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Articles 11341 - 11370 of 15587
Full-Text Articles in Physical Sciences and Mathematics
Seasonal Aeration Rates For The Eastern United States Based On Long-Term Weather Patterns, Michael D. Montross, Samuel G. Mcneill, Thomas C. Bridges
Seasonal Aeration Rates For The Eastern United States Based On Long-Term Weather Patterns, Michael D. Montross, Samuel G. Mcneill, Thomas C. Bridges
Biosystems and Agricultural Engineering Faculty Publications
Most aeration fans are sized to produce a minimum airflow rate of 0.1 m3/min/t (0.1 cfm/bu) in on-farm grain storage structures. At this airflow rate a significant amount of time is required to move a cooling front completely through a bin. The desired grain temperature and prevailing weather conditions will have a significant effect on required fan size. Thirty years of weather data were analyzed for the eastern United States to determine the amount of time available in temperature windows between 0 to 15.C and 0 to 17.C. Contour maps were generated with ArcMap 8.3 for the percentage …
Illinois River 2003 Pollutant Loads At Arkansas Highway 59 Bridge, Marc A. Nelson, L. Wade Cash
Illinois River 2003 Pollutant Loads At Arkansas Highway 59 Bridge, Marc A. Nelson, L. Wade Cash
Technical Reports
Automatic water samplers and a U. S. Geological Survey gauging station were established in 1995 on the main stem of the Illinois River at the Arkansas Highway 59 Bridge. Since that time, continuous stage and discharge measurements and water quality sampling have been used to determine pollutant concentrations and loads in the Arkansas portion of the Illinois River. This report represents the results from the measurement and sampling by the Arkansas Water Resources Center -Water Quality Lab for January 1, 2003 to December 31, 2003.
2003 Pollutant Loads Kings River Near Berryville, Arkansas, Marc A. Nelson, L. Wade Cash
2003 Pollutant Loads Kings River Near Berryville, Arkansas, Marc A. Nelson, L. Wade Cash
Technical Reports
An automatic sampler and a USGS gauging station were established in 1998 and water quality sampling was begun in 1999 on the Kings River near Berryville, Arkansas. Continuous stage and discharge measurements and frequent water quality sampling have been used to determine pollutant concentrations and loads in the river. This report presents the results from the sampling and analysis for January 1, 2003 to December 31, 2003.
Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Washington County Road 76 Bridge On Ballard Creek, Marc A. Nelson, L. Wade Cash, G. Keith Trost
Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Washington County Road 76 Bridge On Ballard Creek, Marc A. Nelson, L. Wade Cash, G. Keith Trost
Technical Reports
The Illinois River Basin has experienced water quality impairment from non-point source pollution for many years. This fact was well documented in the State of Arkansas' Water Quality Assessment report, the Soil Conservation Service River Basin Study, and several University of Arkansas, Fayetteville studies. Thirty-seven sub-watersheds have been identified by the SCS in the Arkansas portion of the Illinois River basin. In the Arkansas portion of the Basin, the Illinois River, Evansville Creek, Baron Fork, Cincinnati Creek, Muddy Fork, Moores Creek, Clear Creek, Osage Creek and Flint Creek were all classified as not supporting their designated use as primary contact …
Water Quality Monitoring Of Moores Creek Above Lincoln Lake 2003, Marc A. Nelson, L. Wade Cash, G. Keith Trost
Water Quality Monitoring Of Moores Creek Above Lincoln Lake 2003, Marc A. Nelson, L. Wade Cash, G. Keith Trost
Technical Reports
No abstract provided.
