616 research outputs found
IDENTIFICATION OF NATURAL ATTENUATION OF TRICHLOROETHENE AND TECHNETIUM-99 ALONG LITTLE BAYOU CREEK, McCRACKEN COUNTY, KENTUCKY
Natural attenuation of trichloroethene (TCE) and technetium (99Tc) was studied for five consecutive seasons (from January 2002 to January 2003) in Little Bayou Creek. The stream receives ground water discharge from an aquifer contaminated by past waste disposal activities at the Paducah Gaseous Diffusion Plant (PGDP), a uranium enrichment facility near Paducah, Kentucky. Results from stream gaging, contaminant monitoring, tracer tests (with bromide, nitrate, rhodamine WT and propane) and simulation modeling indicate the TCE is naturally attenuated by volatilization and dilution, with volatilization rates related to the ambient temperature and surface discharge rate. The only apparent mechanism of 99Tc attenuation is dilution. Travel times of non-gaseous tracers were found to be similar and have highest values in October and lowest in June. It was also estimated from modeling that the transport of the solutes in the stream was mostly one-dimensional with insignificant secondary storage
DEEPER GROUNDWATER FLOW AND CHEMISTRY IN THE ARSENIC AFFECTED WESTERN BENGAL BASIN, WEST BENGAL, INDIA
Natural attenuation of trichloroethene (TCE) and technetium (99Tc) was studied for five consecutive seasons (from January 2002 to January 2003) in Little Bayou Creek. The stream receives ground water discharge from an aquifer contaminated by past waste disposal activities at the Paducah Gaseous Diffusion Plant (PGDP), a uranium enrichment facility near Paducah, Kentucky. Results from stream gaging, contaminant monitoring, tracer tests (with bromide, nitrate, rhodamine WT and propane) and simulation modeling indicate the TCE is naturally attenuated by volatilization and dilution, with volatilization rates related to the ambient temperature and surface discharge rate. The only apparent mechanism of 99Tc attenuation is dilution. Travel times of non-gaseous tracers were found to be similar and have highest values in October and lowest in June. It was also estimated from modeling that the transport of the solutes in the stream was mostly one-dimensional with insignificant secondary storage
Biogeography-based algorithm for high voltage electrode surface optimization of a single-phase GIS bus terminal
A new method applying the biogeography-based optimization (BBO) technique is
presented for the optimization of high voltage electrode surfaces. The aim is
to obtain the optimization of the electrode shape in order to achieve a
uniform field distribution along the surface of the electrode and maintain
maximum field stress at minimum value. The principle of the developed
optimization technique is described with an axi-symmetric single-phase GIS
bus terminal electrode considered as a quarter-ellipse. In this scheme
different aspects of the optimization technique are compared by means of
semi-infinite line charges and ring charges to compute the electric field
with the charge simulation method (CSM). The new Biogeography Based optimized
approach helps in achieving a uniform field distribution with a minimum
electric stress on the electrode surface and a minimum deviation angle for
the otherwise normal stress vector, holding the assignment factor within the
assigned range. The deviation angle is the more sensitive indicator of the
simulation accuracy .The assignment factor has an impact on simulation
accuracy. The combined BBO/CSM algorithm is capable of finding a
better-quality solution, better accuracy, better convergence characteristics
and computational efficiency
Nonlinear differential polynomials sharing a small function
summary:Dealing with a question of Lahiri [6] we study the uniqueness problem of meromorphic functions concerning two nonlinear differential polynomials sharing a small function. Our results will not only improve and supplement the results of Lin-Yi [16], Lahiri Sarkar [12] but also improve and supplement a very recent result of the first author [1]
Recent Advancement in 3D Biometrics using Monocular Camera
Recent literature has witnessed significant interest towards 3D biometrics
employing monocular vision for robust authentication methods. Motivated by
this, in this work we seek to provide insight on recent development in the area
of 3D biometrics employing monocular vision. We present the similarity and
dissimilarity of 3D monocular biometrics and classical biometrics, listing the
strengths and challenges. Further, we provide an overview of recent techniques
in 3D biometrics with monocular vision, as well as application systems adopted
by the industry. Finally, we discuss open research problems in this area of
researchComment: Accepted and presented in IJCB 202
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