Some pressure sensor placement methods for leak detection and location in water distribution networks are based on the pressure sensitivity matrix analysis. This matrix depends on the network demands, which are nondeterministic, and the leak magnitudes, which are unknown. In this paper, the robustness of a sensor placement methodology against the fault sensitivity matrix uncertainty is studied....

For gas transportation through pipes in normal and emergency modes, a comparison of calculations based on mathematical models various degrees generality is presented. A model non-isothermal steady flow mixture gases its simplified versions are studied. options, simple analytical dependencies were obtained for calculating characteristics the location an leak. Examples pressure distributions, tem...

Inverse Transient Analysis (ITA) is a powerful approach for leak detection of pipelines. When the pipe transient flow is analyzed in frequency domain the ITA is called Inverse Frequency Response Analysis (IFRA). To implement an IFRA for leak detection, a transient state is initiated in the pipe by fast closure of the downstream end valve. Then, the pressure time history at the valve location is...

Hepatobiliary scintigraphy is a sensitive method for intra & extera hepatic bile leak diagnosis. Bile lead may be seen after hepatobiliary surgery, trauma, inflammatory disease or malignant neoplasms. Although sonography and CT scanning are useful for diagnosis of peritoneal or perihepatic fluid, they cannot prove bile ascites. Hepatobiliary scintigraphy with Tc-99m-IDA agents is a physio...

Functional programming is largely untested in the industrial environment. This paper summarises the results of a study into the suitability of Haskell in the area of text compression, an area with deenite commercial interest. Our program initially performs very poorly in comparison with a version written in C. Experiments reveal the cause of this to be the large disparity in the relative speed ...

hepatobiliary scintigraphy is a sensitive method for intra & extera hepatic bile leak diagnosis. bile lead may be seen after hepatobiliary surgery, trauma, inflammatory disease or malignant neoplasms. although sonography and ct scanning are useful for diagnosis of peritoneal or perihepatic fluid, they cannot prove bile ascites. hepatobiliary scintigraphy with tc-99m-ida agents is a physiolo...

In the Oil & Gas pipeline leak detection market today, there are several software based methodologies available – ranging from simplistic pressure wave methods, to real-time model-based volume balance techniques. All approaches have inherent advantages and disadvantages, defi nable in terms of simplicity of implementation/maintenance needs, reliability, cost, robustness, availability, and accur...