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Articles 1561 - 1590 of 6102
Full-Text Articles in Entire DC Network
Gradual Generalization Of Nautical Chart Contours With A Cube B-Spline Snake Model, Dandan Miao, Brian R. Calder
Gradual Generalization Of Nautical Chart Contours With A Cube B-Spline Snake Model, Dandan Miao, Brian R. Calder
Center for Coastal and Ocean Mapping
—B-spline snake methods have been used in cartographic generalization in the past decade, particularly in the generalization of navigational charts where this method yields good results with respect to the shoal-bias rules for generalization of chart contours. However, previous studies only show generalization results at particular generalization (or scale) levels, and the user can only see two conditions: before the generalization and after generalization, but nothing in between. This paper presents an improved method of using B-spline snakes for generalization in the context of nautical charts, where the generalization process is done gradually, and the user can see the complete …
The Use Of Forest Stand Age Information In An Atmospheric Co2 Inversion Applied To North America, Feng Deng, Jing M. Chen, Y. Pan, W. Peters, R. Birdsey, K. Mccullough, Jingfeng Xiao
The Use Of Forest Stand Age Information In An Atmospheric Co2 Inversion Applied To North America, Feng Deng, Jing M. Chen, Y. Pan, W. Peters, R. Birdsey, K. Mccullough, Jingfeng Xiao
All Materials
Atmospheric inversions have become an important tool in quantifying carbon dioxide (CO2) sinks and sources at a variety of spatiotemporal scales, but associated large uncertainties restrain the inversion research community from reaching agreement on many important subjects. We enhanced an atmospheric inversion of the CO2 flux for North America by introducing spatially explicit information on forest stand age for US and Canada as an additional constraint, since forest carbon dynamics are closely related to time since disturbance. To use stand age information in the inversion, we converted stand age into an age factor, and included the covariances between subcontinental regions …
Smart Students Study Cutting-Edge Science With Project Smart, Unh Communications And Public Affairs
Smart Students Study Cutting-Edge Science With Project Smart, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Looking For A Learning Moment, Unh Communications And Public Affairs
Looking For A Learning Moment, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Shaping Our Future: Integration From The Perspective Of Bhutanese Young Adults In New Hampshire, Jessica Santos, Devika Bhandari, Shyam Gautam, Dixya Mishra, And Bishnu Niroula, And The Bhutanese Community Of New Hampshire
Shaping Our Future: Integration From The Perspective Of Bhutanese Young Adults In New Hampshire, Jessica Santos, Devika Bhandari, Shyam Gautam, Dixya Mishra, And Bishnu Niroula, And The Bhutanese Community Of New Hampshire
Manchester Research Group
Report of needs and immigrant integration in New Hampshire for the Bhutanese community.
Satellite-Derived Bathymetry: A Reconnaissance Tool For Hydrography, Shachak Pe'eri, Christopher Parrish, Lee Alexander, Andy Armstrong
Satellite-Derived Bathymetry: A Reconnaissance Tool For Hydrography, Shachak Pe'eri, Christopher Parrish, Lee Alexander, Andy Armstrong
Center for Coastal and Ocean Mapping
No abstract provided.
Evaluating The Usace's Ncmp For Noaa Charting Operations, Gretchen Imahori, Shachak Pe'eri, Christopher Parrish, Toshi Wozumi, Stephen A. White, Inseong Jeong, Christopher L. Macon
Evaluating The Usace's Ncmp For Noaa Charting Operations, Gretchen Imahori, Shachak Pe'eri, Christopher Parrish, Toshi Wozumi, Stephen A. White, Inseong Jeong, Christopher L. Macon
Center for Coastal and Ocean Mapping
No abstract provided.
Heavenly Science: Student Balloons Video Earth Below, Space Above, Unh Communications And Public Affairs
Heavenly Science: Student Balloons Video Earth Below, Space Above, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
New Nsf Epscor Award Tackles Problems Related To Closure Of Shellfish Beds And Beach Advisories, Unh Communications And Public Affairs
New Nsf Epscor Award Tackles Problems Related To Closure Of Shellfish Beds And Beach Advisories, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Revision Of Empirical Electric Field Modeling In The Inner Magnetosphere Using Cluster Data, Hiroshi Matsui, Harlan E. Spence, Y. V. Khotyaintsev, P. A. Lindqvist
Revision Of Empirical Electric Field Modeling In The Inner Magnetosphere Using Cluster Data, Hiroshi Matsui, Harlan E. Spence, Y. V. Khotyaintsev, P. A. Lindqvist
Physics & Astronomy
Using Cluster data from the Electron Drift (EDI) and the Electric Field and Wave (EFW) instruments, we revise our empirically-based, inner-magnetospheric electric field (UNH-IMEF) model at 22.662 mV/m; K-p<1, 1K(p)<2, 2K(p)<3, 3K(p)<4, 4K(p)<5, and K(p)4(+). Patterns consist of one set of data and processing for smaller activities, and another for higher activities. As activity increases, the skewed potential contour related to the partial ring current appears on the nightside. With the revised analysis, we find that the skewed potential contours get clearer and potential contours get denser on the nightside and morningside. Since the fluctuating components are not negligible, standard deviations from the modeled values are included in the model. In this study, we perform validation of the derived model more extensively. We find experimentally that the skewed contours are located close to the last closed equipotential, consistent with previous theories. This gives physical context to our model and serves as one validation effort. As another validation effort, the derived results are compared with other models/measurements. From these comparisons, we conclude that our model has some clear advantages over the others.
