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Showing 1 to 20 of 58 for “"transmissivity"”.
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Estimating Transmissivity From the Water Level Fluctuations of a Sinusoidally Forced Well
… and damping ratios were determined, and transmissivity was estimated. These data were also analyzed with the frequency domain approach of Rojstaczer (1988). The estimates of T determined using nonlinear regression, time series analysis, and Rojstaczer (1988) were consistent in the …
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Temperature effect of phase transition radiation of water
… Experiments and computer simulations of transmissivity tests as well as results discussion are performed in this study. A mixture of liquid and vapor water is generated while letting IR radiation at 3.1-4.95 passing through. A detector is used to measure photon counts serving as radiation …
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The Effects of Degraded Vision and Automatic Combat Identification Reliability on Infantry Friendly Fire Engagements
… while wearing goggles with various levels of transmissivity and shooting an M16A2 containing a combat identification system operating at 100% and 60% reliability. As expected, there was a significant main effect of Transmissivity Level [F(2, 22) = 8.168, p = 0.002] and Combat Identification …
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Modeling and algorithms for optimizing beam steering optical crossconnects
… of the mirror tilt angles to optimize the transmissivity through each possible input/output pair. The result from the fine-tuning process that produces optimization at one point in time, however, does not guarantee optimization for future attempts. This thesis models the transmissivity as a …
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Changes of some optical constants of thin metallic films due to exposure to gases
The reflectivity, transmissivity, and absorptivity of freshly evaporated silver and copper films were measured in vacuo and then in the presence of several gases. These measurements were performed, using the photoelectric method, with two photomultiplier tubes (931-A and 1P21), and were made at an …
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Characterization of the hydrostratigraphic units of the Sodwana area using the electrical resistivity method
… of 50Ωm - 120Ωm and was interpreted as the low transmissivity Kosi Bay/Isipingo Formations. The fourth layer had a resistivity range of 10Ωm - 50Ωm and was interpreted as the deeper aquifer unit of the Uloa Formation. The basement Cretaceous rock formed the fifth layer that showed a clear …
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An Unsteady State Tracer Dilution Method for Characterizing Water Contributing Fractures in Crystalline Bedrock Wells
… water contributing fractures, calculate their transmissivity values, determine their hydraulic heads, determine ambient flow conditions, and calculate contaminant concentration within the fractures. This method was tested on a large physical model well and a bedrock well. The model well was …
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Using Ground Penetrating Radar Signal Reflection to Model a Highly Transmissive Bedrock Aquifer
… the spatial variability of the hydraulic transmissivity using the attenuation of the ground penetrating radar (GPR) signal.</p> <p>Slug tests were performed in ten bedrock wells, located within and surrounding a highly conductive zone. The transmissivities measured in these wells ranged …
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Optical properties and surface activities of thin metallic films deposited in ultra high vacua
… lower. Their optical properties, reflectivity, transmissivity and absorptivity, were determined in vacua and in air by direct measurement using photomultiplier tubes. All the measurements were made at nearly normal incidence with a monochromatic light beam of wavelength 4358 A. It was found that …
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Modelo de simulação com base na Teoria de Sistemas Lineares para avaliação de recursos hídricos subterrâneos
… evaluation of an aquifer is presented in which transmissivity is not used as an input. The present technique avoids expensive field tests to determine this parameters that is compulsory when other techniques are used. The model is also advantageous in respect to its formulation, calibration and …
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Experimental investigations of solid-solid thermal interface conductance
… captured by current models of phonon transmissivity. The first study considers interfaces of different metals with graphite, and finds that atomic-scale roughness at the interface could be appreciably influencing the heat transport due to the extreme anisotropy of graphite. The thermal …
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Measurements and modelling of reflection and transmission from smooth and rough surfaces at 62 GHz
… interpretation of the reflectivity, scatter and transmissivity measurements performed on different materials.<br/><br/>Reflectivity and transmissivity measurements at 62.4 GHz have been made inside the anechoic chamber on eight different building materials, and results are expressed as functions …
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Nanostructured multifunctional materials for control of light transport and surface wettability
… for enhanced omnidirectional broadband transmissivity in conjunction with structural superhydrophilicity or robust superhydrophobicity. This is achieved through a systematic approach to concurrent design of nanostructures in both domains and an innovative fabrication procedure that …
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Performance assessment of capture zones generated by PV-powered pump and treat systems
… U.S. as a function of solar insolation data, transmissivity, and hydraulic gradient was developed. Maps depicting predicted capture zone widths for specified transmissivity values and a hydraulic gradient were developed. The applicability of the developed methodology was illustrated with two …
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Inferring subglacial hydrology from investigations of supraglacial lake drainages and meltwater plumes at Store Glacier, West Greenland
… an efficient system, experiencing fast hydraulic transmissivity, while elevations above 1000 m still experienced slow hydraulic transmissivity in a distributed drainage system. This research provides high-detail observations of the unique subglacial drainage system of a tidewater glacier. …
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Characterization of a hydraulically induced bedrock fracture
… and tracer testing is used to estimate the transmissivity and storage coefficient of a hydraulically induced fracture and observe its behavior as a contaminant flow pathway. The results of the aquifer tests indicated a decrease in both the transmissivity and storage coefficient of the …
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Hydrogeological characterisation and water supply potential of Lebalelo South, Limpopo Province of South Africa
… and interpreted using AQTESOLVE. Aquifer transmissivity, storativity, internal and external hydraulic boundaries were determined from the data. The transmissivity in the area ranges from 0.08 to 124.7 m2/day. The aquifer types in the area are double porosity aquifer, radial flow aquifer …
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Impact of uncertain input on parameter estimation in groundwater model
… When important hydrogeological parameters like transmissivity and storativity are estimated using regression-based inverse methods, it is assumed that all other parameters and quantities are known. In particular, it is assumed that pumping rates are known. This will not be a valid assumption for …
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A method using drawdown derivatives to estimate aquifer properties near active groundwater production well fields
… drawdown derivatives to estimate the aquifer transmissivity and storativity. The forward model consists of an initial water level (or a recoverable water level drift function), an analytical solution for aquifer drawdown, and a correction term for well loss. The aquifer drawdown component is …
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Hydrogeological investigation of the Naukluft mountains, southwest Namibia
… Park office, Zais and Solitaire to estimate transmissivity. Results indicate that transmissivity ranges from 4.1 to 23.1 m2/d. storage coefficient was not estimated due to lack of piezometers during test pumping. The main groundwater flow is oriented along surface water drainages to the …
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