blue No. 1. Notes Well log data was collected in Deep Blue No. 1 upon its completion. The logging was conducted by Welaco Well Analysis Corporation. Temperature,...

167

Upland Log Volumes and Conifer Establishment Patterns in Two Northern,  

E-Print Network [OSTI]

conifer recruit densities on these logs and on the surrounding forest floor. We report significantly greater conifer recruit densities on log substrates as compared to the forest floor. Log substrate, height class and substrate for each established individual. Conifer recruit densities on the forest floor

Standiford, Richard B.

168

Well log evaluation of natural gas hydrates  

SciTech Connect (OSTI)

Gas hydrates are crystalline substances composed of water and gas, in which a solid-water-lattice accommodates gas molecules in a cage-like structure. Gas hydrates are globally widespread in permafrost regions and beneath the sea in sediment of outer continental margins. While methane, propane, and other gases can be included in the clathrate structure, methane hydrates appear to be the most common in nature. The amount of methane sequestered in gas hydrates is probably enormous, but estimates are speculative and range over three orders of magnitude from about 100,000 to 270,000,000 trillion cubic feet. The amount of gas in the hydrate reservoirs of the world greedy exceeds the volume of known conventional gas reserves. Gas hydrates also represent a significant drilling and production hazard. A fundamental question linking gas hydrate resource and hazard issues is: What is the volume of gas hydrates and included gas within a given gas hydrate occurrence? Most published gas hydrate resource estimates have, of necessity, been made by broad extrapolation of only general knowledge of local geologic conditions. Gas volumes that may be attributed to gas hydrates are dependent on a number of reservoir parameters, including the areal extent ofthe gas-hydrate occurrence, reservoir thickness, hydrate number, reservoir porosity, and the degree of gas-hydrate saturation. Two of the most difficult reservoir parameters to determine are porosity and degreeof gas hydrate saturation. Well logs often serve as a source of porosity and hydrocarbon saturation data; however, well-log calculations within gas-hydrate-bearing intervals are subject to error. The primary reason for this difficulty is the lack of quantitative laboratory and field studies. The primary purpose of this paper is to review the response of well logs to the presence of gas hydrates.

Collett, T.S.

1992-10-01T23:59:59.000Z

169

Well log evaluation of natural gas hydrates  

SciTech Connect (OSTI)

Gas hydrates are crystalline substances composed of water and gas, in which a solid-water-lattice accommodates gas molecules in a cage-like structure. Gas hydrates are globally widespread in permafrost regions and beneath the sea in sediment of outer continental margins. While methane, propane, and other gases can be included in the clathrate structure, methane hydrates appear to be the most common in nature. The amount of methane sequestered in gas hydrates is probably enormous, but estimates are speculative and range over three orders of magnitude from about 100,000 to 270,000,000 trillion cubic feet. The amount of gas in the hydrate reservoirs of the world greedy exceeds the volume of known conventional gas reserves. Gas hydrates also represent a significant drilling and production hazard. A fundamental question linking gas hydrate resource and hazard issues is: What is the volume of gas hydrates and included gas within a given gas hydrate occurrence Most published gas hydrate resource estimates have, of necessity, been made by broad extrapolation of only general knowledge of local geologic conditions. Gas volumes that may be attributed to gas hydrates are dependent on a number of reservoir parameters, including the areal extent ofthe gas-hydrate occurrence, reservoir thickness, hydrate number, reservoir porosity, and the degree of gas-hydrate saturation. Two of the most difficult reservoir parameters to determine are porosity and degreeof gas hydrate saturation. Well logs often serve as a source of porosity and hydrocarbon saturation data; however, well-log calculations within gas-hydrate-bearing intervals are subject to error. The primary reason for this difficulty is the lack of quantitative laboratory and field studies. The primary purpose of this paper is to review the response of well logs to the presence of gas hydrates.

Collett, T.S.

1992-10-01T23:59:59.000Z

170

Using borehole images for target-zone evaluation in horizontal wells  

SciTech Connect (OSTI)

Horizontal wells are rarely horizontal. Instead, operators commonly try to drill such wells into particular rock layers, or target zones, which may or may not be truly horizontal. Thicknesses of target zones commonly range from a few feet to a few tens of feet (1-10 m). Target-zone evaluation concerns whether a horizontal well was successfully located and drilled in a given rock layer. Borehole-imaging logs provide a powerful tool for stratigraphic interpretation and target-zone evaluation in the Austin Chalk, Niobrara Formation, San Andres Formation, and other units. This study uses borehole images generated by Schlumberger's Formation MicroScanner (FMS), a microconductivity logging device. Open fractures and clay-rich interbeds appear as dark, high-conductivity tracers on the FMS log. These traces can be fit with sinusoidal curves and oriented on a computer workstation. The shape of the sinusoidal curve that fits a particular bedding plane tells the interpreter whether the borehole was moving upward or downward through the strata. STRATLOG (trademark of Sierra Geophysics, Inc., a Halliburton Company) software has been used to display borehole profiles by combining FMS data on fracture intensities and bedding-plane intersections with gamma-ray logs, mud logs, and borehole-deviation surveys. To aid in planning future wells, multiple penetrations of the same horizon can be detected and used to calculate highly accurate bedding-plane dips. Fault interpretation, including the detection of rollover beds, it also possible. Finally, stratigraphic interpretation can be combined with observed fractures to determine which rock layers are most highly fractured, and, therefore, should be target zones.9 refs., 5 figs.

Hurley, N.F.; Carlson, J.L. (Marathon Oil Company, Littleton, CO (United States)); Thorn, D.R. (Schlumberger Well Services, Aurora (Colombia)); Eichelberger, L.W. (Marathon Oil Company, Tyler, TX (United States))

1994-02-01T23:59:59.000Z

171

Cross-Dipole Acoustic Log | Open Energy Information  

Open Energy Info (EERE)

Cross-Dipole Acoustic Log Cross-Dipole Acoustic Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Cross-Dipole Acoustic Log Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Acoustic Logs Information Provided by Technique Lithology: Stratigraphic/Structural: Rock stress and fracture analysis Hydrological: Use for fracture identification in open and cased holes. Also used for evaluating hydro fracturing/well stimulation effectiveness. Thermal: Dictionary.png Cross-Dipole Acoustic Log: An acoustic logging technique where the acoustic transmitter and receivers are lowered down hole and waveforms that travel through the well mud,

172

Chemical Logging At Raft River Geothermal Area (1979) | Open Energy  

Open Energy Info (EERE)

Logging At Raft River Geothermal Area (1979) Logging At Raft River Geothermal Area (1979) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Chemical Logging At Raft River Geothermal Area (1979) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Chemical Logging Activity Date 1979 Usefulness useful DOE-funding Unknown Exploration Basis To use new methods to assist geothermal well drilling. Notes Chemical logging resulted in the development of a technique to assist in geothermal well drilling and resource development. Calcium-alkalinity ratios plotted versus drill depth assisted in defining warm and hot water aquifers. Correlations between the calcium-alkalinity log and lithologic logs were used to determine aquifer types and detection of hot water zones

173

Acoustic Logs At Steamboat Springs Area (Combs, Et Al., 1999) | Open Energy  

Open Energy Info (EERE)

Steamboat Springs Area (Combs, Et Al., 1999) Steamboat Springs Area (Combs, Et Al., 1999) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Acoustic Logs At Steamboat Springs Area (Combs, Et Al., 1999) Exploration Activity Details Location Steamboat Springs Area Exploration Technique Acoustic Logs Activity Date Usefulness useful DOE-funding Unknown Notes Two other Sandia instruments were used briefly: the acoustic borehole televiewer (BHTV) yielded wellbore images down to 520';and a Sandia memory tool gave pressuretemperature data for a shut-in test at the end of the project. Because no oriented core has been collected in this field, the televiewer images giving fracture direction were extremely M.ormative, but the BHTV could not be used at greater depths because of its temperature

174

Microsoft Word - FOIA Log FY 2007.doc  

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

7 FOIA - Request Log 7 FOIA - Request Log 1 Closed/ Date No. Dated Date Rec'd HQ or Dir. Subject Finalized 02/08/07 001 10/05/06 01/08/07 Transfer from DOE- EM-CBC Copies of contract modifications, performance evaluations, task orders and task order proposals related to contract AT30-05EW03000 with Navarro Research and Engineering, Inc. Finalized 01/31/07 002 01/11/07 01/11/07 Direct For a copy of contract DE-AC04-95AL89446 for the period of September 1995 through the end of the contract. Also, if not included in the above, a copy of the special provisions for the contract specifying the role of the CTAC Program Manager as the single point of contact with DOE. Finalized 02/06/07 003 01/31/07 02/05/07 Transfer from DOE/HQ Copies of the U.S. Department of Energy's ten oldest open or pending Freedom of

175

Microsoft Word - FOIA Log FY 2005.doc  

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

5 FOIA - Request Log 5 FOIA - Request Log 1 Closed/ Date No. Dated Date Rec'd HQ or Dir. Subject Yes 02/23/05 001 02/16/05 02/16/05 Direct Copies of the 2004 Modifications to the Westinghouse TRU Solutions contract (No. DE-AC- 04-01AL66444) for the management and operation of the Waste Isolation Pilot Plant. Yes 04/12/05 002 04/11/05 04/11/05 Direct Copies of the scope of work statement for the EE&G Oversight contract for the Waste Isolation Pilot Plant, dated 1999 or 2000 Yes 04/29/05 003 04/20/05 04/20/05 Direct (1) A copy of the Winning Proposal for RFP No. DE-AC04-89AL58309 (A036), entitled Environmental Evaluation Group (EEG) Oversight Contract for the Waste Isolation Pilot Plant. Subject RFO was issued in FY 2001, and we believe the initials contract was awarded to a company named EG&G.

176

Dual excitation acoustic paramagnetic logging tool  

DOE Patents [OSTI]

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be performed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described. 6 figs.

Vail, W.B. III.

1989-02-14T23:59:59.000Z

177

Dual excitation acoustic paramagnetic logging tool  

DOE Patents [OSTI]

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in gelogical formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleous present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described.

Vail, III, William B. (Bothell, WA)

1989-01-01T23:59:59.000Z

178

Dewarless Logging Tool - 1st Generation  

SciTech Connect (OSTI)

This report focuses on Sandia National Laboratories' effort to create high-temperature logging tools for geothermal applications without the need for heat shielding. One of the mechanisms for failure in conventional downhole tools is temperature. They can only survive a limited number of hours in high temperature environments. For the first time since the evolution of integrated circuits, components are now commercially available that are qualified to 225 C with many continuing to work up to 300 C. These components are primarily based on Silicon-On-Insulator (SOI) technology. Sandia has developed and tested a simple data logger based on this technology that operates up to 300 C with a few limiting components operating to only 250 C without thermal protection. An actual well log to 240 C without shielding is discussed. The first prototype high-temperature tool measures pressure and temperature using a wire-line for power and communication. The tool is based around the HT83C51 microcontroller. A brief discussion of the background and status of the High Temperature Instrumentation program at Sandia, objectives, data logger development, and future project plans are given.

HENFLING,JOSEPH A.; NORMANN,RANDY A.

2000-08-01T23:59:59.000Z

179

AVO and anisotropy from logs and walkaways  

SciTech Connect (OSTI)

AVO (amplitude versus offset) is the seismic technique used for mapping lithology, and modeling is an important step for successful AVO interpretations. Shear velocity measurements are essential, since AVO attempts to exploit the elastic (as opposed to acoustic) nature of seismic wave propagation. A property of seismic wave propagation not often considered is anisotropy. This is probably because the magnitude of the anisotropy has been difficult to measure, and its effect on AVO is not widely known. New technology is helping to improve AVO modeling. Dipole source shear logging tools can now measure very slow shear velocities, increasing the range of applicability of AVO, and new borehole seismic techniques can measure anisotropy. When integrated, these new measurements provide more detailed information about the elastic moduli that govern wave propagation, and bring the possibility for greater reliability in AVO interpretation. Two examples of ray-trace AVO synthetics are shown to illustrate typical AVO responses and the importance of shear velocity information. An overview of anisotropy is given and a new technique to estimate anisotropy from walkaway surveys (multi-offset VSPs) is described. The log and walkaway measurements are then integrated to study the impact of anisotropy on AVO. First, the effect of anisotropy on Ostrander's shale-sand model is investigated, and second, isotropic and anisotropic ray-trace synthetics are compared. The effect of anisotropy on AVO is found to be significant and may be lead to misinterpretations of AVO anomalies.

Leaney, S.W.; Borland, W.E. (Schlumberger Geophysics Nusantara, Jakarta (Indonesia))

1994-07-01T23:59:59.000Z

180

Gamma Ray Bursts  

E-Print Network [OSTI]

Olson. Observations of gamma-ray bursts of cosmic origin. E. Lingenfelter. Gamma-ray bursts. Annual Review of652-654. Waxman, Eli. Gamma-ray-burst afterglow: supporting

Stahl, Bennett

2014-01-01T23:59:59.000Z

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


181

Green Energy Resources Inc formerly New York International Log Lumber  

Open Energy Info (EERE)

New York International Log Lumber New York International Log Lumber Company Jump to: navigation, search Name Green Energy Resources Inc (formerly New York International Log & Lumber Company) Place San Antonio, Texas Product GRGR aims to export wood fiber fuel, that is environmentally certified, to overseas power generation utilities. References Green Energy Resources Inc (formerly New York International Log & Lumber Company)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Green Energy Resources Inc (formerly New York International Log & Lumber Company) is a company located in San Antonio, Texas . References ↑ "Green Energy Resources Inc (formerly New York International Log & Lumber Company)"

182

Chemical logging- a geothermal technique | Open Energy Information  

Open Energy Info (EERE)

logging- a geothermal technique logging- a geothermal technique Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Chemical logging- a geothermal technique Details Activities (1) Areas (1) Regions (0) Abstract: Chemical logging studies conducted at the Department of Energy's Raft River Geothermal Test Site in south central Idaho resulted in the development of a technique to assist in geothermal well drilling and resource development. Calcium-alkalinity ratios plotted versus drill depth assisted in defining warm and hot water aquifers. Correlations between the calcium-alkalinity log and lithologic logs were used to determine aquifer types and detection of hot water zones 15 to 120 m before drill penetration. INEL-1 at the Idaho National Engineering Laboratory site in

183

Western tight gas sands advanced logging workshop proceedings  

SciTech Connect (OSTI)

An advanced logging research program is one major aspect of the Western Tight Sands Program. Purpose of this workshop is to help BETC define critical logging needs for tight gas sands and to allow free interchange of ideas on all aspects of the current logging research program. Sixteen papers and abstracts are included together with discussions. Separate abstracts have been prepared for the 12 papers. (DLC)

Jennings, J B; Carroll, Jr, H B [eds.

1982-04-01T23:59:59.000Z

184

Induction log analysis of thinly laminated sand/shale formation  

SciTech Connect (OSTI)

The author examines induction log responses to a thinly laminated sand/shale sequence in a deviated borehole for arbitrary deviation (or dip) angle and sand/shale composition. He found that the induction log responses in a thinly laminated sand/shale sequence are the same as they would be if the tool is placed in a homogeneous but anisotropic formation with the horizontal and vertical conductivities given respectively by the parallel and the series conductivities of the sequence. Conversely, a thinly laminated sand/shale sequence can be identified as an anisotropic formation by induction logs. He discusses three methods to identify an anisotropic formation using induction-type logs alone.

Hagiwara, T. [Shell Development Co., Houston, TX (United States)

1995-06-01T23:59:59.000Z

185

Pressure Temperature Log At Fish Lake Valley Area (DOE GTP) ...  

Open Energy Info (EERE)

Fish Lake Valley Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Fish Lake Valley Area (DOE GTP)...

186

NMOCD - Form G-105 - Geothermal Resources Well Log | Open Energy...  

Open Energy Info (EERE)

Well Log Author State of New Mexico Energy and Minerals Department Published New Mexico Oil Conservation Division, 1978 DOI Not Provided Check for DOI availability: http:...

187

Evaluation of Emerging Technology for Geothermal Drilling and Logging Applications  

Broader source: Energy.gov [DOE]

Evaluation of Emerging Technology for Geothermal Drilling and Logging Applications presentation at the April 2013 peer review meeting held in Denver, Colorado.

188

Well Log Data At North Brawley Geothermal Area (Matlick & Jayne...  

Open Energy Info (EERE)

to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Well Log Data At North Brawley Geothermal Area (Matlick & Jayne, 2008) Exploration Activity Details...

189

Pressure Temperature Log At Fort Bliss Area (DOE GTP) | Open...  

Open Energy Info (EERE)

Fort Bliss Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Fort Bliss Area (DOE GTP) Exploration...

190

Gammaray bursts  

Science Journals Connector (OSTI)

...R. Priest and N. O. Weiss Gamma-ray bursts Martin J. Rees Institute of...Road, Cambridge CB3 0HA, UK Gamma-ray bursts, an enigma for more than 25...gamma-rays|neutron stars| Gamma-ray bursts By Martin J. Rees Institute...

2000-01-01T23:59:59.000Z

191

Drag reduction in coal log pipelines  

SciTech Connect (OSTI)

It is well-known that solutions of dissolved long-chain macromolecules produce lower friction or drag losses than with the solvent alone. In coal log pipeline (CLP), water is the conveying medium. Synthetic polymers such as poly(ethylene oxide) have been dissolved in water and tested for their extent of drag reduction as a function of concentration and other variables. Lab-scale experimental results for CLP indicate substantial drag reduction at low concentration levels of polymer. But, the macromolecules exhibit degradation under mechanical shear stresses. The large molecules break into smaller units. This degradation effect causes a loss of drag reduction. However, high levels of drag reduction can be maintained as follows: (1) by injecting polymer into the CLP at several locations along the pipeline, (2) by injecting polymer of different particle sizes, (3) by using more robust types of polymers, or (4) by using polymer-fiber mixtures. This report presents the value of drag-reducing agents in terms of pumping power net cost savings. In addition, this report outlines the environmental impact of drag reduction polymers, and end-of-pipeline water treatment processes. For an operating CLP, hundreds of miles in length, the use of poly(ethylene oxide) as a drag reducing agent provides significant pumping power cost savings at a minimal materials cost.

Marrero, T.R.; Liu, H. [Univ. of Missouri, Columbia, MO (United States). Capsule Pipeline Research Center

1996-12-31T23:59:59.000Z

192

Gamma ray generator  

DOE Patents [OSTI]

An embodiment of a gamma ray generator includes a neutron generator and a moderator. The moderator is coupled to the neutron generator. The moderator includes a neutron capture material. In operation, the neutron generator produces neutrons and the neutron capture material captures at least some of the neutrons to produces gamma rays. An application of the gamma ray generator is as a source of gamma rays for calibration of gamma ray detectors.

Firestone, Richard B; Reijonen, Jani

2014-05-27T23:59:59.000Z

193

Film Badge Application Radioactive Material Package Receipt Log  

E-Print Network [OSTI]

;RADIOACTIVE MATERIAL PACKAGE RECEIPT LOG DATE: DELIVERED BY: AUTHORIZED BY: Contamination Check DPM/100 cm2APPENDIX A Film Badge Application Radioactive Material Package Receipt Log Radioactive Material Package Receipt Form (Off-Campus Locations) Radiation / Contamination Survey Form #12;PERSONNEL MONITORING

Slatton, Clint

194

Synthetic logs generator for fraud detection in mobile transfer services  

E-Print Network [OSTI]

Synthetic logs generator for fraud detection in mobile transfer services Chrystel Gaber, Baptiste to commit crimes and avoid detection, research in the field of fraud is always evolving. However, trans synthetic logs with real ones. I. INTRODUCTION Frauds in the field of electronic payment evolve contin

Paris-Sud XI, Université de

195

LLNL CATEGORICAL EXCLUSION DETERMINATION FORM ESPD LOG No: !ESH-EFA-NEPA-12-26401  

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

CATEGORICAL EXCLUSION DETERMINATION FORM CATEGORICAL EXCLUSION DETERMINATION FORM ESPD LOG No: !ESH-EFA-NEPA-12-26401 I NNSA/LSO LoG No: !NA-12-2~ 1. PROJECT/ACTIVITY TITLE: RADIOGRAPHY OF EXPLOSIVE SAMPLES 8321 C 2. PROJECT DESCRIPTION: I DATE: 8/13/2012 This proposed project would use existing radiography systems located in B321 C to provide useful, non-destntctive, three dimensional imaging and characterization of explosive samples. Current B321 C operations include non- destructive evaluations of up to 10 mg of explosive samples. Storage and use of explosives are controlled to ensure that the facility limits are within the definitions of a LSI hazard classification. The total building inventory of explosives shall not exceed 200 grams for all types of explosives except for Hazard Division 1.4S materials meeting the conditions stated below. The room inventoty

196

LLNL CATEGORICAL EXCLUSION DETERMINATION FORM ESPD LOG No: !ESH-EFA-NEPA-12-26401  

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

CATEGORICAL EXCLUSION DETERMINATION FORM CATEGORICAL EXCLUSION DETERMINATION FORM ESPD LOG No: !ESH-EFA-NEPA-12-26401 I NNSA/LSO LoG No: !NA-12-2~ 1. PROJECT/ACTIVITY TITLE: RADIOGRAPHY OF EXPLOSIVE SAMPLES 8321 C 2. PROJECT DESCRIPTION: I DATE: 8/13/2012 This proposed project would use existing radiography systems located in B321 C to provide useful, non-destntctive, three dimensional imaging and characterization of explosive samples. Current B321 C operations include non- destructive evaluations of up to 10 mg of explosive samples. Storage and use of explosives are controlled to ensure that the facility limits are within the definitions of a LSI hazard classification. The total building inventory of explosives shall not exceed 200 grams for all types of explosives except for Hazard Division 1.4S materials meeting the conditions stated below. The room inventoty

197

Log Homes in REScheck | Building Energy Codes Program  

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

Log Homes in REScheck Log Homes in REScheck This training includes an introduction to how log homes are handled in the REScheck(tm) software and demonstrates how to show compliance for log homes using REScheck. Estimated Length: 56 minutes Presenters: Rob Picket, Log Homes Council Heather Dillon and Pam Cole, Pacific Northwest National Laboratory Original Webcast Date: Thursday, February 16, 2006 - 13:00 CEUs Offered: 1.0 AIA/CES LU (HSW); .10 CEUs towards ICC renewal certification. Course Type: Video Downloads: Presentation Slides Video Watch on YouTube Visit the BECP Online Training Center for instructions on how to obtain a certificate of completion. Building Type: Residential Focus: Compliance Code Version: International Energy Conservation Code (IECC) Software: REScheck Target Audience:

198

COMPUTATIONAL IMAGING Berthold K.P. Horn  

E-Print Network [OSTI]

Ziock, and Lorenzo Fabris. #12;Coded Aperture Imaging · Can't refract or reflect gamma rays · Pinhole Principle #12;Decoding Method Rationale #12;Coded Aperture Imaging · Can't refract or reflect gamma rays Squares Match in FT #12;Polystyrene Micro Beads (1µm) #12;#12;(2) CODED APERTURE IMAGING · Can't refract

Treuille, Adrien

199

THE EFFECT OF RADON TRANSPORT IN GROUNDWATER UPON GAMMA-RAY BOREHOLE LOGS  

E-Print Network [OSTI]

Estimation of the Lung Tissue Dose from Inhalation of Radon and Daughters," Health Physics 10, 1137 Federal Radiation

Nelson, P.H.

2010-01-01T23:59:59.000Z

200

Using the negative log-gamma distribution for Bayesian system reliability assessment.  

E-Print Network [OSTI]

??Modeling system reliability over time when binary data are collected both at the system and component level has been the subject of many papers. In (more)

Zoh, Roger

2012-01-01T23:59:59.000Z

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


201

Time encoded radiation imaging  

DOE Patents [OSTI]

The various technologies presented herein relate to detecting nuclear material at a large stand-off distance. An imaging system is presented which can detect nuclear material by utilizing time encoded imaging relating to maximum and minimum radiation particle counts rates. The imaging system is integrated with a data acquisition system that can utilize variations in photon pulse shape to discriminate between neutron and gamma-ray interactions. Modulation in the detected neutron count rates as a function of the angular orientation of the detector due to attenuation of neighboring detectors is utilized to reconstruct the neutron source distribution over 360 degrees around the imaging system. Neutrons (e.g., fast neutrons) and/or gamma-rays are incident upon scintillation material in the imager, the photons generated by the scintillation material are converted to electrical energy from which the respective neutrons/gamma rays can be determined and, accordingly, a direction to, and the location of, a radiation source identified.

Marleau, Peter; Brubaker, Erik; Kiff, Scott

2014-10-21T23:59:59.000Z

202

Observations of cosmic gamma ray sources and their contribution to the diffuse gamma ray background  

SciTech Connect (OSTI)

The objective is to study soft gamma ray emission in the 0.1 to 10 MeV energy band for selected active galactic nuclei and explore how much they contribute to the total diffuse gamma ray background. A series of imaging observations of extragalactic objects in the low energy gamma-ray region were carried out by the Coded Aperture Directional Gamma-ray Telescope (DGT). The DGT was successfully flown at stratospheric balloon altitudes, and observations were made of the Crab, NGC 1275, MKN 421, and NGC 4151. The measured Crab spectrum is consistent with a featureless power-law of the form. Significant emission was detected up to 500 keV from the Seyfert galaxy, NGC 4151. To increase the total sky exposure the extragalactic field images were analyzed, including the 3C 273 region, obtained by the DGT.

Bhattacharya, D.

1990-01-01T23:59:59.000Z

203

E-Print Network 3.0 - aided collimation gamma Sample Search Results  

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

computer simulations that the ... Source: Arizona, University of - Center for Gamma-Ray Imaging Collection: Engineering ; Biology and Medicine 5 Preliminary Design Notes for...

204

Geothermal well log interpretation state of the art. Final report  

SciTech Connect (OSTI)

An in-depth study of the state of the art in Geothermal Well Log Interpretation has been made encompassing case histories, technical papers, computerized literature searches, and actual processing of geothermal wells from New Mexico, Idaho, and California. A classification scheme of geothermal reservoir types was defined which distinguishes fluid phase and temperature, lithology, geologic province, pore geometry, salinity, and fluid chemistry. Major deficiencies of Geothermal Well Log Interpretation are defined and discussed with recommendations of possible solutions or research for solutions. The Geothermal Well Log Interpretation study and report has concentrated primarily on Western US reservoirs. Geopressured geothermal reservoirs are not considered.

Sanyal, S.K.; Wells, L.E.; Bickham, R.E.

1980-01-01T23:59:59.000Z

205

Acoustic Logs At Coso Geothermal Area (1977) | Open Energy Information  

Open Energy Info (EERE)

Coso Geothermal Area (1977) Coso Geothermal Area (1977) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Acoustic Logs At Coso Geothermal Area (1977) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Acoustic Logs Activity Date 1977 Usefulness not indicated DOE-funding Unknown Notes Acoustic logs indicate fractured rock and potentially permeable zones. References Galbraith, R. M. (1 May 1978) Geological and geophysical analysis of Coso Geothermal Exploration Hole No. 1 (CGEH-1), Coso Hot Springs KGRA, California Goranson, C.; Schroeder, R. (1 June 1978) Static downhole characteristics of well CGEH-1 at Coso Hot Springs, China Lake, California Retrieved from "http://en.openei.org/w/index.php?title=Acoustic_Logs_At_Coso_Geothermal_Area_(1977)&oldid=510216"

206

Well Logging Security Initiatives | Y-12 National Security Complex  

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

by this browser. Download video Captions: On Watch as GTRI demonstrates the threat to the security of (oil) well logging systems and outlines the initiatives that are enhancing the...

207

Lightweight Indexing of Observational Data in Log-Structured Storage  

E-Print Network [OSTI]

with similar properties, such as process monitoring in manufacturing. 1. INTRODUCTION Humankind has a rapidly-store) is amenable to han- dling such write-intensive scenarios. A log-store appends newly arrived data to the end

Ooi, Beng Chin

208

TRUTH & CONSEQUENCES... LOG 437/537: MODEL-THEORETIC SEMANTICS  

E-Print Network [OSTI]

TRUTH & CONSEQUENCES... LOG 437/537: MODEL-THEORETIC SEMANTICS Spring 2013, TT 11:45am-1:00pm Dr and compactness of first-order logic and introduce along the way the basic notions of structure, truth

Liu, Paul

209

Determination of lithology from well logs using a neural network  

SciTech Connect (OSTI)

The authors have developed a computer program to automatically determine lithologies from well logs using a back-propagation neural network. Unlike a conventional serial computer, a neural network is a computational system composed of nodes (sometimes called neurons, neurodes, or units) and the connections between these nodes. Neural computing attempts to emulate the functions of the mammalian brain, thus mimicking thought processes. The neural network approach differs from previous pattern recognition methods in its ability to learn from examples. Unlike conventional statistical methods, this new approach does not require sophisticated mathematics and a large amount of statistical data. This paper discusses the application of neural networks to a pattern recognition problem in geology: the determination of lithology from well logs. The neural network determined the lithologies (limestone, dolomite, sandstone, shale, sandy and dolomitic limestones, sandy dolomite, and shale sandstone) from selected well logs in a fraction of the time required by an experienced human log analyst.

Rogers, S.J.; Fang, J.H. (Univ. of Alabama, Tuscaloosa (United States)); Karr, C.L.; Stanley, D.A. (Bureau of Mines, Tuscaloosa, AL (United States))

1992-05-01T23:59:59.000Z

210

Heuristic search method for optimal zonation of well logs  

SciTech Connect (OSTI)

Optimal zonation of well-log data, that is, determining an optimal number of major segments such as waveforms in a log, may be achieved by employing a criterion of minimum variance (within a segment) and a heuristic search of potential boundary (link) points of digitized log data. This new method is based on an algorithm originally devised by D.M. Hawkins and D.F. Merriam in 1973. Their method can be improved by introducing a heuristic search procedure, thereby decreasing computer time by 7- to 50-fold, depending on the number of data points and configuration of the logs. Time saving is proportional to the size of the data set. Three examples - one hypothetical and two real-are used to illustrate the modification of the Hawkins and Merriam algorithm.

Chen, H.C.; Fang, J.H.

1986-07-01T23:59:59.000Z

211

Logging, Testing and Monitoring Geothermal Wells | Open Energy Information  

Open Energy Info (EERE)

Logging, Testing and Monitoring Geothermal Wells Logging, Testing and Monitoring Geothermal Wells Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Logging, Testing and Monitoring Geothermal Wells Abstract Wells or boreholes are essential components in both geothermal research and utilization as they enable a drastic increase in geothermal energy production beyond natural out-flow as well as providing access deep into the systems, not otherwise possible. Wells also play a vital role in all geothermal reservoir physics (also called reservoir engineering) research, which would be particularly ineffec-tive without the access into geothermal systems provided by wells. During drilling the main reservoir physics research is performed through logging of different parameters as functions

212

Fluid-Rock Characterization and Interactions in NMR Well Logging  

SciTech Connect (OSTI)

The objective of this project was to characterize the fluid properties and fluid-rock interactions which are needed for formation evaluation by NMR well logging. NMR well logging is finding wide use in formation evaluation. The formation parameters commonly estimated were porosity, permeability, and capillary bound water. Special cases include estimation of oil viscosity, residual oil saturation, location of oil/water contact, and interpretation on whether the hydrocarbon is oil or gas.

Hirasaki, George J.; Mohanty, Kishore K.

