Insulating liquids have been applied to electrical insulation of transformers, circuit breakers and switch gears and have been investigated in different ways to enhance their performance. Dielectric ...liquids have been used for the transformer insulation and cooling applications since more than a century. Dielectric breakdown tests and the events and processes that affect the breakdown of the transformer insulation have been studied since last 40-50 years. Transformer oil can give a thorough picture of the internal transformer conditions. The fault diagnosis can also be done by investigating the transformer oil. For this reason, oil samples from a transformer that is out of service due to the internal faults are taken and tested to realize the reason behind the faults. Gas Chromatography Mass Spectrometry (GCMS) was employed to investigate the oil condition of the power transformer. GC-MS results show that high molecular weight substances in faulty oil are more than fresh oil. The results are compared with that of the fresh mineral oil supplied by the same manufacturer and presented in detail.
We consider a symmetric five-body problem with three unequal collinear masses on the axis of symmetry. The remaining two masses are symmetrically placed on both sides of the axis of symmetry. Regions ...of possible central configurations are derived for the four- and five-body problems. These regions are determined analytically and explored numerically. The equations of motion are regularized using Levi-Civita type transformations and then the phase space is investigated for chaotic and periodic orbits by means of Poincaré surface of sections.
The objective of this work is to design and implement controlled (weighted round robin matching, WRRM) and sequential iterative schemes for weight based multicast traffic scheduling in input-queued ...(IQ) switches. Motivated by the practical synthesis of a scheduler for a 64-port optical crossbar switch, we demonstrate that limited and sequential iterations in the weight based arbiter (WBA) lead to adjustable clock speeds and configurable designs with flexible control in the performance characteristics close to the conventional WBA. Our FPGA sizing experiments and clock speed evaluations show improvements of upto 46.48% and 19.12%, respectively, over the WBA. In addition, latency-throughput results for the proposed variations, highlight the trade-offs between fairness, throughput, hardware complexity and speed.
Natural gas dew point temperature is a vital quality parameter. The effective control of this specification is important if the natural gas integrity and quality are to be maintained. The present ...work focuses on improving the dew point and condensation production rate of south Dabaa field dew point control unit (DPCU) located in the Egyptian western desert and owned to the South Dabaa Petroleum Company. Influence of the operational variables on outlet gas dew point and produced condensate were investigated. The simulation results illustrated that feed gas inlet temperature, composition and flow rate, Joule Thomson (JT) valve downstream, and upstream pressure and hot bypass flow rate have a great effect on the sales gas dew point as well as the condensate throughput. A field experiments were conducted to validate the simulation results. It is noticed that there is a good agreement between simulation and experimental results, considering the outlet gas dew point at different operating conditions. Lingo optimization software was used to find the plant optimum conditions. Two quadratic equations were developed based on regression analysis for calculating the dew point and plant condensate rate at any operational variables. The impact of replacing the existing JT valve by a turbo expander was studied. The simulation results indicate that the turbo expander is more effective in comparison with JT valve refrigeration system in decreasing the sales gas dew point and increasing the condensate production rate.
•The improvement of dew point and condensation production rate of south Dabaa field dew point control unit (DPCU) – Egyptian western desert - is studied.•A simulation for the above mentioned unit has been developed using HYSYS.•Influence of operating conditions on natural gas dew point and condensation rate is studied.•Two correlations for relating gas dew point and condensate throughput to DPCU operational variables are developed.•An NLP algorithm is developed to find optimum operating conditions of DPCU. The considered operating conditions are gas inlet temperature, inlet gas flow rate, JT valve upstream pressure, JT valve downstream pressure, hot bypass flow rate, and gas composition.•The influence of replacement JT valve by a turbo expander refrigeration technique on the PDCU operation has been investigated.
Digital pacer detection in diagnostic grade ECG Shoaib, M.; Garudadri, H.
2011 IEEE 13th International Conference on e-Health Networking, Applications and Services,
2011-June
Conference Proceeding
Pulses from a cardiac pacemaker appear as extremely narrow and low- amplitude spikes in an ECG. These get misinterpreted for R-peaks by QRS detectors, leading to subsequent faulty analysis of several ...algorithms which rely on beat-segmentation. Detection of the pacer pulses, thus, necessitates sampling the ECG signal at high data rates of 4-16 kHz. In a wireless body sensor network, transmission of this high-bandwidth data to a processing gateway, for pacer detection, is extremely power consuming. In this paper, we describe a compressed sensing approach, which enables reliable detection of AAMI/EC11 specified pacer pulses using ECG data rates of 50-100 sps, an order of magnitude smaller than those used in typical detection algorithms in the literature.
A seventy five days feeding experiment was conducted on juveniles of Oreochromismossambicus having the initial weight of 0.9267 plus minus 0.1464 g. The ingredients were fishmeal at the rate of 200 ...g/kg, rice protein at the rate of 530 g/kg, boiled rice at the rate of100 g/kg, squid at the rate of 20 g/kg, shrimp at the rate of l00 g/kg, fish oil at the rate of4 ml/kg, salt at the rate of 025 g/kg, minerals at the rate of 0.05 g/kg and vitamins at therate of 10 g/kg mixed and fed to juveniles twice a day at 5% of average body weight. Theweight gain % and differences between initial and final weights were increased with respect to0.2833 plus minus 0.1080 and 21.90 plus minus 11.68 (P greater than 0.05). Food conversionratio (FCR), protein efficiency ratio (PER) and specific growth rate (SGR) were significantlydifferent from the specimens reared in extensive cultural system.
We propose a novel context based human fall detection mechanism in real home environment. Fall incidents are detected using head and floor information. The centroid location of the head and feet from ...each frame are used to learn a context model consisting of normal head and floor blocks. Every floor block has its associated Gaussian distribution, representing a set of head blocks. This Gaussian distribution defines standard vertical distance as average height of an object at that specific floor block. The classification of blocks and average height is later used to detect a fall. Fall detection methods often detect bending situations as fall. This method is able to distinguish bending and sitting from falling. Furthermore, a fall into any direction and at any distance from camera can be detected. Evaluation results show the robustness and high accuracy of the proposed approach.
