Note: This page contains sample records for the topic zeus central tracking from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: November 12, 2013.
1

Development of the ZEUS central tracking detector  

Microsoft Academic Search

The design concept and development of the ZEUS central tracking detector is described. This is a cylindrical drift chamber designed for track reconstruction, electron identification and event triggering in a high-crossing-rate, high-magnetic-field environment.

C. B. Brooks; F. W. Bullock; R. J. Cashmore; R. C. Devenish; B. Foster; T. J. Fraser; M. D. Gibson; R. S. Gilmore; D. Gingrich; N. Harnew; J. C. Hart; G. P. Heath; J. Hiddleston; A. R. Holmes; A. K. Jamdagni; T. W. Jones; T. J. Llewellyn; K. R. Long; G. J. Lush; J. Malos; N. C. Martin; I. McArthur; N. A. McCubbin; D. McQuillan; D. B. Miller; M. M. Mobayyen; C. Morgado; J. Nash; G. Nixon; A. G. Parham; B. T. Payne; J. H. C. Roberts; G. Salmon; D. H. Saxon; A. J. Sephton; D. Shaw; T. B. Shaw; P. D. Shield; J. Shulman; I. Silvester; S. Smith; D. E. Strachan; R. J. Tapper; S. M. Tkaczyk; L. W. Toudup; E. W. Wallis; R. Wastie; J. Wells; D. J. White; F. F. Wilson; K. L. Yeo

1989-01-01

2

ZEUS Central Tracking Chamber Second Level Trigger.  

National Technical Information Service (NTIS)

With the very brief interval of 96 ns between bunch crossings, the HERA ep collider puts stringent requirements on the design of trigger and data acquisition systems. The ZEUS detector has a three stage trigger system, the first two levels are component b...

R. C. E. Devenish D. M. Gingrich P. Hallam-Baker G. P. Heath I. McArthur

1989-01-01

3

ZEUS Results  

SciTech Connect

Several results from the ZEUS Collaboration were presented at this Workshop. The highlights are presented in this summary, and include results from NLO QCD fits and determination of {alpha}S, from forward jets and diffractive final states, from pentaquarks and searches and from heavy flavour production. Also the first results from the analysis of the HERA II e+p/e-p data are shown.

Gallo, Elisabetta [INFN Florence (Italy)

2005-10-06

4

Report of the Central Tracking Group  

SciTech Connect

Issues involved in building a realistic central tracking system for a general-purpose 4..pi.. detector for the SSC are addressed. Such a central tracking system must be capable of running at the full design luminosity of 10/sup 33/ cm/sup -2/s/sup -1/. Momentum measurement was required in a general-purpose 4..pi.. detector. Limitations on charged particle tracking detectors at the SSC imposed by rates and radiation damage are reviewed. Cell occupancy is the dominant constraint, which led us to the conclusion that only small cells, either wires or straw tubes, are suitable for a central tracking system at the SSC. Mechanical problems involved in building a central tracking system of either wires or straw tubes were studied, and our conclusion was that it is possible to build such a large central tracking system. Of course, a great deal of research and development is required. We also considered central tracking systems made of scintillating fibers or silicon microstrips, but our conclusion was that neither is a realistic candidate given the current state of technology. We began to work on computer simulation of a realistic central tracking system. Events from interesting physics processes at the SSC will be complex and will be further complicated by hits from out-of-time bunch crossings and multiple interactions within the same bunch crossing. Detailed computer simulations are needed to demonstrate that the pattern recognition and tracking problems can be solved.

Cassel, D.G.; Hanson, G.G.

1986-10-01

5

D0 central tracking chamber performance studies  

SciTech Connect

The performance of the completed DO central tracking chamber was studied using cosmic rays at the State University of New York at Stony Brook. Also studied was a prototype tracking chamber identical in design to the completed DO tracking chamber. The prototype chamber was exposed to a collimated beam of 150 GeV pions at the Fermilab NWA test facility. Results indicate an R{Phi} tracking resolution compatible with the limitations imposed by physical considerations, excellent 2 track resolution, and a high track reconstruction efficiency along with a good rejection power against {gamma} {yields} e {sup +} e{sup {minus}} events.

Pizzuto, D.

1991-12-01

6

Performance measurement of the upgraded D0 central track trigger  

SciTech Connect

The D0 experiment was upgraded in spring 2006 to harvest the full physics potential of the Tevatron accelerator at Fermi National Accelerator Laboratory, Batavia, Illinois, USA. It is expected that the peak luminosity delivered by the accelerator will increase to over 300 x 10{sup 30} cm{sup -2} s{sup -1}. One of the upgraded systems is the Central Track Trigger (CTT). The CTT uses the Central Fiber Tracker (CFT) and Preshower detectors to identify central tracks with p{sub T} > 1.5GeV at the first trigger level. Track candidates are formed by comparing fiber hits to predefined track equations. In order to minimize latency, this operation is performed in parallel using combinatorial logic implemented in FPGAs. Limited hardware resources prevented the use of the full granularity of the CFT. This leads to a high fake track rate as the occupancy increases. In order to mitigate the problem, new track-finding hardware was designed and commissioned. We report on the upgrade and the improved performance of the CTT system.

Mommsen, Remigius, K.; /Manchester U. /Fermilab

2006-12-01

7

Upgrade and Operation of the DZero Central Track Trigger  

SciTech Connect

The D{O} experiment at the Fermilab p{bar p} Tevatron collider (Batavia, IL, USA) has undergone significant upgrades in anticipation of high luminosity running conditions. As part of the upgrade, the capabilities of the Central Track Trigger (CTT) to make trigger decisions based on hit patterns in the Central Fiber Tracker (CFT) have been much improved. We report on the implementation, commissioning and operation of the upgraded CTT system.

Pangilinan, M.P.; /Boston U.; Buehler, M.D.; /Virginia U.

2007-04-01

8

ZEUS calorimeter first level trigger.  

National Technical Information Service (NTIS)

The design of the ZEUS Calorimeter First Level Trigger (CFLT) is presented. The CFLT utilizes a pipelined architecture to provide trigger data for a global first leel trigger decision 5 (mu)sec after each beam crossing, occurring every 96 nsec. The charge...

W. H. Smith I. Ali B. Behrens C. Fordham C. Foudas

1994-01-01

9

ANALYSIS OF THE SECOND ZEUS CRITICAL EXPERIMENT  

SciTech Connect

The Zeus experiments have been designed to test the adequacy of {sup 235}U cross sections in the intermediate energy range. The first Zeus experiment achieved initial criticality on April 26, 1999 with 10 HEU platters and 79 platters of graphite. The second experiment reached a critical condition on October 24, 2000, with 9 HEU platters and 54 platters of graphite. The first experiment, which has been described and analyzed previously, had a C/{sup 235}U ratio of approximately 52:1. The corresponding ratio for the second experiment was approximately 40:1. This summary describes the analysis of the second Zeus critical experiment.

R. MOSTELLER; P. JAEGERS

2001-01-01

10

Intercalibration of the ZEUS high resolution and backing calorimeters.  

National Technical Information Service (NTIS)

We have studied the combined performance of two calorimeters, the high resolution uranium-scintillator prototype of the ZEUS forward calorimeter (FCAL), followed by a prototype of the coarser ZEUS backing calorimeter (BAC), made out of thick iron plates i...

H. Abramowicz H. Czyrkowski A. Derlicki M. Krzyzanowski I. Kudla

1991-01-01

11

ZEUS Concept and Its Wider European Application  

NASA Astrophysics Data System (ADS)

The objectives of the ZEUS project and the resulting concept of an integrated system of transport safety are recapitulated in the article. The context for transport safety management that has evolved since this became a concern of the European Union under the Treaty of Union in 1993 is outlined, and some issues related to applying the ZEUS concept across Europe are discussed. It is concluded that there is scope for exploring ways of doing this, but that the balance of interests at the national and European levels and the difference in nature between safety management on the roads and in the other three main modes will need to be recognised.

Krystek, Ryszard; ?ukowska, Joanna; Michalski, Lech

12

The ZEUS calorimeter first level trigger  

Microsoft Academic Search

The design of the ZEUS Calorimeter First Level Trigger (CFLT) is presented. The CFLT utilizes a pipelined architecture to provide trigger data for a Global First Level Trigger decision 5 ?s after each beam crossing, occurring every 96 ns. The charges from 13 K phototubes are summed into 1792 trigger tower pulseheights which are digitized by flash ADCs. The digital

W. H. Smith; I. Ali; B. Behrens; C. Fordham; C. Foudas; A. Goussiou; M. Jaworski; T. Kinnel; J. Lackey; P. Robl; S. Silverstein; J. W. Dawson; D. A. Krakauer; R. L. Talaga; J. L. Schlereth

1995-01-01

13

Charm Reconstruction in ZEUS Hera II Data  

NASA Astrophysics Data System (ADS)

First HERA II measurements of the cross-section ratio between D* production in e-p and e+p scattering are consistent with 1. In addition, the reconstruction of charm mesons in the ZEUS HERA II data uses secondary vertices reconstructed with the aligned Micro Vertex Detector. The signed decay length significance in case of D0s was studied and in case of D±s used to enrich the signal in DIS.

Karstens, F.

2007-01-01

14

Particle Production and Fragmentation Results from ZEUS  

NASA Astrophysics Data System (ADS)

The review of recent particle production and fragmentation results from ZEUS are presented for deep inelastic scattering (DIS) and photoproduction (PHP) at HERA. The differential cross sections, baryon to antibaryon production asymmetry, baryon to meson production ratios, strange to light hadrons ratios and also Bose-Einstein correlations have been measured using an integrated luminosity of 121 pb-1 of e±p collisions data.

Galas, Anna

2007-11-01

15

Beauty production at HERA using the ZEUS experiment  

Microsoft Academic Search

Beauty quark production in ep collisions is being studied with the ZEUS detector at HERA. The latest measurements of beauty production in deep inelastic scattering and photoproduction regime are presented. The first measurement exploits the potential of the ZEUS microvertex detector to identify beauty in photoproduction dijet events with a muon in the final state. The second is based on

A. Yagües

2008-01-01

16

ON THE RELIABILITY OF ZEUS-3D  

SciTech Connect

Recent and not-so-recent critiques of the widely used magnetohydrodynamics (MHD) code, ZEUS-3D, challenge its reliability and efficiency suggesting that its MHD algorithm is capable of 'significant errors' in some simple one-dimensional shock-tube problems. I show that these concerns are either inapplicable in multi-dimensional astrophysical applications, or result from a misuse of the code rather than 'flaws' in its design. I also describe a few multi-dimensional test problems including one for super-Alfvenic turbulence, and highlight some recent innovations and improvements to the code now available online.

Clarke, David A. [Institute for Computational Astrophysics, Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia B3H 3C3 (Canada)], E-mail: dclarke@ap.smu.ca

2010-03-01

17

Tracing sediment pathways by zircon fission track analysis: Oligocene marine connections in Central Europe  

Microsoft Academic Search

In this study, we use contrasting zircon fission track age signatures of Alpine detritus and detritus derived from the Variscan\\u000a realm to trace sediment pathways in Central Europe. Our data show that the Molasse Basin was connected with the Rhine Graben\\u000a Sea during the Mid-Oligocene, thus joining the North Sea to the Paratethys. Within the Rhine Graben Sea, fairly strong

Cornelia Spiegel; Joachim Kuhlemann; Wolfgang Frisch

2007-01-01

18

A new high-resolution central Saharan dust source map from automated satellite dust plume tracking  

NASA Astrophysics Data System (ADS)

In this paper we outline a new objective dust source detection method for the central Sahara, based on the automated tracking of individual dust plumes in 15 minute, 0.03 degree resolution data from the Spinning Enhanced Visible and Infrared Imager (SEVIRI). The method is used to map the origin of summertime dust storms in the central Sahara for June to August 2004 - 2010. It reveals the sources of these events in unprecedented detail, allowing for the identification of specific, highly active source areas for the first time. The study of collocated surface features reveals that many of the sources are likely associated with palaeo-lakes and outwash plains. Extensive non source areas are associated with low albedo and elevated terrain, pointing to the mountainous regions of the Sahara. Additionally, sand seas are not identified as important source areas, but their margins can be. The automated tracking method also facilitates analysis of the transport direction of dust clouds from key source regions, and the inference of emission mechanisms. It is found that there are two broad domains within the central Sahara: one in southwest Algeria and northwest Mali, characterised primarily by transport to the southeast and very likely dominated by low-level jets embedded in the northeasterly Harmattan winds; and a second in southern Algeria, northeast Niger and northwest Mali where there is no preferred transport direction and a strong potential association between dust events and deep convection, pointing towards cold pool outflows as the likely deflation mechanism.

Ashpole, Ian; Washington, Richard

2013-04-01

19

Interactive monitoring system for backing calorimeter at ZEUS experiment  

NASA Astrophysics Data System (ADS)

This work describes a design and development of the Internet system for the data quality monitoring during the Backing Calorimeter (BAC) operation in the ZEUS experiment and for the archive data analysis. The development includes functional data base system application, data interaction processes and the web interface, built using PHP scripts and JAVA applets. The system implementation process, in ZEUS experiment, was described and its performance results were presented, based on the selected examples.

Pozniak, Krzysztof T.; Romaniuk, Ryszard S.; Jezynski, Tomasz; Luszczak, Zbigniew; Zaczek, Michal

2004-07-01

20

A radiation monitor for the ZEUS detector at HERA  

Microsoft Academic Search

A radiation monitoring and automatic beam-dump system has been installed in the interaction region of the ZEUS experiment during the last upgrade of the electron\\/positron-proton collider HERA. It is used to prevent the ZEUS Silicon Microvertex Detector (MVD) from beam-background induced radiation damage during HERA operation. The dose rate measurement is based on the readout of radiation induced signal currents

Ingo Bloch; Enrico Borsato; Roberto Carlin; Flavio Dal Corso; Dominik Dannheim; Benjamin Kahle; Katarzyna Klimek; U. Kotz; G. Kramberger; A. Longhin; I. Melzer-Pellmann; M. Milite

2003-01-01

21

The ZEUS calorimeter first level trigger  

NASA Astrophysics Data System (ADS)

The design of the ZEUS Calorimeter First Level Trigger (CFLT) is presented. The CFLT utilizes a pipelined architecture to provide trigger data for a Global First Level Trigger decision 5 ?s after each beam crossing, occurring every 96 ns. The charges from 13 K phototubes are summed into 1792 trigger tower pulseheights which are digitized by flash ADCs. The digital values are linearized, stored and used for sums and pattern tests. Summary data is forwarded to the Global First Level Trigger for each crossing 2 ?s after the crossing occurred. The CFLT determines the total energy, the total transverse energy, the missing energy, and the energy and number of isolated electrons and muons. It also provides information on the electromagnetic and hadronic energy deposited in various regions of the calorimeter. The CFLT has kept the experimental trigger rate below ~ 200 Hz at the highest luminosity experienced at HERA. Performance studies suggest that the CFLT will keep the trigger rate below 1 kHz against a rate of proton-beam gas interactions on the order of the 100 kHz expected at design luminosity.

Smith, W. H.; Ali, I.; Behrens, B.; Fordham, C.; Foudas, C.; Goussiou, A.; Jaworski, M.; Kinnel, T.; Lackey, J.; Robl, P.; Silverstein, S.; Dawson, J. W.; Krakauer, D. A.; Talaga, R. L.; Schlereth, J. L.

1995-02-01

22

First Results of the PixelGEM Central Tracking System for COMPASS  

NASA Astrophysics Data System (ADS)

For its physics program with a high-intensity hadron beam of up to 2?107 particles/s, the COMPASS experiment at CERN requires tracking of charged particles scattered by very small angles with respect to the incident beam direction. While good resolution in time and space is mandatory, the challenge is imposed by the high beam intensity, requiring radiation-hard detectors which add very little material to the beam path in order to minimize secondary interactions. To this end, a set of triple-GEM detectors with a hybrid readout structure consisting of pixels in the beam region and 2-D strips in the periphery was designed and built. Successful prototype tests proved the performance of this new detector type, showing both extraordinary high rate capability and detection efficiency. The amplitude information allowed to achieve spatial resolutions about a factor of 10 smaller than the pitch and a time resolution close to the theoretical limit imposed by the layout. The PixelGEM central tracking system consisting of five detectors, slightly improved with respect to the prototype, was completely installed in the COMPASS spectrometer in spring 2008.

Austregesilo, Alexander; Haas, Florian; Ketzer, Bernhard; Konorov, Igor; Krämer, Markus; Mann, Alexander; Nagel, Thiemo; Paul, Stephan; Uhl, Sebastian

2009-12-01

23

Beauty production at HERA using the ZEUS experiment  

NASA Astrophysics Data System (ADS)

Beauty quark production in ep collisions is being studied with the ZEUS detector at HERA. The latest measurements of beauty production in deep inelastic scattering and photoproduction regime are presented. The first measurement exploits the potential of the ZEUS microvertex detector to identify beauty in photoproduction dijet events with a muon in the final state. The second is based on statistical methods to determine the fraction of beauty in photoproduction dijet events with an electron in the final state. Finally, the first measurement by ZEUS of the beauty contribution to the proton structure function, F2bb, in deep inelastic scattering is presented. The three measurements are compared with QCD predictions as well as with previous results. All the results presented here are preliminary.

Yagües, A.

2008-05-01

24

Power collection reduction by mirror surface nonflatness and tracking error for a central receiver solar power system  

Microsoft Academic Search

The effects of random waviness, curvature, and tracking error of plane-mirror heliostats in a rectangular array around a central-receiver solar power system are determined by subdividing each mirror into 484 elements, assuming the slope of each element to be representative of the surface slope average at its location, and summing the contributions of all elements and then of all mirrors

R. H. McFee

1975-01-01

25

Mesozoic and Cenozoic tectonics of the Møre Trøndelag Fault Complex, central Norway: constraints from new apatite fission track data  

Microsoft Academic Search

The Møre Trøndelag Fault Complex (MTFC) of central Norway is a long-lived structural zone whose tectonic history included dextral strike slip, sinistral strike slip, and vertical offset. Determination of an offset history for the MTFC is complicated by the lack of well preserved stratigraphic markers. However, low temperature apatite fission track (AFT) thermochronology offers important new clues by allowing the

T. F. Redfield; T. H. Torsvik; P. A. M. Andriessen; R. H. Gabrielsen

2004-01-01

26

NEUTRON LIFETIME MEASUREMENTS IN THE FAST REACTORS ZEUS AND ZEPHYR  

Microsoft Academic Search

Measurements of mean prompt neutron lifetime were made by a perturbation ; technique, by the use of a reactivity oscillator, and by the Rossi- alpha method ; in which the time correlation of fission chamber pulses is studied. The lifetime ; in Zeus was found to be 7 x 10⁻⁸ sec and in the graphite reflected version ; of Zephyr,

G. Ingram; D. B. McCulloch; J. E. Sanders

1959-01-01

27

Breakup history of central Madagascar: a combined remote sensing &fission track approach  

NASA Astrophysics Data System (ADS)

After collision and amalgamation of East- and West-Gondwana during Late Neoproterozoic times Madagascar had a central position in Gondwana. Following Pan-African ductile deformation, Madagascar underwent a long period of extensional tectonism, associated with basin formation, major faulting, volcanism, exhumation and passive margin formation. We used a combined remote sensing and fission track (FT) approach to obtain more detailed structural indications for the breakup history in Madagascar. Because of insufficient infrastructure and outcrop data in Madagascar, satellite image interpretation is a very useful tool to complete data obtained from field observations and geochronological methods. A set of six Landsat 5 and 7 satellite images, covering most parts of central Madagascar, was used to identify ductile and brittle structures. After image processing, specific regions were selected for detailed investigation. The dominant ductile Pan-African structures in this region are the N-S striking Angavo shear zone and the merely E-W striking Virgation zone. In the western and central part of the island the detailed lineament mapping revealed a reactivation of Pan-African structures with directions N and NW. In contrast, the brittle structures around the Angavo shear zone show clear defined NW and NE directions corresponding to the dominant orientations in the Mascarene basin and are most probably related to the Madagascar-India breakup. 54 FT samples were collected and studied along three W-E cross sections running from the basement/basin contact towards the eastern coast. Titanite FT ages range between 483 ± 33 and 266 ± 13 Ma. Apatite FT ages varies between 460 ± 21 and 79 ± 5 Ma. The oldest titanite FT ages occur in the centre of the island. The titanite FT ages from the western paleo margin are mostly ˜70 Ma older than the apatite FT ages, indicating moderate cooling during the opening of the Karoo basins in this area. The titanite FT ages from the eastern coast are about ˜340 Ma and are significantly older than the apatite FT ages (˜80 Ma), indicating that the breakup related Marion hot spot had probably only a minor thermal (at least <300^oC) effect on the study area. Remote sensing and FT data from samples around the Angavo shear zone suggest a new structural imprint during the Cretaceous breakup. The structural data from the eastern coast with two clearly defined directions argue also for a minor structural influence of the Marion hot spot. Thus, the Cretaceous apatite FT ages are most probably related to flexural denudation during the breakup process.

Kastowski, M.; Emmel, B.; Jacobs, J.

2003-04-01

28

Search for CHARM pentaquarks in ZEUS at HERA  

SciTech Connect

Using the full 1996 - 2000 ZEUS data at HERA (121 pb-1) we have searched for the {theta}{sub c}{sup 0}(3100) pentaquark in the photoproduction and DIS regime. The search has yielded negative results. The 95% C.L. upper limits on the visible rate R({theta}{sub c}{sup 0} {yields} D*p/D*) is 0.23% (0.35% for DIS)

Eisenberg, Yehuda [Weizmann Institute of Science, Rehovot (Israel)

2006-02-11

29

Analysis of the un-moderated Zeus critical experiment  

SciTech Connect

The first four Zeus experiments were designed to test the adequacy of {sup 235}U cross sections in the intermediate-energy range. The un-moderated Zeus experiment discussed herein has the same general configuration as its predecessors but produces a fast spectrum because it contains no moderator. It therefore constitutes an upper-energy endpoint for the first set of Zeus experiments. The MCNP5 Monte Carlo code was used to construct a detailed model of the experiment and to assess the reactivity impact of experimental uncertainties. Results from calculations for that model with four different nuclear data libraries are presented. All of the calculated results differ from the experimental value of k{sub eff} by at least three standard deviations. However, two of them, JENDL-3.3 and ENDF/B-VII {beta}-2, produce excellent agreement with the experimental value when their cross sections for copper are replaced with ENDF/B-V data. Therefore, it is strongly recommended that the fast cross sections for copper be reviewed prior to the first formal release of ENDF/B-VII. A simplified benchmark model of the experiment also was developed, and the specifications for it are included as an Appendix. It is shown that this benchmark model retains the reactivity, spectrum, and other important characteristics of the detailed model. (authors)

Mosteller, R. D.; Jaegers, P. J. [Applied Physics Div., Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

2006-07-01

30

Measurement and Phenomenology of the Proton Structure Function $F_2$ from ZEUS at HERA  

Microsoft Academic Search

Measurements of the proton structure function $F_2$ in the $Q^2$ range $0.6 - 17 \\\\rm GeV^2$ from ZEUS 1995 shifted vertex data and $Q^2 \\\\simeq 1.5 - 20000 \\\\rm GeV^2$ from 1996 and 1997 ZEUS data are presented. From the former and other ZEUS $F_2$ data the slopes $d F_2 \\/ d \\\\ln Q^2$ at fixed $x$ and $d F_2

A. Quadt

1998-01-01

31

Plio-Quaternary exhumation history of the central Nepalese Himalaya: 1. Apatite and zircon fission track and apatite [U-Th]\\/He analyses  

Microsoft Academic Search

New apatite and zircon fission track and (U-Th)\\/He analyses serve to document the bedrock cooling history of the central Nepalese Himalaya near the Annapurna Range. We have obtained 82 apatite fission track (AFT), 7 zircon fission track (ZFT), and 7 apatite (U-Th)\\/He (AHe) ages from samples collected along the Marsyandi drainage, including eight vertical relief profiles from ridges on either

A. E. Blythe; D. W. Burbank; A. Carter; K. Schmidt; J. Putkonen

2007-01-01

32

ZEUS results on the measurement and phenomenology of at low x and low  

Microsoft Academic Search

.   Measurements of the proton structure function for and from ZEUS 1995 shifted vertex data are presented. From ZEUS data the slopes at fixed x and for at fixed are derived. For the latter, E665 data are also used. The transition region in is explored using the simplest non-perturbative models and NLO QCD. The data at very low are described

S. Chekanov; M. Derrick; D. Krakauer; S. Magill; D. Mikunas; B. Musgrave; J. Repond; R. Stanek; R. Yoshida; H. Zhang; G. Abbiendi; F. Anselmo; P. Antonioli; G. Bari; M. Basile; L. Bellagamba; D. Boscherini; A. Bruni; G. Bruni; G. Cara Romeo; G. Castellini; L. Cifarelli; F. Cindolo; A. Contin; N. Coppola; M. Corradi; S. De Pasquale; P. Giusti; G. Iacobucci; G. Laurenti; G. Levi; A. Margotti; T. Massam; R. Nania; F. Palmonari; A. Pesci; A. Polini; G. Sartorelli; Y. Zamora Garcia; A. Zichichi; C. Amelung; A. Bornheim; I. Brock; J. Crittenden; R. Dener; M. Eckert; M. Grothe; H. Hartmann; K. Heinloth; L. Heinz; E. Hilger; A. Kappes; R. Kerger; E. Paul; M. Pfeier; H. Schnurbusch; A. Weber; H. Wieber

1999-01-01

33

Fission-track dating of bentonites and bentonitic mudstones from the Morrison Formation in central Utah  

Microsoft Academic Search

Fission-track ages show that most of the Morrison Formation is Late Jurassic or perhaps earliest Cretaceous, ranging in age from 130 to 157 Ma. However, the upper part of the Morrison Formation in the Brushy Basin Member gives ages ranging from 99 to 123 Ma, covering a wide span of Early Cretaceous time. The bentonites dated are stratigraphically below what

Bart J. Kowallis; Julia S. Heaton

1987-01-01

34

FAST TRACK COMMUNICATION: Semi-classical central charge in topologically massive gravity  

NASA Astrophysics Data System (ADS)

It is shown that the warped black hole geometries discussed recently in arXiv:0807.3040 (Anninos et al 2008) admit an algebra of asymptotic symmetries isomorphic to the semi-direct product of a Virasoro algebra and an algebra of currents. The realization of this asymptotic symmetry by canonical charges allows us to find the central charge of the Virasoro algebra. The right-moving central charge c_R = -\\frac{(5\\hat{\

Compère, Geoffrey; Detournay, Stéphane

2009-01-01

35

FAST TRACK PAPER: A new analytical solution estimating the flexural rigidity in the Central Andes  

NASA Astrophysics Data System (ADS)

We present a new 2-D analytical solution of the fourth-order differential equation, which describes the flexure of a thin elastic plate. The new analytical solution allows the differential equation for an elastic plate to be solved for any irregular shaped topography with a high spatial resolution. We apply the new method to the Central Andes. The flexural rigidity distribution calculated by this technique correlates well with tectonic units and the location of fault zones, for example, the Central Andean Gravity High correlates with the presence of a rigid, high-density body.

Wienecke, S.; Braitenberg, C.; Götze, H.-J.

2007-06-01

36

In the tracks of Tamerlane: Central Asia's path to the twenty?first century  

Microsoft Academic Search

While there is hardly a corner of the world that has not been affected in one way or another by the events of 11 September 2001, the repercussions are especially evident in the region once known as Soviet Central Asia. Previously a backwater of world politics, the attention focused on this area comes at a time when the countries and

Dan Burghart

2002-01-01

37

Power collection reduction by mirror surface nonflatness and tracking error for a central receiver solar power system.  

PubMed

The effects of random waviness, curvature, and tracking error of plane-mirror heliostats in a rectangular array around a central-receiver solar power system are determined by subdividing each mirror into 484 elements, assuming the slope of each element to be representative of the surface slope average at its location, and summing the contributions of all elements and then of all mirrors in the array. Total received power and flux density distribution are computed for a given sun location and set of array parameter values. Effects of shading and blocking by adjacent mirrors are included in the calculation. Alt-azimuth mounting of the heliostats is assumed. Representative curves for two receiver diameters and two sun locations indicate a power loss of 20% for random waviness, curvature, and tracking error of 0.1 degrees rms, 0.002 m(-1), and 0.5 degrees , 3sigma, respectively, for an 18.2-m diam receiver and 0.3 degrees rms, 0.005 m(-1), and greater than 1 degrees , respectively, for a 30.4-m diam receiver. PMID:20154860

McFee, R H

1975-07-01

38

A new high-resolution central and western Saharan summertime dust source map from automated satellite dust plume tracking  

NASA Astrophysics Data System (ADS)

In this paper, we outline a new objective dust source detection method for the central and western Sahara (CWS), based on the automated tracking of individual dust plumes in data from the Spinning Enhanced Visible and Infrared Imager, available every 15 mins. at ~0.03° spatial resolution. The method is used to map the origin of summertime dust storms in the CWS for June - August 2004 - 2010. It reveals the sources of these events in unprecedented detail, allowing for the identification of specific, highly active source areas. The study of collocated surface features reveals that many of the dominant sources are likely associated with paleolakes and outwash plains, many in close proximity to the Saharan mountains. Extensive nonsource areas are associated with low albedo and elevated terrain, pointing to the mountainous regions of the Sahara. Additionally, sand seas are not identified as important source areas, but their margins sometimes are. The automated tracking method also facilitates analysis of the transport direction of dust plumes from key source regions and the inference of emission mechanisms. It is found that there are two broad domains within the CWS: one in southwest Algeria and northwest Mali, characterized primarily by transport toward the southwest and very likely dominated by low-level jets embedded in the northeasterly Harmattan winds; and a second in southern Algeria, northwest Niger, and northeast Mali where there is no preferred transport direction and a strong potential association between dust events and deep convection, pointing toward cold pool outflows as the likely deflation mechanism.

Ashpole, Ian; Washington, Richard

2013-07-01

39

Analysis of Propagation Conditions of ELF Radio Waves on the ``Zeus''-Transbaikalia Path  

NASA Astrophysics Data System (ADS)

We consider the results of measurements of the absolute values of horizontal electric and magnetic components of the electromagnetic field of the ``Zeus'' ELF radio facility at frequencies 33, 44, 82, and 188 Hz, carried out in Transbaikalia. Electromagnetic-field variations during 17 semidiurnal sessions (about 204 hours of synchronous records) are analyzed. The length of the ``Zeus''-Transbaikalia path is approximately 4000 km.

Bashkuev, Yu. B.; Khaptanov, V. B.; Khankharaev, A. V.

2003-12-01

40

Tracking tectonism with terraces: new methods, new insights in the Gulf of Evvia, central Greece  

NASA Astrophysics Data System (ADS)

Coastal terraces are typically the preferred geomorphic marker to calibrate crustal deformation along tectonically active coastlines. Their elevation with respect to a horizontal reference datum - typically sea level - provides a measure of net uplift (or subsidence), whilst their dislocation or tilting can constrain the 3-D deformation field. Such tectonic interpretations, however, rest on the reliable identification, characterisation and measurement of the terraces themselves. To aid extraction of the topographic attributes of terraces from DEMs, we have developed an algorithm that rapidly and consistently delimits the spatial extent of terrace surfaces based on user-defined individual 'seed points'. The extracted topographic attributes can then be manipulated by standard structural geological 3-D visualisation techniques to inform tectonic analyses. We illustrate the methodology with a case study from the northern Gulf of Evvia, Greece. Here, on the Arkitsa headland of the gulf's western shore, a staircase set of topographic benches are carved into the uplifted tip of a major active normal fault, the Kamena Vourla fault. In the field the benches are observed to be multiple unconformable wave-cut platforms, though individual surfaces are locally faulted in places. A 10 x 10m DEM of the headland, extracted photogrammetrically from scanned air-photos, served as the testbed for the terrace delimitation algorithm. The algorithm computed a terrace map which, when combined with the digital topography, defined the altitude, slope and aspect data for each terrace fragment. The data indicate that the terrace fragments conform to two discrete populations that locate either side of a largely ignored transverse lineament, the Livanates fault. Structural reconstruction of pre-deformation terrace geometries track the differential uplift and tilting of terraces across the Livanates fault. Our tectonic interpretation proposes that this fault is an important 'release' structure to the main Kamena Vourla fault, and that this release fault has been operating at most since the penultimate interglacial period.

Dewez, T. J.; Stewart, I. S.; Moore, J. M.

2003-12-01

41

Measurement of diffractive heavy vector meson photoproduction at HERA with the ZEUS detector  

NASA Astrophysics Data System (ADS)

The central aim of this thesis has been the measurement of the elastic process ep ? eJ/psip, studied through the electronic decay in the photoproduction regime over a larger energy range than attained in previous measurements. This has been achieved by the development of a new trigger algorithm, the calibration of the ZEUS calorimeter in a dynamic range unexplored before, and extensive detector and background studies. Results have been obtained with data collected during the 1999 and 2000 running periods. The accuracy of these results largely overshoots that of previous measurements and allow us to draw two main conclusions: data are consistent with no saturation, the photoproduction of J/psi is driven by a mixture of "hard" and "soft" physics. The cross-section ratio, sigma(psi(2 S))/sigma(J/psi), has been calculated using the electron decay channel and is consistent with the suppression of the production of psi(2S) with respect to that of the J/psi, as expected by the quark parton model. Results of the search for Upsilon resonances using the electron decay channel with data taken during the 1996-2000 running periods have been reported. No clear evidence of Upsilon resonances has been found. An overview of VM production at HERA has shown that Q 2 + M2V is a good choice of the scale of the interaction. Data indicate that the dynamics that drive the increase with energy of the total DIS and VM cross-sections are similar.

Mellado, Bruce

42

Tracking induced pluripotent stem cells-derived neural stem cells in the central nervous system of rats and monkeys.  

PubMed

Abstract Despite of the immense breakthroughs of induced pluripotent stem cells (iPSCs), clinical application of iPSCs and their derivates remains hampered by a lack of definitive in vivo studies. Here, we attempted to track iPSCs-derived neural stem cells (NSCs) in the rodent and primate central nervous system (CNS) and explore their therapeutic viability for stem cell replacement in traumatic brain injury (TBI) rats and monkeys with spinal cord injury (SCI). Superparamagnetic iron oxide (SPIO) particles were used to label iPSCs-derived NSCs in vitro. Labeled NSCs were implanted into TBI rats and SCI monkeys 1 week after injury, and then imaged using gradient reflection echo (GRE) sequence by 3.0T magnetic resonance imaging (MRI) scanner. MRI analysis was performed at 1, 7, 14, 21, and 30 days, respectively, following cell transplantation. Pronounced hypointense signals were initially detected at the cell injection sites in rats and monkeys and were later found to extend progressively to the lesion regions, demonstrating that iPSCs-derived NSCs could migrate to the lesion area from the primary sites. The therapeutic efficacy of iPSCs-derived NSCs was examined concomitantly through functional recovery tests of the animals. In this study, we tracked iPSCs-derived NSCs migration in the CNS of TBI rats and SCI monkeys in vivo for the first time. Functional recovery tests showed obvious motor function improvement in transplanted animals. These data provide the necessary foundation for future clinical application of iPSCs for CNS injury. PMID:24020696

Tang, Hailiang; Sha, Hongying; Sun, Huaping; Wu, Xing; Xie, Liqian; Wang, Pu; Xu, Chengshi; Larsen, Christian; Zhang, Helen L; Gong, Ye; Mao, Ying; Chen, Xiancheng; Zhou, Liangfu; Feng, Xiaoyuan; Zhu, Jianhong

2013-09-10

43

Phanerozoic upper crustal tectono-thermal development of basement rocks from central Madagascar: An integrated fission-track and structural study  

Microsoft Academic Search

An integrated study of fission-track (FT) dating and structural geology revealed a complex tectono-thermal history preserved in basement rocks of central Madagascar since the amalgamation of Gondwana at the end of the Cambrian. A detailed study of five domains argues for several cooling steps with associated brittle deformations during the separation of Madagascar.Titanite and apatite FT ages range between 483

B. Emmel; J. Jacobs; M. Kastowski; G. Graser

2006-01-01

44

Using satellite tracking to optimize protection of long-lived marine species: olive ridley sea turtle conservation in Central Africa.  

PubMed

Tractable conservation measures for long-lived species require the intersection between protection of biologically relevant life history stages and a socioeconomically feasible setting. To protect breeding adults, we require knowledge of animal movements, how movement relates to political boundaries, and our confidence in spatial analyses of movement. We used satellite tracking and a switching state-space model to determine the internesting movements of olive ridley sea turtles (Lepidochelys olivacea) (n?=?18) in Central Africa during two breeding seasons (2007-08, 2008-09). These movements were analyzed in relation to current park boundaries and a proposed transboundary park between Gabon and the Republic of Congo, both created to reduce unintentional bycatch of sea turtles in marine fisheries. We additionally determined confidence intervals surrounding home range calculations. Turtles remained largely within a 30 km radius from the original nesting site before departing for distant foraging grounds. Only 44.6 percent of high-density areas were found within the current park but the proposed transboundary park would incorporate 97.6 percent of high-density areas. Though tagged individuals originated in Gabon, turtles were found in Congolese waters during greater than half of the internesting period (53.7 percent), highlighting the need for international cooperation and offering scientific support for a proposed transboundary park. This is the first comprehensive study on the internesting movements of solitary nesting olive ridley sea turtles, and it suggests the opportunity for tractable conservation measures for female nesting olive ridleys at this and other solitary nesting sites around the world. We draw from our results a framework for cost-effective protection of long-lived species using satellite telemetry as a primary tool. PMID:21589942

Maxwell, Sara M; Breed, Greg A; Nickel, Barry A; Makanga-Bahouna, Junior; Pemo-Makaya, Edgard; Parnell, Richard J; Formia, Angela; Ngouessono, Solange; Godley, Brendan J; Costa, Daniel P; Witt, Matthew J; Coyne, Michael S

2011-05-11

45

Proceedings of the workshop on triggering and data acquisition for experiments at the Supercollider.  

National Technical Information Service (NTIS)

This meeting covered the following subjects: triggering requirements for SSC physics; CDF level 3 trigger; D0 trigger design; AMY trigger systems; Zeus calorimeter first level trigger; data acquisition for the Zeus Central Tracking Detector; trigger and d...

R. Donaldson

1989-01-01

46

Construction of the Zeus Forward/Rear Calorimeter Modules at Nikhef.  

National Technical Information Service (NTIS)

The design and assembly procedure of the FCAL/RCAL (Forward (in proton direction) Calorimeter/Rear (in electron direction) Calorimeter) of the Zeus detector to study electron proton interactions at Desy, Hamburg (Germany, F.R.) are detailed. The main comp...

R. Blankers J. Engelen H. Geerinck J. Homma P. Hunck

1990-01-01

47

Finite Element Calculations on Rear Calorimeter Modules for the Zeus Experiment.  

National Technical Information Service (NTIS)

Results of a series of finite element calculations on the rear calorimeter modules of the Zeus detector to study electron proton collisions at the HERA storage ring at Desy, Hamburg (Germany, F.R.) are described. The main motivation is to find out where i...

R. Blankers

1990-01-01

48

Robotic laparoscopic surgery: a comparison of the da Vinci and Zeus systems  

Microsoft Academic Search

Objectives. To evaluate two currently available robotic surgical systems in performing various urologic laparoscopic procedures in an acute porcine model.Methods. Robotic laparoscopic surgery was performed in 14 swine. Data were compared between the da Vinci Robotic System and the Zeus Robotic System.Results. During laparoscopic nephrectomy, the da Vinci System (n = 6) had a significantly shorter total operating room time

Gyung Tak Sung; Inderbir S Gill

2001-01-01

49

“Zeus” a new oral anticoagulant therapy dosing algorithm : A cohort study  

Microsoft Academic Search

The demand for oral anticoagulant therapy (OAT) has constantly increased during the last ten years with an extended use of computer assistance. Many mathematical algorithms have been projected to suggest doses and time to next visit for patients on OAT. We designed a new algorithm: “Zeus”.A “before-after” study was planned to compare the efficacy and safety of this algorithm dosing

A. Cafolla; R. Melizzi; E. Baldacci; P. Pignoloni; F. Dragoni; M. Campanelli; R. Caraccini; R. Foà

2011-01-01

50

Studies of hadron-electron separators for the ZEUS barrel calorimeter  

SciTech Connect

Two possible upgrades, a shower maximum detector and a presampler, designed to improve the low energy electron/hadron separation capabilities of the ZEUS barrel calorimeter are described and test-beam results are reported. The presampler can also be used to correct for energy loss of particles traversing the dead material in front of the calorimeter.

Ambats, I.; Bortz, D.; Connolly, A. [and others

1995-05-25

51

Measurement of the proton structure function at HERA using the ZEUS detector.  

National Technical Information Service (NTIS)

In May 1992, the HERA collider produced its first collisions between electrons and protons, at a center-of-mass energy of 295 GeV. The ZEUS experiment, one of the two main detectors at HERA, recorded 24.7 nb(sup -1) of data in the fall of 1992. The analys...

S. C. M. Bentvelsen

1994-01-01

52

Measurement of HIGH-x Neutral Current Cross Sections with the ZEUS Detector  

NASA Astrophysics Data System (ADS)

A new method is employed to measure the neutral current cross section up to Bjorken-x values equal to one with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. Cross sections have been extracted for Q2 > 500 GeV2 and are compared to Standard Model predictions using different parton density functions.

Caldwell, A.

2007-01-01

53

Measurement of beauty production in DIS and F2b bbar extraction at ZEUS  

Microsoft Academic Search

Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb?1. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative

H. Abramowicz; P. Kooijman; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; P. Antonioli; A. Antonov; M. Arneodo; V. Aushev; Y. Aushev; O. Bachynska; A. Bamberger; A. N. Barakbaev; G. Barbagli; G. Bari; F. Barreiro; D. Bartsch; M. Basile; O. Behnke; J. Behr; U. Behrens; L. Bellagamba; A. Bertolin; S. Bhadra; M. Bindi; C. Blohm; T. Bold; E. G. Boos; M. Borodin; K. Borras; D. Boscherini; D. Bot; S. K. Boutle; I. Brock; E. Brownson; R. Brugnera; N. Bruemmer; A. Bruni; G. Bruni; B. Brzozowska; P. J. Bussey; J. M. Butterworth; B. Bylsma; A. Caldwell; M. Capua; R. Carlin; C. D. Catterall; S. Chekanov; J. Chwastowski; J. Ciborowski; R. Ciesielski; L. Cifarelli; F. Cindolo; A. Contin; A. M. Cooper-Sarkar; N. Coppola; M. Corradi; F. Corriveau; M. Costa; G. D'Agostini; F. Dal Corso; J. de Favereau; J. del Peso; R. K. Dementiev; S. De Pasquale; M. Derrick; R. C. E. Devenish; D. Dobur; B. A. Dolgoshein; A. T. Doyle; V. Drugakov; L. S. Durkin; S. Dusini; Y. Eisenberg; P. F. Ermolov; A. Eskreys; S. Fang; S. Fazio; J. Ferrando; M. I. Ferrero; J. Figiel; M. Forrest; B. Foster; S. Fourletov; G. Gach; A. Galas; E. Gallo; A. Garfagnini; A. Geiser; I. Gialas; L. K. Gladilin; D. Gladkov; C. Glasman; O. Gogota; Yu. A. Golubkov; P. Goettlicher; I. Grabowska-Bold; J. Grebenyuk; I. Gregor; G. Grigorescu; G. Grzelak; C. Gwenlan; T. Haas; W. Hain; R. Hamatsu; J. C. Hart; H. Hartmann; G. Hartner; E. Hilger; D. Hochman; U. Holm; R. Hori; K. Horton; A. Huettmann; G. Iacobucci; Z. A. Ibrahim; Y. Iga; R. Ingbir; M. Ishitsuka; H.-P. Jakob; F. Januschek; M. Jimenez; T. W. Jones; M. Juengst; I. Kadenko; B. Kahle; B. Kamaluddin; S. Kananov; T. Kanno; U. Karshon; F. Karstens; I. I. Katkov; M. Kaur; P. Kaur; A. Keramidas; L. A. Khein; J. Y. Kim; D. Kisielewska; S. Kitamura; R. Klanner; U. Klein; E. Koffeman; D. Kollar; Ie. Korol; I. A. Korzhavina; A. Kotanski; U. Koetz; H. Kowalski; P. Kulinski; O. Kuprash; M. Kuze; V. A. Kuzmin; A. Lee; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; T. Y. Ling; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Loehr; E. Lohrmann; J. H. Loizides; K. R. Long; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; P. Luzniak; J. Maeda; S. Magill; I. Makarenko; J. Malka; R. Mankel; A. Margotti; G. Marini; J. F. Martin; A. Mastroberardino; T. Matsumoto; M. C. K. Mattingly; I.-A. Melzer-Pellmann; S. Miglioranzi; F. Mohamad Idris; V. Monaco; A. Montanari; J. D. Morris; B. Musgrave; K. Nagano; T. Namsoo; R. Nania; D. Nicholass; A. Nigro; Y. Ning; U. Noor; D. Notz; R. J. Nowak; A. E. Nuncio-Quiroz; B. Y. Oh; N. Okazaki; K. Oliver; K. Olkiewicz; Yu. Onishchuk; O. Ota; K. Papageorgiu; A. Parenti; E. Paul; J. M. Pawlak; B. Pawlik; P. G. Pelfer; A. Pellegrino; W. Perlanski; H. Perrey; K. Piotrzkowski; P. Plucinski; N. S. Pokrovskiy; A. Polini; A. S. Proskuryakov; M. Przybycien; A. Raval; D. D. Reeder; B. Reisert; Z. Ren; J. Repond; Y. D. Ri; A. Robertson; P. Roloff; E. Ron; I. Rubinsky; M. Ruspa; R. Sacchi; A. Salii; U. Samson; G. Sartorelli; A. A. Savin; D. H. Saxon; M. Schioppa; S. Schlenstedt; P. Schleper; W. B. Schmidke; U. Schneekloth; V. Schoenberg; T. Schoerner-Sadenius; J. Schwartz; F. Sciulli; L. M. Shcheglova; R. Shehzadi; S. Shimizu; I. Singh; I. O. Skillicorn; W. Slominski; W. H. Smith; V. Sola; A. Solano; D. Son; V. Sosnovtsev; A. Spiridonov; H. Stadie; L. Stanco; A. Stern; T. P. Stewart; A. Stifutkin; P. Stopa; S. Suchkov; G. Susinno; L. Suszycki; J. Sztuk; D. Szuba; J. Szuba; A. D. Tapper; E. Tassi; J. Terron; T. Theedt; H. Tiecke; K. Tokushuku; O. Tomalak; J. Tomaszewska; T. Tsurugai; M. Turcato; T. Tymieniecka; C. Uribe-Estrada; M. Vazquez; A. Verbytskyi; V. Viazlo; N. N. Vlasov; O. Volynets; R. Walczak; W. A. T. Wan Abdullah; J. J. Whitmore; J. Whyte; L. Wiggers; M. Wing; M. Wlasenko; G. Wolf; H. Wolfe; K. Wrona; A. G. Yagues-Molina; S. Yamada; Y. Yamazaki; R. Yoshida; C. Youngman; A. F. Zarnecki; L. Zawiejski; O. Zenaiev; W. Zeuner; B. O. Zhautykov; N. Zhmak; C. Zhou; A. Zichichi; M. Zolko; D. S. Zotkin; Z. Zulkapli

2010-01-01

54

ZEUS-2: a second generation submillimeter grating spectrometer for exploring distant galaxies  

NASA Astrophysics Data System (ADS)

ZEUS-2, the second generation (z)Redshift and Early Universe Spectrometer, like its predecessor is a moderate resolution (R~1000) long-slit, echelle grating spectrometer optimized for the detection of faint, broad lines from distant galaxies. It is designed for studying star-formation across cosmic time. ZEUS-2 employs three TES bolometer arrays (555 pixels total) to deliver simultaneous, multi-beam spectra in up to 4 submillimeter windows. The NIST Boulder-built arrays operate at ~100mK and are readout via SQUID multiplexers and the Multi-Channel Electronics from the University of British Columbia. The instrument is cooled via a pulse-tube cooler and two-stage ADR. Various filter configurations give ZEUS-2 access to 7 different telluric windows from 200 to 850 micron enabling the simultaneous mapping of lines from extended sources or the simultaneous detection of the 158 micron [CII] line and the [NII] 122 or 205 micron lines from z = 1-2 galaxies. ZEUS-2 is designed for use on the CSO, APEX and possibly JCMT.