2003-02-10T23:59:59.000Z

213

Characterization of gas hydrate reservoirs by integration of core and log data in the Ulleung Basin, East Sea  

Science Journals Connector (OSTI)

Abstract Examinations of core and well-log data from the Second Ulleung Basin Gas Hydrate Drilling Expedition (UBGH2) drill sites suggest that Sites UBGH2-2_2 and UBGH2-6 have relatively good gas hydrate reservoir quality in terms of individual and total cumulative thicknesses of gas-hydrate-bearing sand (HYBS) beds. In both of the sites, core sediments are generally dominated by hemipelagic muds which are intercalated with turbidite sands. The turbidite sands are usually thin-to-medium bedded and mainly consist of well sorted coarse silt to fine sand. Anomalies in infrared core temperatures and porewater chlorinity data and pressure core measurements indicate that gas hydrate occurrence zones (GHOZ) are present about 68155mbsf at Site UBGH2-2_2 and 110155mbsf at Site UBGH2-6. In both the GHOZ, gas hydrates are preferentially associated with many of the turbidite sands as pore-filling type hydrates. The HYBS identified in the cores from Site UBGH2-6 are medium-to-thick bedded particularly in the lower part of the GHOZ and well coincident with significant high excursions in all of the resistivity, density, and velocity logs. Gas-hydrate saturations in the HYBS range from 12% to 79% with an average of 52% based on pore-water chlorinity. In contrast, the HYBS from Site UBGH2-2_2 are usually thin-bedded and show poor correlations with both of the resistivity and velocity logs owing to volume averaging effects of the logging tools on the thin HYBS beds. Gas-hydrate saturations in the HYBS range from 15% to 65% with an average of 37% based on pore-water chlorinity. In both of the sites, large fluctuations in biogenic opal contents have significant effects on the sediment physical properties, resulting in limited usage of gamma ray and density logs in discriminating sand reservoirs.

J.-J. Bahk; G.-Y. Kim; J.-H. Chun; J.-H. Kim; J.Y. Lee; B.-J. Ryu; J.-H. Lee; B.-K. Son; T.S. Collett

2013-01-01T23:59:59.000Z

214

Two-level expert system for well-log correlation  

SciTech Connect (OSTI)

One limitation of conventional (either manual or machine) well-log correlation is that correlation loops do not close; that is, different correlations result depending on the order in which logs are matched. The authors have devised a two-level expert system for a well-log correlation which addresses this nonclosure problem. The first level of the expert system uses heuristic rules to determine zone attributes and degree of matching. The zones or segments of logs are predetermined either by eye or by any zonation algorithm. The second level of the system deals with machine learning and dynamic programming (an optimization technique that uses recursion to find best matches). A set of optimal weights is obtained through machine learning. These weights subsequently will be used in a dynamic programming technique. Training sets for machine learning are selected to reflect geologic settings of the region. Dynamic programming is then used to match the individual zones of logs, which may exhibit gaps, repetitions, and/or thickening-thinning. Five examples having the following features will be illustrated in the poster session: anticline, unconformity, reverse fault, normal fault with an anticline, and growth fault. The first four are made up of synthetic logs, and the fifth is a real-world example of a Gulf Coast growth fault having an extra layer on the downthrown side.

Mahmoud, W.; Chen, H.C.; Shultz, A.W.; Fang, J.H.

1989-03-01T23:59:59.000Z

215

XLOGS: An expert system for environmental interpretation of wireline logs  

SciTech Connect (OSTI)

Wireline logs provide information on vertical sequences that can be useful for preliminary interpretation of depositional environments. Although the specific causes of any log response are related to many factors, including lithology, density, and pore fluid, geologists often can gain a general impression of vertical heterogeneity, cyclicity, and gradation without performing a rigorous petrophysical analysis of log responses. The authors have attempted to model these heuristics of well logs in a computer program - XLOGS - that emphasizes pattern recognition and fuzzy logic. XLOGS begins with segmentation of a given digitized log in interactive graphical mode. Next, the log shape is characterized by comparison with a set of type motifs, such as straight, serrated, funnel, and bell shapes. Shapes are described in terms of numerical attributes such as amplitude and slope. By using fuzzy values to express membership, any shape can be described. Related subenvironments can be recognized from characteristic vertical sequences, such as the upward-coarsening prograding delta lobe that produces a funnel-shaped mouth-bar segment above a straight to serrated prodelta segment. Variability in the depth scale is accommodated by iterative segmentation; trials with coarser or finer segmentation can be evaluated as alternative interpretations for distinguishing sequence and parasequence boundaries.

Shultz, A.W.; Fang, J.H.; Chen, H.C. (Univ. of Alabama, Tuscaloosa (United States))

1991-03-01T23:59:59.000Z

216

BazookaSPECT: A Low-Cost Approach to High-Resolution, Single-Photon Imaging Using Columnar Scintillators and Image Intensifiers  

E-Print Network [OSTI]

-photon counting gamma-ray detector based on an image intensifier optically coupled to a low-cost CCD. Typically and allowing for a customizable imaging system. Operating in photon-counting mode, individual gamma-ray functioning as a gamma-ray microscope, (b) white-light microscope image of four 111 In oxine source beads, (c

Arizona, University of

217

Data Compendium for the Logging Test Pits at the ERDA Grand Junction...  

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

Data Compendium for the Logging Test Pits at the ERDA Grand Junction Compound (December 1975) Data Compendium for the Logging Test Pits at the ERDA Grand Junction Compound...

218

2238 IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 51, NO. 5, OCTOBER 2004 Large Area Imaging Detector for Long-Range,  

E-Print Network [OSTI]

imager to detect nuclear materials at distances of 100 m. Index Terms--Coded aperture imager, gamma-ray problems, the advantages of imaging and the construction of a prototype, large-area (0.57 m2) gamma-ray detectors, gamma-ray imagers, radiation source search. I. INTRODUCTION NUCLEAR material cannot be detected

Horn, Berthold K.P.

219

An expert system advisor for well log quality control  

E-Print Network [OSTI]

Taxonomy for the Sonic Iog C2 Taxonomy for the Gamma Ray lcg C3 Taxonomy for the Dual Induction Iog . Dl Gamma Ray Inf~ Trees . D2 Gamma Ray Inference Trees (Cont. ) D 3 Gamma Ray Inference Trees (Cont. ) D4 Dual Induction Inference Trees D5 Dual... FOR WELL IOG QUALITY CONTROL 17 OB3ECZIVFK SYSTEM DEVEIOFKENT 17 19 SUMMARY DISCUSSION SUGGESTIONS FOR FVHBK RESEARCH 31 33 41 APPENDIX A ? GIOSSARY OF ~ SYSTEM TERMINOIOGY . . 44 APPENDIX B ? AN ~ CONSULTATION SESSION WITH THE SONIC IOG...

Warnken, Dean Kennedy

2012-06-07T23:59:59.000Z

220

Neutrinos from Gamma Ray Bursts  

Science Journals Connector (OSTI)

The observed fluxes of cosmic rays and gamma rays are used to infer the maximum allowed high-energy neutrino flux allowed for Gamma Ray Bursts (GRBs) following Reference [1]. It is shown that if GRBs produce the ultrahigh-energy cosmic rays they should contribute (a) at least 10% of the extragalactic gamma ray background between 3 MeV and 30 GeV contrary to their observed energy flux which is only a minute fraction of this flux and (b) a cumulative neutrino flux a factor of 20 below the AMANDA-?2000 limit on isotropic neutrinos. This could have two implications either GRBs do not produce the ultrahigh energy cosmic rays [2 3] or that the GRBs are strongly beamed and emit most of their power at energies well above 100 GeV [4] implausibly increasing the energy requirements but consistent with the marginal detections of a few low-redshift GRBs by MILAGRITO [5] HEGRA-AIROBICC [6] and the Tibet-Array [7]. All crucial measurements to test the models will be available in the next few years. These are measurements of (i) high-energy neutrinos with AMANDA-ICECUBE or an enlarged ANTARES/NESTOR ocean detector (ii) GRB redshifts from HETE-2 follow-up studies and (iii) GRB spectra above 10 GeV with low-threshold imaging air Cherenkov telescopes such as MAGIC and the space telescopes AGILE and GLAST.

Karl Mannheim

2001-01-01T23:59:59.000Z

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


221

Neutrinos from Gamma Ray Bursts  

E-Print Network [OSTI]

The observed fluxes of cosmic rays and gamma rays are used to infer the maximum allowed high-energy neutrino flux allowed for Gamma Ray Bursts (GRBs), following Mannheim, Protheroe, and Rachen (2000). It is shown that if GRBs produce the ultrahigh-energy cosmic rays, they should contribute (a) at least 10% of the extragalactic gamma ray background between 3 MeV and 30 GeV, contrary to their observed energy flux which is only a minute fraction of this flux, and (b) a cumulative neutrino flux a factor of 20 below the AMANDA (Neutrino 2000) limit on isotropic neutrinos. This could have two implications, either GRBs do not produce the ultrahigh energy cosmic rays or that the GRBs are strongly beamed and emit most of their power at energies well above 100 GeV implausibly increasing the energy requirements, but consistent with the marginal detections of a few low-redshift GRBs by MILAGRITO, HEGRA-AIROBICC, and the Tibet-Array. All crucial measurements to test the models will be available in the next few years. These are measurements of (i) high-energy neutrinos with AMANDA-ICECUBE or an enlarged ANTARES/NESTOR ocean detector, (ii) GRB redshifts from HETE-2 follow-up studies, and (iii) GRB spectra above 10 GeV with low-threshold imaging air Cherenkov telescopes such as MAGIC and the space telescopes AGILE and GLAST.

Karl Mannheim

2000-10-18T23:59:59.000Z

222

Biomedical Instrumentation and Imaging at TJNAF | U.S. DOE Office...  

Office of Science (SC) Website

for cancer, including breast (scintimammography, positron emission mammography), brain and heart imaging and 2) high resolution, high sensitivity gamma imaging of small...

223

Gamma Ray Bursts Sudden, intense flashes of gamma rays  

E-Print Network [OSTI]

Gamma Ray Bursts #12;The Case Sudden, intense flashes of gamma rays come from nowhere and disappear with out a trace. Incredibly powerful: A single gamma ray burst is hundreds of times brighter a supernova #12;Who Vela (1960's) Looking for arms testing, found gamma ray bursts Compton Gamma Ray Observatory

Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group

224

Blazar Duty-Cycle at gamma-ray Frequecies: Constraints from Extragalactic Background Radiation and Prospects for AGILE and GLAST  

E-Print Network [OSTI]

We take into account the constraints from the observed extragalactic gamma-ray background to estimate the maximum duty cycle allowed for a selected sample of WMAP Blazars, in order to be detectable by AGILE and GLAST gamma-ray experiments. For the nominal sensitivity values of both instruments, we identify a subset of sources which can in principle be detectable also in a steady state without over-predicting the extragalactic background. This work is based on the results of a recently derived Blazar radio LogN-LogS obtained by combining several multi-frequency surveys.

Pittori, Carlotta; Colafrancesco, Sergio; Giommi, Paolo

2007-01-01T23:59:59.000Z

225

Blazar Duty-Cycle at gamma-ray Frequecies: Constraints from Extragalactic Background Radiation and Prospects for AGILE and GLAST  

E-Print Network [OSTI]

We take into account the constraints from the observed extragalactic gamma-ray background to estimate the maximum duty cycle allowed for a selected sample of WMAP Blazars, in order to be detectable by AGILE and GLAST gamma-ray experiments. For the nominal sensitivity values of both instruments, we identify a subset of sources which can in principle be detectable also in a steady state without over-predicting the extragalactic background. This work is based on the results of a recently derived Blazar radio LogN-LogS obtained by combining several multi-frequency surveys.

Carlotta Pittori; Elisabetta Cavazzuti; Sergio Colafrancesco; Paolo Giommi

2007-05-04T23:59:59.000Z

226

Gamma ray burst positrons  

Science Journals Connector (OSTI)

The international network of gamma ray burst detectors has provided redundant localizations for six gamma ray bursts with accuracies in the arcminute range. Catalog radio soft X?ray and optical searches have been performed for some of these events. The results of these searches are reviewed. Although radio X?ray and optical candidates are found in the error boxes no clear association between gamma ray bursts and other forms of emission has emerged to date. Optical radio searches are continuing.

K. Hurley

1982-01-01T23:59:59.000Z

227

Connect & Log In | Argonne Leadership Computing Facility  

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

Account Information Accounts and Access FAQ Connect & Log In Using CRYPTOCards SSH Keys on Surveyor Disk Space Quota Management Allocations Decommissioning of BG/P Systems and Resources Blue Gene/Q Versus Blue Gene/P Mira/Cetus/Vesta Intrepid/Challenger/Surveyor Tukey Eureka / Gadzooks Policies Documentation Feedback Please provide feedback to help guide us as we continue to build documentation for our new computing resource. [Feedback Form] Connect & Log In Users log into ALCF resources via ssh. ssh mira.alcf.anl.gov -l Resources that are accessible via ssh are vesta.alcf.anl.gov, mira.alcf.anl.gov, surveyor.alcf.anl.gov, intrepid.alcf.anl.gov, cetus.alcf.anl.gov, challenger.alcf.anl.gov, tukey.alcf.anl.gov, eureka.alcf.anl.gov, and gadzooks.alcf.anl.gov.

228

Acoustic Logs At Raft River Geothermal Area (1979) | Open Energy  

Open Energy Info (EERE)

Raft River Geothermal Area (1979) Raft River Geothermal Area (1979) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Acoustic Logs Activity Date 1979 Usefulness useful DOE-funding Unknown Exploration Basis To permit the lateral and vertical extrapolation of core and test data and bridged the gap between surface geophysical data and core analyses. Notes Televiewer logs permitted the location and orientation of numerous fractures and several features that may be faults. References Keys, W. S.; Sullivan, J. K. (1 June 1979) Role of borehole geophysics in defining the physical characteristics of the Raft River geothermal reservoir, Idaho Retrieved from "http://en.openei.org/w/index.php?title=Acoustic_Logs_At_Raft_River_Geothermal_Area_(1979)&oldid=473816"

229

Multi-rate flowing Wellbore electric conductivity logging method  

SciTech Connect (OSTI)

The flowing wellbore electric conductivity logging method involves the replacement of wellbore water by de-ionized or constant-salinity water, followed by constant pumping with rate Q, during which a series of fluid electric conductivity logs are taken. The logs can be analyzed to identify depth locations of inflow, and evaluate the transmissivity and electric conductivity (salinity) of the fluid at each inflow point. The present paper proposes the use of the method with two or more pumping rates. In particular it is recommended that the method be applied three times with pumping rates Q, Q /2, and 2Q. Then a combined analysis of the multi-rate data allows an efficient means of determining transmissivity and salinity values of all inflow points along a well with a confidence measure, as well as their inherent or far-field pressure heads. The method is illustrated by a practical example.

Tsang, Chin-Fu; Doughty, Christine

2003-04-22T23:59:59.000Z

230

VerSum: Verifiable Computations over Large Public Logs Jelle van den Hooff  

E-Print Network [OSTI]

blockchains, or a Certificate Transparency log. VERSUM clients ensure that the output is correct by comparing

Gummadi, Ramakrishna

231

Log-periodic oscillations of transverse momentum distributions  

E-Print Network [OSTI]

Large p_T transverse momentum distributions exhibit apparently a power-like behavior. We argue that, under closer inspection, this behavior is in fact decorated with some log-periodic oscillations. Assuming that this is genuine effect and not experimental artefact, it suggests that either the exponent of the power-like behavior is in reality complex number or that there is a scale parameter which exhibits specific log-eriodic oscillations. This problem is discussed using Tsallis distributions with scale parameter being a temperature T. At this stage we consider both possibilities on equal footing.

Grzegorz Wilk; Zbigniew Wlodarczyk

2014-03-14T23:59:59.000Z

232

Gamma ray bursts  

Science Journals Connector (OSTI)

The time histories size spectrum spatial distribution and repetition rates of gamma ray bursts are reviewed briefly. Evidence for a neutron star origin for gamma ray bursts may be found in many of these aspects of bursters. New results from optical searches are described. Substantial progress has been made recently in the optical identificaiton of the 1978 November 19 burst.

K. Hurley

1983-01-01T23:59:59.000Z

233

Directional gamma detector  

DOE Patents [OSTI]

An improved directional gamma radiation detector has a collector sandwiched etween two layers of insulation of varying thicknesses. The collector and insulation layers are contained within an evacuated casing, or emitter, which releases electrons upon exposure to gamma radiation. Delayed electrons and electrons entering the collector at oblique angles are attenuated as they pass through the insulation layers on route to the collector.

LeVert, Francis E. (Downers Grove, Knoxville, TN); Cox, Samson A. (Downers Grove, IL)

1981-01-01T23:59:59.000Z

234

Synthetic logs generator for fraud detection in mobile transfer services  

E-Print Network [OSTI]

Synthetic logs generator for fraud detection in mobile transfer services C. Gaber12 , B. Hemery2.gaber,mohammed.achemlal}@orange.com Abstract. This article presents a simulator which generates synthetic data for fraud detection. It models fraudsters and legitimate users. Keywords: synthetic data, simulation, fraud detection Mobile payments become

Boyer, Edmond

235

Ethics, Logs and Videotape: Ethics in Large Scale User Trials  

E-Print Network [OSTI]

Ethics, Logs and Videotape: Ethics in Large Scale User Trials and User Generated Content Abstract ethical responsibilities we have towards participants. This workshop brings together researchers to discuss the ethical issues of running large-scale user trials, and to provide guidance for future research

Paris-Sud XI, Université de

236

Subsistence Halibut Community Harvest Log Page 1 of 4  

E-Print Network [OSTI]

-0512, Expiration date: 07/31/2014 Subsistence Halibut Community Harvest Permit (CHP) Log U.S. Dept of Commerce-1668 Telephone: 1-800-304-4846 FAX: 907-586-7354 BLOCK A ­ CHP COORDINATOR 1. Name of CHP Coordinator 2. Signature of CHP Coordinator BLOCK B -- SUBSISTENCE FISHER IDENTIFICATION 1. Name of Fisher (First, Middle

237

Borehole logging for uranium by measurement of natural ?-radiation  

Science Journals Connector (OSTI)

?-Ray measurements have been made in boreholes since 1939, for the purpose of detecting the radiation from naturally occuring radioelements in rocks. Logs of the ?-radiation in boreholes have evolved to their present acceptance as a quantitative measurement of uranium concentration for uranium exploration and mining development projects. Many factors influence these ?-ray measurements and consequently new methods of overcoming previous problems have had to be developed. Calibration facilities with model holes have been established in several countries to support quantitative borehole measurements. New high density detector materials have been evaluated and have shown to yield considerable improvements for operation in the restricted environment of the borehole. ?-Ray spectral logging has become available partially as a result of spin-off from parallel developments in surface and airborne ?-ray spectrometric survey equipment. The use of the high resolution solid state detector has proceeded through a series of developments to its present availability as a commercial borehole logging service in spite of the inherent detector cooling problems. Digital measurements are replacing the earlier analog measurements, and minicomputer- or micro processor-based logging systems have enabled new data processing techniques such as inverse filtering, to be implemented in real time at the site of the borehole.

P.G. Killeen

1983-01-01T23:59:59.000Z

238

Dataset Descriptions and Results Various StatLog partners  

E-Print Network [OSTI]

9 Dataset Descriptions and Results Various StatLog partners See Appendix C for a full list 1 9.1 INTRODUCTION We group the dataset results according to domain type, although this distinction is perhaps arbitrary at times. There are three credit datasets, of which two follow in the next section; the third

Taylor, Charles C.

239

Fluid-Rock Characterization and Interactions in NMR Well Logging  

SciTech Connect (OSTI)

The objective of this report is to characterize the fluid properties and fluid-rock interactions that are needed for formation evaluation by NMR well logging. The advances made in the understanding of NMR fluid properties are summarized in a chapter written for an AAPG book on NMR well logging. This includes live oils, viscous oils, natural gas mixtures, and the relation between relaxation time and diffusivity. Oil based drilling fluids can have an adverse effect on NMR well logging if it alters the wettability of the formation. The effect of various surfactants on wettability and surface relaxivity are evaluated for silica sand. The relation between the relaxation time and diffusivity distinguishes the response of brine, oil, and gas in a NMR well log. A new NMR pulse sequence in the presence of a field gradient and a new inversion technique enables the T{sub 2} and diffusivity distributions to be displayed as a two-dimensional map. The objectives of pore morphology and rock characterization are to identify vug connectivity by using X-ray CT scan, and to improve NMR permeability correlation. Improved estimation of permeability from NMR response is possible by using estimated tortuosity as a parameter to interpolate between two existing permeability models.

George J. Hirasaki; Kishore K. Mohanty

2005-09-05T23:59:59.000Z

240

Optical gamma thermometer  

DOE Patents [OSTI]

An optical gamma thermometer includes a metal mass having a temperature proportional to a gamma flux within a core of a nuclear reactor, and an optical fiber cable for measuring the temperature of the heated metal mass. The temperature of the heated mass may be measured by using one or more fiber grating structures and/or by using scattering techniques, such as Raman, Brillouin, and the like. The optical gamma thermometer may be used in conjunction with a conventional reactor heat balance to calibrate the local power range monitors over their useful in-service life. The optical gamma thermometer occupies much less space within the in-core instrument tube and costs much less than the conventional gamma thermometer.

Koster, Glen Peter; Xia, Hua; Lee, Boon Kwee

2013-08-06T23:59:59.000Z

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


241

Gamma-ray binaries  

E-Print Network [OSTI]

Recent observations have shown that some compact stellar binaries radiate the highest energy light in the universe. The challenge has been to determine the nature of the compact object and whether the very high energy gamma-rays are ultimately powered by pulsar winds or relativistic jets. Multiwavelength observations have shown that one of the three gamma-ray binaries known so far, PSR B1259-63, is a neutron star binary and that the very energetic gamma-rays from this source and from another gamma-ray binary, LS I +61 303, may be produced by the interaction of pulsar winds with the wind from the companion star. At this time it is an open question whether the third gamma-ray binary, LS 5039, is also powered by a pulsar wind or a microquasar jet, where relativistic particles in collimated jets would boost the energy of the wind from the stellar companion to TeV energies.

I. F. Mirabel

2006-10-24T23:59:59.000Z

242

SuperAGILE and Gamma Ray Bursts  

SciTech Connect (OSTI)

The solid-state hard X-ray imager of AGILE gamma-ray mission -- SuperAGILE -- has a six arcmin on-axis angular resolution in the 15-45 keV range, a field of view in excess of 1 steradian. The instrument is very light: 5 kg only. It is equipped with an on-board self triggering logic, image deconvolution, and it is able to transmit the coordinates of a GRB to the ground in real-time through the ORBCOMM constellation of satellites. Photon by photon Scientific Data are sent to the Malindi ground station at every contact. In this paper we review the performance of the SuperAGILE experiment (scheduled for a launch in the middle of 2006), after its first onground calibrations, and show the perspectives for Gamma Ray Bursts.

Pacciani, Luigi; Costa, Enrico; Del Monte, Ettore; Donnarumma, Immacolata; Evangelista, Yuri; Feroci, Marco; Frutti, Massimo; Lazzarotto, Francesco; Lapshov, Igor; Rubini, Alda; Soffitta, Paolo; Tavani, Marco [IASF-INAF Rome (Italy); Barbiellini, Guido [INFN Trieste (Italy); Mastropietro, Marcello [CNR Montelibretti (Italy); Morelli, Ennio [IASF-INAF-Bologna (Italy); Rapisarda, Massimo [ENEA Frascati (Italy)

2006-05-19T23:59:59.000Z

243

Jefferson Lab's Detector Group builds small-animal imaging device...  

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

March Smith Mark Smith, Detector Group Biomedical Imaging Physicist and project manager for this effort, holds the tungsten box encasing the detector head for the mini gamma camera...

244

Gamma-ray Astronomy  

E-Print Network [OSTI]

The relevance of gamma-ray astronomy to the search for the origin of the galactic and, to a lesser extent, the ultra-high-energy cosmic rays has long been recognised. The current renaissance in the TeV gamma-ray field has resulted in a wealth of new data on galactic and extragalactic particle accelerators, and almost all the new results in this field were presented at the recent International Cosmic Ray Conference (ICRC). Here I summarise the 175 papers submitted on the topic of gamma-ray astronomy to the 30th ICRC in Merida, Mexico in July 2007.

Jim Hinton

2007-12-20T23:59:59.000Z

245

Well Log Techniques At Coso Geothermal Area (1985) | Open Energy  

Open Energy Info (EERE)

Coso Geothermal Area (1985) Coso Geothermal Area (1985) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Well Log Techniques Activity Date 1985 Usefulness not indicated DOE-funding Unknown Exploration Basis Impact of long term testing on the well pressure Notes The downhole pressure monitoring equipment for each well included a stainless steel pressure chamber attached to a 0.25 inch stainless steel capillary tubing. The surface end of the capillary tubing was connected to a Paroscientific quartz pressure trandsducer. References Sanyal, S.; Menzies, A.; Granados, E.; Sugine, S.; Gentner, R. (20 January 1987) Long-Term Testing of Geothermal Wells in the Coso Hot Springs KGRA Retrieved from "http://en.openei.org/w/index.php?title=Well_Log_Techniques_At_Coso_Geothermal_Area_(1985)&oldid=600462

246

Slimhole Drilling, Logging, and Completion Technology - An Update  

SciTech Connect (OSTI)

Using slim holes (diameter < 15 cm) for geothermal exploration and small-scale power production can produce significant cost savings compared to conventional rotary-drilling methods. In addition, data obtained from slim holes can be used to lower the risks and costs associated with the drilling and completion of large-diameter geothermal wells. As a prime contractor to the U.S. Department of Energy (DOE), Sandia National Laboratories has worked with industry since 1992 to develop and promote drilling, testing, and logging technology for slim holes. This paper describes the current status of work done both in-house and contracted to industry. It focuses on drilling technology, case histories of slimhole drilling projects, data collection and rig instrumentation, and high-temperature logging tools.

FINGER,JOHN T.; JACOBSON,RONALD D.

1999-10-07T23:59:59.000Z

247

Gamma-Ray Bursts  

E-Print Network [OSTI]

Gamma-ray bursts are the most luminous explosions in the Universe, and their origin and mechanism are the focus of intense research and debate. More than three decades after their discovery, and after pioneering breakthroughs from space and ground experiments, their study is entering a new phase with the recently launched Swift satellite. The interplay between these observations and theoretical models of the prompt gamma ray burst and its afterglow is reviewed.

P. Meszaros

2006-05-30T23:59:59.000Z

248

Exponential coefficient plots for identifying cement channels from temperature logs  

SciTech Connect (OSTI)

One technique for identifying a cement channel in such a well is to inject cold water or diesel fuel for a period of time, followed by recording shut-in temperature profiles after the injection ceases. Qualitative judgements are made from the appearance of these profiles in order to confirm the existence of a channel. Alternatively, by processing the temperature logs mathematically, an exponential coefficient may be calculated and plotted against depth. This exponential coefficient plot is very responsive to the presence of cold fluid in a cement channel, and confirms a channel's existence quantitatively and conclusively. This paper discusses use of such a mathematical relationship in a predictive fashion for identifying injection zones. Methods are given for deriving and plotting the exponential coefficients from temperature logs of a well placed on cold fluid injection. Three examples are presented on the application of exponential coefficient plots to actual field logs for confirmation of suspected channels and for assessment of the uniformity of cement bonding.

Barnette, J.C.; Lanuke, E.W.; Carlson, N.R.

1984-01-01T23:59:59.000Z

249

Stratigraphic correlation of well logs using relational tree  

SciTech Connect (OSTI)

A heuristic waveform correlation scheme of well logs is based on a relational tree matching. Waveforms (well logs) are represented in a data structure known as a relational tree. A relational tree provides a complete description of the contextural relationships, as defined by peaks and valleys of the waveforms. The correlational scheme consists of a distance-measuring process using all possible peak attributes. First, a distance function is defined for any two nodes in terms of peak attributes. To find the best match for a given node of a given waveform, the authors measure the distance between the given node and each node from a predefined subset of the second waveform. The closest one is considered to be the matched node. The process is repeated for every node in the waveform. This quantitative correlation method has been implemented and tested with well logs from the Black Warrior basin, north Alabama. Results showed that the procedure has the capability of handling the thickening and thinning strata, as well as missing intervals.

Fang, J.H.; Tsay, F.; Lai, P.F.

1986-05-01T23:59:59.000Z

250

The Polarization Dependence of Gamma-Gamma Absorption - Implications for Gamma-Ray Bursts and Blazars  

E-Print Network [OSTI]

This paper presents an analysis of the dependence of the opacity for high-energy gamma-rays to gamma-gamma absorption by low-energy photons, on the polarization of the gamma-ray and target photons. This process has so far only been considered using the polarization-averaged gamma-gamma absorption cross section. It is demonstrated that in the case of polarized gamma-ray emission, subject to source-intrinsic gamma-gamma absorption by polarized target photons, this may lead to a slight over-estimation of the gamma-gamma opacity by up to ~ 10 % in the case of a perfectly ordered magnetic field. Thus, for realistic astrophysical scenarios with partially ordered magnetic fields, the use of the polarization-averaged gamma-gamma cross section is justified for practical purposes, such as estimates of minimum Doppler factors inferred for gamma-ray bursts and blazars, based on gamma-gamma transparency arguments, and this paper quantifies the small error incurred by the unpolarized-radiation approximation. Furthermore, i...

Boettcher, Markus

2014-01-01T23:59:59.000Z

251

V-068: Citrix CloudPlatform Logs Potentially Sensitive Information in the  

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

8: Citrix CloudPlatform Logs Potentially Sensitive Information 8: Citrix CloudPlatform Logs Potentially Sensitive Information in the Log File V-068: Citrix CloudPlatform Logs Potentially Sensitive Information in the Log File January 14, 2013 - 12:15am Addthis PROBLEM: Citrix CloudPlatform Logs Potentially Sensitive Information in the Log File PLATFORM: Citrix CloudStack and CloudPlatform up to and including 3.0.5. ABSTRACT: A vulnerability was reported in Citrix CloudPlatform. REFERENCE LINKS: Document ID: CTX136163 SecurityTracker Alert ID: 1027978 CVE-2012-5616 IMPACT ASSESSMENT: Medium DISCUSSION: A vulnerability has been identified in Citrix CloudPlatform, formerly known as Citrix CloudStack, that could result in security-sensitive information being logged during the normal operation of the CloudPlatform server. IMPACT:

252

Well Log Techniques At Raft River Geothermal Area (1977) | Open Energy  

Open Energy Info (EERE)

Well Log Techniques At Raft River Geothermal Area Well Log Techniques At Raft River Geothermal Area (1977) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Well Log Techniques Activity Date 1977 Usefulness not indicated DOE-funding Unknown Exploration Basis Characterize the rock using well log data. Notes Information is given on the following logs: dual-induction focused log, including resistivity, sp, and conductivity; acoustic log; compensated neutron; compensated densilog; and caliper. Lithologic breaks for a drill core to a depth of 2840 ft are illustrated. References Covington, H.R. (1 January 1978) Deep drilling data, Raft River geothermal area, Idaho Raft River geothermal exploration well No. 4 Retrieved from "http://en.openei.org/w/index.php?title=Well_Log_Techniques_At_Raft_River_Geothermal_Area_(1977)&oldid=6004

253

Boise State University Automobile Use Mileage Log (Documentation for Business Miles)  

E-Print Network [OSTI]

Boise State University Automobile Use Mileage Log (Documentation for Business Miles) Rev. 03 University Automobile Use Mileage Log (Documentation for Business Miles) Rev. 03/10 PAGE ____ (IF YOU NEED

Barrash, Warren

254

MATHEMATICS AND SCIENCE CENTERS STUDENT SERVICES ACTIVITY LOG/EVENT RECORD  

E-Print Network [OSTI]

MATHEMATICS AND SCIENCE CENTERS STUDENT SERVICES ACTIVITY LOG/EVENT RECORD Use this log for all. ENROLLEES BY TYPE: (Check one) ______ GENDER: ETHNICITY: ___ Mathematics ____ Female ___ African ___ No ___ Mathematics ___ Science ___ Technology ___ Other Describe: ____________________ 12. DESCRIPTION: (Purpose

255

Vote Selling, Voter Anonymity, and Forensic Logging of Electronic Voting Machines  

E-Print Network [OSTI]

iVotronic 8.0.1.2 Voting Machine Firmware: Final Report ForLogging of Electronic Voting Machines Sean Peisert and Mattment of electronic voting machinesforensic log- ging and

Peisert, Sean; Bishop, Matt; Yasinsac, Alec

2009-01-01T23:59:59.000Z

256

A Model for Water Factor Measurements With Fission-Neutron Logging...  

