The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper deals with the analysis of slip effect on laminar magneto hydrodynamic (MHD) flow of incompressible viscous fluid past an infinite porous plate subjected to slightly sinusoidal transverse suction velocity distribution. A uniform magnetic field normal to the plate is applied. The suction velocity distribution consisting of basic steady distribution with a superimposed weak transversely varying...
Effect of geometrical parameters including core separation between two fused fibers and coupling length on output characteristics of 2×2 single mode fiber (SMF) coupler at 1550nm band is studied. Simulations are carried out by using BPM CAD software. The simulation data is then used to manufacture 2×2 SMF coupler. Parameters are optimized to achieve 50∶50 coupling ratio. The error in measured results...
a mathematical model for the 3-dimensional Couette flow of an upper convected Maxwell fluid is established and studied theoretically. Perturbation method is applied to solve the overriding equations. The dependence of main flow velocity component through parallel porous plates on flow factors such as injection/suction parameter, Reynolds number injection/suction parameter and the Deborah number are...
In this work, we discuss utility of Restricted Boltzmann Machine (RBM) in face-deidentification challenge. GRBM is a generative modeling technique and its unsupervised learning provides vantage of using raw faces data. Faces are deidentified by reconstructed face images from the trained GRBM model. The reconstructed image uses random information from the stochastic units which makes it hard to re-identify...
Feasibility of using low density polyethylene (LDPE) and its hybrid with vinyl-tri-ethoxy silane has been evaluated after its thermal and electrical aging according to IEC 1109 5000hour multi-stress aging protocol. The degradation of pure, silane grafted and cross linked samples is studied after three aging cycles and their leakage current and hydrophobicity classification is presented. Material is...
Real Time Hardware-in-the-Loop (RT-HIL) performance assessment of three different passive islanding detection methods for both local and wide-area synchrophasor measurements is carried out in this article. Islanding detection algorithms are deployed within the Phasor Measurement Unit (PMU) using logic equations. Tripping decisions are based on local and wide-area synchrophasors as computed by the...
International interconnections generate a series of advantages within those countries that are connected. The most significant of these is the contribution to the security and continuity of the electricity supply within those interconnected systems. This paper presents the benefit of regional-interconnection networks, and the improvement of Iraq transmission network in its generation and transmission...
Electromechanical oscillations one of the most important stability limits constraining power transfer between two countries. This paper presents different power system electromechanical oscillation types, and focuses on inter-area oscillation, where SVC is chosen to be installed at the midpoint of long tie line between Iraq and Turkey, so as to be more effective for two options: the first option is...
Recently, content-based Spam detection frameworks are receiving a significant amount of attention by academic researchers and industrial practitioners. However, the anticipated wide scale proliferation is limited (mainly) because of two important shortcomings: (1) high false alarm rate that results in moving legitimate messages into Spam folders, and (2) inability to self-learn a user's profile, as...
This paper discusses the design, analysis and optimization of highly compact, multi-band and low profile patch antenna on a 0.5 mm thickFR-4 substrate (εr=4.4). The need for compact and multi-band antennas is the key in the realization of portable electronics, like smart phones, iPads and laptops. In this paper a slotted, circular patch antenna is presented which operates, giving a dipole like radiation...
In ancient times goods and services were exchanged through barter system1 Gold, valuable metals and other tangibles like stones and shells were also exploited as medium of exchange. Now Paper Currency (PC) is country-wide accepted common medium of trade. It has three major flaws. First, the holder of currency is always at risk due to theft and robbery culture in most of the societies of world. Second,...
Capnometers measure the concentration of CO2 in exhaled breath which could prevent serious problems in all areas of healthcare, from pre-hospital to extended care, and everywhere in between. Presently, high cost, big size and high power usage limit the scope of the conventional capnometers and their adaption. To overcome these issues, a CMOS MEMS micro-cantilever has been proposed for capnometric...
This article provides an overview of a monitoring application, its testing and validation process. The application was developed for the detection of sub-synchronous oscillations in power systems, utilizing real-time measurements from phasor measurement units (PMUs). It uses two algorithms simultaneously to both detect the frequency at which the oscillatory event occurs and the level of energy in...
This article presents a software development toolkit for Wide Area Monitoring Systems. By using this development toolkit, a researcher is able to manipulate synchrophasor data in the LabView environment, which enables fast software prototyping and testing. This toolkit makes full scale testing in real-time easier for researchers, liberating them of complex and time consuming synchrophasor data handling...
It is well-known that the exploration of hydrocarbons (oil and gas) has been playing a major role in the world economy. Excessive exploration activities have pushed the reservoirs of oil and gas either into hard terrains such as thrush, folds, basalts and sub-basalts or several kilometers deep into the surface of the earth. Traditional seismic methods and equipment are not sufficient to ensure the...
Wide-area early warning systems are dependent on synchrophasor data-based applications for providing timely information to operators so that preventive actions can be taken. This article proposes the use of voltage sensitivities computed from syncrhophasor data for voltage stability monitoring, and a visualization approach that can be implemented in wide-area early warning systems. In order to provide...
Image processing is one of the hottest research field and researchers from the last decade have proposed many efficient approaches for image analysis and retrieval. Semantic technologies like ontology offers promising approach to image retrieval as it tries to map the low level image features to high level ontology concepts. In this paper, we have proposed Ontology based Image Retrieval (OIR) system,...
In this paper, we propose a novel algorithm for automatic modulation classification of single carrier digital modulations widely used in High Frequency (HF) band that serves both military and civilian applications. Specifically, the proposed algorithm addresses the classification of 2FSK, 4FSK, 8FSK, 2PSK, 4PSK, 8PSK, 16QAM, 32QAM, 64QAM, and OQPSK using two features: Dissimilarity in constellation...
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...
Multichannel fast QR decomposition RLS (MC-FQRD-RLS) algorithms are well known for their good numerical properties and low computational complexity. The main limitation is that they lack an explicit weight vector term, limiting themselves to problems seeking an estimate of the output error signal. This paper presents techniques which allow us to use MC-FQRD-RLS algorithms with applications that previously...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.