2013-2014 Graduate Catalog Granite State College University System Of New Hampshire, Granite State College
2013-2014 Graduate Catalog Granite State College University System Of New Hampshire, Granite State College
Granite State College Catalogs
No abstract provided.
The Preservation Of Atmospheric Nitrate In Snow At Summit, Greenland, Dorothy L. Fibiger, Meredith G. Hastings, Jack E. Dibb, L Gregory Huey
The Preservation Of Atmospheric Nitrate In Snow At Summit, Greenland, Dorothy L. Fibiger, Meredith G. Hastings, Jack E. Dibb, L Gregory Huey
Earth Sciences
There is great interest in using nitrate NO3 isotopic composition in ice cores to track the history of precursor nitrogen oxides (NOx = NO + NO2) in the atmosphere. Nitrate NO3 however can be lost from the snow by surface processes, such as photolysis back to NOx upon exposure to sunlight, making it difficult to interpret records of NO3 as a tracer of atmospheric NOx loading. In a campaign consisting of two field seasons (May–June) at Summit, Greenland, high temporal frequency surface snow samples were collected and analyzed for the oxygen isotopic composition of NO3. The strong, linear relationship observed …
Snow Spectral Albedo At Summit, Greenland: Measurements And Numerical Simulations Based On Physical And Chemical Properties Of The Snowpack, Carlo Carmagnola, Florent Domine, Marie Dumont, Patrick Wright, B Strellis, M Bergin, Jack E. Dibb, G Picard, Q Libois, L Arnaud, S Morin
Snow Spectral Albedo At Summit, Greenland: Measurements And Numerical Simulations Based On Physical And Chemical Properties Of The Snowpack, Carlo Carmagnola, Florent Domine, Marie Dumont, Patrick Wright, B Strellis, M Bergin, Jack E. Dibb, G Picard, Q Libois, L Arnaud, S Morin
Earth Sciences
The broadband albedo of surface snow is determined both by the near-surface profile of the physical and chemical properties of the snowpack and by the spectral and angular characteristics of the incident solar radiation. Simultaneous measurements of the physical and chemical properties of snow were carried out at Summit Camp, Greenland (72°36´ N, 38°25´ W, 3210 m a.s.l.) in May and June 2011, along with spectral albedo measurements. One of the main objectives of the field campaign was to test our ability to predict snow spectral albedo by comparing the measured albedo to the albedo calculated with a radiative transfer …
Characterization Of Optical Communication In A Leader-Follower Unmanned Underwater Vehicle Formation, Firat Eren, Shachak Pe'eri, May-Win Thein
Characterization Of Optical Communication In A Leader-Follower Unmanned Underwater Vehicle Formation, Firat Eren, Shachak Pe'eri, May-Win Thein
Center for Coastal and Ocean Mapping
As part of the research to development an optical communication design of a leader-follower formation between unmanned underwater vehicles (UUVs), this paper presents light field characterization and design configuration of the hardware required to allow the use of distance detection between UUVs. The study specifically is targeting communication between remotely operated vehicles (ROVs). As an initial step in this study, the light field produced from a light source mounted on the leader UUV was empirically characterized and modeled. Based on the light field measurements, a photo-detector array for the follower UUV was designed. Evaluation of the communication algorithms to monitor …
Near Resonance Acoustic Scattering From Organized Schools Of Juvenile Atlantic Bluefin Tuna (Thunnus Thynnus), Thomas C. Weber, Molly Lutcavage, Madeline L. Schroth-Miller
Near Resonance Acoustic Scattering From Organized Schools Of Juvenile Atlantic Bluefin Tuna (Thunnus Thynnus), Thomas C. Weber, Molly Lutcavage, Madeline L. Schroth-Miller
Center for Coastal and Ocean Mapping
Schools of Atlantic bluefin tuna (Thunnus thynnus) can exhibit highly organized spatial structure within the school. This structure was quantified for dome shaped schools using both aerial imagery collected from a commercial spotter plane and 400 kHz multibeam echo sounder data collected on a fishing vessel in 2009 in Cape Cod Bay, MA. Observations from one school, containing an estimated 263 fish within an approximately ellipsoidal volume of 1900 m3, were used to seed an acoustic model that estimated the school target strength at frequencies between 10 and 2000 Hz. The fish's swimbladder resonance was estimated to occur at approximately …
Acoustic And Optical Observations Of Methane Gas Seeps In The Gulf Of Mexico, Thomas C. Weber, Kevin W. Jerram, Yuri Rzhanov, Larry A. Mayer, Dave Lovalvo