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

A Model for Water Factor Measurements With Fission-Neutron Logging Tools (May 1983) A Model for Water Factor Measurements With Fission-Neutron Logging Tools (May 1983) A Model for...

257

Nuclear Magnetic Resonance (NMR) is the only logging technique available to estimate pore-size  

E-Print Network [OSTI]

1 ABSTRACT Nuclear Magnetic Resonance (NMR) is the only logging technique available to estimate, Nuclear Magnetic Resonance (NMR) logging has been used to assess a handful of key petrophysical parameters

Torres-Verdín, Carlos

258

Nano {gamma}'/{gamma}'' composite precipitates in Alloy 718  

SciTech Connect (OSTI)

Nanoscale composite precipitates of Alloy 718 have been investigated with both high-resolution scanning transmission electron microscopy and phase field modeling. Chemical analysis via energy-dispersive x-ray spectroscopy allowed for the differentiation of {gamma}' and {gamma}'' particles, which is not otherwise possible through traditional Z-contrast methods. Phase field modeling was applied to determine the stress distribution and elastic interaction around and between the particles, respectively, and it was determined that a composite particle (of both {gamma}' and {gamma}'') has an elastic energy that is significantly lower than, for example, single {gamma}' and {gamma}'' precipitates which are non-interacting.

Phillips, P. J. [Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607 (United States); McAllister, D.; Gao, Y.; Lv, D.; Williams, R. E. A.; Wang, Y.; Mills, M. J. [Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210 (United States); Peterson, B. [Honeywell Aerospace, Phoenix, Arizona 85034 (United States)

2012-05-21T23:59:59.000Z

259

The stratigraphy of selected Mission Canyon wireline log markers, US portion of the Williston basin, North Dakota  

SciTech Connect (OSTI)

The Mission Canyon Formation along the northeast flank of the US Williston basin has been informally subdivided into intervals (members) based on wireline log markers. Wireline log responses of the markers are produced by both lithologic changes and radioactive elements present within these thin stratigraphic intervals. The wireline markers were originally described as transgressive events. Detailed stratigraphic analyses of the Sherwood and State A markers indicate they were deposited during progradation and sea level stillstand. A typical facies tract from east to west within the Sherwood marker contains anhydrites and anhydritic dolomites deposited in sabkha environments; patterned dolomudstones along shoreline trends (the Sherwood argillaceous marker); and limestones in shoaling environments along the Mission Canyon shelf (Sherwood gamma marker). During stillstand, brines produced in sabkha environments (east of the Sherwood shoreline) were enriched in magnesium and potassium. These brines migrated basinward first, dolomitizing mudstones. These brines were magnesium depleted by the time they reached shoals along the shelf. Potassium, however, remained in the system and is present within the marker along the shelf, as shown by a slight increase in API units on Spectrologs.

Hendricks, M.L. (Hendricks and Associates, Inc., Denver, CO (United States))

1991-06-01T23:59:59.000Z

260

Method and apparatus for logging short radius horizontal drainholes  

SciTech Connect (OSTI)

This patent describes an apparatus for use in logging a short radius horizontal drainhole. It comprises: a tubing string having a low portion; the lower portion of the tubing string including sensor support means therein; the lower portion of the tubing string containing openings communicating with the interior thereof in the vicinity of the sensor support means to thereby exposed the interior to the pressure and temperature conditions of the horizontal drainhole; and the lower portion of the tubing string including an end portion extending transversely of the tubing sting.

Taylor, D.E.

1991-04-30T23:59:59.000Z

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


261

Tsallis Distribution Decorated With Log-Periodic Oscillation  

E-Print Network [OSTI]

In many situations, in all branches of physics, one encounters power-like behavior of some variables which are best described by a Tsallis distribution characterized by a nonextensivity parameter $q$ and scale parameter $T$. However, there exist experimental results which can be described only by a Tsallis distributions which are additionally decorated by some log-periodic oscillating factor. We argue that such a factor can originate from allowing for a complex nonextensivity parameter $q$. The possible information conveyed by such an approach (like the occurrence of complex heat capacity, the notion of complex probability or complex multiplicative noise) will also be discussed.

Wilk, Grzegorz

2015-01-01T23:59:59.000Z

262

Tsallis Distribution Decorated With Log-Periodic Oscillation  

E-Print Network [OSTI]

In many situations, in all branches of physics, one encounters power-like behavior of some variables which are best described by a Tsallis distribution characterized by a nonextensivity parameter $q$ and scale parameter $T$. However, there exist experimental results which can be described only by a Tsallis distributions which are additionally decorated by some log-periodic oscillating factor. We argue that such a factor can originate from allowing for a complex nonextensivity parameter $q$. The possible information conveyed by such an approach (like the occurrence of complex heat capacity, the notion of complex probability or complex multiplicative noise) will also be discussed.

Grzegorz Wilk; Zbigniew Wlodarczyk

2015-01-12T23:59:59.000Z

263

Coal log pipeline research at the University of Missouri. Second quarterly report, April 1, 1994--June 30, 1994  

SciTech Connect (OSTI)

Coal log pipeline research continued. Progress is discussed in the following areas: fabrication, compaction, pipe abrasion, and machine design for the manufacture of the logs.

Liu, H.

1994-12-31T23:59:59.000Z

264

Short gamma-ray bursts from binary neutron star mergers in globular clusters  

E-Print Network [OSTI]

ARTICLES Short gamma-ray bursts from binary neutron star mergers in globular clusters JONATHAN@cfa.harvard.edu Published online: 29 January 2006; doi:10.1038/nphys214 Observations by the Swift gamma-ray-burst (GRB, the so-called `long' GRBs (>2-200 s) were located by coded aperture imaging of their hard X-ray emission

Loss, Daniel

265

Short vs. Long Gamma-Ray Bursts: A Comprehensive Study of Energetics and Prompt Gamma-Ray Correlations  

E-Print Network [OSTI]

We present the results of a comprehensive study of the luminosity function, energetics, prompt gamma-ray correlations, and classification methodology of short-hard and long-soft GRBs (SGRBs & LGRBs), based on observational data in the largest catalog of GRBs available to this date: BATSE catalog of 2130 GRBs. We find that: 1. The least-biased classification method of GRBs into short and long, solely based on prompt--emission properties appears to be the ratio of the observed spectral peak energy to the observed duration (R=Epk/T90) with the dividing line at R=50[erg/s]. 2. Once data is carefully corrected for the effects of the detection threshold of gamma-ray instruments, the population distribution of SGRBs and LGRBs can be individually well described as multivariate log-normal distribution in the 4-dimensional space of the isotropic peak gamma-ray luminosity, total isotropic gamma-ray emission, the intrinsic spectral peak energy, and the intrinsic duration. 3. Relatively large fractions of SGRBs and LG...

Shahmoradi, Amir

2014-01-01T23:59:59.000Z

266

Inactivation of Lassa, Marburg, and Ebola viruses by gamma irradiation  

SciTech Connect (OSTI)

Because of the cumbersome conditions experienced in a maximum containment laboratory, methods for inactivating highly pathogenic viruses were investigated. The infectivity of Lassa, Marburg, and Ebola viruses was inactivated without altering the immunological activity after radiation with /sup 60/CO gamma rays. At 4 degrees C, Lassa virus was the most difficult to inactivate with a rate of 5.3 X 10(-6) log 50% tissue culture infective dose per rad of /sup 60/CO radiation, as compared with 6.8 X 10(-6) log 50% tissue culture infective dose per rad for Ebola virus and 8.4 X 10(-6) log 50% tissue culture infective dose per rad for Marburg virus. Experimental inactivation curves, as well as curves giving the total radiation needed to inactivate a given concentration of any of the three viruses, are presented. The authors found this method of inactivation to be superior to UV light or beta-propiolactone inactivation and now routinely use it for preparation of material for protein-chemistry studies or for preparation of immunological reagents.

Elliott, L.H.; McCormick, J.B.; Johnson, K.M.

1982-10-01T23:59:59.000Z

267

Inactivation of Lassa, Marburg, and Ebola viruses by gamma irradiation  

SciTech Connect (OSTI)

Because of the cumbersome conditions experienced in a maximum containment laboratory, methods for inactivating highly pathogenic viruses were investigated. The infectivity of Lassa, Marburg, and Ebola viruses was inactivated without altering the immunological activity after radiation with /sup 60/Co gamma rays. At 4 degrees C, Lassa virus was the most difficult to inactivate with a rate of 5.3 X 10(-6) log 50% tissue culture infective dose per rad of /sup 60/Co radiation, as compared with 6.8 X 10(-6) log 50% tissue culture infective dose per rad for Ebola virus and 8.4 X 10(-6) log 50% tissue culture infective dose per rad for Marburg virus. Experimental inactivation curves, as well as curves giving the total radiation needed to inactivate a given concentration of any of the three viruses, are presented. We found this method of inactivation to be superior to UV light or beta-propiolactone inactivation and now routinely use it for preparation of material for protein-chemistry studies or for preparation of immunological reagents.

Elliott, L.H.; McCormick, J.B.; Johnson, K.M.

1982-10-01T23:59:59.000Z

268

Appendix A Lithologic and Monitor Well Completion Logs  

Office of Legacy Management (LM)

A A Lithologic and Monitor Well Completion Logs This page intentionally left blank WELL INSTALLATION BLANK CASING: 1.25 in. Stainless Steel 0.0 to 0.35 METHOD WELL SCREEN: 1.25 in. Stainless Steel 0.35 to 3.27 DATE DEVELOPED SUMPIEND CAP: 1.25 in. Stainless Steel 3.27 to 3.58 WATER LEVEL (FT BGS) SURFACE SEAL: LOGGED BY P. McKenzie REMARKS Drillers hit water at 5 fl: well point removed. LITHOLOGIC DESCRIPTION LOCATION SHIPROCK, NM SURFACE ELEV. ( FT NGVD) 4890.00 SITE SHIPROCK TOP OF CASING (FT) 4890.00 WELL NUMBER 0602 MEAS. PT. ELEV. (FT) 4890.00 SLOT SIZE (IN) 0.125 WELL INSTALLATION INTERVAL (FT) DRILLING METHOD BLANK CASING: 1.25 in. Stainless Steel 0.0 to 0.35 METHOD WELL SCREEN: 1.25 in. Stainless Steel 0.35 to 3.27 DATE DEVELOPED SUMPIEND CAP: 1.25 in. Stainless Steel 3.27 to 3.58

269

GLAST and Ground-Based Gamma-Ray Astronomy  

SciTech Connect (OSTI)

The launch of the Gamma-ray Large Area Space Telescope (GLAST) in 2007 will open the possibility of combined studies of astrophysical sources with existing ground-based VHE {gamma}-ray experiments such as H.E.S.S., VERITAS and MAGIC. Ground-based {gamma}-ray observatories provide complementary capabilities for spectral, temporal, spatial and population studies of high-energy {gamma}-ray sources. Joint observations cover a huge energy range, from 20 MeV to over 50 TeV. The LAT will survey the entire sky every three hours, allowing us to perform long-term monitoring of variable sources under uniform observation conditions and to detect flaring sources promptly. Imaging atmospheric Cherenkov telescopes (IACTs) will complement these observations with high-sensitivity pointed observations on regions of interest.

Funk, S.; Carson, J.E.; Giebels, B.; Longo, F.; McEnery, J.E.; Paneque, D.; Reimer, O.; Reyes, L.C.

2007-10-10T23:59:59.000Z

270

Gamma-ray Astronomy: Implications for Fundamental Physics  

E-Print Network [OSTI]

Gamma-ray Astronomy studies cosmic accelerators through their electromagnetic radiation in the energy range between ~100 MeV and ~100 TeV. The present most sensitive observations in this energy band are performed, from space, by the Large Area Telescope onboard the Fermi satellite and, from Earth, by the Imaging Air Cherenkov Telescopes MAGIC, H.E.S.S. and VERITAS. These instruments have revolutionized the field of Gamma-ray Astronomy, discovering different populations of gamma-ray emitters and studying in detail the non-thermal astrophysical processes producing this high-energy radiation. The scientific objectives of these observatories include also questions of fundamental physics. With gamma-ray instruments we study the origin of Galactic cosmic rays, testing the hypothesis or whether they are mainly produced in supernova explosions. Also, we obtain the most sensitive measurement of the cosmic electron-positron spectrum between 20 GeV and 5 TeV. By observing the gamma-ray emission from sources at cosmological distances, we learn about the intensity and evolution of the extragalactic background light, and perform tests of Lorentz Invariance. Moreover, we can search for dark matter by looking for gamma-ray signals produced by its annihilation or decay in over-density sites. In this paper, we review the most recent results produced with the current generation of gamma-ray instruments in these fields of research.

Javier Rico

2011-11-28T23:59:59.000Z

271

Gamma Ray Bursts  

E-Print Network [OSTI]

Gamma-ray bursts have been detected at photon energies up to tens of GeV. We review some recent developments in the X-ray to GeV photon phenomenology in the light of Swift and Fermi observations, and some of the theoretical models developed to explain them, with a view towards implications for C.T.A.

Peter Mszros

2012-04-12T23:59:59.000Z

272

Gamma-ray burst models  

Science Journals Connector (OSTI)

...research-article Discussion Meeting Issue Gamma-ray bursts organized by Alan Wells, Ralph...J. Wijers and Martin Rees Gamma-ray burst models Andrew King * * ( ark...various possibilities for making gamma-ray bursts, particularly from close binaries...

2007-01-01T23:59:59.000Z

273

Tests show production logging problems in horizontal gas wells  

SciTech Connect (OSTI)

A study has concluded that production logging tools employed to evaluate multiphase horizontal well production behavior should be carefully screened as to their response characteristics in fully-segregated, two-phase flow. The study, performed at Marathon Oil Co.'s petroleum technology center in Littleton, Colo., indicated that gas in highly deviated well bores segregates rapidly in the presence of water, creating a downhole environment that produces sporadic responses from full bore and diverter spinners as well as density and holdup tools. Gas Research Institute (GRI), as part of its horizontal gas well completion technology program, initiated the full-scale laboratory study to determine the severity and consequences of multiphase flow on tool response from horizontal well production. The paper discusses background of the problem, the test objectives, test facility, experimental procedures, single-phase flow, two-phase flow, and recommendations.

Branagan, P. (Branagan and Associates, Las Vegas, NV (United States)); Knight, B.L. (Marathon Oil Co., Littleton, CO (United States)); Aslakson, J. (Gas Research Inst., Chicago, IL (United States)); Middlebrook, M.L. (CER Corp., Las Vegas, NV (United States))

1994-01-10T23:59:59.000Z

274

Gamma Irradiation | ORNL Neutron Sciences  

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

Gamma Irradiation Gamma Irradiation Gamma Irradiation Facility Gamma irradiation chamber Gamma irradiation chamber. The HFIR Gamma Irradiation Facility is an experimental facility designed to irradiate materials with gamma radiation from spent fuel elements. The facility chamber is stainless steel and is made of 0.065-thick tubing to maximize the internal dimensions of the chamber. This allows for the largest samples possible that can still fit inside the cadmium post of the spent fuel loading station positions. The interior chamber is approximately 3.75 inches inside diameter and accommodates samples up to 25 inches long. There are two configurations for the chamber assembly, with the only difference being the plugs. The uninstrumented configuration has a top plug that is used for installation of the samples, to support the inert gas

275

Image Reconstruction for Prostate Specific Nuclear Medicine imagers  

SciTech Connect (OSTI)

There is increasing interest in the design and construction of nuclear medicine detectors for dedicated prostate imaging. These include detectors designed for imaging the biodistribution of radiopharmaceuticals labeled with single gamma as well as positron-emitting radionuclides. New detectors and acquisition geometries present challenges and opportunities for image reconstruction. In this contribution various strategies for image reconstruction for these special purpose imagers are reviewed. Iterative statistical algorithms provide a framework for reconstructing prostate images from a wide variety of detectors and acquisition geometries for PET and SPECT. The key to their success is modeling the physics of photon transport and data acquisition and the Poisson statistics of nuclear decay. Analytic image reconstruction methods can be fast and are useful for favorable acquisition geometries. Future perspectives on algorithm development and data analysis for prostate imaging are presented.

Mark Smith

2007-01-11T23:59:59.000Z

276

Coal log pipeline research at the University of Missouri. 2nd quarterly report, April 4, 1995--June 30, 1995  

SciTech Connect (OSTI)

This report describes the accomplishments in coal log pipeline research and manufacturing. Flow results are included.

Liu, H.

1995-12-01T23:59:59.000Z

277

E-Print Network 3.0 - annihilation gamma rays Sample Search Results  

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

32 3 grid 74 94 3.05 ora SPEC ray tracing 650 array elements... .0 0.5 1.0 1.5 2.0 GammaGammaGammaGammaGammaGamma GammaGammaGammaGammaGammaGamma GammaGammaGamma...

278

E-Print Network 3.0 - atmospheric gamma rays Sample Search Results  

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

32 3 grid 74 94 3.05 ora SPEC ray tracing 650 array elements... .0 0.5 1.0 1.5 2.0 GammaGammaGammaGammaGammaGamma GammaGammaGammaGammaGammaGamma GammaGammaGamma...

279

GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky |  

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

GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky GLAST Observatory Renamed for Fermi, Reveals Entire Gamma-Ray Sky August 26, 2008 - 3:20pm Addthis WASHINGTON, D.C. - The U.S. Department of Energy (DOE) and NASA announced today that the Gamma-Ray Large Area Space Telescope (GLAST) has revealed its first all-sky map in gamma rays. The onboard Large Area Telescope's (LAT) all-sky image-which shows the glowing gas of the Milky Way, blinking pulsars and a flaring galaxy billions of light-years away-was created using only 95 hours of "first light" observations, compared with past missions which took years to produce a similar image. Scientists expect the telescope will discover many new pulsars in our own galaxy, reveal powerful

280

Forward Modeling of the Induction Log Response of a Fractured Geologic Formation  

E-Print Network [OSTI]

3.1 Layered Earth Model The environment used for the induction log simulations is a layered Earth model. The model consists of six layers that are assigned different thicknesses and conductivities based on the desired induction log... Tx-Rx pair has a fixed separation and is moved along a vertical profile through the subsurface taking measurements at predetermined logging points. 20 The second change to the original Seatem code involves the surrounding environment. The code...

Bray, Steven Hunter

2013-05-02T23:59:59.000Z

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


281

The Animated Gamma-ray Sky Revealed by the Fermi Gamma-ray Space Telescope  

ScienceCinema (OSTI)

The Fermi Gamma-ray Space Telescope has been observing the sky in gamma-rays since August 2008. In addition to breakthrough capabilities in energy coverage (20 MeV-300 GeV) and angular resolution, the wide field of view of the Large Area Telescope enables observations of 20% of the sky at any instant, and of the whole sky every three hours. It has revealed a very animated sky with bright gamma-ray bursts flashing and vanishing in minutes, powerful active galactic nuclei flaring over hours and days, many pulsars twinkling in the Milky Way, and X-ray binaries shimmering along their orbit. Most of these variable sources had not been seen by the Fermi predecessor, EGRET, and the wealth of new data already brings important clues to the origin of the high-energy emission and particles powered by the compact objects. The telescope also brings crisp images of the bright gamma-ray emission produced by cosmic-ray interactions in the interstellar medium, thus allowing to measure the cosmic nuclei and electron spectra across the Galaxy, to weigh interstellar clouds, in particular in the dark-gas phase. The telescope sensitivity at high energy will soon provide useful constraints on dark-matter annihilations in a variety of environments. I will review the current results and future prospects of the Fermi mission.

Isabelle Grenier

2010-01-08T23:59:59.000Z

282

Pressure Temperature Log At Silver Peak Area (DOE GTP) | Open Energy  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Pressure Temperature Log At Silver Peak Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Silver Peak Area (DOE GTP) Exploration Activity Details Location Silver Peak Area Exploration Technique Pressure Temperature Log Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Pressure_Temperature_Log_At_Silver_Peak_Area_(DOE_GTP)&oldid=511053" Categories: Exploration Activities

283

Synthesis of Multipole Acoustic Logging Measurements Using the Generalized Reflection/Transmission Matrices Method  

E-Print Network [OSTI]

Synthesis of Multipole Acoustic Logging Measurements Using the Generalized Reflection analytical method that has been used in multipole waveform synthesis for radially multilayered formations

Torres-Verdín, Carlos

284

Density Log at Fish Lake Valley Area (DOE GTP) | Open Energy...  

Open Energy Info (EERE)

Fish Lake Valley Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Density Log at Fish Lake Valley Area (DOE GTP) Exploration...

285

E-Print Network 3.0 - advanced logging workshop Sample Search...  

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

ability to corrupt the log 12;les. We describe a ... Source: Schneier, Bruce - BT Group plc Collection: Computer Technologies and Information Sciences 22 Summary Workshop Report...

286

Neutron Log At Silver Peak Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

Neutron Log Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Additional References Retrieved from "http:en.openei.org...

287

Density Log at Fort Bliss Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

Fort Bliss Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Density Log at Fort Bliss Area (DOE GTP) Exploration Activity Details...

288

The Galactic gamma-ray club  

E-Print Network [OSTI]

The exclusive Galactic gamma-ray club has opened up to new members. Supernova remnants, pulsar wind nebulae, and massive binary systems hosting a compact object have recently joined the young pulsars as firmly established sources of gamma rays in the Milky Way. Massive young stellar clusters are on the waiting list to join the club. Only the fine imaging recently obtained at TeV energies could resolve specific sources. The samples are sparse, but raise exciting questions. The jet or pulsar-wind origin of the emission in binaries has been hotly debated, but it seems that both types of systems have been recently detected. The nature of the radiation in shock accelerators is still questioned: do nuclei contribute a lot, a little, or not to the gamma rays and what energy do they carry away from the shock budget? The acceleration process and the structural evolution of the pulsar winds are still uncertain. The magnetic field distribution in all these systems is a key, but poorly constrained, ingredient to model the multi-wavelength data, particle transport and electron ageing. It must, however, be determined in order to efficiently probe particle distributions and the acceleration mechanisms. The source samples soon to be expected from GLAST and the Cherenkov telescopes should bring new valuable test cases and they will, for the first time, shed statistical light on the collective behaviour of these different types of accelerators.

Isabelle A. Grenier

2008-04-02T23:59:59.000Z

289

Remnants from Gamma-Ray Bursts  

Science Journals Connector (OSTI)

We model the intermediate-time evolution of a "jetted" gamma-ray burst (GRB) as two blobs of matter colliding with the interstellar medium. We follow the hydrodynamic evolution of this system numerically and calculate the bremsstrahlung and synchrotron images of the remnant. We find that for a burst energy of 1051 ergs the remnant becomes spherical after ~5000 yr, when it has collected ~50 M? of interstellar mass. This result is independent of the exact details of the GRB, such as the opening angle. After this time a gamma-ray burst remnant has an expanding sphere morphology. The similarity to a supernova remnant makes it difficult to distinguish between the two at this stage. The expected number of nonspherical gamma-ray burst remnants is ~0.05 per galaxy for a beaming factor of 0.01 and a burst energy of 1051 ergs. Our results suggest that the double-shell object DEM L316 is not a GRB remnant.

Shai Ayal; Tsvi Piran

2001-01-01T23:59:59.000Z

290

Application of the gamma evaluation method in Gamma Knife film dosimetry  

SciTech Connect (OSTI)

Purpose: Gamma Knife (GK) radiosurgery is a minimally invasive surgical technique for the treatment of intracranial lesions. To minimize neurological deficits, submillimeter accuracy is required during treatment delivery. In this paper, the delivery accuracy of GK radiosurgery was assessed with the gamma evaluation method using planning dose distribution and film measurement data. Methods: Single 4, 8, and 16 mm and composite shot plans were developed for evaluation using the GK Perfexion (PFX) treatment planning system (TPS). The planning dose distributions were exported as digital image communications in medicine - radiation therapy (DICOM RT) files using a new function of GK TPS. A maximum dose of 8 Gy was prescribed for four test plans. Irradiation was performed onto a spherical solid water phantom using Gafchromic EBT2 films in the axial and coronal planes. The exposed films were converted to absolute dose based on a 4th-order polynomial calibration curve determined using ten calibration films. The film measurement results and planning dose distributions were registered for further analysis in the same Leksell coordinate using in-house software. The gamma evaluation method was applied to two dose distributions with varying spatial tolerance (0.3-2.0 mm) and dosimetric tolerance (0.3-2.0%), to verify the accuracy of GK radiosurgery. The result of gamma evaluation was assessed using pass rate, dose gamma index histogram (DGH), and dose pass rate histogram (DPH). Results: The 20, 50, and 80% isodose lines found in film measurements were in close agreement with the planning isodose lines, for all dose levels. The comparison of diagonal line profiles across the axial plane yielded similar results. The gamma evaluation method resulted in high pass rates of >95% within the 50% isodose line for 0.5 mm/0.5% tolerance criteria, in both the axial and coronal planes. They satisfied 1.0 mm/1.0% criteria within the 20% isodose line. Our DGH and DPH also showed that low isodose lines exhibited inferior gamma indexes and pass rates compared with higher isodose lines. Conclusions: The gamma evaluation method was applicable to GK radiosurgery. For all test plans, planning dose distribution and film measurement met the tolerance criteria of 0.5 mm/0.5% within the 50% isodose line which are used for marginal dose prescription.

Park, Jeong-Hoon; Han, Jung Ho; Kim, Chae-Yong; Oh, Chang Wan; Lee, Do-Heui; Suh, Tae-Suk; Gyu Kim, Dong; Chung, Hyun-Tai [Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam 463-707, Korea and Department of Biomedical Engineering, College of Medicine, Catholic University of Korea Seoul 137-701 (Korea, Republic of); Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam 463-707, Korea and Department of Neurosurgery, College of Medicine, Seoul National University, Seoul 110-799 (Korea, Republic of); Department of Neurosurgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul 138-736 (Korea, Republic of); Department of Biomedical Engineering and Research Institute of Biomedical Engineering, College of Medicine, Catholic University of Korea, Seoul 137-701 (Korea, Republic of); Department of Neurosurgery, College of Medicine, Seoul National University, Seoul 110-799 (Korea, Republic of)

2011-10-15T23:59:59.000Z

291

LASER-PLASMA-ACCELERATOR-BASED GAMMA GAMMA COLLIDERS  

E-Print Network [OSTI]

LASER-PLASMA-ACCELERATOR-BASED ?? COLLIDERS ? C. B.linear col- lider based on laser-plasma-accelerators arediscussed, and a laser-plasma-accelerator-based gamma-

Schroeder, C. B.

2010-01-01T23:59:59.000Z

292

The GAMMA-400 Space Mission  

E-Print Network [OSTI]

GAMMA-400 is a new space mission which will be installed on board the Russian space platform Navigator. It is scheduled to be launched at the beginning of the next decade. GAMMA-400 is designed to study simultaneously gamma rays (up to 3 TeV) and cosmic rays (electrons and positrons from 1 GeV to 20 TeV, nuclei up to 10$^{15}$-10$^{16}$ eV). Being a dual-purpose mission, GAMMA-400 will be able to address some of the most impelling science topics, such as search for signatures of dark matter, cosmic-rays origin and propagation, and the nature of transients. GAMMA-400 will try to solve the unanswered questions on these topics by high-precision measurements of the Galactic and extragalactic gamma-ray sources, Galactic and extragalactic diffuse emission and the spectra of cosmic-ray electrons + positrons and nuclei, thanks to excellent energy and angular resolutions.

Cumani, P; Bonvicini, V; Topchiev, N P; Adriani, O; Aptekar, R L; Arkhangelskaja, I V; Arkhangelskiy, A I; Bergstrom, L; Berti, E; Bigongiari, G; Bobkov, S G; Boezio, M; Bogomolov, E A; Bonechi, S; Bongi, M; Bottai, S; Castellini, G; Cattaneo, P W; Dedenko, G L; De Donato, C; Dogiel, V A; Gorbunov, M S; Gusakov, Yu V; Hnatyk, B I; Kadilin, V V; Kaplin, V A; Kaplun, A A; Kheymits, M D; Korepanov, V E; Larsson, J; Leonov, A A; Loginov, V A; Longo, F; Maestro, P; Marrocchesi, P S; Menshenin, A L; Mikhailov, V V; Mocchiutti, E; Moiseev, A A; Mori, N; Moskalenko, I V; Naumov, P Yu; Papini, P; Pearce, M; Picozza, P; Popov, A V; Rappoldi, A; Ricciarini, S; Runtso, M F; Ryde, F; Serdin, O V; Sparvoli, R; Spillantini, P; Suchkov, S I; Tavani, M; Taraskin, A A; Tiberio, A; Tyurin, E M; Ulanov, M V; Vacchi, A; Vannuccini, E; Vasilyev, G I; Yurkin, Yu T; Zampa, N; Zirakashvili, V N; Zverev, V G

2015-01-01T23:59:59.000Z

293

Gamma-ray burst populations.  

E-Print Network [OSTI]

??Over the last fifty years the field of gamma-ray bursts has shown incredible growth, but the amassing of data has also left observers and theorists (more)

Virgili, Francisco J.

2011-01-01T23:59:59.000Z

294

Social Network Discovery from Multiple Log Data through a Behavior Model  

Science Journals Connector (OSTI)

This paper proposes a new framework for inferring social networks of smart phone users from log data on web browsing and mobile application execution. In the framework, a behavior model is built by taking into account the effects of homophily, other ... Keywords: social network, log analysis, behavior model

Tomonobu Ozaki; Minoru Etoh

2012-03-01T23:59:59.000Z

295

Department of Industrial & Manufacturing Engineering Spring 2011 Log Splitter Tank Quality Improvement  

E-Print Network [OSTI]

PENNSTATE Department of Industrial & Manufacturing Engineering Spring 2011 Log Splitter Tank around a central hydraulic tank which acts as the base of the log splitter. The tanks can leak due to poor weld integrity, further aggravated by stresses on the tank during towing. Also, internal rust

Demirel, Melik C.

296

Synthesis of class-AB log-domain filters based on nonlinear transconductance  

Science Journals Connector (OSTI)

In this paper a new generalized method for synthesis of class-AB current-mode log-domain filters, using nonlinear transconductance cell, is presented. The proposed nonlinear transconductance cell is designed by employing floating-gate MOS (FG-MOS) transistors ... Keywords: Class-AB, Current splitter, Current-mode, Filter, Log-domain, Transconductance

E. Farshidi

2010-05-01T23:59:59.000Z

297

Integration of Geology, Rock-Physics, Logs, and Pre-stack Seismic for Reservoir Porosity Estimation  

E-Print Network [OSTI]

The main objective of this paper is to obtain reservoir properties, such as porosity, both at the well locations and in the inter-well regions from seismic data and well logs. The seismic and well-log datasets are from an ...

Al Muhaidib, Abdulaziz

2011-01-01T23:59:59.000Z

298

SIMULATION OF RESISTIVITY LOGGING-WHILE-DRILLING (LWD) MEASUREMENTS USING A SELF-ADAPTIVE  

E-Print Network [OSTI]

the electromagnetic response of geophysical resistivity logging instruments in a borehole environment in a borehole environment. The measurements are used to assess electrical properties of rock formations. Logging (see, for example, [7, 18] and references therein) to accurately solve a large class of engineering

Torres-Verdín, Carlos

299

The broad-band fractal nature of heterogeneity in the upper crust from petrophysical logs  

Science Journals Connector (OSTI)

......1991. Deep borehole log evidence for...heterogeneity and large-scale velocity...Continental Deep-Drilling (KTB) Holes...results, for the borehole data, show broad-band...spectral scaling in borehole logs, Geophys...23, 31193122. large-scale velocity......