Ferkinhoff, Carl; Nikola, Thomas; Parshley, Stephen C.; Stacey, Gordon J.; Irwin, Kent D.; Cho, Hsiao-Mei; Halpern, Mark

2010-07-01

55

Erosion, transport and deposition along the South-Central Chilean margin: the detrital apatite fission track perspective  

Microsoft Academic Search

Detrital fission track analysis has become a powerful tool for the study of sediment provenance and exhumation of orogens. Many studies focus on zones of continental collision with no or little volcanic activity, but there are less examples from active arc-trench systems. This type of orogen has a strong magmatic signature, and upper plate tectonothermal histories that are distinct from

B. Heberer; J. H. Behrmann; M. Rahn

2009-01-01

56

Apatite fission track thermochronometry from central Alberta: Implications for the thermal history of the Western Canada Sedimentary Basin  

NASA Astrophysics Data System (ADS)

Apatite separated from 47 Cretaceous and Tertiary drill core and surface samples from the foreland basin strata of the Western Canada Sedimentary Basin (WCSB) have been analyzed for their apatite fission track (AFT) age and confined track length distribution. Thermal histories of the fission track data were then estimated using a constrained random search inversion technique based on the Durango apatite annealing model. Most importantly, this technique provides an estimate of the peak postdepositional temperature experienced by each sample with error bounds determined by the precision of the fission track data. Most apatite samples retain at least some tracks that formed prior to the time of maximum Cenozoic burial, assumed to be coincident with maximun temperature. Seven apatite samples were fully annealed during burial, during or following the Laramide Orogeny, and provide a minimum age of 42 Ma for heating. Lower Cretaceous samples from near the deformation front were fully annealed and attained temperatures of at least 119-138 C during maximum bural. In contrast, stratigraphically equivalent smaples at the northeastern end of the transect near the Cold Lake heavy oil and tar sand deposits did not exceed 80 C. Paleogeothermal gradients calculated using bounded estimates of the peak temperatures experienced by the samples, together with maximum burial estimates from coal moisture studies, range from approximately 20 C/km near the deformation front to as high as 60 C/km near the cratonic edge of the basin. This variation has the same trend as present geothermal gradients, which range from approximately 30 C/km to 45 C/km, but indicates a greater constrast at the end of the Laramide. The results are consistent with the concept of heat transport by basinal scale fluid flow.

Ravenhurst, Casey E.; Willett, Sean D.; Donelick, Raymond A.; Beaumont, Christopher

1994-10-01

57

Which cue to 'want'? Opioid stimulation of central amygdala makes goal-trackers show stronger goal-tracking, just as sign-trackers show stronger sign-tracking  

PubMed Central

Pavlovian cues that have been paired with reward can gain incentive salience. Drug addicts find drug cues motivationally attractive and binge eaters are attracted by food cues. But the level of incentive salience elicited by a cue re-encounter still varies across time and brain states. In an animal model, cues become attractive and ‘wanted’ in an ‘autoshaping’ paradigm, where different targets of incentive salience emerge for different individuals. Some individuals (sign-trackers) find a predictive discrete cue attractive while others find a reward contiguous and goal cue more attractive (location where reward arrives: goal-trackers). Here we assessed whether central amygdala mu opioid receptor stimulation enhances the phasic incentive salience of the goal-cue for goal-trackers during moments of predictive cue presence (expressed in both approach and consummatory behaviors to goal cue), just as it enhances the attractiveness of the predictive cue target for sign-trackers. Using detailed video analysis we measured the approaches, nibbles, sniffs, and bites directed at their preferred target for both sign-trackers and goal-trackers. We report that DAMGO microinjections in central amygdala made goal-trackers, like sign-trackers, show phasic increases in appetitive nibbles and sniffs directed at the goal-cue expressed selectively whenever the predictive cue was present. This indicates enhancement of incentive salience attributed by both goal trackers and sign-trackers, but attributed in different directions: each to their own target cue. For both phenotypes, amygdala opioid stimulation makes the individual’s prepotent cue into a stronger motivational magnet at phasic moments triggered by a CS that predicts the reward UCS.

DiFeliceantonio, Alexandra G.; Berridge, Kent C.

2012-01-01

58

ZEUS2D: A Radiation Magnetohydrodynamics Code for Astrophysical Flows in Two Space Dimensions. II. The Magnetohydrodynamic Algorithms and Tests  

Microsoft Academic Search

In this, the third of a series of three papers, we conclude a detailed description ofZEUS-2D, a numerical code for the simulation of fluid dynamical flows in astrophysicsincluding a self-consistent treatment of the effects of magnetic fields and radiationtransfer. In this paper, we describe the radiation hydrodynamical (RHD) algorithmsin ZEUS-2D.We develop a two-dimensional full transport algorithm to evolve the radiation

James M. Stone; Michael L. Norman

1992-01-01

59

Fission track and fault kinematics analyses for new insight into the Late Cenozoic tectonic regime changes in West-Central Sulawesi (Indonesia)  

NASA Astrophysics Data System (ADS)

The left-lateral strike-slip Central Sulawesi Fault System (CSFS, composed of the NNW Palu Koro (PKF) and the ESE Matano faults) is located within the eastern Indonesian triple junction between the Pacific, Indo-Australian and Eurasian plates. Fault kinematic and fission-track analyses show that the Late Cenozoic central Sulawesi deformation results from three successive tectonic regimes: (1) A Late Miocene early Pliocene (5 Ma) WNW-trending shortening characterized by transpressional deformation along the PKF and compressional in the Poso area. This tectonics resulted from the collision between the Banggai Sula block with Sulawesi. It produced locally a transpressional regime as a consequence of the northward extrusion of the Central Sulawesi block limited by the PKF. (2) A Pliocene collapse tectonic regime associated with W-trending extension. Coeval with these events regional cooling and exhumation took place. (3) A Quaternary transtensional regime resulting from the combined effects of the Central Sulawesi block northward motion, and extension related to back-arc spreading behind the North Sulawesi subduction (Tomini Gulf).

Bellier, Olivier; Sébrier, Michel; Seward, Diane; Beaudouin, Thierry; Villeneuve, Michel; Putranto, Eka

2006-02-01

60

Efficiency of manual versus robotical (Zeus) assisted laparoscopic surgery in the performance of standardizedtasks  

Microsoft Academic Search

  Background: The objective of this study was to compare the efficiency of manual and robotically assisted laparoscopic surgery.\\u000a Methods: To evaluate the surgical efficiency in a set of basic endoscopic movements, 20 medical students without any surgical\\u000a experience were selected to perform at random a set of laparoscopic tasks either manually or robotic assisted (Zeus). This\\u000a task consisted of dropping

D. Nio; W. A. Bemelman; K. T. Boer; M. S. Dunker; D. J. Gouma; T. M. Gulik

2002-01-01

61

Measurements of the proton structure function at ZEUS from the 1995 data  

Microsoft Academic Search

The proton structure functions F2 were measured at HERA from 1993 and 1994 data in the kinematic range of 1.5ZEUS detector during 94\\/95 shutdown period resulted in a significant increase in kinematic coverage at very low x and Q2. Analyses

Jiatai Wu

1997-01-01

62

The experimental search for CHARM pentaquarks in the ZEUS detector at HERA  

SciTech Connect

Using the full 1996 - 2000 ZEUS data at HERA (121 pb-1) we have searched for the {theta}{sub c}{sup 0}(3100) pentaquark in the photoproduction and DIS regime. The search has yielded negative results. The 95% C.L. upper limits on the visible rate R({theta}{sub c}{sup 0} {yields} D{sup *}p/D{sup *}) is 0.23% (0.35% for DIS)

Eisenberg, Yehuda [Weizmann Institute of Science, Rehovot (Israel)

2005-10-06

63

Measurement of beauty production in DIS and extraction at ZEUS  

Microsoft Academic Search

Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been\\u000a measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb?1. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of\\u000a the muon relative to

H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; P. Antonioli; A. Antonov; M. Arneodo; V. Aushev; Y. Aushev; O. Bachynska; A. Bamberger; A. N. Barakbaev; G. Barbagli; G. Bari; F. Barreiro; D. Bartsch; M. Basile; O. Behnke; J. Behr; U. Behrens; L. Bellagamba; A. Bertolin; S. Bhadra; M. Bindi; C. Blohm; T. Bo?d; E. G. Boos; M. Borodin; K. Borras; D. Boscherini; D. Bot; S. K. Boutle; I. Brock; E. Brownson; R. Brugnera; N. Brümmer; A. Bruni; G. Bruni; B. Brzozowska; P. J. Bussey; J. M. Butterworth; B. Bylsma; A. Caldwell; M. Capua; R. Carlin; C. D. Catterall; S. Chekanov; J. Chwastowski; J. Ciborowski; R. Ciesielski; L. Cifarelli; F. Cindolo; A. Contin; A. M. Cooper-Sarkar; N. Coppola; M. Corradi; F. Corriveau; M. Costa; G. D’Agostini; J. de Favereau; R. K. Dementiev; S. De Pasquale; M. Derrick; R. C. E. Devenish; D. Dobur; B. A. Dolgoshein; A. T. Doyle; V. Drugakov; L. S. Durkin; S. Dusini; Y. Eisenberg; P. F. Ermolov; A. Eskreys; S. Fang; S. Fazio; J. Ferrando; M. I. Ferrero; J. Figiel; M. Forrest; B. Foster; S. Fourletov; G. Gach; A. Galas; E. Gallo; A. Garfagnini; A. Geiser; I. Gialas; L. K. Gladilin; D. Gladkov; C. Glasman; O. Gogota; Yu. A. Golubkov; P. Göttlicher; I. Grabowska-Bo?d; J. Grebenyuk; I. Gregor; G. Grigorescu; G. Grzelak; C. Gwenlan; T. Haas; W. Hain; R. Hamatsu; J. C. Hart; H. Hartmann; G. Hartner; E. Hilger; D. Hochman; U. Holm; R. Hori; K. Horton; A. Hüttmann; G. Iacobucci; Z. A. Ibrahim; Y. Iga; R. Ingbir; M. Ishitsuka; H.-P. Jakob; F. Januschek; M. Jimenez; T. W. Jones; M. Jüngst; I. Kadenko; B. Kahle; B. Kamaluddin; S. Kananov; T. Kanno; U. Karshon; F. Karstens; I. I. Katkov; M. Kaur; P. Kaur; A. Keramidas; L. A. Khein; J. Y. Kim; D. Kisielewska; S. Kitamura; R. Klanner; U. Klein; E. Koffeman; D. Kollar; P. Kooijman; Ie. Korol; I. A. Korzhavina; A. Kota?ski; U. Kötz; H. Kowalski; P. Kulinski; O. Kuprash; M. Kuze; V. A. Kuzmin; A. Lee; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; T. Y. Ling; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Löhr; E. Lohrmann; J. H. Loizides; K. R. Long; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; P. ?u?niak; J. Maeda; S. Magill; I. Makarenko; J. Malka; R. Mankel; A. Margotti; G. Marini; J. F. Martin; A. Mastroberardino; T. Matsumoto; M. C. K. Mattingly; I.-A. Melzer-Pellmann; S. Miglioranzi; F. Mohamad Idris; V. Monaco; A. Montanari; J. D. Morris; B. Musgrave; K. Nagano; T. Namsoo; R. Nania; D. Nicholass; A. Nigro; Y. Ning; U. Noor; D. Notz; R. J. Nowak; A. E. Nuncio-Quiroz; B. Y. Oh; N. Okazaki; K. Oliver; K. Olkiewicz; Yu. Onishchuk; O. Ota; K. Papageorgiu; A. Parenti; E. Paul; J. M. Pawlak; B. Pawlik; P. G. Pelfer; A. Pellegrino; W. Perlanski; H. Perrey; K. Piotrzkowski; P. Plucinski; N. S. Pokrovskiy; A. Polini; A. S. Proskuryakov; M. Przybycie?; A. Raval; D. D. Reeder; B. Reisert; Z. Ren; J. Repond; Y. D. Ri; A. Robertson; P. Roloff; E. Ron; I. Rubinsky; M. Ruspa; R. Sacchi; A. Salii; U. Samson; G. Sartorelli; A. A. Savin; D. H. Saxon; M. Schioppa; S. Schlenstedt; P. Schleper; W. B. Schmidke; U. Schneekloth; V. Schönberg; T. Schörner-Sadenius; J. Schwartz; F. Sciulli; L. M. Shcheglova; R. Shehzadi; S. Shimizu; I. Singh; I. O. Skillicorn; W. S?omi?ski; W. H. Smith; V. Sola; A. Solano; D. Son; V. Sosnovtsev; A. Spiridonov; H. Stadie; L. Stanco; A. Stern; T. P. Stewart; A. Stifutkin; P. Stopa; S. Suchkov; G. Susinno; L. Suszycki; J. Sztuk; D. Szuba; J. Szuba; A. D. Tapper; E. Tassi; J. Terrón; T. Theedt; H. Tiecke; K. Tokushuku; O. Tomalak; J. Tomaszewska; T. Tsurugai; M. Turcato; T. Tymieniecka; C. Uribe-Estrada; M. Vázquez; A. Verbytskyi; V. Viazlo; N. N. Vlasov; O. Volynets; R. Walczak; W. A. T. Wan Abdullah; J. J. Whitmore; J. Whyte; L. Wiggers; M. Wing; M. Wlasenko; G. Wolf; H. Wolfe; K. Wrona; A. G. Yagües-Molina; S. Yamada; Y. Yamazaki; R. Yoshida; C. Youngman; A. F. ?arnecki; L. Zawiejski; O. Zenaiev; W. Zeuner; B. O. Zhautykov; N. Zhmak; C. Zhou; A. Zichichi; M. Zolko; D. S. Zotkin; Z. Zulkapli

2010-01-01

64

662. The Tracking of Exogenous Cells in the Injured Central Nervous System: Viral Vector Labeling Versus an Intrinsic Genetic Marker  

Microsoft Academic Search

Transplantation of exogenous cells into the injured central nervous system and subsequent examination of how these cells survive, integrate and perform physiological functions within the host environment requires that the cells be clearly identifiable from host cells. As many of the cells used for transplantation studies are derived from cultures of cells indistinguishable from the host using immunochemical approaches, numerous

Bas Blits; Brandon M. Kitay; Andre R. Sanchez; Christian M. Andrade; Damien D. Pearse

2005-01-01

65

Phanerozoic upper crustal tectono-thermal development of basement rocks from central Madagascar: An integrated fission-track and structural study  

NASA Astrophysics Data System (ADS)

An integrated study of fission-track (FT) dating and structural geology revealed a complex tectono-thermal history preserved in basement rocks of central Madagascar since the amalgamation of Gondwana at the end of the Cambrian. A detailed study of five domains argues for several cooling steps with associated brittle deformations during the separation of Madagascar. Titanite and apatite FT ages range between 483 Ma and 266 Ma and between 460 Ma and 79 Ma, respectively. The titanite FT data indicate that the final cooling after the latest metamorphic overprint was terminated at c. 500 Ma (FC1). A 150 Myr phase of minor cooling (SC2), possibly related to a phase of tectonic quiescence and isostatic compensation, followed episode FC1. Between the Carboniferous and Early Jurassic, when an intracontinental rift developed between East Africa and Madagascar, complex brittle deformation effected the western margin of Madagascar and led to differential cooling of small basement blocks (FC3 FC5). During this period, ductile structural trends were reactivated at the western basement margin and in the centre of the island. A Late Cretaceous thermal event (T1) affected apatite FT data of samples from western central and the eastern margin of Madagascar. These ages are related to the Madagascar India/Seychelles break-up, whereby the thermal penetration along the eastern coast was restricted to the west by the Angavo shear zone (AGSZ). The Cretaceous evolution of the eastern margin was associated with minor erosion and was triggered by vertical displacements along brittle structures.

Emmel, B.; Jacobs, J.; Kastowski, M.; Graser, G.

2006-01-01

66

The GEANT-CALOR interface and benchmark calculations of ZEUS test calorimeters  

NASA Astrophysics Data System (ADS)

The simulation of large scale high energy physics experiments is based mainly on the GEANT package. In the current version 3.15 the simulation of hadronic interacting particles is based on GHEISHA or FLUKA. Both programs miss an accurate simulation of the interaction of low energetic neutrons (Ekin < 20 MeV) with the materials of the detector. The CALOR89 program package contains a low energetic neutron code. An interface between the CALOR program parts and the GEANT package has been developed. A comparison of simulations with ZEUS test beam measurements shows a good agreement of the energy resolution and the e/h-ratio.

Zeitnitz, C.; Gabriel, T. A.

1994-09-01

67

ZEUS results on the measurement and phenomenology of $F_2$ at low x and low $Q^2$  

Microsoft Academic Search

Measurements of the proton structure function $F_2$ for $0.6 < Q^2 < 17\\u000a{GeV}^2$ and $1.2 \\\\times 10^{-5} < x <1.9 \\\\times 10^{-3}$ from ZEUS 1995\\u000ashifted vertex data are presented. From ZEUS $F_2$ data the slopes $dF_2\\/d\\\\ln\\u000aQ^2$ at fixed $x$ and $d\\\\ln F_2\\/d\\\\ln(1\\/x)$ for $x < 0.01$ at fixed $Q^2$ are\\u000aderived. For the latter E665 data are

1999-01-01

68

Tracking atmospheric and riverine terrigenous supplies variability during the last glacial and the Holocene in central Mediterranean  

NASA Astrophysics Data System (ADS)

The objectives were to retrace the eolian and fluvial terrigenous supplies in a sediment core from the Sicilian-Tunisian Strait by coupling mineralogical, grain-size and geochemical approaches, in order to get informations on the atmospheric versus riverine contributions to sedimentation on the southern side of central Mediterranean since the last glacial. The eolian supply is dominant over the whole interval, excepted during the sapropel S1 when riverine contribution apparently became significant, and particles provenance has been modified since Last Glacial. Saharan contribution increased during the Bølling-Allerød, evidencing the persistence of aridity over North Africa although the northern Mediterranean already experienced moister and warmer conditions. The Younger Dryas is marked by proximal dust inputs highlighting intense regional eolian activity. A southward migration of dust provenance toward Sahel occurred at the onset of the Holocene, likely resulting from a southward position of the Inter Tropical Convergence Zone, probably associated with a large-scale atmospheric reorganization. Finally, a peculiar high terrigenous flux associated with drastic modifications of the mineralogical and geochemical sediment signature occurred during the sapropel S1, suggesting the propagation of fine-particles derived from major floodings of the Nile River - resulting from enhanced rainfall on northeastern Africa - and their transportation across the Sicilian-Tunisian Strait by intermediate water-masses.

Bout-Roumazeilles, V.; Combourieu-Nebout, N.; Desprat, S.; Siani, G.; Turon, J.-L.

2012-07-01

69

New apatite fission-track data reflecting the landscape evolution using the example of the southeastern passive continental margin in Central Brazil  

NASA Astrophysics Data System (ADS)

Low-temperature thermochronolgy like AFT yield a well established tool to understand and reconstruct the rift to post-rift evolution of the passive continental margin in Brazil. The aim of the study is to quantify the temperature, exhumation, uplift, and long-term dynamic evolution of the topography of the southeastern passive continental margin in the states of Paraná and Santa Catarina (Central Brazil) along different transects. The working area shows the active evolution since the Early Cretaceous with altitudes up to 1400 m a.s.l and partly deep incised valleys. The first transect crosses the Ponta Grossa Arch with Devonian to Jurassic sediments in an NE-SW direction from the escarpment (Escarpa Devoniana) of the Serra Mantiquera in the NE to the escarpment in the SE built up of the overlying Early Cretaceous flood basalts of the Serra Urtigueira. The second transect drops down perpendicular to the coast where the eastern escarpment of the Serra Geral (up to 1400 m a.s.l) reaches nearly the coast. The highlands consist of Cretaceous flood basalts whereas the coastal lowlands constist of Precambrian metamorphic and intrusive rocks. Previous apatite fission-track data of the states of Parana and Santa Catarina provide ages between 144 (5) Ma (Gallgher et al., 1994) and 25 (1.8) Ma (Franco-Magalhaes, A.O.B., subm.) and show different post-rift reactivation from the Cretaceous to the Paleogene. But none of the studies indicate a clear relationship between age distribution and topography or age distribution and stratigraphic age. This study is based on samples taken along the transects within the working area. The results will provide new insigths into the evolution of the southeastern passive continental margin in Central Brazil concerning the thermal, exhumation, and uplift history of the Brazilian passive continental margin.

Karl, Markus; Glasmacher, Ulrich A.; Hackspacher, Peter C.; Franco-Magalhaes, Ana O. B.

2010-05-01

70

Q 2-evolution of parton densities at small x values. Combined H1 and ZEUS F2 data  

NASA Astrophysics Data System (ADS)

We use the Bessel-inspired behavior of the structure function F 2 at small x, obtained for a flat initial condition in the DGLAP evolution equations, with "frozen" and analytic modifications of the strong coupling constant to study precise combined H1 and ZEUS data for the structure function F 2 published recently.

Kotikov, A. V.; Shaikhatdenov, B. G.

2013-05-01

71

Use of the voice-controlled and computer-assisted surgical system zeus for endoscopic coronary artery bypass grafting  

Microsoft Academic Search

Objective: With the aim of performing a completely endoscopic coronary bypass anastomosis, we have undertaken an experimental and clinical study using robotic instrumentation and voice-controlled camera guidance. Methods: The ZEUS Robotic Surgical System (Computer Motion Inc, Goleta, Calif) consists of three interactive robotic arms and a control unit, allowing the surgeon to move the instrument arms in a scaled down

Hermann Reichenspurner; Ralph J. Damiano; Michael Mack; Dieter H. Boehm; Helmut Gulbins; Christian Detter; Bruno Meiser; Reinhard Ellgass; Bruno Reichart

1999-01-01

72

Measurement of beauty production in DIS and [InlineEquation not available: see fulltext.] extraction at ZEUS  

Microsoft Academic Search

Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb-1. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative

H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; P. Antonioli; A. Antonov; M. Arneodo; V. Aushev; Y. Aushev; O. Bachynska; A. Bamberger; A. N. Barakbaev; G. Barbagli; G. Bari; F. Barreiro; D. Bartsch; M. Basile; O. Behnke; J. Behr; U. Behrens; L. Bellagamba; A. Bertolin; S. Bhadra; M. Bindi; C. Blohm; T. Bold; E. G. Boos; M. Borodin; K. Borras; D. Boscherini; D. Bot; S. K. Boutle; I. Brock; E. Brownson; R. Brugnera; N. Brümmer; A. Bruni; G. Bruni; B. Brzozowska; P. J. Bussey; J. M. Butterworth; B. Bylsma; A. Caldwell; M. Capua; R. Carlin; C. D. Catterall; S. Chekanov; J. Chwastowski; J. Ciborowski; R. Ciesielski; L. Cifarelli; F. Cindolo; A. Contin; A. M. Cooper-Sarkar; N. Coppola; M. Corradi; F. Corriveau; M. Costa; G. D'Agostini; F. Dal Corso; J. de Favereau; J. Del Peso; R. K. Dementiev; S. de Pasquale; M. Derrick; R. C. E. Devenish; D. Dobur; B. A. Dolgoshein; A. T. Doyle; V. Drugakov; L. S. Durkin; S. Dusini; Y. Eisenberg; P. F. Ermolov; A. Eskreys; S. Fang; S. Fazio; J. Ferrando; M. I. Ferrero; J. Figiel; M. Forrest; B. Foster; S. Fourletov; G. Gach; A. Galas; E. Gallo; A. Garfagnini; A. Geiser; I. Gialas; L. K. Gladilin; D. Gladkov; C. Glasman; O. Gogota; Yu. A. Golubkov; P. Göttlicher; I. Grabowska-Bold; J. Grebenyuk; I. Gregor; G. Grigorescu; G. Grzelak; C. Gwenlan; T. Haas; W. Hain; R. Hamatsu; J. C. Hart; H. Hartmann; G. Hartner; E. Hilger; D. Hochman; U. Holm; R. Hori; K. Horton; A. Hüttmann; G. Iacobucci; Z. A. Ibrahim; Y. Iga; R. Ingbir; M. Ishitsuka; H.-P. Jakob; F. Januschek; M. Jimenez; T. W. Jones; M. Jüngst; I. Kadenko; B. Kahle; B. Kamaluddin; S. Kananov; T. Kanno; U. Karshon; F. Karstens; I. I. Katkov; M. Kaur; P. Kaur; A. Keramidas; L. A. Khein; J. Y. Kim; D. Kisielewska; S. Kitamura; R. Klanner; U. Klein; E. Koffeman; D. Kollar; P. Kooijman; Ie. Korol; I. A. Korzhavina; A. Kotanski; U. Kötz; H. Kowalski; P. Kulinski; O. Kuprash; M. Kuze; V. A. Kuzmin; A. Lee; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; T. Y. Ling; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Löhr; E. Lohrmann; J. H. Loizides; K. R. Long; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; P. Luzniak; J. Maeda; S. Magill; I. Makarenko; J. Malka; R. Mankel; A. Margotti; G. Marini; J. F. Martin; A. Mastroberardino; T. Matsumoto; M. C. K. Mattingly; I.-A. Melzer-Pellmann; S. Miglioranzi; F. Mohamad Idris; V. Monaco; A. Montanari; J. D. Morris; B. Musgrave; K. Nagano; T. Namsoo; R. Nania; D. Nicholass; A. Nigro; Y. Ning; U. Noor; D. Notz; R. J. Nowak; A. E. Nuncio-Quiroz; B. Y. Oh; N. Okazaki; K. Oliver; K. Olkiewicz; Yu. Onishchuk; O. Ota; K. Papageorgiu; A. Parenti; E. Paul; J. M. Pawlak; B. Pawlik; P. G. Pelfer; A. Pellegrino; W. Perlanski; H. Perrey; K. Piotrzkowski; P. Plucinski; N. S. Pokrovskiy; A. Polini; A. S. Proskuryakov; M. Przybycien; A. Raval; D. D. Reeder; B. Reisert; Z. Ren; J. Repond; Y. D. Ri; A. Robertson; P. Roloff; E. Ron; I. Rubinsky; M. Ruspa; R. Sacchi; A. Salii; U. Samson; G. Sartorelli; A. A. Savin; D. H. Saxon; M. Schioppa; S. Schlenstedt; P. Schleper; W. B. Schmidke; U. Schneekloth; V. Schönberg; T. Schörner-Sadenius; J. Schwartz; F. Sciulli; L. M. Shcheglova; R. Shehzadi; S. Shimizu; I. Singh; I. O. Skillicorn; W. Slominski; W. H. Smith; V. Sola; A. Solano; D. Son; V. Sosnovtsev; A. Spiridonov; H. Stadie; L. Stanco; A. Stern; T. P. Stewart; A. Stifutkin; P. Stopa; S. Suchkov; G. Susinno; L. Suszycki; J. Sztuk; D. Szuba; J. Szuba; A. D. Tapper; E. Tassi; J. Terrón; T. Theedt; H. Tiecke; K. Tokushuku; O. Tomalak; J. Tomaszewska; T. Tsurugai; M. Turcato; T. Tymieniecka; C. Uribe-Estrada; M. Vázquez; A. Verbytskyi; V. Viazlo; N. N. Vlasov; O. Volynets; R. Walczak; W. A. T. Wan Abdullah; J. J. Whitmore; J. Whyte; L. Wiggers; M. Wing; M. Wlasenko; G. Wolf; H. Wolfe; K. Wrona; A. G. Yagües-Molina; S. Yamada; Y. Yamazaki; R. Yoshida; C. Youngman; A. F. Zarnecki; L. Zawiejski; O. Zenaiev; W. Zeuner; B. O. Zhautykov; N. Zhmak; C. Zhou; A. Zichichi; M. Zolko; D. S. Zotkin; Z. Zulkapli

2010-01-01

73

Plio-Pleistocene exhumation of the Main Central Trust footwall based on new apatite fission track data (NW-Himalaya/India).  

NASA Astrophysics Data System (ADS)

The cause of Plio-Pleistocene apatite fission track (AFT) cooling ages in the footwall of the Miocene Main Central Trust (MCT) remains controversial. The Sutlej River (N32°/E78°) in the northwestern Indian Himalaya is part of one of the three largest drainages traversing the Himalaya. It has incised a deep gorge exposing the crystalline core of the orogen in a natural cross-section, which contains two extruded metamorphic crustal wedges: The High Himalayan Crystalline Sequence (HHCS) and the Lesser Himalayan Crystalline Sequence (LHCS). The HHCS was tectonically extruded between Early and Middle Miocene time by combined thrusting along the Main Central Thrust (MCT) with coeval extension along the Southern Tibetan Detachment System (STDS). The LHCS forms the footwall of the MCT and has been cooling very rapidly since the Late Miocene, as a consequence of the still ongoing extrusion. This process is controlled by thrusting along the Munsiari Thrust in the footwall and extension in the MCT hanging wall. Active tectonics is further indicated by seismicity, knickpoints in the river profile and hydrothermal circulation, probably linked to elevated near-surface geothermal gradients in the LHCS. New AFT cooling ages obtained from sub-vertical transects starting in the LHCS and crossing the Miocene MCT and STDS (perpendicular to the Sutlej-Valley) indicate fast Plio-Pleistocene cooling and exhumation of the LHCS and the lower parts of the HHCS. Along the Sutlej River, the LHCS and the lower part of the HHCS are characterized by very young ages between 1.5 +/- 0.4 and <1 +/- 0.4 (2? ) Ma at elevations of 1500-2000m asl. The AFT ages increase systematically with increasing age-elevation; the trend does not vary when crossing the MCT and STDS mylonitic zones, respectively. At elevations between 4400 to 4600 m asl the ages are between 2.8 +/- 0.6 and 3.7 +/- 1.2 (2? ). A mean Pliocene to Pleistocene exhumation rate in the central part of LHCS is estimated to be 1.3 +/- 0.7 mm/a and to be 1.0 +/- 0.4 mm/a of the lower part of the HHCS. Due to the inferred high exhumation rates topographic effects can be neglected. The AFT cooling ages across the MCT and the STDS indicate neither Quaternary thrusting along the MCT nor normal faulting along the STDS in the region of the Sutlej River.

Thiede, R. C.; Bookhagen, B.; Sobel, E.; Strecker, M. R.; Grasemann, B.; Janda, C.

2002-12-01

74

Network MFA tracking architectures  

NASA Astrophysics Data System (ADS)

This work presents some initial steps in the development of a decentralized network centric multiple frame assignment (MFA) class of architecture algorithms that affordably preserves the quality of a centralized architecture across a network of platforms while managing communication loading and achieving a consistent air picture on entities of interest for each platform. In particular, this work discussed four architectures, namely, Centralized, Network MFA Centralized, Network MFA on Local Data and Network Tracks, and Network MFA on All Data and Network Tracks and the results of extensive computations with the architectures.

Lu, Suihua; Poore, Aubrey P.; Suchomel, Brian J.

2001-11-01

75

Cenozoic tectonics in the Buruanga Peninsula, Panay Island, Central Philippines, as constrained by U-Pb, 40Ar/39Ar and fission track thermochronometers  

NASA Astrophysics Data System (ADS)

Buruanga Peninsula forms the westernmost part of Panay Island, Central Philippines and is a part of the Palawan Continental Terrane (PCT), which was formerly attached to south-eastern China. It acted as the leading edge of the continental fragment and collided with the Philippine Mobile Belt (PMB) followed by convergence beneath the latter. Dating of the collision is crucial for understanding the evolution of the archipelago. Samples collected from Buruanga Peninsula were dated using U-Pb, 40Ar/39Ar and fission track dating (FTD) techniques to constrain the timing of the tectonic events related to the collision of the PMB with the PCT. These techniques have enabled us to obtain ages over a range of closure temperatures from about 700 °C to about 110 °C. Paleoproterozoic and Permian zircon U-Pb ages from Saboncogon Formation emphasize derivation of the western part of Buruanga Peninsula from SE China; zircon and apatite fission track ages of 51 Ma and 16 Ma, respectively, constrain the exhumation of this formation. The age data suggest tectonic events at ~ 14 Ma, ~ 11-12 Ma and about 7-8 Ma following intrusive activity at about 18 Ma. Uplift and exhumation at ~ 14 Ma are thought to be the result of subduction of low-density crustal rocks, at 11 Ma to be the result of isostatic uplift as a consequence of crustal thickening and at ~ 8 Ma to be due to the isostatic re-equilibration of the sediments overlying the former suture. Hence, collision is constrained to have started at about 14-15 Ma and to have ended before 8 Ma. Multi-element patterns of the 18 Ma Patria-Diorite from Buruanga Peninsula show enrichment in LILE (Rb, Sr, and K) and LREE and depletion in HFSE elements (Ti, Nb, and Ta) similar to those from Luzon volcanics and the volcanic rocks of Negros Island. These arc-signatures indicate a subduction related environment for the emplacement of this intrusive body and show that the diorite belongs to the PMB. The age constraints of the present study neither support the concept of an Early Miocene collision nor the assumption of a Late Miocene collision, thus, have a significant bearing on the controversial issues regarding the evolution of the present day Philippine archipelago.

Walia, M.; Yang, T. F.; Knittel, U.; Liu, T.-K.; Lo, C.-H.; Chung, S.-L.; Teng, L. S.; Dimalanta, C. B.; Yumul, G. P.; Yuan, W. M.

2013-01-01

76

Analysis of the initial Zeus critical condition with MCNP and ENDF/B-VI  

SciTech Connect

The Zeus experiment was designed to test the adequacy of {sup 235}U cross sections in the intermediate-energy range. For its initial configuration, the core contains thin, circular platters of highly enriched uranium (HEU) separated by similar platters of graphite. The cylindrical core is reflected by copper pieces shaped to produce a parallelepiped. Zeus achieved initial criticality on April 26, with ten HEU platters and an axial loading that is almost symmetrical. The critical configuration had 4 cm of graphite above the top HEU platter, 4 cm of graphite below the bottom HEU platter, and 8 cm of graphite between all but two adjacent HEU platters. The fourth and fifth platters, counting from the bottom, were separated by 6.5 cm of graphite and 60 mils (0.1524 cm) of aluminum. The aluminum shim was required because Zeus currently has an operating limit of 10{cents} of excess reactivity. A schematic of this configuration is shown. This configuration actually was very slightly supercritical, with a period of {approximately}1,100 s. This period corresponds to {approximately}1{cents} of excess reactivity and therefore to a value of k{sub eff} between 1.0000 and 1.0001. For practical applications, therefore, the configuration can be considered to be exactly critical. A detailed MCNP model of the critical configuration was constructed, as were models for two slightly subcritical configurations. Prior to achieving criticality, measurements had been made for two very similar but slightly subcritical configurations. The first subcritical configuration had 8 cm of graphite between all adjacent HEU platters, while the second had only 7 cm between the fourth and fifth platters (but 8 cm between all others). Calculations were performed with MCNP4XS, a version of the MCNP Monte Carlo code that is intermediate between MCNP4B and the forthcoming MCNP4C, and a cross-section library derived from release 4 of ENDF/B-VI. These results show the incremental increase in reactivity from one configuration to the next, and the reactivity changes correspond quite well with the estimated subcritical margins. However, there is a bias of {approximately}0.01 {Delta}k in the calculated values for k{sub eff}.

Mosteller, R.D.; Jaegers, P.J.

1999-07-01

77

Tectonic and thermal history of the western Serrania del Interior foreland fold and thrust belt and Guarico Basin, north central Venezuela: Implications of new apatite fission track analysis and seismic interpretation  

Microsoft Academic Search

Structural analysis, interpretation of seismic reflection lines, and apatite fission-track analysis in the Western Serrania del Interior fold and thrust belt and in the Guarico basin of north-central Venezuela indicate that the area underwent Mesozoic and Tertiary-to-Recent deformation. Mesozoic deformation, related to the breakup of Pangea, resulted in the formation of the Espino graben in the southernmost portion of the

Jaime Gonzalo Perez de Armas

2005-01-01

78

Measurement of D ± production in deep inelastic ep scattering with the ZEUS detector at HERA  

NASA Astrophysics Data System (ADS)

Charm production in deep inelastic ep scattering was measured with the ZEUS detector using an integrated luminosity of 354 pb-1. Charm quarks were identified by reconstructing D ± mesons in the D ± ? K ??±?± decay channel. Lifetime information was used to reduce combinatorial background substantially. Differential cross sections were measured in the kinematic region 5 < Q 2 < 1000 GeV2, 0 .02 < y < 0 .7, 1 .5 < p T ( D ±) < 15 GeV and | ?( D ±)| < 1 .6, where Q 2 is the photon virtuality, y is the inelasticity, and p T ( D ±) and ?( D ±) are the transverse momentum and the pseudorapidity of the D ± meson, respectively. Next-to-leading-order QCD predictions are compared to the data. The charm contribution, F_2^{{coverline{c}}} , to the proton structure-function F 2 was extracted.

Abramowicz, H.; Abt, I.; Adamczyk, L.; Adamus, M.; Aggarwal, R.; Antonelli, S.; Antonioli, P.; Antonov, A.; Arneodo, M.; Arslan, O.; Aushev, V.; Aushev, Y.; Bachynska, O.; Bamberger, A.; Barakbaev, A. N.; Barbagli, G.; Bari, G.; Barreiro, F.; Bartosik, N.; Bartsch, D.; Basile, M.; Behnke, O.; Behr, J.; Behrens, U.; Bellagamba, L.; Bertolin, A.; Bhadra, S.; Bindi, M.; Blohm, C.; Bokhonov, V.; Bold, T.; Boos, E. G.; Borras, K.; Boscherini, D.; Bot, D.; Brock, I.; Brownson, E.; Brugnera, R.; Brümmer, N.; Bruni, A.; Bruni, G.; Brzozowska, B.; Bussey, P. J.; Bylsma, B.; Caldwell, A.; Capua, M.; Carlin, R.; Catterall, C. D.; Chekanov, S.; Chwastowski, J.; Ciborowski, J.; Ciesielski, R.; Cifarelli, L.; Cindolo, F.; Contin, A.; Cooper-Sarkar, A. M.; Coppola, N.; Corradi, M.; Corriveau, F.; Costa, M.; D'Agostini, G.; Corso, F. Dal; del Peso, J.; Dementiev, R. K.; De Pasquale, S.; Derrick, M.; Devenish, R. C. E.; Dobur, D.; Dolgoshein, B. A.; Dolinska, G.; Doyle, A. T.; Drugakov, V.; Durkin, L. S.; Dusini, S.; Eisenberg, Y.; Ermolov, P. F.; Eskreys, A.; Fang, S.; Fazio, S.; Ferrando, J.; Ferrero, M. I.; Figiel, J.; Foster, B.; Gach, G.; Galas, A.; Gallo, E.; Garfagnini, A.; Geiser, A.; Gialas, I.; Gizhko, A.; Gladilin, L. K.; Gladkov, D.; Glasman, C.; Gogota, O.; Golubkov, Yu. A.; Göttlicher, P.; Grabowska-Bold, I.; Grebenyuk, J.; Gregor, I.; Grigorescu, G.; Grzelak, G.; Gueta, O.; Guzik, M.; Gwenlan, C.; Haas, T.; Hain, W.; Hamatsu, R.; Hart, J. C.; Hartmann, H.; Hartner, G.; Hilger, E.; Hochman, D.; Hori, R.; Hüttmann, A.; Ibrahim, Z. A.; Iga, Y.; Ingbir, R.; Ishitsuka, M.; Iudin, A.; Jakob, H.-P.; Januschek, F.; Jones, T. W.; Jüngst, M.; Kadenko, I.; Kahle, B.; Kananov, S.; Kanno, T.; Karshon, U.; Karstens, F.; Katkov, I. I.; Kaur, M.; Kaur, P.; Keramidas, A.; Khein, L. A.; Kim, J. Y.; Kisielewska, D.; Kitamura, S.; Klanner, R.; Klein, U.; Koffeman, E.; Kondrashova, N.; Kononenko, O.; Kooijman, P.; Korol, Ie.; Korzhavina, I. A.; Kotanski, A.; Kötz, U.; Kovalchuk, N.; Kowalski, H.; Kuprash, O.; Kuze, M.; Lee, A.; Levchenko, B. B.; Levy, A.; Libov, V.; Limentani, S.; Ling, T. Y.; Lisovyi, M.; Lobodzinska, E.; Lohmann, W.; Löhr, B.; Lohrmann, E.; Long, K. R.; Longhin, A.; Lontkovskyi, D.; Lukina, O. Yu.; Maeda, J.; Magill, S.; Makarenko, I.; Malka, J.; Mankel, R.; Margotti, A.; Marini, G.; Martin, J. F.; Mastroberardino, A.; Mattingly, M. C. K.; Melzer-Pellmann, I.-A.; Mergelmeyer, S.; Miglioranzi, S.; Idris, F. Mohamad; Monaco, V.; Montanari, A.; Morris, J. D.; Mujkic, K.; Musgrave, B.; Nagano, K.; Namsoo, T.; Nania, R.; Nigro, A.; Ning, Y.; Nobe, T.; Notz, D.; Nowak, R. J.; Nuncio-Quiroz, A. E.; Oh, B. Y.; Okazaki, N.; Olkiewicz, K.; Onishchuk, Yu.; Papageorgiu, K.; Parenti, A.; Paul, E.; Pawlak, J. M.; Pawlik, B.; Pelfer, P. G.; Pellegrino, A.; Perlanski, W.; Perrey, H.; Piotrzkowski, K.; Plucinski, P.; Pokrovskiy, N. S.; Polini, A.; Proskuryakov, A. S.; Przybycien, M.; Raval, A.; Reeder, D. D.; Reisert, B.; Ren, Z.; Repond, J.; Ri, Y. D.; Robertson, A.; Roloff, P.; Rubinsky, I.; Ruspa, M.; Sacchi, R.; Samson, U.; Sartorelli, G.; Savin, A. A.; Saxon, D. H.; Schioppa, M.; Schlenstedt, S.; Schleper, P.; Schmidke, W. B.; Schneekloth, U.; Schönberg, V.; Schörner-Sadenius, T.; Schwartz, J.; Sciulli, F.; Shcheglova, L. M.; Shehzadi, R.; Shimizu, S.; Singh, I.; Skillicorn, I. O.; Slominski, W.; Smith, W. H.; Sola, V.; Solano, A.; Son, D.; Sosnovtsev, V.; Spiridonov, A.; Stadie, H.; Stanco, L.; Stefaniuk, N.; Stern, A.; Stewart, T. P.; Stifutkin, A.; Stopa, P.; Suchkov, S.; Susinno, G.; Suszycki, L.; Sztuk-Dambietz, J.; Szuba, D.; Szuba, J.; Tapper, A. D.; Tassi, E.; Terrón, J.; Theedt, T.; Tiecke, H.; Tokushuku, K.; Tomaszewska, J.; Trofymov, A.; Trusov, V.; Tsurugai, T.; Turcato, M.; Turkot, O.; Tymieniecka, T.; Vázquez, M.; Verbytskyi, A.; Viazlo, O.; Vlasov, N. N.; Walczak, R.; Abdullah, W. A. T. Wan; Whitmore, J. J.; Wichmann, K.; Wiggers, L.; Wing, M.; Wlasenko, M.; Wolf, G.; Wolfe, H.; Wrona, K.; Yagües-Molina, A. G.; Yamada, S.; Yamazaki, Y.; Yoshida, R.; Youngman, C.; Zakharchuk, N.; ?arnecki, A. F.; Zawiejski, L.; Zenaiev, O.; Zeuner, W.; Zhautykov, B. O.; Zhmak, N.; Zichichi, A.; Zolkapli, Z.; Zotkin, D. S.

2013-05-01

79

Calibration of the ZEUS Barrel Calorimeter in a Test Beam and a Direct Measurement of the J\\/psi Leptonic Branching Fraction  

Microsoft Academic Search

The ZEUS detector at the DESY e-p collider HERA has started collecting data. It contains a state-of-the -art fully compensating high resolution Uranium-scintillator calorimeter. The American part of the ZEUS collaboration was responsible for the construction of the 32 modules of the Barrel CALorimeter (BCAL) and the readout electronics for the complete calorimeter. A test beam experiment E790 was set

Min-Zu. Wang; Min-Zu

1993-01-01

80

Late Mesozoic and Cenozoic thermotectonic evolution of the central Brooks Range and adjacent North Slope foreland basin, Alaska: Including fission track results from the Trans-Alaska Crustal Transect (TACT)  

USGS Publications Warehouse

Apatite fission track data are used to evaluate the thermal and tectonic history of the central Brooks Range and the North Slope foreland basin in northern Alaska along the northern leg of the Trans-Alaska Crustal Transect (TACT). Fission track analyses of the detrital apatite grains in most sedimentary units resolve the timing of structures and denudation within the Brooks Range, ranging in scale from the entire mountain range to relatively small-scale folds and faults. Interpretation of the results indicates that rocks exposed within the central Brooks Range cooled rapidly from paleotemperatures 110?? to 50??C during discrete episodes at ???100??5 Ma, ???60??4 Ma, and ???24??3 Ma, probably in response to kilometer-scale denudation. North of the mountain front, rocks in the southern half of the foreland basin were exposed to maximum paleotemperatures 110??C in the Late Cretaceous to early Paleocene as a result of burial by Upper Jurassic and Cretaceous sedimentary rocks. Rapid cooling from these elevated paleotemperatures also occurred due to distinct episodes of kilometer-scale denudation at ???60??4 Ma, 46??3 Ma, 35??2 Ma, and ???24??3 Ma. Combined, the apatite analyses indicate that rocks exposed along the TACT line through the central Brooks Range and foreland basin experienced episodic rapid cooling throughout the Late Cretaceous and Cenozoic in response to at least three distinct kilometer-scale denudation events. Future models explaining orogenic events in northern Alaska must consider these new constraints from fission track thermochronology. Copyright 1997 by the American Geophysical Union.

O'Sullivan, P. B.; Murphy, J. M.; Blythe, A. E.

1997-01-01

81

Numerical simulations of anisotropic plasmas using a modified ZEUS-MP  

NASA Astrophysics Data System (ADS)

Three dimensional linear and nonlinear simulations of collisionless one-fluid plasmas with pressure anisotropy are presented using the Chew- Goldberger-Low (CGL-MHD) and double-isothermal models. For this purpose, the code ZEUS-MP [J. C. Hayes et. al. The APJ Supplement Series 165 (2006) 188.] has been modified. Major modifications include a changed method of characteristics, new compressive and non-compressive forces, and a ``hard wall'' limit on pressure anisotropy that is intended to mimic the effects of plasma micro-instabilities that limit the temperature anisotropy. For purposes of validation, more than 100 test simulations of linear waves (Alfven, slow and fast), instabilities (firehose and mirror) and nonlinear vortices (Orszag-Tang) are presented for a number of initial conditions and parameters. Finally, this model is used to investigate the way that Alfven-wave turbulence leads to a spreading of the temperature-anisotropy probability distribution in the solar wind. Analysis is completed with a detailed analysis of the fluctuation data.

