In this paper, the description and results of simulation experiments investigating buffer allocation in closed serial production lines are presented. The production lines studied consist of either reliable or unreliable workstations, and have asynchronous movement of jobs. The experimental results are used to demonstrate a buffer allocation decomposition result for...
Quality concerns drive many water studies and practices, but obtaining samples from water bodies over time and space for quality determination is often difficult and expensive. We present a low-cost approach that allows integration of water samples over timescales of days to months to allow more widely distributed acquisition of...
Solutions to the Boussinesq equation describing drainage into a fully penetrating channel have been used for aquifer characterization. Two analytical solutions exist for early- and late-time drainage from a saturated, homogeneous, and horizontal aquifer following instantaneous drawdown. The solutions for discharge Q can be expressed as dQ/dt = −aQ [superscript...
The method of recession analysis proposed by Brutsaert and Nieber (1977) remains one of the few analytical tools for estimating aquifer hydraulic parameters at the field scale and beyond. In the method, the recession hydrograph is examined as −dQ/dt = f(Q), where Q is aquifer discharge and f is an...
Case history analysis, cross spectra and multiple regression analysis have been used in a study of low-pass filtered sea level records from the Pacific mainland coast of Mexico in 1971 and 1973–75. During the summer-fall season (May–October), sea level variability is characterized by strong alongshore coherence and nondispersive, poleward phase...
We construct an extratropical reduced temperature–depth profile for land areas north
of 20°N latitude from the global borehole temperature database compiled for climate
reconstruction. The mean reduced temperature profile compares well with a time series
constructed from an initial baseline temperature (0.6° ± 0.1°C) and the last 140 years
of...
Temperature profiles from boreholes on the Colorado Plateau of southeastern Utah have been examined for evidence of climate change. Because these boreholes penetrate layered sedimentary rocks with different thermal conductivities, Bullard plots (temperature versus integrated thermal resistance) are used to estimate background heat flow and surface temperature intercepts. Reduced temperatures,...
Long-period ground surface temperature variations contained in borehole
temperature-depth profiles form a complementary climate change record to high-frequency,
but noisy surface air temperature (SAT) records at weather stations. We illustrate the
benefits of jointly analyzing geothermal and meteorological data for two regions in Utah
where both high-quality temperature-depth measurements and...
Temperature profiles from boreholes on the Colorado Plateau of southeastern Utah
have been examined for evidence of climate change. Because these boreholes penetrate layered
sedimentary rocks with different thermal conductivities, Bullard plots (Temperature versus
integrated thermal resistance) are used to estimate background heat flow and surface temperature
intercepts. Reduced temperatures,...