Sean S. Dolan; Christopher J. Bean; Bruno Riollet

1998-03-01T23:59:59.000Z

300

Impact of assumption of log-normal distribution on monthly rainfall estimation from TMI  

E-Print Network [OSTI]

The log-normal assumption for the distribution of the rain rates used for the estimation of monthly rain totals proposed in Wilheit et al 1991 was examined. Since the log-normal assumption was originally used for the SSM/I, it is now necessary to re...

Lee, Dong Heon

2012-06-07T23:59:59.000Z

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


301

Weekly Security Incident Log Period of Nov 27 -Dec 2, 2012  

E-Print Network [OSTI]

was obtained. 11/28/2012 01:41 PM Suspicious Person 2012-002119 ROSS BUILDING - NORTH TOWER Private PropertyWeekly Security Incident Log Period of Nov 27 - Dec 2, 2012 Incident No. Reported Date Building:41 AM Theft, Under Weekly Security Incident Log Printed: 12/3/2012 3:18:11 PM 1 Period of Nov 27 - Dec 2

302

Vote Selling, Voter Anonymity, and Forensic Logging of Electronic Voting Machines  

E-Print Network [OSTI]

Vote Selling, Voter Anonymity, and Forensic Logging of Electronic Voting Machines Sean Peisert,bishop}@cs.ucdavis.edu Alec Yasinsac School of Computer and Information Sciences University of South Alabama yasinsac of electronic voting machines---forensic log­ ging and auditing---that, in concert with other el­ ements

Bishop, Matt

303

Vote Selling, Voter Anonymity, and Forensic Logging of Electronic Voting Machines  

E-Print Network [OSTI]

Vote Selling, Voter Anonymity, and Forensic Logging of Electronic Voting Machines Sean Peisert,bishop}@cs.ucdavis.edu Alec Yasinsac School of Computer and Information Sciences University of South Alabama yasinsac voting machines--forensic log- ging and auditing--that, in concert with other el- ements of the VVSG2007

Peisert, Sean

304

Cognition Based Collaboration Log for CSCW Datong Chen & Hans-Werner Gellersen  

E-Print Network [OSTI]

Cognition Based Collaboration Log for CSCW Datong Chen & Hans-Werner Gellersen Tec collaborative work. Analysis and recognition techniques are applied to the collected information and to obtain and stored in a special designed content-based multimedia database called collaboration log

Chen, Datong

305

Computing Reliability Distributions of Windowed Max-log-map (MLM) Detectors : ISI Channels  

E-Print Network [OSTI]

Computing Reliability Distributions of Windowed Max-log-map (MLM) Detectors : ISI Channels Fabian provide exact expressions for both i) the joint distribution of the MLM symbol reliabilities, and ii--detection, intersymbol inteference, max-log- map, probability distribution, reliability I. INTRODUCTION The max

Kavcic, Aleksandar

306

Pressure Temperature Log At Vale Hot Springs Area (Combs, Et Al., 1999) |  

Open Energy Info (EERE)

Vale Hot Springs Area (Combs, Et Al., 1999) Vale Hot Springs Area (Combs, Et Al., 1999) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Vale Hot Springs Area (Combs, Et Al., 1999) Exploration Activity Details Location Vale Hot Springs Area Exploration Technique Pressure Temperature Log Activity Date Usefulness not indicated DOE-funding Unknown Notes Numerous temperature logs were taken with Sandia's platinum-resistance-thermometer (PRT) tool which along with a Sandia logging truck remained on-site for the entire project. Static temperature logs (no flow in hole) were done with this tool when coring operations were suspended for bit trips, rig maintenance, or other time intervals that would permit the hole to warm up near its static temperature K580gradient.

307

Resistivity Log At Long Valley Caldera Area (Sorey, Et Al., 1991) | Open  

Open Energy Info (EERE)

Resistivity Log At Long Valley Caldera Area (Sorey, Resistivity Log At Long Valley Caldera Area (Sorey, Et Al., 1991) Exploration Activity Details Location Long Valley Caldera Area Exploration Technique Resistivity Log Activity Date Usefulness could be useful with more improvements DOE-funding Unknown Notes Lithologic and resistivity logs from wells drilled into areas of less than 20 ohm-m resistivity show clay mineralization resulting from hydrothermal alteration within the volcanic fill (Nordquist, 1987). Low resistivity in the vicinity of well 44-16, identified in wellbore geophysical logs and two dimensional MT modeling is restricted to the thermal-fluid reservoirs in the early rhyolite and Bishop Tuff (Nordquist, 1987; Suemnicht, 1987). The MT data suggest that the resistivity structure near Mammoth Mountain is

308

Geophysical logging case history of the Raft River geothermal system, Idaho  

Open Energy Info (EERE)

Geophysical logging case history of the Raft River geothermal system, Idaho Geophysical logging case history of the Raft River geothermal system, Idaho Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Geophysical logging case history of the Raft River geothermal system, Idaho Details Activities (1) Areas (1) Regions (0) Abstract: Drilling to evaluate the geothermal resource in the Raft River Valley began in 1974 and resulted in the discovery of a geothermal reservoir at a depth of approximately 1523 m (500 ft). Several organizations and companies have been involved in the geophysical logging program. There is no comprehensive report on the geophysical logging, nor has there been a complete interpretation. The objectives of this study are to make an integrated interpretation of the available data and compile a case history. Emphasis has been on developing a simple interpretation

309

Pressure Temperature Log At Mccoy Geothermal Area (DOE GTP) | Open Energy  

Open Energy Info (EERE)

Pressure Temperature Log At Mccoy Geothermal Area (DOE GTP) Pressure Temperature Log At Mccoy Geothermal Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Mccoy Geothermal Area (DOE GTP) Exploration Activity Details Location Mccoy Geothermal Area Exploration Technique Pressure Temperature Log Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Pressure_Temperature_Log_At_Mccoy_Geothermal_Area_(DOE_GTP)&oldid=511052" Categories: Exploration Activities DOE Funded Activities ARRA Funded Activities What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load)

310

U-039: ISC Update: BIND 9 Resolver crashes after logging an error in  

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

9: ISC Update: BIND 9 Resolver crashes after logging an error 9: ISC Update: BIND 9 Resolver crashes after logging an error in query.c U-039: ISC Update: BIND 9 Resolver crashes after logging an error in query.c November 16, 2011 - 2:30pm Addthis PROBLEM: ISC Update: BIND 9 Resolver crashes after logging an error in query.c. PLATFORM: Versions of BIND, 9.4-ESV, 9.6-ESV, 9.7.x, 9.8.x ABSTRACT: A remote server can cause the target connected client to crash. Organizations across the Internet are reporting crashes interrupting service on BIND 9 nameservers performing recursive queries. Affected servers crash after logging an error in query.c with the following message: "INSIST(! dns_rdataset_isassociated(sigrdataset))" Multiple versions are reported as being affected, including all currently supported release versions of ISC BIND 9. ISC is actively investigating the root cause and

311

Well log interpretation of certain geothermal fields in the Imperial Valley, California  

SciTech Connect (OSTI)

This study reviews the wireline log responses of some geothermal fields in the Imperial Valley, California. The fields under study include the Heber, the East Mesa, the Brawley, and the Westmoreland. The well logs used in the study did not include all the wireline surveys obtained by the operators. The selected well logs obtained under special arrangements with the operators were chosen to maintain the anonymity of specific well locations but are only representative of each area. Analysis of the well logs indicates that on an individual field basis, the well logs are excellent for correlation purposes. The presence of extremely saline fluids in some fields precludes the monitoring of Q/sub v/ (cation exchange capacity per unit volume) profile for detection of hydrothermally altered zones. The producing sections in all the fields are characterized by low porosity and high resistivity.

Ershaghi, I.; Abdassah, D.

1984-03-01T23:59:59.000Z

312

Cross-Dipole Acoustic Log At Alum Area (Moos & Ronne, 2010) | Open Energy  

Open Energy Info (EERE)

Dipole Acoustic Log At Alum Area (Moos & Ronne, 2010) Dipole Acoustic Log At Alum Area (Moos & Ronne, 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Cross-Dipole Acoustic Log At Alum Geothermal Area (Moos & Ronne, 2010) Exploration Activity Details Location Alum Geothermal Area Exploration Technique Cross-Dipole Acoustic Log Activity Date Usefulness useful DOE-funding Unknown Notes A crossed-dipole acoustic log detected stress induced anisotropy in the sediments, and also appeared to be able to identify and orient steeply dipping, compliant and therefore possibly conductive fractures in basement rocks. Because the shear-wave velocity was extremely low throughout most of the sedimentary section dipole data was required for its determination. The analysis results, which included a stress determination based on an

313

Well Log Techniques At Snake River Plain Region (DOE GTP) | Open Energy  

Open Energy Info (EERE)

Well Log Techniques At Snake River Plain Region (DOE GTP) Well Log Techniques At Snake River Plain Region (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Well Log Techniques At Snake River Plain Region (DOE GTP) Exploration Activity Details Location Snake River Plain Geothermal Region Exploration Technique Well Log Techniques Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Well_Log_Techniques_At_Snake_River_Plain_Region_(DOE_GTP)&oldid=600470" Categories: Exploration Activities DOE Funded Activities ARRA Funded Activities What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load)

314

U-038: BIND 9 Resolver crashes after logging an error in query.c |  

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

8: BIND 9 Resolver crashes after logging an error in query.c 8: BIND 9 Resolver crashes after logging an error in query.c U-038: BIND 9 Resolver crashes after logging an error in query.c November 16, 2011 - 8:37am Addthis PROBLEM: BIND 9 Resolver crashes after logging an error in query.c. PLATFORM: Multiple version of BIND 9. Specific versions under investigation ABSTRACT: A remote server can cause the target connected client to crash. Organizations across the Internet are reporting crashes interrupting service on BIND 9 nameservers performing recursive queries. Affected servers crash after logging an error in query.c with the following message: "INSIST(! dns_rdataset_isassociated(sigrdataset))" Multiple versions are reported as being affected, including all currently supported release versions of ISC BIND 9. ISC is actively investigating the root cause and

315

Gas hydrate identified in sand-rich inferred sedimentary section using downhole logging and seismic data in Shenhu area, South China Sea  

Science Journals Connector (OSTI)

Abstract Downhole wireline log (DWL) data was acquired from eight drill sites during China's first gas hydrate drilling expedition (GMGS-1) in 2007. Initial analyses of the acquired well log data suggested that there were no significant gas hydrate occurrences at Site SH4. However, the re-examination of the DWL data from Site SH4 indicated that there are two intervals of high resistivity, which could be indicative of gas hydrate. One interval of high resistivity at depth of 171175m below seafloor (mbsf) is associated with a high compressional- wave (P-wave) velocities and low gamma ray log values, which suggests the presence of gas hydrate in a potentially sand-rich (low clay content) sedimentary section. The second high resistivity interval at depth of 175180mbsf is associated with low P-wave velocities and low gamma values, which suggests the presence of free gas in a potentially sand-rich (low clay content) sedimentary section. Because the occurrence of free gas is much shallower than the expected from the regional depth of the bottom simulating reflector (BSR), the free gas could be from the dissociation of gas hydrate during drilling or there may be a local anomaly in the depth to the base of the gas hydrate stability zone. In order to determine whether the low P-wave velocity with high resistivity is caused by in-situ free gas or dissociated free gas from the gas hydrate, the surface seismic data were also used in this analysis. The log analysis incorporating the surface seismic data through the construction of synthetic seismograms using various models indicated the presence of free gas directly in contact with an overlying gas hydrate-bearing section. The occurrence of the anomalous base of gas hydrate stability at Site SH4 could be caused by a local heat flow conditions. This paper documents the first observation of gas hydrate in what is believed to be a sand-rich sediment in Shenhu area of the South China Sea.

Xiujuan Wang; Myung Lee; Timthy Collett; Shengxiong Yang; Yiqun Guo; Shiguo Wu

2014-01-01T23:59:59.000Z

316

COMPACT, TUNABLE COMPTON SCATTERING GAMMA-RAY SOURCES  

SciTech Connect (OSTI)

Recent progress in accelerator physics and laser technology have enabled the development of a new class of gamma-ray light sources based on Compton scattering between a high-brightness, relativistic electron beam and a high intensity laser pulse produced via chirped-pulse amplification (CPA). A precision, tunable gamma-ray source driven by a compact, high-gradient X-band linac is currently under development at LLNL. High-brightness, relativistic electron bunches produced by the linac interact with a Joule-class, 10 ps laser pulse to generate tunable {gamma}-rays in the 0.5-2.5 MeV photon energy range via Compton scattering. The source will be used to excite nuclear resonance fluorescence lines in various isotopes; applications include homeland security, stockpile science and surveillance, nuclear fuel assay, and waste imaging and assay. The source design, key parameters, and current status are presented.

Hartemann, F V; Albert, F; Anderson, G G; Anderson, S G; Bayramian, A J; Betts, S M; Chu, T S; Cross, R R; Ebbers, C A; Fisher, S E; Gibson, D J; Ladran, A S; Marsh, R A; Messerly, M J; O'Neill, K L; Semenov, V A; Shverdin, M Y; Siders, C W; McNabb, D P; Barty, C J; Vlieks, A E; Jongewaard, E N; Tantawi, S G; Raubenheimer, T O

2009-08-20T23:59:59.000Z

317

Clustering of gamma-ray selected 2LAC Fermi Blazars  

E-Print Network [OSTI]

We present the first measurement of the projected correlation function of 485 gamma-ray selected Blazars, divided in 175 BLLacertae (BL Lacs) and 310 Flat Spectrum Radio Quasars (FSRQs) detected in the 2-year all-sky survey by Fermi-Large Area Telescope. We find that Fermi BL Lacs and FSRQs reside in massive dark matter halos (DMHs) with logMh=13.35+0.20/-0.14 and logMh = 13.40+0.15/-0.19 Msun/h, respectively, at low (z=0.4) and high (z =1.2) redshift. In terms of clustering properties, these results suggest that BL Lacs and FSRQs are similar objects residing in the same dense environment typical of galaxy groups, despite their different spectral energy distribution, power and accretion rate. We find no difference in the typical bias and hosting halo mass between Fermi Blazars and radio-loud AGN, supporting the unifcation scheme simply equating radio-loud objects with misaligned Blazar counterparts. This similarity in terms of typical environment they preferentially live in, suggests that Blazars preferential...

Allevato, Viola; Cappelluti, Nico

2014-01-01T23:59:59.000Z

318

Coal log pipeline research at the University of Missouri. 1st Quarterly report for 1995, January 1, 1995--March 31, 1995  

SciTech Connect (OSTI)

Work continued on the study of coal log pipeline research. Individual projects described include fast compaction of coal logs; effect of cooling on coal log quality; coal log capping; effectiveness of adding fiber to enhance coal log quality; fabrication using hydrophobic binders; cost estimation of different lubricants; automatic control of coal log pipeline system; CLP design; coal log train transport; economics of coal log pipeline; legal aspects; heating, cooling, and drying of logs; vacuum systems to enhance production; design; and effect of piston modification on capping.

Liu, H.

1995-08-01T23:59:59.000Z

319

New gamma-ray observatory begins operations at Sierra Negra volcano in the  

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

New gamma-ray observatory begins operations New gamma-ray observatory begins operations New gamma-ray observatory begins operations at Sierra Negra volcano in the state of Puebla, Mexico The High-Altitude Water Cherenkov Gamma Ray Observatory has begun formal operations at its site in Mexico. August 21, 2013 The HAWC Observatory taken in August 2013 from the summit of Sierra Negra. The image has been digitally altered to show HAWC as it will appear when construction is complete in 2014. The 111 Cherenkov detectors currently installed (100 Cherenkov detectors in operation) are colored white and located in the upper right quadrant of the array. The HAWC Observatory taken in August 2013 from the summit of Sierra Negra. The image has been digitally altered to show HAWC as it will appear when construction is complete in 2014. The 111 Cherenkov detectors currently

320

HAWC Observatory captures first image  

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

April » April » HAWC Observatory captures first image HAWC Observatory captures first image The facility is designed to detect cosmic rays and the highest energy gamma rays ever observed from astrophysical sources. April 30, 2013 The High-Altitude Water Cherenkov (HAWC) Observatory is under construction. The High-Altitude Water Cherenkov (HAWC) Observatory is under construction. HAWC is under construction inside the Parque Nacional Pico de Orizaba, a Mexican national park. An international team of researchers, including scientists from Los Alamos, has taken the first image of the High-Altitude Water Cherenkov Observatory, or HAWC. The facility is designed to detect cosmic rays and the highest energy gamma rays ever observed from astrophysical sources. HAWC is under

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


321

Nonprofit Organizations: Have Your Los Alamos Employees/Retirees Log Hours  

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

Nonprofit Organizations: Have Your Los Alamos Employees/Retirees Log Nonprofit Organizations: Have Your Los Alamos Employees/Retirees Log Hours in VolunteerMatch Community Connections: Our link to Northern New Mexico Communities Latest Issue:Dec. 2013 - Jan. 2014 All Issues » submit Nonprofit Organizations: Have Your Los Alamos Employees/Retirees Log Hours in VolunteerMatch Lab employees and retirees should log their VolunteerMatch hours to benefit local nonprofits. March 1, 2013 Volunteers help fill sandbags during flood season Volunteers help in many different roles including in healthcare. Contacts Editor Linda Anderman Email Community Programs Office Kurt Steinhaus Email So far, employees and retirees have volunteered more than 1.2 million volunteer hours. If you are a nonprofit organization that has Lab employees or retirees as

322

"Tier","PRIORITY","Total Tickets Logged","Tickets Closed","Currently...  

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

"TOTAL",,255,261,0 "SCR",,255,255,0 ,,0.9843137255,0.9616858238 "Total Issues Report - ESS",,,,"20120101 - 20120418" "Tier","PRIORITY","Total Tickets Logged","Tickets...

323

UMD WebAssign -General Information Logging into the WebAssign system  

E-Print Network [OSTI]

UMD WebAssign - General Information · Logging into the WebAssign system o If you registered for the course later than the day before classes started you will not yet be enrolled in the course on Web

Johnson, Raymond L.

324

Interpretation of some wireline logs in geothermal fields of the Imperial Valley, California  

SciTech Connect (OSTI)

This study reviews the wireline log responses of some geothermal fields in the Imperial Valley, California. The fields under study include the Heber, the East Mesa, the Brawley and the Westmoreland. The selected well logs obtained under special arrangements with the operators were chosen to maintain the anonymity of specific well locations but are only representative of each area. Analysis of the well logs indicate that on an individual field basis, the well logs are excellent for correlation purposes. The presence of extremely saline fluids in some fields precludes the monitoring of Q /SUB V/ profile for detection of hydrothermally altered zones. The producing sections in all the fields are characterized by low porosity and high resistivity.

Ershaghi, I.; Abdassah, D.

1983-03-01T23:59:59.000Z

325

In cooperation with the University of Waterloo, Canada Application of Advanced Geophysical Logging Methods  

E-Print Network [OSTI]

.S. Geological Survey #12;2 Figure 1. Location of Rocketdyne Santa Susana Field Laboratory and logged boreholes sandstone and mudstone at the Rocketdyne Santa Susana Field ,, in southern Ventura County, California (fig

Singha, Kamini

326

Approximate Effects of Off-Center Acoustic Sondes and Elliptic Boreholes Upon Full Waveform Logs  

E-Print Network [OSTI]

Full waveform acoustic well logging has become instrumental to hydrocarbon exploration because of its ability to determine in situ velocity information for P and S waves as well as the attenuation (or absorption) of seismic ...

Willis, M. E.

1983-01-01T23:59:59.000Z

327

Characteristic fuel consumption and exhaust emissions in fully mechanized logging operations  

Science Journals Connector (OSTI)

A study was done using eight different logging machines (harvesters and forwarders) in clear-felling operations to quantify the associated fuel consumption, and to define the inherent relationship between engine ...

Radomir Klvac; Alois Skoupy

2009-12-01T23:59:59.000Z

328

Lithology and well log study of Campbell E-2 geothermal test...  

Open Energy Info (EERE)

well log study of Campbell E-2 geothermal test well, Humboldt House geothermal prospect, Pershing County, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library...

329

Formation evaluation using wavelet analysis on logs of the Chinji and Nagri Formations, northern Pakistan  

E-Print Network [OSTI]

The relatively new method of using wavelets in well log analysis is a powerful tool for defining multiple superimposed scales of lithic trends and contacts. Interpreting depositional processes associated with different scales of vertical variation...

Tanyel, Emre Doruk

2006-10-30T23:59:59.000Z

330

Correction of non-equilibrated temperature logs and implications for geothermal investigations  

Science Journals Connector (OSTI)

Optimum data for any geothermal investigation are densely sampled, high precision temperature logs from boreholes. They should represent the formation temperature as accurately as possible. Often, temperature measurements influenced by the drilling process and the circulation do not have the quality which is required for geothermal methods. Horner's method is a widely used correction method that is based on analysis of a time series of temperature observations. Mostly, these data are not available and a correction is therefore not possible. The approach presented here enables us to correct entire temperature logs even if no repeat measurements were carried out. This is achieved by combination of the theory of Horner's method with estimates for radial heat flow. Given a large number of technically perturbed logs this new approach enlarges considerably the potential database suitable for geothermal methods. The implications for two important fields of application are also discussed. These are fluid flow analysis and analysis of the ground surface temperature history on temperature logs.

Andrei Zschocke

2005-01-01T23:59:59.000Z

331

Using Domain Models for Context-Rich User Logging Stephen Dignum  

E-Print Network [OSTI]

Traversal, User Logging 1. INTRODUCTION Searches within document collections like intranets differ from amount of time is spent by users trying to learn the domain characteristics even before they are able

Kruschwitz, Udo

332

Station location map and audio-magnetotelluric data log for Rye...  

Open Energy Info (EERE)

location map and audio-magnetotelluric data log for Rye Patch known geothermal resource area Jump to: navigation, search OpenEI Reference LibraryAdd to library Map: Station...

333

E-print Network Web Log News: Research Communications for Scientists...  

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

Website Policies and Important Links E-print Web Log E-print Network News E-print Network About Search Browse by Discipline Find Scientific Societies Receive E-print Alerts Contact...

334

ITTF-016 Website Development-Maintenance Log 09_0909 EOTA - Business Form  

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

6 Website Development-Maintenance Log 09_0909 6 Website Development-Maintenance Log 09_0909 EOTA - Business Form Document Title: ITTP-015 Web Site Development / Maintenance Document Number: Website Development and Maintenance log ITT Melissa Otero N/A Referenced Documents: Parent Document: ITTF-016 Rev. 11_0419 Approvers: Melissa Otero Document Owner: Ben Aragon Backup Owner: Notify of Changes: A B 08_0818 Revision History: Rev. Description of Change Intitial Release. Added headings to address to include: Performance Requirements, Statutory and Regulatory Requirements, Information from Previous Similar Designs, and Other Requirements. Added additional column to indicate "Estimated Completion Date" of WSD projects. "Design Verification Complete" and "Design Validation Complete" columns removed from log.

335

Gamma ray bursts ROBERT S MACKAY  

E-Print Network [OSTI]

Gamma ray bursts ROBERT S MACKAY COLIN ROURKE We propose that a gamma ray burst is a kinematic Gamma ray bursts are intense flashes of electromagnetic radiation of cosmic origin lasting from ten accepted mechanism. We propose that a gamma ray burst is simply a kinematic effect, namely the effect

Rourke, Colin

336

Study Z gamma events and limits on anomalous ZZ gamma and Z gamma gamma couplings in pp(-) collisions at root s=1.96 Tev  

E-Print Network [OSTI]

We present a measurement of the Z gamma production cross section and limits on anomalous ZZ gamma and Z gamma gamma couplings for form-factor scales of Lambda=750 and 1000 GeV. The measurement is based on 138 (152) candidates ...

Baringer, Philip S.; Bean, Alice; Christofek, L.; Coppage, Don; Gardner, J.; Hensel, Carsten; Jabeen, S.; Wilson, Graham Wallace

2005-07-01T23:59:59.000Z

337

Modeling gamma-ray bursts.  

E-Print Network [OSTI]

??Discovered serendipitously in the late 1960s, gamma-ray bursts (GRBs) are huge explosions of energy that happen at cosmological distances. They provide a grand physical playground (more)

Maxham, Amanda

2011-01-01T23:59:59.000Z

338

Emission formation during wood log combustion in fireplaces ?? part I: volatile combustion stage  

Science Journals Connector (OSTI)

A CFD-based tool for the analysis of combustion and emissions in batch-fired wood log combustion is introduced. It consists of submodels for drying and pyrolysis of a wood log, for combustion of volatilised fuel and char, for radiative heat transfer, and for NO formation implemented in a commercial CFD-programme (Fluent) for turbulent flows. Comparing model predictions to experimental data in a test oven shows the applicability of the different submodels and combination of them.

M. Huttunen; J. Saastamoinen; P. Kilpinen; L. Kjaldman; H. Oravainen; S. Bostrom

2006-01-01T23:59:59.000Z

339

Gamma radiation field intensity meter  

DOE Patents [OSTI]

A gamma radiation intensity meter measures dose rate of a radiation field. The gamma radiation intensity meter includes a tritium battery emitting beta rays generating a current which is essentially constant. Dose rate is correlated to an amount of movement of an electroscope element charged by the tritium battery. Ionizing radiation decreases the voltage at the element and causes movement. A bleed resistor is coupled between the electroscope support element or electrode and the ionization chamber wall electrode. 4 figs.

Thacker, L.H.

1995-10-17T23:59:59.000Z

340

Gamma radiation field intensity meter  

DOE Patents [OSTI]

A gamma radiation intensity meter measures dose rate of a radiation field. The gamma radiation intensity meter includes a tritium battery emitting beta rays generating a current which is essentially constant. Dose rate is correlated to an amount of movement of an electroscope element charged by the tritium battery. Ionizing radiation decreases the voltage at the element and causes movement. A bleed resistor is coupled between the electroscope support element or electrode and the ionization chamber wall electrode. 4 figs.

Thacker, L.H.

1994-08-16T23:59:59.000Z

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


341

Gamma radiation field intensity meter  

DOE Patents [OSTI]

A gamma radiation intensity meter measures dose rate of a radiation field. The gamma radiation intensity meter includes a tritium battery emitting beta rays generating a current which is essentially constant. Dose rate is correlated to an amount of movement of an electroscope element charged by the tritium battery. Ionizing radiation decreases the voltage at the element and causes movement. A bleed resistor is coupled between the electroscope support element or electrode and the ionization chamber wall electrode.

Thacker, Louis H. (Knoxville, TN)

1995-01-01T23:59:59.000Z

342

Gamma radiation field intensity meter  

DOE Patents [OSTI]

A gamma radiation intensity meter measures dose rate of a radiation field. The gamma radiation intensity meter includes a tritium battery emitting beta rays generating a current which is essentially constant. Dose rate is correlated to an amount of movement of an electroscope element charged by the tritium battery. Ionizing radiation decreases the voltage at the element and causes movement. A bleed resistor is coupled between the electroscope support element or electrode and the ionization chamber wall electrode.

Thacker, Louis H. (Knoxville, TN)

1994-01-01T23:59:59.000Z

343

On the possible effects of gluon number fluctuations on {gamma}{gamma} collisions at high energies  

SciTech Connect (OSTI)

We investigate the effects of the fluctuations on the total {gamma}{gamma}, {gamma}*{gamma}* cross sections and the real photon structure function F{sup {gamma}}{sub 2}(x,Q{sup 2}), considering a saturation phenomenological model for the dipole-dipole cross section and scattering amplitude with fluctuations included.

Goncalves, V. P.; De Santana Amaral, J. T. [Instituto de Fisica e Matematica, Universidade Federal de Pelotas, Caixa Postal 354, 96010-900, Pelotas, RS (Brazil)

2013-03-25T23:59:59.000Z

344

Gamma-RayGamma-Ray Bursts: from SwiftBursts: from Swift  

E-Print Network [OSTI]

Gamma-RayGamma-Ray Bursts: from SwiftBursts: from Swift to GLASTto GLAST Bing ZhangBing ZhangGehrels, et al), et al) #12;Gamma-ray bursts: the mostGamma-ray bursts: the most violent explosions fireball central photosphere internal external shocks engine (shocks) (reverse) (forward) gamma-ray UV

California at Santa Cruz, University of

345

Results of investigations at the Zunil geothermal field, Guatemala: Well logging and brine geochemistry  

SciTech Connect (OSTI)

The well logging team from Los Alamos and its counterpart from Central America were tasked to investigate the condition of four producing geothermal wells in the Zunil Geothermal Field. The information obtained would be used to help evaluate the Zunil geothermal reservoir in terms of possible additional drilling and future power plant design. The field activities focused on downhole measurements in four production wells (ZCQ-3, ZCQ-4, ZCQ-5, and ZCQ-6). The teams took measurements of the wells in both static (shut-in) and flowing conditions, using the high-temperature well logging tools developed at Los Alamos National Laboratory. Two well logging missions were conducted in the Zunil field. In October 1988 measurements were made in well ZCQ-3, ZCQ-5, and ZCQ-6. In December 1989 the second field operation logged ZCQ-4 and repeated logs in ZCQ-3. Both field operations included not only well logging but the collecting of numerous fluid samples from both thermal and nonthermal waters. 18 refs., 22 figs., 7 tabs.

Adams, A.; Dennis, B.; Van Eeckhout, E.; Goff, F.; Lawton, R.; Trujillo, P.E.; Counce, D.; Archuleta, J. (Los Alamos National Lab., NM (USA)); Medina, V. (Instituto Nacional de Electrificacion, Guatemala City (Guatemala). Unidad de Desarollo Geotermico)

1991-07-01T23:59:59.000Z

346

An Analytical Expression for the Hubble diagram of supernovae and gamma-ray bursts  

E-Print Network [OSTI]

A recent paper by Harmut Traunm\\"uller shows that the most adequate equation to interpret the observations on magnitude and redshift from 892 type 1a supernovae would be mu = 5 log[(1+z) ln(1+z)] + const. We discuss this result which is exacly the one we have obtained few years ago when postulating a relation between the speed of light and the expansion of the universe. We also compare our analytical result to the conclusion of Marosi who studied 280 supernovae and gamma-ray bursts in the range 0.1014 < z < 8.1. The difference between his results and ours is at worst of 0.3 %.

Jean-Marie Vigoureux; Bernard Vigoureux; Michel Langlois

2014-11-12T23:59:59.000Z

347

An Analytical Expression for the Hubble diagram of supernovae and gamma-ray bursts  

E-Print Network [OSTI]

A recent paper by Harmut Traunm\\"uller shows that the most adequate equation to interpret the observations on magnitude and redshift from 892 type 1a supernovae would be mu = 5 log[(1+z) ln(1+z)] + const. We discuss this result which is exacly the one we have obtained few years ago when postulating a relation between the speed of light and the expansion of the universe. We also compare our analytical result to the conclusion of Marosi who studied 280 supernovae and gamma-ray bursts in the range 0.1014 < z < 8.1. The difference between his results and ours is at worst of 0.3 %.

Vigoureux, Jean-Marie; Langlois, Michel

2014-01-01T23:59:59.000Z

348

Flux and Photon Spectral Index Distributions of Fermi-LAT Blazars and Contribution to the Extragalactic Gamma-ray Background  

SciTech Connect (OSTI)

We present a determination of the distributions of gamma-ray flux - the so called LogN-LogS relation - and photon spectral index for the 352 blazars detected with a greater than approximately seven sigma detection threshold and located above {+-} 20{sup o} Galactic latitude by the Large Area Telescope of the Fermi Gamma-ray Space Telescope in its first year catalog. Because the flux detection threshold depends on the photon index, the observed raw distributions do not provide the true LogN-LogS counts or the true distribution of the photon index. We use the non-parametric methods developed by Efron and Petrosian to reconstruct the intrinsic distributions from the observed ones which account for the data truncations introduced by observational bias and includes the effects of the possible correlation among the two variables. We demonstrate the robustness of our procedures using a simulated data set of blazars and then apply these to the real data and find that for the population as a whole the intrinsic flux distribution can be represented by a broken power law of slopes -2.37 {+-} 0.13 and -1.70 {+-} 0.26, and the intrinsic photon index distribution can be represented by a Gaussian with mean 2.41 {+-} 0.13 and 1{sigma} width of 0.25 {+-} 0.03. We also find the intrinsic distributions for the sub-populations of BL Lac and FSRQs type blazars separately. We then calculate the contribution of blazars to the diffuse cosmic gamma-ray background radiation to be 28% {+-} 19%.

