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...

Mathematical models have become the target of numerous attempts to obtain results that can be extrapolated to the study of hydraulic pressure infrastructures associated with different engineering requests. Simulation analysis based on finite element method (FEM) models are used to determine the vulnerability of hydraulic systems under different types of actions (e.g., natural events and pressur...

Multiphase flows are commonly encountered in oil and gas industries. The transport of multiphase flow causes the formation of slug, the increase of pressure drop and the possibility of phase changes therefore, a set of simulation runs was performed to predict flow regimes in a horizontal pipeline, and the results were compared with the Baker chart. The effects of small downward inclinations of ...

This paper presents design and simulation results of two high-performance asynchronous pipeline circuits. The rst circuit is a two-phase micropipeline but uses pseudo-static Svensson-style double edge-triggered Dipops (DETDFF) for data storage in place of traditional transmission gate latches or Sutherland's capture-pass latches. The second circuit is a fourphase micropipeline with burst-mode c...

The occurrence of the severe slugging phenomenon in multiphase pipelines can cause serious and troublesome operational problems within the receiving process facilities. This paper describes: the pipeline operability studies on the Dunbar to Alwyn multiphase pipeline regarding riser-induced severe slugging; the control scheme selected to prevent this phenomenon; and the subsequent operating expe...

results under the above chromatography condition, biuret compound (peqb) and the internal standard were detected at 4.5 and 13.5 minutes, respectively. limit of quantitation of the peqb was 0.1 µg/ml. accuracy of the method over the concentration range of 0.1-100 µg/ml was between 88-109%. inter- and intraday precisions were 4-19% and 6-8%, respectively. a good relationship in the form of a pow...

background: this study was aimed to investigate the association of consuming white rice and potato, as well as the bread type with anthropometric measures and blood pressure (bp) in a national sample of iranian children and adolescents. methods: this nationwide study was conducted in 2011-2012 among 14,880 students, aged 6-18 years, selected by multistage cluster sampling from 30 provinces of i...

conclusions examination of the fasting lipid profile has clinical importance in predicting the efficacy of peg-ifn-α-2b plus rbv combination therapy for patients with hcv g1b even after the discovery of the il28 genotype as a potent predictive factor. objectives to re-examine the significance of lipoprotein profiles on virological response to peg-ifn plus rbv combination therapy in patients wit...