Acoustic And Optical Observations Of Methane Gas Seeps In The Gulf Of Mexico, Thomas C. Weber, Kevin W. Jerram, Yuri Rzhanov, Larry A. Mayer, Dave Lovalvo
Center for Coastal and Ocean Mapping
In 2011 and 2012, measurements of acoustic backscatter from natural methane seeps were made in the northern Gulf of Mexico in water depths between 1000-2000 m. The measurementswere made using a calibrated 18 kHz echo sounder with an 11 degree beamwidth in order to estimate the depth-dependent target strength (TS). The TS data indicate a wide variation in the rate of gas seepage from the seafloor. Several of these seeps were revisited with a remotely operated vehicle in order to optically assess the bubble size distribution and to estimate the rate at which gas bubbles were exiting the seafloor. The …
Optimizing Resolution And Uncertainty In Bathymetric Sonar Systems, Val E. Schmidt, Thomas C. Weber, Xavier Lurton
Optimizing Resolution And Uncertainty In Bathymetric Sonar Systems, Val E. Schmidt, Thomas C. Weber, Xavier Lurton
Center for Coastal and Ocean Mapping
Bathymetric sonar systems (whether multibeam or phase-differencing sidescan) contain an inherent trade-off between resolution and uncertainty. Systems are traditionally designed with a fixed spatial resolution, and the parameter settings are optimized to minimize the uncertainty in the soundings within that constraint. By fixing the spatial resolution of the system, current generation sonars operate sub-optimally when the SNR is high, producing soundings with lower resolution than is supportable by the data, and inefficiently when the SNR is low, producing high-uncertainty soundings of little value. Here we propose fixing the sounding measurement uncertainty instead, and optimizing the resolution of the system within …
An Imaging Neutron/Gamma-Ray Spectrometer, Amanda C. Madden, Peter F. Bloser, Dominique Fourguette, Liane Larocque, Matt Lewis, Jason S. Legere, Mark L. Mcconnell, Marissa Rouseau, James M. Ryan
An Imaging Neutron/Gamma-Ray Spectrometer, Amanda C. Madden, Peter F. Bloser, Dominique Fourguette, Liane Larocque, Matt Lewis, Jason S. Legere, Mark L. Mcconnell, Marissa Rouseau, James M. Ryan
Space Science Center
We present the test results of a neutron/gamma-ray imaging spectrometer for the identification and location of radioactive and special nuclear materials. Radioactive materials that could be fashioned into a radiation dispersal device typically emit gamma rays, while fissile materials such as uranium and plutonium emit both neutrons and gamma rays via spontaneous or induced fission. The simultaneous detection of neutrons and gamma rays is a clear indication of the presence of fissile material. The instrument works as a double-scatter telescope, requiring a neutron or gamma ray to undergo an interaction in two detectors to be considered a valid event. While …
Math Lecturer Hits Prime Time, Unh Communications And Public Affairs
Math Lecturer Hits Prime Time, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Mechanisms Of Nutrient Limitation And Nutrient Acquisition In Managed And Unmanaged Forest Ecosystems, Matthew A. Vadeboncoeur
Mechanisms Of Nutrient Limitation And Nutrient Acquisition In Managed And Unmanaged Forest Ecosystems, Matthew A. Vadeboncoeur
Doctoral Dissertations
Understanding the interactions between global change, human and natural disturbances, and other factors on biogeochemical processes in forests is necessary to ensure the sustainability of forest management. Here I report the results of several investigations into nutrient acquisition processes in the forests of New Hampshire. I begin with a meta-analysis of fertilization studies showing that phosphorus (P) and calcium (Ca) as well as nitrogen (N) may limit primary production in deciduous forests of the region. Because these limiting nutrients are all removed from the ecosystem when trees are harvested, I compared nutrient budgets under a range of harvesting scenarios with …
Ibex: The Little Satellite That Could, Unh Communications And Public Affairs
Ibex: The Little Satellite That Could, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
The New Hampshire, Vol. 102 [103], No. 49 (May 3, 2013), The New Hampshire
The New Hampshire, Vol. 102 [103], No. 49 (May 3, 2013), The New Hampshire
The New Hampshire Print Edition
An independent student produced newspaper from the University of New Hampshire. This volume was printed as 102, but it is the 103rd volume in the series. This was corrected in pencil.