Singal, J.; /KIPAC, Menlo Park /SLAC /Stanford U.; Petrosian, V.; /KIPAC, Menlo Park /SLAC /Stanford U., Phys. Dept. /Stanford U., Appl. Phys. Dept.; Ajello, M.; /KIPAC, Menlo Park /SLAC /Stanford U.

2011-12-09T23:59:59.000Z

349

System for imaging plutonium through heavy shielding  

SciTech Connect (OSTI)

A single pinhole can be used to image strong self-luminescent gamma-ray sources such as plutonium on gamma scintillation (Anger) cameras. However, if the source is weak or heavily shielded, a poor signal to noise ratio can prevent acquisition of the image. An imaging system designed and built at Los Alamos National Laboratory uses a coded aperture to image heavily shielded sources. The paper summarizes the mathematical techniques, based on the Fast Delta Hadamard transform, used to decode raw images. Practical design considerations such as the phase of the uniformly redundant aperture and the encoded image sampling are discussed. The imaging system consists of a custom designed m-sequence coded aperture, a Picker International Corporation gamma scintillation camera, a LeCroy 3500 data acquisition system, and custom imaging software. The paper considers two sources - 1.5 mCi /sup 57/Co unshielded at a distance of 27 m and 220 g of bulk plutonium (11.8% /sup 240/Pu) with 0.3 cm lead, 2.5 cm steel, and 10 cm of dense plastic material at a distance of 77.5 cm. Results show that the location and geometry of a source hidden in a large sealed package can be determined without having to open the package. 6 references, 4 figures.

Kuckertz, T.H.; Cannon, T.M.; Fenimore, E.E.; Moss, C.E.; Nixon, K.V.

1984-04-01T23:59:59.000Z

350

Characteristics of the nuclear magnetic resonance logging response in fracture oil and gas reservoirs  

Science Journals Connector (OSTI)

Fracture oil and gas reservoirs exist in large numbers. The accurate logging evaluation of fracture reservoirs has puzzled petroleum geologists for a long time. Nuclear magnetic resonance (NMR) logging is an effective new technology for borehole measurement and formation evaluation. It has been widely applied in non-fracture reservoirs, and good results have been obtained. But its application in fracture reservoirs has rarely been reported in the literature. This paper studies systematically the impact of fracture parameters (width, number, angle, etc), the instrument parameter (antenna length) and the borehole condition (type of drilling fluid) on NMR logging by establishing the equation of the NMR logging response in fracture reservoirs. First, the relationship between the transverse relaxation time of fluid-saturated fracture and fracture aperture inthe condition of different transverse surface relaxation rates was analyzed; then, the impact of the fracture aperture, dip angle, length of two kinds of antennas and mud type was calculated through forward modeling and inversion. The results show that the existence of fractures affects the NMR logging; the characteristics of the NMR logging response become more obvious with increasing fracture aperture and number of fractures. It is also found that T2 distribution from the fracture reservoir will be affected by echo spacing, type of drilling fluids and length of antennas. A long echo spacing is more sensitive to the type of drilling fluid. A short antenna is more effective for identifying fractures. In addition, the impact of fracture dip angle on NMR logging is affected by the antenna length.

Lizhi Xiao; Kui Li

2011-01-01T23:59:59.000Z

351

AGATA - Advanced Gamma Tracking Array  

E-Print Network [OSTI]

The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realization of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly-segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterization of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximize its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer.

S. Akkoyun; A. Algora; B. Alikhani; F. Ameil; G. de Angelis; L. Arnold; A. Astier; A. Ata; Y. Aubert; C. Aufranc; A. Austin; S. Aydin; F. Azaiez; S. Badoer; D. L. Balabanski; D. Barrientos; G. Baulieu; R. Baumann; D. Bazzacco; F. A. Beck; T. Beck; P. Bednarczyk; M. Bellato; M. A. Bentley; G. Benzoni; R. Berthier; L. Berti; R. Beunard; G. Lo Bianco; B. Birkenbach; P. G. Bizzeti; A. M. Bizzeti-Sona; F. Le Blanc; J. M. Blasco; N. Blasi; D. Bloor; C. Boiano; M. Borsato; D. Bortolato; A. J. Boston; H. C. Boston; P. Bourgault; P. Boutachkov; A. Bouty; A. Bracco; S. Brambilla; I. P. Brawn; A. Brondi; S. Broussard; B. Bruyneel; D. Bucurescu; I. Burrows; A. Brger; S. Cabaret; B. Cahan; E. Calore; F. Camera; A. Capsoni; F. Carri; G. Casati; M. Castoldi; B. Cederwall; J. -L. Cercus; V. Chambert; M. El Chambit; R. Chapman; L. Charles; J. Chavas; E. Clment; P. Cocconi; S. Coelli; P. J. Coleman-Smith; A. Colombo; S. Colosimo; C. Commeaux; D. Conventi; R. J. Cooper; A. Corsi; A. Cortesi; L. Costa; F. C. L. Crespi; J. R. Cresswell; D. M. Cullen; D. Curien; A. Czermak; D. Delbourg; R. Depalo; T. Descombes; P. Dsesquelles; P. Detistov; C. Diarra; F. Didierjean; M. R. Dimmock; Q. T. Doan; C. Domingo-Pardo; M. Doncel; F. Dorangeville; N. Dosme; Y. Drouen; G. Duchne; B. Dulny; J. Eberth; P. Edelbruck; J. Egea; T. Engert; M. N. Erduran; S. Ertrk; C. Fanin; S. Fantinel; E. Farnea; T. Faul; M. Filliger; F. Filmer; Ch. Finck; G. de France; A. Gadea; W. Gast; A. Geraci; J. Gerl; R. Gernhuser; A. Giannatiempo; A. Giaz; L. Gibelin; A. Givechev; N. Goel; V. Gonzlez; A. Gottardo; X. Grave; J. Gr?bosz; R. Griffiths; A. N. Grint; P. Gros; L. Guevara; M. Gulmini; A. Grgen; H. T. M. Ha; T. Habermann; L. J. Harkness; H. Harroch; K. Hauschild; C. He; A. Hernndez-Prieto; B. Hervieu; H. Hess; T. Hyk; E. Ince; R. Isocrate; G. Jaworski; A. Johnson; J. Jolie; P. Jones; B. Jonson; P. Joshi; D. S. Judson; A. Jungclaus; M. Kaci; N. Karkour; M. Karolak; A. Ka?ka?; M. Kebbiri; R. S. Kempley; A. Khaplanov; S. Klupp; M. Kogimtzis; I. Kojouharov; A. Korichi; W. Korten; Th. Krll; R. Krcken; N. Kurz; B. Y. Ky; M. Labiche; X. Lafay; L. Lavergne; I. H. Lazarus; S. Leboutelier; F. Lefebvre; E. Legay; L. Legeard; F. Lelli; S. M. Lenzi; S. Leoni; A. Lermitage; D. Lersch; J. Leske; S. C. Letts; S. Lhenoret; R. M. Lieder; D. Linget; J. Ljungvall; A. Lopez-Martens; A. Lotod; S. Lunardi; A. Maj; J. van der Marel; Y. Mariette; N. Marginean; R. Marginean; G. Maron; A. R. Mather; W. M?czy?ski; V. Mendz; P. Medina; B. Melon; R. Menegazzo; D. Mengoni; E. Merchan; L. Mihailescu; C. Michelagnoli; J. Mierzejewski; L. Milechina; B. Million; K. Mitev; P. Molini; D. Montanari; S. Moon; F. Morbiducci; R. Moro; P. S. Morrall; O. Mller; A. Nannini; D. R. Napoli; L. Nelson; M. Nespolo; V. L. Ngo; M. Nicoletto; R. Nicolini; Y. Le Noa; P. J. Nolan; M. Norman; J. Nyberg; A. Obertelli; A. Olariu; R. Orlandi; D. C. Oxley; C. zben; M. Ozille; C. Oziol; E. Pachoud; M. Palacz; J. Palin; J. Pancin; C. Parisel; P. Pariset; G. Pascovici; R. Peghin; L. Pellegri; A. Perego; S. Perrier; M. Petcu; P. Petkov; C. Petrache; E. Pierre; N. Pietralla; S. Pietri; M. Pignanelli; I. Piqueras; Z. Podolyak; P. Le Pouhalec; J. Pouthas; D. Pugnre; V. F. E. Pucknell; A. Pullia; B. Quintana; R. Raine; G. Rainovski; L. Ramina; G. Rampazzo; G. La Rana; M. Rebeschini; F. Recchia; N. Redon; M. Reese; P. Reiter; P. H. Regan; S. Riboldi; M. Richer; M. Rigato; S. Rigby; G. Ripamonti; A. P. Robinson; J. Robin; J. Roccaz; J. -A. Ropert; B. Ross; C. Rossi Alvarez; D. Rosso; B. Rubio; D. Rudolph; F. Saillant; E. ?ahin; F. Salomon; M. -D. Salsac; J. Salt; G. Salvato; J. Sampson; E. Sanchis; C. Santos; H. Schaffner; M. Schlarb; D. P. Scraggs; D. Seddon; M. ?enyi?it; M. -H. Sigward; G. Simpson; J. Simpson; M. Slee; J. F. Smith; P. Sona; B. Sowicki; P. Spolaore; C. Stahl; T. Stanios; E. Stefanova; O. Stzowski; J. Strachan; G. Suliman; P. -A. Sderstrm; J. L. Tain; S. Tanguy; S. Tashenov; Ch. Theisen; J. Thornhill; F. Tomasi; N. Toniolo; R. Touzery; B. Travers; A. Triossi; M. Tripon; K. M. M. Tun-Lano; M. Turcato; C. Unsworth; C. A. Ur; J. J. Valiente-Dobon; V. Vandone; E. Vardaci; R. Venturelli; F. Veronese; Ch. Veyssiere; E. Viscione; R. Wadsworth; P. M. Walker; N. Warr; C. Weber; D. Weisshaar; D. Wells; O. Wieland; A. Wiens; G. Wittwer; H. J. Wollersheim; F. Zocca; N. V. Zamfir; M. Zi?bli?ski; A. Zucchiatti

2011-11-24T23:59:59.000Z

352

Gamma Industry Processing Alliance Overview | Department of Energy  

Office of Environmental Management (EM)

Gamma Industry Processing Alliance Overview Gamma Industry Processing Alliance Overview Gamma Industry Processing Alliance Overview More Documents & Publications 2011 NTSF Meeting...

353

Swift's Ability to Detect Gamma-Ray Bursts  

E-Print Network [OSTI]

The Swift satellite will be a self-contained observatory that will bring new capabilities to the observing of the early afterglow emission of Gamma-ray Bursts. Swift is completely autonomous and will do all of the observations without help from the ground. There are three instruments on Swift. A large (5200 sq cm) coded aperture imager will locate the bursts within about 15 seconds. The satellite will be able to slew to point at the location within a minute or two. There are two narrow field of view instruments: an optical telescope and an x-ray telescope. Thus, Swift will provide simultaneous gamma-ray, x-ray, and optical observations of Gamma-ray bursts soon after the burst. A key to the success of Swift will be its ability to detect and locate a large number of gamma-ray bursts quick enough that the narrow field of view instruments can follow up. The results of simulations show that Swift will be able to detect about 300 bursts a year and locate about 150. The number that Swift will be able to slew to depe...

Fenimore, E E; Palmer, D; Barthelmy, S D; Gehrels, N; Krimm, H A; Markwardt, C B; Parsons, A; Stephens, M; Tller, J

2004-01-01T23:59:59.000Z

354

The neutron-gamma Feynman variance to mean approach: gamma detection and total neutron-gamma detection (theory and practice)  

E-Print Network [OSTI]

Two versions of the neutron-gamma variance to mean (Feynman-alpha method or Feynman-Y function) formula for either gamma detection only or total neutron-gamma detection, respectively, are derived and compared in this paper. The new formulas have a particular importance for detectors of either gamma photons or detectors sensitive to both neutron and gamma radiation. If applied to a plastic or liquid scintillation detector, the total neutron-gamma detection Feynman-Y expression corresponds to a situation where no discrimination is made between neutrons and gamma particles. The gamma variance to mean formulas are useful when a detector of only gamma radiation is used or when working with a combined neutron-gamma detector at high count rates. The theoretical derivation is based on the Chapman-Kolmogorov equation with inclusion of general reactions and passage intensities for neutrons and gammas, but with the inclusion of prompt reactions only. A one energy group approximation is considered. The comparison of the two different theories is made by using reaction intensities obtained in MCNPX simulations with a simplified geometry for two scintillation detectors and a 252Cf-source enclosed in a steel container. In addition, the variance to mean ratios, neutron, gamma and total neutron-gamma, are evaluated experimentally for a weak 252Cf neutron-gamma source in a steel container, a 137Cs random gamma source and a 22Na correlated gamma source. Due to the focus being on the possibility of using neutron-gamma variance to mean theories for both reactor and safeguards applications, we limited the present study to the general analytical expressions for Feynman-Y formulas.

Dina Chernikova; Kre Axell; Senada Avdic; Imre Pzsit; Anders Nordlund

2015-01-23T23:59:59.000Z

355

Coal log pipeline research at University of Missouri. 3rd quarterly report for 1995, July 1, 1995--September 30, 1995  

SciTech Connect (OSTI)

During this quarter (1/1/95-9/30/95), major progress has been made in the following areas of coal log pipeline research, development and technology transfer: (1) Conceptual design of a test machine based on hydraulic presses to mass-produce 5.4-inch-diameter coal logs for testing in a 6-inch-diameter pipeline has been completed. (2) Conceptual design of a rotary-press machine to produce 1.9-inch-diameter coal logs for testing in a 2-inch-diameter pipeline has also been completed. (3) It has been confirmed through experiments that molds with round-edge exit can make logs as good as those made with tapered exit. (4) Conducted a study to determine the effect of surface condition of mold and lubricants on the quality of coal logs. (5) Completed an evaluation of the effect of fiber (wood pulp) on coal log quality. (6) Prepared an apparatus for testing fast compaction of coal logs -- 2 second per log. (7) Compacted coal logs in a 5.3-inch-diameter mold. (8) Completed a preliminary study to assess vacuum and steam heating systems to enhance coal log production and quality. (9) Changed the small-scale-CLP-demo loop from a once-through system to a recirculating system. (10) Completed revision of CLP economic model and revised the 1993 report.

Liu, H.

1995-12-31T23:59:59.000Z

356

Gamma ray bursts: The future  

Science Journals Connector (OSTI)

Gamma-ray bursts are the most dramatic and powerful cosmic explosions known. They also continue to be the most puzzling. Thanks to breakthrough observations over the last decade however a picture has emerged of gamma-ray bursts being at cosmological distances and capable of releasing more than 10 51 ergs of energy within seconds. Despite the emergence of this picture the physical origin of bursts is still unknown and the classification of different types of bursts is still in its infancy. Further understanding of gamma-ray bursts requires the wise use of our current resources and the development of new observational capabilities. We outline the current state of our knowledge of bursts and describe the present and future instrumentation which will enable us to understand these baffling blasts.

N. Gehrels; D. Macomb

2000-01-01T23:59:59.000Z

357

LOW COMPLEXITY RST INVARIANT IMAGE RECOGNITION USING FOURIER MELLIN TRANSFORM  

E-Print Network [OSTI]

recognition device. The RST compensation method is based on Fourier- Mellin Transform (FMT) which we implementLOW COMPLEXITY RST INVARIANT IMAGE RECOGNITION USING FOURIER MELLIN TRANSFORM P. Ayyalasomayajula efficiently using log-polar grid interpolation. This RST compensation method is used in conjunction

Lenstra, Arjen K.

358

Neutrinos from Gamma Ray Bursts  

E-Print Network [OSTI]

We show that the detection of neutrinos from a typical gamma ray burst requires a kilometer-scale detector. We argue that large bursts should be visible with the neutrino telescopes under construction. We emphasize the 3 techniques by which neutrino telescopes can perform this search: by triggering on i) bursts of muons from muon neutrinos, ii) muons from air cascades initiated by high energy gamma rays and iii) showers made by relatively low energy ($\\simeq 100\\,\\mev$) electron neutrinos. Timing of neutrino-photon coincidences may yield a measurement of the neutrino mass to order $10^{-5}$~eV, an interesting range in light of the solar neutrino anomaly.

F. Halzen; G. Jaczko

1996-02-07T23:59:59.000Z

359

sin 2 beta + gamma Measurements  

SciTech Connect (OSTI)

I report on the most recent measurements done to constrain sin(2{beta}+{gamma}) with neutral B mesons. Direct measurements of 2{beta} + {gamma} will provide a precise test of the standard model predictions with higher statistics. Present constraints come from studies of B {yields} D{sup (*){+-}}{pi}{sup {-+}}/{rho}{sup {-+}} decays done by BABAR and Belle collaborations with full and inclusive techniques to reconstruct B mesons. B {yields} D{sup 0(*)}K{sup 0} decays are also very promising but statistics are too low to give any constraint at the moment.

Therin, G; /Paris U., VI-VII

2005-06-24T23:59:59.000Z

360

Imaging alpha particle detector  

DOE Patents [OSTI]

A method and apparatus for detecting and imaging alpha particles sources is described. A dielectric coated high voltage electrode and a tungsten wire grid constitute a diode configuration discharge generator for electrons dislodged from atoms or molecules located in between these electrodes when struck by alpha particles from a source to be quantitatively or qualitatively analyzed. A thin polyester film window allows the alpha particles to pass into the gas enclosure and the combination of the glass electrode, grid and window is light transparent such that the details of the source which is imaged with high resolution and sensitivity by the sparks produced can be observed visually as well. The source can be viewed directly, electronically counted or integrated over time using photographic methods. A significant increase in sensitivity over other alpha particle detectors is observed, and the device has very low sensitivity to gamma or beta emissions which might otherwise appear as noise on the alpha particle signal.

Anderson, D.F.

1980-10-29T23:59:59.000Z

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


361

Imaging alpha particle detector  

DOE Patents [OSTI]

A method and apparatus for detecting and imaging alpha particles sources is described. A conducting coated high voltage electrode (1) and a tungsten wire grid (2) constitute a diode configuration discharge generator for electrons dislodged from atoms or molecules located in between these electrodes when struck by alpha particles from a source (3) to be quantitatively or qualitatively analyzed. A thin polyester film window (4) allows the alpha particles to pass into the gas enclosure and the combination of the glass electrode, grid and window is light transparent such that the details of the source which is imaged with high resolution and sensitivity by the sparks produced can be observed visually as well. The source can be viewed directly, electronically counted or integrated over time using photographic methods. A significant increase in sensitivity over other alpha particle detectors is observed, and the device has very low sensitivity to gamma or beta emissions which might otherwise appear as noise on the alpha particle signal.

Anderson, David F. (Los Alamos, NM)

1985-01-01T23:59:59.000Z

362

GAMUT: A computer code for. gamma. -ray energy and intensity analysis  

SciTech Connect (OSTI)

GAMUT is a computer code to analyze {gamma}-ray energies and intensities. It does a linear least-squares fit of measured {gamma}-ray energies from one or more experiments to the level scheme. GAMUT also performs a non-linear least-squares analysis of branching intensities. For both energy and intensity data, a statistical Chi-square analysis is performed with an iterative uncertainty adjustment. The uncertainties of outlying measured values and sets of measurements with x{sup 2}/f>1 are increased, and the calculation is repeated until the uncertainties are consistent with the fitted values. GAMUT accepts input from standard or special-format ENSDF data sets. The special-format ENSDF data sets were designed to permit analysis of more than one set of measurements associated with a single ENSDF data set. GAMUT prepares a standard ENSDF format output data set containing the adjusted values. If more than one input ENSDF data set is provided, GAMUT creates an ADOPTED LEVELS, GAMMAS data set containing the adjusted level and {gamma}-ray energies and branching intensities from each level normalized to 100 for the strongest {gamma}-ray. GAMUT also provides a summary of the results and an extensive log of the iterative analysis. GAMUT is interactive prompting the user for input and output file names and for default calculation options. This version of GAMUT has adjustable dimensions so that any maximum number of data sets, levels, and {gamma}-rays can be established at the time of implementation. 6 refs.

Firestone, R.B.

1991-05-01T23:59:59.000Z

363

Resistivity Log At Alum Area (Moos & Ronne, 2010) | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit History Facebook icon Twitter icon » Resistivity Log At Alum Area (Moos & Ronne, 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Single-Well and Cross-Well Resistivity At Alum Geothermal Area (Moos & Ronne, 2010) Exploration Activity Details Location Alum Geothermal Area Exploration Technique Single-Well and Cross-Well Resistivity Activity Date Usefulness useful DOE-funding Unknown Notes Density and electrical resistivity data were important to calibrate structural models based on surface surveys. Fluid flow appeared to be concentrated beneath the detachment within an interval in which some mud losses occurred while drilling, and shallow-reading resistivity logs recorded much lower values than deeper-reading logs suggesting that

364

Tiny images  

E-Print Network [OSTI]

The human visual system is remarkably tolerant to degradations in image resolution: in a scene recognition task, human performance is similar whether $32 \\times 32$ color images or multi-mega pixel images are used. With ...

Torralba, Antonio

2007-04-23T23:59:59.000Z

365

Gamma Ray Burst and Soft Gamma Repeaters. Spinning, Precessing Gamma Jets  

E-Print Network [OSTI]

Gamma Ray Bursts as recent GRB990123 and GRB990510 are observed to occur in cosmic volumes with a corresponding output reaching, for isotropic explosions, energies as large as two solar masses annihilation. These energies are underestimated because of the neglected role of comparable ejected neutrinos bursts. These extreme power cannot be explained with any standard spherically symmetric Fireball model. A too heavy black hole or Star would be unable to coexist with the shortest millisecond time structure of Gamma ray Burst. Beaming of the gamma radiation may overcome the energy puzzle. However any mild explosive beam $(\\Omega > 10^{-2})$ should not solve the jet containment at those disruptive energies. Only extreme beaming $(\\Omega < 10^{-8})$, by a slow decaying, but long-lived precessing jet, it may coexist with characteristic Supernova energies, apparent GRBs output, statistics as well as their connection with older and nearer SGRs relics.

Daniele Fargion

1999-06-28T23:59:59.000Z

366

Long-term Carbon Loss and Recovery Following Selective Logging in Amazon Forests  

SciTech Connect (OSTI)

Amazon deforestation contributes significantly to global carbon (C) emissions. In comparison, the contribution from selective logging to atmospheric CO2 emissions, and its impact on regional C dynamics, is highly uncertain. Using a new geographically-based modeling approach in combination with high resolution remote sensing data from 1999-2002, we estimate that C emissions were 0.04 0.05 Pg C yr-1 due to selective logging from a ~2,664,960 km2 region of the Brazilian Amazon. Selective logging was responsible for 15-19% higher carbon emissions than reported from deforestation (clear-cutting) alone. Our simulations indicated that forest carbon lost via selective logging lasts two to three decades following harvest, and that the original live biomass takes up to a century to recover, if the forests are not subsequently cleared. The two- to three-decade loss of carbon results from the biomass damaged by logging activities, including leaves, wood, and roots, estimated to be 89.1 Tg C yr-1 from 1999-2002 over the study region, leaving 70.0 Tg C yr-1 and 7.9 Tg C yr-1 to accumulate as coarse woody debris and soil C, respectively. While avoided deforestation is central to crediting rainforest nations for reduced carbon emissions, the extent and intensity of selective logging are also critical to determining carbon emissions in the context of Reduced Emissions from Deforestation and Forest Degradation (REDD). We show that a combination of automated high-resolution satellite monitoring and detailed forest C modeling can yield spatially explicit estimates of harvest related C losses and subsequent recovery in support of REDD and other international carbon market mechanisms.

Huang, Maoyi; Asner, Gregory P.

2010-09-30T23:59:59.000Z

367

Essay on the gamma ray laser  

E-Print Network [OSTI]

This work discusses the possibility of inducing the emission of gamma radiation from nuclear isomers by two-photon transitions, in the more general context of the problem of the amplification of gamma radiation.

Silviu Olariu

1999-07-18T23:59:59.000Z

368

Coal log pipeline research at University of Missouri. Fourth quarterly report for 1995, October 1, 1995--December 30, 1995  

SciTech Connect (OSTI)

The purpose of this project is to design and develop fast and efficient machines for manufacturing high quality coal logs. During the last three months, efforts were focused on the revision and improvement of the design of the 300-ton hydraulic press machine for coal log production. The conceptual design of the machine has been sent to Automated Resources, Inc. for review. Experiments were conducted on threshold binder (orimulsion) concentration. It showed that for binder concentrations below 1%, the initial weight loss of coal logs (due to chipping of corner) is unaffected by the binder concentration unless the binder concentration is 1% or more. For binder levels above 0.25%, more binder causes less coal log wear after long time or or large number of cycles of circulation through pipe. After 250 cycles in the pipe, binderless coal logs suffer approximately twice the wear of the logs with 1% binder.

Liu, H.

1995-12-31T23:59:59.000Z

369

Variation in physical rock properties determined from sonic logs at a South Texas lignite mine  

E-Print Network [OSTI]

graph1c units and their sonic properties; 6. comparing the sonic logg1ng data with geotechnical test results; 7. applying the tool through the production of physical rock character1zati on maps using the sonic and strat1graphic logs of overburden...graph1c units and their sonic properties; 6. comparing the sonic logg1ng data with geotechnical test results; 7. applying the tool through the production of physical rock character1zati on maps using the sonic and strat1graphic logs of overburden...

Cato, Kerry Don

2012-06-07T23:59:59.000Z

370

A UNIX security log analyzer based on from/to access matrix  

E-Print Network [OSTI]

A UNIX SECURITY LOG ANALYZER BASED ON FROM/TO ACCESS MATRIX A Thesis by S A M E R A H M A D E L - H A J M A H M O U D Submitted to the Office of Graduate Studies of Texas A & M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 2002 Major Subject: Computer Engineering A UNIX SECURITY LOG ANALYZER BASED ON FROM/TO ACCESS MATRIX A Thesis by S A M E R A H M A D E L - H A J M A H M O U D Submitted to the Office of Graduate Studies...

El-Haj Mahmoud, Samer Ahmad

2012-06-07T23:59:59.000Z

371

Overview of the gamma reaction history diagnostic for the national ignition facility (NIF)  

SciTech Connect (OSTI)

The National Ignition Facility (NIF) has a need for measuring gamma radiation as part of a nuclear diagnostic program. A new gamma-detection diagnostic uses 900 off-axis parabolic mirrors to rel ay Cherenkov light from a volume of pressurized gas. This non imaging optical system has the high-speed detector placed at a stop position with the Cherenkov light delayed until after the prompt gammas have passed through the detector. Because of the wavelength range (250 to 700 nm), the optical element surface finish was a key design constraint. A cluster of four channels (each set to a different gas pressure) will collect the time histories for different energy ranges of gammas.

Kim, Yong Ho [Los Alamos National Laboratory; Evans, Scott C [Los Alamos National Laboratory; Herrmann, Hans W [Los Alamos National Laboratory; Mack, Joseph M [Los Alamos National Laboratory; Young, Carl S [Los Alamos National Laboratory; Malone, Robert M [Los Alamos National Laboratory; Cox, Brian C [Los Alamos National Laboratory; Frogget, Brent C [Los Alamos National Laboratory; Kaufman, Morris I [Los Alamos National Laboratory; Tunnell, Thomas W [Los Alamos National Laboratory; Tibbitts, Aric [Los Alamos National Laboratory; Palagi, Martin J [NST/LAS VEGAS; Stoeffl, Wolfgang [LLNL

2010-01-01T23:59:59.000Z

372

The Diverse Environments of Gamma-Ray Bursts  

E-Print Network [OSTI]

Galaxies of Dark Gamma-Ray Bursts: Observational Constraintsof a Very Bright Gamma- Ray Burst in a Galactic Halo 3.11.3 Gamma-Ray Burst Classi?cation . . . . . . 1.4 Gamma-Ray

Perley, Daniel Alan

2011-01-01T23:59:59.000Z

373

Pulsed Gamma-Ray-Burst Afterglows  

E-Print Network [OSTI]

provides a candidate for the central engine of the gamma-ray burst (GRB) mechanism, both long and short

J. Middleditch

2009-01-01T23:59:59.000Z

374

Light Curves of Swift Gamma Ray Bursts  

E-Print Network [OSTI]

Recent observations from the Swift gamma-ray burst mission indicate that a fraction of gamma ray bursts are characterized by a canonical behaviour of the X-ray afterglows. We present an effective theory which allows us to account for X-ray light curves of both (short - long) gamma ray bursts and X-ray rich flashes. We propose that gamma ray bursts originate from massive magnetic powered pulsars.

Paolo Cea

2006-09-22T23:59:59.000Z

375

Coal log pipeline research at the University of Missouri. 4th Quarterly report, October 1, 1993--December 31, 1993  

SciTech Connect (OSTI)

This paper is a progress report on a research project aimed at the development of coal log technology. Efforts have been directed at the development of technology for the fabrication of stable coal logs, as well as the energy efficient transport of these logs, in particular by pipelines. Work has been directed at new types of binders, new fabrication presses, the application of polymers to reduce transport losses, and modeling efforts.

Liu, H.

1994-05-01T23:59:59.000Z

376

Periodicities in gamma ray bursts  

Science Journals Connector (OSTI)

Gamma ray burst models based on magnetic neutron stars face a problem of account for the scarcity of observed periods. Both this scarcity and the typical period found when any is detected are explained if the neutron stars are accreting in binary systems

Kent S. Wood

1984-01-01T23:59:59.000Z

377

Gamma-ray events thunderclouds  

E-Print Network [OSTI]

stage of rocket-triggered lightning #12;The gamma-ray flash occurred at the same time the upward leader radiation is also produced by natural lightning during the stepped leader phase. · Dwyer et al. 2003, 2004 found that x-rays are also produced by triggered lightning dart leaders. · At present, the only viable

California at Berkeley, University of

378

The Universe Viewed in Gamma-Rays 1 Properties of Gamma-ray Bursts Localized by  

E-Print Network [OSTI]

The Universe Viewed in Gamma-Rays 1 Properties of Gamma-ray Bursts Localized by the HETE-2 and localize Gamma-ray bursts (GRBs) in wide field of view. HETE-2 have been localized about 20 GRBs per year hours after the burst. 1. The High Energy Transient Explorer 2 Gamma-ray burst (GRB) is the most

Enomoto, Ryoji

379

Very high-energy gamma rays from gamma-ray bursts  

Science Journals Connector (OSTI)

...research-article Discussion Meeting Issue Gamma-ray bursts organized by Alan Wells, Ralph...high-energy gamma rays from gamma-ray bursts Paula M Chadwick * * ( p.m...progress makes the detection of a gamma-ray burst at the highest energies much...

2007-01-01T23:59:59.000Z

380

A proof of the Gamma test  

Science Journals Connector (OSTI)

...research-article Research Article A proof of the Gamma test Dafydd Evans Antonia J. Jones Department...dataset of input-output vectors, the Gamma test estimates the variance of the noise on...derivatives. We present a proof of the Gamma test under fairly weak hypotheses. nonlinear...

2002-01-01T23:59:59.000Z

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


381

Gamma-ray burst theory after Swift  

Science Journals Connector (OSTI)

...research-article Discussion Meeting Issue Gamma-ray bursts organized by Alan Wells, Ralph...J. Wijers and Martin Rees Gamma-ray burst theory after Swift Tsvi Piran...relativistic blast wave model for gamma-ray bursts (GRBs). Together with the...