A Nonparametric Method For Separating Photosynthesis And Respiration Components In Co2 Flux Measurements, Chuixiang Yi, Runze Li, Peter S. Backwin, Ankur Desai, Daniel M. Ricciuto, Sean P. Burns, Andrew A. Turnipseed, Steven C. Wofsy, J. William Munger, Kell Wilson, Russell K. Monson
A Nonparametric Method For Separating Photosynthesis And Respiration Components In Co2 Flux Measurements, Chuixiang Yi, Runze Li, Peter S. Backwin, Ankur Desai, Daniel M. Ricciuto, Sean P. Burns, Andrew A. Turnipseed, Steven C. Wofsy, J. William Munger, Kell Wilson, Russell K. Monson
Publications and Research
Future climate change is expected to affect ecosystem-atmosphere CO2 exchange, particularly through the influence of temperature. To date, however, few studies have shown that differences in the response of net ecosystem CO2 exchange (NEE) to temperature among ecosystems can be explained by differences in the photosynthetic and respiratory processes that compose NEE. Using a new nonparametric statistical model, we analyzed data from four forest ecosystems. We observed that differences among forests in their ability to assimilate CO2 as a function of temperature were attributable to consistent differences in the temperature dependence of photosynthesis and respiration. This observation …
Report On The Oregon Ballast Water Management Program In 2004, Kiirsten Flynn, Mark Sytsma
Report On The Oregon Ballast Water Management Program In 2004, Kiirsten Flynn, Mark Sytsma
Center for Lakes and Reservoirs Publications and Presentations
This report was prepared for the Oregon legislature pursuant to HB 3620, which was passed during the 2003 session of the Oregon legislature to address management of ballast water discharged from ships. The bill removed sediment from the definition of ballast water, allowed discharge of treated ballast water, created a task force on ballast water management, and required this report. Includes List of Acronyms, charts, graphs and maps.
Measurement Of In Situ Acoustic Properties For The Onr Geoclutter Program, Larry A. Mayer, Barbara J. Kraft, Luciano E. Fonseca
Measurement Of In Situ Acoustic Properties For The Onr Geoclutter Program, Larry A. Mayer, Barbara J. Kraft, Luciano E. Fonseca
Center for Coastal and Ocean Mapping
No abstract provided.
Evaluating Spatial Variability Of Precipitation In Kentucky With Exploratory Data Analysis, Daniel Taylor
Evaluating Spatial Variability Of Precipitation In Kentucky With Exploratory Data Analysis, Daniel Taylor
Masters Theses & Specialist Projects
Spatial variability of precipitation is examined over the state of Kentucky and surrounding areas. The study focuses on the analysis of monthly precipitation totals from the period of 1961-2000. The purpose of the study is to develop a set of indices to represent the spatial variability of the study area for a given month. Various exploratory data analysis methods such as variography, kriging, and cluster analysis were used. The study attempts to quantify the second order (local) effects of the spatial variation of precipitation as a means to provide insight into the prediction of precipitation randomness. This task can be …
How A Mirage Is Formed, Christopher Roman
How A Mirage Is Formed, Christopher Roman
Christopher N. Roman
Article that appeared in Sail magazine (ISSN: 0036-2700).
Intercomparisons Of Airborne Measurements Of Aerosol Ionic Chemical Composition During Trace-P And Ace-Asia, Y Ma, R J. Weber, K Maxwell-Meier, D A. Orsini, Y-N Lee, B J. Huebert, S G. Howell, T H. Bertram, R. Talbot, Jack E. Dibb, Eric Scheuer
Intercomparisons Of Airborne Measurements Of Aerosol Ionic Chemical Composition During Trace-P And Ace-Asia, Y Ma, R J. Weber, K Maxwell-Meier, D A. Orsini, Y-N Lee, B J. Huebert, S G. Howell, T H. Bertram, R. Talbot, Jack E. Dibb, Eric Scheuer
Earth Sciences
As part of the two field studies, Transport and Chemical Evolution over the Pacific (TRACE-P) and the Asian Aerosol Characterization Experiment (ACE-Asia), the inorganic chemical composition of tropospheric aerosols was measured over the western Pacific from three separate aircraft using various methods. Comparisons are made between the rapid online techniques of the particle into liquid sampler (PILS) for measurement of a suite of fine particle a mist chamber/ion chromatograph (MC/IC) measurement of fine sulfate, and the longer time-integrated filter and micro-orifice impactor (MOI) measurements. Comparisons between identical PILS on two separate aircraft flying in formation showed that they were highly …
A Comparison Of Similar Aerosol Measurements Made On The Nasa P3-B, Dc-8, And Nsf C-130 Aircraft During Trace-P And Ace-Asia, K G. Moore, A D. Clarke, V Kapustin, Cameron Mcnaughton, B E. Anderson, E L. Winstead, R J. Weber, Y Ma, Y N. Lee, R. Talbot, Jack E. Dibb, T Anderson, S Dougherty, D Covert, D Rogers