Chandran, Benjamin; Tangri, Varun; Sarkar, Aveek; Perez, Jean; Sharma, Prateek

2012-10-01

82

Seasonal dynamics, environmental preferences and habitat selection of John Dory (Zeus faber)  

NASA Astrophysics Data System (ADS)

Spatial distribution patterns of John Dory (Zeus faber, L.) were examined in relation to sea bottom temperature, bathymetry, locational covariates and season. Data were collected during a 2-year period (1996 1997) of seasonal sampling using demersal trawl surveys in the Aegean Sea (eastern Mediterranean). The ecological preferences of the species throughout four seasons were elucidated and the degree in which these environmental relationships might be modulated by the different hydrographic and topographic regime was also considered. Key determinants of the species' spatial aggregation in all four seasons were the water depth, the sea bottom temperature and the latitude. The sea bottom temperature had a significant effect on seasonal John Dory abundance both directly, as a main effect, and indirectly, through its interactive effect with the water depth. John Dory seasonal abundance was consistently greater in the shallower regions of the area having warmer bottom waters. Results indicated a distinct southward shift as progressing through the year, with peak abundances being observed in gradually lower latitudes of shallow areas as seasons evolved. John Dory appeared to avoid the deeper waters regardless of their bottom temperature and geographic position. The present results also suggested a seasonal pattern of habitat associations for specific locations characterised by weak hydrographic activity. John Dory preferences for certain water depth zones, sea bottom temperatures and substrate types are hypothesized to modulate the seasonal spatial aggregation of the species to preferred grounds.

Maravelias, C. D.; Tsitsika, E. V.; Papaconstantinou, C.

2007-05-01

83

Animal Tracks  

NSDL National Science Digital Library

For those of us living in Northern climates, when winter snow covers the landscape it provides great conditions to search for animal tracks. The following websites provide an abundance of information and resources about the ancient art of animal tracking.The first site(1 ), Beartracker's Animal Tracks Den, is an excellent comprehensive "online field guide to tracks and tracking." The site includes animal track images, photos, as well as information about mammals, reptiles, birds, insects, amphibians, and other tracking resources. The second site (2), is an article by Jon C. Boren, Extension Wildlife Specialist and Byron D. Wright, Agricultural Specialist both from the University of New Mexico entitled Identifying and Preserving Wildlife Tracks. The third site (3), on Tracking and Stalking Wildlife, comes from The Virtual Cub Scout Leader's Handbook and provides short information pages on a variety on animals including photos and images of tracks. The fourth site (4) is a well-organized lesson plan with activities on Animal Signs from Eagle Bluff Environmental Learning Center. The fifth site (5) is the Outdoor Action Guide to Animal Tracking by Rick Curtis of Princeton University. This website provides solid and detailed information on many aspects of animal tracking including parts of a track, pattern classification, aging tracks, and more. The sixth site (6) is an article by veteran tracker Jim Halfpenny, Ph.D. about how to determine the accurate track size for an animal. Site visitors can link from this article to the homepage for A Naturalist's World which has information about tracking classes offered in various North American locations. For anyone interested in developing their animal tracking skills, the final two websites also offer courses from very experienced trackers in different regions of North America. The seventh site (7), Tom Brown's Tracker School is the largest school of its kind with locations in New Jersey, California, and Florida. The eighth site, (8) Wilderness Awareness School is located in Washington but offers courses in other regions as well. This website also provides an extensive list of links for many other tracking resources.

84

Hurricane Tracking  

NSDL National Science Digital Library

This homework assignment is given in the first two weeks of class. Students receive one or two lectures that cover the topics of atmospheric layers, temperature and pressure profiles, concepts of atmospheric mass and pressure and measuring (i.e. dropsonde) instrumentation. At the beginning of each lecture I briefly show them the tropical update from the NOAA National Hurricane Center web site; if there is an active storm, I show where I go to get more info, such as the projected storm track and storm history (for example, from Intellicast Hurricane Tracking). Then, for this assignment, I reintroduce them to these hurricane information web sites and demonstrate how to find the historical data on tropical storms (such as from the Unisys Hurricane Data Archive), and how to copy and paste text data into word and/or excel, as a tab- or space-delimited file. I point out some problem areas with this data-grabbing method, such as headers that get lost from their associated data column or date information that may not format as dates. I then hand out the assignment, which asks them to: Find data on a current or recent (this year) tropical system, provide the name and year of the storm and the reference web site, and plot the wind speed and pressure variables against time. Students should label the axes and give a descriptive title to the chart. Describe what they notice in the graphed data and if it seems believable (this allows students to decide if they have done the task correctly by using their understanding of the data). Predict what will happen if the storm a) intensifies or b) weakens. I then provide another data set (of any long-duration tropical storm that formed, weakened and later re-intensified) and ask them to go through the same process of plotting and interpretation. I tell them that some future climate predictions are for more storms with lower central pressures and ask which of the two charts best represents that future scenario, and why.

Doner, Lisa

85

ZEUS results on the measurement and phenomenology of F{sub 2} at low x and low Q{sup 2}.  

SciTech Connect

Measurements of the proton structure function for and from ZEUS 1995 shifted vertex data are presented. From ZEUS data the slopes at fixed x and for at fixed are derived. For the latter, E665 data are also used. The transition region in is explored using the simplest non-perturbative models and NLO QCD. The data at very low are described successfully by a combination of generalised vector meson dominance and Regge theory. From a NLO QCD fit to ZEUS data the gluon density in the proton is extracted in the range . Data from NMC and BCDMS constrain the fit at large x. Assuming the NLO QCD description to be valid down to , it is found that the sea distribution is still rising at small x and the lowest values whereas the gluon distribution is strongly suppressed.

Breitweg, J.; Chekanov, S.; Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Repond, J.; Stanek, R.; Talaga, R. L.; Yoshida, R.; Zhang, H.; ZEUS Collaboration; High Energy Physics

1999-03-01

86

Zeus: Fast-spectrum critical assemblies with an iron-HEU core surrounded by a copper reflector  

SciTech Connect

Experiments to investigate critical systems of iron moderated highly enriched uranium in the intermediate-energy range were attempted. However, due to size limitations, the systems fell into the fast-energy range. Two critical configurations were established with a uranium mass of {approx} 198 kg and a Fe/{sup 235}U Ratio of {approx}15. Experimental uncertainties were systematically evaluated to estimate their effect on multiplication. The combined uncertainty for these experiments is estimated to be {+-}0.0024 {Delta}{sub eff}. Consequently, both Zeus iron configurations are judged to be acceptable for use as criticality-safety benchmark experiments. (authors)

Hayes, D. K.; Sanchez, R. G.; Kahler, A. C. [Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545 (United States)

2006-07-01

87

Beyond Tracking.  

ERIC Educational Resources Information Center

On the surface, educational tracking may seem like a useful tool for allowing students to work at their own pace, and to avoid discouraging competition, but abuses of the tracking idea have arisen through biased placement practices that have denied equal access to education for minority students. The articles in this issue explore a number of…

Bates, Percy; And Others

1992-01-01

88

Tectonic and thermal history of the western Serrania del Interior foreland fold and thrust belt and Guarico Basin, north central Venezuela: Implications of new apatite fission track analysis and seismic interpretation  

NASA Astrophysics Data System (ADS)

Structural analysis, interpretation of seismic reflection lines, and apatite fission-track analysis in the Western Serrania del Interior fold and thrust belt and in the Guarico basin of north-central Venezuela indicate that the area underwent Mesozoic and Tertiary-to-Recent deformation. Mesozoic deformation, related to the breakup of Pangea, resulted in the formation of the Espino graben in the southernmost portion of the Guarico basin and in the formation of the Proto-Caribbean lithosphere between the diverging North and South American plates. The northern margin of Venezuela became a northward facing passive margin. Minor normal faults formed in the Guarico basin. The most intense deformation took place in the Neogene when the Leeward Antilles volcanic island arc collided obliquely with South America. The inception of the basal foredeep unconformity in the Late Eocene-Early Oligocene marks the formation of a perisutural basin on top of a buried graben system. It is coeval with minor extension and possible reactivation of Cretaceous normal faults in the Guarico basin. It marks the deepening of the foredeep. Cooling ages derived from apatite fission-tracks suggest that the obduction of the fold and thrust belt in the study area occurred in the Late Oligocene through the Middle Miocene. Field data and seismic interpretations suggest also that contractional deformation began during the Neogene, and specifically during the Miocene. The most surprising results of the detrital apatite fission-track study are the ages acquired in the sedimentary rocks of the easternmost part of the study area in the foreland fold and thrust belt. They indicate an Eocene thermal event. This event may be related to the Eocene NW-SE convergence of the North and South American plates that must have caused the Proto-Caribbean lithosphere to be shortened. This event is not related to the collision of the arc with South America, as the arc was far to the west during the Eocene.

Perez de Armas, Jaime Gonzalo

89

Survey of hydrologic models and hydrologic data needs for tracking flow in the Rio Grande, north-central New Mexico, 2010  

USGS Publications Warehouse

The six Middle Rio Grande Pueblos have prior and paramount rights to deliveries of water from the Rio Grande for their use. When the pueblos or the Bureau of Indian Affairs Designated Engineer identifies a need for additional flow on the Rio Grande, the Designated Engineer is tasked with deciding the timing and amount of releases of prior and paramount water from storage at El Vado Reservoir to meet the needs of the pueblos. Over the last three decades, numerous models have been developed by Federal, State, and local agencies in New Mexico to simulate, understand, and (or) manage flows in the Middle Rio Grande upstream from Elephant Butte Reservoir. In 2008, the Coalition of Six Middle Rio Grande Basin Pueblos entered into a cooperative agreement with the U.S. Geological Survey to conduct a comprehensive survey of these hydrologic models and their capacity to quantify and track various components of flow. The survey of hydrologic models provided in this report will help water-resource managers at the pueblos, as well as the Designated Engineer, make informed water-resource-management decisions that affect the prior and paramount water use. Analysis of 4 publicly available surface-water models and 13 publicly available groundwater models shows that, although elements from many models can be helpful in tracking flow in the Rio Grande, numerous data gaps and modeling needs indicate that accurate, consistent, and timely tracking of flow on the Rio Grande could be improved. Deficient or poorly constrained hydrologic variables are sources of uncertainty in hydrologic models that can be reduced with the acquisition of more refined data. Data gaps need to be filled to allow hydrologic models to be run on a real-time basis and thus ensure predictable water deliveries to meet needs for irrigation, domestic, stock, and other water uses. Timeliness of flow-data reporting is necessary to facilitate real-time model simulation, but even daily data are sometimes difficult to obtain because the data come from multiple sources. Each surface-water model produces results that could be helpful in quantifying the flow of the Rio Grande, specifically by helping to track water as it moves down the channel of the Rio Grande and by improving the understanding of river hydraulics for the specified reaches. The ability of each surface-water model to track flow on the Rio Grande varies according to the purpose for which each model was designed. The purpose of Upper Rio Grande Water Operations Model (URGWOM) - to simulate water storage and delivery operations in the Rio Grande - is more applicable to tracking flow on the Rio Grande than are any of the other surface-water models surveyed. Specifically, the strengths of URGWOM in relation to modeling flow are the details and attention given to the accounting of Rio Grande flow and San Juan-Chama flow at a daily time step. The most significant difficulty in using any of the surveyed surface-water models for the purpose of predicting the need for requested water releases is that none of the surface-water models surveyed consider water accounting on a real-time basis. Groundwater models that provide detailed simulations of shallow groundwater flow in the vicinity of the Rio Grande can provide large-scale estimates of flow between the Rio Grande and shallow aquifers, which can be an important component of the Rio Grande water budget as a whole. The groundwater models surveyed for this report cannot, however, be expected to provide simulations of flow at time scales of less than the simulated time step (1 month to 1 year in most cases). Of those of the currently used groundwater models, the purpose of model 13 - to simulate the shallow riparian groundwater environment - is the most appropriate for examining local-scale surface-water/groundwater interactions. The basin-scale models, however, are also important in understanding the large-scale water balances between the aquifers and the surface water. In the case of the Upper and Middle Rio Grande Valley, models 6, 10, and 12 are the most accurate and current

Tillery, Anne; Eggleston, Jack R.

2012-01-01

90

40Ar\\/ 39Ar, pressure, temperature and fission track constraints on the age and nature of metamorphism around the main central thrust in the eastern Bhutan Himalaya  

Microsoft Academic Search

40Ar\\/39Ar data from a profile across the Main Central Thrust in the eastern Bhutan Himalaya indicate muscovite cooling ages of 14.1±0.2 Ma from a sample in the immediate hanging wall of the thrust and 11.2 Ma from about 400 m structurally higher in the hanging wall. These two ages are repeated by two samples from 2.1 and 4.7 km vertical distance from

K. Stüwe; D Foster

2001-01-01

91

An assessment of the accuracy and availability of data in electronic patient tracking systems for patients receiving HIV treatment in central Mozambique  

PubMed Central

Background Since the rapid scale-up of antiretroviral therapy (ART) programs in sub-Saharan Africa, electronic patient tracking systems (EPTS) have been deployed to respond to the growing demand for program monitoring, evaluation and reporting to governments and donors. These routinely collected data are often used in epidemiologic and operations research studies intended to improve programs. To ensure accurate reporting and good quality for research, the reliability and completeness of data systems need to be assessed and reported. We assessed the completeness and reliability of EPTS used in 16 HIV care and treatment clinics in Manica and Sofala provinces of Mozambique. Methods We conducted a cross-sectional study to assess the completeness and reliability of key variables in the electronic data system for patients enrolling in 16 public sector HIV treatment clinics between 1 July 2004 and 30 June 2008. Data from the electronic database was compared with data abstracted from a stratified random sample of 520 patient charts. Percent agreement, kappa scores and concordance correlation coefficients were calculated for specified variables. Percentile bootstrap confidence intervals were calculated to account for the stratified nature of our sampling. Results A total of 16,149 patients with a median age of 33 years and a median CD4 count of 151 enrolled in these 16 clinics between 1 July 2004 and 30 June 2008. The level of completeness was high for most variables with height (18.6%) and weight (11.5%) having the highest amount of missing data. The level of agreement for available data was also high with reliability statistics of 0.95 (95% CI: 0.92-0.98) for gender, 0.91 (95% CI: 0.80-1.00) for pre-ART CD4 value and 0.97 (95% CI: 0.95-0.99) for patient retention. Conclusions Electronic patient tracking systems have been deployed to respond to the growing monitoring, evaluation and reporting requirements. In our cross-sectional study of clinics in Manica and Sofala provinces of Mozambique, we found high levels of completeness and reliability for key variables indicating that these electronic databases provided adequate data not only for monitoring and evaluation but also for research. Routine evaluations of the completeness and reliability of these databases need to occur to ensure high quality data are being used for reporting and research.

2012-01-01

92

Climatic Changes from 12,000 to 4,000 Years Ago in the Austrian Central Alps Tracked by Sedimentological and Biological Proxies of a Lake Sediment Core  

Microsoft Academic Search

Major and trace elements, minerals, and grain-size were analysed from the early to mid-Holocene (12 to 4 ky BP) period of\\u000a a sediment core from the Alpine lake Oberer Landschitzsee (ObLAN, 2076 m a.s.l.), which is located on predominantly crystalline\\u000a bedrock on the southern slopes of the Austrian Central Alps. Geochemistry and mineralogy were compared with diatom-inferred\\u000a (Di-) ‘date of autumn mixing’

Roland Schmidt; Christian Kamenik; Richard Tessadri; Karin Anne Koinig

2006-01-01

93

Tracking the dissipation of energy and angular momentum in central collisions between Ag and sup 40 Ar of 7, 17, 27, and 34 MeV/nucleon  

SciTech Connect

A 4{pi} charged-particle multidetector has been used to study the reaction {sup 40}Ar+{sup nat}Ag from 280--1356 MeV. Charged-particle multiplicity distributions show a low-multiplicity group associated with peripheral collisions and a high-multiplicity group associated with central collisions. Average multiplicities for central collisions increase with increasing projectile energy, indicating ever-increasing collision violence. Angular distributions of emitted protons are essentially isotropic for {theta}{ge}80{degree} in a reference frame characterized by the empirical systematics of linear momentum transfer (i.e., {approx}100% to {approx}70% from 7--34 MeV/nucleon). Spectra of these protons at side angles are evaporationlike in shape and indicate relative effective temperatures of 3, 6, 8, and 12 MeV for beam energies of 7, 17, 27, and 34{ital A} MeV, respectively. Azimuthal angular correlations between various particle pairs are consistent with spin-driven emission from emitter sources of reasonable spin values. In short, these results support a classical picture of extensively thermalized emitter nuclei even for initial excitation energies of {approx}5 MeV per system nucleon and spins of {ge}100{h bar}.

Ethvignot, T.; Elmaani, A.; Ajitanand, N.N.; Alexander, J.M.; Bauge, E.; Bier, P.; Kowalski, L.; Magda, M.T.; Desesquelles, P.; Elhage, H.; Giorni, A.; Heuer, D.; Kox, S.; Lleres, A.; Merchez, F.; Morand, C.; Rebreyend, D.; Stassi, P.; Viano, J.B.; Benrachi, S.; Chambon, B.; Cheynis, B.; Drain, D.; Pastor, C. (State University of New York at Stony Brook, Stony Brook, New York 11794-3400 (USA) Institut des Sciences Nucleaires de Grenoble, Universite, (France)); Fourier, J. (Institut National de Physique Nucleaire et de Physique des Particules, 53 avenue des Martyrs, 38026, Grenoble CEDEX, (France) Institut de Physique Nucleaire de Lyon, Universite Claude Bernard 1 (France) Institut National de Physique Nucleaire et de Physique des Particules, 43 boulevard du 11 Novembre 1918, Villeurbanne CEDEX, (France))

1991-05-01

94

Tracking the dissipation of energy and angular momentum in central collisions between Ag and 40Ar of 7, 17, 27, and 34 MeV/nucleon  

NASA Astrophysics Data System (ADS)

A 4? charged-particle multidetector has been used to study the reaction 40Ar+natAg from 280-1356 MeV. Charged-particle multiplicity distributions show a low-multiplicity group associated with peripheral collisions and a high-multiplicity group associated with central collisions. Average multiplicities for central collisions increase with increasing projectile energy, indicating ever-increasing collision violence. Angular distributions of emitted protons are essentially isotropic for ?>=80° in a reference frame characterized by the empirical systematics of linear momentum transfer (i.e., ~=100% to ~=70% from 7-34 MeV/nucleon). Spectra of these protons at side angles are evaporationlike in shape and indicate relative effective temperatures of 3, 6, 8, and 12 MeV for beam energies of 7, 17, 27, and 34A MeV, respectively. Azimuthal angular correlations between various particle pairs are consistent with spin-driven emission from emitter sources of reasonable spin values. In short, these results support a classical picture of extensively thermalized emitter nuclei even for initial excitation energies of ~=5 MeV per system nucleon and spins of >=100?.

Ethvignot, T.; Elmaani, A.; Ajitanand, N. N.; Alexander, J. M.; Bauge, E.; Bier, P.; Kowalski, L.; Magda, M. T.; Désesquelles, P.; Elhage, H.; Giorni, A.; Heuer, D.; Kox, S.; Lleres, A.; Merchez, F.; Morand, C.; Rebreyend, D.; Stassi, P.; Viano, J. B.; Benrachi, S.; Chambon, B.; Cheynis, B.; Drain, D.; Pastor, C.; Fourier, Joseph

1991-05-01

95

Measurement of neutral current cross sections at high Bjorken-x with the ZEUS detector at HERA  

NASA Astrophysics Data System (ADS)

A new method is employed to measure the neutral current cross section up to Bjorken-x values of one with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb-1 for e+p collisions and 16.7 pb-1 for e-p collisions at sqrt{s}=318 GeV and 38.6 pb-1 for e+p collisions at sqrt{s}=300 GeV. Cross sections have been extracted for Q2?648 GeV2 and are compared to predictions using different parton density functions. For the highest x bins, the data have a tendency to lie above the expectations using recent parton density function parametrizations.

Chekanov, S.; Derrick, M.; Magill, S.; Miglioranzi, S.; Musgrave, B.; Nicholass, D.; Repond, J.; Yoshida, R.; Mattingly, M. C. K.; Pavel, N.; Molina, A. G. Y.; Antonelli, S.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Bindi, M.; Boscherini, D.; Bruni, A.; Bruni, G.; Cifarelli, L.; Cindolo, F.; Contin, A.; Corradi, M.; de Pasquale, S.; Iacobucci, G.; Margotti, A.; Nania, R.; Polini, A.; Rinaldi, L.; Sartorelli, G.; Zichichi, A.; Aghuzumtsyan, G.; Bartsch, D.; Brock, I.; Goers, S.; Hartmann, H.; Hilger, E.; Jakob, H.-P.; Jüngst, M.; Kind, O. M.; Paul, E.; Rautenberg, J.; Renner, R.; Samson, U.; Schönberg, V.; Wang, M.; Wlasenko, M.; Brook, N. H.; Heath, G. P.; Morris, J. D.; Namsoo, T.; Capua, M.; Fazio, S.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Tassi, E.; Kim, J. Y.; Ma, K. J.; Ibrahim, Z. A.; Kamaluddin, B.; Wan Abdullah, W. A. T.; Ning, Y.; Ren, Z.; Sciulli, F.; Chwastowski, J.; Eskreys, A.; Figiel, J.; Galas, A.; Gil, M.; Olkiewicz, K.; Stopa, P.; Zawiejski, L.; Adamczyk, L.; Bo?d, T.; Grabowska-Bo?d, I.; Kisielewska, D.; ?ukasik, J.; Przybycie?, M.; Suszycki, L.; Kota?ski, A.; S?omi?ski, W.; Adler, V.; Behrens, U.; Bloch, I.; Bonato, A.; Borras, K.; Coppola, N.; Fourletova, J.; Geiser, A.; Gladkov, D.; Göttlicher, P.; Gregor, I.; Gutsche, O.; Haas, T.; Hain, W.; Horn, C.; Kahle, B.; Kötz, U.; Kowalski, H.; Lim, H.; Lobodzinska, E.; Löhr, B.; Mankel, R.; Melzer-Pellmann, I.-A.; Montanari, A.; Nguyen, C. N.; Notz, D.; Nuncio-Quiroz, A. E.; Santamarta, R.; Schneekloth, U.; Spiridonov, A.; Stadie, H.; Stösslein, U.; Szuba, D.; Szuba, J.; Theedt, T.; Watt, G.; Wolf, G.; Wrona, K.; Youngman, C.; Zeuner, W.; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Bamberger, A.; Dobur, D.; Karstens, F.; Vlasov, N. N.; Bussey, P. J.; Doyle, A. T.; Dunne, W.; Ferrando, J.; Saxon, D. H.; Skillicorn, I. O.; Gialas, I.; Gosau, T.; Holm, U.; Klanner, R.; Lohrmann, E.; Salehi, H.; Schleper, P.; Schörner-Sadenius, T.; Sztuk, J.; Wichmann, K.; Wick, K.; Kataoka, M.; Matsumoto, T.; Nagano, K.; Tokushuku, K.; Yamada, S.; Yamazaki, Y.; Foudas, C.; Fry, C.; Long, K. R.; Tapper, A. D.; Barakbaev, A. N.; Boos, E. G.; Dossanov, A.; Pokrovskiy, N. S.; Zhautykov, B. O.; Son, D.; de Favereau, J.; Piotrzkowski, K.; Barreiro, F.; Glasman, C.; Jimenez, M.; Labarga, L.; Del Peso, J.; Ron, E.; Terrón, J.; Zambrana, M.; Corriveau, F.; Liu, C.; Walsh, R.; Zhou, C.; Tsurugai, T.; Antonov, A.; Dolgoshein, B. A.; Rubinsky, I.; Sosnovtsev, V.; Stifutkin, A.; Suchkov, S.; Dementiev, R. K.; Ermolov, P. F.; Gladilin, L. K.; Katkov, I. I.; Khein, L. A.; Korzhavina, I. A.; Kuzmin, V. A.; Levchenko, B. B.; Lukina, O. Y.; Proskuryakov, A. S.; Shcheglova, L. M.; Zotkin, D. S.; Zotkin, S. A.; Abt, I.; Büttner, C.; Caldwell, A.; Kollar, D.; Schmidke, W. B.; Sutiak, J.; Grigorescu, G.; Keramidas, A.; Koffeman, E.; Kooijman, P.; Pellegrino, A.; Tiecke, H.; Vázquez, M.; Wiggers, L.; Brümmer, N.; Bylsma, B.; Durkin, L. S.; Lee, A.; Ling, T. Y.; Allfrey, P. D.; Bell, M. A.; Cooper-Sarkar, A. M.; Cottrell, A.; Devenish, R. C. E.; Foster, B.; Gwenlan, C.; Korcsak-Gorzo, K.; Patel, S.; Roberfroid, V.; Robertson, A.; Straub, P. B.; Uribe-Estrada, C.; Walczak, R.; Bellan, P.; Bertolin, A.; Brugnera, R.; Carlin, R.; Ciesielski, R.; Dal Corso, F.; Dusini, S.; Garfagnini, A.; Limentani, S.; Longhin, A.; Stanco, L.; Turcato, M.; Oh, B. Y.; Raval, A.; Whitmore, J. J.; Iga, Y.; D'Agostini, G.; Marini, G.; Nigro, A.; Cole, J. E.; Hart, J. C.; Abramowicz, H.; Gabareen, A.; Ingbir, R.; Kananov, S.; Levy, A.; Kuze, M.; Hori, R.; Kagawa, S.; Shimizu, S.; Tawara, T.; Hamatsu, R.; Kaji, H.; Kitamura, S.; Ota, O.; Ri, Y. D.; Ferrero, M. I.; Monaco, V.; Sacchi, R.; Solano, A.; Arneodo, M.; Ruspa, M.; Fourletov, S.; Martin, J. F.; Boutle, S. K.; Butterworth, J. M.; Hall-Wilton, R.; Jones, T. W.; Loizides, J. H.; Sutton, M. R.; Targett-Adams, C.; Wing, M.; Brzozowska, B.; Ciborowski, J.; Grzelak, G.; Kulinski, P.; ?u?niak, P.; Malka, J.; Nowak, R. J.; Pawlak, J. M.; Tymieniecka, T.; Ukleja, A.; Ukleja, J.; ?arnecki, A. F.; Adamus, M.; Plucinski, P.; Eisenberg, Y.; Giller, I.; Hochman, D.; Karshon, U.; Rosin, M.; Brownson, E.; Danielson, T.; Everett, A.; Kçira, D.; Reeder, D. D.; Ryan, P.; Savin, A. A.; Smith, W. H.; Wolfe, H.; Bhadra, S.; Catterall, C. D.; Cui, Y.; Hartner, G.; Menary, S.; Noor, U.; Soares, M.; Standage, J.; Whyte, J.

2007-01-01

96

Measurement of beauty production in DIS and [InlineEquation not available: see fulltext.] extraction at ZEUS  

NASA Astrophysics Data System (ADS)

Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb-1. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative to the jet. The cross section for beauty production was measured in the kinematic range of photon virtuality, Q 2>2 GeV2, and inelasticity, 0.05< y<0.7, with the requirement of a muon and a jet. Total and differential cross sections are presented and compared to QCD predictions. The beauty contribution to the structure function F 2 was extracted and is compared to theoretical predictions.

Abramowicz, H.; Abt, I.; Adamczyk, L.; Adamus, M.; Aggarwal, R.; Antonelli, S.; Antonioli, P.; Antonov, A.; Arneodo, M.; Aushev, V.; Aushev, Y.; Bachynska, O.; Bamberger, A.; Barakbaev, A. N.; Barbagli, G.; Bari, G.; Barreiro, F.; Bartsch, D.; Basile, M.; Behnke, O.; Behr, J.; Behrens, U.; Bellagamba, L.; Bertolin, A.; Bhadra, S.; Bindi, M.; Blohm, C.; Bo?d, T.; Boos, E. G.; Borodin, M.; Borras, K.; Boscherini, D.; Bot, D.; Boutle, S. K.; Brock, I.; Brownson, E.; Brugnera, R.; Brümmer, N.; Bruni, A.; Bruni, G.; Brzozowska, B.; Bussey, P. J.; Butterworth, J. M.; Bylsma, B.; Caldwell, A.; Capua, M.; Carlin, R.; Catterall, C. D.; Chekanov, S.; Chwastowski, J.; Ciborowski, J.; Ciesielski, R.; Cifarelli, L.; Cindolo, F.; Contin, A.; Cooper-Sarkar, A. M.; Coppola, N.; Corradi, M.; Corriveau, F.; Costa, M.; D'Agostini, G.; Dal Corso, F.; de Favereau, J.; Del Peso, J.; Dementiev, R. K.; de Pasquale, S.; Derrick, M.; Devenish, R. C. E.; Dobur, D.; Dolgoshein, B. A.; Doyle, A. T.; Drugakov, V.; Durkin, L. S.; Dusini, S.; Eisenberg, Y.; Ermolov, P. F.; Eskreys, A.; Fang, S.; Fazio, S.; Ferrando, J.; Ferrero, M. I.; Figiel, J.; Forrest, M.; Foster, B.; Fourletov, S.; Gach, G.; Galas, A.; Gallo, E.; Garfagnini, A.; Geiser, A.; Gialas, I.; Gladilin, L. K.; Gladkov, D.; Glasman, C.; Gogota, O.; Golubkov, Yu. A.; Göttlicher, P.; Grabowska-Bo?d, I.; Grebenyuk, J.; Gregor, I.; Grigorescu, G.; Grzelak, G.; Gwenlan, C.; Haas, T.; Hain, W.; Hamatsu, R.; Hart, J. C.; Hartmann, H.; Hartner, G.; Hilger, E.; Hochman, D.; Holm, U.; Hori, R.; Horton, K.; Hüttmann, A.; Iacobucci, G.; Ibrahim, Z. A.; Iga, Y.; Ingbir, R.; Ishitsuka, M.; Jakob, H.-P.; Januschek, F.; Jimenez, M.; Jones, T. W.; Jüngst, M.; Kadenko, I.; Kahle, B.; Kamaluddin, B.; Kananov, S.; Kanno, T.; Karshon, U.; Karstens, F.; Katkov, I. I.; Kaur, M.; Kaur, P.; Keramidas, A.; Khein, L. A.; Kim, J. Y.; Kisielewska, D.; Kitamura, S.; Klanner, R.; Klein, U.; Koffeman, E.; Kollar, D.; Kooijman, P.; Korol, Ie.; Korzhavina, I. A.; Kota?ski, A.; Kötz, U.; Kowalski, H.; Kulinski, P.; Kuprash, O.; Kuze, M.; Kuzmin, V. A.; Lee, A.; Levchenko, B. B.; Levy, A.; Libov, V.; Limentani, S.; Ling, T. Y.; Lisovyi, M.; Lobodzinska, E.; Lohmann, W.; Löhr, B.; Lohrmann, E.; Loizides, J. H.; Long, K. R.; Longhin, A.; Lontkovskyi, D.; Lukina, O. Yu.; ?u?niak, P.; Maeda, J.; Magill, S.; Makarenko, I.; Malka, J.; Mankel, R.; Margotti, A.; Marini, G.; Martin, J. F.; Mastroberardino, A.; Matsumoto, T.; Mattingly, M. C. K.; Melzer-Pellmann, I.-A.; Miglioranzi, S.; Mohamad Idris, F.; Monaco, V.; Montanari, A.; Morris, J. D.; Musgrave, B.; Nagano, K.; Namsoo, T.; Nania, R.; Nicholass, D.; Nigro, A.; Ning, Y.; Noor, U.; Notz, D.; Nowak, R. J.; Nuncio-Quiroz, A. E.; Oh, B. Y.; Okazaki, N.; Oliver, K.; Olkiewicz, K.; Onishchuk, Yu.; Ota, O.; Papageorgiu, K.; Parenti, A.; Paul, E.; Pawlak, J. M.; Pawlik, B.; Pelfer, P. G.; Pellegrino, A.; Perlanski, W.; Perrey, H.; Piotrzkowski, K.; Plucinski, P.; Pokrovskiy, N. S.; Polini, A.; Proskuryakov, A. S.; Przybycie?, M.; Raval, A.; Reeder, D. D.; Reisert, B.; Ren, Z.; Repond, J.; Ri, Y. D.; Robertson, A.; Roloff, P.; Ron, E.; Rubinsky, I.; Ruspa, M.; Sacchi, R.; Salii, A.; Samson, U.; Sartorelli, G.; Savin, A. A.; Saxon, D. H.; Schioppa, M.; Schlenstedt, S.; Schleper, P.; Schmidke, W. B.; Schneekloth, U.; Schönberg, V.; Schörner-Sadenius, T.; Schwartz, J.; Sciulli, F.; Shcheglova, L. M.; Shehzadi, R.; Shimizu, S.; Singh, I.; Skillicorn, I. O.; S?omi?ski, W.; Smith, W. H.; Sola, V.; Solano, A.; Son, D.; Sosnovtsev, V.; Spiridonov, A.; Stadie, H.; Stanco, L.; Stern, A.; Stewart, T. P.; Stifutkin, A.; Stopa, P.; Suchkov, S.; Susinno, G.; Suszycki, L.; Sztuk, J.; Szuba, D.; Szuba, J.; Tapper, A. D.; Tassi, E.; Terrón, J.; Theedt, T.; Tiecke, H.; Tokushuku, K.; Tomalak, O.; Tomaszewska, J.; Tsurugai, T.; Turcato, M.; Tymieniecka, T.; Uribe-Estrada, C.; Vázquez, M.; Verbytskyi, A.; Viazlo, V.; Vlasov, N. N.; Volynets, O.; Walczak, R.; Wan Abdullah, W. A. T.; Whitmore, J. J.; Whyte, J.; Wiggers, L.; Wing, M.; Wlasenko, M.; Wolf, G.; Wolfe, H.; Wrona, K.; Yagües-Molina, A. G.; Yamada, S.; Yamazaki, Y.; Yoshida, R.; Youngman, C.; ?arnecki, A. F.; Zawiejski, L.; Zenaiev, O.; Zeuner, W.; Zhautykov, B. O.; Zhmak, N.; Zhou, C.; Zichichi, A.; Zolko, M.; Zotkin, D. S.; Zulkapli, Z.; ZEUS Collaboration

2010-10-01

97

Transit Tracks  

NSDL National Science Digital Library

In this space science activity, learners explore transits and the conditions when a transit may be seen. Learners use models to investigate how a planet's size and distance from its star affects the behavior of transits. Learners also use mathematics to interpret graphs of brightness vs. time to deduce information about planet-star systems. This lesson includes educator instructions, photocopy masters for Transit Light Curves, Option Math for Transit Tracks, Keplerâs 3rd Law graphs, cube root tables, an account of Jeremiah Horrocks' 1639 observation of the transit of Venus, and an answer key for the Transit Tracks Light Curves.

Science, Lawrence H.

2008-01-01

98

Provenance and hinterland exhumation from LA-ICP-MS zircon U-Pb and fission-track double dating of Cretaceous sediments in the Jianghan Basin, Yangtze block, central China  

NASA Astrophysics Data System (ADS)

Crystallization and cooling ages obtained from fission-track and U-Pb double dating of single zircons using LA-ICP-MS from five samples of Cretaceous Jianghan Basin strata, Yangtze block, central China, refine sediment sources and source-area exhumation. The Huangling basement massif of the northwestern Yangtze Craton and the Qinling-Dabie Orogen along the northern margin of the Yangtze block provided the U-Pb zircon-age populations. Two rapid cooling events at ca. 840-800 and ~ 206-151 to 43 Ma existed in the Huangling massif and the major exhumation period of the Qinling-Dabie Orogen at 221-195 Ma. The important tectonothermal event at 221-195 Ma of the Qinling-Dabie Orogen was characterized by the collision between the south China and the north China block and overprinted the whole Qinling-Dabie Orogen and the north Yangtze block. Together with the published geochronology, our data constrain the paleogeography of eastern China: (i) The Upper Triassic-Lower Jurassic strata have their sources in the Qinling-Dabie Orogen and the Cathaysia and Yangtze basement of the South China Block. (ii) In the Middle Jurassic, the Sichuan, Jianghan, Hengyang, and Mayang basins formed a large composite basin with identical provenance from the Qinling-Dabie Orogen and the Cathaysia. (iii) Since the Late Cretaceous, the Jiangnan Orogen and a mountain belt along the Pacific coast constituted important topographic boundaries in southern China. Within the Jianghan Basin, the maximum depositional ages of the Shimen, Wulong, Luojingtan, and Honghuatao Formations are approximately 145.53 ± 11.23, 113.09 ± 11.37, 96.00 ± 9.29, and 89.43 ± 9.29 Ma, respectively. This study demonstrates the feasibility of LA-ICP-MS zircon fission track and U-Pb double dating to refine the identification of sediment sources and determine the exhumation of source areas.

Shen, Chuan-Bo; Donelick, Raymond A.; O'Sullivan, Paul B.; Jonckheere, Raymond; Yang, Zhao; She, Zhen-Bing; Miu, Xiang-Liang; Ge, Xiang

2012-12-01

99

Number Track  

NSDL National Science Digital Library

Students can use this interactive Flash applet to practice ordering whole numbers within 20. The applet displays a track and number tiles, which the user drags to create the correct sequence of numbers 1 through 20. Users may choose from four levels: place 5 missing numbers, place 10 numbers, arrange all 20 numbers, or create your own challenge.

Bunker, Dan

2010-01-01

100

Make Tracks  

NSDL National Science Digital Library

Design a roller coaster and then climb aboard and see how it rides! You can watch the ride from right above the car itself or, if your stomach isnât up to that, from a fixed position away from the track. Youâll get a continuous readout of the coaster speed and acceleration.

2004-06-03

101

Person Tracking  

NASA Astrophysics Data System (ADS)

One of the most basic building blocks for the understanding of human actions and interactions is the accurate detection and tracking of persons in a scene. In constrained scenarios involving at most one subject, or in situations where persons can be confined to a controlled monitoring space or required to wear markers, sensors, or microphones, these tasks can be solved with relative ease. However, when accurate localization and tracking have to be performed in an unobtrusive or discreet fashion, using only distantly placed microphones and cameras, in a variety of natural and uncontrolled scenarios, the challenges posed are much greater. The problems faced by video analysis are those of poor or uneven illumination, low resolution, clutter or occlusion, unclean backgrounds, and multiple moving and uncooperative users that are not always easily distinguishable.

Bernardin, Keni; Stiefelhagen, Rainer; Pnevmatikakis, Aristodemos; Lanz, Oswald; Brutti, Alessio; Casas, Josep R.; Potamianos, Gerasimos

102

Historical Hurricane Tracks  

NSDL National Science Digital Library

The Historical Hurricane Tracks tool is an interactive mapping application that allows you to easily search and display Atlantic Basin and East-Central Pacific Basin tropical cyclone data. At this web site you can learn about historical tropical cyclones occurring in different areas located throughout the Atlantic, Caribbean, and Gulf of Mexico. The web site provides information about U.S. coastal county population versus hurricane strikes as well as links to various Internet resources focusing on tropical cyclones. The interactive mapping application allows you to search the National Hurricane Center historical tropical cyclone database and graphically display storms affecting your area since 1851.

2010-11-18

103

Tracking Otters  

NSDL National Science Digital Library

This activity (on pages 38-43) has learners simulate the way scientists track and map the movement of otters in the wild using radio trackers. One learner plays the role of Sea Otter, and other pairs of learners play the roles of Receiver and Tracker. The Sea Otter uses a clicker to represent the electronic transmitter on the otter, and each blindfolded Receiver listens through a paper towel tube "antenna" while the Tracker records where their partner hears the loudest click.

Museum, University O.; Nebraska Cooperative Extension 4-H Youth Development

2001-01-01

104

Tracking Sunspots  

NSDL National Science Digital Library

In this activity, students track the movements of sunspots using images from the Solar and Heliospheric Observatory (SOHO) satellite. Working in pairs, they observe images of the sun from consecutive days and plot the sunspots on a grid, then calculate average daily movement (in degrees of latitude) and use this information to determine the length of the solar day. The individual daily images are also combined to form a movie showing the sun's rotation.

105

Measurement of the Proton Structure Function F 2 at Low Q 2 and Very Low x with the ZEUS Beam Pipe Calorimeter at HERA  

Microsoft Academic Search

Results on measurements of the proton structure function from the two HERA experiments H1 and ZEUS in 1994 show that perturbative QCD (pQCD) allows to describe the observed rapid rise of with decreasing x down to Q2 = 1.5GeV2. Whereas the pQCD region exhibits a strong rise of s?*ptot with increasing W2, the total cross-section for real photon-proton scattering s?ptot

Bernd Surrow

2000-01-01

106

The CDF Central Outer Tracker  

SciTech Connect

We describe the CDF Central Outer Tracker (COT), an open-cell drift chamber currently being constructed for the CDF detector to run at the upgraded Fermilab Tevatron collider. This detector will provide central tracking with excellent momentum resolution in the high- density environment of a hadron collider. It will be able to resolve 132 ns beam crossings and provide tracking trigger information to the Level 1 trigger. The design is based upon the existing and successful CDF Central Tracking Chamber. The preliminary mechanical and electrical designs are presented. 5 refs., 5 figs., 1 tab.

Pitts, K.T.; CDF Collaboration

1997-01-01

107

Making Tracks  

NSDL National Science Digital Library

In this activity, students will make trackways by running across sheets of paper; their classmates will then determine what they can interpret from the trackways. The students discover that fossils are evidence of ancient life which is usually preserved in stone and that when most people think about fossils, they think about bones and skeletons. Students learn that not all fossils are the body parts of ancient organisms and that a very important type of fossil is called a trace fossil, scientifically termed an ichnofossil, the tracks or trails an organism leaves behind.

Greb, Stephen

108

Turtle Tracks  

NSDL National Science Digital Library

"One way to describe a geometric figure is in terms of the path generated by a moving point. Using the computer language LOGO, children can produce a list of commands to govern the motion of a 'turtle' and trace out a geometric track on the computer screen. Such a turtle can be programmed to generate an endless variety of patterns. Mathematicians can use similar algorithms to generate fractals and other forms. Certain sequences of moves produce patterns known as spirolaterals, which generate artistic forms of unexpected complexity and beauty, and can serve as idea generators for architects..."

Peterson, Ivars

2007-04-04

109

Automated Damage Onset Analysis Techniques Applied to KDP Damage and the Zeus Small Area Damage Test Facility  

SciTech Connect

Automated damage testing of KDP using LLNL's Zeus automated damage test system has allowed the statistics of KDP bulk damage to be investigated. Samples are now characterized by the cumulative damage probability curve, or S-curve, that is generated from hundreds of individual test sites per sample. A HeNe laser/PMT scatter diagnostic is used to determine the onset of damage at each test site. The nature of KDP bulk damage is such that each scatter signal may possess many different indicators of a damage event. Because of this, the determination of the initial onset for each scatter trace is not a straightforward affair and has required considerable manual analysis. The amount of testing required by crystal development for the National Ignition Facility (NIF) has made it impractical to continue analysis by hand. Because of this, we have developed and implemented algorithms for analyzing the scatter traces by computer. We discuss the signal cleaning algorithms and damage determination criteria that have lead to the successful implementation of a LabView based analysis code. For the typical R/1 damage data set, the program can find the correct damage onset in more than 80% of the cases, with the remaining 20% being left to operator determination. The potential time savings for data analysis is on the order of {approx} 100X over manual analysis and is expected to result in the savings of at least 400 man-hours over the next 3 years of NIF quality assurance testing.

Sharp, R.; Runkel, M.

1999-12-16

110

Automated damage onset analysis techniques applied to KDP damage and the Zeus small-area damage test facility  

NASA Astrophysics Data System (ADS)

Automated damage testing of KDP using LLNLs Zeus automated damage test system has allowed the statistics of KDP bulk damage to be investigated. Samples are now characterized by the cumulative damage probability curve, or S-curve, that is generated from hundreds of individual test sites per samples. A HeNe laser/PMT scatter diagnostic is used to determine the onset of damage at each test site. The nature of KDP bulk damage is such that each scatter signal may possess many different indicator of a damage event. Because of this, the determination of the initial onset for each scatter trace is not a straightforward affair and has required considerable manual analysis. The amount of testing required by crystal development for the National Ignition Facility (NIF) has made it impractical to continue analysis by hand. Because of this, we have developed and implemented algorithms for analyzing the scatter traces by computer. We discuss the signal cleaning algorithms and damage determination criteria that have lead to the successful implementation of a LabView based analysis code. For the typical R/1 damage data set, the program can find the correct damage onset in more than 80 percent of the cases, with the remaining 20 percent being left to operator determination. The potential time savings for data analysis is on the order of approximately 100 X over manual analysis and is expected to result in the savings of at least 400 man-hours over the next 3 years of NIF quality assurance testing.

Sharp, Richard; Runkel, Michael

2000-03-01

111

8. Launch closure, closure track apron, tracks and track beam, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. Launch closure, closure track apron, tracks and track beam, view towards west - Ellsworth Air Force Base, Delta Flight, Launch Facility D-6, 4 miles north of Badlands National Park Headquarters, 4.5 miles east of Jackson County line on county road, Interior, Jackson County, SD

112

On the Right Track.  

ERIC Educational Resources Information Center

|Suggests thinking of "tracks" as clues and using them as the focus of outdoor activities in the urban environment. Provides 24 examples of possible track activities, including: seeds on the ground (track of a nearby tree), litter (track of a litterbug), and peeling paint (track of weathering forces). (JN)|

Bieber, Ed

1983-01-01

113

Ocean Tracks  

NSDL National Science Digital Library

How are marine animals moving around when they are deep below the ocean's surface? It's a fascinating question, and one that has driven the work of part of Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO). On this website, visitors can see the "tracks" of selected marine animals tagged by CSIRO and partner agencies. It's an amazing experience, and visitors just need to download a small plug-in to get started. Some of the marine animals here include white sharks patrolling Australia's southern coast and bluefin tuna on their oceanic migrations. The About area is a great way to learn about the research and technology involved with this complicated endeavor. Also, visitors can check out the low-tech/accessible version of the site if they are so inclined.

114

Conversion from cyclosporine to everolimus at 4.5 months posttransplant: 3-year results from the randomized ZEUS study.  

PubMed

The long-term effect of conversion from calcineurin inhibitor (CNI) therapy to an mTOR inhibitor requires clarification. Following completion of the 12-month, open-label, multicenter ZEUS study, in which 300 kidney transplant recipients were randomized to continue cyclosporine (CsA) or convert to everolimus at 4.5 months posttransplant, outcomes were assessed at month 36 (n = 284; 94.7%). CNI therapy was reintroduced in 28.4% of everolimus patients by month 36. The primary efficacy endpoint, estimated glomerular filtration rate (Nankivell, ANCOVA) was significantly higher with everolimus versus the CsA group at month 24 (7.6 mL/min/1.73 m(2) , 95%CI 4.3, 11.0 mL/min/1.73 m(2) ; p < 0.001) and month 36 (7.5 mL/min/1.73 m(2) , 95%CI 3.6, 11.4 mL/min/1.73 m(2) ; p < 0.001). The incidence of biopsy-proven acute rejection from randomization to month 36 was 13.0% in the everolimus arm and 4.8% in the CsA arm (p = 0.015). Patient and graft survival, as well as incidences of malignancy, severe infections and hospitalization, were similar between groups. Kidney transplant patients who are converted from CsA to everolimus at month 4.5 and who remain on everolimus thereafter may achieve a significant improvement in renal function that is maintained to 3 years. There was a significantly higher rate of rejection in the everolimus arm but this did not exert a deleterious effect by 3 years posttransplant. PMID:22642473

Budde, K; Lehner, F; Sommerer, C; Arns, W; Reinke, P; Eisenberger, U; Wüthrich, R P; Scheidl, S; May, C; Paulus, E-M; Mühlfeld, A; Wolters, H H; Pressmar, K; Stahl, R; Witzke, O

2012-03-05

115

Can we track holes?  