2007-01-01T23:59:59.000Z

382

Gamma-ray bursts and cosmology  

Science Journals Connector (OSTI)

...research-article Discussion Meeting Issue Gamma-ray bursts organized by Alan Wells, Ralph...J. Wijers and Martin Rees Gamma-ray bursts and cosmology D.Q Lamb...current status of the use of gamma-ray bursts (GRBs) as probes of the early...

2007-01-01T23:59:59.000Z

383

Non-destructive assay of mechanical components using gamma-rays and thermal neutrons  

SciTech Connect (OSTI)

This work presents the results obtained in the inspection of several mechanical components through neutron and gamma-ray transmission radiography. The 4.46 Multiplication-Sign 10{sup 5} n.cm{sup -2}.s{sup -1} thermal neutron flux available at the main port of the Argonauta research reactor in Instituto de Engenharia Nuclear has been used as source for the neutron radiographic imaging. The 412 keV {gamma}-ray emitted by {sup 198}Au, also produced in that reactor, has been used as interrogation agent for the gamma radiography. Imaging Plates - IP specifically designed to operate with thermal neutrons or with X-rays have been employed as detectors and storage devices for each of these radiations.

Souza, Erica Silvani; Avelino, Mila R. [PPG-EM/UERJ, R. Sao Francisco Xavier, 524, Maracana - Rio de Janeiro - RJ (Brazil); Almeida, Gevaldo L. de; Souza, Maria Ines S. [IEN/CNEN, Rua Helio de Almeida, 75, Ilha do Fundao, Rio de Janeiro - RJ (Brazil)

2013-05-06T23:59:59.000Z

384

Neutron/gamma coupled library generation and gamma transport calculation with KARMA 1.2  

SciTech Connect (OSTI)

KAERI has developed a lattice transport calculation code KARMA and its multi-group cross section library generation system. Recently, the multi-group cross section library generation system has included a gamma cross section generation capability and KARMA also has been improved to include a gamma transport calculation module. This paper addresses the multi-group gamma cross section generation capability for the KARMA 1.2 code and the preliminary test results of the KARMA 1.2 gamma transport calculations. The gamma transport calculation with KARMA 1.2 gives the gamma flux, gamma smeared power, and gamma energy deposition distributions. The results of the KARMA gamma calculations were compared with those of HELIOS and they showed that KARMA 1.2 gives reasonable gamma transport calculation results. (authors)

Hong, S. G. [Dept. of Nuclear Engineering, Kyung Hee Univ., 446-701 Deogyeong-daero, GiHeung-gu, Yongin, Gyeonggi-do (Korea, Republic of); Kim, K. S.; Cho, J. Y.; Lee, K. H. [Korea Atomic Energy Research Inst., 305-353 Duckjin-dong, Yuseong-gu, Daejon (Korea, Republic of)

2012-07-01T23:59:59.000Z

385

The neutron-gamma Feynman variance to mean approach: gamma detection and total neutron-gamma detection (theory and practice)  

E-Print Network [OSTI]

Two versions of the neutron-gamma variance to mean (Feynman-alpha method or Feynman-Y function) formula for either gamma detection only or total neutron-gamma detection, respectively, are derived and compared in this paper. The new formulas have a particular importance for detectors of either gamma photons or detectors sensitive to both neutron and gamma radiation. If applied to a plastic or liquid scintillation detector, the total neutron-gamma detection Feynman-Y expression corresponds to a situation where no discrimination is made between neutrons and gamma particles. The gamma variance to mean formulas are useful when a detector of only gamma radiation is used or when working with a combined neutron-gamma detector at high count rates. The theoretical derivation is based on the Chapman-Kolmogorov equation with inclusion of general reactions and passage intensities for neutrons and gammas, but with the inclusion of prompt reactions only. A one energy group approximation is considered. The comparison of the ...

Chernikova, Dina; Avdic, Senada; Pzsit, Imre; Nordlund, Anders

2014-01-01T23:59:59.000Z

386

ProxiScan?: A Novel Camera for Imaging Prostate Cancer  

ScienceCinema (OSTI)

ProxiScan is a compact gamma camera suited for high-resolution imaging of prostate cancer. Developed by Brookhaven National Laboratory and Hybridyne Imaging Technologies, Inc., ProxiScan won a 2009 R&D 100 Award, sponsored by R&D Magazine to recognize t

Ralph James

2010-01-08T23:59:59.000Z

387

Property:Building/SPPurchasedEngyNrmlYrMwhYrLogs | Open Energy Information  

Open Energy Info (EERE)

SPPurchasedEngyNrmlYrMwhYrLogs SPPurchasedEngyNrmlYrMwhYrLogs Jump to: navigation, search This is a property of type String. Logs Pages using the property "Building/SPPurchasedEngyNrmlYrMwhYrLogs" Showing 25 pages using this property. (previous 25) (next 25) S Sweden Building 05K0001 + 0.0 + Sweden Building 05K0002 + 0.0 + Sweden Building 05K0003 + 0.0 + Sweden Building 05K0004 + 0.0 + Sweden Building 05K0005 + 0.0 + Sweden Building 05K0006 + 0.0 + Sweden Building 05K0007 + 0.0 + Sweden Building 05K0008 + 0.0 + Sweden Building 05K0009 + 0.0 + Sweden Building 05K0010 + 0.0 + Sweden Building 05K0011 + 0.0 + Sweden Building 05K0012 + 0.0 + Sweden Building 05K0013 + 0.0 + Sweden Building 05K0014 + 0.0 + Sweden Building 05K0015 + 0.0 + Sweden Building 05K0016 + 0.0 + Sweden Building 05K0017 + 0.0 +

388

Property:Building/SPPurchasedEngyForPeriodMwhYrLogs | Open Energy  

Open Energy Info (EERE)

SPPurchasedEngyForPeriodMwhYrLogs SPPurchasedEngyForPeriodMwhYrLogs Jump to: navigation, search This is a property of type String. Logs Pages using the property "Building/SPPurchasedEngyForPeriodMwhYrLogs" Showing 25 pages using this property. (previous 25) (next 25) S Sweden Building 05K0001 + 0.0 + Sweden Building 05K0002 + 0.0 + Sweden Building 05K0003 + 0.0 + Sweden Building 05K0004 + 0.0 + Sweden Building 05K0005 + 0.0 + Sweden Building 05K0006 + 0.0 + Sweden Building 05K0007 + 0.0 + Sweden Building 05K0008 + 0.0 + Sweden Building 05K0009 + 0.0 + Sweden Building 05K0010 + 0.0 + Sweden Building 05K0011 + 0.0 + Sweden Building 05K0012 + 0.0 + Sweden Building 05K0013 + 0.0 + Sweden Building 05K0014 + 0.0 + Sweden Building 05K0015 + 0.0 + Sweden Building 05K0016 + 0.0 +

389

Property:Building/SPPurchasedEngyPerAreaKwhM2Logs | Open Energy Information  

Open Energy Info (EERE)

Logs Logs Jump to: navigation, search This is a property of type String. Logs Pages using the property "Building/SPPurchasedEngyPerAreaKwhM2Logs" Showing 25 pages using this property. (previous 25) (next 25) S Sweden Building 05K0001 + 0.0 + Sweden Building 05K0002 + 0.0 + Sweden Building 05K0003 + 0.0 + Sweden Building 05K0004 + 0.0 + Sweden Building 05K0005 + 0.0 + Sweden Building 05K0006 + 0.0 + Sweden Building 05K0007 + 0.0 + Sweden Building 05K0008 + 0.0 + Sweden Building 05K0009 + 0.0 + Sweden Building 05K0010 + 0.0 + Sweden Building 05K0011 + 0.0 + Sweden Building 05K0012 + 0.0 + Sweden Building 05K0013 + 0.0 + Sweden Building 05K0014 + 0.0 + Sweden Building 05K0015 + 0.0 + Sweden Building 05K0016 + 0.0 + Sweden Building 05K0017 + 0.0 +

390

Borehole Logging Methods for Exploration and Evaluation of Uranium Deposits (1967)  

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

Borehole logging methods for exploration Borehole logging methods for exploration and evaluation o f uranium deposits . Philip H. O d d , Robert F. Bmullad and Carl P. Lathan rej~rinkttl fnlm Mining and Groundwater Geophysiall967 Borehole logging methods for exploration and evaluation of uranium deposits Philip H. Dodd, Robert F. Droullard and Carl P. Lathan US. Atomic Energy Commhwn GmrPd Jtinct&n, Colorado Abstract, M o l e 1 - i s thc geophysical methad mast exten&@ w r t i n the Udtrrd States for exploratio~ md edwtim of wanhi &pod&. dammow lop, C o r n r n d j suppkrnentd with a singbz-pobt msfstailee log, m t l y supply about 80 percent of the bask data for om regerve c W t i o R a d mu& of the w ~ k r 6 . p ~ &ngk inf~nnatio~ Tmck-mounted 'rotmy eqnipmcnt i s EMhmody emphy&& holes usually hwre a nominai b

391

Cost-effective conservation: calculating biodiversity and logging trade-offs in Southeast Asia  

E-Print Network [OSTI]

LETTER Cost-effective conservation: calculating biodiversity and logging trade-offs in Southeast and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA Keywords Biodiversity conservation; birds-off between economic interests and biodiversity conservation. Here, we provide an empirical examination

Vermont, University of

392

Quantitative interpretation of pulsed neutron capture logs: Part 1 --Fast numerical simulation  

E-Print Network [OSTI]

Jordan G. Mimoun1 , Carlos Torres-Verdi´n2 , and William E. Preeg3 ABSTRACT Pulsed neutron capture (PNC for shoulder-bed effects on R logs acquired in sand- shale laminated reservoirs. Because of diffusion effects responses of pure-sand and pure- shale end members of the sedimentary sequence. We have developed a new

Torres-Verdín, Carlos

393

Learn from Web Search Logs to Organize Search Results Xuanhui Wang  

E-Print Network [OSTI]

and Subject Descriptors: H.3.3 [Informa- tion Search and Retrieval]: Clustering, Search process General TermsLearn from Web Search Logs to Organize Search Results Xuanhui Wang Department of Computer Science Effective organization of search results is critical for improv- ing the utility of any search engine

Zhai, ChengXiang

394

Improving The Referrer-Based Web Log Session Reconstruction Mehran Nadjarbashi-Noghani  

E-Print Network [OSTI]

Improving The Referrer-Based Web Log Session Reconstruction Mehran Nadjarbashi-Noghani Faculty. We extend the conventional referrer-based heuristic to exploit this adaptation in order to achieve with some noisy or incomplete information such as the null referrer. Session reconstruction is the process

Ghorbani, Ali

395

Web user profiling on proxy logs and its evaluation in personalization  

Science Journals Connector (OSTI)

We propose a web user profiling and clustering framework based on LDA-based topic modeling with an analogy to document analysis in which documents and words represent users and their actions. The main technical challenge addressed here is how to symbolize ... Keywords: latent dirichlet allocation, proxy logs based analysis, topic modeling, web user clustering

Hiroshi Fujimoto; Minoru Etoh; Akira Kinno; Yoshikazu Akinaga

2011-04-01T23:59:59.000Z

396

Topic analysis of web user behavior using LDA model on proxy logs  

Science Journals Connector (OSTI)

We propose a web user profiling and clustering framework based on LDA-based topic modeling with an analogy to document analysis in which documents and words represent users and their actions. The main technical challenge addressed here is how to symbolize ... Keywords: latent dirichlet allocation, proxy logs based analysis, topic modeling, web user clustering

Hiroshi Fujimoto; Minoru Etoh; Akira Kinno; Yoshikazu Akinaga

2011-05-01T23:59:59.000Z

397

ForPeerReview Interpretation of hydraulic rock types with resistivity logs in  

E-Print Network [OSTI]

Tertiary turbidite oil reservoirs in the Gulf of Mexico, verify that inclusion of resistivity logs turbidite reservoirs: pore-scale modeling verified with field observations in the Gulf of Mexico, U and Geosystems Engineering Keywords: electrical/resistivity, permeability, modeling, deepwater, Gulf of Mexico

Torres-Verdín, Carlos

398

2012 International Conference on Lightning Protection (ICLP), Vienna, Austria Lightning Observatory in Gainesville (LOG), Florida  

E-Print Network [OSTI]

) and 1(b), respectively. The LOG was originally designed to respond to both natural lightning flashes2012 International Conference on Lightning Protection (ICLP), Vienna, Austria Lightning Observatory, Inc., Tucson, Arizona, USA E-mail: (rakov@ece.ufl.edu) Abstract--The Lightning Observatory

Florida, University of

399

Annual Logging Symposium, June 3-6, 2007 RAPID SIMULATION OF BOREHOLE NUCLEAR MEASUREMENTS  

E-Print Network [OSTI]

MEASUREMENTS WITH APPROXIMATE SPATIAL FLUX-SCATTERING FUNCTIONS A. Mendoza, and C. Torres and benchmark fast approximate numerical procedures to simulate neutron and density porosity logs making use of Monte Carlo-derived spatial flux- scattering functions (FSFs) for specific nuclear tool configurations

Torres-Verdín, Carlos

400

Deep borehole log evidence for fractal distribution of fractures in crystalline rock  

Science Journals Connector (OSTI)

......as well as large scale-lengths...fractures seen in drilling cores and...register on a borehole scanning...rock in the borehole wall. In...evidence in the drilling logs or retrieved...core that large-scale fractures...samples, and drilling history...control the large-scale trend...sensitive to borehole lithology......

Peter Leary

1991-12-01T23:59:59.000Z

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


401

Weekly Security Incident Log Period of May 27 -Jun 2, 2013  

E-Print Network [OSTI]

/30/2013 02:37 PM Emergency Medical 2013-000958 ROSS BUILDING - NORTH TOWER Subject not Identified SecurityWeekly Security Incident Log Period of May 27 - Jun 2, 2013 Incident No. Reported Date Building and a Facilities Electrician responded to a report that a lamp standard on the north side of the William Small

402

Weekly Security Incident Log Period of Jun 2 -Jun 8, 2014  

E-Print Network [OSTI]

. A description of a suspect was obtained. 6/4/2014 06:39 PM Theft, Under 2014-000979 ROSS BUILDING - NORTH TOWERWeekly Security Incident Log Period of Jun 2 - Jun 8, 2014 Incident No. Reported Date Building Name lot. No injuries were reported. 6/2/2014 06:19 PM Motor Vehicle Incident 2014-000960 TECHNOLOGY

403

Integrated Visualization Schemes for an Information and Communication Web Log Based Management System  

Science Journals Connector (OSTI)

This paper presents a set of visualization methods incorporated in a system for internal technologically mediated communication and information management. This system, which assumes an organizational context and an intranet built on World Wide Web technologies ... Keywords: information visualization, information and communication management, web logs

Oscar Mealha; Beatriz Sousa Santos; Jose Nunes; Florin Zamfir

2004-07-01T23:59:59.000Z

404

Adaptation of the Concept Hierarchy Model with Search Logs for Query Recommendation on Intranets  

E-Print Network [OSTI]

Adaptation of the Concept Hierarchy Model with Search Logs for Query Recommendation on Intranets for query recommendation on Intranets by ranking terms according to the strength of their links to the query for identical queries and rebuilding it from scratch periodically can be extremely inefficient due to the high

Kruschwitz, Udo

405

A Legacy of Low-Impact Logging does not Elevate Prevalence of Potentially Pathogenic Protozoa  

E-Print Network [OSTI]

in Free-Ranging Gorillas and Chimpanzees in the Republic of Congo: Logging and Parasitism in African Apes Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, IL 4 Congo Program, Wildlife Conservation Society, Brazzaville, Republic of Congo 5 Department of Pathobiology, College of Veterinary

406

Stream temperature responses to clearcut logging in British Columbia: the moderating influences of  

E-Print Network [OSTI]

Stream temperature responses to clearcut logging in British Columbia: the moderating influences the temperature responses of small, lake- headed streams to streamside timber harvesting. We examined the temperature patterns of two subboreal outlet streams in north-central British Columbia for 1 year before and 3

Hinch, Scott G.

407

Effects of experimental clearcut logging on thermal stratification, dissolved oxygen, and lake  

E-Print Network [OSTI]

à blanc autour de trois lacs dimictiques de 30 à 40 ha du nord-ouest de l'Ontario a été associée à caused sedimentation and nutrient enrichment in streams in various parts of North America (e.g., Brown water quality changes af- ter logging around boreal lakes and streams (Holopainen et al. 1991; Rask et

Wisenden, Brian D.

408

OpLog: a library for scaling update-heavy data structures  

E-Print Network [OSTI]

Existing techniques (e.g., RCU) can achieve good multi-core scaling for read-mostly data, but for update-heavy data structures only special-purpose techniques exist. This paper presents OpLog, a general-purpose library ...

Boyd-Wickizer, Silas

2014-09-16T23:59:59.000Z

409

Capacitive conductivity logging and electrical stratigraphy in a high-resistivity aquifer, Boise Hydrogeophysical Research Site  

E-Print Network [OSTI]

Capacitive conductivity logging and electrical stratigraphy in a high-resistivity aquifer, Boise . Examining such a high-resistivity system provides a good test for the ca- pacitive-conductivity tool because the conventional induc- tion-conductivity tool known to have limited effectiveness in high-resistivity systems did

Barrash, Warren

410

Seneca Creek Associates, LLC Wood Resources International, LLC "Illegal" Logging and Global Wood Markets  

E-Print Network [OSTI]

Seneca Creek Associates, LLC Wood Resources International, LLC SUMMARY "Illegal" Logging and Global Wood Markets: The Competitive Impacts on the U.S. Wood Products Industry Prepared for: American Forest Phone: 1-202-463-2713 Fax: 1-202- 463-4703 E-mail: agoetzl@sencreek.com Wood Resources International

411

Speech enhancement by joint statistical characterization in the Log Gabor Wavelet domain  

Science Journals Connector (OSTI)

In speech enhancement, Bayesian Marginal models cannot explain the inter-scale statistical dependencies of different wavelet scales. Simple non-linear estimators for wavelet-based denoising assume that the wavelet coefficients in different scales are ... Keywords: Bayesian bivariate estimator, Circularly Symmetric Probability Density Function, Log Gabor Wavelet, Speech enhancement, Speech recognition, Spherically Invariant Random Processes

Suman Senapati; Sandipan Chakroborty; Goutam Saha

2008-06-01T23:59:59.000Z

412

Sandia National Laboratories: Research: Facilities: Gamma Irradiation  

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

Gamma Irradiation Facility Gamma Irradiation Facility Photo of Gamma Irradiation Facility The Gamma Irradiation Facility (GIF) provides high-fidelity simulation of nuclear radiation environments for materials and component testing. The low-dose irradiation facility also offers an environment for long-duration testing of materials and electronic components. Such testing may take place over a number of months or even years. Research and other activities The single-structure GIF can house a wide variety of gamma irradiation experiments with various test configurations and at different dose and dose rate levels. Radiation fields at the GIF are produced by high-intensity gamma-ray sources. To induce ionizing radiation effects and damage in test objects, the objects are subjected to high-energy photons from gamma-source

413

Salvage logging and forest renewal affect early aspen stand structure after catastrophic wind  

Science Journals Connector (OSTI)

Abstract Among the major natural disturbances that occur in the North American boreal forest, the effects of catastrophic wind are the least studied due to its infrequent occurrence, often in inaccessible areas, and lack of rapid research response. Most documented studies have been conducted in conifer or mixedwood forests and generally have not considered follow up forest renewal operations such as salvage logging followed by planting and tending. In 2006 after a severe wind disturbance in trembling aspen (Populus tremuloides Michx.) forest in northeastern Ontario, we established an operational study to investigate the effects of post-wind disturbance treatments on stand structure (residual live trees, snags, and downed wood) and early forest regeneration. The treatments were blowdown (B), blowdown followed by salvage logging (BS), blowdown followed by salvage logging, windrowing and planting (BSP), BSP followed by aerial spray (tending) with glyphosate 1year after planting (BSPT), and clearcut (C). The operational salvage logging removed about 55% of the 60 m3 ha?1 of the snags and 15% of the 390 m3 ha?1 of the coarse downed wood. The relatively low rate of salvage removal increased the abundance (density and stocking) of aspen regeneration and reduced moss cover, but did not affect average height of aspen suckers or the abundance (cover) of other vegetation types. The mechanical operations damaged much of the advanced growth of conifers (mostly black spruce and balsam fir (Abies balsamea (L.) Mill.) released by the wind. However, these stems were not sufficiently abundant to contribute significantly to the regenerating forest. Windrowing before planting slightly reduced the amount of area covered by downed wood, while the tending reduced broadleaf regeneration and the abundance of shrubs and increased conifer regeneration and the abundance of grasses. If the management objective is to renew aspen forests lost to catastrophic wind, salvage logging is a viable option to clear the site for regeneration. Forest renewal treatments, including planting and tending, are required when the management objective is conifer regeneration.

Rongzhou Man; Han Y.H. Chen; Andrew Schafer

2013-01-01T23:59:59.000Z

414

Gamma radiolysis of chlorinated hydrocarbons  

SciTech Connect (OSTI)

This program is the Idaho National Engineering Laboratory (INEL) component of a joint collarborative effort with Lawrence Livermore National Laboratory (LLNL). The purpose of this effort is to demonstrate a viable process for breaking down hazardous halogenated organic wastes to simpler, non-hazardous waste using high energy ionizing radiation. The INEL effort focuses on the use of spent reactor fuel gamma radiation sources to decompose complex wastes such as PCBs. At LLNL, halogenated solvents such as carbon tetrachloride and trichloroethylene are being studied using accelerator radiation sources. The INEL irradiation experiments concentrated on a single PCB congener so that a limited set of decomposition reactions could be studied. The congener 2,2{prime}, 3,3{prime},4,5{prime},6,6{prime} - octachlorobiphenyl was examined following exposure to various gamma doses at the Advanced Test Reactor (AIR) spent fuel pool. The decomposition rates and products in several solvents are discussed. 3 refs.

Arbon, R.E.; Mincher, B.J.; Meikrantz, D.H.

1992-01-01T23:59:59.000Z

415

Gamma radiolysis of chlorinated hydrocarbons  

SciTech Connect (OSTI)

This program is the Idaho National Engineering Laboratory (INEL) component of a joint collarborative effort with Lawrence Livermore National Laboratory (LLNL). The purpose of this effort is to demonstrate a viable process for breaking down hazardous halogenated organic wastes to simpler, non-hazardous waste using high energy ionizing radiation. The INEL effort focuses on the use of spent reactor fuel gamma radiation sources to decompose complex wastes such as PCBs. At LLNL, halogenated solvents such as carbon tetrachloride and trichloroethylene are being studied using accelerator radiation sources. The INEL irradiation experiments concentrated on a single PCB congener so that a limited set of decomposition reactions could be studied. The congener 2,2{prime}, 3,3{prime},4,5{prime},6,6{prime} - octachlorobiphenyl was examined following exposure to various gamma doses at the Advanced Test Reactor (AIR) spent fuel pool. The decomposition rates and products in several solvents are discussed. 3 refs.

Arbon, R.E.; Mincher, B.J.; Meikrantz, D.H.

1992-08-01T23:59:59.000Z

416

Gamma Industry Processing Alliance Overview  

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

NATIONAL NATIONAL STAKEHOLDERS TRANSPORTATION FORUM WHO IS GIPA? * Alliance made up of 15 companies from the Medical Device Manufacturers, Cobalt source , manufacturers and one industrial processing company Represents all the major gamma processing * Represents all the major gamma processing facilities within the US to the regulatory bodies such as the USNRC. * Member of International Irradiation Association (iiA) WHO IS GIPA? An alliance created to advocate the development of An alliance created to advocate the development of responsible regulations that enhance the safe and secure management of Cobalt-60 sources and related irradiation processing facilities related irradiation processing facilities. APRIL 15, 2010 PRESENTATION TITLE WORLD SUPPLIERS OF COBALT 60 COBALT 60 * Nordion Inc

417

Are gamma ray bursts nearby?  

Science Journals Connector (OSTI)

The possibility is considered that the intrinsic luminosity function of gamma ray bursters has sufficient scatter that the ln?N?ln?S relation of observed bursts not be dominated by geometric effects favoring large volumes but rather be dominated by nearby intrinsically faint bursts. It is shown that the distribution of bursts on the sky would be very granular with a significant fraction of them coming from the two or three nearest sources. Possible solutions and alternatives are briefly discussed.

David Eichler

1994-01-01T23:59:59.000Z

418

Gamma-ray burst afterglows  

E-Print Network [OSTI]

Extended, fading emissions in multi-wavelength are observed following Gamma-ray bursts (GRBs). Recent broad-band observational campaigns led by the Swift Observatory reveal rich features of these GRB afterglows. Here we review the latest observational progress and discuss the theoretical implications for understanding the central engine, composition, and geometric configuration of GRB jets, as well as their interactions with the ambient medium.

Bing Zhang

2006-11-24T23:59:59.000Z

419

Coal log pipeline research at the University of Missouri. 3rd Quarterly report, July 1, 1993--September 30, 1993  

SciTech Connect (OSTI)

This report summarizes a research program on the transport of coal by formation of coal logs, and subsequent transport in pipelines. Separate projects within this program address questions on the formation of the coal logs, flow in pipelines, including slurry pipelines, interaction with water, wear in pipelines, and questions on economics and legal aspects.

Liu, H.

1994-05-01T23:59:59.000Z

420

METALLICITIES, DUST, AND MOLECULAR CONTENT OF A QSO-DAMPED Ly{alpha} SYSTEM REACHING log N(H I) = 22: AN ANALOG TO GRB-DLAs  

SciTech Connect (OSTI)

We present the elemental abundance and H{sub 2} content measurements of a damped Ly{alpha} (DLA) system with an extremely large H I column density, log N(H I) (cm{sup -2}) = 22.0 {+-} 0.10, at z{sub abs} = 3.287 toward the QSO SDSS J081634+144612. We measure column densities of H{sub 2}, C I, C I*, Zn II, Fe II, Cr II, Ni II, and Si II from a high signal-to-noise and high spectral resolution VLT-UVES spectrum. The overall metallicity of the system is [Zn/H] = -1.10 {+-} 0.10 relative to solar. Two molecular hydrogen absorption components are seen at z = 3.28667 and 3.28742 (a velocity separation of Almost-Equal-To 52 km s{sup -1}) in rotational levels up to J = 3. We derive a total H{sub 2} column density of log N(H{sub 2}) (cm{sup -2}) = 18.66 and a mean molecular fraction of f = 2N(H{sub 2})/[2N(H{sub 2}) + N(H I)] = 10{sup -3.04{+-}0.37}, typical of known H{sub 2}-bearing DLA systems. From the observed abundance ratios we conclude that dust is present in the interstellar medium of this galaxy, with an enhanced abundance in the H{sub 2}-bearing clouds. However, the total amount of dust along the line of sight is not large and does not produce any significant reddening of the background QSO. The physical conditions in the H{sub 2}-bearing clouds are constrained directly from the column densities of H{sub 2} in different rotational levels, C I and C I*. The kinetic temperature is found to be T Almost-Equal-To 75 K and the particle density lies in the range n{sub H} = 50-80 cm{sup -3}. The neutral hydrogen column density of this DLA is similar to the mean H I column density of DLAs observed at the redshift of {gamma}-ray bursts (GRBs). We explore the relationship between GRB-DLAs and the high column density end of QSO-DLAs finding that the properties (metallicity and depletion) of DLAs with log N(H I) > 21.5 in the two populations do not appear to be significantly different.

Guimaraes, R. [Programa de Modelagem Computacional-SENAI-Cimatec, 41650-010 Salvador, Bahia (Brazil); Noterdaeme, P.; Petitjean, P. [UPMC-CNRS, UMR7095, Institut d'Astrophysique de Paris, 98bis Blvd. Arago, F-75014 Paris (France); Ledoux, C. [European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19 (Chile); Srianand, R.; Rahmani, H. [Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007 (India); Lopez, S., E-mail: rguimara@eso.org [Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile)

2012-06-15T23:59:59.000Z

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


421

Outage Log  

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

1814 4:45 PST 111814 10:18 PST Project Unavailable. 111214 0:22 PST - Hopper IDLMATLABMathematica unavailable on Hopper. 111214 0:22 PST - Edison IDLMATLABMathematica...

422

Hislop Log  

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

and Occurrence Reporting Land Lines - Dial 9 - 911 Cell Phones - Dial 911 Reporting Emergencies As the Commerce Park Offices are not within the Oak Ridge National Laboratory...

423

Gamma-ray observations of the Crab Region using a coded-aperture telescope  

SciTech Connect (OSTI)

The region of the Galactic anticenter, including the Crab Nebula, was observed during a balloon flight of the University of New Hampshire Directional Gamma-Ray Telescope employing the coded-aperture imaging technique to image celestial gamma-radiation between 160 keV and 9.3 MeV. The background systematics are treated with a simple and relatively straightforward correction procedure. The results demonstrate that the coded-aperture procedure is a viable approach for imaging not only point sources of radiation, but also extended sources of emission. The results for the Crab's photon spectrum are consistent with a power-law spectrum. Upper limits on the flux levels of line emission at 405 keV and 1050 keV and on the flux from the X-ray binary source A0535 + 26 and diffuse Galactic emission from the anticenter region are derived. 35 references.

Mcconnell, M.L.; Dunphy, P.P.; Forrest, D.J.; Chupp, E.L.; Owens, A.

1987-10-01T23:59:59.000Z

424

Soft gamma-ray galactic ridge emission as unveiled by SPI aboard INTEGRAL  

SciTech Connect (OSTI)

The origin of the soft gamma-ray (200 keV - 1 MeV) galactic ridge emission is one of the long-standing mysteries in the field of high-energy astrophysics. Population studies at lower energies have shown that emission from accreting compact objects gradually recedes in this domain, leaving place to another source of gamma-ray emission that is characterised by a hard power-law spectrum extending from 100 keV up to 100 MeV The nature of this hard component has remained so far elusive, partly due to the lack of sufficiently sensitive imaging telescopes that would be able to unveil the spatial distribution of the emission. The SPI telescope aboard INTEGRAL allows now for the first time the simultaneous imaging of diffuse and point-like emission in the soft gamma-ray regime. We present here all-sky images of the soft gamma-ray continuum emission that clearly reveal the morphology of the different emission components. We discuss the implications of our results on the nature of underlying emission processes and we put our results in perspective of GLAST studies of diffuse galactic continuum emission.

Knoedlseder, J.; Weidenspointner, G.; Jean, P. [CESR - UPS/CNRS, 9, avenue du Colonel Roche, BP 44346, 31028 Toulouse Cedex 5 (France); Lonjou, V. [CENBG, Universite Bordeaux 1 (CNRS/IN2P3), Chemin du Solarium, BP 120, 33175 Gradignan (France); Strong, A.; Diehl, R. [Max-Planck-Institut fuer Extraterrestrische Physik, Postfach 1603, 85740 Garching (Germany); Cordier, B.; Schanne, S. [CEA Saclay, DSM/DAPNIA/Service d'Astrophysique, 91191 Gif-sur-Yvette (France); Winkler, C. [ESA/ESTEC, Science Operations and Data Systems Division (SCI-SD), 2201 AZ Noordwijk (Netherlands)

2007-07-12T23:59:59.000Z

425

People Images  

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

Images People Images Several hundred of the 1700 U.S. scientists contributing to the LHC accelerator and experiments gathered in June 2008 in CERN's building 40 CE0252 Joel...

426

Pulsed pyroelectric crystal-powered gamma source  

SciTech Connect (OSTI)

A compact pulsed gamma generator is being developed to replace radiological sources used in commercial, industrial and medical applications. Mono-energetic gammas are produced in the 0.4 - 1.0 MeV energy range using nuclear reactions such as {sup 9}Be(d,n{gamma}){sup 10}B. The gamma generator employs an RF-driven inductively coupled plasma ion source to produce deuterium ion current densities up to 2 mA/mm{sup 2} and ampere-level current pulses can be attained by utilizing an array extraction grid. The extracted deuterium ions are accelerated to approximately 300 keV via a compact stacked pyroelectric crystal system and then bombard the beryllium target to generate gammas. The resulting microsecond pulse of gammas is equivalent to a radiological source with curie-level activity.