A Comparison Of Similar Aerosol Measurements Made On The Nasa P3-B, Dc-8, And Nsf C-130 Aircraft During Trace-P And Ace-Asia, K G. Moore, A D. Clarke, V Kapustin, Cameron Mcnaughton, B E. Anderson, E L. Winstead, R J. Weber, Y Ma, Y N. Lee, R. Talbot, Jack E. Dibb, T Anderson, S Dougherty, D Covert, D Rogers
Earth Sciences
Two major aircraft experiments occurred off the Pacific coast of Asia during spring 2001: the NASA sponsored Transport and Chemical Evolution over the Pacific (TRACE-P) and the National Science Foundation (NSF) sponsored Aerosol Characterization Experiment-Asia (ACE-Asia). Both experiments studied emissions from the Asian continent (biomass burning, urban/industrial pollution, and dust). TRACE-P focused on trace gases and aerosol during March/April and was based primarily in Hong Kong and Yokota Air Force Base, Japan, and involved two aircraft: the NASA DC-8 and the NASA P3-B. ACE-Asia focused on aerosol and radiation during April/May and was based in Iwakuni Marine Corps Air Station, …
Carbonyl Sulfide And Carbon Disulfide: Large-Scale Distributions Over The Western Pacific And Emissions From Asia During Trace-P, Nicola J. Blake, David G. Streets, Jung -Hun Woo, Isobel J. Simpson, Jonathan Green, Simone Meinardi, Kazuyuki Kita, E L. Atlas, H Fuelberg, Glen Sachse, Melody A. Avery, S Vay, R. Talbot, Jack E. Dibb, A R. Bandy, D C. Thornton, F Sherwood Rowland, D R. Blake
Carbonyl Sulfide And Carbon Disulfide: Large-Scale Distributions Over The Western Pacific And Emissions From Asia During Trace-P, Nicola J. Blake, David G. Streets, Jung -Hun Woo, Isobel J. Simpson, Jonathan Green, Simone Meinardi, Kazuyuki Kita, E L. Atlas, H Fuelberg, Glen Sachse, Melody A. Avery, S Vay, R. Talbot, Jack E. Dibb, A R. Bandy, D C. Thornton, F Sherwood Rowland, D R. Blake
Earth Sciences
An extensive set of carbonyl sulfide (OCS) and carbon disulfide (CS2) observations were made as part of the NASA Transport and Chemical Evolution over the Pacific (TRACE-P) project, which took place in the early spring 2001. TRACE-P sampling focused on the western Pacific region but in total included the geographic region 110°E to 290°E longitude, 5°N to 50°N latitude, and 0–12 km altitude. Substantial OCS and CS2 enhancements were observed for a great many air masses of Chinese and Japanese origin during TRACE-P. Over the western Pacific, mean mixing ratios of long-lived OCS and shorter-lived CS2 …
Deglacial Chronology Of The Northern Scott Coast From Relative Sea-Level Curves, Brenda Hall
Deglacial Chronology Of The Northern Scott Coast From Relative Sea-Level Curves, Brenda Hall
University of Maine Office of Research Administration: Grant Reports
This award provides support for three years for a project to develop a radiocarbon chronology for recession of grounded ice from the northwestern Ross Sea Embayment (northern Scott Coast) since the Last Glacial Maximum (LGM). A key unresolved question in Antarctic glaciology concerns the stability of the marine-based West Antarctic ice sheet (WAIS). One way to gain insight into present and future stability is to examine its past behavior. In particular, the timing of deglaciation from the LGM position on the continental shelf is critical for isolating the mechanisms (sea level, climate, ocean temperature, and internal dynamics) that control WAIS …
Seabed Auv Offers New Platform For High-Resolution Imaging, Hanumant Singh, Ali Can, Ryan Eustice, Steve Lerner, Neil Mcphee, Chris Roman
Seabed Auv Offers New Platform For High-Resolution Imaging, Hanumant Singh, Ali Can, Ryan Eustice, Steve Lerner, Neil Mcphee, Chris Roman
Graduate School of Oceanography Faculty Publications
A number of marine biological, geological, and archaeological applications share the need for high-resolution optical and acoustic imaging of the sea floor [Ballard et al., 2002; Greene et al., 2000; Shank et al., 2002]. In particular,there is a compelling need to conduct studies in depths beyond those considered reasonable for divers (∼50 m) down to depths at the shelf edge and continental slope (∼1000–2000 m). Some of the constraints associated with such work include the requirement to work off of small coastal vessels or fishing boats of opportunity,and the requirement for the vehicle components to be air-shippable to enable inexpensive …
Investigations For Ergonomic Presentation Of Ais Symbols For Ecdis, Florian Motz, Heino Widdel, Parry Oei, Scott Mackinnon, Lee Alexander
Investigations For Ergonomic Presentation Of Ais Symbols For Ecdis, Florian Motz, Heino Widdel, Parry Oei, Scott Mackinnon, Lee Alexander
Center for Coastal and Ocean Mapping