PubMed Central

The evidence is mixed as to whether the visual system treats objects and holes differently. We used a multiple object tracking task to test the hypothesis that figural objects are easier to track than holes. Observers tracked four of eight items (holes or objects). We used an adaptive algorithm to estimate the speed allowing 75% tracking accuracy. In Experiments 1–5, the distinction between holes and figures was accomplished by pictorial cues, while red-cyan anaglyphs were used to provide the illusion of depth in Experiment 6. We variously used Gaussian pixel noise, photographic scenes, or synthetic textures as backgrounds. Tracking was more difficult when a complex background was visible, as opposed to a blank background. Tracking was easier when disks carried fixed, unique markings. When these factors were controlled for, tracking holes was no more difficult than tracking figures, suggesting that they are equivalent stimuli for tracking purposes.

Horowitz, Todd S.; Kuzmova, Yoana

2011-01-01

116

Laminated Track Pad for Tracked Vehicles.  

National Technical Information Service (NTIS)

This invention relates to an elastomeric track pad especially useful on the endless tracks of tanks and similar military vehicles. A particular object of the invention is to provide an elastomeric pad that at least partially avoids the problem of chunking...

R. L. Swarthout

1982-01-01

117

A comparison of the case flow management and case tracking systems of the Central Administrative Court of Thailand with those of the Federal Court of Australia, with reference to practice in the USA  

Microsoft Academic Search

Case flow management (CFM) is recognised as an essential component for the success of the overall management in contemporary courts. Case flow management programmes are adopted and implemented in many courts and tribunals across many nations to improve the courts? supervision of time and events from the beginning of cases to their finalisation. The case tracking system (CTS) is the

Natacha Vsindilok

2004-01-01

118

Fast Track (Prior Years)  

Center for Drug Evaluation (CDER)

... Fast Track (Prior Years). Fast Track Designation (FY 1998 - FY 2006). Within Goal, Overdue, FY, Granted, Denied, Total, Granted, ... More results from www.fda.gov/drugs/developmentapprovalprocess/howdrugsaredevelopedandapproved

119

GVPM Track & Suspension Overview.  

National Technical Information Service (NTIS)

This briefing presents the challenges facing the military in designing track and suspension systems for military vehicles. These challenges include : * Delivering lightweight, survivable, durable track systems with common architectures * Modular advanced ...

G. Bossio J. Alef

2011-01-01

120

Fast Track Approval Reports  

Center for Drug Evaluation (CDER)

... How Drugs are Developed and Approved. Drug and Biologic Approval Reports. Fast Track Approval Reports. -. Fast Track Approval Reports. -. ... More results from www.fda.gov/drugs/developmentapprovalprocess/howdrugsaredevelopedandapproved

121

Track design and construction  

SciTech Connect

The 8 papers in the report deal with the following areas: research railroad ballast specification and evaluation; a proposed track performance index for control of freight car harmonic roll response; granular depth requirement for railroad track; demonstration of the rail energy-cost-analysis package: the route perspective (RECAP II); techniques for controlling rail corrugation; the evolution of Washington Metro's track standards; track rehabilitation and new construction in an operating environment at BART; and, estimates of rail-transit construction costs.

Raymond, G.P.; Weinstock, H.; Lee, H.S.; Greif, R.; Scott, J.F.

1985-01-01

122

Tracking multiple manoeuvering targets in a network of passive radars  

Microsoft Academic Search

This paper addresses the problem of tracking multiple targets in a net of passive (angle only) 2D- of 3D-radar (azimuth or azimuth and elevation). No decentralised local bearing tracks are built, but measurements are fused on a central level. No signal or signal following information is used. We assume multiple coverage, high probability of detection and consider resolution conflicts of

R. Baltes; G. van Keuk

1995-01-01

123

27. INTERIOR VIEW OF DRAWTENDER'S SHACK LOOKING AT MAIN TRACK ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. INTERIOR VIEW OF DRAWTENDER'S SHACK LOOKING AT MAIN TRACK AND SIGNAL CONTROL LEVERS AND INDICATOR LIGHTS - Central Railroad of New Jersey, Newark Bay Lift Bridge, Spanning Newark Bay, Newark, Essex County, NJ

124

Tracking Groups of People  

Microsoft Academic Search

A computer vision system for tracking multiple people in relatively unconstrained environments is described. Tracking is performed at three levels of abstraction: regions, people and groups. A novel, adaptive background subtraction method that combines color and gradient information is used to cope with shadows and unreliable color cues. People are tracked through mutual occlusions as they form groups and separate

Stephen J. Mckenna; Sumer Jabri; Zoran Duric; Azriel Rosenfeld; Harry Wechsler

2000-01-01

125

Track and Field Facilities.  

ERIC Educational Resources Information Center

|Discusses planning and design tips that help ensure track and field facilities are successful and well-suited to both school and community use. Examines approaches to determining the best track surface and ways to maximize track and field flexibility with limited space. (GR)|

Wood, Tony

2001-01-01

126

Subpixel Eye Gaze Tracking  

Microsoft Academic Search

This paper addresses the accuracy problem of an eye gaze tracking system. We first analyze the technical barrier for a gaze tracking system to achieve desired accuracy, and then propose a subpixel tracking method to break the barrier. We present new algorithms for detecting the inner eye corner and the center of an iris in subpixel accuracy, and we apply

Jie Zhu; Jie Yang

2002-01-01

127

Occlusion resistant object tracking  

Microsoft Academic Search

Object tracking with occlusion prediction using multiple feature correspondences is proposed. The tracking region is defined by a set of point features, tracked using Kanade-Lucas-Tomasi (1991) algorithm. During total occlusion the region position is estimated using motion prediction based on a Kalman filtering scheme applied to the motion model prior to occlusion. During partial occlusion the displacements of the occluded

Evangelos Loutas; Ioannis Pitas; Konstantinos I. Diamantaras

2001-01-01

128

Calibration of the ZEUS Barrel Calorimeter in a Test Beam and a Direct Measurement of the J/psi Leptonic Branching Fraction.  

NASA Astrophysics Data System (ADS)

The ZEUS detector at the DESY e-p collider HERA has started collecting data. It contains a state-of-the -art fully compensating high resolution Uranium-scintillator calorimeter. The American part of the ZEUS collaboration was responsible for the construction of the 32 modules of the Barrel CALorimeter (BCAL) and the readout electronics for the complete calorimeter. A test beam experiment E790 was set up in a fixed-target beamline at Fermilab to test and calibrate the BCAL modules to 1%. The analysis of the test beam data with different incident beams at different energies showed a 1% tower-to-tower uniformity, studied the inter-module and inter-tower responses, and measured a hadron resolution of 35%/sqrt{E} (E in GeV), an electromagnetic resolution of 19%/ sqrt{E}. It also demonstrated the equality of the electromagnetic and the hadronic responses and the linearity of the responses of the calorimeter and the readout electronics. The Mark III collaboration has measured the J/ psi<=ptonic branching fractions using the process psi(3685) to pi^+pi^- J/psi,J/psi to l^+l^-. The results are: B(J/psi to e^+e^-) = (5.92 +/- 0.15 +/- 0.20)% and B(J/psi to mu ^+mu^-) = (5.90 +/- 0.15 +/- 0.19)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is (5.91 +/- 0.11 +/- 0.20)%. This result is used to obtain the strong coupling constant alpha_{s} and the QCD scale factor Lambda_{overline {MS}}.

Wang, Min-Zu.

129

Tropical Cyclones 1989 - Central North Pacific.  

National Technical Information Service (NTIS)

Contents: Central north pacific tropical cyclone data 1989; Tropical depression FOUR-E and FIVE-E; Hurricane Dalilia; Hurricane Dalilia - actual vs best track error; Hurricane Dalilia - 24 hour forecast verification; Hurricane Dalilia - 36 hour forecast v...

A. K. T. Chun R. T. Martin H. E. Rosendal

1990-01-01

130

SILEX acquisition and tracking sensors  

NASA Astrophysics Data System (ADS)

This paper describes the Acquisition Sensor Detection Unit (ASDU) and the Tracking Sensor Detection Unit (TSDU) developed by Sira Ltd to be flown in the European Space Agency's SILEX (Semi-conductor Inter satellite Link Experiment) terminals. These units were designed, manufactured and qualified by Sira under contract to Matra Marconi Space. Stringent vibration, thermal stability and video waveform noise and timing specifications were critical elements in the design. The ASDU consists of an optical head containing a 385 X 288 CCD and video buffer, and separate electronics box containing clock decoding electronics, CCD clock drivers and video amplifiers. The ASDU operates at a frame rate of 33 or 135 Hz and its noise performance allows the brightest pixel to be detected with an accuracy of +/- 0.5 pixel for input powers in the range 9 - 55 pW (33 Hz) or 16 - 240 pW (135 Hz) during acquisition. Using the ASDU signal, the SILEX pointing, acquisition and tracking system controls the pointing mirrors to centralize the beam, at which point it falls within the smaller TSDU field of view. The TSDU comprises a single 480 g unit containing a 43 mm focal length lens, a 14 X 14 CCD, and clock receiver and video amplifier electronics. During tracking the central 4 CCD pixels are used as a quadrant detector, and the TSDU has demonstrated a noise equivalent angle of 2.7 (mu) rad (1 (sigma) half cone, 180 pW optical input power) at a frame rate of 8 kHz.

Cockshott, Robert A.; Purll, David J.

1995-04-01

131

Sea Turtle Satellite Tracking  

NSDL National Science Digital Library

Near real-time tool for collecting, managing and sharing marine life satellite tracking data. Over 30 projects in US, Caribbean, Mediterranean, Indo-Pacific, and Australian waters. Provides links to background information for each project, the animals they are tracking, and maps that are updated regularly. Teaching resources include maps for tracking, suggestions for using data in lessons on geography, biology, earth science, math. Good introduction to satellite telemetry methodology and applications.

132

Tunable Kernels for Tracking  

Microsoft Academic Search

We present a tunable representation for tracking that si- multaneously encodes appearance and geometry in a man- ner that enables the use of mean-shift iterations for track- ing. The classic formulation of the tracking problem us- ing mean-shift iterations encodes spatial information very loosely (i.e. using radially symmetric kernels). A prob- lem with such a formulation is that it becomes

Vasu Parameswaran; Visvanathan Ramesh; Imad Zoghlami

2006-01-01

133

Tracking toxic chemicals  

NASA Astrophysics Data System (ADS)

A new report tracking industrial pollution in North America indicates some good news, in terms of downward trends in the release and transfer of these substances.The July report, which tracks 165 chemicals released in the United States and Canada, shows that the total amount of 3.2 million tonnes of chemical releases and transfers from industrial facilities tracked by the North American Commission for Environmental Cooperation (CEC) decreased by 2% overall from 1995 to 1998.

Showstack, Randy

134

3D Track Triggering at CDF  

NASA Astrophysics Data System (ADS)

In order to account for increased luminosity in the Tevatron at Fermilab, an upgrade of the Level 1 tracking system at CDF is necessary. The CDF detector utilizes a Central Outer Tracker (COT), which consists of 96 layers of wires arranged in 8 superlayers that provide information on the momentum and trajectory of charged particles created in collisions between protons and anti-protons. The COT alternates between axial superlayers which provide tracking information only in directions transverse to the beam-line and stereo superlayers that also provide tracking information parallel to the beam-line. The eXtremely Fast Tracker (XFT) is responsible for Level 1 track finding, and is currently only using axial data to reconstruct tracks at CDF. The XFT upgrade involves the addition of the Stereo Linker Association Module (SLAM). The SLAM will utilize the previously existing XFT setup as well as information from the stereo superlayers in the COT to identify useful 3-dimensional tracks. I will give an overview of the hardware configuration and describe the SLAM pattern recognition algorithms.

Parks, Brandon

2006-04-01

135

Tracking in Anatomic Pathology.  

PubMed

Bar code-based tracking solutions, long present in clinical pathology laboratories, have recently made an appearance in anatomic pathology (AP) laboratories. Tracking of AP "assets" (specimens, blocks, slides) can enhance laboratory efficiency, promote patient safety, and improve patient care. Routing of excess clinical material into research laboratories and biorepositories are other avenues that can benefit from tracking of AP assets. Implementing tracking is not as simple as installing software and turning it on. Not all tracking solutions are alike. Careful analysis of laboratory workflow is needed before implementing tracking to assure that this solution will meet the needs of the laboratory. Such analysis will likely uncover practices that may need to be modified before a tracking system can be deployed. Costs that go beyond simply that of purchasing software will be incurred and need to be considered in the budgeting process. Finally, people, not technology, are the key to assuring quality. Tracking will require significant changes in workflow and an overall change in the culture of the laboratory. Preparation, training, buy-in, and accountability of the people involved are crucial to the success of this process. This article reviews the benefits, available technology, underlying principles, and implementation of tracking solutions for the AP and research laboratory. PMID:23634908

Pantanowitz, Liron; Mackinnon, Alexander C; Sinard, John H

2013-05-01

136

Tracking Small Artists  

NASA Astrophysics Data System (ADS)

Tracks of small animals are important in environmental surveillance, where pattern recognition algorithms allow species identification of the individuals creating tracks. These individuals can also be seen as artists, presented in their natural environments with a canvas upon which they can make prints. We present tracks of small mammals and reptiles which have been collected for identification purposes, and re-interpret them from an esthetic point of view. We re-classify these tracks not by their geometric qualities as pattern recognition algorithms would, but through interpreting the 'artist', their brush strokes and intensity. We describe the algorithms used to enhance and present the work of the 'artists'.

Russell, James C.; Klette, Reinhard; Chen, Chia-Yen

137

Combination of H1 and ZEUS Inclusive Deep Inelastic e{sup {+-}}p Scattering Cross Section Measurements and Extraction of the Proton Parton Density Functions using a NLO-QCD Fit  

SciTech Connect

A new averaging method is used to combine previously published HERA-I data by the H1 and ZEUS Collaborations of neutral and charged current inclusive cross sections for e{sup {+-}}p scattering. The combination procedure takes into account the systematic error correlations in a coherent approach, leading to a significantly reduced overall cross section uncertainty. This precise combined HERA-I data set is then used as the sole input for a next-to-leading order (NLO) QCD parton distribution function (PDF) fit. The consistent treatment of systematic uncertainties in the combined data results in PDFs with greatly reduced experimental uncertainties compared to the separate analyses of the H1 and ZEUS experiments. Model uncertainties, including those arising from parametrisation dependence, are also carefully considered. The resulting HERAPDFs have impressive precision compared to the global fits.

Radescu, Voica A. [DESY, Notkestrasse 85, 22607 Hamburg (Germany)

2009-03-23

138

Collaborative tracking for robotic tasks  

Microsoft Academic Search

This paper describes how to integrate tracking functions on a mobile robot. Tracking is required during autonomous robot navigation in different situations: landmark tracking to guarantee real-time robot localization, target tracking for a sensor based motion or obstacle tracking to control an obstacle avoidance procedure. These objects - landmarks, targets, and obstacles - have different characteristics: this paper shows that

A. Marin-Hernandez; V. Ayala-Ramirez; Michel Devy

2003-01-01

139

Intelligent tracking techniques  

Microsoft Academic Search

This is the Second Quarterly Report under a contract to investigate the design, test, and implementation of a set of algorithms to perform intelligent tracking and intelligent target homing on FLIR and TV Imagery. The intelligent tracker will monitor the entire field of view, detect and classify targets, perform multiple target tracking and predict changes in target signature prior to

T. J. Willett

1979-01-01

140

Mobile RFID Tracking System  

Microsoft Academic Search

This paper describes the design of an RFID kids tracking system. It is designed to track a moving child in a wide area, such as a park or mall, using RFID technology. The proposed system has hardware and software components. The hardware architecture consists of an RFID active tag, RFID tag reader, Web server and database server. The Web server

A. R. Al-Ali; Fadi A. Aloul; Nada R. Aji; Amin A. Al-Zarouni; Nassar H. Fakhro

2008-01-01

141

Tracking Objects Using Recognition  

Microsoft Academic Search

Tracking is frequently considered a frame-to-frame op- eration. As such, object recognition techniques are gener- ally too slow to be used for tracking. There are domains, however, where the objects of interest do not move most of the time. In these domains, it is possible to watch for activity in the scene and then apply object recognition tech- niques to

Randal C. Nelson; Isaac A. Green

2002-01-01

142

2 Tracks for Faculty  

ERIC Educational Resources Information Center

|The academic work force has been transformed over the past several decades, less by design than out of expediency. In 1969, professors who were either tenured or tenure-track made up 78 percent of the faculty. Those working part time made up only 18.5 percent. By 2009, those proportions had almost flipped, with tenured and tenure-track making up…

Wilson, Robin

2012-01-01

143

Static compressive tracking  

Microsoft Academic Search

This paper presents the Static Computational Optical Undersampled Tracker (SCOUT), an architecture for compressive motion tracking systems. The architecture uses compressive sensing techniques to track moving targets at significantly higher resolution than the detector array, allowing for low cost, low weight design and a significant reduction in data storage and bandwidth requirements. Using two amplitude masks and a standard focal

D. J. Townsend; P. K. Poon; S. Wehrwein; T. Osman; A. V. Mariano; E. M. Vera; M. D. Stenner; M. E. Gehm

2012-01-01

144

Can Tracking Improve Learning?  

ERIC Educational Resources Information Center

|Tracking students into different classrooms according to their prior academic performance is controversial among both scholars and policymakers. If teachers find it easier to teach a homogeneous group of students, tracking could enhance school effectiveness and raise test scores of both low- and high-ability students. If students benefit from…

Duflo, Esther; Dupas, Pascaline; Kremer, Michael

2009-01-01

145

Explaining cloud chamber tracks  

SciTech Connect

The operation of many detection devices is usually explained in terms of the ionization tracks produced by particles despite the fact that the corresponding incident wave functions extended over the entire sensitive regions of the detectors. The mechanisms by which the wave function appears to collapse to a track is analyzed here.

Broyles, A.A.

1992-06-16

146

Longwall shearer tracking system  

Microsoft Academic Search

A tracking system for measuring and recording the movements of a longwall shearer vehicle includes an optical tracking assembly carried at one end of a desired vehicle path and a retroreflector assembly carried by the vehicle. Continuous horizontal and vertical light beams are alternately transmitted by means of a rotating Dove prism to the reflector assembly. A vertically reciprocating reflector

P. D. Poulsen; R. J. Stein; R. E. Pease

1984-01-01

147

Fast track project management  

Microsoft Academic Search

The author presents an approach to project management and cement plant construction, which, without sacrificing cost and quality, has produced fast track schedule results. It is pointed out that it nearly is a general situation that project schedules slip for justified or unjustified reasons. The author analyzes these reasons in order to turn them around and to obtain fast track

F. Van Der Linden

1991-01-01

148

Graphs and Tracks Model  

NSDL National Science Digital Library

The Graphs and Tracks Model allows instructors to create custom models of a ball rolling on a track with a variable shape. This EJS model was inspired by the Graphs and Tracks program by David Trowbridge. Instructors set the heights of the track segments and the model displays the motion of the ball. Optional displays, including position and velocity graphs, energy graphs, and data tables, can be added depending on the learning goals for the activity. Documents can aslo be added to the model to provide student instructions or activities. The customized simulation is then saved as a new jar file that can be redistributed. The Graphs and Tracks Model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the jar file will run the program if Java is installed.

Christian, Wolfgang; Belloni, Mario

2012-05-30

149

Tracking fast neutrons  

NASA Astrophysics Data System (ADS)

Both neutron absorption and elastic scattering can be used to measure neutron momentum. Based on elastic collisions, the linear momentum of a fast neutron can be measured from as few as two consecutive recoil ion tracks plus the vertex position of the third collision, or 'two and half' ion tracks. If the time delay between the first two consecutive ion tracks is also measured, the number of ion tracks can be reduced to one and a half. The angular and magnitude resolutions are limited by ion range straggling to about 10%. Multi-wire proportional chambers and light-field imaging can be used for fast neutron tracking. Light-field imaging is free of charge-diffusion-induced image blur, but the limited number of photons available can be a challenge. 1H, 2H and 3He could be used for the initial development of fast neutron trackers based on light-field imaging.

Wang, Zhehui; Morris, Christopher L.

2013-10-01

150

Online track processor for the CDF upgrade  

SciTech Connect

A trigger track processor, called the eXtremely Fast Tracker (XFT), has been designed for the CDF upgrade. This processor identifies high transverse momentum (> 1.5 GeV/c) charged particles in the new central outer tracking chamber for CDF II. The XFT design is highly parallel to handle the input rate of 183 Gbits/s and output rate of 44 Gbits/s. The processor is pipelined and reports the result for a new event every 132 ns. The processor uses three stages: hit classification, segment finding, and segment linking. The pattern recognition algorithms for the three stages are implemented in programmable logic devices (PLDs) which allow in-situ modification of the algorithm at any time. The PLDs reside on three different types of modules. The complete system has been installed and commissioned at CDF II. An overview of the track processor and performance in CDF Run II are presented.

E. J. Thomson et al.

2002-07-17

151

Extrapolating target tracks  

NASA Astrophysics Data System (ADS)

Steady-state performance of a tracking filter is traditionally evaluated immediately after a track update. However, there is commonly a further delay (e.g., processing and communications latency) before the tracks can actually be used. We analyze the accuracy of extrapolated target tracks for four tracking filters: Kalman filter with the Singer maneuver model and worst-case correlation time, with piecewise constant white acceleration, and with continuous white acceleration, and the reduced state filter proposed by Mookerjee and Reifler.1, 2 Performance evaluation of a tracking filter is significantly simplified by appropriate normalization. For the Kalman filter with the Singer maneuver model, the steady-state RMS error immediately after an update depends on only two dimensionless parameters.3 By assuming a worst case value of target acceleration correlation time, we reduce this to a single parameter without significantly changing the filter performance (within a few percent for air tracking).4 With this simplification, we find for all four filters that the RMS errors for the extrapolated state are functions of only two dimensionless parameters. We provide simple analytic approximations in each case.

Van Zandt, James R.

2012-05-01

152

Satellite Tracking Threatened Species  

NSDL National Science Digital Library

The Patuxent Wildlife Research Center and NASA's Goddard Space Flight Center have combined forces to produce this Website on the use of satellite tracking to monitor migration routes of endangered birds. Targeting the general public, the site introduces readers to satellite tracking (using Direct Readout technology), offers animations of bird flight paths (see the section entitled Birdtracks), and gives additional information on birds (in the Bird Data Archives, select a bird and watch its flight path through time). While bird information is limited to several larger species (due to the size/weight of attached transmitters), the resource serves as a useful information base for anyone wishing to learn more about satellite tracking.

153

Railway track allocation: models and methods  

Microsoft Academic Search

Efficiently coordinating the movement of trains on a railway network is a central part of the planning process for a railway\\u000a company. This paper reviews models and methods that have been proposed in the literature to assist planners in finding train\\u000a routes. Since the problem of routing trains on a railway network entails allocating the track capacity of the network

Richard M. Lusby; Jesper Larsen; Matthias Ehrgott; David Ryan

154

Deep inelastic inclusive and diffractive scattering at Q values from 25 to 320 GeV2 with the ZEUS forward plug calorimeter  

NASA Astrophysics Data System (ADS)

Deep inelastic scattering and its diffractive component, ep?e?p?eXN, have been studied at HERA with the ZEUS detector using an integrated luminosity of 52.4 pb-1. The M method has been used to extract the diffractive contribution. A wide range in the centre-of-mass energy W (37 245 GeV), photon virtuality Q (20 450 GeV2) and mass M (0.28 35 GeV) is covered. The diffractive cross section for 2

ZEUS Collaboration; Chekanov, S.; Derrick, M.; Magill, S.; Musgrave, B.; Nicholass, D.; Repond, J.; Yoshida, R.; Mattingly, M. C. K.; Jechow, M.; Pavel, N.; Antonioli, P.; Bari, G.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cindolo, F.; Corradi, M.; Iacobucci, G.; Margotti, A.; Nania, R.; Polini, A.; Antonelli, S.; Basile, M.; Bindi, M.; Cifarelli, L.; Contin, A.; de Pasquale, S.; Sartorelli, G.; Zichichi, A.; Bartsch, D.; Brock, I.; Hartmann, H.; Hilger, E.; Jakob, H.-P.; Jüngst, M.; Nuncio-Quiroz, A. E.; Paul, E.; Renner, R.; Samson, U.; Schönberg, V.; Shehzadi, R.; Wlasenko, M.; Brook, N. H.; Heath, G. P.; Morris, J. D.; Capua, M.; Fazio, S.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Tassi, E.; Kim, J. Y.; Ibrahim, Z. A.; Kamaluddin, B.; Wan Abdullah, W. A. T.; Ning, Y.; Ren, Z.; Sciulli, F.; Chwastowski, J.; Eskreys, A.; Figiel, J.; Galas, A.; Gil, M.; Olkiewicz, K.; Stopa, P.; Zawiejski, L.; Adamczyk, L.; Bo?d, T.; Grabowska-Bo?d, I.; Kisielewska, D.; ?ukasik, J.; Przybycie?, M.; Suszycki, L.; Kota?ski, A.; S?omi?ski, W.; Behrens, U.; Blohm, C.; Bonato, A.; Borras, K.; Ciesielski, R.; Coppola, N.; Drugakov, V.; Fang, S.; Fourletova, J.; Geiser, A.; Göttlicher, P.; Grebenyuk, J.; Gregor, I.; Haas, T.; Hain, W.; Hüttmann, A.; Kahle, B.; Kasemann, M.; Katkov, I. I.; Klein, U.; Kötz, U.; Kowalski, H.; Lim, H.; Lobodzinska, E.; Löhr, B.; Mankel, R.; Melzer-Pellmann, I.-A.; Miglioranzi, S.; Montanari, A.; Namsoo, T.; Notz, D.; Parenti, A.; Rinaldi, L.; Roloff, P.; Rubinsky, I.; Santamarta, R.; Schneekloth, U.; Spiridonov, A.; Szuba, D.; Szuba, J.; Theedt, T.; Wolf, G.; Wrona, K.; Yagües Molina, A. G.; Youngman, C.; Zeuner, W.; Lohmann, W.; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Bamberger, A.; Dobur, D.; Karstens, F.; Vlasov, N. N.; Bussey, P. J.; Doyle, A. T.; Dunne, W.; Forrest, M.; Rosin, M.; Saxon, D. H.; Skillicorn, I. O.; Gialas, I.; Papageorgiu, K.; Holm, U.; Klanner, R.; Lohrmann, E.; Schleper, P.; Schörner-Sadenius, T.; Sztuk, J.; Stadie, H.; Turcato, M.; Foudas, C.; Fry, C.; Long, K. R.; Tapper, A. D.; Matsumoto, T.; Nagano, K.; Tokushuku, K.; Yamada, S.; Yamazaki, Y.; Barakbaev, A. N.; Boos, E. G.; Pokrovskiy, N. S.; Zhautykov, B. O.; Aushev, V.; Borodin, M.; Kozulia, A.; Lisovyi, M.; Son, D.; de Favereau, J.; Piotrzkowski, K.; Barreiro, F.; Glasman, C.; Jimenez, M.; Labarga, L.; Del Peso, J.; Ron, E.; Soares, M.; Terrón, J.; Zambrana, M.; Corriveau, F.; Liu, C.; Schwartz, J.; Walsh, R.; Zhou, C.; Tsurugai, T.; Antonov, A.; Dolgoshein, B. A.; Gladkov, D.; Sosnovtsev, V.; Stifutkin, A.; Suchkov, S.; Dementiev, R. K.; Ermolov, P. F.; Gladilin, L. K.; Golubkov, Yu. A.; Khein, L. A.; Korzhavina, I. A.; Kuzmin, V. A.; Levchenko, B. B.; Lukina, O. Yu.; Proskuryakov, A. S.; Shcheglova, L. M.; Zotkin, D. S.; Abt, I.; Büttner, C.; Caldwell, A.; Kollar, D.; Reisert, B.; Schmidke, W. B.; Sutiak, J.; Grigorescu, G.; Keramidas, A.; Koffeman, E.; Kooijman, P.; Pellegrino, A.; Tiecke, H.; Vázquez, M.; Wiggers, L.; Brümmer, N.; Bylsma, B.; Durkin, L. S.; Lee, A.; Ling, T. Y.; Allfrey, P. D.; Bell, M. A.; Cooper-Sarkar, A. M.; Devenish, R. C. E.; Ferrando, J.; Foster, B.; Korcsak-Gorzo, K.; Oliver, K.; Patel, S.; Roberfroid, V.; Robertson, A.; Straub, P. B.; Uribe-Estrada, C.; Walczak, R.; Bertolin, A.; Dal Corso, F.; Dusini, S.; Longhin, A.; Stanco, L.; Bellan, P.; Brugnera, R.; Carlin, R.; Garfagnini, A.; Limentani, S.; Oh, B. Y.; Raval, A.; Ukleja, J.; Whitmore, J. J.; Iga, Y.; D'Agostini, G.; Marini, G.; Nigro, A.; Cole, J. E.; Hart, J. C.; Gabareen, A.; Ingbir, R.; Kananov, S.; Smith, O.; Stern, A.; Kuze, M.; Maeda, J.; Hori, R.; Kagawa, S.; Okazaki, N.; Shimizu, S.; Tawara, T.; Hamatsu, R.; Kaji, H.; Kitamura, S.; Ota, O.; Ri, Y. D.; Costa, M.; Ferrero, M. I.; Monaco, V.; Sacchi, R.; Solano, A.; Arneodo, M.; Ruspa, M.; Fourletov, S.; Martin, J. F.; Stewart, T. P.; Boutle, S. K.; Butterworth, J. M.; Gwenlan, C.; Jones, T. W.; Loizides, J. H.; Wing, M.; Brzozowska, B.; Ciborowski, J.; Grzelak, G.; Kulinski, P.; ?u?niak, P.; Malka, J.; Nowak, R. J.; Pawlak, J. M.; Tymieniecka, T.; Ukleja, A.; ?arnecki, A. F.; Adamus, M.; Plucinski, P.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Brownson, E.; Danielson, T.; Everett, A.; Kçira, D.; Reeder, D. D.; Ryan, P.; Savin, A. A.; Smith, W. H.; Wolfe, H.; Bhadra, S.; Catterall, C. D.; Cui, Y.; Hartner, G.; Menary, S.; Noor, U.; Standage, J.; Whyte, J.

2008-09-01

155

Adaptive Arrays and Tracking.  

National Technical Information Service (NTIS)

Adaptive arrays and tracking share many concepts mathematical tools, practical issues, and algorithms. For example, ill-conditioning of the sample covariance matrix for adaptive arrays and ill-conditioning of the covariance matrix in a Kalman filter are b...

F. E. Daum

2004-01-01

156

Indexed Bibliography on Tracking.  

National Technical Information Service (NTIS)

This document comprises a bibliography about tracking and related literature, with corresponding documentation in the form of indexed author and subject listings. Indexing was performed to enhance its utility as a reference. Topical subjects were distingu...

S. P. Schipani

1990-01-01

157

Adaptive Tracking System Study.  

National Technical Information Service (NTIS)

The application of LMS adaptive filters to bearing tracking was investigated for sum and splitbeam bearing trackers, and a specific splitbeam adaptive tracker algorithm was selected. The adaptive tracker does not require a prior information regarding the ...

P. L. Feintuch F. A. Reed N. J. Bershad B. Repasky

1978-01-01

158

Tracked-Vehicle Transportability.  

National Technical Information Service (NTIS)

This document describes the procedures for evaluating the transportability characteristics of tracked vehicles moving under their own power, or moved by carrier over highway, off-road terrain, rail, water, or by air. Keywords: Crane, Dynamometer, Lifting ...

1987-01-01

159

Tracking Sea Otters  

USGS Multimedia Gallery

USGS sea otter researcher Tim Tinker drives the boat on an expedition to track and observe sea otters in Monterey Bay, California. USGS scientists study sea otters in efforts to help the threatened species continue to recover from near extinction....

160

Energy Tracking Software Platform  

SciTech Connect

Acceleration has created an interactive energy tracking and visualization platform that supports decreasing electric, water, and gas usage. Homeowners have access to tools that allow them to gauge their use and track progress toward a smaller energy footprint. Real estate agents have access to consumption data, allowing for sharing a comparison with potential home buyers. Home builders have the opportunity to compare their neighborhood's energy efficiency with competitors. Home energy raters have a tool for gauging the progress of their clients after efficiency changes. And, social groups are able to help encourage members to reduce their energy bills and help their environment. EnergyIT.com is the business umbrella for all energy tracking solutions and is designed to provide information about our energy tracking software and promote sales. CompareAndConserve.com (Gainesville-Green.com) helps homeowners conserve energy through education and competition. ToolsForTenants.com helps renters factor energy usage into their housing decisions.

Ryan Davis; Nathan Bird; Rebecca Birx; Hal Knowles

2011-04-04

161

Robust Facial Feature Tracking  

Microsoft Academic Search

We present a robust technique for tracking a set of pre-determined points on a human face. To achieve robustness, the Kanade-Lucas-Tomasi point tracker is extended and specialised to work on facial features by embedding knowledge about the configuration and visual characteristics of the face. The resulting tracker is designed to recover from the loss of points caused by tracking drift

Fabrice Bourel; Claude C. Chibelushi; Adrian A. Low

2000-01-01

162

Reducing antenna mechanical noise in precision spacecraft tracking  

Microsoft Academic Search

Doppler tracking of deep space probes is central to spacecraft navigation and many radio science investigations. The most sensitive Doppler observations to date were taken using the NASA\\/JPL Deep Space Network antenna DSS 25 (a 34 m diameter beam-waveguide station instrumented with simultaneous X- and Ka-band uplink and tropospheric scintillation calibration equipment) tracking the Cassini spacecraft. Those observations achieved Doppler

J. W. Armstrong; F. B. Estabrook; S. W. Asmar; L. Iess; P. Tortora

2008-01-01

163

Reducing Antenna Mechanical Noise in Precision Doppler Tracking  

Microsoft Academic Search

Precision Doppler tracking of deep-space probes is central to spacecraft naviga- tion and many radio science investigations. The most sensitive Doppler observa- tions to date have been taken using the NASA\\/JPL Deep Space Network (DSN) antenna DSS 25—a 34-m-diameter beam-waveguide station especially instrumented with simultaneous X-band (?8.4-GHz) and Ka-band (?32-GHz) links and tropo- spheric scintillation calibration equipment—tracking the Cassini spacecraft.

J. W. Armstrong; F. B. Estabrook; S. W. Asmar; L. Iess; P. Tortora

2006-01-01

164

A novel method for retinal vessel tracking using particle filters.  

PubMed

Extraction of a proper map from the vessel paths in the retinal images is a prerequisite for many applications such as identification. In this paper, we present a new approach based on particle filtering to determine and locally track the vessel paths in retina. Particle filter needs to use an acceptable probability density function (PDF) describing the blood vessels which must be provided by the retinal image. For this purpose, the product of the green and blue channels of the RGB retinal images is considered and after a median filtering stage, it is used as a PDF for tracking procedure. Then a stage of optic disc localization is performed to localize the starting points around the optic disc. With a proper set of starting points, the iterative tracking procedure initiates. First, a uniform propagation of the particles on an annular ring around each point (including starting points or ones determined as central points in the previous iteration) is performed. The particle weights are evaluated and accordingly, each particle is decided to be inside or outside the vessel. The subsequent stage is to analyze the hypothetical vectors between a central point and each of the inside vessel particles to find ones located inside vessel. Afterwards, the particles are clustered using quality threshold clustering method. Finally, each cluster introduces a central point for pursuing the tracking procedure in the next iteration. The tracking proceeds towards a bifurcation or the end of the vessels. We introduced two criteria: automatic/manually tracked ratio (AMTR) and false/manually tracked ratio (FMTR) for evaluating the tracking results. Apart from the labeling accuracy, the average values of AMTR and FMTR were 0.7746 and 0.2091, respectively. The proposed method successfully deals with the bifurcations with robustness against noise and tracks the thin vessels. PMID:23434235

Nayebifar, B; Abrishami Moghaddam, H

2013-02-21

165

Algorithm for multiple faces tracking  

Microsoft Academic Search

Robust real-time face tracking is a challenging task. This paper presents an algorithm for tracking faces of multiple people even in case of total occlusion. The method uses the color distribution of each face with the mean shift tracking method. Mean shift tracking is fast and robust to partial occlusion, and it is rotation invariant and computationally efficient. Since the

Charay Lerdsudwichai; Mohamed Abdel-Mottaleb

2003-01-01

166

NASA: Satellite Tracking  

NSDL National Science Digital Library

While NASA has offered a number of fine sites about their research for the general public over the years, this particular site may be one of their best. With a minimum of fuss, visitors can use several of the online tracking applications offered here to locate hundreds of satellites and other such large objects in space. A good way to start a visit to this site is by taking a look at the J-Track 2.5 section, as it offers a quick way to find out the current location of the Space Station and the Chandra X-Ray Observatory. Additionally, visitors can also locate weather satellites using this application. The Live 3D Java Tracking Display here allows visitors to monitor close to 700 satellites that are in motion around the earth. Finally, visitors can also use a handy application offered here that allows them to determine which satellites might be seen from their location in the night sky.

2005-01-01

167

7.RP Track Practice  

NSDL National Science Digital Library

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Angel and Jayden were at track practice. The track is $\\frac25$ kilometers around. Angel ran 1 lap in 2 minutes. Jayden ran 3 laps in 5 minutes. How ma...

168

Computationally efficient Bayesian tracking  

NASA Astrophysics Data System (ADS)

In this paper, we describe the progress we have achieved in developing a computationally efficient, grid-based Bayesian fusion tracking system. In our approach, the probability surface is represented by a collection of multidimensional polynomials, each computed adaptively on a grid of cells representing state space. Time evolution is performed using a hybrid particle/grid approach and knowledge of the grid structure, while sensor updates use a measurement-based sampling method with a Delaunay triangulation. We present an application of this system to the problem of tracking a submarine target using a field of active and passive sonar buoys.

Aughenbaugh, Jason; La Cour, Brian

2012-05-01

169

Cell tracking using nanoparticles.  

PubMed

Tracking cells in regenerative medicine is becoming increasingly important for basic cell therapy science, for cell delivery optimization and for accurate biodistribution studies. This report describes nanoparticles that utilize stable-isotope metal labels for multiple detection technologies in preclinical studies. Cells labeled with nanoparticles can be imaged by electron microscopy, fluorescence, and magnetic resonance. The nanoparticle-labeled cells can be quantified by neutron activation, thereby allowing, with the use of standard curves, the determination of the number of labeled cells in tissue samples from in vivo sources. This report describes the characteristics of these nanoparticles and methods for using these nanoparticles to label and track cells. PMID:20559922

Vaccaro, Dennis E; Yang, Meiheng; Weinberg, James S; Reinhardt, Christopher P; Groman, Ernest V

2008-07-08

170

Spin tracking in RHIC  

SciTech Connect

In the acceleration of polarized protons in RHIC many spin depolarizing resonances are encountered. Helical Siberian snakes will be used to overcome depolarizing effects. The behavior of polarization can be studied by numerical tracking in a model accelerator. That allows one to check the strength of the resonances, to study the effect of snakes, to find safe lattice tune regions, and finally to study the operation of special devices like spin flippers. In this paper the authors describe numerical spin tracking. Results show that, for the design corrected distorted orbit and the design beam emittance, the polarization of the beam will be preserved in the whole range of proton energies in RHIC.

Luccio, A.U. [Brookhaven National Lab., Upton, NY (United States); Katayama, T. [Univ. of Tokyo (Japan); Wu, H. [Riken Inst., Tokyo (Japan)

1997-07-01

171

Simple front tracking  

SciTech Connect

A new and simplified front tracking algorithm has been developed as an aspect of the extension of this algorithm to three dimensions. Here the authors emphasize two main results: (1) a simplified description of the microtopology of the interface, based on interface crossings with cell block edges, and (2) an improved algorithm for the interaction of a tracked contact discontinuity with an untracked shock wave. For the latter question, they focus on the post interaction jump at the contact, which is a purely 1D issue. Comparisons to other methods, including the level set method, are included.

Glimm, J.; Grove, J.W.; Li, X.; Zhao, N.

1999-04-01

172

Position domain joint tracking  

Microsoft Academic Search

It was shown that the Vector Delay Lock Loop (VDLL) enhances the robustness of a GNSS receiver by exploiting the spatial correlation of the received signals. But due to the periodicity of the carrier, the VDLL only operates on the codephase and the carrier-frequency. In contrast to the VDLL, the Joint Tracking receiver manages to sustain the carrier-phase lock even

Kaspar Giger; C. Gu?nther

2010-01-01

173

Static compressive tracking.  

PubMed

This paper presents the Static Computational Optical Undersampled Tracker (SCOUT), an architecture for compressive motion tracking systems. The architecture uses compressive sensing techniques to track moving targets at significantly higher resolution than the detector array, allowing for low cost, low weight design and a significant reduction in data storage and bandwidth requirements. Using two amplitude masks and a standard focal plane array, the system captures many projections simultaneously, avoiding the need for time-sequential measurements of a single scene. Scenes with few moving targets on static backgrounds have frame differences that can be reconstructed using sparse signal reconstruction techniques in order to track moving targets. Simulations demonstrate theoretical performance and help to inform the choice of design parameters. We use the coherence parameter of the system matrix as an efficient predictor of reconstruction error to avoid performing computationally intensive reconstructions over the entire design space. An experimental SCOUT system demonstrates excellent reconstruction performance with 16X compression tracking movers on scenes with zero and nonzero backgrounds. PMID:23037240

Townsend, D J; Poon, P K; Wehrwein, S; Osman, T; Mariano, A V; Vera, E M; Stenner, M D; Gehm, M E

2012-09-10

174

Spiral track oven  

SciTech Connect

Final report on development of a continuously operating oven system in which the parts are progressing automatically on a spiral track for in-line service installation for the production of electronic and/or other components to be heat cured or dried.

Drobilisch, Sandor

1998-12-20

175

Passive Radar Tracking Apparatus.  

National Technical Information Service (NTIS)

The radar system tracks a target whether it generates a signal of its own or not and may be used to sense noise energy radiated by the sun, other objects, or other celestial bodies. The system includes an antenna assembly of four horns arranged in a recta...

D. K. Barton W. J. Rose

1965-01-01

176

Minimum Tracking Error Volatility  

Microsoft Academic Search

Investors assign part of their funds to asset managers that are given the task of beating a benchmark. The risk management department usually imposes a maximum value of the tracking error volatility (TEV) in order to keep the risk of the portfolio near to that of the selected benchmark. However, risk management does not establish a rule on TEV which

Luca RICCETTI

2010-01-01

177

Tracking Speech Sound Acquisition  

ERIC Educational Resources Information Center

|This article describes a procedure to aid in the clinical appraisal of child speech. The approach, based on the work by Dinnsen, Chin, Elbert, and Powell (1990; Some constraints on functionally disordered phonologies: Phonetic inventories and phonotactics. "Journal of Speech and Hearing Research", 33, 28-37), uses a railway idiom to track gains…

Powell, Thomas W.

2011-01-01

178

Adaptive angle tracking  

Microsoft Academic Search

Angle tracking with phased array antennas in an external noise environment was studied. While the results of this study are applicable generally to arrays of sensors for measuring the angle of arrival of incident radiation, the emphasis in the simulation portion of the study was placed on radar arrays operating in a jamming environment. This problem is important in a

L. E. Brennan; I. S. Reed

1975-01-01

179

Getting back on Track  

ERIC Educational Resources Information Center

|This September saw the start of Back on Track, a pioneering pilot course for young people with mental health problems who would like to return to learning or work. The course is being run in Portsmouth by local further education (FE) colleges, with Highbury College the main provider, in collaboration with Headspace, the Portsmouth City Mental…

Ringland, Pam

2007-01-01

180

Tracking Politics with POWER  

ERIC Educational Resources Information Center

|Purpose: POWER is an ontology of political processes and entities. It is designed for tracking politicians, political organizations and elections, both in mainstream and social media. The aim of this paper is to propose a data model to describe political agents and their relations over time. Design/methodology/approach: The authors propose a data…

Moreira, Silvio; Batista, David S.; Carvalho, Paula; Couto, Francisco M.; Silva, Mario J.

2013-01-01

181

Respiration tracking in radiosurgery  

Microsoft Academic Search

Respiratory motion is difficult to compensate for with conventional radiotherapy systems. An accurate tracking method for following the motion of the tumor is of considerable clinical relevance. We investigate methods to compensate for respiratory motion using robotic radiosurgery. In this system the therapeutic beam is moved by a robotic arm, and follows the moving target through a combination of infrared

Achim Schweikard; Hiroya Shiomi

2004-01-01

182

Tracking Through the Tulips  

NSDL National Science Digital Library

"Tiptoe Through the Tulips" was the theme song for kindergarten through second-grade students at Ashland City Primary in Ashland, Tennessee who participated in Journey North, a free, online educational program that enables sudents to track the blooming of tulips across the country as spring comes to North America.

Davis, Dorothy

2005-04-01

183

Tracking Tyrannosaurus: Notes on Purported T. rex Tracks  

Microsoft Academic Search

Purported T. rex tracks (genus Tyrannosaurus) are rare and, if poorly preserved, difficult to identify or to distinguish with certainty from the tracks of hadrosaurs found in the same deposits. Six possible Tyrannosaurus tracks have been reported, five of which appear to be the right age, that is, Maastrichtian. However, at least two, including one that is pre-Maastrichtian, are interpreted

Martin Lockley; Paul R. Janke; Mike Triebold

2011-01-01

184

Geochronology Database for Central Colorado  

USGS Publications Warehouse

This database is a compilation of published and some unpublished isotopic and fission track age determinations in central Colorado. The compiled area extends from the southern Wyoming border to the northern New Mexico border and from approximately the longitude of Denver on the east to Gunnison on the west. Data for the tephrochronology of Pleistocene volcanic ash, carbon-14, Pb-alpha, common-lead, and U-Pb determinations on uranium ore minerals have been excluded.

Klein, T.L.; Evans, K.V.; DeWitt, E.H.

2010-01-01

185

Introductory Lectures on Tracking Detectors  

NASA Astrophysics Data System (ADS)

Introductory lectures are presented concerning the use of tracking methods in high energy particle and nuclear physics. General performance issues are discussed. The various technologies used to construct tracking detectors are surveyed. Some future directions are indicated.

Haber, Carl

2003-07-01

186

Signs and Tracks of Animals  

NSDL National Science Digital Library

Students will examine clues about animals such as nests, leaves, feathers, fur, tracks that allow some conclusions about the identity, physical characteristics or behavior of the animals. Students will study the characteristics of animal tracks.

Grimm, Susanne

187

Integrated Track Infrastructure Assessment Tools.  

National Technical Information Service (NTIS)

The Federal Railroad Administrations (FRA) Office of Research and Development sponsored a project to further the development of a mobile track surveying system that utilizes Real Time Kinematic (RTK) GPS technology for comparing track alignments over time...