Chen, A. X.; Antolak, A. J.; Leung, K.-N.; Raber, T. N.; Morse, D. H. [Sandia National Laboratories, Livermore, CA 94550 (United States)

2013-04-19T23:59:59.000Z

427

Pressure Temperature Log At Steamboat Springs Area (Combs, Et Al., 1999) |  

Open Energy Info (EERE)

Steamboat Springs Area (Combs, Et Al., 1999) Steamboat Springs Area (Combs, Et Al., 1999) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Steamboat Springs Area (Combs, Et Al., 1999) Exploration Activity Details Location Steamboat Springs Area Exploration Technique Pressure Temperature Log Activity Date Usefulness could be useful with more improvements DOE-funding Unknown Notes Downhole data during production and injection tests were acquired using pressure/temperature/spinner (PTS) tools from two dtierent service companies. Although details differed, all the commercial downhole instruments were designed to take data and to transmit that data uphole in real time, using a singleconductor wireline. All the instruments (each company used more than one) employed a dewar, or thermal flasIq to protect

428

Resistivity Log At The Needles Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Resistivity Log At The Needles Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Single-Well and Cross-Well Resistivity At The Needles Area (DOE GTP) Exploration Activity Details Location The Needles Area Exploration Technique Single-Well and Cross-Well Resistivity Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Resistivity_Log_At_The_Needles_Area_(DOE_GTP)&oldid=689880" Categories: Exploration Activities

429

Resistivity Log At Fort Bliss Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Resistivity Log At Fort Bliss Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Single-Well and Cross-Well Resistivity At Fort Bliss Area (DOE GTP) Exploration Activity Details Location Fort Bliss Area Exploration Technique Single-Well and Cross-Well Resistivity Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Resistivity_Log_At_Fort_Bliss_Area_(DOE_GTP)&oldid=689878" Categories: Exploration Activities

430

Resistivity Log At Fish Lake Valley Area (DOE GTP) | Open Energy  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Resistivity Log At Fish Lake Valley Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Single-Well and Cross-Well Resistivity At Fish Lake Valley Area (DOE GTP) Exploration Activity Details Location Fish Lake Valley Area Exploration Technique Single-Well and Cross-Well Resistivity Activity Date Usefulness not indicated DOE-funding Unknown References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Resistivity_Log_At_Fish_Lake_Valley_Area_(DOE_GTP)&oldid=689876" Categories:

431

Quantification of Wellbore Leakage Risk Using Non?destructive Borehole Logging Techniques  

SciTech Connect (OSTI)

Well integrity is important at all potential CCS locations and may play a crucial role establishing leakage risk in areas where there is a high density of existing wells that could be impacted by the storage operations including depleted petroleum fields where EOR or CCS will occur. To address a need for risk quantification methods that can be directly applied to individual wells using borehole logging tools a study was conducted using data from five wells in Wyoming. The objectives of the study were: Objective 1 Develop methods to establish the baseline flow parameters (porosity and permeability or mobility) from individual measurements of the material properties and defects in a well. Objective 2 Develop a correlation between field flow?property data and cement logs that can be used to establish the flow?properties of well materials and well features using cement mapping tools. Objective 3 Establish a method that uses the flow?property model (Objective 2) to analyze the statistical uncertainties associated with individual well leakage that can provide basis for uncertainty in risk calculations. The project objectives were met through the logging of five wells in Carbon and Natrona County Wyoming to collect data that was used to estimate individual and average well flow properties and model the results using ultrasonic data collected during the logging. Three of the five wells provided data on point and average flow properties for well annuli. Data from the other two wells were used to create models of cement permeability and test whether information collected in one well could be used to characterize another well. The results of the in?situ point measurements were confirmed by the lab measurements sidewall cores collected near the same depths Objective 1 was met using the data collected through logging, testing, and sampling. The methods were developed that can establish baseline flow parameters of wells by both point and average test methods. The methods to estimate the flow properties modeling of point pressure tests, modeling of vertical interference tests, and laboratory measurement of cased?hole sidewall cores The wells were in sufficiently good shape to allow the development of the characterization methods while still having enough defects to study differences in results as they relate to well integrity. Samples and tests analyzed from three of five wells studied in showed the cements were largely intact and had not degraded from exposure native brines. Log results taken in conjunction with the core measurements indicate that interfaces and/or problems with cement placement due to eccentering provide preferential flow paths for fluids, which can increase the effective permeability of the barrier several orders of magnitude above the permeability of intact cement. The results of the maps created using logging tools indicating that the cement condition and bond are generally good identify a need for more research to understand how logs can be used to predict effective well permeabilities such as those measured by the VITs in this study.

Duguid, Andrew; Butsch, Robert; Cary, J.; Celia, Michael; Chugunov, Nikita; Gasda, Sarah; Hovorka, Susan; Ramakrishnan, T. S.; Stamp, Vicki; Thingelstad, Rebecca; Wang, James

2014-05-31T23:59:59.000Z

432

Improvement of epidemiological data analysis by unbiased estimates of log-normal dose distribution  

Science Journals Connector (OSTI)

The effects of radiation on population and risk assessment are studied through epidemiological studies that are heavily dependent on dose distribution. Radiation doses to individual workers follow a log-normal distribution. Computation of the collective dose with the minimum detectable values (Detection Limit or DL) as zero is biased. Hence the expectation value of the 'missed' doses is computed as the ratio of the collective dose of all dosimeters with DL to the product of the total number of dosimeters. So far, in all epidemiological studies, doses below DL are set equal to the DL itself and yield a positive bias in the dose-response relation. This paper presents an enhanced method by removing the bias with the help of the Expectation Maximisation (EM) algorithm. This algorithm, along with unbiased characteristic estimates of log-normal distribution, significantly improves the estimation of confounders by 95%, and improves the dose-response relationship.

Joyeeta Mukhopadhyaya; D. Datta; H.S. Kushwaha

2007-01-01T23:59:59.000Z

433

A real-time borehole correction of electromagnetic wave resistivity logging while drilling  

Science Journals Connector (OSTI)

Abstract The response of electromagnetic wave logging while drilling is influenced greatly by borehole and drilling fluid resistivity when the size of borehole is relatively large and drilling fluid resistivity is low. Borehole radius and drilling fluid resistivity were introduced to obtain more accurate transformed resistivity on the basis of the commonly used resistivity transformation model. The influence of borehole was considered in the newly established three dimensional transformation model, and a new borehole correction method was proposed. The resistivity transformation database can be established by calculation according to a certain instrument, and the true resistivity is obtained by three dimensional interpolation search technology of real-time correction in practical use. The results of numerical simulation and modeling verification show that the transformed resistivity by real-time correction coincides with the resistivity corrected by charts. The method can eliminate the borehole influence, reduce calculation dimension, and improve the inversion efficiency of highly deviated and horizontal wells logging data.

Zhen YANG; Jinzhou YANG; Laiju HAN

2013-01-01T23:59:59.000Z

434

Solid Waste Information and Tracking System (SWITS) data change request log  

SciTech Connect (OSTI)

The Data Change Request (DCR) log is designed to promote data integrity within the Solid Waste Information and Tracking System (SWITS). It achieves this function by providing a record of all data changes performed on the database. This document contains records of those data changes from March 91 through June 94. The DCR log is also a supplement to an electronic database -- the DCR Tracking System, which provides an electronic record of all data changes preformed on the SWITS database. The records found in this document are Data Change Request forms. These forms are required for SWITS users who wish to request data changes in the database. The procedure formalizing this policy did not go into effect until September 1, 1994; therefore, some records created before that date may be incomplete.

McKay, R.B.

1994-08-18T23:59:59.000Z

435

A Uniqueness Result for Minimizers of the 1D Log-gas Renormalized Energy  

E-Print Network [OSTI]

Sandier and Serfaty studied the one-dimensional Log-gas model, in particular they gave a crystallization result by showing that the one-dimensional lattice $\\mathbb{z}$ is a minimizer for the so-called renormalized energy which they obtained as a limit of the $N$-particle Log-gas Hamiltonian for $N \\to \\infty$. However, this minimizer is not unique among infinite point configurations (for example small perturbations of $\\mathbb{z}$ leave the renormalized energy unchanged). In this paper, we establish that uniqueness holds at the level of (stationary) point processes, the only minimizer being given by averaging $\\mathbb{z}$ over a choice of the origin in $[0,1]$. This is proved by showing a quantitative estimate on the two-point correlation function of a process in terms of its renormalized energy.

Thomas Lebl

2014-08-10T23:59:59.000Z

436

Density Log at Valles Caldera - Redondo Area (Wilt & Haar, 1986) | Open  

Open Energy Info (EERE)

Valles Caldera - Redondo Area (Wilt & Haar, 1986) Valles Caldera - Redondo Area (Wilt & Haar, 1986) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Density at Valles Caldera - Redondo Area (Wilt & Haar, 1986) Exploration Activity Details Location Valles Caldera - Redondo Area Exploration Technique Density Log Activity Date Usefulness not indicated DOE-funding Unknown Notes The density log indicates three major density units within the well section : a surface layer of caldera fill, lake deposits, and other recent alluvium (2.12 g/cm3); the Bandelier Tuff and underlying volcanic and sedimentary units (2.3--2.5 g/cm3); and the basement unit, consisting of the lower Paleozoic and the upper Precambrian (2.65 g/cm3). There are, of course, significant density variations within each unit, but for modeling

437

Gamma-Ray Polarimetry of Two X-Class Solar Flares  

E-Print Network [OSTI]

We have performed the first polarimetry of solar flare emission at gamma-ray energies (0.2-1 MeV). These observations were performed with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) for two large flares: the GOES X4.8-class solar flare of 2002 July 23, and the X17-class flare of 2003 October 28. We have marginal polarization detections in both flares, at levels of 21% +/- 9% and -11% +/- 5% respectively. These measurements significantly constrain the levels and directions of solar flare gamma-ray polarization, and begin to probe the underlying electron distributions.

Steven E. Boggs; W. Coburn; E. Kalemci

2005-10-19T23:59:59.000Z

438

A fast photon counting camera for {gamma}-ray pulsar astronomy  

SciTech Connect (OSTI)

The Electron Multiplying CCD (EMCCD) astronomical camera, under development at the Institute of Astronomy UNAM, will be able to obtain images of faint optical objects with very low instrumental noise and short integration times. The EMCCD is a normal CCD with an additional multiplication register located before the input of the readout amplifier. This will be a very suitable instrument to search for optical pulsations of unidentified gamma-ray sources, specially with GLAST entering the realm of radio quiet gamma-ray loud pulsars.

Orozco, Benito; Carraminana, Alberto [Inst. Nacional de Astrofisica, Optica y Electronica, Luis Enrique Erro 1, Tonantzintla, Puebla 72840 (Mexico); Michel, Raul; Zazueta, Salvador [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, A.P. 877, Ensenada, BC 22800 (Mexico); Fordham, John L. A. [Department of Physics and Astronomy, University College London, Gower Street, London (United Kingdom)

2007-07-12T23:59:59.000Z

439

Weekly Security Incident Log Period of Apr 28 -May 4, 2014  

E-Print Network [OSTI]

member who was previously trespassed from campus several years prior. No further action was required. 5/2 transported the individual to hospital for further medical care. 5/2/2014 10:10 AM Emergency Medical 2014 in a washroom. 5/2/2014 03:18 PM Theft, Under Printed: 5/5/2014 4:13:20 PM 1Weekly Security Incident Log Period

440

Recognition of hydrocarbon expulsion using well logs: Bakken Formation, Williston Basin  

SciTech Connect (OSTI)

The Upper Mississippian-Lower Devonian Bakken Formation forms a source/carrier/reservoir system in the Williston basin. Hydrocarbon expulsion within the Bakken has been identified by overlaying sonic and resistivity logs. Typically, these curves track in organically lean, water-saturated mudrocks because both respond mainly to porosity; however, in thermally mature organic-rich rocks and hydrocarbon reservoirs or carrier beds, the curves separate due to the anomalously high resistivity associated with replacement of pore water by hydrocarbons. Sonic/resistivity-log overlays for wells throughout the Montana and North Dakota parts of the Williston basin reveal significant increases and maximum in-curve separation within the middle siltstone member of the Bakken at subsurface temperatures of about 170 and 200{degree}F, respectively. Sequence-stratigraphic characteristics of the Bakken define the framework within which the expulsion process operates. The organic-rich upper and lower shale members represent the transgressive and early highstand systems tracts of two adjacent depositional sequences. A sequence boundary within the intervening middle siltstone member separates nearshore siltstone and sandstone of the late highstand systems tract in the lower sequence from cross-bedded subtidal to intertidal sandstones of the lowstand systems tract in the upper sequence. Reservoir properties vary across this sequence boundary. The authors attribute the log separation in the siltstone member to hydrocarbons expelled from the adjacent shales. Abrupt shifts in several geochemical properties of the shale members, indicative of hydrocarbon generation occur over the same subsurface temperature range as the rapid increase in log separation in the middle siltstone, thus indicating the contemporaneity of generation and expulsion.

Cunningham, R.; Zelt, F.B.; Morgan, S.R.; Passey, Q.R. (Exxon Production Research Co., Houston, TX (USA)); Snavely, P.D. III; Webster, R.L. (Exxon Co., U.S.A., Houston, TX (USA))

1990-05-01T23:59:59.000Z

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


441

Black Stars and Gamma Ray Bursts  

E-Print Network [OSTI]

Stars that are collapsing toward forming a black hole but are frozen near the Schwarzschild horizon are termed ``black stars''. Collisions of black stars, in contrast to black hole collisions, may be sources of gamma ray bursts, whose basic parameters are estimated quite simply and are found to be consistent with observed gamma ray bursts. Black star gamma ray bursts should be preceded by gravitational wave emission similar to that from the coalescence of black holes.

Tanmay Vachaspati

2007-06-08T23:59:59.000Z

442

Lithology determination from well logs with fuzzy associative memory neural network  

SciTech Connect (OSTI)

An artificial intelligence technique of fuzzy associative memory is used to determine rock types from well-log signatures. Fuzzy associative memory (FAM) is a hybrid of neutral network and fuzzy expert system. This new approach combines the learning ability of neural network and the strengths of fuzzy linguistic modeling to adaptively infer lithologies from well-log signatures based on (1) the relationships between the lithology and log signature that the neural network have learned during the training and/or (2) geologist`s knowledge about the rocks. The method is applied to a sequence of the Ordovician rock units in northern Kansas. This paper also compares the performances of two different methods, using the same data set for meaningful comparison. The advantages of FAM are (1) expert knowledge acquired by geologists is fully utilized; (2) this knowledge is augmented by the neural network learning from the data, when available; and (3) FAM is transparent in that the knowledge is explicitly stated in the fuzzy rules.

Chang, H.C.; Chen, H.C.; Fang, J.H. [Univ. of Alabama, Tuscaloosa, AL (United States)

1997-05-01T23:59:59.000Z

443

Axion Dilaton Coupling and Gamma Ray Bursts  

Science Journals Connector (OSTI)

Axions emitted in supernovae are interesting candidates to account for Gamma-Ray Bursts provided their energy can be effectively converted...

O. Bertolami

1999-01-01T23:59:59.000Z

444

Gamma ray burst outflows and afterglows.  

E-Print Network [OSTI]

?? We carry out a theoretical investigation of jet propagation in Gamma Ray Bursts and examine the jitter radiation mechanism as a means of producing (more)

Morsony, Brian J.

2009-01-01T23:59:59.000Z

445

Gamma Ray Burst Central Engines  

E-Print Network [OSTI]

I review aspects of the theory of long-duration gamma-ray burst (GRB) central engines. I focus on the requirements of any model; these include the angular momentum of the progenitor, the power, Lorentz factor, asymmetry, and duration of the flow, and both the association and the non-association with bright supernovae. I compare and contrast the collapsar and millisecond proto-magnetar models in light of these requirements. The ability of the latter model to produce a flow with Lorentz factor ~100 while simultaneously maintaining a kinetic luminosity of ~10^50 ergs/s for a timescale of ~10-100 s is emphasized.

Todd A. Thompson

2008-07-04T23:59:59.000Z

446

Gamma?ray burst spectroscopy  

Science Journals Connector (OSTI)

The statistics and physical properties of gamma ray burst spectral features are presented following a brief review of early theoretical predictions of and experimental searches for such emission. The ?100 observations of 50 keV absorption and 400 keV emission features constitute the largest data base on neutron star lines. Although the statistical significance of individual observations is often weak and interpretation of these features as cyclotron absorption and annihilation radiation poses some theoretical problems it is clear that future observations may have far?reaching implications.

K. Hurley

1988-01-01T23:59:59.000Z

447

Gamma Ray Burst Central Engines  

Science Journals Connector (OSTI)

I review aspects of the theory of long?duration gamma?ray burst (GRB) central engines. I focus on requirements of any model; these include the angular momentum of the progenitor the power Lorentz factor asymmetry and duration of the flow and both the association and the non?association with bright supernovae. I compare and contrast the collapsar and millisecond proto?magnetar models in light of these requirements. The ability of the latter model to produce a flow with Lorentz factor ?100 while simultaneously maintaining a kinetic luminosity of ?10 50 ? ergs ? s ?1 for a timescale of ?10100? s is emphasized.

Todd A. Thompson

2008-01-01T23:59:59.000Z

448

Gravitational Waves versus X and Gamma Ray Emission in a Short Gamma-Ray Burst  

E-Print Network [OSTI]

The recent progress in the understanding the physical nature of neutron star equilibrium configurations and the first observational evidence of a genuinely short gamma-ray burst, GRB 090227B, allows to give an estimate of the gravitational waves versus the X and Gamma-ray emission in a short gamma-ray burst.

F. G. Oliveira; Jorge A. Rueda; Remo Ruffini

2014-03-28T23:59:59.000Z

449

State of fallen logs and the occurrence of conifer seedlings and saplings in boreal and subalpine old-growth forests in Japan  

Science Journals Connector (OSTI)

Fallen logs on the forest floor play an important role in tree ... seedling establishment in boreal and subalpine old-growth forests. We examined the abundance and state ( ... their surfaces) of fallen logs on th...

Yoshiko Narukawa; Shigeo Iida; Hiroyuki Tanouchi; Shin Abe

2003-05-01T23:59:59.000Z

450

Determination of capillary displacement pressure and representative average capillary pressure vs. depth in shally sandstones from well logs  

SciTech Connect (OSTI)

This research presents a method whereby the capillary displacement pressure Pcd and the representative average capillary pressure in shaly sandstone reservoirs exhibits continuous information vs. depth from well logs. By the aid of special core analysis, correlation functions were obtained that relate the capillary characteristics of the reservoir rock to its lithologic development. Since the lithologic influence factor is a well log-derived parameter the correlations then were used to determine by means of well logs the capillary displacement and average capillary pressures for borehole sections where special core analysis is not available. This technique has been developed and applied to the shaly sandstone reservoir of the Sarir oil field in Libya.

Barlai, Z.; Berruin, N.A.; Mawla, R.A.

1981-01-01T23:59:59.000Z

451

CONSTRAINTS ON VERY HIGH ENERGY GAMMA-RAY EMISSION FROM GAMMA-RAY BURSTS R. Atkins,1,2  

E-Print Network [OSTI]

CONSTRAINTS ON VERY HIGH ENERGY GAMMA-RAY EMISSION FROM GAMMA-RAY BURSTS R. Atkins,1,2 W. Benbow,3 emission from gamma-ray bursts (GRBs) during the prompt emission phase. Detection of >100 GeV counterparts on potential GRB models. Subject headinggs: gamma rays: bursts -- gamma rays: observations 1. INTRODUCTION

California at Santa Cruz, University of

452

Properties of Ly-alpha and Gamma Ray Burst selected starbursts at high redshifts  

E-Print Network [OSTI]

Selection of starbursts through either deep narrow band imaging of redshifted Ly-alpha emitters, or localisation of host galaxies of gamma-ray bursts both give access to starburst galaxies that are significantly fainter than what is currently available from selection techniques based on the continuum (such as Lyman-break selection). We here present results from a survey for Ly-alpha emitters at z=3, conducted at the European Southern Observatory's Very Large Telescope. Furthermore, we briefly describe the properties of host galaxies of gamma-ray bursts at z>2. The majority of both Ly-alpha and gamma-ray burst selected starbursts are fainter than the flux limit of the Lyman-break galaxy sample, suggesting that a significant fraction of the integrated star formation at z~3 is located in galaxies at the faint end of the luminosity function.

J. P. U. Fynbo; B. Krog; K. Nilsson; G. Bjornsson; J. Hjorth; P. Jakobsson; C. Ledoux; P. Moller; B. Thomsen

2004-12-14T23:59:59.000Z

453

Observations of Gamma-Ray Bursts at Extreme Energies  

E-Print Network [OSTI]

of Gamma-Ray Bursts . . . . . . . . . . . . . Redshift-CRUZ OBSERVATIONS OF GAMMA-RAY BURSTS AT EXTREME ENERGIES AAncient Unvierse with Gamma-Ray Bursts, pages 330333. AIP,

Aune, Taylor

2012-01-01T23:59:59.000Z

454

Recoilless Nuclear Resonance Absorption of Gamma Radiation  

Science Journals Connector (OSTI)

...GAMMA-RAYS, ARKIV FOR FYSIK 6 : 49 ( 1953...OF GAMMA-RAYS - THEORY AND PRELIMINARY EXPERIMENTS...energy loss. The basic feature of this method...prediction of the theory was that the recoilless...formulation of the theory that the mo-mentum...Malmfors, Arkiv Fysik 6, 49 (1953...

Rudolf L. Mssbauer

1962-09-07T23:59:59.000Z

455

The GAMMA-400 gamma-ray telescope characteristics. Angular resolution and electrons/protons separation  

E-Print Network [OSTI]

The measurements of gamma-ray fluxes and cosmic-ray electrons and positrons in the energy range from 100 MeV to several TeV, which will be implemented by the specially designed GAMMA-400 gamma-ray telescope, concern with the following broad range of science topics. Searching for signatures of dark matter, surveying the celestial sphere in order to study gamma-ray point and extended sources, measuring the energy spectra of Galactic and extragalactic diffuse gamma-ray emission, studying gamma-ray bursts and gamma-ray emission from the Sun, as well as high precision measuring spectra of high-energy electrons and positrons, protons and nuclei up to the knee. To clarify these scientific problems with the new experimental data the GAMMA-400 gamma-ray telescope possesses unique physical characteristics comparing with previous and present experiments. For gamma-ray energies more than 100 GeV GAMMA-400 provides the energy resolution of ~1% and angular resolution better than 0.02 deg. The methods developed to reconstru...

Leonov, A A; Bonvicini, V; Topchiev, N P; Adriani, O; Aptekar, R L; Arkhangelskaja, I V; Arkhangelskiy, A I; Bergstrom, L; Berti, E; Bigongiari, G; Bobkov, S G; Boezio, M; Bogomolov, E A; Bonechi, S; Bongi, M; Bottai, S; Boyarchuk, K A; Castellini, G; Cattaneo, P W; Cumani, P; Dedenko, G L; De Donato, C; Dogiel, V A; Gorbunov, M S; Gusakov, Yu V; Hnatyk, B I; Kadilin, V V; Kaplin, V A; Kaplun, A A; Kheymits, M D; Korepanov, V E; Larsson, J; Loginov, V A; Longo, F; Maestro, P; Marrocchesi, P S; Mikhailov, V V; Mocchiutti, E; Moiseev, A A; Mori, N; Moskalenko, I V; Naumov, P Yu; Papini, P; Pearce, M; Picozza, P; Popov, A V; Rappoldi, A; Ricciarini, S; Runtso, M F; Ryde, F; Serdin, O V; Sparvoli, R; Spillantini, P; Suchkov, S I; Tavani, M; Taraskin, A A; Tiberio, A; Tyurin, E M; Ulanov, M V; Vacchi, A; Vannuccini, E; Vasilyev, G I; Yurkin, Yu T; Zampa, N; Zirakashvili, V N; Zverev, V G

2014-01-01T23:59:59.000Z

456

The usability of switchgrass, rice straw, and logging residue as feedstocks for power generation in East Texas  

E-Print Network [OSTI]

This thesis examines the economic implications of using agriculturally based feedstock for bio-energy production in East Texas. Specifically I examined the use of switchgrass, rice straw, and logging residue as a feedstock for electrical power...

Hong, Sung Wook

2007-09-17T23:59:59.000Z

457

Stability of finite difference numerical simulations of acoustic logging-while-drilling with different perfectly matched layer schemes  

Science Journals Connector (OSTI)

In acoustic logging-while-drilling (ALWD) finite difference in time domain (FDTD) simulations, large drill collar occupies, most of the fluid-filled borehole and divides the borehole fluid into two thin fluid col...

Hua Wang; Guo Tao; Xue-Feng Shang; Xin-Ding Fang; Daniel R. Burns

2013-12-01T23:59:59.000Z

458

Thermal neutron capture gamma-rays  

SciTech Connect (OSTI)

The energy and intensity of gamma rays as seen in thermal neutron capture are presented. Only those (n,..cap alpha..), E = thermal, reactions for which the residual nucleus mass number is greater than or equal to 45 are included. These correspond to evaluations published in Nuclear Data Sheets. The publication source data are contained in the Evaluated Nuclear Structure Data File (ENSDF). The data presented here do not involve any additional evaluation. Appendix I lists all the residual nuclides for which the data are included here. Appendix II gives a cumulated index to A-chain evaluations including the year of publication. The capture gamma ray data are given in two tables - the Table 1 is the list of all gamma rays seen in (n,..gamma..) reaction given in the order of increasing energy; the Table II lists the gamma rays according to the nuclide.

Tuli, J.K.

1983-01-01T23:59:59.000Z

459

Image Resources  

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

Mosaic of earth and sky images Mosaic of earth and sky images Image Resources Free image resources covering energy, environment, and general science. Here are some links to energy- and environment-related photographic databases. Berkeley Lab Photo Archive Berkeley Lab's online digital image collection. National Science Digital Library (NSDL) NSDL is the Nation's online library for education and research in science, technology, engineering, and mathematics. The World Bank Group Photo Library A distinctive collection of over 11,000 images that illustrate development through topics such as Agriculture, Education, Environment, Health, Trade and more. Calisphere Compiles the digital collections of libraries, museums, and cultural heritage organizations across California, and organizes them by theme, such

460

Reaction Rate Sensitivity of the gamma-Process Path  

E-Print Network [OSTI]

The location of the (gamma,p)/(gamma,n) and (gamma,alpha)/(gamma,n) line at gamma-process temperatures is discussed, using recently published reaction rates based on global Hauser-Feshbach calculations. The results can directly be compared to previously published, classic gamma-process discussions. The nuclei exhibiting the largest sensitivity to uncertainties in nuclear structure and reaction parameters are specified.

T. Rauscher

2004-07-16T23:59:59.000Z

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


461

Nickel-based superalloy operating temperature determination via analysis of gamma/gamma' microstructure and coating/base material interdiffusion  

E-Print Network [OSTI]

The average operating temperature of REN N5 high pressure turbine blades was evaluated via [gamma]/[gamma]' microstructure and coating/base metal interdiffusion methods. The [gamma]' volume fraction was measured by point ...

Ham, Wendy D. (Wendy Decker)

2005-01-01T23:59:59.000Z

462

EMSL - Imaging  

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

imaging en Diffusional Motion of Redox Centers in Carbonate Electrolytes . http:www.emsl.pnl.govemslwebpublicationsdiffusional-motion-redox-centers-carbonate-electrolytes

463

Neutron And Gamma Detector Using An Ionization Chamber With An...  

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

Neutron And Gamma Detector Using An Ionization Chamber Neutron And Gamma Detector Using An Ionization Chamber With An Integrated Body And Moderator A detector for detecting...

464

Gamma-insensitive optical sensor  

DOE Patents [OSTI]

An ultra-violet/visible/infra-red gamma-insensitive gas avalanche focal plane array comprising a planar photocathode and a planar anode pad array separated by a gas-filled gap and across which is applied an electric potential. Electrons ejected from the photocathode are accelerated sufficiently between collisions with the gas molecules to ionize them, forming an electron avalanche. The gap acts like a proportional counter. The array of anode pad are mounted on the front of an anode plate and are connected to matching contact pads on the back of the anode via feed through wires. Connection of the anode to signal processing electronics is made from the contact pads using standard indium bump techniques, for example.

Kruger, Hans W. (Walnut Creek, CA)

1994-01-01T23:59:59.000Z

465

Gamma-insensitive optical sensor  

DOE Patents [OSTI]

An ultraviolet/visible/infrared gamma-insensitive gas avalanche focal plane array is described comprising a planar photocathode and a planar anode pad array separated by a gas-filled gap and across which is applied an electric potential. Electrons ejected from the photocathode are accelerated sufficiently between collisions with the gas molecules to ionize them, forming an electron avalanche. The gap acts like a proportional counter. The array of anode pad are mounted on the front of an anode plate and are connected to matching contact pads on the back of the anode via feed through wires. Connection of the anode to signal processing electronics is made from the contact pads using standard indium bump techniques, for example. 6 figures.

Kruger, H.W.

1994-03-15T23:59:59.000Z

466

Application of Multi-rate Flowing Fluid Electric ConductivityLogging Method to Well DH-2, Tono Site, Japan  

SciTech Connect (OSTI)

The flowing fluid electric conductivity (FEC) logging method, wellbore fluid is replaced with de-ionized water, following which FEC profiles in the wellbore are measured at a series of times while the well is pumped at a constant rate. Locations were fluid enters the wellbore show peaks in the FEC logs, which may be analyzed to infer inflow strengths and salinities of permeable features intersected by the wellbore. In multi-rate flowing FEC logging, the flowing FEC logging method is repeated using two or more pumping rates, which enables the transmissivities and inherent pressure heads of these features to be estimated as well. We perform multi-rate FEC logging on a deep borehole in fractured granitic rock, using three different pumping rates. Results identify 19 hydraulically conducting fractures and indicate that transmissivity, pressure head, and salinity vary significantly among them. By using three pumping rates rather than the minimum number of two, we obtain an internal consistency check on the analysis that provides a measure of the uncertainty of the results. Good comparisons against static FEC profiles and against independent chemical, geological, and hydrogeological data have further enhanced confidence in the results of the multi-rate flowing FEC logging method.

Doughty, Christine; Takeuchi, Shinji; Amano, Kenji; Shimo, Michito; Tsang, Chin-Fu

2004-10-04T23:59:59.000Z

467

EVIDENCE OF CONTRIBUTION OF INTERVENING CLOUDS TO GAMMA-RAY BURST'S X-RAY COLUMN DENSITY  

SciTech Connect (OSTI)

The origin of excess of X-ray column density with respect to optical extinction in gamma-ray bursts (GRBs) is still a puzzle. A proposed explanation of the excess is the photoelectric absorption due to the intervening clouds along a GRB's line of sight. Here, we test this scenario by using the intervening Mg II absorption as a tracer of the neutral hydrogen column density of the intervening clouds. We identify a connection between the large X-ray column density (and large column density ratio of log (N{sub H,X}/N{sub H{sub I}})?0.5) and large neutral hydrogen column density probed by the Mg II doublet ratio (DR). In addition, GRBs with large X-ray column density (and large ratio of log (N{sub H,X}/N{sub H{sub I}})>0) tend to have multiple saturated intervening absorbers with DR < 1.2. These results therefore indicate an additional contribution from the intervening system to the observed X-ray column density in some GRBs, although the contribution from the host galaxy alone cannot be excluded based on this study.

Wang, J., E-mail: wj@bao.ac.cn [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)

2013-10-20T23:59:59.000Z

468

A log-exponential smoothing method for mathematical programs with complementarity constraints  

Science Journals Connector (OSTI)

In this paper a log-exponential smoothing method for mathematical programs with complementarity constraints (MPCC) is analyzed, with some new interesting properties and convergence results provided. It is shown that the stationary points of the resulting smoothed problem converge to the strongly stationary point of MPCC, under the linear independence constraint qualification (LICQ), the weak second-order necessary condition (WSONC), and some reasonable assumption. Moreover, the limit point satisfies the weak second-order necessary condition for MPCC. A notable fact is that the proposed convergence results do not restrict the complementarity constraint functions approach to zero at the same order of magnitude.

