scholarly journals Steve G. Fancy; Daily energy budgets of caribou: a simulation approach

Rangifer ◽  
1986 ◽  
Vol 6 (2) ◽  
pp. 55
Author(s):  
Sven Skjenneberg (ed.)
Keyword(s):  
Energy Budgets ◽  
Simulation Approach ◽  
Daily Energy ◽  
The University

S.G. Fancy successfully defended his Ph.D. Thesis, «Daily energy budgets of caribou: a simulation approach», at the University of Alaska, Fairbanks, on March 12, 1986.

scholarly journals Development and Results from Application of PCM-Based Storage Tanks in a Solar Thermal Comfort System of an Institutional Building—A Case Study

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3877 ◽  
Author(s):  
F. Javier Batlles ◽  
Bartosz Gil ◽  
Svetlana Ushak ◽  
Jacek Kasperski ◽  
Marcos Luján ◽  
...  
Keyword(s):  
Phase Change Materials ◽  
Exergy Analysis ◽  
Heating System ◽  
Storage Tanks ◽  
Research Groups ◽  
Energy Research ◽  
Solar Cooling ◽  
Daily Energy ◽  
The University

An important element of a solar installation is the storage tank. When properly selected and operated, it can bring numerous benefits. The presented research relates to a project that is implemented at the Solar Energy Research Center of the University of Almeria in Spain. In order to improve the operation of the solar cooling and heating system of the Center, it was upgraded with two newly designed storage tanks filled with phase change materials (PCM). As a result of design works, commercial material S10 was selected for the accumulation of cold, and S46 for the accumulation of heat, in an amount of 85% and 15%, respectively. The article presents in detail the process of selecting the PCM material, designing the installation, experimental research, and exergy analysis. Individual tasks were carried out by research groups cooperating under the PCMSOL EUROPEAN PROJECT. Results of tests conducted on the constructed installation indicate that daily energy saving when using a solar chiller with PCM tanks amounts to 40% during the cooling season.

Flexible energetics of cheetah hunting strategies provide resistance against kleptoparasitism

Science ◽  
2014 ◽  
Vol 346 (6205) ◽  
pp. 79-81 ◽  
Author(s):  
David M. Scantlebury ◽  
Michael G. L. Mills ◽  
Rory P. Wilson ◽  
John W. Wilson ◽  
Margaret E. J. Mills ◽  
...  
Keyword(s):  
Population Viability ◽  
Energy Budgets ◽  
Hunting Strategies ◽  
Direct Competition ◽  
Daily Energy ◽  
Balancing Energy ◽  
Individual Survival ◽  
Power Outputs ◽  
Wild Dogs ◽  
Increased Activity

Population viability is driven by individual survival, which in turn depends on individuals balancing energy budgets. As carnivores may function close to maximum sustained power outputs, decreased food availability or increased activity may render some populations energetically vulnerable. Prey theft may compromise energetic budgets of mesopredators, such as cheetahs and wild dogs, which are susceptible to competition from larger carnivores. We show that daily energy expenditure (DEE) of cheetahs was similar to size-based predictions and positively related to distance traveled. Theft at 25% only requires cheetahs to hunt for an extra 1.1 hour per day, increasing DEE by just 12%. Therefore, not all mesopredators are energetically constrained by direct competition. Other factors that increase DEE, such as those that increase travel, may be more important for population viability.

Estimating Land Surface Energy Budgets From Space: Review and Current Efforts at the University of Wisconsin—Madison and USDA–ARS

2004 ◽  
Vol 85 (1) ◽  
pp. 65-78 ◽  
Author(s):  
George R. Diak ◽  
John R. Mecikalski ◽  
Martha C. Anderson ◽  
John M. Norman ◽  
William P. Kustas ◽  
...  
Keyword(s):  
Surface Energy ◽  
Land Surface ◽  
Research Effort ◽  
Surface Fluxes ◽  
Integrated System ◽  
Energy Budgets ◽  
University Of Wisconsin ◽  
The University ◽  
Meteorological Satellite ◽  
Large Research

Since the advent of the meteorological satellite, a large research effort within the community of earth scientists has been directed at assessing the components of the land surface energy balance from space. The development of these techniques from first efforts to the present time are reviewed, and the integrated system used to estimate the radiative and turbulent land surface fluxes is described. This system is now running in real time over the continental United States at a resolution of 10 km, producing daily and time-integrated flux components.