R. Begley

2011-01-01

188

Rubber Pads for Tank Track.  

National Technical Information Service (NTIS)

Investigations of rubber compounding, service test evaluation, and rubber-to-metal bonding were made. The injection-molding of track pads was attempted. Numerous compounds were developed for optimum properties, and track pads prepared fromthese compounds ...

E. W. Bergstrom J. R. Cerny

1971-01-01

189

Some Issues Related to Simulation of the Tracking and Communications Computer Network.  

National Technical Information Service (NTIS)

The Communications Performance and Integration branch of the Tracking and Communications Division has an ongoing involvement in the simulation of its flight hardware for Space Station Freedom. Specifically, the communication process between central proces...

R. C. Lacovara

1989-01-01

190

Kalman filter for vision tracking  

Microsoft Academic Search

The Kalman filter has been used successfully in di erent prediction applications or state determination of a system. One important field in computer vision is the object tracking. Di erent movement conditions and occlusions can hinder the vision tracking of an object. In this report we present the use of the Kalman filter in the vision tracking. We consider the

Erik Cuevas; Daniel Zaldivar; Raul Rojas

191

GEOS-3 Doppler Difference Tracking.  

National Technical Information Service (NTIS)

The Doppler difference method as applied to track the GEOS 3 spacecraft is discussed. In this method a pair of 2 GHz ground tracking stations simultaneously track a spacecraft beacon to generate an observable signal in which bias and instability of the ca...

B. Rosenbaum

1977-01-01

192

IMM architecture for track fusion  

Microsoft Academic Search

A numeric solution for the fusion of multiple tracks produced form an arbitrary number of asynchronous measurements has been recently developed. This track fusion solution is a weighted sum of the values associated with the previous fused estimate and the multiple individual estimates. This optimal asynchronous track fusion algorithm (OATFA) has properties that are identical to the Kalman filter. However,

Gregory A. Watson; Theodore R. Rice; Ali T. Alouani

2000-01-01

193

Tracking facial features with occlusions  

Microsoft Academic Search

Facial expression recognition consists of determining what kind of emotional content is presented in a human face. The problem presents a complex area for exploration, since it encompasses face acquisition, facial feature tracking, facial ex- pression classification. Facial feature tracking is of the most interest. Active Appearance Model (AAM) enables accurate tracking of facial features in real-time, but lacks occlusions

MARKIN Evgeny

2006-01-01

194

Aerosol dynamics in ship tracks  

Microsoft Academic Search

Ship tracks are a natural laboratory to isolate the effect of anthropogenic aerosol emissions on cloud properties. The Monterey Area Ship Tracks (MAST) experiment in the Pacific Ocean west of Monterey, California, in June 1994, provides an unprecedented data set for evaluating our understanding of the formation and persistence of the anomalous cloud features that characterize ship tracks. The data

Lynn M. Russell; John H. Seinfeld; Richard C. Flagan; Ronald J. Ferek; Dean A. Hegg; Peter V. Hobbs; Wolfram Wobrock; Andrea I. Flossmann; Colin D. O'Dowd; Kurt E. Nielsen; Phillip A. Durkee

1999-01-01

195

Spatial deployment of attention influences both saccadic and pursuit tracking  

Microsoft Academic Search

We examined the effects of changing spatial aspects of attention during oculomotor tracking. Human subjects were instructed to make a discrimination on either the small (0.8°) central or the large (8°) peripheral part of a compound stimulus (two counter-rotating concentric rings) while the stimulus either translated across the screen or was stationary. During this period, a transient perturbation with either

Laurent Madelain; Richard J. Krauzlis; Josh Wallman

2005-01-01

196

On-board calibration monitor for tracking instrument sensitivity  

Microsoft Academic Search

The On-board Calibration Monitor (OCM) is being developed as an integral component of the ACCESS instrument and as a pathfinder for other missions. It provides stable full-aperture illumination of the telescope for tracking the instrument sensitivity as a function of time. The light source is composed of an ensemble of LED pairs with central wavelengths that span the spectral range

J. W. Kruk; M. E. Kaiser; S. R. McCandliss; J. Orndorff; R. H. Barkhouser; D. J. Sahnow; D. J. Benford; R. C. Bohlin; S. E. Deustua; W. V. Dixon; P. D. Feldman; J. P. Gardner; R. A. Kimble; R. Kurucz; M. Lampton; H. W. Moos; S. Perlmutter; B. J. Rauscher; A. G. Riess; B. E. Woodgate; E. L. Wright

2008-01-01

197

Dinosaur Tracks and Traces  

NASA Astrophysics Data System (ADS)

The study of fossilized dinosaur remains, vertebrate paleontology is a well established discipline, but the discovery and rediscovery of numerous and varied dinosaur footprints and nest sites has spurred a renaissance in the associated field of ichnological research. Dinosaur Tracks and Traces is the first book ever to be devoted to this subject, and it represents the work of seventy noted dinosaur ichnologists. Contributors address the history of science and the relevance of dinosaur ichnology to the interpretation of dinosaur behaviour, paleoecology, paleoenvironments, and evolution. Several new preservation, conservation, and documentation techniques are also presented. The book is richly illustrated and is intended for students and professionals in the areas of paleontology, vertebrate zoology, geology, and paleoenvironmental analysis. The historical aspects of the book and the many site descriptions also make Dinosaur Tracks and Traces appealing to amateur fossil collectors and dinosaur enthusiasts.

Gillette, David D.; Lockley, Martin G.

1991-02-01

198

Tracking change over time  

USGS Publications Warehouse

Landsat satellites capture images of Earth from space-and have since 1972! These images provide a long-term record of natural and human-induced changes on the global landscape. Comparing images from multiple years reveals slow and subtle changes as well as rapid and devastating ones. Landsat images are available over the Internet at no charge. Using the free software MultiSpec, students can track changes to the landscape over time-just like remote sensing scientists do! The objective of the Tracking Change Over Time lesson plan is to get students excited about studying the changing Earth. Intended for students in grades 5-8, the lesson plan is flexible and may be used as a student self-guided tutorial or as a teacher-led class lesson. Enhance students' learning of geography, map reading, earth science, and problem solving by seeing landscape changes from space.

U.S. Geological Survey

2011-01-01

199

The ALICE Inner Tracking System Upgrade  

NASA Astrophysics Data System (ADS)

A central component of the ALICE Upgrade will be a completely new Inner Tracking System (ITS). The performance of the new ITS will be a significant improvement over that of the present ITS, in particular in the areas of material budget, granularity, a reduced radial distance from the first layer to the beam and rate capability. This will enable many key measurements of the properties of the quark-gluon plasma to be performed, in particular with rare probes such as low momentum charm and beauty mesons and baryons.

Lemmon, Roy

2013-05-01

200

Tracking unique objects  

Microsoft Academic Search

Is content addressable in the representation that subserves performance in multiple-object-tracking (MOT) experiments? We\\u000a devised an MOT variant that featured unique, nameable objects (cartoon animals) as stimuli. There were two possible response\\u000a modes: standard, in which observers were asked to report the locations of all target items, and specific, in which observers\\u000a had to report the location of a particular

Todd S. Horowitz; Sarah B. Klieger; David E. Fencsik; Kevin K. Yang; George A. Alvarez; Jeremy M. Wolfe

2007-01-01

201

Fast tracking hospital construction.  

PubMed

Hospital leaders should consider four factors in determining whether to fast track a hospital construction project: Expectations of project length, quality, and cost. Whether decisions can be made quickly as issues arise. Their own time commitment to the project, as well as that of architects, engineers, construction managers, and others. The extent to which they are willing to share with the design and construction teams how and why decisions are being made. PMID:23513759

Quirk, Andrew

2013-03-01

202

Tracking Online Trails  

NASA Astrophysics Data System (ADS)

Traceability is a key to the investigation of the internet criminal and a cornerstone of internet research. It is impossible to prevent all internet misuse but may be possible to identify and trace the users, and then take appropriate action. This paper presents the value of traceability within the email/-newsposting utilities, the technologies being using to hide identities, the difficulties in locating the traceable data and the challenges in tracking online trails.

Qi, Man; Edgar-Nevill, Denis; Wang, Yongquan; Xu, Rongsheng

203

Respiration tracking in radiosurgery  

SciTech Connect

Respiratory motion is difficult to compensate for with conventional radiotherapy systems. An accurate tracking method for following the motion of the tumor is of considerable clinical relevance. We investigate methods to compensate for respiratory motion using robotic radiosurgery. In this system the therapeutic beam is moved by a robotic arm, and follows the moving target through a combination of infrared tracking and synchronized x-ray imaging. Infrared emitters are used to record the motion of the patient's skin surface. The position of internal gold fiducials is computed repeatedly during treatment, via x-ray image processing. We correlate the motion between external and internal markers. From this correlation model we infer the placement of the internal target during time intervals where no x-ray images are taken. Fifteen patients with lung tumors have recently been treated with a fully integrated system implementing this new method. The clinical trials confirm our hypothesis that internal motion and external motion are indeed correlated. In a preliminar study we have extended our work to tracking without implanted fiducials, based on algorithms for computing deformation motions and digitally reconstructed radiographs.

Schweikard, Achim; Shiomi, Hiroya; Adler, John [Informatik, Universitaet Luebeck, 23538 Luebeck (Germany); Division of Multidisciplinary Radiotherapy, Osaka University Graduate School of Medicine (Japan); Neurosurgery, Stanford University Medical Center, Stanford, California 94305 (United States)

2004-10-01

204

Feature-aided tracking (FAT)  

NASA Astrophysics Data System (ADS)

Association of observations and tracks is a fundamental component of most solutions to the tracking problem. Association is frequently formulated as a multiple hypothesis test. Typically, the test statistic, called the track score, is the likelihood or likelihood ratio of the observations conditioned upon the association hypotheses. Assuming that the test is reasonably efficient, further reduction in the association error probability necessitates the introduction of additional information into the track score. This additional information is embodied in quantities called track features which are to be included in the track score. In practice, the necessary conditional probabilities of the track features are unknown. The class of non-parametric hypothesis tests is designed to provide such a test in the absence of any probabilistic information about the data. However, the test statistics used in non-parametric tests cannot be used directly in the track score. The one probabilistic quantity generally available with non-parametric tests is the Type I error probability, the probability of failing to accept a true hypothesis. If the non-parametric test is distribution free then the Type I error probability is independent of the distribution of the track features. This paper presents a distribution free, non-parametric test of the track features that can be used to test the association hypotheses and a quantity that can be included in the track score is derived from the Type I error probability of the test.

Singer, Paul F.; Coursey, Amanda L.

2004-08-01

205

Electromagnetic tracking for catheter localization  

NASA Astrophysics Data System (ADS)

A low frequency AC electromagnetic tracking system is presented that is capable of determining the position and orientation of a catheter tip. Advantages of using magnetic tracking for this application is that magnetic fields are non-ionizing and pass through the human body with minimal attenuation. Low frequency fields are used to mitigate the effects of eddy currents induced in conductive materials found in the environment. There are two significant differences between this and other magnetic tracking technologies, these being (1) the use of a single magnetic sensing coil for position and orientation determination and (2) the eliminating of range restrictions between the sensing antenna and the magnetic field generators. This paper will discuss the general theory of electromagnetic tracking, why it is that researchers have an intense interest for internal tracking and a comparison of the new and old tracking technologies. Some applications of this tracking technology will also be presented.

Schneider, Mark R.

1999-07-01

206

Tracking subduction fluids  

NASA Astrophysics Data System (ADS)

Hitomi Nakamura, sometimes on her own, braved remote ravines and thick jungles in order to sample volcanic rocks that help reveal the complex geometry of two overlapping plates subducting into the mantle beneath central Japan.

2008-06-01

207

Performance Measurement of the Upgraded D0 Central Track Trigger.  

National Technical Information Service (NTIS)

The DO experiment was upgraded in spring 2006 to harvest the full physics potential of the Tevatron accelerator at Fermi National Accelerator Laboratory, Batavia, Illinois, USA. It is expected that the peak luminosity delivered by the accelerator will inc...

R. K. Mommsen

2007-01-01

208

A strong tracking nonlinear robust filter for eye tracking  

Microsoft Academic Search

Non-intrusive methods for eye tracking are important for many applications of vision-based human computer interaction. However,\\u000a due to the high nonlinearity of eye motion, how to ensure the robustness of external interference and accuracy of eye tracking\\u000a pose the primary obstacle to the integration of eye movements into today’s interfaces. In this paper, we present a strong\\u000a tracking unscented Kalman

Zutao Zhang; Jiashu Zhang

2010-01-01

209

Making Tracks: Dinosaur Footprints  

NSDL National Science Digital Library

In this lesson, students will learn about the occurrence of dinosaur tracks and their usefulness in studying these extinct creatures. Background materials discuss early discoveries of dinosaur footprints and point out that there are many more fossil footprints than there are fossil skeletons or bones, making them more likely to be discovered. There is also discussion of the information that scientists can gather from these fossils: anatomical details; behavior, social structure and physical environment; the way the animal moved; and their approximate speed. The lesson includes an activity in which students calculate the length of an animal's leg from measurements taken from their footprints. A downloadable, printable version is provided.

210

Tracking disease outbreaks  

NASA Astrophysics Data System (ADS)

Scientists have come one step closer to tracking outbreaks of bartonellosis, a potentially fatal vector-borne disease. Outbreaks of the disease, which was once thought to be found primarily in the high Andes Mountains of Peru, Ecuador, and Colombia, may be related to El Ni˜no events, according to researchers with NASA and the U.S. military.In findings reported on 17 January, climatology and disease prevention researchers said a study conducted in two regions in Peru points to a strong potential link between the 1997-1998 El Niño and an increase in sand flies, which are thought to be the disease host carriers.

Showstack, Randy

211

Optical correlator tracking nonlinearity  

NASA Astrophysics Data System (ADS)

A limitation observed in the tracking ability of optical correlators is reported. It is shown by calculations that an inherent nonlinearity exists in many optical correlator configurations, with the problem manifesting itself in a mismatch of the input scene with the position of the correlation signal. Results indicate that some care must be given to the selection of components and their configuration in constructing an optical correlator which exhibits true translational invariance. An input test scene is shown along with the correlation spot and cross hairs from a contrast detector; the offset is apparent.

Gregory, Don A.; Kirsch, James C.; Johnson, John L.

1987-01-01

212

SCOUT: 3D tracking  

NASA Astrophysics Data System (ADS)

The seam-following system SCOUT precisely positions a robot or gantry ready for laser welding -- at an accuracy of +/- 0.05 mm on three Cartesian axes (X, Y, Z) -- and controls the three cardanic angles of orientation (A, B, C) in space. SCOUT automates high-speed bonding and sealing processes. Image processing at 50 Hz provides for feedrates of more than 20 meters per minute. Due to the `online' programming feature the conventional time- consuming preprogramming to define the robot's track prior to processing and for each modification of the workpiece has now become superfluous.

Barthel, Klaus G.

1994-11-01

213

Combined 40Ar/39Ar and Fission-Track study of the Freetown Layered Igneous Complex, Freetown, Sierra Leone, West Africa: Implications for the Initial Break-up of Pangea to form the Central Atlantic Ocean and Insight into the Post-rift Evolution of the Sie  

NASA Astrophysics Data System (ADS)

Sierra Leone lies within the south-western part of the West African Craton and comprises two major Archaean structural divisions: a low-grade granite-greenstone terrane characterised by N-S striking structures and a NW-SE striking highly metamorphosed belt of strained rocks that form the coastal margin of the craton. Intruded into the belt is the Freetown Layered Igneous Complex (FLIC), a tholeiitic magamtic body emplaced prior to or during the break-up of Pangea to form the Central Atlantic Ocean and, forming today the high ground of the coastal outline of Sierra Leone which is one of the most distinctive features on the West African coast. The break-up of Pangaea to form the Central Atlantic and its passive margins began in the Early Jurassic. Geo-tectonically, the break-up was particularly characterised by the formation of the Central Atlantic Magmatic Province (CAMP), covering once-contiguous parts of North America, Europe, Africa and South America. The FLIC forming part of the heart of CAMP is the largest single layered igneous intrusive yet known on either side of the Central Atlantic, measuring on surface, 65 x 14 x 7 km. Geophysical investigations indicate that the intrusion extends offshore to a depth of about 20 km. Geologically the Complex is a rhythmically layered elongated ultramafic-mafic lopolith divisible into 4 major zones each comprising repeated sequences of troctolitic, gabbroic and anorthositic rocks. An idealised unit of layering is from base upwards: dunite, troctolite, olivine-gabbro, leuco-gabbro, gabbro-norite and anorthosite cumulates. 40Ar-39Ar age spectra and 40Ar/36Ar versus 39Ar/36Ar isochron plots obtained by stepwise-heating experiments on plagioclases, biotites and amphiboles from troctolites, olivine-gabbros, gabbro-norites and anorthosites of the four zones yield plateau and isochron ages that seem to depict the cooling history of the Complex after emplacement. The biotites and some of the plagioclases and amphiboles give very good plateaus that range from 196.3 ± 3 Ma to 232.1 ± 9 Ma with the best-fit isochron plots showing a range from 193.3± 10 Ma to 234.1 ± 11 Ma. Because these dates represent cooling ages, we interpret them as representing a minimum intrusion-age of the Complex implying that its true emplacement age might be somewhat older than 230 Ma. Given that most established CAMP ages revolve around 200 Ma or younger, we hypothesise that FLIC represents a hitherto unknown pre-CAMP magmatic event that might have thermally triggered the initial break-up of Pangaea to form the Central Atlantic. This view is consistent with field-observations that the Complex is cross-cut by predominantly coast-parallel mafic dykes attributed to the CAMP dyke-swarm. To ascertain the hypothesis, we are currently carrying out U-Pb zircon dating to establish, precisely, the true emplacement age of the Complex. The Fission-track ages vary from 91.7 ± 7 Ma to 114.6 ± 9 Ma. This age range shows that after emplacement and crystallisation, the FLIC underwent an extremely slow cooling for a long period of time. This in turn implies that after the break-up of Pangea to form, in part, the Sierra Leone margin, a late and slow uplift (Erosion/denudation) that took place during the Cretaceous was a very important geological process that characterised the post-rift evolution of the margin. References: Barrie, I.J., P.A.M. Andriessen, F.F. Beunk, J.R. Wijbrans, V.E.H. Strasser-King, D.V.A.Fode. (2006). Tectonothermal Evolution of the Sierra Leone Passive Continental Margin, West Africa: Constraints from Thermochronology. Geochemica et Cosmochemica Acta 70 (18): A36- A36 Suppl. S Aug-Sep 2006. Marzoli, A., P.R. Renne, E.M. Piccirillo, M. Ernesto, G. Bellieni, A De Min. (1999). Extensive 200-Million-Year-Old Continental Flood Basalts of the Central Atlantic Magmatic Province. Science284: 616-618. McHone, J.G. (2000). Non-plume magmatism and rifting during the opening of the central Atlantic Ocean. Tectonophysics, 316: 287-296. Umeji, A.C. (1983). Geochemistry and Mineralogy of the Freetown Layered Basic Igne

Barrie, Ibrahim; Wijbrans, Jan; Andriessen, Paul; Beunk, Frank; Strasser-King, Victor; Fode, Daniel

2010-05-01

214

Physically Based Tracking of Cloth  

Microsoft Academic Search

In this work a method for tracking fabrics in videos is proposed which, unlike most other cloth tracking algorithms, employs an analysis-by-synthesis ap- proach. That is tracking consists of optimising a set of parameters of a mass-spring model that is used to simulate the textile, dening on the one hand the fabric properties and on the other the positions of

Nils Hasler; Mark Asbach; Bodo Rosenhahn; Jens-Rainer Ohm; Hans-Peter Seidel

215

REC Tracking Systems Design Guide  

SciTech Connect

OAK-B135 The Design Guide is presented in three parts. Section II describes the need for REC tracking, the two principal tracking methods available, and, in simple terms, the operation of certificate-based systems. Section III presents the major issues in the design of certificate-based tracking systems and discusses the advantages and disadvantages of alternative solutions. Finally, Section IV offers design principles or recommendations for most of these issues.

Meredith Wingate

2004-02-03

216

ATE Central  

NSDL National Science Digital Library

ATE Central is a freely available online portal and collection of materials and services that highlight the work of the Advanced Technological Education (ATE) projects and centers. These National Science Foundation funded initiatives work with educators from two-year colleges to develop and implement ideas for improving the skills of technicians and the educators who teach them. ATE Central is designed to help educators, students, and the general public to learn about, and use materials from, the entire depth and breadth of the Advanced Technological Education program.ATE Central helps direct users to a full range of high-impact ATE resources available online, including curricula, learning objects, and podcasts. The portal aggregates information about the materials developed by ATE centers and projects, and organizes them using subject taxonomies, context appropriate keywords, and other digital cataloging techniques.

2011-08-17

217

Automated call tracking systems  

SciTech Connect

User Services groups are on the front line with user support. We are the first to hear about problems. The speed, accuracy, and intelligence with which we respond determines the user`s perception of our effectiveness and our commitment to quality and service. To keep pace with the complex changes at our sites, we must have tools to help build a knowledge base of solutions, a history base of our users, and a record of every problem encountered. Recently, I completed a survey of twenty sites similar to the National Energy Research Supercomputer Center (NERSC). This informal survey reveals that 27% of the sites use a paper system to log calls, 60% employ homegrown automated call tracking systems, and 13% use a vendor-supplied system. Fifty-four percent of those using homegrown systems are exploring the merits of switching to a vendor-supplied system. The purpose of this paper is to provide guidelines for evaluating a call tracking system. In addition, insights are provided to assist User Services groups in selecting a system that fits their needs.

Hardesty, C.

1993-03-01

218

Vergence control of central and peripheral disparities.  

PubMed

The results of previous studies using either small or large target configurations suggest that open-loop (OL) vergence response dynamics may depend on the peripheral extent of the target. To investigate systemically the effect of peripheral target extent on dynamic vergence control, OL vergence responses to central, peripheral, and central-plus-peripheral targets were recorded. Open-loop disparity stimuli included steps, ramps, and sinusoids. It was found that the OL step and ramp responses to the central target were more rapid and exhibited significantly more step and multiple-step movements than those for either the peripheral or the central-plus-peripheral targets. During OL ramp stimulation, the maximum disparity for which tracking could be maintained was largest for the peripheral target. Sinusoidal responses showed the greatest gain for the central target. For all three types of stimuli, responses to the central-plus-peripheral target showed characteristics that were somewhat between those for the central and the peripheral targets. These results resolve some previously conflicting findings about open-loop vergence dynamics and suggest that large peripheral disparity stimulation initiates slow fusion of a visual scene, whereas small central disparity stimulation produces more rapid movements for precise binocular tracking of targets moving in depth. PMID:1868903

Hung, G K; Semmlow, J L; Sun, L; Ciuffreda, K J

1991-08-01

219

Numerical methods for tracking interfaces  

SciTech Connect

An overview is given of special numerical methods for tracking discontinuous fronts and interfaces. These methods include: surface tracking methods based on connected marker points along the interface, volume-tracking methods that track the volume occupied by the solution regions bounded by the interfaces, and moving mesh methods where the underlying mesh is aligned and moved with the interface. The pros and cons of the current methods are discussed, and a new method is proposed that overcomes some of the difficulties encountered in approximating equations with multiply interacting interfaces.

Hyman, J.M.

1983-01-01

220

Vehicle tracking for urban surveillance  

NASA Astrophysics Data System (ADS)

Tracking is widely used in a variety of computer vision applications, ranging from video surveillance to medical imaging. The principal goal of tracking is to first identify regions of interest in a scene, and to then monitor the movements or changes of the object through the image sequence. In this paper, we focus on unsupervised vehicle tracking for low resolution aerial images taken from an urban area. Various optical effects have traditionally made this tracking problem very challenging. Objects are often lost in tracking due to intensity changes that result from shadowed or partially occluded regions of an image. Additionally, the presence of multiple vehicles in a scene can lead to mistakes in tracking and significantly increased computation time. We propose a feature-based tracking algorithm herein that will seek to mitigate these limitations. To first isolate vehicles in the initial frame, we apply three-frame change detection to the registered images. Feature points are identified in the labelled regions using the Harris corner criteria. To track a feature point from one frame to the next, we search for the point around a predicted location, determined from the feature's previous motion, that minimizes the sum-of-squared-differences value. Finally, during the course of the image sequence, our algorithm constantly searches for new objects that might have entered the scene. We will demonstrate the success of our tracking approach through experimental considerations.

Roberts, William; Watkins, Leslie; Wu, Dapeng; Li, Jian

2008-05-01

221

Tracking with the Giotto Camera  

NASA Astrophysics Data System (ADS)

The principle of operation of the Giotto Camera is presented. The onboard computer of the camera system is introduced and the principle of the tracking procedure is explained. The test environment for the S/W-development of the onboard computer is outlined. The data generated by the tracking system during the Halley flyby are analyzed. It became evident that the tracking system operated flawlessly. The observed anomalies could be traced to the pointing mechanisms. The operational capability of the camera tracking system is not questionable and hence does not object the planned reactivation.

Krahn, Edgar; Michalik, H.; Rueffer, P.; Gliem, F.; Volk, K.

1990-06-01

222

Halloween Central  

NSDL National Science Digital Library

Halloween is coming up, and this site will help readers prepare for an evening of ghouls, goblins, and other nasties. Halloween Central is a fairly extensive metasite with links to a wide variety of Halloween resources, including costumes, clip art, recipes, haunted houses, Halloween safety, and pumpkins, among many others.

223

A Fully Decentralized MultiSensor System For Tracking and Surveillance  

Microsoft Academic Search

In many tracking and surveillance systems, multisensor config urations are used to provide a greater breadth of measurement information and also to increase the capability of the system to survive individual sensor failure. Most architectures currently used in such systems rely on having either a central processor where global data fusion takes place or a central communi cations medium through

B. S. Y. Rao; H. F. Durrant-Whyte; J. A. Sheen

1993-01-01

224

Teacher's Guide for Tracks. Elementary Science Study.  

ERIC Educational Resources Information Center

|This teacher's guide suggests activities that provide opportunities for students in grades 4-6 to study animal tracks. Methods are explained for using sets of 52 Track Cards which show life-size drawings of tracks made by 14 animals; sets of 10 large Mystery Track Cards with life-size drawings of the prints of large mammals; and a Track Picture…

Alexander, David; And Others

225

Vehicle tracking systems  

SciTech Connect

Several systems have been developed to accomplish vehicle location. The systems consist of three types: Dead Reckoning, Satellite, and LORAN C. If the information is to be sent back to a central location, some type of radiocommunication system is needed. One can use the existing voice radio or add a radio system just for transmitting the data.

Schwalm, R.W.

1987-01-01

226

Solid State Nuclear Track Detectors--I: Track Characteristics and Formation Mechanisms.  

ERIC Educational Resources Information Center

|Heavily ionizing charged particles produce radiation damage tracks in a wide variety of insulating materials. The experimental properties of these tracks and track recorders are described. The mechanisms by which the tracks are produced are discussed. (Author/KR)|

Lal, Nand

1991-01-01

227

Tracking the Coriolis Force  

NSDL National Science Digital Library

Tracking the Coriolis Force uses the Tracker video analysis tool to model the motion of a ball rolling with constant velocity on a rotating merry-go-round. Video includes the motion of the ball as viewed from the rotating reference frame of the merry-go-round. Using the Coriolis force equation, students build a model of the motion. The zip file contains the activity handout, video and Tracker file. The video comes from YouTube and can be found at http://www.youtube.com/watch?v=LAX3ALdienQ. A talk about this activity from the AAPT Winter Meeting 2013 can be found at http://tinyurl.com/trackerCoriolis. To open the Tracker file, download and run Tracker from http://www.cabrillo.edu/~dbrown/tracker/. Tracker is free.

Cox, Anne

2012-06-16

228

Microencapsulated cell tracking  

PubMed Central

Microencapsulation of therapeutic cells has been widely pursued to achieve cellular immunoprotection following transplantation. Initial clinical studies have shown the potential of microencapsulation using semi-permeable alginate layers, but much needs to be learned about the optimal delivery route, in vivo pattern of engraftment, and microcapsule stability over time. In parallel with noninvasive imaging techniques for ‘naked’ (i.e. unencapsulated) cell tracking, microcapsules have now been endowed with contrast agents that can be visualized by 1H MRI, 19F MRI, X-ray/computed tomography and ultrasound imaging. By placing the contrast agent formulation in the extracellular space of the hydrogel, large amounts of contrast agents can be incorporated with negligible toxicity. This has led to a new generation of imaging biomaterials that can render cells visible with multiple imaging modalities.

Arifin, Dian R.; Kedziorek, Dorota A.; Fu, Yingli; Chan, Kannie W. Y.; McMahon, Michael T.; Weiss, Clifford R.; Kraitchman, Dara L.; Bulte, Jeff W. M.

2013-01-01

229

Buyer's Guide for Track Construction.  

ERIC Educational Resources Information Center

|This buyers guide provides information on needs assessment, buying options, and decision making tips when acquiring a new school athletic track. Among the topics covered are developing a budget, choosing a site selection, choosing a track surface, developing working specifications, and selecting a contractor. Also explored is the question of…

United States Tennis Court & Track Builders Association.

230

Track Quality Indicator with Hysteresis.  

National Technical Information Service (NTIS)

A first object of the present invention is providing a method for indicating the quality of tracks in a passive sonar system. Another object of the invention is providing such a method that is not overly sensitive to track status changes. Accordingly, the...

W. R. Lane

2002-01-01

231

Littoral tracking using particle filter  

Microsoft Academic Search

Littoral tracking refers to the tracking of targets on land and in sea near the boundary of the two regions. A ground-moving target continues to move on land and can not enter the sea. Similarly, a sea-moving target moves in the sea and the land serves as an infeasible region. Enforcing infeasible regions or hard constraints in the framework of

Mahendra Mallick; S. Maskell; T. Kirubarajan; N. Gordon

2002-01-01

232

Lateral motion tracking of automobiles  

Microsoft Academic Search

Radar sensors, though successful in range parameters tracking, fall short in lateral characteristics tracking. On the other hand, vision systems carry out perfect estimation for lateral motion, but range parameters estimation does not surpass the performance of radar. The exact estimation of vehicle's motion characteristics appears to be a crucial issue in modern automobile collision avoidance systems. Thus, a fusion

Angelos Amditis; Nikolaos Floudas; Aris Polychronopoulos

233

Eye Tracking in Infancy Research  

Microsoft Academic Search

The current review offers a unique introduction to the use of corneal reflection eye tracking in infancy research. We provide a detailed description of how to calibrate, collect, and analyze infants' gaze in a series of experimental paradigms, focusing specifically on the analysis of visual tracking, point of gaze, and the latency of gaze shifts (prediction and reactive gaze shifts).

Gustaf Gredebäck; Scott Johnson; Claes von Hofsten

2009-01-01

234

CONTRACT ADMINISTRATIVE TRACKING SYSTEM (CATS)  

EPA Science Inventory

The Contract Administrative Tracking System (CATS) was developed in response to an ORD NHEERL, Mid-Continent Ecology Division (MED)-recognized need for an automated tracking and retrieval system for Cost Reimbursable Level of Effort (CR/LOE) Contracts. CATS is an Oracle-based app...

235

Tracking Emerging Markets and Trends.  

ERIC Educational Resources Information Center

|Describes the kinds of online sources to use and processes involved in finding information on emerging markets and new industry trends. Highlights include relevance ranking in DIALOG searches; press releases; news sources; news alert services; market research reports; tracking research in progress; company information; and tracking subsidiaries.…

Bates, Mary Ellen

1994-01-01

236

Buyer's Guide for Track Construction.  

ERIC Educational Resources Information Center

This buyers guide provides information on needs assessment, buying options, and decision making tips when acquiring a new school athletic track. Among the topics covered are developing a budget, choosing a site selection, choosing a track surface, developing working specifications, and selecting a contractor. Also explored is the question of…

United States Tennis Court & Track Builders Association.

237

Passage Feedback for News Tracking.  

National Technical Information Service (NTIS)

We extend the event tracking task of Topic Detection and Tracking (TDT) to create a framework in which a user can highlight relevant passages in addition to specifying the relevance of documents. A dual framework of combined document and passage feedback ...

H. Raghavan J. Allan

2006-01-01

238

Robust Face Tracking Using Color  

Microsoft Academic Search

In this paper we discuss a new robust tracking technique applied to histograms of intensity normalized color. This technique supports a video codec based on orthonormal basis coding. Orthonormal basis coding can be very effi- cient when the images to be coded have been normalized in size and position. However, an imprecise tracking proce- dure can have a negative impact

Karl Schwerdt; James L. Crowley

2000-01-01

239

Segmentation of Tracking Sequences Using Dynamically Updated Adaptive Learning  

PubMed Central

The problem of segmentation of tracking sequences is of central importance in a multitude of applications. In the current paper, a different approach to the problem is discussed. Specifically, the proposed segmentation algorithm is implemented in conjunction with estimation of the dynamic parameters of moving objects represented by the tracking sequence. While the information on objects’ motion allows one to transfer some valuable segmentation priors along the tracking sequence, the segmentation allows substantially reducing the complexity of motion estimation, thereby facilitating the computation. Thus, in the proposed methodology, the processes of segmentation and motion estimation work simultaneously, in a sort of “collaborative” manner. The Bayesian estimation framework is used here to perform the segmentation, while Kalman filtering is used to estimate the motion and to convey useful segmentation information along the image sequence. The proposed method is demonstrated on a number of both computed-simulated and real-life examples, and the obtained results indicate its advantages over some alternative approaches.

Michailovich, Oleg; Tannenbaum, Allen

2009-01-01

240

Garlic Central  

NSDL National Science Digital Library

Can garlic help repel mosquitoes? Find out the answer to this question and more at Garlic Central, an all-about-garlic website created by aficionado Trevor Mendham. The site contains an introductory section--titled Garlic 101--and sections that address culinary uses, medicinal benefits, and cultivation. The site's Cooking section includes a collection of recipes; and information about storing, freezing, and crushing garlic. The site also features a brief how-to guide for planting, growing, and harvesting garlic. Garlic Central even hosts a virtual shopping mall that connects site visitors to a wide range of garlic-related websites peddling foodstuffs, kitchen implements, posters, books, and garden supplies. This site is also reviewed in the September 17, 2004 _NSDL Life Sciences Report_.

241

Central Africa  

NSDL National Science Digital Library

Begun in 1996, the International Crisis Group's (ICG) Central Africa Project analyzes political and ethnic conflict within and between the nations that straddle mid-Africa, including the Democratic Republic of Congo (DRC), Burundi, Angola, Uganda, and Rwanda. As part of that effort ICG has released over twelve full text reports in the last year (a few in French only). The two most recent in-depth reports are: "Africa's Seven-Nation War," which examines how the armies of seven African nations have been drawn into the rebellion against DRC President Laurent Dsir Kabila; and "How Kabila Lost His Way," which traces the foundation of the Kabila regime and seeks to discover why it has engendered both internal and external opposition. Well-researched and fully footnoted, yet written with a non-specialist audience in mind, these reports are a good resource for both students and general readers with an interest in the current situation in Central Africa.

1996-01-01

242

Track Systems and Other Related Railroad Topics.  

National Technical Information Service (NTIS)

The 11 papers in this report deal with the following areas: effect of design parameters on track support systems; improvement in rail support; track structure systems; problems and needs in tie and fastener research; track-structure analysis: methodology ...

1977-01-01

243

Tracking with text-based messages  

Microsoft Academic Search

As an initial research prototype, TextTrack demonstrates the feasibility of applying multiple hypothesis tracking concepts from radar signal processing to natural-language text tracking and correlation problems

C. Alberola; G. V. Cybenko

1999-01-01

244

ARTS-III Augmented Tracking Study.  

National Technical Information Service (NTIS)

The report is compiled from the results obtained during investigation of methods for improving aircraft tracking techniques within the ARTS-III system. This study recognizes the current tracking level of the Basic Radar Beacon Tracking Level (RBTL) system...

B. Birkholz B. Smulowicz G. Kelly M. Wold R. Sittler

1972-01-01

245

PE Central  

NSDL National Science Digital Library

The Virginia Polytechnic Institute Health and Physical Education Program developed this site, a clearinghouse of information about K-12 physical education and health. An extensive list of lesson plans and assessment ideas, arranged topically and by grade level, is the focal point of this site; the Classroom Teacher Lesson Ideas uses PE "across the curriculum" to help students learn concepts in other subjects. PE Central provides information for PE professionals on relevant journals, job announcements, and equipment purchases, among other topics.

1996-01-01

246

Raptor Center: Migration Tracking  

NSDL National Science Digital Library

Part of the larger University of Minnesota Raptor Center site, this site features regularly updated location information on individual Hawks first captured on their breeding grounds in western Minnesota; they migrate to wintering grounds in central South America. Almost daily information is relayed from the birds to an Argos satellite, then to a receiving station in Maryland and finally to the Raptor Center. Users can follow 1996 individuals from St. Paul, MN to Caimanes, Bolivia.

1997-01-01

247

Buffon needle method of track counting  

SciTech Connect

A new technique of quantitative track counting, the Buffon needle method, is advanced. It is based on random sampling of the solid state track recorder (SSTR) surface. This new method extends quantitative track scanning to track densities well up into the track pile-up regime. It is shown that the Buffon needle method possesses a reduced dependence upon both track density nonuniformity and track size distribution. Sources of experimental error arising in the Buffon needle method are assessed. The validity of the Buffon needle method is demonstrated down to at least the 10% uncertainty level (1sigma) by manual sampling of high fission track density mica SSTR observed with scanning electron microscopy.

Gold, R.; Roberts, J.H.; Ruddy, F.H.

1981-09-04

248

High resolution track etch autoradiography  

DOEpatents

A detector assembly is disclosed for use in obtaining alpha-track autoradiographs, the detector assembly including a substantially boron-free substrate; a detector layer deposited on the substantially boron-free substrate, the detector layer being capable of recording alpha particle tracks and exhibiting evidence of the alpha tracks in response to being exposed to an etchant, the detector layer being less than about 2 microns thick; and a protective layer deposited on the detector layer, the protective layer being resistant to the etchant and having a thickness of about 0.5 to 1 microns. 13 figures.

Solares, G.; Zamenhof, R.G.

1994-12-27

249

The Automatic Library Tracking Database  

SciTech Connect

A library tracking database has been developed and put into production at the National Institute for Computational Sciences and the Oak Ridge Leadership Computing Facility (both located at Oak Ridge National Laboratory.) The purpose of the library tracking database is to track which libraries are used at link time on Cray XT5 Supercomputers. The database stores the libraries used at link time and also records the executables run in a batch job. With this data, many operationally important questions can be answered such as which libraries are most frequently used and which users are using deprecated libraries or applications. The infrastructure design and reporting mechanisms are presented along with collected production data.

Fahey, Mark R [ORNL; Jones, Nicholas A [ORNL; Hadri, Bilel [ORNL

2010-01-01

250

Sun Tracking Systems: A Review  

PubMed Central

The output power produced by high-concentration solar thermal and photovoltaic systems is directly related to the amount of solar energy acquired by the system, and it is therefore necessary to track the sun's position with a high degree of accuracy. Many systems have been proposed to facilitate this task over the past 20 years. Accordingly, this paper commences by providing a high level overview of the sun tracking system field and then describes some of the more significant proposals for closed-loop and open-loop types of sun tracking systems.

Lee, Chia-Yen; Chou, Po-Cheng; Chiang, Che-Ming; Lin, Chiu-Feng

2009-01-01

251

Abrasion resistant track shoe grouser  

DOEpatents

A track shoe for a track-type vehicle. The track shoe includes a base plate and a grouser projecting away from the base plate. A capping surface structure of substantially horseshoe shaped cross-section is disposed across a distal portion of the grouser. The capping surface structure covers portions of a distal edge surface and adjacent lateral surfaces. The capping surface structure is formed from an material characterized by enhanced wear resistance relative to portions of the grouser underlying the capping surface structure.

Fischer, Keith D; Diekevers, Mark S; Afdahl, Curt D; Steiner, Kevin L; Barnes, Christopher A

2013-04-23

252

Admissible tracks in Shamir's scheme  

Microsoft Academic Search

We consider Shamir's secret sharing schemes, with the secret placed as a coefficient ai of the scheme polynomial f(x)=a0+?+ak?1xk?1, determined by a sequence t=(t0,…,tn?1)?Fqn pairwise different public identities, called a track. If t defines a k-out-of-n Shamir's scheme then the track t is called (k,i)-admissible. If t is not a (k,i)-admissible track, we obtain the scheme with some privileged coalitions

Andrzej Schinzel; Stanislaw Spiez; Jerzy Urbanowicz

2010-01-01

253

The Qweak tracking system  

SciTech Connect

The Q{sub weak}{sup p} experiment will measure the parity-violating elastic e-p scattering asymmetry to extract the weak charge of the proton. The experiment employs a toroidal magnet to focus electrons scattered at 8{sup o} {+-} 2{sup o}, corresponding to Q{sup 2} {approx} 0.03 (GeV/c){sup 2}, on eight Cerenkov detectors located in the focal plane of the spectrometer. Since the asymmetry is proportional to Q{sup 2}, it is crucial to obtain an accurate measure of the acceptance-averaged value of Q{sup 2}. A tracking system will be used in a low-rate counting mode, allowing individual events to be observed. This will enable a determination of the average Q{sup 2} by measuring the scattering angle and interaction vertex, for mapping the response across the surface of the Cerenkov detectors, and for the dilution of the Cerenkov detector signal by background.

K.H. Grimm; Qweak Collaboration

2005-02-01

254

Tracking Earthquake Cascades  

NASA Astrophysics Data System (ADS)

In assessing their risk to society, earthquakes are best characterized as cascades that can propagate from the natural environment into the socio-economic (built) environment. Strong earthquakes rarely occur as isolated events; they usually cluster in foreshock-mainshock-aftershock sequences, seismic swarms, and extended sequences of large earthquakes that propagate along major fault systems. These cascades are regulated by stress-mediated interactions among faults driven by tectonic loading. Within these cascades, each large event can itself cause a chain reaction in which the primary effects of faulting and ground shaking induce secondary effects, including tsunami, landslides, liquefaction, and set off destructive processes within the built environment, such as fires and radiation leakage from nuclear plants. Recent earthquakes have demonstrated how the socio-economic effects of large earthquakes can reverberate for many years. To reduce earthquake risk and improve the resiliency of communities to earthquake damage, society depends on five geotechnologies for tracking earthquake cascades: long-term probabilistic seismic hazard analysis (PSHA), short-term (operational) earthquake forecasting, earthquake early warning, tsunami warning, and the rapid production of post-event information for response and recovery (see figure). In this presentation, I describe how recent advances in earthquake system science are leading to improvements in this geotechnology pipeline. In particular, I will highlight the role of earthquake simulations in predicting strong ground motions and their secondary effects before and during earthquake cascades

Jordan, T. H.

2011-12-01

255

Charged particle tracking in high multiplicity events at RHIC  

SciTech Connect

It is generally accepted that the ability to track some fraction of the charged particles produced in heavy ion collisions is very desirable. At a very minimum, one must detect the occurance of multiple interactions in a single crossing. The very tight beam structure at RHIC does not favor time separation, so the location of separate vertices seems the best solution. The limits of tracking large numbers of tracks in a solid angle approaching 4..pi.. have been explored. A model detector considered is a 2.5 m radius TPC, a true 3D tracking device. In order to estimate the particle density of a function of production angle, five Hijet Au-Au central events were used to deduce the particle density distribution as a function of polar angle. An important feature of a tracking detector is the effective ''pixel'' size - the area within which two tracks cannot be resolved. In a TPC with multistep avalanche chamber readout this is approximately 3 mm x 3 mm or approx.0.1 cm/sup 2/. Using this pixel size we have calculated the radius at which the number of particles/pixel is 0.01 and 0.1. With the exception of the region very near the beam expect these distributions aren't expected to change very much with the application of a low (approx. 0.5 tesla) magnetic field. While the actual reconstruction efficiency will depend on the fine details of the apparatus and reconstruction program, the 1% fill fraction is safe for efficiencies in the 80 to 90% region. Tracking is found to be feasible at pseudorapidities up to 3.

Foley, K.J.; Love, W.A.

1985-01-01

256

2. West portal of Tunnel 27, contextual view from track ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. West portal of Tunnel 27, contextual view from track level east of Tunnel 26 (HAER CA-202), 210mm lens. Note solar panel providing signal power, evidence of continuing updating of technology by the railroad. Single-light searchlight-type signal was typical system-wide on the Southern Pacific prior to the 1980s merger with the Denver & Rio Grande Western. - Central Pacific Transcontinental Railroad, Tunnel No. 27, Milepost 133.9, Applegate, Placer County, CA

257

Predictive tracking over occlusions by 4-month-old infants  

Microsoft Academic Search

Two experiments investigated how 16-20-week-old infants visually tracked an object that oscillated on a horizontal trajectory with a centrally placed occluder. To determine the principles underlying infants' tendency to shift gaze to the exiting side before the object arrives, occluder width, oscillation frequency, and motion amplitude were manipulated resulting in occlusion durations between 0.20 and 1.66 s. Through these manipulations,

Claes von Hofsten; Olga Kochukhova; Kerstin Rosander

2007-01-01

258

Central hyperthyroidism.  

PubMed

Central hyperthyroidism is a rare condition in which thyrotoxicosis results from primary overproduction of TSH by the pituitary gland with subsequent thyroid enlargement and hyperfunction. The two known causes of central hyperthyroidism are TSH-producing pituitary tumors (TSHomas) and the syndrome of PRTH. Both of these entities are characterized by clinical thyrotoxicosis, diffuse goiters, elevated circulating levels of free T4 and T3, and a nonsuppressed serum TSH. It is critical to distinguish central hyperthyroidism from the much more common types of primary hyperthyroidism, all of which have undetectable TSH values. TSHomas and PRTH can usually be differentiated from one another by measuring the serum alpha-subunit and the TSH response to intravenous TRH or exogenous thyroid hormone, and by pituitary imaging studies. TSHomas are usually benign adenomas arising from the monoclonal expansion of neoplastic thyrotropes. Causative oncogenes have not yet been convincingly identified. PRTH is a nonneoplastic disorder caused by inherited mutations in the gene for the thyroid hormone receptor beta; it is a poorly understood variant of GRTH. For unclear reasons, in PRTH, the pituitary gland is resistant to the feedback inhibitory effects of circulating thyroid hormones while peripheral tissues respond normally, causing patients to experience the toxic peripheral effects of thyroid hormone excess. TSHomas are best treated by transphenoidal surgical removal. Radiotherapy is indicated for inoperable or incompletely resected tumors. Octreotide administration is a useful adjunct for preoperatively reducing tumor size and for the medical management of surgical treatment failures. PRTH is ideally treated by chronically suppressing TSH secretion with medications such as D-thyroxine, TRIAC, octreotide, or bromocriptine. If such therapy is ineffective or unavailable, thyroid ablation with radioiodine or surgery may be employed with subsequent close monitoring of both thyroid hormone status and pituitary gland size. PMID:9534036

McDermott, M T; Ridgway, E C

1998-03-01

259

Neuropsychology Central  

NSDL National Science Digital Library

Neuropsychology Central is devoted to the subject of - "Neuropsychology, a new branch of science with the specific and unique aim of investigating the role of individual brain systems in complex forms of mental activity." - A.R. Luria "The Working Brain" The page aims to describe the importance of neuropsychology as a science of brain and behavior, and to act as a resource for the professional and layperson alike. See links to current technology for brain imaging, and sections covering different aspects of this ever growing field such as cognitive, developmental, and geriatric Neuropsychology. In addition, a reader survey is included to facilitate the expansion of the site.