Yanyan Li; Tao Tan; Xingsi Li

2012-01-01T23:59:59.000Z

469

High-voltage supply for neutron tubes in well-logging applications  

DOE Patents [OSTI]

A high voltage supply is provided for a neutron tube used in well logging. The biased pulse supply of the invention combines DC and full pulse techniques and produces a target voltage comprising a substantial negative DC bias component on which is superimposed a pulse whose negative peak provides the desired negative voltage level for the neutron tube. The target voltage is preferably generated using voltage doubling techniques and employing a voltage source which generates bipolar pulse pairs having an amplitude corresponding to the DC bias level.

Humphreys, D.R.

1982-09-15T23:59:59.000Z

470

A method for removing arm backscatter from EPID images  

SciTech Connect (OSTI)

Purpose: To develop a method for removing the support arm backscatter from images acquired using current Varian electronic portal imaging devices (EPIDs).Methods: The effect of arm backscatter on EPID images was modeled using a kernel convolution method. The parameters of the model were optimized by comparing on-arm images to off-arm images. The model was used to develop a method to remove the effect of backscatter from measured EPID images. The performance of the backscatter removal method was tested by comparing backscatter corrected on-arm images to measured off-arm images for 17 rectangular fields of different sizes and locations on the imager. The method was also tested using on- and off-arm images from 42 intensity modulated radiotherapy (IMRT) fields.Results: Images generated by the backscatter removal method gave consistently better agreement with off-arm images than images without backscatter correction. For the 17 rectangular fields studied, the root mean square difference of in-plane profiles compared to off-arm profiles was reduced from 1.19% (standard deviation 0.59%) on average without backscatter removal to 0.38% (standard deviation 0.18%) when using the backscatter removal method. When comparing to the off-arm images from the 42 IMRT fields, the mean {gamma} and percentage of pixels with {gamma} < 1 were improved by the backscatter removal method in all but one of the images studied. The mean {gamma} value (1%, 1 mm) for the IMRT fields studied was reduced from 0.80 to 0.57 by using the backscatter removal method, while the mean {gamma} pass rate was increased from 72.2% to 84.6%.Conclusions: A backscatter removal method has been developed to estimate the image acquired by the EPID without any arm backscatter from an image acquired in the presence of arm backscatter. The method has been shown to produce consistently reliable results for a wide range of field sizes and jaw configurations.

King, Brian W. [School of Mathematical and Physics Sciences, University of Newcastle, Newcastle, New South Wales 2308 (Australia); Greer, Peter B. [Department of Radiation Oncology, Calvary Mater Newcastle Hospital, Newcastle, New South Wales 2310 (Australia); School of Mathematical and Physical Sciences, University of Newcastle, Newcastle, New South Wales 2308 (Australia)

2013-07-15T23:59:59.000Z

471

DETECTION OF THE COSMIC {gamma}-RAY HORIZON FROM MULTIWAVELENGTH OBSERVATIONS OF BLAZARS  

SciTech Connect (OSTI)

The first statistically significant detection of the cosmic {gamma}-ray horizon (CGRH) that is independent of any extragalactic background light (EBL) model is presented. The CGRH is a fundamental quantity in cosmology. It gives an estimate of the opacity of the universe to very high energy (VHE) {gamma}-ray photons due to photon-photon pair production with the EBL. The only estimations of the CGRH to date are predictions from EBL models and lower limits from {gamma}-ray observations of cosmological blazars and {gamma}-ray bursts. Here, we present homogeneous synchrotron/synchrotron self-Compton (SSC) models of the spectral energy distributions of 15 blazars based on (almost) simultaneous observations from radio up to the highest energy {gamma}-rays taken with the Fermi satellite. These synchrotron/SSC models predict the unattenuated VHE fluxes, which are compared with the observations by imaging atmospheric Cherenkov telescopes. This comparison provides an estimate of the optical depth of the EBL, which allows us a derivation of the CGRH through a maximum likelihood analysis that is EBL-model independent. We find that the observed CGRH is compatible with the current knowledge of the EBL.

Dominguez, A.; Siana, B. [Department of Physics and Astronomy, University of California, Riverside, CA 92521 (United States); Finke, J. D. [U.S. Naval Research Laboratory, Space Science Division, Code 7653, 4555 Overlook Avenue SW, Washington, DC 20375 (United States); Prada, F. [Campus of International Excellence UAM-CSIC, Cantoblanco, E-28049 Madrid (Spain); Primack, J. R. [Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Kitaura, F. S. [Leibniz-Institut fuer Astrophysik (AIP), An der Sternwarte 16, D-14482 Potsdam (Germany); Paneque, D., E-mail: albertod@ucr.edu [Kavli Institute for Particle Astrophysics and Cosmology, SLAC, Stanford University, Stanford, CA 94305 (United States)

2013-06-10T23:59:59.000Z

472

POLARIZATION AND VARIATION OF NEAR-INFRARED LIGHT FROM FERMI/LAT {gamma}-RAY SOURCES  

SciTech Connect (OSTI)

We present the results of our follow-up observation program of {gamma}-ray sources detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. Twenty-six blazars and thirty-nine sources unidentified at other wavelengths were targeted at the Infrared Survey Facility 1.4 m telescope equipped with the SIRIUS/SIRPOL imager and polarimeter. H-band magnitudes of the blazars at the epoch of 2010 December-2011 February are presented, which reveal clear flux variation since the Two Micron All Sky Survey observations and can be useful data for variation analyses of these objects in longer periods. We also find that nearly half of the {gamma}-ray blazars are highly (>10%) polarized in near-infrared wavelengths. Combining the polarization and variation properties, most ({approx}90%) of the blazars are clearly distinguished from all other types of objects at high Galactic latitudes. On the other hand, we find only one highly polarized and/or variable object in the fields of unidentified sources. This object is a counterpart of the optical variable source PQV1 J131553.00-073302.0 and the radio source NVSS J131552-073301 and is a promising candidate of new {gamma}-ray blazars. From the measured polarization and variation statistics, we conclude that most of the Fermi/LAT unidentified sources are not likely similar types of objects to the known {gamma}-ray blazars.

Fujiwara, M.; Matsuoka, Y. [Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602 (Japan); Ienaka, N., E-mail: matsuoka@a.phys.nagoya-u.ac.jp [Institute of Astronomy, The University of Tokyo, Osawa 2-21-1, Mitaka, Tokyo 181-0015 (Japan)

2012-10-01T23:59:59.000Z

473

Schwarzschild-Couder two-mirror telescope for ground-based gamma-ray astronomy  

E-Print Network [OSTI]

Schwarzschild-type aplanatic telescopes with two aspheric mirrors, configured to correct spherical and coma aberrations, are considered for application in gamma-ray astronomy utilizing the ground-based atmospheric Cherenkov technique. We use analytical descriptions for the figures of primary and secondary mirrors and, by means of numerical ray-tracing, we find telescope configurations which minimize astigmatism and maximize effective light collecting area. It is shown that unlike the traditional prime-focus Davies-Cotton design, such telescopes provide a solution for wide field of view gamma-ray observations. The designs are isochronous, can be optimized to have no vignetting across the field, and allow for significant reduction of the plate scale, making them compatible with finely-pixilated cameras, which can be constructed from modern, cost-effective image sensors such as multi-anode PMTs, SiPMs, or image intensifiers.

Vasilev, V V

2007-01-01T23:59:59.000Z

474

Schwarzschild-Couder two-mirror telescope for ground-based gamma-ray astronomy  

E-Print Network [OSTI]

Schwarzschild-type aplanatic telescopes with two aspheric mirrors, configured to correct spherical and coma aberrations, are considered for application in gamma-ray astronomy utilizing the ground-based atmospheric Cherenkov technique. We use analytical descriptions for the figures of primary and secondary mirrors and, by means of numerical ray-tracing, we find telescope configurations which minimize astigmatism and maximize effective light collecting area. It is shown that unlike the traditional prime-focus Davies-Cotton design, such telescopes provide a solution for wide field of view gamma-ray observations. The designs are isochronous, can be optimized to have no vignetting across the field, and allow for significant reduction of the plate scale, making them compatible with finely-pixilated cameras, which can be constructed from modern, cost-effective image sensors such as multi-anode PMTs, SiPMs, or image intensifiers.

V. V. Vassiliev; S. J. Fegan

2007-08-21T23:59:59.000Z

475

Data Image  

Science Journals Connector (OSTI)

Data image refers to the sum of all information 74/100,000 available in all datasets linked to aspecific name; to all those who have access to databases that name is actually the data image of the real person...

2008-01-01T23:59:59.000Z

476

Hard x-ray imaging from explorer  

SciTech Connect (OSTI)

Coded aperture X-ray detectors were applied to obtain large increases in sensitivity as well as angular resolution. A hard X-ray coded aperture detector concept is described which enables very high sensitivity studies persistent hard X-ray sources and gamma ray bursts. Coded aperture imaging is employed so that approx. 2 min source locations can be derived within a 3 deg field of view. Gamma bursts were located initially to within approx. 2 deg and X-ray/hard X-ray spectra and timing, as well as precise locations, derived for possible burst afterglow emission. It is suggested that hard X-ray imaging should be conducted from an Explorer mission where long exposure times are possible.

Grindlay, J.E.; Murray, S.S.

1981-11-01T23:59:59.000Z

477

Conservative constraints on dark matter annihilation into gamma rays  

SciTech Connect (OSTI)

Using gamma-ray data from observations of the Milky Way, Andromeda (M31), and the cosmic background, we calculate conservative upper limits on the dark matter self-annihilation cross section to monoenergetic gamma rays, <{sigma}{sub A}v>{sub {gamma}}{sub {gamma}}, over a wide range of dark matter masses. (In fact, over most of this range, our results are unchanged if one considers just the branching ratio to gamma rays with energies within a factor of a few of the endpoint at the dark matter mass.) If the final-state branching ratio to gamma rays, Br({gamma}{gamma}), were known, then <{sigma}{sub A}v>{sub {gamma}}{sub {gamma}}/Br({gamma}{gamma}) would define an upper limit on the total cross section; we conservatively assume Br({gamma}{gamma}) > or approx. 10{sup -4}. An upper limit on the total cross section can also be derived by considering the appearance rates of any standard model particles; in practice, this limit is defined by neutrinos, which are the least detectable. For intermediate dark matter masses, gamma-ray-based and neutrino-based upper limits on the total cross section are comparable, while the gamma-ray limit is stronger for small masses and the neutrino limit is stronger for large masses. We comment on how these results depend on the assumptions about astrophysical inputs and annihilation final states, and how GLAST and other gamma-ray experiments can improve upon them.

Mack, Gregory D.; Yueksel, Hasan [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, Ohio 43210 (United States); Jacques, Thomas D.; Bell, Nicole F. [School of Physics, The University of Melbourne, Victoria 3010 (Australia); Beacom, John F. [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, Ohio 43210 (United States); Department of Astronomy, Ohio State University, Columbus, Ohio 43210 (United States)

2008-09-15T23:59:59.000Z

478

Development of a triple modality small animal planar imaging system  

SciTech Connect (OSTI)

Recently small animal research utilizing nuclear medicine based imaging has been combined with structural anatomical imaging from x-ray radiography providing a powerful tool for animal researchers. The addition of a third modality is the goal of our instrumentation development. Thomas Jefferson National Accelerator Facility and Case Western Reserve University have been collaborating on the development of a planar imaging system which in addition to radiopharmaceutical based functional imaging and x-ray radiography structural imaging also allows for the in vivo bioluminescence imaging thus providing another functional imaging modality. For the gamma camera we use is a Hamamatsu position sensitive photomultiplier tube coupled to a pixellated NaI(TI) scintillator array with individual crystal elements 1 mm 1 mm 5 mm in size and a 0.25 mm septum between each element. The gamma camera has a 10 cm diameter active area and can be used for 125I, 99mT and 111In radionuclide imaging. To acquire anatomical information we are using a Rad-Icon Shad-o-Box X-ray detector that provides a field of view of 5 cm 10 cm. The x-ray source is a Source-Ray compact x-ray generator. We are using a Princeton Instruments cooled CCD based detector for the imaging of the bio-distribution of bioluminescence. All three imaging instruments will be integrated into a single light tight / x-ray tight enclosure.

A. G. Weisenberger, Z. Lee, S. Majewski, B. Kross, V. Popov, B. Welch, R. Wojcik, C. Zorn

2006-02-01T23:59:59.000Z

479

Gamma-Ray Bursts and Particle Astrophysics  

E-Print Network [OSTI]

Gamma-ray bursts are violent events occurring randomly in the sky. In this review, I will present the fireball model, proposed to explain the phenomenon of gamma-ray bursts. This model has important consequences for the production and observation at Earth of gravitational waves, high energy neutrinos, cosmic rays and high energy photons, and the second part of this review will be focused on these aspects. A last section will briefly discuss the topic of the use of gamma-ray bursts as standard candles and possible cosmological studies.

B. Gendre

2008-07-24T23:59:59.000Z

480

Gamma-Ray Burst Early Afterglows  

E-Print Network [OSTI]

The successful launch and operation of NASA's Swift Gamma-Ray Burst Explorer open a new era for the multi-wavelength study of the very early afterglow phase of gamma-ray bursts (GRBs). GRB early afterglow information is essential to explore the unknown physical composition of GRB jets, the link between the prompt gamma-ray emission and the afterglow emission, the GRB central engine activity, as well as the immediate GRB environment. Here I review some of the recent theoretical efforts to address these problems and describe how the latest Swift data give answers to these outstanding questions.

Bing Zhang

2005-09-19T23:59:59.000Z

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


481

Quantitative analysis of basin-scale heterogeneities using sonic-log data in the Yanchang Basin  

Science Journals Connector (OSTI)

A random medium is used to investigate reservoir heterogeneities in this study. Random media are characterized by autocorrelation functions that allow a construction of spatially anisotropic random structures with different correlation lengths and fluctuation standard deviations. Based on the analysis, we calculate a power spectrum using fast Fourier transform (FFT), which is observed in spatial wavelengths ranging from a few metres to a few thousand metres. Correlation distance and root mean square (RMS) height are directly obtained from the power spectrum. Numerical experiments show that the correlation length and fluctuation standard deviation can cause correlation distance and RMS height undergoing variations. Combining the characteristics of statistical parameters and sonic-log data, we quantitatively analyse the reservoir heterogeneities in the Yanchang Basin. The correlation distance and RMS height of coarse lithofacies in fluvial sandstones interpret a high-energy deposit and strong heterogeneity, affected by different lithological combinations. The correlation lengths decrease gradually from shales, tight sands to gas-bearing sands. Using the sonic-log data from 28 wells in the Yanchang Basin, we compute the isolines of correlation distances and RMS heights for both the He-8 and Shan-1 members in the studied area, which present a correlation with the distribution of gas. This offers an improved foundation for reservoir lateral prediction.

He-Zhen Wu; Li-Yun Fu; Hong-Kui Ge

2010-01-01T23:59:59.000Z

482

Use of dipmeter logs to refine structural mapping of Teapot Dome, Wyoming  

SciTech Connect (OSTI)

Teapot field, now Naval Petroleum Reserve 3, is an elongated, asymmetric structural dome with a north-northeast axial trend located on the southwest edge of the Powder River basin. Currently, more than 800 wells of various depths penetrate multiple reservoirs; over 30 dipmeter logs have been run during the past 34 years. Although structure contour maps of individual stratigraphic horizons have been drawn simply from conventional well data, more subtle features of deformation are interpreted from the use of dipmeter logs. Because dips are generally less than 15/sup 0/, careful computation of transverse and longitudinal dip directions was required for detailed structural analysis. All depth, dip, and azimuth data were entered into computer files, and a flow chart of steps for computer processing and structural interpretation was devised and followed. As designed by C.A. Bengston, SCAT (Statistical Curvature Analysis Technique) plots were drawn by computer. Interpretation of SCAT plots yielded quantitative descriptions of the asymmetry of Teapot dome, curvature of the anticlinal axial plane, vertical discontinuity of beds, location and orientation of normal faults, and curvature of beds in drag zones adjacent to faults. Structural definition was necessary to outline boundaries of reservoirs with tilted fluid contacts on the flanks of the dome and along fault planes. Location of such faults would be particularly important for the discovery of deeper pools, for instance, in the Tensleep Formation.

Beinkafner, K.J.

1986-08-01T23:59:59.000Z

483

A Search for the Rare Decay $B\\rightarrow\\gamma\\gamma$  

SciTech Connect (OSTI)

We report the result of a search for the rare decay B{sup 0} {yields} {gamma}{gamma} in 426 fb{sup -1} of data, corresponding to 226 million B{sup 0}{bar B}{sup 0} pairs, collected on the {Upsilon}(4S) resonance at the PEP-II asymmetric-energy e{sup +}e{sup -} collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21{sub -12}{sup +13} signal events with a statistical signficance of 1.9 {sigma}. This corresponds to a branching fraction {Beta}(B{sup 0} {yields} {gamma}{gamma}) = (1.7 {+-} 1.1(stat.) {+-} 0.2(syst.)) x 10{sup -7}. Based on this result, we set a 90% confidence level upper limit of {Beta}(B{sup 0} {yields} {gamma}{gamma}) < 3.2 x 10{sup -7}.

del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; Tanabe, T.; /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /Indian Inst. Tech., Guwahati /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /INFN, Naples /Naples U. /NIKHEF, Amsterdam /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas Nuclear Corp., Austin /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-06-02T23:59:59.000Z

484

WARM AND FUZZY: TEMPERATURE AND DENSITY ANALYSIS OF AN Fe XV EUV IMAGING SPECTROMETER LOOP  

SciTech Connect (OSTI)

The Hinode EUV Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) were designed in part to work together. They have the same spatial resolution and cover different but overlapping coronal temperature ranges. These properties make a combined data set ideal for multithermal analysis, where EIS provides the best information on the cooler corona (log T < 6.5) and XRT provides the best information on the hotter corona (log T > 6.5). Here, we analyze a warm non-flaring loop detected in images made in a strong EIS Fe XV emission line with a wavelength of 284.16 A and peak formation temperature of log T = 6.3. We perform differential emission measure (DEM) analysis in three pixels at different heights above the footpoint and find multithermal results with the bulk of the emission measure in the range 6.0 < log T < 6.6. Analysis with the EIS lines alone gave a DEM with huge amounts of emission measure at very high temperatures (log T >7.2); analysis with XRT data alone resulted in a DEM that was missing most of the cooler emission measure required to produce many of the EIS lines. Thus, both results were misleading and unphysical. It was only by combining the EIS and XRT data that we were able to produce a reasonable result, one without ad hoc assumptions on the shape and range of the DEM itself.

Schmelz, J. T.; Rightmire, L. A.; Kimble, J. A.; Worley, B. T.; Pathak, S. [Physics Department, University of Memphis, Memphis, TN 38152 (United States); Saar, S. H., E-mail: jschmelz@memphis.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2011-09-10T23:59:59.000Z

485

Induction log responses to layered, dipping, and anisotropic formations: Induction log shoulder-bed corrections to anisotropic formations and the effect of shale anisotropy in thinly laminated sand/shale sequences  

SciTech Connect (OSTI)

Induction log responses to layered, dipping, and anisotropic formations are examined analytically. The analytical model is especially helpful in understanding induction log responses to thinly laminated binary formations, such as sand/shale sequences, that exhibit macroscopically anisotropic: resistivity. Two applications of the analytical model are discussed. In one application we examine special induction log shoulder-bed corrections for use when thin anisotropic beds are encountered. It is known that thinly laminated sand/shale sequences act as macroscopically anisotropic: formations. Hydrocarbon-bearing formations also act as macroscopically anisotropic formations when they consist of alternating layers of different grain-size distributions. When such formations are thick, induction logs accurately read the macroscopic conductivity, from which the hydrocarbon saturation in the formations can be computed. When the laminated formations are not thick, proper shoulder-bed corrections (or thin-bed corrections) should be applied to obtain the true macroscopic formation conductivity and to estimate the hydrocarbon saturation more accurately. The analytical model is used to calculate the thin-bed effect and to evaluate the shoulder-bed corrections. We will show that the formation resistivity and hence the hydrocarbon saturation are greatly overestimated when the anisotropy effect is not accounted for and conventional shoulder-bed corrections are applied to the log responses from such laminated formations.

Hagiwara, Teruhiko

1996-12-31T23:59:59.000Z

486

Accessing the population of high redshift Gamma Ray Bursts  

E-Print Network [OSTI]

Gamma Ray Bursts (GRBs) are a powerful probe of the high redshift Universe. We present a tool to estimate the detection rate of high-z GRBs by a generic detector with defined energy band and sensitivity. We base this on a population model that reproduces the observed properties of GRBs detected by Swift, Fermi and CGRO in the hard X-ray and gamma-ray bands. We provide the expected cumulative distributions of the flux and fluence of simulated GRBs in different energy bands. We show that scintillator detectors, operating at relatively high energies (e.g. tens of keV to the MeV), can detect only the most luminous GRBs at high redshifts due to the link between the peak spectral energy and the luminosity (Ep-Liso) of GRBs. We show that the best strategy for catching the largest number of high-z bursts is to go softer (e.g. in the soft X-ray band) but with a very high sensitivity. For instance, an imaging soft X-ray detector operating in the 0.2-5 keV energy band reaching a sensitivity, corresponding to a fluence o...

Ghirlanda, G; Ghisellini, G; Mereghetti, S; Tagliaferri, G; Campana, S; Osborne, J P; O'Brien, P; Tanvir, N; Willingale, R; Amati, L; Basa, S; Bernardini, M G; Burlon, D; Covino, S; D'Avanzo, P; Frontera, F; Gotz, D; Melandri, A; Nava, L; Piro, L; Vergani, S D

2015-01-01T23:59:59.000Z

487

Selective document image data compression technique  

DOE Patents [OSTI]

A method of storing information from filled-in form-documents comprises extracting the unique user information in the foreground from the document form information in the background. The contrast of the pixels is enhanced by a gamma correction on an image array, and then the color value of each of pixel is enhanced. The color pixels lying on edges of an image are converted to black and an adjacent pixel is converted to white. The distance between black pixels and other pixels in the array is determined, and a filled-edge array of pixels is created. User information is then converted to a two-color format by creating a first two-color image of the scanned image by converting all pixels darker than a threshold color value to black. All the pixels that are lighter than the threshold color value to white. Then a second two-color image of the filled-edge file is generated by converting all pixels darker than a second threshold value to black and all pixels lighter than the second threshold color value to white. The first two-color image and the second two-color image are then combined and filtered to smooth the edges of the image. The image may be compressed with a unique Huffman coding table for that image. The image file is also decimated to create a decimated-image file which can later be interpolated back to produce a reconstructed image file using a bilinear interpolation kernel.--(235 words)

Fu, Chi-Yung (29 Cameo Way, San Francisco, CA 94131); Petrich, Loren I. (1674 Cordoba St., #4, Livermore, CA 94550)

1998-01-01T23:59:59.000Z

488

Selective document image data compression technique  

DOE Patents [OSTI]

A method of storing information from filled-in form-documents comprises extracting the unique user information in the foreground from the document form information in the background. The contrast of the pixels is enhanced by a gamma correction on an image array, and then the color value of each of pixel is enhanced. The color pixels lying on edges of an image are converted to black and an adjacent pixel is converted to white. The distance between black pixels and other pixels in the array is determined, and a filled-edge array of pixels is created. User information is then converted to a two-color format by creating a first two-color image of the scanned image by converting all pixels darker than a threshold color value to black. All the pixels that are lighter than the threshold color value to white. Then a second two-color image of the filled-edge file is generated by converting all pixels darker than a second threshold value to black and all pixels lighter than the second threshold color value to white. The first two-color image and the second two-color image are then combined and filtered to smooth the edges of the image. The image may be compressed with a unique Huffman coding table for that image. The image file is also decimated to create a decimated-image file which can later be interpolated back to produce a reconstructed image file using a bilinear interpolation kernel. 10 figs.

Fu, C.Y.; Petrich, L.I.

1998-05-19T23:59:59.000Z

489

Towards a deep characterization of a 64-fold-pixelated position sensitive detector for a new {gamma}-scanning system of HPGe segmented detectors  

SciTech Connect (OSTI)

Characterization of the electrical response of the HPGe segmented detectors is one of the current goals for the Nuclear Physics community in order to perform {gamma}-ray tracking or even imaging with these detectors. For this purpose, scanning devices have to be developed to achieve the signal-position association with the highest precision. In this laboratory, a new scanning system, SALSA (Salamanca Lyso-based Scanning Array), consisting on a high spatial resolution {gamma} camera, is a under development. In this work the whole scanning system is presented and first results for the characterization of the {gamma} camera are shown. (authors)

Hernandez-Prieto, A.; Quintana, B. [Laboratorio de Radiaciones Ionizantes, Univ. of Salamanca, 37007 (Spain)

2011-07-01T23:59:59.000Z

490

Gravitational waves and gamma-ray bursts  

E-Print Network [OSTI]

Gamma-Ray Bursts are likely associated with a catastrophic energy release in stellar mass objects. Electromagnetic observations provide important, but indirect information on the progenitor. On the other hand, gravitational waves emitted from the central source, carry direct information on its nature. In this context, I give an overview of the multi-messenger study of gamma-ray bursts that can be carried out by using electromagnetic and gravitational wave observations. I also underline the importance of joint electromagnetic and gravitational wave searches, in the absence of a gamma-ray trigger. Finally, I discuss how multi-messenger observations may probe alternative gamma-ray burst progenitor models, such as the magnetar scenario.

Alessandra Corsi; for the LIGO Scientific Collaboration; for the Virgo Collaboration

2012-05-11T23:59:59.000Z

491

Studying Gamma Ray Bursts from a  

E-Print Network [OSTI]

Studying Gamma Ray Bursts from a new perspective! {... Unraveling some mysteries and adding new Radio Op0cal X-ray Short ( energy -ray photons... ... accompained by a considerable long las0ng emission

?umer, Slobodan

492

Can gamma-ray bursts constrain quintessence?  

E-Print Network [OSTI]

Using the narrow clustering of the geometrically corrected gamma-ray energies released by gamma-ray bursts, we investigate the possibility of using these sources as standard candles to probe cosmological parameters such as the matter density Omega_m and the cosmological constant energy density Omega_Lambda. By simulating different samples of gamma-ray bursts, we find that Omega_m can be determined with accuracy ~7% with data from 300 sources. We also show that, if Omega = 1 is due to a quintessence field, some of the models proposed in the literature may be discriminated from a Universe with cosmological constant, by a similar-sized sample of gamma-ray bursts.

T. Di Girolamo; R. Catena; M. Vietri; G. Di Sciascio

2005-04-27T23:59:59.000Z

493

Gravitational waves and short gamma ray bursts.  

E-Print Network [OSTI]

??Short hard gamma-ray bursts (GRB) are believed to be produced by compact binary coalescences (CBC) { either double neutron stars or neutron star{black hole binaries. (more)

Predoi, Valeriu

2012-01-01T23:59:59.000Z

494

Gamma-Ray Pulsar Studies With GLAST  

SciTech Connect (OSTI)

Some pulsars have their maximum observable energy output in the gamma-ray band, offering the possibility of using these high-energy photons as probes of the particle acceleration and interaction processes in pulsar magnetospheres. After an extended hiatus between satellite missions, the recently-launched AGILE mission and the upcoming Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT) will allow gamma-ray tests of the theoretical models developed based on past discoveries. With its greatly improved sensitivity, better angular resolution, and larger energy reach than older instruments, GLAST LAT should detect dozens to hundreds of new gamma-ray pulsars and measure luminosities, light curves, and phase-resolved spectra with unprecedented resolution. It will also have the potential to find radio-quiet pulsars like Geminga, using blind search techniques. Cooperation with radio and X-ray pulsar astronomers is an important aspect of the LAT team's planning for pulsar studies.

Thompson, D.J.; /NASA, Goddard

2011-11-23T23:59:59.000Z

495

Flares in Gamma Ray Bursts  

Science Journals Connector (OSTI)

The flare activity that is observed in GRBs soon after the prompt emission with the XRT (0.310 KeV) instrument on Board of the Swift satellite is leading to important clues in relation to the physical characteristics of the mechanism generating the emission of energy in Gamma Ray Bursts. We will briefly refer to the results obtained with the recent analysis [1] and [2] and discuss the preliminary results we obtained with a new larger sample of GRBs [limited to early flares] based on fitting of the flares using the Norris 2005 profile. We find in agreement with previous results that XRT flares follow the main characteristics observed in [3] for the prompt emission spikes. The estimate of the flare energy for the subsample with redshift is rather robust and an attempt is made using the redshisft sample to estimate how the energy emitted in flares depends on time. We used a H 0 ?=?70?km/s/Mpc ? ? ?=?0.7 ? m ?=?0.3 cosmology.

G. Chincarini; J. Mao; F. Pasotti; R. Margutti; C. Guidorzi; M. G. Bernardini; Swfit Italian team

2008-01-01T23:59:59.000Z

496

The gamma?ray burst capabilities of BATSE and the Gamma Ray Observatory  

Science Journals Connector (OSTI)

The Gamma Ray Observatory (GRO) scheduled for launch in 1990 will provide new and enhanced capabilities for the study of gamma?ray bursts. These include higher sensitivity increased time resolution broader energy coverage rapid burst data dissemination and burst location by a single spacecraft. All four of the GRO instruments have burst capabilities however the Burst and Transient Source Experiment (BATSE) is designed primarily for the study of gamma?ray bursts. The capabilities of BATSE and the GRO for gamma?ray burst studies are described.

G. J. Fishman

1988-01-01T23:59:59.000Z

497

Gamma Ray Bursts from Ordinary Cosmic Strings  

E-Print Network [OSTI]

We give an upper estimate for the number of gamma ray bursts from ordinary (non-superconducting) cosmic strings expected to be observed at terrestrial detectors. Assuming that cusp annihilation is the mechanism responsible for the bursts we consider strings arising at a GUT phase transition and compare our estimate with the recent BATSE results. Further we give a lower limit for the effective area of future detectors designed to detect the cosmic string induced flux of gamma ray bursts.

R. H. Brandenberger; A. T. Sornborger; M. Trodden

1993-02-12T23:59:59.000Z

498

Gamma Ray Bursts as cosmological tools  

E-Print Network [OSTI]

The use of Gamma Ray Bursts as ``standard candles'' has been made possible by the recent discovery of a very tight correlation between their rest frame intrinsic properties. This correlation relates the GRB prompt emission peak spectral energy E_peak to the energy E_gamma corrected for the collimation angle theta_jet of these sources. The possibility to use GRBs to constrain the cosmological parameters and to study the nature of Dark Energy are very promising.

G. Ghirlanda; G. Ghisellini; L. Nava; C. Firmani

2005-12-30T23:59:59.000Z

499

Neutrinos and Gamma Rays from Galaxy Clusters  

E-Print Network [OSTI]

The next generation of neutrino and gamma-ray detectors should provide new insights into the creation and propagation of high-energy protons within galaxy clusters, probing both the particle physics of cosmic rays interacting with the background medium and the mechanisms for high-energy particle production within the cluster. In this paper we examine the possible detection of gamma-rays (via the GLAST satellite) and neutrinos (via the ICECUBE and Auger experiments) from the Coma cluster of galaxies, as well as for the gamma-ray bright clusters Abell 85, 1758, and 1914. These three were selected from their possible association with unidentified EGRET sources, so it is not yet entirely certain that their gamma-rays are indeed produced diffusively within the intracluster medium, as opposed to AGNs. It is not obvious why these inconspicuous Abell-clusters should be the first to be seen in gamma-rays, but a possible reason is that all of them show direct evidence of recent or ongoing mergers. Their identification with the EGRET gamma-ray sources is also supported by the close correlation between their radio and (purported) gamma-ray fluxes. Under favorable conditions (including a proton spectral index of 2.5 in the case of Abell 85, and si