Winter energy expenditure and the distribution of southern flying squirrels

1991 ◽  
Vol 69 (10) ◽  
pp. 2548-2555 ◽  
Author(s):  
Paul Stapp ◽  
Peter J. Pekins ◽  
William W. Mautz
Keyword(s):  
Energy Expenditure ◽  
Heat Loss ◽  
Current Distribution ◽  
Basal Metabolism ◽  
Energy Budgets ◽  
Late Winter ◽  
Daily Energy Expenditure ◽  
Flying Squirrels ◽  
Tree Cavities ◽  
Daily Energy

The southern flying squirrel (Glaucomys volans) forms large aggregations inside nest-lined tree cavities to reduce exposure to winter temperatures. We measured oxygen consumption of individuals and grouped flying squirrels in Plexiglas and nest-box chambers in New Hampshire to determine savings provided by huddling and nest construction. Because G. volans breeds during late winter, we also measured energy expenditure of females during gestation and lactation. These data were used to construct daily energy budgets for flying squirrels during winter and to investigate the relationship between this species' cold tolerance and its current distribution. Flying squirrels had lower basal metabolism (0.95 cm3 O2∙g−1∙h−1) and rate of heat loss (0.11 cm3 O2∙g−1∙h−1∙ °C−1) than predicted according to mass. Peak reproductive costs (1 week postparturition) were 170% of nonbreeding requirements. At 9 °C, huddling in groups of three and six reduced energy expenditure by 27 and 36%, respectively. Compared with individuals without nests, nest insulation decreased heat loss by 37% for single squirrels and reduced lower critical temperature from 26.5 to 12.2 °C for groups of six. As estimated from our budget, aggregating reduces winter daily energy expenditure by 26–33%. At the northern range boundary, daily expenditure for squirrels using both aggregations and nests (2.5 times basal metabolism) and for females during peak lactation (3.9 times basal metabolism) was similar to estimates of maximal daily energy expenditure in the literature. We speculate that additional thermoregulatory costs and the decreased abundance of hard mast for winter caches prevent G. volans from occupying areas north of its current distribution.

Daily Energy Budgets in Environmental Fluids

1965 ◽  
Vol 27 (5) ◽  
pp. 363-370
Author(s):  
Jacob Verduin
Keyword(s):  
Energy Budgets ◽  
Daily Energy

scholarly journals Daily Energy Budgets of Avian Embryos: The Paradox of the Plateau Phase in Egg Metabolic Rate

1998 ◽  
Vol 71 (2) ◽  
pp. 147-156 ◽  
Author(s):  
Maurine W. Dietz ◽  
Meep van Kampen ◽  
Marcel J. M. van Griensven ◽  
Sijmen van Mourik
Keyword(s):  
Metabolic Rate ◽  
Energy Budgets ◽  
Plateau Phase ◽  
Avian Embryos ◽  
Daily Energy

scholarly journals Nocturnal torpor by superb fairy-wrens: a key mechanism for reducing winter daily energy expenditure

2019 ◽  
Vol 15 (6) ◽  
pp. 20190211 ◽  
Author(s):  
Alex B. Romano ◽  
Anthony Hunt ◽  
Justin A. Welbergen ◽  
Christopher Turbill
Keyword(s):  
Energy Expenditure ◽  
Resting Metabolic Rate ◽  
Resting Energy Expenditure ◽  
Active Phase ◽  
High Mass ◽  
Energy Budgets ◽  
Specific Rate ◽  
Free Living ◽  
Daily Energy ◽  
Malurus Cyaneus