Browndyke, J. N.

2007-03-24

260

Sonnet Central  

NSDL National Science Digital Library

Created by a dedicated sonnet aficionado, Sonnet Central is not intended for the scholar, per se, but for the reader, the Internaut with a weakness for poetry. The site contains a collection of English-language sonnets, grouped by period and region or by author, and modernized for contemporary readers. Pictures, contemporaneous critical works, a bibliography, and audio files of readings of selected poems complement the sonnets, some of which are maintained off-site (many at the University of Toronto). From Shakespeare to Wilfred Owen, selections from many well-known sonneteers are here alongside those of their less famous contemporaries.

261

Tracking protein aggregate interactions  

PubMed Central

Amyloid fibrils share a structural motif consisting of highly ordered ?-sheets aligned perpendicular to the fibril axis.1, 2 At each fibril end, ?-sheets provide a template for recruiting and converting monomers.3 Different amyloid fibrils often co-occur in the same individual, yet whether a protein aggregate aids or inhibits the assembly of a heterologous protein is unclear. In prion disease, diverse prion aggregate structures, known as strains, are thought to be the basis of disparate disease phenotypes in the same species expressing identical prion protein sequences.4–7 Here we explore the interactions reported to occur when two distinct prion strains occur together in the central nervous system.

Bartz, Jason C; Nilsson, K Peter R

2011-01-01

262

Aging in large CDF tracking chambers  

SciTech Connect

The experience of the Collider Detector at Fermilab (CDF) with aging in the large axial drift chamber responsible for tracking in the central region is presented. Premature aging in the Run 1 chamber was observed after only 0.02 C/cm. After cleaning much of the gas system and making modifications to reduce aerosols from the alcohol bubbler, the observed aging rate fell dramatically in test chambers. Considerable effort has been made to better understand the factors that affect aging since the replacement chamber for Run 2 will accumulate about 1.0 C/cm. Current test chambers using the full CDF gas system show aging rates of less than 5%/C/cm.

M. Binkley et al.

2001-03-19

263

Analysis of SILEX tracking sensor performance  

NASA Astrophysics Data System (ADS)

Two tracking sensor breadbroads have been developed for the European SILEX program. Critical requirements to be met by these sensors include the determination of the 1-sigma position of the focused laser spot on the detector surface to accuracies of less than 100 nm, with update frequencies as high as 8 kHz, and the minimum optical power level of 110 pW. The design is based on the use of a 14 x 14 pixel CCD array, where the spot position is determined to small subpixel accuracies over the central 2 x 2 pixel area via a centroiding algorithm executed in a microprocessor. Coarse position measurements are also made over the full area at rates up to 2 kHz.

Mathur, Rajul P.; Beard, Christopher I.; Purll, David J.

1990-07-01

264

Multitarget tracking algorithm performance evaluation  

NASA Astrophysics Data System (ADS)

This paper discusses some problems in evaluating the performance of multi-target tracking (MTT) systems. Various performance measures for the MTT systems are first described. These include: correlation statistics; track purity; track maintenance statistics; and kinematic statistics. Examples of single measures of performance are also given. The issues involved in the analytical prediction of performance are briefly discussed. Detailed descriptions of the computer simulation evaluation for the MTT systems include: test scenario selection, sensor modeling, data collection and the analysis of results. Two performam evaluation methods, namely: a two step method and a track classification approach are explored in this paper. The performam evaluation techniques are being incorporated in a MTT testbed developed in the Department of Electrical and Computer Engineering at the Royal Military College of Canada, Kingston, Ontario, Canada.

Zheng, H.; Farooq, Mohamad; Main, Rick R.

1999-03-01

265

Calendars: Keeping Track of Time  

NSDL National Science Digital Library

NOVA Australia, an initiative of the Australian Academy of Science, posts new feature articles regularly. These publications include "Calendars: keeping track of time," describing the history of the Western calendar.

1999-01-01

266

Tracking Code for Microwave Instability  

SciTech Connect

To study microwave instability the tracking code is developed. For bench marking, results are compared with Oide-Yokoya results [1] for broad-band Q = 1 impedance. Results hint to two possible mechanisms determining the threshold of instability.

Heifets, S.; /SLAC

2006-09-21

267

The Physics of Fast Track  

ERIC Educational Resources Information Center

|Toys can provide motivational contexts for learning and teaching about physics. A cheap car track provides an almost frictionless environment from which a quantitative study of conservation of energy and circular motion can be made.|

Kibble, Bob

2007-01-01

268

Durability Testing of Tracked Vehicles.  

National Technical Information Service (NTIS)

The object of the Materiel Test Procedure is to determine the ability of military tracked vehicles to operate under various controlled ground-surface and environmental conditions for a predetermined number of hours, miles, etc. (Author)

1966-01-01

269

Odd tracks at hadron colliders.  

PubMed

New physics that exhibits irregular tracks such as kinks, intermittent hits, or decay in flight may easily be missed at hadron colliders. We demonstrate this by studying viable models of light, O(10??GeV), colored particles that decay predominantly inside the tracker. Such particles can be produced at staggering rates, and yet, may not be identified or triggered on at the LHC, unless specifically searched for. In addition, the models we study provide an explanation for the original measurement of the anomalous charged track distribution by CDF. The presence of irregular tracks in these models reconcile that measurement with the subsequent reanalysis and the null results of ATLAS and CMS. Our study clearly illustrates the need for a comprehensive study of irregular tracks at the LHC. PMID:22861836

Meade, Patrick; Papucci, Michele; Volansky, Tomer

2012-07-17

270

Map projections for satellite tracking.  

USGS Publications Warehouse

New map projections to be used for plotting successive satellite groundtracks show these tracks as straight lines. The map may be made conformal along any 2 parallels of latitude between the limits of latitude reached by the groundtrack, or the 'tracking limits'. If these parallels are equidistant from the Equator, they may both be made true to scale, and a cylindrical projection results. If these parallels are not equidistant from the Equator, only one may be made true to scale, and a conic projection results. The groundtracks generally have sharp breaks at either tracking limit. If the tracking limit is one of the parallels at which the map is conformal, there is no break in the groundtrack, and the conic projection may approach (but cannot become) an azimuthal projection.-Author

Snyder, J. P.

1981-01-01

271

Multitarget tracking using optical processing  

NASA Astrophysics Data System (ADS)

The SDIO multitarget tracking optical system is described. It involves point target detection and localization of sub-pixel targets below the noise level (using an optical correlator), track initiation (using an optical Hough transform), data association (using an optical neural net), a simple estimator (alpha, beta, gamma tracker), and inherent error correction (in the full modular system). New algorithms and optical architectures were devised, and real ISTEF data was processed on real-time optical laboratory systems.

Casasent, David

1991-08-01

272

Object Tracking on Embedded Hardware  

Microsoft Academic Search

Object tracking is an extensively researched subject within the field of computer vision, in reference to the large number\\u000a of published contributions in major computer vision conference proceedings and journals every year. This chapter presents\\u000a object tracking achievements over the past years as well as research trends. It attempts to give a structured overview of\\u000a a broad spectrum of modern

Gustavo Fernández Domínguez; Csaba Beleznai; Martin Litzenberger; Tobi Delbrück

273

Recent advances in track physics  

SciTech Connect

This volume contains the texts of the 17 invited papers presented at the Track Physics Conference held on the campus of the University of Nebraska, in Lincoln, during 18--20 October 1988. The conference brought together researchers from throughout the world who specialize in the study of the structure of particle tracks and its influence upon atomic physics, particle detection, radiation chemistry and radiobiology. Each paper is indexed separately on the energy data base.

Benton, E.V. (San Francisco Univ., CA (USA). Dept. of Physics); Starace, A.F. (eds.) (Nebraska Univ., Lincoln, NE (USA). Dept. of Physics and Astronomy)

1989-01-01

274

Bad news for tracking quintessence  

NASA Astrophysics Data System (ADS)

A recent global fit to the cosmological parameters shows that the smooth energy is static (cosmological constant) or nearly static EOS parameter w = P/? < 0.85 (1?). For Tracking Quintessence, this implies that the potential is now slow-rolling. If it exists, such Quintessence is practically indistinguishable from a cosmological constant and is not tracking, i.e. the present Universe is sensitive to initial conditions, thus removing the theoretical motivation for Quintessence, in the first place.

Bludman, S. A.

275

Environmental exposure tracking sensor  

NASA Astrophysics Data System (ADS)

Cornerstone Research Group Inc. (CRG) has developed environmental exposure tracking (EET) sensors using shape memory polymer (SMP) to monitor the degradation of perishable items, such as munitions, medicines or foods, by measuring the cumulative exposure to temperature and moisture. SMPs are polymers whose qualities have been altered to give them dynamic shape "memory" properties. Under thermal or moisture stimuli, SMP exhibits a radical change from a rigid thermoset to a highly flexible, elastic state. The dynamic response of the SMP can be tailored to match the degradation profile of the perishable item. SMP-based EET sensors require no digital memory or internal power supply and provide the capability of inexpensive, long-term life cycle monitoring thermal and moisture exposure over time. In a Phase I and II SBIR effort with the Navy, CRG demonstrated the feasibility of SMP-based EET sensor with two material systems. These material systems required different activation stimuli, heat or water vapor pressure. CRG developed the ability to tailor these materials to customize the dynamic response to match various degradation profiles of munitions. CRG optimized and characterized the SMP formulations and sensor design configuration to develop a suite of data from which any degradation profile can be met. CRG's EET sensors are capable of monitoring temperatures from -30 °C to 260 °C. The prototypes monitor cumulative thermal exposure and provide real-time information in a visually readable or a remotely interrogated version. CRG is currently scaling up the manufacture of the sensors for munitions reliability applications with the Navy.

Havens, Teresa; Everhart, Joel; McFerran, Jace

2009-03-01

276

Stability of continuous welded rail track  

Microsoft Academic Search

As the use of continuous welded rail (CWR) increases in track structures, derailing disasters associated with track buckling also increase in great numbers due to high compressive thermal stress. A three-dimensional CWR track model is developed in the present study to be used for extensive buckling analysis of CWR tracks subjected to temperature load. The analysis model is encoded into

Nam-Hyoung Lim; Nam-Hoi Park; Young-Jong Kang

2003-01-01

277

Probabilistic People Tracking for Occlusion Handling  

Microsoft Academic Search

This work presents a novel people tracking approach, able to cope with frequent shape changes and large occlusions. In particular, the tracks are described by means of probabilistic masks and appearance models. Occlusions due to other tracks or due to background objects and false occlusions are discriminated. The tracking system is general enough to be applied with any motion segmentation

Rita Cucchiara; Costantino Grana; Giovanni Tardini; Roberto Vezzani

2004-01-01

278

Modelling tracks for roller coaster dynamics  

Microsoft Academic Search

In this work, an appropriate methodology for the accurate description of three dimensional track geometries, in the framework of multibody dynamics, is developed and implemented. Cubic splines, Akima splines and shape preserving splines are used as alternative track parameterization methods. The track centerline description uses Frenet frames that provide the track referential at every point. A pre-processor is used to

Joao Pombo; Jorge Ambrósio

2007-01-01

279

An Effective Algorithm of News Topic Tracking  

Microsoft Academic Search

Topic tracking is to track trend of news topic, which people are interested in. It is a very pragmatic method in information retrieval. Compared with keywords retrieval, topic tracking excels in dynamic tracking based on text model and its content understanding, so it is mostly involved in text expressing and semantic understanding. LS-SVM, as a new method for news topic

Xianfei Zhang; Zhigang Guo; Bicheng Li

2009-01-01

280

49 CFR 213.359 - Track stiffness.  

Code of Federal Regulations, 2012 CFR

...so that the track shall return following maximum load to a configuration in compliance with the vehicle/track interaction safety...deformations so that track shall return following maximum load to a configuration in compliance with the vehicle/track interaction...

2012-10-01

281

Event Recognition with Fragmented Object Tracks  

Microsoft Academic Search

Complete and accurate video tracking is very difficult to achieve in practice due to long occlusions, traffic clutter, shadows and appearance changes. In this paper, we study the feasibility of event recognition when object tracks are fragmented. By changing the lock score threshold control- ling track termination, different levels of track fragmenta- tion are generated. The effect on event recognition

Michael T. Chan; Anthony Hoogs; Zhaohui Sun; John Schmiederer; Rahul Bhotika; Gianfranco Doretto

2006-01-01

282

Central hypothyroidism  

PubMed Central

Central hypothyroidism is defined as hypothyroidism due to insufficient stimulation by thyroid stimulating hormone (TSH) of an otherwise normal thyroid gland. It has an estimated prevalence of approximately 1 in 80,000 to 1 in 120,000. It can be secondary hypothyroidism (pituitary) or tertiary hypothyroidism (hypothalamus) in origin. In children, it is usually caused by craniopharyngiomas or previous cranial irradiation for brain tumors or hematological malignancies. In adults, it is usually due to pituitary macroadenomas, pituitary surgeries or post-irradiation. Fatigue and peripheral edema are the most specific clinical features. Diagnosis is established by the presence of normal to low-normal TSH on the background of low-normal thyroid hormones, confirmed by the thyrotropin releasing hormone stimulation test. Therapy includes use of levothyroxine titrated to improvement in symptomology and keeping free T4 in the upper limit of normal reference range.

Gupta, Vishal; Lee, Marilyn

2011-01-01

283

Today's central receiver power plant  

SciTech Connect

For 15 years, the United States Department of Energy has worked with industry, both utilities and manufacturers, to develop the technology of solar central receiver power plants. In this type of plant, sunlight is concentrated by a field of sun-tracking mirrors, called heliostats, onto a centrally located receiver. The solar energy is collected in the form of a heated fluid, which is used to generate steam to power a conventional turbine generator. For a number of reasons, molten nitrate salt is now the preferred heat transfer fluid. Commercial plants will be sized between 100 and 200 MW. The impetus for developing central receivers comes from their unique advantages: (1) They produce clean, reliable, low-cost electricity; (2) they have practical energy storage that provides a high degree of dispatchability (annually up to 60%) -- without fossil fuels; and, (3) they are environmentally benign. Development efforts around the world have brought the technology to the brink of commercialization: The technical feasibility has been proven, and cost, performance, and reliability can be confidently predicted. Plans are currently being developed for the final steps toward commercial central receiver power plants. 24 refs., 7 figs.

Alpert, D.J.; Kolb, G.J.; Chavez, J.M.

1991-01-01

284

The CDF silicon vertex tracker: Online precision tracking of the CDF silicon vertex  

SciTech Connect

The Silicon Vertex Tracker is the CDF online tracker which will re- construct 2D tracks using hit positions measured by the Silicon Vertex Detector and Central Outer Chamber tracks found by the eXtremely Fast Tracker. The precision measurement of the track impact parameter will allow triggering on events contain- ing B hadrons. This will allow the investigation of several important problems in B physics, like CP violation and Bs mixing, and to search for new heavy particles decaying to b{anti b}.

W. Ashmanskas et al.

1999-08-24

285

The CDF silicon vertex tracker: Online precision tracking of the CDF silicon vertex detector  

SciTech Connect

The Silicon Vertex Tracker is the CDF online tracker which will re- construct 2D tracks using hit positions measured by the Silicon Vertex Detector and Central Outer Chamber tracks found by the eXtremely Fast Tracker. The precision measurement of the track impact parameter will allow triggering on events contain- ing B hadrons. This will allow the investigation of several important problems in B physics, like CP violation and Bs mixing, and to search for new heavy particles decaying to b{anti b} .

W. Ashmanskas et al.

1999-09-17

286

UUV-platform cooperation in covert tracking  

NASA Astrophysics Data System (ADS)

In underwater tracking, such as with an unmanned undersea vehicle (UUV) or torpedo it is advantageous to track a target covertly. The Maximum Likelihood-Probabilistic Data Association (ML-PDA) tracking algorithm, which has been demonstrated to establish and maintain track in low SNR/high clutter environments, is used to develop track information in a covert tracking application. By combining intermittent sensor data (active sonar) from the UUV with that of the launch platform (passive sonar) in the ML-PDA track algorithm, fewer active transmissions are required to establish and maintain a given track accuracy thereby reducing the chance of target alertment. We show that this is a viable operating model and demonstrate how sensor placement affects track accuracy, including determination of best sensor placement and requirements on active transmissions to maintain minimum tracking accuracy.

Blanding, Wayne R.; Willett, Peter K.; Bar-Shalom, Yaakov; Lynch, Robert S.

2005-09-01

287

TRACK MODULUS MEASUREMENT FROM A MOVING RAILCAR  

Microsoft Academic Search

Track modulus is an important parameter in track quality and performance. Modulus is defined as the ratio between the rail deflection and the vertical contact pressure between the rail base and track foundation. This paper describes the design of a system for on-board, real-time, non-contact measurement of track modulus. Measuring track modulus from a moving rail car is non-trivial because

Brian McVey; Shane Farritor; Chris Norman; Nathan Wood; Richard Arnold; Mahmood Fateh; Magdy El-Sibaie

288

Sensing Technologies for Railway Track Maintenance  

NASA Astrophysics Data System (ADS)

Railway track is has unique character that it deforms gradually under repetitive train passage. It is no exaggeration to say that track technology is essentially maintenance technology. To maintain sufficient track condition for train running safety and passenger riding comfort, various kinds of inspection are carried with various methods. This paper introduces the state-of-the-art sensing technologies applied for track maintenance. We hope this information will inspire engineers in sensing technology field to develop new application for future track maintenance.

Takai, Hideyuki

289

Tracking scanning laser ophthalmoscope (TSLO)  

NASA Astrophysics Data System (ADS)

The effectiveness of image stabilization with a retinal tracker in a multi-function, compact scanning laser ophthalmoscope (TSLO) was demonstrated in initial human subject tests. The retinal tracking system uses a confocal reflectometer with a closed loop optical servo system to lock onto features in the fundus. The system is modular to allow configuration for many research and clinical applications, including hyperspectral imaging, multifocal electroretinography (MFERG), perimetry, quantification of macular and photo-pigmentation, imaging of neovascularization and other subretinal structures (drusen, hyper-, and hypo-pigmentation), and endogenous fluorescence imaging. Optical hardware features include dual wavelength imaging and detection, integrated monochromator, higher-order motion control, and a stimulus source. The system software consists of a real-time feedback control algorithm and a user interface. Software enhancements include automatic bias correction, asymmetric feature tracking, image averaging, automatic track re-lock, and acquisition and logging of uncompressed images and video files. Normal adult subjects were tested without mydriasis to optimize the tracking instrumentation and to characterize imaging performance. The retinal tracking system achieves a bandwidth of greater than 1 kHz, which permits tracking at rates that greatly exceed the maximum rate of motion of the human eye. The TSLO stabilized images in all test subjects during ordinary saccades up to 500 °/sec with an inter-frame accuracy better than 0.05 °. Feature lock was maintained for minutes despite subject eye blinking. Successful frame averaging allowed image acquisition with decreased noise in low-light applications. The retinal tracking system significantly enhances the imaging capabilities of the scanning laser ophthalmoscope.

Hammer, Daniel X.; Ferguson, R. Daniel; Magill, John C.; White, Michael A.; Elsner, Ann E.; Webb, Robert H.

2003-07-01

290

Central Cord Syndrome  

MedlinePLUS

NINDS Central Cord Syndrome Information Page Synonym(s): Central Cervical Cord Syndrome Table of Contents (click to jump to sections) ... is being done? Clinical Trials Organizations What is Central Cord Syndrome? Central cord syndrome is the most ...

291

Central Pain Syndrome  

MedlinePLUS

NINDS Central Pain Syndrome Information Page Table of Contents (click to jump to sections) What is Central Pain Syndrome? ... is being done? Clinical Trials Organizations What is Central Pain Syndrome? Central pain syndrome is a neurological ...

292

Feature Tracking Using Reeb Graphs  

SciTech Connect

Tracking features and exploring their temporal dynamics can aid scientists in identifying interesting time intervals in a simulation and serve as basis for performing quantitative analyses of temporal phenomena. In this paper, we develop a novel approach for tracking subsets of isosurfaces, such as burning regions in simulated flames, which are defined as areas of high fuel consumption on a temperature isosurface. Tracking such regions as they merge and split over time can provide important insights into the impact of turbulence on the combustion process. However, the convoluted nature of the temperature isosurface and its rapid movement make this analysis particularly challenging. Our approach tracks burning regions by extracting a temperature isovolume from the four-dimensional space-time temperature field. It then obtains isosurfaces for the original simulation time steps and labels individual connected 'burning' regions based on the local fuel consumption value. Based on this information, a boundary surface between burning and non-burning regions is constructed. The Reeb graph of this boundary surface is the tracking graph for burning regions.

Weber, Gunther H.; Bremer, Peer-Timo; Day, Marcus S.; Bell, John B.; Pascucci, Valerio

2010-08-02

293

Track structure in biological models.  

PubMed

High-energy heavy ions in the galactic cosmic radiation (HZE particles) may pose a special risk during long term manned space flights outside the sheltering confines of the earth's geomagnetic field. These particles are highly ionizing, and they and their nuclear secondaries can penetrate many centimeters of body tissue. The three dimensional patterns of ionizations they create as they lose energy are referred to as their track structure. Several models of biological action on mammalian cells attempt to treat track structure or related quantities in their formulation. The methods by which they do this are reviewed. The proximity function is introduced in connection with the theory of Dual Radiation Action (DRA). The ion-gamma kill (IGK) model introduces the radial energy-density distribution, which is a smooth function characterizing both the magnitude and extension of a charged particle track. The lethal, potentially lethal (LPL) model introduces lambda, the mean distance between relevant ion clusters or biochemical species along the track. Since very localized energy depositions (within approximately 10 nm) are emphasized, the proximity function as defined in the DRA model is not of utility in characterizing track structure in the LPL formulation. PMID:11537218

Curtis, S B

1986-01-01

294

The Central laser facility at the Pierre Auger Observatory  

SciTech Connect

The Central Laser Facility is located near the middle of the Pierre Auger Observatory in Argentina. It features a UV laser and optics that direct a beam of calibrated pulsed light into the sky. Light scattered from this beam produces tracks in the Auger optical detectors which normally record nitrogen fluorescence tracks from cosmic ray air showers. The Central Laser Facility provides a ''test beam'' to investigate properties of the atmosphere and the fluorescence detectors. The laser can send light via optical fiber simultaneously to the nearest surface detector tank for hybrid timing analyses. We describe the facility and show some examples of its many uses.

Arqueros, F.; Bellido, J.; Covault, C.; D'Urso, D.; Di Giulio, C.; Facal, P.; Fick, B.; Guarino, F.; Malek, M.; Matthews, J.A.J.; Matthews, J.; Meyhandan, R.; Monasor, M.; Mostafa, M.; Petrinca, P.; Roberts, M.; Sommers, P.; Travnicek, P.; Valore, L.; Verzi, V.; Wiencke, Lawrence; /Utah U.

2005-07-01

295

Movement and Dispersal Patterns of Immature Gray Squirrels (Sciurus Carolinesis) in East-Central Minnesota.  

National Technical Information Service (NTIS)

Movements of immature gray squirrels and their mothers were monitored via an automatic radio tracking system in east-central Minnesota from the time of the juveniles' emergence until their dispersal. Eleven juveniles and three adult females were observed....

J. Gull

1977-01-01

296

Central waste complex Dose Equivalent Curie estimate for packages not included in building inventory.  

National Technical Information Service (NTIS)

This document estimates the Dose Equivalent Curie content of the packages not included in the building inventory because they contain less than A-2 limits. The inventory of radioisotopes in the Central Waste Complex (CWC) are controlled and tracked using ...

C. L. Stratman

1994-01-01

297

Structural and metric correlation of electro-optical and radar generated tracks  

NASA Astrophysics Data System (ADS)

Integration of electro-optical and radar generated tracks is critical for identifying accurate time and space position information in target tracking and providing a single integrated picture (SIP) of the dynamic situation. This paper proposes a new, robust, real-time algorithm to (i) correctly correlate data from several sensors and the existing system track, (ii) improve target tracking accuracy and (iii) identify when the data represent new tracks. The proposed algorithm uses metric data, linear, and area features extracted from optical and radar images. The major novelty of the algorithm is in use of robust and affine invariant structural relations built on the features for accurate correlation. These features are combined with intelligent adaptation of Kalman filter using Neural Networks. A proposed measure of confidence with the correlation decision is based on both structural and metric similarities of tracks to estimate both bias and random errors. The similarities are based on concepts from the abstract algebraic systems, generalized Gauss-Markov stochastic processes, and Kalman filters for n-dimensional time series that explicitly model measurement dependence on k previous measurements, M(t/t-1,t-2,...,t-k). These techniques are naturally combined with the hierarchical matching approach to increase the overall track accuracy. The proposed approach and algorithm for track correlation/matching is suitable for both centralized and distributed computing architecture.

Kovalerchuk, Boris

2007-04-01

298

AHF Booster Tracking with SIMPSONS.  

SciTech Connect

The booster lattice for the Advanced Hydrotest Facility at Los Alamos was tracked in 3-D with the program SIMPSONS, using the full, symplectic lattice from TEAPOT, using the full set of magnet and misalignment errors, as well as full space-charge effects. The only corrections included were a rough closed-orbit correction and chromaticity correction. The lattice was tracked for an entire booster cycle, from multi-turn injection through acceleration to the top energy of 4 GeV, approximately 99,000 turns. An initial injection intensity of 4x1Ol2, injected in 25 turns, resulted in a final intensity of 3 . 2 {approx} 1 0a' {approx}t 4 GeV. Results of the tracking, including emittance growth, particle loss, and particle tune distributions are presented.

Johnson, D. E. (David E.); Neri, F. (Filippo)

2002-01-01

299

Automatic heliostat track alignment method  

SciTech Connect

This patent describes a heliostat alignment method consisting of a number of steps. The first step consists of commanding a sunbeam centroid to a target location to establish a reference position. The next step searches for the actual sunbeam centroid position and determines the sunbeam centroid position error. These actions are followed by the analysis of the sunbeam centroid position error, correlating the sunbeam position error to errors in a heliostat reference system, and changing the heliostat reference system to correct for track misalignment in order to establish a revised heliostat reference system. The final step is changing the track alignment based on the revised heliostat reference system to a new position to correct the track misalignment.

Not Available

1986-01-14

300

MANTRACK. Controlled Document Tracking Software  

SciTech Connect

MANTRACK is an automated, controlled document tracking system which does the following and reduces staff time required to perform these tasks: generates transmittal letters/receipts for every controlled copy issued (merged from a current distribution list), tracks the return of transmittal receipts, facilitates the check-in of the large number of transmittal receipts returned (using a barcode reader), generates a reminder list which prompts the cyclic review and evaluation of existing documents, generates overdue reminders for the return of past-due transmittal receipts, tracks the number of Procedure Change Directives (PCD) currently in effect for each procedure, generates and maintains current distribution lists for each document, generates a current table of contents when updates to the document (usually a procedure manual) are made.

Gibson, R.E.; Haas, R. [Oak Ridge National Lab., TN (United States)

1992-06-01

301

Front tracking for gas dynamics  

SciTech Connect

Front tracking is an adaptive computational method in which a lower dimensional moving grid is fitted to and follows the dynamical evolution of distinguished waves in a fluid flow. The method takes advantage of known analytic solutions, derived from the Rankine-Hugoniot relations, for idealized discontinuities. In this paper the method is applied to the Euler equations describing compressible gas dynamics. The main thrust here is validation of the front tracking method: we present results on a series of test problems for which comparison answers can be obtained by independent methods.

Chern, I.L.; Glimm, J.; McBryan, O.; Plohr, B.; Yaniv, S.

1984-05-01

302

Subspace tracking with quasi-rectangular data windows  

NASA Astrophysics Data System (ADS)

In signal processing, it is often necessary to decompose sampled data into its principal components. In adaptive sensor array processing, for example, Singular Value Decomposition (SVD) and/or Eigenvalue Decomposition (EVD) can be used to separate sensor data into "signal" and "noise" subspaces. Such decompositions are central to a number of techniques, such as MUSIC, ESPIRIT, and the Eigencanceller. Unfortunately, SVD and EVD algorithms are computationally intensive. When the underlying signals are nonstationary, "fast subspace tracking" methods provide a far less complex alternative to standard SVD methods. This paper addresses a class of subspace tracking methods known as "QR-Jacobi methods." These methods can track the r principal eigenvectors of a correlation matrix in O(Nr) operations, where N is the dimensionality of the correlation matrix. Previously, QR-Jacobi methods have been formulated to track the principal eigenvectors of an "exponentially windowed" data correlation matrix. Finite duration data windowing strategies were not addressed. This paper extends the prior QR-Jacobi methods so as to implement rectangular sliding data windows, as well as other windows. Illustrated examples are provided.

Rabideau, Daniel J.

2003-08-01

303

USA Track & Field Coaching Manual. USA Track & Field.  

ERIC Educational Resources Information Center

|This book presents comprehensive, ready-to-apply information from 33 world-class coaches and experts about major track and field events for high school and college coaches. The volume features proven predictive testing procedures; detailed event-specific technique instruction; carefully crafted training programs; and preparation and performance…

USA Track and Field, Inc., Indianapolis, IN.

304

Patrol car and agent tracking\\/suspect tagging and tracking  

Microsoft Academic Search

Emerging technologies in the field of law enforcement are providing today's law enforcement personnel with the advantage of an innovative and faster means of providing safety and service to the public. The use of open such technology, the Automatic Vehicle Locator (AVL) tracking device, is fast becoming a commonplace and cost-effective solution for agencies to efficiently command and control their

Steven C. Wilkins

1997-01-01

305

Robotic vehicle with multiple tracked mobility platforms  

SciTech Connect

A robotic vehicle having two or more tracked mobility platforms that are mechanically linked together with a two-dimensional coupling, thereby forming a composite vehicle of increased mobility. The robotic vehicle is operative in hazardous environments and can be capable of semi-submersible operation. The robotic vehicle is capable of remote controlled operation via radio frequency and/or fiber optic communication link to a remote operator control unit. The tracks have a plurality of track-edge scallop cut-outs that allow the tracks to easily grab onto and roll across railroad tracks, especially when crossing the railroad tracks at an oblique angle.

Salton, Jonathan R. (Albuquerque, NM); Buttz, James H. (Albuquerque, NM); Garretson, Justin (Albuquerque, NM); Hayward, David R. (Wetmore, CO); Hobart, Clinton G. (Albuquerque, NM); Deuel, Jr., Jamieson K. (Albuquerque, NM)

2012-07-24

306

Front Tracking for Gas Dynamics.  

National Technical Information Service (NTIS)

Front tracking is an adaptive computational method in which a lower dimensional moving grid is fitted to and follows the dynamical evolution of distinguished waves in a fluid flow. The method takes advantage of known analytic solutions, derived from the R...

I. L. Chern J. Glimm O. McBryan B. Plohr S. Yaniv

1984-01-01

307

Recognizing and Tracking Human Action  

Microsoft Academic Search

Human activity can be described as a sequence of 3D body postures. The traditional approach to recognition and 3D reconstruction of human activity has been to track motion in 3D, mainly using advanced geometric and dynamic models. In this paper we reverse this process. View based activity recognition serves as an input to a human body location tracker with the

Josephine Sullivan; Stefan Carlsson

2002-01-01

308

Keep Track of Many Things.  

National Technical Information Service (NTIS)

Recent laboratory research on man's ability to keep track mentally of rapidly changing situations has been reviewed, and analogies to the real world have been drawn to illustrate the relevance of the information gleaned. The implications of the work for p...

R. A. Monty

1974-01-01

309

Ship Tracks South of Alaska  

NSDL National Science Digital Library

This page from NASA's Earth Observatory shows images of visible tracks made in the Earth's atmosphere from clouds forming around ship exhaust particles. One of these images shows the relative sizes of the particles, and the text relates the relative sizes to the relative brightness of the clouds that are formed.

2009-05-27

310

Tracked Vehicle Road Wheel Puller.  

National Technical Information Service (NTIS)

A wheel-puller assembly is for forcibly removing a road wheel from a hub and axle associated with a tracked vehicle. The road wheel further includes outer and inner wheel components bolted to a circular array of lugs extending from the vehicle hub. The as...

J. W. Pharaon

2009-01-01

311

Referent Tracking for Corporate Memories  

Microsoft Academic Search

Corporate memories (CM) are information systems designed to keep track of the history and evolution of an enterprise with the goal of using past experience to enhance performance in the future. Well designed CMs should contain data about both the enterprise and the environment in which it operates. The former, traditionally embodied in what is referred to as an 'enterprise

Werner CEUSTERS; Barry SMITH

312

Investigative Tracking in Library Evaluation.  

ERIC Educational Resources Information Center

|A pilot study of the use of an investigative journalism document-tracking procedure in the evaluation of library operations is discussed. The technique provides a straightforward but powerful method of evaluation that is equally applicable in simple studies and complex investigations. (Author/AL)|

Smith, Nick L.

1982-01-01

313

Comparison of Tracking Test Methods  

Microsoft Academic Search

A selection of epoxy specimens has been subjected to a number of different tests for track resistance. The degree of agreement between testing agencies using the same method, and between the different test methods is described. Generally speaking, those methods, which impose alternate wet-dry cycles, or otherwise simulate the \\

Mo Kurtz

1971-01-01

314

Tracking Alcohol Consumption Over Time  

Microsoft Academic Search

Researchers are tracking long-term changes in alcohol consumption and related behaviors or outcomes in order to detect trends in the entire population or certain subgroups, test models of alcohol-related outcomes, and understand the consequences of interventions. Such analyses must consider the complexity of typical lifetime consumption patterns. Major approaches to measuring alcohol consumption over time include aggregate measures of consumption

Thomas K. Greenfield; William C. Kerr

315

Improved Doppler Tracking System (Idts).  

National Technical Information Service (NTIS)

The effort involves a study/analysis of the feasibility of an improved doppler tracking system (IDTS), as well as recommendations for equipment needed for a working system. The primary emphasis of the task was the analysis and selection of the best minico...

B. L. Myers J. A. Cali J. H. Stebel

1970-01-01

316

Deer Tracks in the City?  

NSDL National Science Digital Library

"Why would a deer print be in the city?" wondered a student. She had noticed the track near a grocery store that morning with her mother. She was familiar with deer and had noticed their prints on a trip to a local museum; however, she had never seen a de

Rodriguez, Antonia; Quigley, Cassie F.; Buck, Gayle; Riggs, Morgan; Beeman-Cadwallader, Nicole

2009-10-01

317

The SDC silicon tracking system  

NASA Astrophysics Data System (ADS)

The silicon tracking system is a critical element of the tracking system of the Solenoidal Detector Collaboration's (SDC) experiment to meet the physics requirements at the Superconducting Super Collider (SSC). It will provide full-pattern recognition, vertexing, and stand-alone momentum measurement capabilities complementing the outer tracker. The key component of the system is a double-sided silicon microstrip sensor (DSSS) with fast-readout front-end electronics. The SDC DSSS design addresses problems associated with radiation damage on the surface and in the bulk of the silicon microstrip sensors. The SDC silicon tracking system, being the largest semiconductor tracking detector ever planned, requires a state-of-the-art design of the electromechanical system in order to minimize the dead regions, minimize the radiation length, cool and operate the system at 0°C, and have the mechanical precision necessary to match the spatial resolution of the microstrip sensors. The silicon ladders, shells, space frames, and butane evaporative cooling system are achieving the requirements imposed by the goals of the SDC experiment.

Unno, Y.

1994-03-01

318

Tracking Success in Youth Employment.  

ERIC Educational Resources Information Center

Youthwork, Incorporated, was created by the Youth Employment and Demonstration Projects Act of 1977 (YEDPA) to keep track of youth employment and training programs. Privately-owned Youthwork administers federal demonstration grants across the country to help provide job guidance, work experience credit, private sector involvement, and…

Rieder, Corinne H.

1979-01-01

319

On the TREC Blog Track  

Microsoft Academic Search

The rise of blogging as a new grassroots publishing medium and the many interesting peculiarities that characterise blogs compared to other genres of documents opened up several new interesting research areas in the information retrieval field. The Blog track was introduced in 2006 as part of the renowned Text REtrieval Conference (TREC) evaluation fo- rum, to drive research on the

Iadh Ounis; Ian Soboroff

2008-01-01

320

Tracking Decision Makers under Uncertainty  

Microsoft Academic Search

Eye tracking is used to investigate the procedures that participants employ in choosing between two lotteries. Eye movement patterns in problems where the deliberation process is clearly identified are used to substantiate an interpretation of the results. The data provide little support for the hypothesis that decision makers rely exclusively upon an expected utility type of calculation. Instead eye patterns

Amos Arieli; Yaniv Ben-Ami; Ariel Rubinstein

2011-01-01

321

RFID for personal asset tracking  

Microsoft Academic Search

The proposed mobile device uses radio frequency identification (RFID) to keep track of registered objects that are within range of the user. The goal is to provide a new security solution for keeping belongings that are carried around. The device consists of a mobile RFID reader and a control program with a graphical user interface. The assets are attached with

S. Chan; A. Connell; R. Kamoua

2009-01-01

322

Haptic Tracking Permits Bimanual Independence  

ERIC Educational Resources Information Center

This study shows that in a novel task--bimanual haptic tracking--neurologically normal human adults can move their 2 hands independently for extended periods of time with little or no training. Participants lightly touched buttons whose positions were moved either quasi-randomly in the horizontal plane by 1 or 2 human drivers (Experiment 1), in…

Rosenbaum, David A.; Dawson, Amanda A.; Challis, John H.

2006-01-01

323

NLP Track at TREC-5.  

National Technical Information Service (NTIS)

The Natural Language Processing (NLP) track was organized for the first time at TREC-5 to provide a more focused look at how NLP techniques can improve performance in information retrieval (IR). The intent was to see if the NLP techniques available today ...

K. S. Jones T. Strzalkowski

1996-01-01

324

Etching fission tracks in zircons  

USGS Publications Warehouse

A new technique has been developed whereby fission tracks can be etched in zircon with a solution of sodium hydroxide at 220??C. Etching time varied between 15 minutes and 5 hours. Colored zircon required less etching time than the colorless varieties.

Naeser, C. W.

1969-01-01

325

The temperature of the track  

Microsoft Academic Search

The energy deposition of swift charged particles penetrating solids is accompanied by such processes as particle (electron, atom, ion, molecular ion, photon …) emission and\\/or a change of the solid along the particle track. The energy, velocity and mass distribution of such secondary particles obtained from thin solids (such as carbon, polyhydrocarbon, isolators and conductors) penetrated by projectiles (e.g. Ar

Karl-Ontjes Groeneveld; Robert Maier; Ralf Wünsch

1995-01-01

326

Document format considerations for a document tracking and storage system  

SciTech Connect

The design and development of the detectors for the Superconducting Super Collider Laboratory (SSCL) will be facilitated by a central system to track and store the design documents and drawings. Collaborators and SSCL personnel need a single system that they can access from a terminal on their desks and use to locate and view the latest version of a document. The SSCL Physics Research Division has developed a prototype system to track documents and drawings and to make them accessible via local and wide-area networks. The prototype is being used to refine the requirements and to develop the procedures for a larger system that will be acquired later. The format for storing documents is a major challenge because there is no interoperable standard. This paper discusses the system requirements and architecture, and present results of research on standards for storing documents.

Wells, N.E.; Chow, I.; Johnson, L.D.

1991-03-01

327

Comparison of fast correlation algorithms for target tracking  

NASA Astrophysics Data System (ADS)

Laser Aided Detection and Ranging (LADAR) imaging systems can be used to provide high resolution imaging and tracking of moving targets at night. Central to the tracking system is a high speed correlation algorithm to determine target motion between sensor image frames. Several issues complicate the correlation calculations. These include coherent speckle noise and atmosphere induced scintillation of the illuminator beam. The Fitts correlation algorithm is commonly used because of its simplicity and speed. However it is only optimal when the shift between sensor frames is less than a pixel. In addition it can be sensitive to certain types of noise. Projection based phase only (PBPO) is another type of correlation algorithm that is also high speed and in many cases less sensitive to noise. In this paper we compare the Fitts algorithm with PBPO in terms of number of computations and noise immunity when used in a LADAR tracker.

Dayton, David; Allen, Jeffrey; Nolasco, Rudolph; Fertig, Gregory; Myers, Michael

2012-10-01

328

Centrality in affiliation networks  

Microsoft Academic Search

This paper discusses the conceptualization, measurement, and interpretation of centrality in affiliation networks. Although centrality is a well-studied topic in social network analysis, and is one of the most widely used properties for studying affiliation networks, virtually all discussions of centrality and centralization have concerned themselves with one-mode networks. Bonacich's work on simultaneous group and individual centralities is a notable

Katherine Faust

1997-01-01

329

Architecture for Discrete Construction Component Tracking.  

National Technical Information Service (NTIS)

Accurate and timely identification and tracking of construction components are critical to operating a well-managed and cost efficient construction project. Establishing standards to support identification and tracking technologies has the potential to en...

K. M. Furlani W. C. Stone

1999-01-01

330

Track Rehabilitation and Maintenance Research Requirements.  

National Technical Information Service (NTIS)

The Federal Railroad Administration has established a research and development program aimed at improving railroad track safety and performance. As part of the support of that earlier effort, two planning studies were performed which identified track syst...

M. J. Zobrak

1980-01-01

331

Distributed tracking with consensus on noisy time-varying graphs with incomplete data  

NASA Astrophysics Data System (ADS)

In this paper, we formulate a problem of distributed tracking with consensus on a time-varying graph with incomplete data and noisy communication links. We develop a framework to handle a time-varying network topology in which not every node has local observations to generate own local tracking estimates (incomplete data). A distributed tracking-with-consensus algorithm that is suitable for such a noisy, time-varying graph is proposed. We establish the graph conditions so that distributed consensus can be achieved in the presence of noisy communication links when the effective network graph is time-varying. The steady-state performance of the proposed distributed tracking with consensus algorithm is also analyzed and compared with that of the distributed local Kalman filtering with the centralized fusion and centralized Kalman filter. Simulation results and performance analysis of the proposed algorithm are given, showing that the proposed distributed tracking with consensus algorithm performs almost the same as the distributed local Kalman filtering with centralized fusion on noisy time-varying graphs with incomplete data, while the proposed algorithm has the additional advantages of robustness and scalability.

Ruan, Yongxiang; Jayaweera, Sudharman K.; Erwin, Richard Scott

2011-12-01

332

Orbital Evasive Target Tracking and Sensor Management  

Microsoft Academic Search

\\u000a In this chapter, we consider the sensor management problem for tracking space targets where the targets may apply evasive\\u000a maneuvering strategy to avoid being tracked by the space borne observers. We first study the case of single target tracking\\u000a by a single observer and formulate the pursuit–evasion game with complete information. Then we extend the tracking problem\\u000a to a set

Huimin Chen; Genshe Chen; Dan Shen; Erik P. Blasch; Khanh Pham

333

Concepts in real-time video tracking  

Microsoft Academic Search

This report describes the real-time video (RTV) tracking system which will be deployed at the White Sands Missile Range (WSMR) during fiscal year 1979. This tracking system utilizes a distributive array of the five high-speed microprocessors to implement a real-time tracking algorithm with sufficient intelligence to overcome the tracking problems associated with typical noisy and cluttered backgrounds encountered in WSMR

A. L. Gilbert; M. K. Giles

1978-01-01

334

Optimal tracking performance for SIMO systems  

Microsoft Academic Search

This note studies the optimal tracking problem for linear time-invariant single-input-multiple-output systems responding to a step reference signal. An integral square error criterion is used as the measure for tracking performance. Explicit expressions are developed for the optimal tracking error. These results characterize how nonsquare plants may pose additional difficulties for tracking, other than those resulted from nonminimum phase zeros

Gang Chen; Jie Chen; Rick Middleton

2002-01-01

335

Optimal geometry for oval sprint tracks.  

PubMed

Track aspect ratio is defined as the percentage of lap length devoted to turns on an oval running track. Equations based on experiments are developed to model a composite runner with a specified top speed, during an acceleration phase in the straightaways and a centripetal phase in the turns. We calculate velocity deficits for several common track sizes over the range of aspect ratios and predict that, under our assumptions, a perfect circle is the optimal track shape. PMID:2373718

Greene, P R; Monheit, M A

1990-01-01

336

Drift chamber tracking with neural networks  

SciTech Connect

We discuss drift chamber tracking with a commercial log VLSI neural network chip. Voltages proportional to the drift times in a 4-layer drift chamber were presented to the Intel ETANN chip. The network was trained to provide the intercept and slope of straight tracks traversing the chamber. The outputs were recorded and later compared off line to conventional track fits. Two types of network architectures were studied. Applications of neural network tracking to high energy physics detector triggers is discussed.

Lindsey, C.S.; Denby, B.; Haggerty, H.

1992-10-01

337

Back on Track  

NASA Astrophysics Data System (ADS)

An artificial, laser-fed star now shines regularly over the sky of Paranal, home of ESO's Very Large Telescope, one of the world's most advanced large ground-based telescopes. This system provides assistance for the adaptive optics instruments on the VLT and so allows astronomers to obtain images free from the blurring effect of the atmosphere, regardless of the brightness and the location on the sky of the observed target. Now that it is routinely offered by the observatory, the skies seem much sharper to astronomers. In order to counteract the blurring effect of Earth's atmosphere, astronomers use the adaptive optics technique. This requires, however, a nearby reference star that has to be relatively bright, thereby limiting the area of the sky that can be surveyed. To surmount this limitation, astronomers now use at Paranal a powerful laser that creates an artificial star, where and when they need it. Two of the Adaptive Optics (AO) science instruments at the Paranal observatory, NACO and SINFONI, have been upgraded to work with the recently installed Laser Guide Star (LGS; see ESO 07/06) and have delivered their first scientific results. This achievement opens astronomers' access to a wealth of new targets to be studied under the sharp eyes of AO. "These unique results underline the advantage of using a Laser Guide Star with Adaptive Optics instruments, since they could not be obtained with Natural Guide Stars," says Norbert Hubin, head of the Adaptive Optics group at ESO. "This is also a crucial milestone towards the multi-laser systems ESO is designing for the VLT and the future E-ELT" (see e.g. ESO 19/07). ESO PR Photo 27a/07 ESO PR Photo 27a/07 An Ultra Luminous Merger (NACO-LGS/VLT) The Laser Guide Star System installed at Paranal uses the PARSEC dye laser developed by MPE-Garching and MPIA-Heidelberg, while the launch telescope and the laser laboratory was developed by ESO. "It is great to see the whole system working so well together," emphasises Richard Davies, project manager of the PARSEC laser. "To test the laser guide star adaptive optics system to its limits, and even beyond, we observed a number of galaxies, ranging from a close neighbour to one that is seen when the universe was very young," explains Markus Kasper, the NACO Instrument Scientist at ESO. The first objects that were observed are interacting galaxies. The images obtained reveal exquisite details, and have a resolution comparable to that of the Hubble Space Telescope. In one case, it was possible to derive for the first time the motion of the stars in two merging galaxies, showing that there are two counter-rotating discs of stars. "The enhanced resolution that laser guide star adaptive optics provides is certain to bring important new discoveries in this exciting area," says Davies ESO PR Photo 27c/07 ESO PR Photo 27c/07 Merging System Arp 220 (SINFONI-LGS/VLT) The astronomers then turned the laser to a galaxy called K20-ID5 which is at a redshift of 2.2 - we are seeing this galaxy when the universe was less than 1/3 of its current age. The image obtained with NACO shows that the stars are concentrated in a much more compact region than the gas. "These observations are both remarkable and exciting," declares Kasper. "They are the first time that it has been possible to trace in such detail the distributions of both the stars and the gas at an epoch where we are witnessing the formation of galaxies similar to our own Milky Way." At the opposite extreme, much nearer to home, LGS-AO observations were made of the active galaxy NGC 4945. The new LGS observations with NACO resolved the central parts into a multitude of individual stars. "It is in galaxies such as these where we can really quantify the star formation history in the vicinity of the nucleus, that we can start to piece together the puzzle of how gas is accreted onto the supermassive black hole, and understand how and when these black holes light up so brightly," says Davies. ESO PR Photo 27e/07 ESO PR Ph

2007-06-01

338

49 CFR 213.63 - Track surface.  

Code of Federal Regulations, 2012 CFR

...DEPARTMENT OF TRANSPORTATION TRACK SAFETY STANDARDS Track Geometry § 213.63 Track...tangent or reverse crosslevel elevation on curves may not be more than 3 2 13/4...where the elevation at any point in a curve equals or exceeds 6 inches, the...