Empirical investigations were carried out in a research project for the German Federal Ministry of Transport, Building, and Housing to evaluate the presentation of AIS target information on ECDIS. The investigations were performed at three international simulation centres. The features, colour and fillingjsize of AIS symbols, as well as the influence of the ECDIS display category on the detection of AIS targets were the main issues of the investigations. Results show that blue (5-52 colour token RE5BL) is the most suitable colour of the tested colours for the presentation of AIS targets under all ambient light conditions on the tested …
Biology And Ecology Of Larval Lobsters (Homarus Americanus): Implications For Population Connectivity And Larval Transport, Eric R. Annis
Biology And Ecology Of Larval Lobsters (Homarus Americanus): Implications For Population Connectivity And Larval Transport, Eric R. Annis
Electronic Theses and Dissertations
The connectivity of marine populations and the degree to which they are considered open or closed has important implications for the ecology, management, and resilience of commercially harvested species. Larval exchange is a primary determinant of the level of connectivity between populations, and this thesis examines the intrinsic and extrinsic factors influencing larval transport and the distribution of larvae of the American lobster (Homarus americanus). The potential for larval transport is directly proportional to the planktonic larval duration. Our field data suggest development times in situ were up to three times faster than previous laboratory development times, indicating that potential …
Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Wyman Bridge On The White River, Marc Nelson, L. Wade Cash
Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Wyman Bridge On The White River, Marc Nelson, L. Wade Cash
Technical Reports
An automatic water sampler was established in 2000 on the main stem of the White River at the Wyman Road Bridge. The Quality Assurance Project Plan (QAPP) was approved by EPA Region six on April 2000 and sampling was begun at that time. This station is coordinated with a USGS gauging station at the same location. This station was instrumented to collect samples at sufficient intervals across the hydrograph to accurately estimate the flux of total suspended solids, nitrogen and phosphorus into the upper end of Beaver Lake from the White River. The Upper White was designated as the states …
Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Washigton County Road 195 Bridge On The West Fork Of The White River 2003 Annual Report, Marc Nelson, L. Wade Cash, Sandi Formica
Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Washigton County Road 195 Bridge On The West Fork Of The White River 2003 Annual Report, Marc Nelson, L. Wade Cash, Sandi Formica
Technical Reports
A water quality sampling station was installed at the Washington County road 195 bridge on the West Fork of the White River just above the confluence of the three main forks of the Upper White River in December 2001. The Quality Assurance Project Plan (QAPP) was approved by EPA Region six on March 2002 and sampling was begun at that time. This station is coordinated with a USGS gauging station at the same location. This station was instrumented to collect samples at sufficient intervals across the hydrograph to accurately estimate the flux of total suspended solids, nitrogen and phosphorus into …
Effects Of Experimental Greenhouse Warming On Phytoplankton And Zooplankton Communities In Fishless Alpine Ponds, Angela L. Strecker, Tyler P. Cobb, Rofl D, Vinebrooke
Effects Of Experimental Greenhouse Warming On Phytoplankton And Zooplankton Communities In Fishless Alpine Ponds, Angela L. Strecker, Tyler P. Cobb, Rofl D, Vinebrooke
Angela L. Strecker
The impacts of global warming on aquatic ecosystems are expected to be most pronounced at higher trophic levels in cold-water environments. Therefore, we hypothesized that wanning of fishless alpine ponds would suppress large-bodied consumers (e.g., cladocerans, copepods) and stimulate fast-growing microorganisms (e.g., phytoflagellates, rotifers), thereby altering the community composition and total abundance of zooplankton and phytoplankton. This hypothesis was tested using three blocks of four experimental mesocosms (1000-liter capacity) that were located next to alpine ponds in Banff National Park, Canada. Each block received unfiltered pond water and sediment from a pond following ice out in June 2000. A warming …
Enc Distribution Options Based On Wend, Lee Alexander
Enc Distribution Options Based On Wend, Lee Alexander
Center for Coastal and Ocean Mapping
The electronic chart is a new technology capable of continuously determining a vessel's position in relation to land, charted objects, aids-to-navigation, and unseen hazards. As a real-time navigation system, electronic charting provides significant benefits in terms of improvements in navigation safety, efficiency of maritime transportation, and marine environmental protection.