Many passerine birds are small and require a high mass-specific rate of resting energy expenditure, especially in the cold. The energetics of thermoregulation is, therefore, an important aspect of their ecology, yet few studies have quantified thermoregulatory patterns in wild passerines. We used miniature telemetry to record the skin temperature ( T skin ) of free-living superb fairy-wrens ( Malurus cyaneus , 8.6 g; n = 6 birds over N = 7–22 days) and determine the importance of controlled reductions in body temperature during resting to their winter energy budgets. Fairy-wrens routinely exhibited large daily fluctuations in T skin between maxima of 41.9 ± 0.6°C and minima of 30.4 ± 0.7°C, with overall individual minima of 27.4 ± 1.1°C (maximum daily range: 14.7 ± 0.9°C). These results provide strong evidence of nocturnal torpor in this small passerine, which we calculated to provide a 42% reduction in resting metabolic rate at a T a of 5°C compared to active-phase T skin . A capacity for energy-saving torpor has important consequences for understanding the behaviour and life-history ecology of superb fairy-wrens. Moreover, our novel field data suggest that torpor could be more widespread and important than previously thought within passerines, the most diverse order of birds.

Diving costs as a component of daily energy budgets of aquatic birds and mammals: generalizing the inclusion of dive-recovery costs demonstrated in tufted ducks

1996 ◽  
Vol 74 (12) ◽  
pp. 2131-2142 ◽  
Author(s):  
Joep J. de Leeuw
Keyword(s):  
Metabolic Rate ◽  
Energy Budgets ◽  
Energy Costs ◽  
Doubly Labelled Water ◽  
Usual Practice ◽  
Tufted Duck ◽  
Allometric Relations ◽  
Metabolic Costs ◽  
Daily Energy ◽  
Different Types

Metabolic studies on freely diving birds and mammals are reviewed and allometric relations of diving costs are presented. A distinction can be made between three different types of diving costs: (1) metabolic rate during submergence, relevant in estimating aerobic dive limits, (2) average metabolic rate during diving and breathing intervals (MRd), and (3) diving costs as the excess over resting costs (EDC). EDC is the most comprehensive measure, integrating energy costs over entire dive series with subsequent longer term recovery from heat loss or anaerobic metabolism. Respirometry experiments with tufted duck (Aythya fuligula) diving in a 5.7 m deep indoor tank demonstrated that in this species diving costs, expressed as EDC, increased at lower water temperatures. MRd was not significantly related to temperature, and probably reflects only the hydrodynamic and not the thermoregulatory component of diving costs. In general, the usual practice of measuring metabolic costs only during diving activity seems insufficient to estimate the total costs of diving. Studies that include longer term recovery (e.g., doubly labelled water measurements over entire foraging trips) yield more complete estimates of diving costs. To take diving costs into account in an animal's energy budget, estimates of EDC are more appropriate than MRd.

scholarly journals Kesuksesan Knowledge Transfer Di Laboratorium Perguruan Tinggi Melalui Pengelompokkan Rekan Kerja Menggunakan Agent-Based Modeling And Simulation

2018 ◽  
Vol 19 (2) ◽  
pp. 205
Author(s):  
Fadillah Ramadhan ◽  
Afrin Fauzya Rizana ◽  
Rispianda Rispianda ◽  
Yoanita Yuniati
Keyword(s):  
Knowledge Transfer ◽  
Modeling And Simulation ◽  
Agent Based Modeling ◽  
Simulation Approach ◽  
Agent Based ◽  
Social Agent ◽  
Adaptive Process ◽  
The Social ◽  
The University ◽  
University Laboratory

One of aspect that contributes to improving organizations performance is knowledge transfer effectiveness. On the other hand, knowledge transfer is a dynamic interaction between people, process, and environment so that activity related to knowledge transfer categorized as a complex and adaptive process. The use of agent-based modeling and simulation approach is very appropriate in modeling knowledge transfer due to its ability to deal with the dynamic, complex, and adaptive process. Moreover, the agent-based approach has the ability in describing the interaction between the social agent that possess particular behavior. The purposes of this study are to identify the factors that influence the success of knowledge transfer in the university laboratory. In addition, the results show that agent-based modeling and simulation approach can determine the best scenario that can increase the success of knowledge transfer based on grouping of colleagues.

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