2012-10-01

339

Gaussian particle filtering for tracking maneuvering targets  

Microsoft Academic Search

Tracking for maneuvering targets in the presence of clutter is a challenging problem. In this paper, we present an algorithm for reliable tracking of maneuvering targets based on Gaussian particle filtering (GPF) techniques. It has been shown that sequential Monte Carlo (SMC) methods outperform the various Kalman filter based algorithms for nonlinear tracking models. The SMC, also known as particle

Tadesse Ghirmai

2007-01-01

340

Detection and frequency tracking of chirping signals  

SciTech Connect

This paper discusses several methods to detect the presence of and track the frequency of a chirping signal in broadband noise. The dynamic behavior of each of the methods is described and tracking error bounds are investigated in terms of the chirp rate. Frequency tracking and behavior in the presence of varying levels of noise are illustrated in examples. 11 refs., 29 figs.

Elliott, G.R.; Stearns, S.D.

1990-08-01

341

Track Segment Synthesis Method for NTA Film.  

National Technical Information Service (NTIS)

A method is presented for synthesizing track segments extracted from a gray-level digital picture of NTA film in automatic counting system. In order to detect each track in an arbitrary direction, even if it has some gaps, as a set of the track segments, ...

S. Kumazawa

1980-01-01

342

Orbital Evasive Target Tracking and Sensor Management.  

National Technical Information Service (NTIS)

In this chapter, we consider the sensor management problem for tracking space targets where the targets may apply evasive maneuvering strategy to avoid being tracked by the space borne observers. We first study the case of single target tracking by a sing...

D. Shen E. P. Blasch G. Chen H. Chen K. Pham

2012-01-01

343

A Multisensor Platform for Kinematic Track Surveying  

Microsoft Academic Search

The increasing use of modern high-speed trains requires increasing safety standards and, consequently, accurate railway tracks. Traditional methods for track surveying do not any longer satisfy economic aspects. For these reasons, HTA Burgdorf developed a track surveying platform in co-operation with terra vermessungen AG, Switzerland. The project is financed by KTI (Commission for Technology and Innovation by the Federal Office

Thomas Wildi; Ralph Glaus

344

Communications track for systems engineering majors  

Microsoft Academic Search

The Weapons and Systems Engineering Department at the United States Naval Academy offers an undergraduate degree in Systems Engineering (Controls) to approximately 100 midshipmen annually. Fourth year students are allowed to specialize by taking a two-course track chosen from several areas of interest. Our communications track is one of these areas. The communication track integrates signal analysis and processing methods,

Svetlana Avramov-Zamurovic; Carl Wick; Terry Dwan

1998-01-01

345

Track and Trace Case Studies Report  

Microsoft Academic Search

Report Abstract: As part of the track and trace theme of the Aero-ID programme, a series of case studies are being undertaken to establish the role of identification technologies can play in improving tracking and tracing. This report presents some initial results from two case studies focused on track and trace operations, which took place at a distribution centre for

Thomas Kelepouris; Tom Baynham; Duncan McFarlane

2006-01-01

346

SOLUTIONS FOR ACOUSTICAL PROBLEMS WITH BALLASTLESS TRACK  

Microsoft Academic Search

Ballastless track has higher sound emissions compared to ballasted track due to the reduced connecting impedance for the rail, the reduced vibration decay rates along the rail and the reduced absorption. A study using a simulation tool for the prediction of sound for trains led to a proposal for an acoustical innovative ballastless track design (AIFF). This concept introduces a

R. J. DIEHL; R. Nowack; G. Hölzl

2000-01-01

347

Complete Solution of Sun Tracking for Heliostat  

Microsoft Academic Search

A general solution of sun tracking for an arbitrarily oriented heliostat towards an arbitrarily located target on the earth is published. With the most general form of solar tracking formulae, it is seen that the used azimuth-elevation, spinning-elevation tracking formulae etc. are the special cases of it. The possibilities of utilizing the general solution and its significance in solar energy

Chen Ying-Tian; Lim Boon-Han; Lim Chern-Sing

2006-01-01

348

Tracking people with probabilistic appearance models  

Microsoft Academic Search

This paper describes a real-time computer vision system for tracking people in monocular video sequences. The system tracks people as they move through the camera's field of view, by a combination of background subtraction and the learning of appearance models. The appearance models al- low objects to be tracked through occlusions using a proba- bilistic pixel reclassification algorithm. The system

Andrew Senior; A. Hampapur; YL Tian; L. Brown; S. Pankanti; R. Bolle

2002-01-01

349

The new ATLAS track reconstruction (NEWT)  

Microsoft Academic Search

The track reconstruction of modern high energy physics experiments is a very complex task that puts stringent requirements onto the software realisation. The ATLAS track reconstruction software has been in the past dominated by a collection of individual packages, each of which incorporating a different intrinsic event data model, different data flow sequences and calibration data. Recently, the ATLAS track

T. Cornelissen; M. Elsing; I. Gavrilenko; W. Liebig; E. Moyse; A. Salzburger

2008-01-01

350

Reentry vehicle tracking in a cluttered environment  

Microsoft Academic Search

Recently, reentry vehicle (RV) tracking has become an important issue because of its high speed and high-elevation angle. The extended Kalman filter (EKF) with input estimation (IE) was developed for an RV tracking in a clear environment. However, radar tracking suffers from clutters in the form of unwanted, unavoidable and unpredictable signal echoes from sea, land and weather. The Hough

Cheng-Yu Liu; Chung-Hsing Chyuan

2010-01-01

351

Inertial tracking for mobile augmented reality  

Microsoft Academic Search

Augmented Reality applications require the tracking of moving objects in real-time. Tracking is defined as the measurement of object position and orientation in a scene coordinate system. We present a new combination of silicon micromachined accelerometers and gyroscopes which have been assembled into a six degree of freedom (6 DoF) inertial tracking system. This inertial tracker is used in combination

Peter Lang; Albert Kusej; Axel Pinz; Georg Brasseur

2002-01-01

352

RMIT University at TREC 2009: Web Track.  

National Technical Information Service (NTIS)

RMIT participated in the 2009 Web Track tasks. Our submissions utilised the Zettair search engine to index and search the Category B subset of the ClueWeb collection used by the Web Track. The Web Track was composed of two tasks, a traditional adhoc retri...

S. Garcia

2009-01-01

353

Track Picture Book. Elementary Science Study.  

ERIC Educational Resources Information Center

|This picture book was designed to be used with an Elementary Science Study unit that provides opportunities for students in grades 4-6 to study animal tracks. Shown within this book are numerous examples of tracks, including those of tires, human beings, animal tracks, and others in various media, such as snow, sand, mud, dust, and cement. (CS)|

Webster, David; And Others

354

The Variable Effects of High School Tracking.  

ERIC Educational Resources Information Center

Examines effects of tracking in high schools under different structural settings (selectivity, electivity, inclusiveness, and scope), using data for 20,762 students in 805 public and 78 Catholic high schools. Schools vary significantly in the magnitude of track effects on mathematics and verbal achievement. Catholic schools' tracking structures…

Gamoran, Adam

1992-01-01

355

Central Europe Today  

NSDL National Science Digital Library

If you are interested in reading news directly from Central Europe, then this is the publication for you. Central Europe Today is a daily English language radio news magazine syndicated throughout Central Europe.

356

US central receiver test facility (CRTF) control and data systems  

Microsoft Academic Search

The Central Receiver Test Facility (CRTF) is the primary solar test facility for the Department of Energy and is operated by Sandia National Laboratories, Albuquerque, New Mexico. The CRTF energy collection field consists of 222 heliostats (sun tracking mirror assemblies). The total heliostat field can concentrate more than 5-MWth power under optimal sun, heliostat, and target conditions. For test flexibility,

2008-01-01

357

Odor tracking flight of male Manduca sexta moths along plumes of different cross-sectional area.  

PubMed

Males of the hawkmoth, Manduca sexta, track wind-borne plumes of female sex pheromone by flying upwind, while continuously turning from side-to-side and changing altitude. Their characteristic "zigzagging" trajectory has long been thought to result from the interaction of two mechanisms, an odor-modulated orientation to wind and a built-in central nervous system turning program. An interesting and as of yet unanswered question about this tracking behavior is how the cross-section of an odor plume or its clean-air "edges" affects moths' odor tracking behavior. This study attempts to address this question by video recording and analyzing the behavior of freely flying M. sexta males tracking plumes from pheromone sources of different lengths and orientations with equal odor concentration per unit area. Our results showed that moths generated significantly wider tracks in wide plumes from the longest horizontally-oriented sources as compared to narrower point-source plumes, but had relatively unaltered tracks when orienting to plumes from the same length sources oriented vertically. This suggests that in addition to wind and the presence of pheromones, the area of the plume's cross section or its edges may also play an important role in the plume tracking mechanisms of M. sexta. PMID:24081678

Willis, Mark A; Ford, E A; Avondet, J L

2013-10-01

358

Fast Track Randomized Controlled Trial to Prevent Externalizing Psychiatric Disorders: Findings from Grades 3 to 9  

ERIC Educational Resources Information Center

|Objective: This study tests the efficacy of the Fast Track Program in preventing antisocial behavior and psychiatric disorders among groups varying in initial risk. Method: Schools within four sites (Durham, NC; Nashville, TN; Seattle, WA; and rural central Pennsylvania) were selected as high-risk institutions based on neighborhood crime and…

Journal of the American Academy of Child & Adolescent Psychiatry, 2007

2007-01-01

359

Rotation-Elevation of Sun Tracking Mode to Gain High Concentration Solar Energy  

Microsoft Academic Search

Power conversion from solar thermal energy to electrical energy is still very cost-intensive. Serious effort has to be given in the development of the concentrator or heliostat structure expenditure which contributing the most expensive component in a central receiver solar power plant. With current development to find alternatives and lower down the capital, an alternative scheme of sun tracking has

Omar Aliman; Ismail Daut

2007-01-01

360

Simplification of Sun Tracking Mode to Gain High Concentration Solar Energy  

Microsoft Academic Search

Power conversion from solar thermal energy to electrical energy is still very cost-intensive. Serious effort has to be given in the development of the concentrator or heliostat structure expenditure which contributing the most expensive component in a central receiver solar power plant. With current development to find alternatives and lower down the capital, a new mode of sun tracking has

Omar Aliman; Ismail Daut; Muzamir Isa; Mohd Rafi Adzman

361

Youth Attitude Tracking Study (YATS) In-Depth Interviews with Young Women: A Methodological Overview.  

National Technical Information Service (NTIS)

The Youth Attitude Tracking Study (YATS) began in 1975 and has grown into complex telephone survey of 16-24 year-old men and women with nationwide representation. Propensity, a central YATS measure, is the self-expressed likelihood that a youth will enlis...

S. Perry J. Lehnus

1998-01-01

362

6. 'Tunnel No. 6, Concrete Lining,' Southern Pacific Standard SingleTrack ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. 'Tunnel No. 6, Concrete Lining,' Southern Pacific Standard Single-Track Tunnel, ca. 1909. Compare to photos in documentation set for Tunnel 27 (HAER No. CA-203). - Central Pacific Transcontinental Railroad, Sacramento to Nevada state line, Sacramento, Sacramento County, CA

363

Location Tracking in a Wireless Sensor Network by Mobile Agents and Its Data Fusion Strategies  

Microsoft Academic Search

The wireless sensor network is an emerging technology that may greatly facilitate human life by providing ubiquitous sensing, computing, and communi- cation capability, through which people can more closely interact with the envi- ronment wherever he\\/she goes. To be context-aware, one of the central issues in sensor networks is location tracking, whose goal is to monitor the roaming path of

Yu-chee Tseng; Sheng-po Kuo; Hung-wei Lee; Chi-fu Huang

2003-01-01

364

Satellite tracking of threatened species  

USGS Publications Warehouse

In 1990, a joint effort of two U.S. federal agencies, NASA Goddard Space Flight Center (GSFC) and the Patuxent Wildlife Research Center, began. We initially joined forces in a project that used satellite telemetry to discover the winter home of a tiny dwindling population of Siberian Cranes. Since then several projects have emerged, and a web site was created to follow some of these activities. This web site is called the Satellite Tracking of Threatened Species and its location is http://sdcd.gsfc.nasa.gov/ISTO/satellite_tracking. It describes the overall program, and links you to three subsections that describe the projects in more detail: Satellite Direct Readout, Birdtracks, and Birdworld.

Williams, M.; Lunsford, A.; Ellis, D.; Robinson, J.; Coronado, P.; Campbell, W.

1998-01-01

365

Network exploitation using WAMI tracks  

NASA Astrophysics Data System (ADS)

Creating and exploiting network models from wide area motion imagery (WAMI) is an important task for intelligence analysis. Tracks of entities observed moving in the WAMI sensor data are extracted, then large numbers of tracks are studied over long time intervals to determine specific locations that are visited (e.g., buildings in an urban environment), what locations are related to other locations, and the function of each location. This paper describes several parts of the network detection/exploitation problem, and summarizes a solution technique for each: (a) Detecting nodes; (b) Detecting links between known nodes; (c) Node attributes to characterize a node; (d) Link attributes to characterize each link; (e) Link structure inferred from node attributes and vice versa; and (f) Decomposing a detected network into smaller networks. Experimental results are presented for each solution technique, and those are used to discuss issues for each problem part and its solution technique.

Rimey, Ray; Record, Jim; Keefe, Dan; Kennedy, Levi; Cramer, Chris

2011-05-01

366

Optimal tracking of a Brownian particle.  

PubMed

Optical tracking of a fluorescent particle in solution faces fundamental constraints due to Brownian motion, diffraction, and photon shot noise. Background photons and imperfect tracking apparatus further degrade tracking precision. Here we use a model of particle motion to combine information from multiple time-points to improve the localization precision. We derive successive approximations that enable real-time particle tracking with well controlled tradeoffs between precision and computational cost. We present the theory in the context of feedback electrokinetic trapping, though the results apply to optical tracking of any particle subject to diffusion and drift. We use numerical simulations and experimental data to validate the algorithms' performance. PMID:23037408

Fields, Alexander P; Cohen, Adam E

2012-09-24

367

Auger electrons from ion tracks  

NASA Astrophysics Data System (ADS)

The target KVV Auger electron emission has been investigated experimentally and theoretically for heavy-ion irradiation of amorphous carbon at an ion velocity of 14.1 a.u. (5 MeV/u). We extend previous investigations of multiple ionization and electronic nuclear-track temperatures to a large variety of charged projectiles, covering electrons to uranium ions. Experimental data are compared with non-pertubative calculations of multiple ionization and with results of two thermal-spike models.

Schiwietz, G.; Xiao, G.; Luderer, E.; Grande, P. L.

2000-04-01

368

Global optimization for track finding  

NASA Astrophysics Data System (ADS)

Hopfield networks with mean-field annealing have been proposed for track finding in particle detectors by Peterson and Denby. In this paper we investigate and compare some other - probabilistic and heuristic - approaches to finding the global minimum of the associated energy function: Simulated annealing, threshold accepting, great deluge, record-to-record travel, and tabu search. We also use a branch-and-bound and a branch-and-cut algorithm in order to obtain the exact global minimum.

Diehl, M.; Jünger, M.; Frühwirth, R.; Scherzer, J.

1997-02-01

369

Deer Tracks in the City?  

ERIC Educational Resources Information Center

"Why would a deer print be in the city?" wondered a student. She had noticed the track near a grocery store that morning with her mother. She was familiar with deer and had noticed their prints on a trip to a local museum; however, she had never seen a deer in the city before this experience. As she retold the story to her classmates, her question…

Quigley, Cassie Fay; Beeman-Cadwallader, Nicole; Riggs, Morgan; Rodriguez, Antonia; Buck, Gayle

2009-01-01

370

Hybrid Controller for Tracking Systems  

Microsoft Academic Search

This chapter presents a hybrid controller which can be used with tracking systems especially with laser tracker systems. The\\u000a controller consists of an analog PI controller and a microcontroller. Special features like e.g. an absolute distance measurement technique or a search algorithm\\u000a in case of beam loss is implemented. With the help of the distance measurement the controller gain is

Christian Wachten; Christoph Ament; Lars Friedrich; Claas Müller; Holger Reinecke

371

Eye tracking off the shelf  

Microsoft Academic Search

What if eye trackers could be downloaded and used immediately with standard cameras connected to a computer, without the need for an expert to setup the system? This has already the case for head trackers, so why not for eye trackers?Using components off-the-shelf (COTS) for camera-based eye tracking tasks has many advantages, but it certainly introduces several new problems as

Dan Witzner Hansen; David J. C. MacKay; John Paulin Hansen; Mads Nielsen

2004-01-01

372

Robust pointwise tracking of countours  

NASA Astrophysics Data System (ADS)

For several applications in Medicine, it is fundamental to determine the spatial tracking, along the time, of structure parts such as the apex of heart. The objective of this work is to present a robust technique for pointwise tracking of contours. Given two n-dimensional closed contours (S, D) derived from two consecutive image scenes, the basic idea is to find the cheapest path that connects each point in S to a point in D. The critical steps are the definition of the cost function and the numerical approach for the global discrete minimization. For the cost function, we have used the minimum distance to the contours and curvature of a level set function. The global discrete optimization can be achieved using dynamic programming on a constrained region with privileged tracks. A privileged path is associated to all elements that form destination contour D and a point of this contour is set as seed for the dynamic programming. By this artifice, all paths can be obtained. Simulations with several polygons showed encouraging results. For instance, for 10 prominent points and distortion of 15 degree(s) plus 20% of expansion, in a 400 x 400 pixels image, the mean distance error was below 2 pixels.

Furuie, Sergio S.; Dias, A. V.

2002-05-01

373

Tracked ultrasound for laparoscopic surgery  

NASA Astrophysics Data System (ADS)

We calibrate a tracked laparoscopic ultrasound probe for application in image-guided surgery and 3-D volume reconstruction. With a plane-mapping technique, the spatial relationship between the ultrasound beam emitted from the tip of the probe to the local coordinate system of the probe was determined by mapping it with an optically tracked pointer. A cross-wire calibration technique was also performed for comparison. The accuracy and precision of the calibrated probe was evaluated by measuring its ability to localize targets in a water bath. Target registration error depended upon probe position, varying from an average 0.88 mm for the fixed probes to 6.09 mm for a moving probe. This error can be reduced to 4.54 mm by accounting for target localization error which is the error determining the position of the probe itself. These results validate the plane-mapping calibration technique for this type of ultrasound probe, and better probe tracking is expected to reduce the overall registration error.

Bao, Philip; Warmath, John R.; Poulose, Benjamin; Galloway, Robert L., Jr.; Herline, Alan J.

2004-05-01

374

Hierarchical guidewire tracking in fluoroscopic sequences  

NASA Astrophysics Data System (ADS)

In this paper, we present a novel hierarchical framework of guidewire tracking for image-guided interventions. Our method can automatically and robustly track a guidewire in fluoroscopy sequences during interventional procedures. The method consists of three main components: learning based guidewire segment detection, robust and fast rigid tracking, and nonrigid guidewire tracking. Each component aims to handle guidewire motion at a specific level. The learning based segment detection identifies small segments of a guidewire at the level of individual frames, and provides unique primitive features for subsequent tracking. Based on identified guidewire segments, the rigid tracking method robustly tracks the guidewire across successive frames, assuming that a major motion of guidewire is rigid, mainly caused by the breathing motion and table movement. Finally, a non-rigid tracking algorithm is applied to finely deform the guidewire to provide accurate shape. The presented guidewire tracking method has been evaluated on a test set of 47 sequences with more than 1000 frames. Quantitative evaluation demonstrates that the mean tracking error on the guidewire body is less than 2 pixels. Therefore the presented guidewire tracking method has a great potential for applications in image guided interventions.

Wang, Peng; Zhu, Ying; Zhang, Wei; Chen, Terrence; Durlak, Peter; Bill, Ulrich; Comaniciu, Dorin

2009-02-01

375

Porous fission fragment tracks in fluorapatite  

SciTech Connect

Fission tracks caused by the spontaneous fission of {sup 238}U in minerals, as revealed by chemical etching, are extensively used to determine the age and thermal history of Earth's crust. Details of the structure and annealing of tracks at the atomic scale have remained elusive, as the original track is destroyed during chemical etching. By combining transmission electron microscopy with in situ heating, we demonstrate that fission tracks in fluorapatite are actually porous tubes, instead of having an amorphous core, as generally assumed. Direct observation shows thermally induced track fragmentation in fluoapatite, in clear contrast to the amorphous tracks in zircon, which gradually ''fade'' without fragmentation. Rayleigh instability and the thermal emission of vacancies control the annealing of porous fission tracks in fluorapatite.

Li Weixing; Ewing, Rodney C. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104 (United States); Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104 (United States); Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1005 (United States); Wang Lumin [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104 (United States); Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104 (United States); Sun Kai [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2104 (United States); Lang, Maik [Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1005 (United States); Trautmann, Christina [GSI Helmholtz Centre for Heavy Ion Research, Planckstr. 1, 64291 Darmstadt (Germany)

2010-10-01

376

Porous fission fragment tracks in fluorapatite  

NASA Astrophysics Data System (ADS)

Fission tracks caused by the spontaneous fission of U238 in minerals, as revealed by chemical etching, are extensively used to determine the age and thermal history of Earth’s crust. Details of the structure and annealing of tracks at the atomic scale have remained elusive, as the original track is destroyed during chemical etching. By combining transmission electron microscopy with in situ heating, we demonstrate that fission tracks in fluorapatite are actually porous tubes, instead of having an amorphous core, as generally assumed. Direct observation shows thermally induced track fragmentation in fluoapatite, in clear contrast to the amorphous tracks in zircon, which gradually “fade” without fragmentation. Rayleigh instability and the thermal emission of vacancies control the annealing of porous fission tracks in fluorapatite.

Li, Weixing; Wang, Lumin; Sun, Kai; Lang, Maik; Trautmann, Christina; Ewing, Rodney C.

2010-10-01

377

Implementation and experimental results of 4D tumor tracking using robotic couch  

PubMed Central

Purpose: This study presents the implementation and experimental results of a novel technique for 4D tumor tracking using a commercially available and commonly used treatment couch and evaluates the tumor tracking accuracy in clinical settings. Methods: Commercially available couch is capable of positioning the patient accurately; however, currently there is no provision for compensating physiological movement using the treatment couch in real-time. In this paper, a real-time couch tracking control technique is presented together with experimental results in tumor motion compensation in four dimensions (superior-inferior, lateral, anterior-posterior, and time). To implement real-time couch motion for tracking, a novel control system for the treatment couch was developed. The primary functional requirements for this novel technique were: (a) the treatment couch should maintain all previous/normal features for patient setup and positioning, (b) the new control system should be used as a parallel system when tumor tracking would be deployed, and (c) tracking could be performed in a single direction and/or concurrently in all three directions of the couch motion (longitudinal, lateral, and vertical). To the authors’ best knowledge, the implementation of such technique to a regular treatment couch for tumor tracking has not been reported so far. To evaluate the performance of the tracking couch, we investigated the mechanical characteristics of the system such as system positioning resolution, repeatability, accuracy, and tracking performance. Performance of the tracking system was evaluated using dosimetric test as an endpoint. To investigate the accuracy of real-time tracking in the clinical setting, the existing clinical treatment couch was replaced with our experimental couch and the linear accelerator was used to deliver 3D conformal radiation therapy (3D-CRT) and intensity modulated radiation therapy (IMRT) treatment plans with and without tracking. The results of radiation dose distribution from these two sets of experiments were compared and presented here. Results: The mechanical accuracies were 0.12, 0.14, and 0.18 mm in X, Y, and Z directions. The repeatability of the desired motion was within ±0.2 mm. The differences of central axis dose between the 3D-CRT stationary plan and two tracking plans with different motion trajectories were 0.21% and 1.19%. The absolute dose differences of both 3D tracking plans comparing to the stationary plan were 1.09% and 1.20%. Comparing the stationary IMRT plan with the tracking IMRT plan, it was observed that the central axis dose difference was ?0.87% and the absolute difference of both IMRT plans was 0.55%. Conclusions: The experimental results revealed that the treatment couch could be successfully used for real-time tumor tracking with a high level of accuracy. It was demonstrated that 4D tumor tracking was feasible using existing couch with implementation of appropriate tracking methodology and with modifications in the control system.

Buzurovic, I.; Yu, Y.; Werner-Wasik, M.; Biswas, T.; Anne, P. R.; Dicker, A. P.; Podder, T. K.

2012-01-01

378

CENTRAL PLACE FORAGING AND PREY PREPARATION BY A SPECIALIST PREDATOR, THE MERLIN  

Microsoft Academic Search

By discarding inedible body parts of prey at greater distances from a central place, a central place forager can reduce the cost of prey transport and thus increase net rate of energy delivery. This hypothesis was tested in a specialist predator, the Merlin (Falco columbarius). Fifteen male Merlins were radio-tracked in Saskatoon (Canada) for this study. Merlins were more likely

NAY JOT S. SODHI; FALCO COLUMBARIUS

379

New technologies in the D0 central tracker upgrade  

SciTech Connect

The D0 collaboration has undertaken an aggressive upgrade of its central tracking system. The existing tracker will be completely removed and replaced by a two Tesla superconducting solenoidal magnet, an 837 000 channel silicon vertex system, and 80 000 channel scintillating fiber tracker, followed by a 7 680 channel central preshower detector and a 16 000 channel forward preshower detector. In this paper the author discusses all of the subsystems of the D0 central tracker upgrade, but will emphasize those aspects which involve new technology: radiation hard scintillating fiber, VLPC`s and extruded scintillating strips.

Lincoln, D. [Univ. of Michigan, Ann Arbor, MI (United States); D0 Collaboration

1996-06-01

380

Tracking \\  

Microsoft Academic Search

Policy makers are calling for new socio-economic measures that reflect subjective well-being, to complement traditional measures of material welfare as the Gross Domestic Product (GDP). Self-reporting has been found to be reasonably accurate in measuring one's well-being and conveniently tallies with sentiment expressed on social media (e.g., those satisfied with life use more positive than negative words in their Facebook

Daniele Quercia; Jonathan Ellis; Licia Capra; Jon Crowcroft

2012-01-01

381

Moving target tracking using multiple sensors  

NASA Astrophysics Data System (ADS)

Multiple Sensors improve tracking performance. The Kinematic Automatic Tracker (KAT) may drop a track when the Joint STARS aircraft is turning or the track is screened. In situation like this multiple sensors can improve tracking performance. Two algorithms for tracking moving targets using multiple sensors are developed. Both algorithms are based on modifying the existing KAT architecture. The first approach is based on the use of the best sensor's Moving Target Indicators (MTIs) when the sensors have overlapping dwells. The second and more general approach uses the report-to-track fusion algorithm. The first approach is frame- based (with multiple dwells), whereas the second approach is dwell- based. The tracking results are presented for the first algorithm for a two-sensors Korean scenario with increasing complexity. We also show the advantages of using multiple sensors for tracking using a simulated Korea scenario. For the report-to-track fusion algorithm, we present preliminary tracking results for a simulated scenario using two UAV sensors.

Lodaya, Manikant D.; Bottone, Richard

2000-07-01

382

Computer modeling of tank track elastomers  

SciTech Connect

Computer models of the T142, T156 and the British Chieftain tank tracks have been studied as part of a program to examine the tank-track-pad failure problem. The modeling is based on the finite element method with two different models being used to evaluate the thermal and mechanical response of the tracks. Modeling has enabled us to evaluate the influence of track design, elastomer formulation and operating scenario on the response of the track. the results of these analyses have been evaluated with experimental tests that quantify the extent of damage development in elastomers and thus indicate the likelihood of pad failure due to ''cutting and chunking.'' The primary characteristics influencing the temperatures achieved in the track are the heat-generation rate and the track geometry. The heat-generation rate is related to the viscoelastic material properties of the elastomer, track design and loading/operating scenario. For all designs and materials studied, stresses produced during contact with a flat roadway surface were not considered large enough to damage the pad. Operating scenarios were studied in which the track pad contacts rigid bars representing idealized obstacles in cross country terrain. A highly localized obstacle showed the possibility for subsurface mechanical damage to the track pad due to obstacle contact. Contact with a flat rigid bar produced higher tensile stresses that were near the damage thresholds for this material and thus capable of producing cutting and chunking failures.

Lesuer, D.R.; Goldberg, A.; Patt, J.

1985-01-01

383

Visual tracking for mobile robot pursuit  

NASA Astrophysics Data System (ADS)

This research is part of a broader effort to develop a supervisory control system for small robot navigation. Previous research and development focused on a "one-touch, point-and-go" navigation control system using visual homing. In the current research, we have begun to investigate visual tracking methods to extend supervisory control to tasks involving tracking and pursuit of a moving object. Ground-to-ground tracking of arbitrary targets in natural and damaged environments is challenging. Automatic tracking is expected to fail due to line-of-sight obstruction, lighting gradients, rapid changes in perspective and orientation, etc. In supervisory control, the automatic tracker needs able to alert the operator when it is at risk of losing track or when it may have already lost track, and do so with a low false alarm rate. The focus of the current research is on detecting tracking failure during pursuit. We are attempting to develop approaches to detecting failure that can integrate different low-level tracking algorithms. In this paper, we demonstrate stereo vision methods for pursuit tracking and examine several indicators of track loss in field experiments with a variety of moving targets in natural environment.

Witus, Gary; Karlsen, Robert; Overholt, James; Gerhart, Grant

2005-10-01

384

Temporal/spatial tracking requirements for tracking humans  

NASA Astrophysics Data System (ADS)

This paper details the development, experimentation, collected data and the results of research designed to gain an understanding of the temporal and spatial image collection guidelines for tracking humans. More specifically, a quantitative understanding of the relationship between human observer performance and the spatial and temporal resolution is sought. Performance is measured as a function of the number of video frames per second, imager spatial resolution and the ability of the observer to accurately determine the destination of a moving human target. The research is restricted to data and imagery collected from altitudes typical of modern low to mid altitude persistent surveillance platforms using a wide field of view. The ability of the human observer to perform an unaided track of a human target was determined by their completion of carefully designed perception experiments. In these experiments, the observers were presented with simulated imagery from Night Vision's EOSim urban terrain simulator. The details of the simulated targets and backgrounds, the design of the experiments and their associated results are included in this treatment.

Robinson, Aaron L.; Miller, Brian; Moyer, Steve; Ra, Chun

2007-05-01

385

Tracking system for solar collectors  

DOEpatents

A tracking system is provided for pivotally mounted spaced-apart solar collectors. A pair of cables is connected to spaced-apart portions of each collector, and a driver displaces the cables, thereby causing the collectors to pivot about their mounting, so as to assume the desired orientation. The collectors may be of the cylindrical type as well as the flat-plate type. Rigid spar-like linkages may be substituted for the cables. Releasable attachments of the cables to the collectors is also described, as is a fine tuning mechanism for precisely aligning each individual collector.

Butler, B.

1980-10-01

386

Tracking the Homunculus and Outer Ejecta of Eta Carinae  

NASA Astrophysics Data System (ADS)

We request WFPC2 images of Eta Carinae in order to complete our WFPC2 database to track the expansion of high-velocity material ejected during one or more giant outbursts of the central supermassive star. These images will increase the time baseline to 8 years of high-resolution Planetary Camera data for measuring proper motions and monitoring photometric changes in the debris field. Assuming a distance to Eta of 2300 pc, we will be able to trace transverse motions of the debris to better than 15 km/s precision and should be able to discern deviations from linear motions that are predicted in some models for the Giant Eruption. PC1 images in red and blue continuum filters will be used to track the expansion of the dusty bipolar lobes of Eta's ''Homunculus'' and equatorial skirt of ejecta. WF3 emission-line images will be used to trace motions of the outer debris field 10'' - 40'' from the central star. We can uniquely address issues of hydrodynamic expansion and wind-wind interactions through a time series of exposures of this textbook bipolar system. Because many groups around the world who are working on different facets of Eta Carinae will be interested in these images, we waive the proprietary rights to the dataset in order to maximize its usage. The science goals and exposures requested here are NOT covered in the Cycle 11 Treasury program to monitor the Eta Carinae ''event'' in May 2003.

Morse, Jon

2003-07-01

387

Tracking multiple targets with multifocal attention.  

PubMed

Attention allows us to monitor objects or regions of visual space and select information from them for report or storage. Classical theories of attention assumed a single focus of selection but many everyday activities, such as video games, navigating busy intersections, or watching over children at a swimming pool, require attention to multiple regions of interest. Laboratory tracking tasks have indeed demonstrated the ability to track four or more targets simultaneously. Although the mechanisms by which attention maintains contact with several targets are not yet established, recent studies have identified several characteristics of the tracking process, including properties defining a 'trackable' target, the maximum number of targets that can be tracked, and the hemifield independence of the tracking process. This research also has implications for computer vision, where there is a growing demand for multiple-object tracking. PMID:15953754

Cavanagh, Patrick; Alvarez, George A

2005-07-01

388

Efficient Object Tracking in WAAS Data Streams  

NASA Astrophysics Data System (ADS)

Wide area airborne surveillance (WAAS) systems are a new class of remote sensing imagers which have many military and civilian applications. These systems are characterized by long loiter times (extended imaging time over fixed target areas) and large footprint target areas. These characteristics complicate moving object detection and tracking due to the large image size and high number of moving objects. This thesis evaluates existing object detection and tracking algorithms with WAAS data and provides enhancements to the processing chain which decrease processing time and increase tracking accuracy. Decreases in processing time are needed to perform real-time or near real-time tracking either on the WAAS sensor platform or in ground station processing centers. Increased tracking accuracy benefits real-time users and forensic (off-line) users. The original contribution of this thesis increases tracking efficiency and accuracy by breaking a WAAS scene into hierarchical areas of interest (AOIs) and through the use of hyperspectral cueing.

Clarke, Trevor R. H.

389

Design of a photovoltaic central power station  

SciTech Connect

Photovoltaic central power station designs have been developed for both high-efficiency flat-panel arrays and two-axis tracking concentrator arrays. Both designs are based on a site adjacent to the Saguaro Power Station of Arizona Public Service. The plants are 100 MW each, made of 5 MW subfields. The site specific designs allow detailed cost estimate for site preparation, installation, and engineering. These designs are summarized and cost estimates analyzed. Provided also are recommendations for future work to reduce system cost for each plant design.

Not Available

1984-02-01

390

High resolution 3D insider detection and tracking.  

SciTech Connect

Vulnerability analysis studies show that one of the worst threats against a facility is that of an active insider during an emergency evacuation. When a criticality or other emergency alarm occurs, employees immediately proceed along evacuation routes to designated areas. Procedures are then implemented to account for all material, classified parts, etc. The 3-Dimensional Video Motion Detection (3DVMD) technology could be used to detect and track possible insider activities during alarm situations, as just described, as well as during normal operating conditions. The 3DVMD technology uses multiple cameras to create 3-dimensional detection volumes or zones. Movement throughout detection zones is tracked and high-level information, such as the number of people and their direction of motion, is extracted. In the described alarm scenario, deviances of evacuation procedures taken by an individual could be immediately detected and relayed to a central alarm station. The insider could be tracked and any protected items removed from the area could be flagged. The 3DVMD technology could also be used to monitor such items as machines that are used to build classified parts. During an alarm, detections could be made if items were removed from the machine. Overall, the use of 3DVMD technology during emergency evacuations would help to prevent the loss of classified items and would speed recovery from emergency situations. Further security could also be added by analyzing tracked behavior (motion) as it corresponds to predicted behavior, e.g., behavior corresponding with the execution of required procedures. This information would be valuable for detecting a possible insider not only during emergency situations, but also during times of normal operation.

Nelson, Cynthia Lee

2003-09-01

391

Temporal volume flow: an approach to tracking failure recovery  

NASA Astrophysics Data System (ADS)

The simultaneous use of pre-segmented CT colonoscopy images and optical colonoscopy images during routine endoscopic procedures provides useful clinical information to the gastroenterologist. Blurry images in the video stream can cause the tracking system to fail during the procedure, due to the endoscope touching the colon wall or a polyp. The ability to recover from such failures is necessary to continually track images, and goes towards building a robust tracking system. Identifying similar images before and after the blurry sequence is central to this task. In this work, we propose a Temporal Volume Flow(TVF) based approach to search for a similar image pair before and after blurry sequences in the optical colonoscopy video. TVF employs nonlinear intensity and gradient constancy models, as well as a discontinuity-preserving smoothness constraint to formulate an energy function; minimizing this function between two temporal volumes before and after the blurry sequence results in an estimate of TVF. A voting approach is then used to determine an image pair with the maximum number of point correspondences. Region flow algorithm10 is applied to the selected image pair to determine camera motion parameters. We applied our algorithm to three optical colonoscopy sequences. The first sequence had 235 images in the ascending colon, and 12 blurry images. The image pair selected by TVF decreases the rotation error of the tracking results using the region flow algorithm. Similar results were observed in the second patient in the descending colon, containing 535 images and 24 blurry images. The third sequence contained 580 images in the descending colon and 172 blurry images. Region flow method failed in this case due to improper image pair selection; using TVF to determine the image pair allowed the system to successfully recover from the blurry sequence.

Liu, Jianfei; Subramanian, Kalpathi R.; Yoo, Terry S.

2011-03-01

392

The first pterosaur tracks from Gondwana  

Microsoft Academic Search

Pterosaur tracks from the Candeleros Member of the Rio Limay Formation (Albian–Cenomanian) at Lake Ezequiel Ramos Mex??a, Neuquén Province, Argentina, are the first pterosaurian tracks reported from South America and from the Southern Hemisphere. Although the individual footprints are not well preserved, some trackway segments and manus-pes sets are preserved, suggesting that the tracks can be assigned to cf. Pteraichnus

Jorge O. Calvo; Martin G. Lockley

2001-01-01

393

Building the RHIC tracking lattice model  

SciTech Connect

In this note we outline the procedure to build a realistic lattice model for the RHIC beam-beam tracking simulation. We will install multipole field errors in the arc main dipoles, arc main quadrupols and interaction region magnets (DX, D0, and triplets) and introduce a residual closed orbit, tune ripples, and physical apertures in the tracking lattice model. Nonlinearities such as local IR multipoles, second order chromaticies and third order resonance driving terms are also corrected before tracking.

Luo, Y.; Fischer, W.; Tepikian, S.

2010-01-27

394

Fast track finding with neural networks  

NASA Astrophysics Data System (ADS)

We have used a neural network (NN) technique for track reconstruction in a realistic environment. An algorithm based on an Hopfield-style recurrent NN was developed and tested on the track coordinates measured by the TPC of the ALEPH detector at LEP. The efficiency and time consumption are given and are compared with a conventional pattern-recognition method. The performance of the algorithm for large numbers of tracks (up to 200), as expected for LHC and SSC detectors, is discussed.

Stimpfl-Abele, Georg; Garrido, Lluís

1991-04-01

395

Tracking of Constrained Submarine Robot Arms  

Microsoft Academic Search

Despite the appearance of impressive submarine robot arms (SRA), simple posture (position\\/orientation) regulators are implemented\\u000a nowadays and tracking still remains an open issue, let alone the force\\/posture tracking goal. The main challenge to achieve\\u000a simultaneous tracking of posture and force seems the complex dynamical structure, the difficulty to measure precisely the\\u000a inertial parameters of SRA and the access to the

Ernesto Olguín-Díaz; Vicente Parra-Vega

396

Efficient, causal camera tracking in unprepared environments  

Microsoft Academic Search

This paper addresses the problem of tracking the 3D pose of a camera in space, using the images it acquires while moving freely in unmodeled, arbitrary environments. A novel feature-based approach for camera tracking is proposed, intended to facilitate tracking in on-line, time-critical applications such as video see-through augmented reality. In contrast to several existing methods which are designed to

Manolis I. A. Lourakis; Antonis A. Argyros

2005-01-01

397

Complete Solution of Sun Tracking for Heliostat  

NASA Astrophysics Data System (ADS)

A general solution of sun tracking for an arbitrarily oriented heliostat towards an arbitrarily located target on the earth is published. With the most general form of solar tracking formulae, it is seen that the used azimuth-elevation, spinning-elevation tracking formulae etc. are the special cases of it. The possibilities of utilizing the general solution and its significance in solar energy engineering are discussed.

Chen, Ying-Tian; Lim, Boon-Han; Lim, Chern-Sing

2006-01-01

398

Computer modeling of tank track elastomers  

Microsoft Academic Search

Computer models of the T142, T156 and the British Chieftain tank tracks have been studied as part of a program to examine the tank-track-pad failure problem. The modeling is based on the finite element method with two different models being used to evaluate the thermal and mechanical response of the tracks. Modeling has enabled us to evaluate the influence of

D. R. Lesuer; A. Goldberg; J. Patt

1985-01-01

399

Track performance considerations for monopulse radars  

Microsoft Academic Search

A generic monopulse radar simulation model is being developed to assess the effectiveness of counter-measures and counter-countermeasures in selectable tactical scenarios. In this report, track performance consideration for monopulse radars is analyzed in detail. The radar tracking stability and sensitivity are analyzed in terms of the open-loop gain crossover, open-loop phase margin, and the closed-loop bandwidth and damping ration. Track

Ching-Tai Lin; Dean D. Howard

1988-01-01

400

Metaheuristics for the Index Tracking Problem  

Microsoft Academic Search

Passive portfolio management strategies such as Index Tracking have gained considerable attention the industry recently which\\u000a has also sparked some research interest. Index Tracking Problems are often complex in nature because of constraints on the\\u000a portfolio structure and the chosen measure for the Tracking Error, quickly defying the use of traditional deterministic methods.\\u000a Heuristic search and optimizationmethods, on the other

Giacomo di Tollo; Dietmar Maringer

401

Tracking adaptive optics scanning laser ophthalmoscope  

NASA Astrophysics Data System (ADS)

Active image stabilization for an adaptive optics scanning laser ophthalmoscope (AOSLO) was developed and tested in human subjects. The tracking device, a high speed, closed-loop optical servo which uses retinal features as tracking target, is separate from AOSLO optical path. The tracking system and AOSLO beams are combined via a dichroic beam splitter in front of the eye. The primary tracking system galvanometer mirrors follow the motion of the eye. The AOSLO raster is stabilized by a secondary set of galvanometer mirrors in the AOSLO optical train which are "slaved" to the primary mirrors with fixed scaling factors to match the angular gains of the optical systems. The AO system (at 830 nm) uses a MEMS-based deformable mirror (Boston Micromachines Inc.) for wave-front correction. The third generation retinal tracking system achieves a bandwidth of greater than 1 kHz allowing acquisition of stabilized AO images with an accuracy of <10 ?m. However, such high tracking bandwidth, required for tracking saccades, results in finite tracking position noise which is evident in AOSLO images. By means of filtering algorithms, the AOSLO raster is made to follow the eye accurately with reduced tracking noise artifacts. The system design includes simultaneous presentation of non-AO, wide-field (~40 deg) live reference image captured with a line scanning laser ophthalmoscope (LSLO) typically operating from 900 to 940nm. High-magnification (1-2 deg) AOSLO retinal scans easily positioned on the retina in a drag-and-drop manner. Normal adult human volunteers were tested to optimize the tracking instrumentation and to characterize AOSLO imaging performance. Automatic blink detection and tracking re-lock, enabling reacquisition without operator intervention, were also tested. The tracking-enhanced AOSLO may become a useful tool for eye research and for early detection and treatment of retinal diseases.

Ferguson, R. Daniel; Hammer, Daniel X.; Bigelow, Chad E.; Iftimia, Nicusor V.; Ustun, Teoman E.; Burns, Stephen A.; Elsner, Ann E.; Williams, David R.

2006-03-01

402

Microtubule Tip Tracking and Tip Structures at the Nanometer Scale Using Digital Fluorescence Microscopy  

PubMed Central

Microtubules (MTs) are central to fundamental cellular processes including mitosis, polarization, and axon extension. A key issue is to understand how MT-associated proteins and therapeutic drugs, such as the anticancer drug paclitaxel, control MT self-assembly. To facilitate this research, it would be helpful to have automated methods that track the tip of dynamically assembling MTs as observed via fluorescence microscopy. Through a combination of digital fluorescence imaging with MT modeling, model-convolution, and automated image analysis of live and fixed MTs, we developed a method for MT tip tracking that includes estimation of the measurement error. We found that the typical single-frame tip tracking accuracy of GFP-tubulin labeled MTs in living LLC-PK1? cells imaged with a standard widefield epifluorescence digital microscope system is ~36 nm, the equivalent of ~4.5 tubulin dimer layers. However, if the MT tips are blunt, the tip tracking accuracy can be as accurate as ~15 nm (~2 dimer layers). By fitting a Gaussian survival function to the MT tip intensity profiles, we also established that MTs within living cells are not all blunt, but instead exhibit highly variable tapered tip structures with a protofilament length standard deviation of ~180 nm. More generally, the tip tracking method can be extended to track the tips of any individual fluorescently labeled filament, and can estimate filament tip structures both in vivo and in vitro with single-frame accuracy on the nanoscale.

Demchouk, Alexei O.; Gardner, Melissa K.; Odde, David J.

2012-01-01

403

Air tract in the thrombus: paradoxical cerebral air embolism through a residual catheter track.  

PubMed

We report a 49-year-old woman who sustained ischemic stroke after central venous catheter removal. Brain computed tomography (CT) scan revealed air bubbles in the subarachnoid vessels. Contrast-enhanced chest CT and ultrasonography revealed a residual catheter track in the center of a jugular vein thrombus. A right-to-left shunt was confirmed by transthoracic echocardiography and transcranial Doppler with bubble contrast. The patient was ultimately diagnosed with a paradoxical cerebral air embolism through the residual catheter track in the thrombus. Rapid recognition, response, and prompt diagnosis are the most important factors in the successful treatment of such an embolism. PMID:21820322

Oyama, Naoki; Sakaguchi, Manabu; Kitagawa, Kazuo

2011-08-04

404

Solutions for Acoustical Problems with Ballastless Track  

NASA Astrophysics Data System (ADS)

Ballastless track has higher sound emissions compared to ballasted track due to the reduced connecting impedance for the rail, the reduced vibration decay rates along the rail and the reduced absorption. A study using a simulation tool for the prediction of sound for trains led to a proposal for an acoustical innovative ballastless track design (AIFF). This concept introduces a damped and booted sleeper. A prototype sleeper has been developed. Results from laboratory experiments on a single sleeper and on a short-track section consisting of 10 sleepers showed promising results.

Diehl, R. J.; Nowack, R.; Hölzl, G.