In terms of system components, features and functional capability, there are two basic types of electronic charts. The most advanced form is an Electronic Chart Display and Information System (ECDIS). All other types can be regarded, generically, as Electronic Chart Systems (ECS). For an electronic chart to be considered an ECDIS, …
The Effect Of Submarine Canyon Width And Stratification On Coastal Circulation And Across Shelf Exchange, Kyung-Hoon Hyun
The Effect Of Submarine Canyon Width And Stratification On Coastal Circulation And Across Shelf Exchange, Kyung-Hoon Hyun
OES Theses and Dissertations
A 3-D ocean circulation model is used to investigate the effect of the width of a submarine canyon and stratification on adjacent coastal circulation and across shelf exchange. Upwelling winds for 20 d drive circulation over six canyons of varying widths (8–60 km), two escarpments to represent infinitely wide canyons, and a generic shelf-slope without a canyon. Also six stratifications whose first internal Rossby radii (a) range over 2–18 km were applied to two canyons (20 and 40 km) to see the effect of stratification. All simulations adjust to the canyon after 5 days spinup and reach an …
Effects Of Experimental Greenhouse Warming On Phytoplankton And Zooplankton Communities In Fishless Alpine Ponds, Angela L. Strecker, Tyler P. Cobb, Rolf D. Vinebrooke
Effects Of Experimental Greenhouse Warming On Phytoplankton And Zooplankton Communities In Fishless Alpine Ponds, Angela L. Strecker, Tyler P. Cobb, Rolf D. Vinebrooke
Environmental Science and Management Faculty Publications and Presentations
The impacts of global warming on aquatic ecosystems are expected to be most pronounced at higher trophic levels in cold-water environments. Therefore, we hypothesized that wanning of fishless alpine ponds would suppress large-bodied consumers (e.g., cladocerans, copepods) and stimulate fast-growing microorganisms (e.g., phytoflagellates, rotifers), thereby altering the community composition and total abundance of zooplankton and phytoplankton. This hypothesis was tested using three blocks of four experimental mesocosms (1000-liter capacity) that were located next to alpine ponds in Banff National Park, Canada. Each block received unfiltered pond water and sediment from a pond following ice out in June 2000. A warming …
Wind Shear, Christopher Roman
Wind Shear, Christopher Roman
Christopher N. Roman
Article that appeared in Sail magazine (ISSN: 0036-2700).
Southeast Florida Coral Reef Evaluation And Monitoring Project 2003 Year 1 Final Report, Jennifer Wheaton, Carl Beaver, Walter Jaap, Michael Callahan, Selena Kupfner, Shannon Wade, Jim Kidney, Stopher Slade, Erin Mcdevitt, Eric Ault, Fred Voss, David S. Gilliam, B. D. Ettinger, Daniel P. Fahy, Elizabeth Glynn Fahy, Shaun M. Gill, Jamie A. Monty, Lauren F. Shuman, Brian K. Walker, Richard E. Dodge, Tim Mcintosh, Steven Blair, Kenneth Banks, Louis E. Fisher, David Stout, Joe Ligas, Janet Phipps
Southeast Florida Coral Reef Evaluation And Monitoring Project 2003 Year 1 Final Report, Jennifer Wheaton, Carl Beaver, Walter Jaap, Michael Callahan, Selena Kupfner, Shannon Wade, Jim Kidney, Stopher Slade, Erin Mcdevitt, Eric Ault, Fred Voss, David S. Gilliam, B. D. Ettinger, Daniel P. Fahy, Elizabeth Glynn Fahy, Shaun M. Gill, Jamie A. Monty, Lauren F. Shuman, Brian K. Walker, Richard E. Dodge, Tim Mcintosh, Steven Blair, Kenneth Banks, Louis E. Fisher, David Stout, Joe Ligas, Janet Phipps
Marine & Environmental Sciences Faculty Reports
No abstract provided.