Big Things Have Small Beginnings, Meg Heckman
A "Gate City" Welcome, Unh Communications And Public Affairs
A "Gate City" Welcome, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Measurements Of Galactic Cosmic Ray Shielding With The Crater Instrument, C. Zeitlin, A. W. Case, Harlan E. Spence, Nathan A. Schwadron, M. Golightly, Jody K. Wilson, J. C. Kasper, J. B. Blake, M. D. Looper, J. E. Mazur, L. W. Townsend, Y. Iwata
Measurements Of Galactic Cosmic Ray Shielding With The Crater Instrument, C. Zeitlin, A. W. Case, Harlan E. Spence, Nathan A. Schwadron, M. Golightly, Jody K. Wilson, J. C. Kasper, J. B. Blake, M. D. Looper, J. E. Mazur, L. W. Townsend, Y. Iwata
Physics & Astronomy
[1] The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) instrument aboard the Lunar Reconnaissance Orbiter has been measuring energetic charged particles from the galactic cosmic rays (GCRs) and solar particle events in lunar orbit since 2009. CRaTER includes three pairs of silicon detectors, separated by pieces of tissue-equivalent plastic that shield two of the three pairs from particles incident at the zenith-facing end of the telescope. Heavy-ion beams studied in previous ground-based work have been shown to be reasonable proxies for the GCRs when their energies are sufficiently high. That work, which included GCR simulations, led to predictions …
On The Export Of Reactive Nitrogen From Asia: NoX Partitioning And Effects On Ozone, T H. Bertram, Paul J. Wooldridge, Jack E. Dibb, Robert C. Cohen, A E. Perring
On The Export Of Reactive Nitrogen From Asia: NoX Partitioning And Effects On Ozone, T H. Bertram, Paul J. Wooldridge, Jack E. Dibb, Robert C. Cohen, A E. Perring
Earth Sciences
The partitioning of reactive nitrogen (NOy was measured over the remote North Pacific during spring 2006. Aircraft observations of NO, NO2, total peroxy nitrates (ΣPNs), total alkyl and multi-functional nitrates (ΣANs) and nitric acid (HNO3, made between 25° and 55° N, confirm a controlling role for peroxyacyl nitrates in NOx production in aged Asian outflow. ΣPNs account for more than 60% of NOy above 5 km, while thermal dissociation limits their contribution to less than 10% in the lower troposphere. Using simultaneous observations of NOx, ΣPNs, ΣANs, HNO3 and average …
2012-13 Faculty Senate - April 15, 2013 Minutes Summary, Faculty Senate
2012-13 Faculty Senate - April 15, 2013 Minutes Summary, Faculty Senate
Faculty Senate Agendas & Minutes
No abstract provided.
Satellite-Derived Bathymetry A Reconnaissance Tool For Hydrography, Shachak Pe'eri, Chukwuma Azuike, Christopher Parrish
Satellite-Derived Bathymetry A Reconnaissance Tool For Hydrography, Shachak Pe'eri, Chukwuma Azuike, Christopher Parrish
Center for Coastal and Ocean Mapping
In some developing countries, the information available to plan and prioritise hydrographic surveys is typically based on visual inspection of existing nautical charts. However, due to the age of many existing charts and lack of availability of the original source data from which they were compiled (e.g., smooth sheets) this type of analysis is often quite limited. A study was conducted to evaluate the use of a satellite-derived bathymetry (SDB) procedure to map shallow-water bathymetry in a GIS environment, and to identify areas that require a new hydrographic survey. Publically available, multispectral satellite imagery and published algorithms are used to …
The New Hampshire, Vol. 102 [103], No. 41 (Apr. 5, 2013), The New Hampshire
The New Hampshire, Vol. 102 [103], No. 41 (Apr. 5, 2013), The New Hampshire
The New Hampshire Print Edition
An independent student produced newspaper from the University of New Hampshire. This volume was printed as 102, but it is the 103rd volume in the series. This was corrected in pencil.
R/V Falkor Multibeam Echosounder System Review, Jonathan Beaudoin, Paul D. Johnson, Ashton F. Flinders
R/V Falkor Multibeam Echosounder System Review, Jonathan Beaudoin, Paul D. Johnson, Ashton F. Flinders
Center for Coastal and Ocean Mapping
No abstract provided.