2000-03-01

405

Federated filter for multiplatform track fusion  

NASA Astrophysics Data System (ADS)

The federated filter is a near globally optimal distributed estimation method based on rigorous information-sharing principles. It is applied here to multi-perform target tracking systems where platform-level target tracks are fused across platforms into global tracks. Global track accuracy is enhanced by the geometric diversity of measurements from different platforms, in addition to the greater number of measurements. On each platform, the federated filter employs dual platform-level filters (PFs) for each track. The primary PFs are locally optimal, and contain all the information gathered from the platform track sensors. The secondary PFs are identical except that they contain only the incremental track information gained since the last fusion cycle. On each platform, global track solutions are near globally optimal because they receive only new tracklet information from the onboard and off-board PFs, and don to re-use old platform-level information. Logistically, platforms can operate autonomously with no need for synchronized operations or master/slave designations; the architecture is completely symmetric. Platforms can enter or leave the group with no changes in other global trackers. Communications bandwidth is minimal because global tracks need not be shared. The paper describes the theoretical basis of the federated fusing filter, the related data association functions, and preliminary simulation results.

Carlson, Neal A.

1999-10-01

406

Launch vehicle tracking enhancement through Global Positioning System Metric Tracking  

NASA Astrophysics Data System (ADS)

United Launch Alliance (ULA) initiated operational flights of both the Atlas V and Delta IV launch vehicle families in 2002. The Atlas V and Delta IV launch vehicles were developed jointly with the US Air Force (USAF) as part of the Evolved Expendable Launch Vehicle (EELV) program. Both Launch Vehicle (LV) families have provided 100% mission success since their respective inaugural launches and demonstrated launch capability from both Vandenberg Air Force Base (VAFB) on the Western Test Range and Cape Canaveral Air Force Station (CCAFS) on the Eastern Test Range. However, the current EELV fleet communications, tracking, & control architecture & technology, which date back to the origins of the space launch business, require support by a large and high cost ground footprint. The USAF has embarked on an initiative known as Future Flight Safety System (FFSS) that will significantly reduce Test Range Operations and Maintenance (O& M) cost by closing facilities and decommissioning ground assets. In support of the FFSS, a Global Positioning System Metric Tracking (GPS MT) System based on the Global Positioning System (GPS) satellite constellation has been developed for EELV which will allow both Ranges to divest some of their radar assets. The Air Force, ULA and Space Vector have flown the first 2 Atlas Certification vehicles demonstrating the successful operation of the GPS MT System. The first Atlas V certification flight was completed in February 2012 from CCAFS, the second Atlas V certification flight from VAFB was completed in September 2012 and the third certification flight on a Delta IV was completed October 2012 from CCAFS. The GPS MT System will provide precise LV position, velocity and timing information that can replace ground radar tracking resource functionality. The GPS MT system will provide an independent position/velocity S-Band telemetry downlink to support the current man-in-the-loop ground-based commanded destruct of an anomalous flight- The system utilizes a 50 channel digital receiver capable of navigating in high dynamic environments and high altitudes fed by antennas mounted diametrically opposed on the second stage airframe skin. To enhance cost effectiveness, the GPS MT System design implemented existing commercial parts and common environmental and interface requirements for both EELVs. The EELV GPS MT System design is complete, successfully qualified and has demonstrated that the system performs as simulated. This paper summarizes the current development status, system cost comparison, and performance capabilities of the EELV GPS MT System.

Moore, T. C.; Li, Hanchu; Gray, T.; Doran, A.

407

49 CFR 218.27 - Workers on track other than main track.  

Code of Federal Regulations, 2011 CFR

...displayed at or near each manually operated switch providing access to that track; (b) Each manually operated switch providing access to the track on which...the operator of any remotely controlled switch that work is to be performed and...

2011-10-01

408

49 CFR 218.27 - Workers on track other than main track.  

Code of Federal Regulations, 2012 CFR

...displayed at or near each manually operated switch providing access to that track; (b) Each manually operated switch providing access to the track on which...the operator of any remotely controlled switch that work is to be performed and...

2012-10-01

409

Development of a high-speed, half-tracked truck with metal-coreless rubber track  

Microsoft Academic Search

A high speed half-tracked truck using a new type of metal-coreless rubber track for traveling and load-carrying both on- and off-road was developed. In this application a conventional embedded-metal rubber track was examined in a first step, and was found to be unsuitable because of its chain-type structure. Then a new type of positive drive metal-coreless rubber track with endless

E. Teramoto; F. Yabe; K. Fukushima; H. Narahara; Y. Kiyono; S. Togasi; M. Kadono; N. Nishimura; T. Muramatsu

1996-01-01

410

Tracking formulas and strategies for a receiver oriented dual-axis tracking toroidal heliostat  

Microsoft Academic Search

A 4m×4m toroidal heliostat with receiver oriented dual-axis tracking, also called spinning-elevation tracking, was developed as an auxiliary heat source for a hydrogen production system. A series of spinning-elevation tracking formulas have been derived for this heliostat. This included basic tracking formulas, a formula for the elevation angle for heliostat with a mirror-pivot offset, and a more general formula for

Minghuan Guo; Zhifeng Wang; Wenfeng Liang; Xiliang Zhang; Chuncheng Zang; Zhenwu Lu; Xiudong Wei

2010-01-01

411

Superior augmented reality registration by integrating landmark tracking and magnetic tracking  

Microsoft Academic Search

Accurate registration between real and virtual objects is crucial for augmented reality applications. Existing tracking methods are individually inadequate: magnetic trackers are inaccurate, mechanical trackers are cumbersome, and vision-based trackers are computationally problematic. We present a hybrid tracking method that combines the accuracy of vision-based tracking with the robustness of magnetic tracking without compromising real-time performance or usability. We demonstrate

Andrei State; Gentaro Hirota; David T. Chen; William F. Garrett; Mark A. Livingston

1996-01-01

412

People Tracking with UWB Radar Using a Multiple-Hypothesis Tracking of Clusters (MHTC) Method  

Microsoft Academic Search

This paper presents a method to track multiple moving humans using Ultra-Wideband (UWB) radar. UWB radar can complement other\\u000a human tracking technologies, as it works well in poor visibility conditions. Our tracking approach is based on a point process\\u000a interpretation of the multi-path UWB radar scattering model for moving humans. Based on this model, we present a multiple\\u000a hypothesis tracking

SangHyun Chang; Rangoli Sharan; Michael T. Wolf; Naoki Mitsumoto; Joel W. Burdick

2010-01-01

413

Central pontine myelinolysis  

MedlinePLUS

Central pontine myelinolysis is brain cell dysfunction caused by the destruction of the layer ( myelin sheath ) covering ... nerve to another. The most common cause of central pontine myelinolysis is a quick rise in the ...

414

Central line infections - hospitals  

MedlinePLUS

... and increase how long you are in the hospital. Your central line needs special care to prevent ... The hospital staff will use aseptic technique when a central line is put in your chest or arm. Aseptic ...

415

Central Tendency and Variability  

NSDL National Science Digital Library

This chapter presents two important interrelated topics in statistics: central tendency and variability. Measures of central tendency show how similar the data points in a set of data are, while measures of variability show how much the

Christmann, Edwin P.; Badgett, John L.

2008-11-01

416

Central Avalanche Hazard Forecasting.  

National Technical Information Service (NTIS)

This report summarizes the first year of activity under Washington State Department of Highways project Central Avalanche Hazard Forecasting (Agreement Y-1700) to test the feasibility and effectiveness of central avalanche forecasting for the Cascade Moun...

E. R. LaChapelle R. T. Marriott M. B. Moore F. W. Reanier P. L. Taylor

1976-01-01

417

Joint sensor registration and track-to-track fusion for distributed trackers  

Microsoft Academic Search

Sensor registration deals with the correction of registration errors and is an inherent problem in all multisensor tracking systems. Traditionally, it is viewed as a least squares or a maximum likelihood problem independent of the fusion problem. We formulate it as a Bayesian estimation problem where sensor registration and track-to-track fusion are treated as joint problems and provide solutions in

NICKENS N. OKELLO; SUBHASH CHALLA

2004-01-01

418

Association of over-the-horizon radar tracks with tracks from microwave radar and other sources  

NASA Astrophysics Data System (ADS)

The Jindalee Operational Radar Network (JORN) consists of a network of overlapping skywave over-the-horizon radars (OTHR) which will provide surveillance of the air space and ocean off the northern coast of Australia. An OTHR can yield multiple tracks from a single target as a result of the complex structure of the ionosphere which varies spatially and temporally. Overlapping OTHRs, microwave radars and other sensors can simultaneously form tracks on the same targets. Consequently there is a heavy burden on operators to associate and combine those tracks which are derived from the same target. The broad objective of this work is to perform the fusion of OTHR tracks with tracks from other sources such as microwave radars and targets reporting Global Positioning System (GPS) data. An efficient algorithm has been developed which can incorporate advice about the propagation paths through the ionosphere and produce a list of associations of OTHR tracks and non-OTHR tracks. This algorithm is a generalization of a previously developed algorithm for associating tracks from multiple OTHRs. It can operate in real-time and allows for the possibility of refining the ionospheric advice system based on ground registered tracks. A brief description of the association algorithm is reported with discussions on the method of determining the closeness of tracks, the management of uncertainty in the track state, and the selection of associated tracks.

White, Kruger A.; dall, Ian W.; Shellshear, Andrew J.

1996-06-01

419

Factors Associated With Tracking of BMI: A Meta-Regression Analysis on BMI Tracking  

Microsoft Academic Search

Stable tracking of body composition is a prerequisite for the long-term effect of preventive measures against obesity and its harmful effects. As BMI tracking estimates reported by individual studies vary considerably, we performed a meta-regression analysis to provide a summary estimate and to assess determinants of BMI tracking. Using the Medline and EMBASE databases, a systematic review was conducted to

Otmar Bayer; Helia Krüger; Rüdiger von Kries; André M. Toschke

2011-01-01

420

The Six Track Scherzer Rolling Lift Bridge?Two double track spans ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

The Six Track Scherzer Rolling Lift Bridge?Two double track spans closed. One double-track span open. Photocopy of plate xvi in Scherzer Rolling Lift Bridge Company, Scherzer Rolling Lift Bridges. - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

421

Study on Dynamic Response of Coupled Model between Vehicle and Track for LIM Track Transportation  

Microsoft Academic Search

LIM track transportation lowers the construction price, increases stability as well as improves curve passing. It belongs to green transportation. So it's greatly demanded to satisfying the medium carrying capacity in cities. But the related research hasn't yet done in China. The paper introduces the characteristics of LIM track transportation, setups coupled dynamic model between vehicle and track combining the

Wan Chuan-feng; Wei Qing-chao; Zhao Jin-shun

2006-01-01

422

Denuclearizing central Asia  

Microsoft Academic Search

This study deals with two interrelated issues: the withdrawal of Soviet nuclear weapons from Central Asia; and the regional nuclear?weapon?free zone (NWFZ) initiative. Central Asian countries succeeded in denuclearizing the region. The ex?Soviet nuclear weapons were withdrawn from Central Asia, and fissile material production for military purposes was stopped. The Central Asian states acceded to the Non?Proliferation Treaty (NPT) and

Alexander Sergounin

1999-01-01

423

Martian Central Pit Craters.  

National Technical Information Service (NTIS)

Impact craters containing central pits are rare on the terrestrial planets but common on icy bodies. Mars is the exception among the terrestrial planets, where central pits are seen on crater floors ('floor pits') as well as on top of central peaks ('summ...

E. Hillman N. G. Barlow

2005-01-01

424

European Central Bank  

NSDL National Science Digital Library

Together with the national central banks of the European Union, the European Central Bank (ECB) collects statistical information and governs the European System of Central Banks (ESCB). Legal texts about the ECB, the ESCB, and the European Monetary Union (EMI) are provided in addition to press releases, speeches, euro area statistics and selected publications of the EMI (in eleven European languages).

425

Information Analysis of Rail Track for Predictive Maintenance  

Microsoft Academic Search

Track defects are deviation of actual from theoretical values of the tracks geometrical characteristics. Track defects are macroscopic and geometric in nature and are exclusively the consequence of train traffic. (5) Rail track maintenance in terms of track geometry and other modalities like rail profile, ultrasonic's etc has been typically based on use of reactive maintenance. In case of such

R B FAIZ; S. SINGH

426

TRIAC: A code for track measurements using image analysis tools  

Microsoft Academic Search

A computer program named TRIAC written in MATLAB has been developed for track recognition and track parameters measurements from images of the Solid State Nuclear Track Detectors CR39. The program using image analysis tools counts the number of tracks for dosimetry proposes and classifies the tracks according to their radii for the spectrometry of alpha-particles. Comparison of manual scanning counts

D. L. Patiris; K. Blekas; K. G. Ioannides

2006-01-01

427

Development of a small tracking camera system for mobile platforms  

Microsoft Academic Search

Recently, there are many needs for small tracking camera systems to be mounted on mobile platforms, such as bikes, cars, etc., to tracking some targets stably in a perturbation environment. To meet the needs, a small tracking camera system has been developed by authors. The purpose of the tracking camera system is both to stabilize the camera and to track

Tomohisa Aruga; Naoyuki Wada; A. Ming; N. Kurakane; M. Satoh

2009-01-01

428

Joint Recognition of Complex Events and Track Matching  

Microsoft Academic Search

Abstract We present a novel method for jointly performing recog- nition of complex events and linking fragmented tracks into coherent, long-duration tracks. Many event recognition methods require highly accurate tracking, and may fail when tracks corresponding to event actors are fragmented or partially missing. However, these conditions occur fre- quently from occlusions, traffic and tracking errors. Re- cently, methods have

Michael T. Chan; Anthony Hoogs; Rahul Bhotika; A. G. Amitha Perera; John Schmiederer; Gianfranco Doretto

2006-01-01

429

Tracking people on a torus.  

PubMed

We present a framework for monocular 3D kinematic pose tracking and viewpoint estimation of periodic and quasi-periodic human motions from an uncalibrated camera. The approach we introduce here is based on learning both the visual observation manifold and the kinematic manifold of the motion using a joint representation. We show that the visual manifold of the observed shape of a human performing a periodic motion, observed from different viewpoints, is topologically equivalent to a torus manifold. The approach we introduce here is based on the supervised learning of both the visual and kinematic manifolds. Instead of learning an embedding of the manifold, we learn the geometric deformation between an ideal manifold (conceptual equivalent topological structure) and a twisted version of the manifold (the data). Experimental results show accurate estimation of the 3D body posture and the viewpoint from a single uncalibrated camera. PMID:19147879

Elgammal, Ahmed; Lee, Chan-Su

2009-03-01

430

Position and orientation tracking system  

DOEpatents

A position and orientation tracking system presents a laser scanning apparatus having two measurement pods, a control station, and a detector array. The measurement pods can be mounted in the dome of a radioactive waste storage silo. Each measurement pod includes dual orthogonal laser scanner subsystems. The first laser scanner subsystem is oriented to emit a first line laser in the pan direction. The second laser scanner is oriented to emit a second line laser in the tilt direction. Both emitted line lasers scan planes across the radioactive waste surface to encounter the detector array mounted on a target robotic vehicle. The angles of incidence of the planes with the detector array are recorded by the control station. Combining measurements describing each of the four planes provides data for a closed form solution of the algebraic transform describing the position and orientation of the target robotic vehicle. 14 figs.

Burks, B.L.; DePiero, F.W.; Armstrong, G.A.; Jansen, J.F.; Muller, R.C.; Gee, T.F.

1998-05-05

431

Etched tracks and serendipitous dosimetry.  

PubMed

Nuclear tracks in detectors that just happened to be there can be found in unexpected places. Eyeglasses, household glass, minerals, objects that were exposed to nuclear explosions, and space equipment on the moon are examples. Such materials allow us to measure doses of past radon exposures, cosmic-ray fluences, fission rates and neutrons. Incidental results include measuring mountain-building rates and deciding where finding oil is likely (or unlikely); in another case erosion rates of surface materials in space are found. New results that assess the effects of hydration layers on the leaching out from glass surfaces of imbedded alpha-recoil nuclei imply that long-term, retrospective radon measurements can be made more reliable by selecting only glass with compact hydration layers. PMID:16644937

Fleischer, Robert L; Chang, Sekyung; Farrell, Jeremy; Herrmann, Rachel C; MacDonald, Jonathan; Zalesky, Marek; Doremus, Robert H

2006-04-27

432

Tracking Multiple Humans in Complex Situations  

Microsoft Academic Search

Tracking multiple humans in complex situations is challenging. The difficulties are tackled with appropriate knowledge in the form of various models in our approach. Human motion is decomposed into its global motion and limb motion. In the first part, we show how multiple human objects are segmented and their global motions are tracked in 3D using ellipsoid human shape models.

Tao Zhao; Ramakant Nevatia

2004-01-01

433

DERI at TREC 2008 Enterprise Search Track.  

National Technical Information Service (NTIS)

This paper describes the work carried out by DERI for the Enterprise Search track at TREC 2008. We participated in both the expert search task and document search task of the track. For both tasks we made use of novel learned term-weighting schemes. For t...

C. O'Riordan R. Cummins

2008-01-01

434

Hemifield Effects in Multiple Identity Tracking  

PubMed Central

In everyday life, we often need to attentively track moving objects. A previous study has claimed that this tracking occurs independently in the left and right visual hemifields (Alvarez & Cavanagh, 2005, Psychological Science,16, 637–647). Specifically, it was shown that observers were much more accurate at tracking objects that were spread over both visual hemifields as opposed to when all were confined to a single visual hemifield. In that study, observers were not required to remember the identities of the objects. Conversely, in real life, there is seldom any benefit to tracking an object unless you can also recall its identity. It has been predicted that when observers are required to remember the identities of the tracked objects a bilateral advantage should no longer be observed (Oksama & Hyönä, 2008, Cognitive Psychology, 56, 237–283). We tested this prediction and found that a bilateral advantage still occurred, though it was not as strong as when observers were not required to remember the identities of the targets. Even in the later case we found that tracking was not completely independent in the two visual hemifields. We present a combined model of multiple object tracking and multiple identity tracking that can explain our data.

Hudson, Charlotte; Howe, Piers D. L.; Little, Daniel R.

2012-01-01

435

Object tracking and classification in aerial videos  

NASA Astrophysics Data System (ADS)

In the intelligence community, aerial video has become one of the fastest growing data sources and it has been extensively used in intelligence, surveillance, reconnaissance, tactical and security applications. This paper presents a tracking approach to detect moving vehicles and person in such videos taken from aerial platform. In our approach, we combine the layer segmentation approach with background stabilization and post-tracking refinement to reliably detect small moving objects at the relatively low processing speed. For each individual moving object, a corresponding layer is created to maintain an independent appearance and motion model during the tracking process. After the online tracking process, we apply a post-tracking refinement process to link the track fragments into a long consistent track ID to further reduce false alarm and increase detection rate. Furthermore, a vehicle and person classifier is also integrated into the approach to identify the moving object categories. The classifier is based on image histogram of gradient (HOG), which is more reliable to illumination variation or camera automatic gain change. Finally, we report the results of our algorithms on a large scale of EO and IR data set collected from VIVID program, and the results show that our approach achieved a good and stable tracking performance on the data set that is more than eight hours.

Xiao, Jiangjian; Cheng, Hui; Feng, Han; Yang, Changjiang

2008-05-01

436

Face verification through tracking facial features  

Microsoft Academic Search

We propose an algorithm for face verification through tracking facial features by using sequential importance sampling. Specifically, we first formulate tracking as a Bayesian inference problem and propose to use Markov chain Monte Carlo techniques for obtaining an empirical solution. A reparameterization is introduced under parametric motion assumption, which facilitates the empirical estimation and also allows verification to be addressed

Baoxin Li; Rama Chellappa

2001-01-01

437

Tracking Clusters in Evolving Data Sets  

Microsoft Academic Search

dynamically fine tune the server to obtain better As organizations accumulate data over time, the problem of tracking how patterns evolve becomes important. In this paper, we present an algorithm to track the evolution of cluster models in a stream of data. Our algorithm is based on the applica- tion of bounds derived using Chernoff's inequality and makes use of

Daniel Barbará; Ping Chen

2001-01-01

438

Satellite tracking system analysis through computer simulation  

Microsoft Academic Search

An outline of the Satellite Orbit Determination Program (SORD-II), developed at Yokosuka Electrical Communication Laboratory, is presented. This program uses the general perturbation theory proposed by Kozai (1959) and the weighted least squares method. Through computer simulation, it is confirmed that the program works satisfactorily. At the same time, several conclusions are reached about tracking station disposition conditions and tracking

Y. Nagai

1977-01-01

439

Ubiquitous GPS vehicle tracking and management system  

Microsoft Academic Search

Global Positioning System (GPS) is becoming widely used for tracking and monitoring vehicles. Many systems have been created to provide such services which make them popular and needed more than ever before. In this paper a “GPS vehicle tracking system” is proposed. This system is useful for fleet operators in monitoring driving behavior of employees or parents monitoring their teen

Iman M. Almomani; Nour Y. Alkhalil; Enas M. Ahmad; Rania M. Jodeh

2011-01-01

440

Overview of the TREC 2009 Entity Track.  

National Technical Information Service (NTIS)

The goal of the entity track is to perform entity-oriented search tasks on the World Wide Web. Many user information needs would be better answered by specific entities instead of just any type of documents. The track defines entities as 'typed search res...

A. P. Vries K. Balog P. Serdyukov P. Thomas T. Westerveld

2009-01-01

441

Tracking error: a multistage portfolio model  

Microsoft Academic Search

We study multistage tracking error problems. Difierent tracking error measures, commonly used in static models, are discussed as well as some problems which arise when we move from static to dynamic models. We are interested in dynamically replicating a benchmark using only a small subset of assets, considering transaction costs due to rebalancing and introducing a liquidity component in the

Diana Barro; Elio Canestrelli

2009-01-01

442

Receiving and Tracking Phase Modulated Signals.  

National Technical Information Service (NTIS)

An apparatus and technique are described for receiving and tracking analog or digital phase modulated signals from 0 deg to 360 deg phase shift. In order to track a signal with many phases, a detector discerns the phase modulation of the incoming signal a...

S. Villarreal S. D. Lenett H. S. Kobayashi

1980-01-01

443

Space object tracking with delayed measurements  

Microsoft Academic Search

This paper is concerned with the nonlinear filtering problem for tracking a space object with possibly delayed measurements. In a distributed dynamic sensing environment, due to limited communication bandwidth and long distances between the earth and the satellites, it is possible for sensor reports to be delayed when the tracking filter receives them. Such delays can be complete (the full

Huimin Chen; Dan Shen; Genshe Chen; Erik Blasch; Khanh Pham

2010-01-01

444

Tracking people in mixed modality systems  

NASA Astrophysics Data System (ADS)

In traditional surveillance systems tracking of objects is achieved by means of image and video processing. The disadvantages of such surveillance systems is that if an object needs to be tracked - it has to be observed by a video camera. However, geometries of indoor spaces typically require a large number of video cameras to provide the coverage necessary for robust operation of video-based tracking algorithms. Increased number of video streams increases the computational burden on the surveillance system in order to obtain robust tracking results. In this paper we present an approach to tracking in mixed modality systems, with a variety of sensors. The system described here includes over 200 motion sensors as well as 6 moving cameras. We track individuals in the entire space and across cameras using contextual information available from the motion sensors. Motion sensors allow us to almost instantaneously find plausible tracks in a very large volume of data, ranging in months, which for traditional video search approaches could be virtually impossible. We describe a method that allows us to evaluate when the tracking system is unreliable and present the data to a human operator for disambiguation.

Ivanov, Yuri; Sorokin, Alexander; Wren, Christopher; Kaur, Ishwinder

2007-01-01

445

Research on Enterprise Track of TREC 2008.  

National Technical Information Service (NTIS)

This is the third year that we (ICT-CAS team) participated in the Enterprise Track of TREC. The track of this year includes two tasks, being document search task and expert search task. As to the document search task, we compare two retrieval models, name...

H. Shen L. Wang W. Bi X. Cheng Y. Liu

2008-01-01

446

An advanced arc track resistant airframe wire  

Microsoft Academic Search

Tensolite, a custom cable manufacturer specializing in high temperature materials as the dielectric medium, develops an advance arc track resistant airframe wire called Tufflite 2000. Tufflite 2000 has the following advantages over the other traditional wires: lighter weight and smaller in diameter; excellent wet and dry arc track resistance; superior dynamic cut-through performance even at elevated temperatures; flight proven performance

J. Beatty

1995-01-01

447

Infrared small target tracking based on SOPC  

NASA Astrophysics Data System (ADS)

The paper presents a low cost FPGA based solution for a real-time infrared small target tracking system. A specialized architecture is presented based on a soft RISC processor capable of running kernel based mean shift tracking algorithm. Mean shift tracking algorithm is realized in NIOS II soft-core with SOPC (System on a Programmable Chip) technology. Though mean shift algorithm is widely used for target tracking, the original mean shift algorithm can not be directly used for infrared small target tracking. As infrared small target only has intensity information, so an improved mean shift algorithm is presented in this paper. How to describe target will determine whether target can be tracked by mean shift algorithm. Because color target can be tracked well by mean shift algorithm, imitating color image expression, spatial component and temporal component are advanced to describe target, which forms pseudo-color image. In order to improve the processing speed parallel technology and pipeline technology are taken. Two RAM are taken to stored images separately by ping-pong technology. A FLASH is used to store mass temp data. The experimental results show that infrared small target is tracked stably in complicated background.

Hu, Taotao; Fan, Xiang; Zhang, Yu-Jin; Cheng, Zheng-Dong; Zhu, Bin

2011-01-01

448

A general-purpose laser tracking station  

Microsoft Academic Search

The paper describes the laser rangefinder used at a general-purpose laser tracking station for purposes of geodesy and satellite tracking. The basic features of the systems composing the station are considered with particular attention given to the station optics.

A. V. Stoikov; T. P. Peev; S. D. Dzynov; V. L. Tashev; M. K. Abele

1988-01-01

449

Introduction to the experience reports track  

Microsoft Academic Search

It is our great pleasure to welcome you to the Experience Reports Track of the 27th International Conference on Software Engineering (ICSE). The objective of the Experience Reports Track is to establish a dialogue between software practitioners and software engineering researchers on the benefits, obstacles, and weaknesses of applying software engineering principles, techniques, methods, processes, and tools in an industrial

Constance L. Heitmeyer; Klaus Pohl

2005-01-01

450

Concepts in Real-Time Video Tracking.  

National Technical Information Service (NTIS)

This report describes the real-time video (RTV) tracking system which will be deployed at the White Sands Missile Range (WSMR) during fiscal year 1979. This tracking system utilizes a distributive array of the five high-speed microprocessors to implement ...

A. L. Gilbert M. K. Giles

1978-01-01

451

Multi-Object Tracking in Video  

Microsoft Academic Search

T his paper reports on tracking of multiple objects using color histogram backprojection and motion cues. Four tasks which facilitate this are discussed. The first is an adaptive color histogram backprojection (which builds upon the works of Swain and Ballard) and its application to tracking of multiple objects in video sequences. The second task is designing eÅcient fast blob detectors

Johnson I. Agbinya; David Rees

1999-01-01

452

Multitarget tracking with HRR wavelets features  

Microsoft Academic Search

This paper presents an algorithm for multitarget tracking using wavelets features, which effectively combines information from both high resolution range (HRR) profiles and ground moving target indication (GMTI) radar reports. With assistance of HRR wavelets features, a GMTI tracker based on a probabilistic data association logic can effectively track ground moving targets in confusing scenarios.

Lang Hong

2002-01-01

453

Computer Modeling of Tank Track Elastomers.  

National Technical Information Service (NTIS)

Computer models of the T142, T156 and the British Chieftain tank tracks have been studied as part of a program to examine the tank-track-pad failure problem. The modeling is based on the finite element method with two different models being used to evalua...

D. R. Lesuer A. Goldberg J. Patt

1985-01-01

454

Omnidirectional Vision Tracking with Particle Filter  

Microsoft Academic Search

Visual tracking is one of the most important topics of computer vision. Challenging situations occurs when the time between frames is long enough to show significant spatial jumps of the target being tracked or when the target has unexpected motions. In this paper, we offer an alternative to these situations. We use background subtraction to find the foreground regions (regions

Jaime Ortegon-aguilar; Eduardo Bayro-corrochano

2006-01-01

455

Track and Field Omnibook. Second Edition.  

ERIC Educational Resources Information Center

This track and field text is a second edition of the 1971 Track and Field Omnibook, a synthesis of the author's forty-five years experience as a participant in and coach of the sport. Divided into two sections, the text deals with both the event-specific techniques of coaching and the overall development of the coaching role. Part one, "The Human…

Doherty, J. Kenneth

456

The Tracking and Data Relay Satellite  

Microsoft Academic Search

The first Tracking and Data Relay Satellite (TDRS), a 5000 lb space vehicle that is to be launched by NASA in 1983 via the Space Shuttle, is described. The three principal modules of the TDRS are discussed, namely (1) the spacecraft structure module that houses the attitude control, electrical power, propulsion, and telemetry tracking, and command subsystems; (2) the payload

W. R. Harper; W. L. Woodson

1981-01-01

457

Attitude tracking control using recursive passivation technique  

Microsoft Academic Search

The main problem addressed is the attitude tracking control of a rigid satellite. A nonlinear feedback control scheme is presented, based on recursive passivation through backstepping. The control structure designed consists of PID-like feedback plus some feedforward terms, which achieves enhancing the tracking performance by compensating for the plant dynamics. Quaternion attitude representation, which is four-parameter and void of singularity

Boqi Xi; Guoxing Yi; Bochang Shen

2006-01-01

458

Gaze tracking as a game input interface  

Microsoft Academic Search

The purpose of this paper is to present current findings as well as previous work in the field of gaze tracking and propose developing methods of applying them in games with the purpose of enhancing the gameplay experience. First, eye-tracking as a technology and historical aspects of it are briefly presented. A brief summary of important findings and a review

Dan Hartescu; Andreas Oikonomou

2011-01-01

459

Development of Rubber Pads for Tracked Vehicles.  

National Technical Information Service (NTIS)

Improvement in the wear resistance of rubber track pads was sought through compounding studies and evaluation of rubber-to-metal bonding agents. Correlation was sought between laboratory tests on the rubber component of track pads and service tests on the...

E. W. Bergstrom J. R. Cerny

1970-01-01

460

Contrails, contrail cirrus, and ship tracks  

Microsoft Academic Search

The following text is an enlarged version of the conference tutorial lecture on con- trails, contrail cirrus, and ship tracks. I start with a general introduction into aerosol effects on clouds. Contrail formation and persistence, aviation's share to cirrus trends and ship tracks are treated then.

K. Gierens

2006-01-01

461

Partnership Attitude Tracking Study, Teens 2002.  

ERIC Educational Resources Information Center

|The Partnership Attitude Tracking Study (PATS) is Partnership for a Drug Free America's (PDFA) unique contribution to the field of substance abuse prevention. An annual study that tracks the attitudes consumers have about illegal drugs, this research examines what PDFA's target audiences think and feel about various drugs. After a decade of…

2002

462

Galilean Tracks in the Physics Lab  

ERIC Educational Resources Information Center

|Variations of Galileo's famous track experiments in acceleration are commonly performed in high school and college. The purpose of this article is to present a sequence of three low-tech basic kinematics experiments using Galilean tracks that can be set up extremely quickly and yet generally yield excellent results. A low-cost construction method…

Hellman, Walter

2011-01-01

463

Tracking and Data Acquisition for Space Exploration  

Microsoft Academic Search

The tracking and data acquisition systems provide the key link between the remote spacecraft and the scientific experimenter on the ground. The operation of the space experiment takes place through the links of command, telemetry and tracking. The evolution from the early very simple spacecraft missions toward more complex and sophisticated missions has been paralleled by a similar evolution in

Robert J. Coates

1969-01-01

464

Tracking and data acquisition for space exploration  

Microsoft Academic Search

The tracking and data acquisition systems provide the key link between the remote spacecraft and the scientific experimenter on the ground. The operation of the space experiment takes place through the links of command, telemetry and tracking. The evolution from the early very simple spacecraft missions toward more complex and sophisticated missions has been paralleled by a similar evolution in

Robert J. Coates

1969-01-01

465

Way-point tracking control of ships  

Microsoft Academic Search

The paper considers way-point tracking control of ships using yaw torque control. A full state feedback control law is developed using a cascaded approach, and proved to globally asymptotically stabilize the heading and the cross-track error of the ship. Simulation results are presented

K. Y. Pettersen; E. Lefeber

2001-01-01

466

UPTIME: Ubiquitous pedestrian tracking using mobile phones  

Microsoft Academic Search

The mission of tracking a pedestrian is valuable for many applications including walking distance estimation for the purpose of pervasive healthcare, museum and shopping mall guides, and locating emergency responders. In this paper, we show how accurate and ubiquitous tracking of a pedestrian can be performed using only the inertial sensors embedded in his\\/her mobile phone. Our work depends on

Moustafa Alzantot; Moustafa Youssef

2012-01-01

467

TRACK : the new beam dynamics code.  

SciTech Connect

The new ray-tracing code TRACK originally developed to fulfill the special requirements of the RIA accelerator systems is a general beam dynamics code. It is currently being used for the design and simulation of future proton and heavy-ion linacs at several Labs. This paper presents a general description of the code TRACK emphasizing its main new features and recent updates.

Aseev, V. N.; Ostroumov, P. N.; Lessner, E. S.; Mustapha, B.; Physics

2005-01-01

468

Prediction for human motion tracking failures  

Microsoft Academic Search

Abstract, We propose a new and effective method of predicting tracking failures and apply it to the robust analysis of gait and human motion. We define a tracking failure as an event and de-scribe its temporal characteristics using a hidden Markov model (HMM). We represent the human body using a three-dimensional, multicomponent structural model, where each component is designed to

Shiloh L. Dockstader; Nikita S. Imennov

2006-01-01

469

Track Reconstruction for the NIFFTE TPC  

NASA Astrophysics Data System (ADS)

The Global Nuclear Energy Partnership (GNEP) has funded the construction of a Time Projection Chamber (TPC) to be used for precision fission cross-section measurements through the Nuclear Energy Research Initiative (NERI). This poster shall illustrate the status of algorithms intended for intelligent track finding and track fitting using raw data obtained TPC simulations will be presented. The track fitting effort in this experiment has borrowed a number of ideas from high-energy physics along with other pattern recognition techniques not previously affiliated with experimental physics. Two track-finding techniques have been investigated. The Hough Transform is a brute force attempt at finding tracks. The second paradigm for track reconstruction, Binary Space Partitioning (BSP), was found to be less computationally expensive. BSP however had to be used in conjunction with a multilayer perceptron to rejoin tracks that were overly partitioned. To determine track fit parameters, an iterative Kalman Filter has been implemented that allows multiple scattering and energy losses to be taken into account to obtain unbiased errors.

Sharma, Sarvagya

2008-10-01

470

Track Reconstruction for the NIFFTE TPC  

NASA Astrophysics Data System (ADS)

The Global Nuclear Energy Partnership (GNEP) has funded the construction of a Time Projection Chamber (TPC) to be used for precision fission cross-section measurements through the Nuclear Energy Research Initiative (NERI). This poster shall illustrate the status of algorithms intended for intelligent track finding and track fitting using raw data obtained TPC simulations. The track fitting effort in this experiment has borrowed a number of ideas from high-energy physics along with other pattern recognition techniques not previously affiliated with experimental physics. Two track-finding techniques have been investigated. The Hough Transform is a brute force attempt at finding tracks. The second paradigm for track reconstruction, Binary Space Partitioning (BSP) was found to be less computationally expensive than the Hough Transform. BSP has been borrowed from the field of computer animation and rendering. To determine track fit parameters, an iterative Kalman Filter has been implemented that allows multiple scattering and energy losses to be taken into account to obtain unbiased errors. Fitted tracks obtained from the Kalman Filter were used to generate the best kinematic fit on the vertex.

Sharma, Sarvagya

2008-10-01

471

Visual tracking for multimodal human computer interaction  

Microsoft Academic Search

In this paper, we present visual tracking techniques for multimodal human computer interaction. First, we discuss techniques for tracking human faces in which human skin-color is used as a major feature. An adaptive stochastic model has been developed to characterize the skin-color distributions. Based on the maximum likelihood method, the model parameters can be adapted for different people and different

Jie Yang; Rainer Stiefelhagen; Uwe Meier; Alex Waibel

1998-01-01

472

Real-time closed-world tracking  

Microsoft Academic Search

A real-time tracking algorithm that uses contextual in- formation is described. The method is capable of simul- taneously tracking multiple, non-rigid objects when erratic movement and object collisions are common. A closed- world assumption is used to adaptively select and weight image features used for correspondence. Results of algo- rithm testing and the limitationsof the method are discussed. The algorithm

Stephen S. Intille; James W. Davis; Aaron F. Bobick

1997-01-01

473

Shadow resistant tracking using inertia constraints  

Microsoft Academic Search

In this paper, we present a new method for tracking objects with shadows. Traditional motion- based tracking schemes cannot usually distinguish the shadow from the object itself, and this results in a falsely captured object shape. If we want to util ize the object's shape information for a pattern recognition task, this poses a severe difficult y. In this paper

Hao Jiang; Mark S. Drew

2007-01-01

474

Shadow-resistant tracking in video  

Microsoft Academic Search

In this paper, we present a new method for tracking objects with shadows. Traditional motion-based tracking schemes cannot usually distinguish the shadow from the object itself, and this results in a falsely captured object shape, posing a severe difficulty for a pattern recognition task. In this paper we present a color processing scheme to project the image into an illumination

Hao Jiang; Mark S. Drew

2003-01-01

475

Robust Multiple Car Tracking with Occlusion Reasoning  

Microsoft Academic Search

Abstract: In this work we address the problem of occlusion in tracking multiple 3D objects in a knownenvironment and propose a new approach for tracking vehicles in road traffic scenes using anexplicit occlusion reasoning step. We employ a contour tracker based on intensity and motionboundaries. The motion of the contour of the vehicles in the image is assumed to be

Dieter Koller; Joseph Weber; Jitendra Malik

1994-01-01

476

Layer tracking asymptotics and domain decomposition  

SciTech Connect

In this paper we present a preliminary report on our work on the tracking of internal layers in a singularly-perturbed convection-diffusion equation. We show why such tracking may be desirable, and we also show how to do it using domain decomposition based on asymptotic analysis. 16 refs.

Brown, D.L. (Los Alamos National Lab., NM (USA)); Chin, R.C.Y. (Indiana Univ.-Purdue Univ., Indianapolis, IN (USA)); Hedstrom, G.W. (Lawrence Livermore National Lab., CA (USA)); Manteuffel, T.A. (Colorado Univ., Denver, CO (USA))

1990-01-01

477

Tracking Groups of Pedestrians in Video Sequences  

Microsoft Academic Search

This paper describes an algorithm for tracking groups of objects in video sequences. The main difficulties addressed in this work concern total occlusions of the objects to be tracked as well as group merging and splitting. A two layer solution is proposed to overcome these difficulties. The first layer produces a set of spatio temporal strokes based on low level

Jorge S. Marques; Pedro M. Jorge; Arnaldo J. Abrantes; J. M. Lemos

2003-01-01

478

Improved Performance Band Track Program: Test Report.  

National Technical Information Service (NTIS)

A seventeen inch lightweight improved performance band track was developed for use on the Automotive Test Rig (ATR), a 14 ton amphibious vehicle, under contract to the David Taylor Naval Ship R&D Center. The track was designed utilizing corrosion resistan...

S. W. Miller S. Fox

1985-01-01

479

A flexible multimodal object tracking system  

Microsoft Academic Search

In this paper we present a flexible multimodal object track- ing system. It is based on a particle filter which combines the outputs of different measurement methods (also called modes or cues) in a flexible manner. The modes for locat- ing the desired object can be selected depending on the spe- cific object which is to be tracked and the

Harald Breit; Gerhard Rigoll

2003-01-01

480

Automated Track Inspection Information and Its Use.  

National Technical Information Service (NTIS)

The paper describes the type of track inspection information provided by the Department of Transportation test cars (railroad) and the way it is to be used. The D.O.T. track inspection car program and a computer program from which gage data is produced ar...

T. P. Woll

1970-01-01

481

GPU COMPUTING FOR PARTICLE TRACKING  

SciTech Connect

This is a feasibility study of using a modern Graphics Processing Unit (GPU) to parallelize the accelerator particle tracking code. To demonstrate the massive parallelization features provided by GPU computing, a simplified TracyGPU program is developed for dynamic aperture calculation. Performances, issues, and challenges from introducing GPU are also discussed. General purpose Computation on Graphics Processing Units (GPGPU) bring massive parallel computing capabilities to numerical calculation. However, the unique architecture of GPU requires a comprehensive understanding of the hardware and programming model to be able to well optimize existing applications. In the field of accelerator physics, the dynamic aperture calculation of a storage ring, which is often the most time consuming part of the accelerator modeling and simulation, can benefit from GPU due to its embarrassingly parallel feature, which fits well with the GPU programming model. In this paper, we use the Tesla C2050 GPU which consists of 14 multi-processois (MP) with 32 cores on each MP, therefore a total of 448 cores, to host thousands ot threads dynamically. Thread is a logical execution unit of the program on GPU. In the GPU programming model, threads are grouped into a collection of blocks Within each block, multiple threads share the same code, and up to 48 KB of shared memory. Multiple thread blocks form a grid, which is executed as a GPU kernel. A simplified code that is a subset of Tracy++ [2] is developed to demonstrate the possibility of using GPU to speed up the dynamic aperture calculation by having each thread track a particle.

Nishimura, Hiroshi; Song, Kai; Muriki, Krishna; Sun, Changchun; James, Susan; Qin, Yong

2011-03-25

482

MMT nightly tracking logs: a web-enabled database for continuous evaluation of tracking performance  

NASA Astrophysics Data System (ADS)

Over the past few years, the MMT Observatory has developed a number of web browser front ends for operation interfaces and staff access to internal databases. Among these is a facility for viewed reduced tracking logs in both time series and FFTs for convenient examination of tracking performance. Part of the back-end software also keeps the tracking data in a searchable database, allowing data over long periods of time to be collected and analyzed to look for trends, the influence of environmental factors on tracking, and help detect tracking degradation in a timely manner.

Clark, D.; Gibson, J. D.; Porter, D.; Trebisky, T.

2012-09-01

483

Sheehan Suicidality Tracking Scale (Sheehan-STS)  

PubMed Central

Objective: Accurate and prospective assessments of treatment-emergent suicidal thoughts and behaviors are essential to both clinical care and randomized clinical trials. The Sheehan Suicidality Tracking Scale is a prospective, patient self-report or clinician-administered rating scale that tracks both treatment-emergent suicidal ideation and behaviors. The Sheehan Suicidality Tracking Scale was incorporated into a multicenter, randomized, double-blind, placebo-controlled, and active comparator study examining the efficacy of an experimental corticotropin-releasing factor antagonist (BMS-562086) for the treatment of generalized anxiety disorder. Method: The Sheehan Suicidality Tracking Scale was administered to subjects at baseline, Week 2, Week 4, and Week 8 or early termination. Subjects completed theSheehan Suicidality Tracking Scale by self report. The Sheehan Suicidality Tracking Scale was designated as an exploratory outcome measure in the study protocol, and post-hoc analyses were performed to examine the performance of the Sheehan Suicidality Tracking Scale. Results: A total of 82 subjects completed the Sheehan Suicidality Tracking Scale during the course of the study. Altogether, these subjects provided 297 completed Sheehan Suicidality Tracking Scale ratings across the study time points. Sixty-one subjects (n=25 placebo, n=24 BMS-562086, and n=12 escitalopram) had a baseline and at least one post-baseline Sheehan Suicidality Tracking Scale measurement. The mean change from baseline at Week 8 in the Sheehan Suicidality Tracking Scale total score was -0.10, -0.02, and -0.06 for escitalopram, placebo, and BMS-562086 groups, respectively. The sensitivity of the Sheehan Suicidality Tracking Scale and HAM-D Item #3 (suicide) for identifying subjects with suicidal thoughts or behaviors was 100 percent and 63 percent, respectively. Conclusions: The Sheehan Suicidality Tracking Scale may be a sensitive psychometric tool to prospectively assess for treatment-emergent suicidal thoughts and behaviors. Despite the small sample size and low occurrence of suicidal ideation during the course of this clinical trial, the self-reported Sheehan Suicidality Tracking Scale demonstrated increased sensitivity over the rater administered HAM-D Item #3 in identifying suicide related ideations and behaviors. Further research in larger study samples as well as in other psychiatric disorders are needed.

2009-01-01

484

Perspective tracking in progress: Do not disturb.  

PubMed

Two experiments tested the hypothesis that indirect false-belief tests allow participants to track a protagonist's perspective uninterruptedly, whereas direct false-belief tests disrupt the process of perspective tracking in various ways. For this purpose, adults' performance was compared on indirect and direct false-belief tests by means of continuous eye-tracking. Experiment 1 confirmed that the false-belief question used in direct tests disrupts perspective tracking relative to what is observed in an indirect test. Experiment 2 confirmed that perspective tracking is a continuous process that can be easily disrupted in adults by a subtle visual manipulation in both indirect and direct tests. These results call for a closer analysis of the demands of the false-belief tasks that have been used in developmental research. PMID:23948210

Rubio-Fernández, Paula

2013-08-14

485

An optical tracking system for virtual reality  

NASA Astrophysics Data System (ADS)

In this paper we present a low-cost 3D tracking system which we have developed and tested in order to move away from traditional 2D interaction techniques (keyboard and mouse) in an attempt to improve user's experience while using a CVE. Such a tracking system is used to implement 3D interaction techniques that augment user experience, promote user's sense of transportation in the virtual world as well as user's awareness of their partners. The tracking system is a passive optical tracking system using stereoscopy a technique allowing the reconstruction of three-dimensional information from a couple of images. We have currently deployed our 3D tracking system on a collaborative research platform for investigating 3D interaction techniques in CVEs.

Hrimech, Hamid; Merienne, Frederic

2009-03-01

486

Primitive Analysis of the Ship Tracking Problem.  

NASA Astrophysics Data System (ADS)

Satellite images reveal tracks of enhanced solar reflectivity in low-level stratus clouds over the ocean that are known to be produced by the aerosols emitted from diesel-powered ships. The question arises: Can we track a ship from such images? A primitive model of convection-diffusion of particles from the moving ship to the condensation level, and of formation of the detectable ship track, is developed. The analysis takes account of various influences, such as ship and wind velocity vectors. It yields, inter alia, the dimensions of the ship track and its disposition relative to the ship. Plausible parameter values give results in the observed range. Tracking is achieved for the simplified problem, but a paucity of meteorological and other data causes practical difficulties.

Philip, J. R.; Rottman, J. W.

2000-07-01

487

Online object tracking with sparse prototypes.  

PubMed

Online object tracking is a challenging problem as it entails learning an effective model to account for appearance change caused by intrinsic and extrinsic factors. In this paper, we propose a novel online object tracking algorithm with sparse prototypes, which exploits both classic principal component analysis (PCA) algorithms with recent sparse representation schemes for learning effective appearance models. We introduce l(1) regularization into the PCA reconstruction, and develop a novel algorithm to represent an object by sparse prototypes that account explicitly for data and noise. For tracking, objects are represented by the sparse prototypes learned online with update. In order to reduce tracking drift, we present a method that takes occlusion and motion blur into account rather than simply includes image observations for model update. Both qualitative and quantitative evaluations on challenging image sequences demonstrate that the proposed tracking algorithm performs favorably against several state-of-the-art methods. PMID:22692912

Wang, Dong; Lu, Huchuan; Yang, Ming-Hsuan

2012-06-05

488

Multi-object tracking of human spermatozoa  

NASA Astrophysics Data System (ADS)

We propose a system for tracking of human spermatozoa in phase-contrast microscopy image sequences. One of the main a