Atmospheric Lidar Observatory (Alo) Ten-Year Mesospheric Temperature Climatology, Joshua P. Herron, Vincent B. Wickwar
Atmospheric Lidar Observatory (Alo) Ten-Year Mesospheric Temperature Climatology, Joshua P. Herron, Vincent B. Wickwar
Posters
The Rayleigh-scatter lidar at the Atmospheric Lidar Observatory (ALO) on the Utah State University (USU) (41.7°N, 111.8°W) campus has been in operation since 1993. The temperature database now contains over ten years of Rayleigh-scatter temperatures. A multi-year temperature climatology has been calculated from these observations along with the RMS and interannual variability. These temperatures and the climatology are currently being used in a number of mesospheric studies, including mesospheric inversion layers, tides, planetary waves, cyclical variations, trends, longitudinal comparisons, and validation studies.
Examples Of Alo Results, Vincent B. Wickwar, Joshua P. Herron, Karen M. Nelson, Troy A. Wynn, Kristina Thomas, Eric M. Lundell
Examples Of Alo Results, Vincent B. Wickwar, Joshua P. Herron, Karen M. Nelson, Troy A. Wynn, Kristina Thomas, Eric M. Lundell
Presentations
No abstract provided.
A Physiochemically Constrained Seawater Culturing System For Production Of Benthic Foraminifera, Christopher J. Hintz, G. Thomas Chandler, Jay M. Bernhardt, Daniel C. Mccorkle, Suzanne M. Havach, Jessica K. Blanks, Timothy J. Shaw
A Physiochemically Constrained Seawater Culturing System For Production Of Benthic Foraminifera, Christopher J. Hintz, G. Thomas Chandler, Jay M. Bernhardt, Daniel C. Mccorkle, Suzanne M. Havach, Jessica K. Blanks, Timothy J. Shaw
Faculty Publications
No abstract provided.
Soil Moisture As An Indicator Of Weather Extremes, Venkat Lakshmi, Thomas C. Piechota, Ujjwal Narayan, Chunling Tang
Soil Moisture As An Indicator Of Weather Extremes, Venkat Lakshmi, Thomas C. Piechota, Ujjwal Narayan, Chunling Tang
Civil and Environmental Engineering and Construction Faculty Research
In this paper, we investigate floods and droughts in the Upper Mississippi basin over a 50-year period (1950–1999) using a hydrological model (Variable Infiltration Capacity Model – 3 Layer). Simulations have been carried out between January 1950 and December 1999 at daily time-step and 1/8° spatial resolution for the water budget and at hourly time-step and 1° spatial resolution for the energy balance. This paper will provide valuable insights to the slow response components of the hydrological cycle and its diagnostic/predictive value in the case of floods and droughts. The paper compares the use of the Palmer Drought Severity Index …
Haptic Gdraw: A Fun And Easy To Use 3d Haptically Enhanced Sculpting Program, Rick Komerska, Colin Ware
Haptic Gdraw: A Fun And Easy To Use 3d Haptically Enhanced Sculpting Program, Rick Komerska, Colin Ware
Center for Coastal and Ocean Mapping
We have developed a simple haptically-enhanced 3D sculpting application which utilizes Hermite spline-based primitives as building blocks to construct more complex solid models. To accomplish this, we have constructed a VR work environment which is intuitive and whose control affordances are made clear through the use of graspable handles. Haptics is used to support handle selection and provide physical constraints on handle movements consistent with their visual affordances. Our goal is to demonstrate how relatively simple haptic force constraints can combine with a visually intuitive and compelling environment to enable a program that is fun and easy to use.