Abstract The paper deals with the influence of a loss of one phase of a feeding source on the properties of a five-phase induction machine. The attention is paid to the waveforms of the currents in individual stator phases, the increase in torque pulsations and the decrease of speed in emergency operation after the disconnection of a faulty phase of the source. Machines in star, pentagon and …
Abstract The efficiency and installation costs of solarpowered drip irrigation systems depend on not only the efficiencies of the electrical motor, its driver, and the pump, but also the efficient usage of irrigation water. In this study, the initial installation costs and energy consumption of photovoltaic irrigation systems were decreased by obtaining the soil moisture level as a reference …
Abstract The application of the XLPE cable under DC stress is now being considered as one of the promising tool for enlarging the limited transmission capacity of the traditional electric power cable due to the several technical advantages. Therefore, many research institutes are trying to improve the performance by carrying out experimental investigations related to the reliability of the ca…
Abstract The formulations employed to the optimization of passive filters can be classified as formulations of a single objective or formulations with multiple objectives. The single-objective formulations normally are devoted to determine the filters of lowest cost that assure the compliance with the power quality standards, while in the multi-objective approaches are added other goals that …
Abstract It has been conventionally believed that there exist 4n variables P, Q, V, θ for an n-bus system in the power flow computation, while we have 2n power flow equations. In this article, the authors argue that the number of variables in an nbus system is not 4n but 4n−1, hence the power flowsolution can be obtained without specifying the reference angle of the slack bus.We then deliv…
Abstract The effect of high photovoltaic (PV) penetration with constant injected voltage on the loss of excitation phenomenon of single machine infinite bus power system with two transmission lines has been investigated. The PV modules are integrated to the power system at the same bus of the synchronous generator via DC–DC buck–boost switch mode converter, three-phase DC–AC switch mode…
Abstract This article deals with the problem of electrical discharge initiation in mineral oil in the setup of insulated electrodes. The results of laboratory experimental studies were collated with the results of the numerical calculations of electrical field stress. Both kinds of the research methods were applied to analyze the two model electrode setups immersed in mineral oil: setup with …
Abstract In the October 2009 issue of this Journal, we introduced a special pot type, which could improve the energy efficiency of induction cooking, make the boiling process faster and the cooking more comfortable. The dissipated power in the new pot was significantly higher than in the traditional ones at any inductor current. In this paper we show another pot type with similar advantages, …
Abstract Today electronic devices require a power supply without any variation or disturbance. Nevertheless, electrical variations presented in power lines are more frequent and powerful. The consequences of poor power quality devices. Thus, in this study, an FMEA is presented to know which electrical variation has more effect on the reliability of electronic devices. The analysis was perform…
Abstract The results of the breakdown time lags obtained by commercial “OSRAM St 111” gas diode are presented. The memory curves for different voltages (for 220, 250 and 300 V) are shown. The analysis of the experimentally obtained distributions (histograms and Laue distributions) for different voltages (for 220, 250 and 300 V) and different relaxation times (from 1 to 1500 ms), as well a…
Environmental Fluid Mechanics (EFM) is the study of motions and transport processes in earth’s hydrosphere and atmosphere on a local or regional scale (up to 100 km). At larger scales, the Coriolis force due to earth’s rotation must be considered, and this is the topic of Geophysical Fluid Dynamics. Sticking purely to EFM in this book, we will be concerned with the interaction of flow, …
Abstract Every day, the evaluation of classical distribution networks (DNs) to smart grids (SGs) has become a necessity, and renewable energy sources (RESs) are an important part for smart grids. One of the most significant problems for RESs is the sustainability of energy, because the raw material storage is not possible for renewable energy sources as photovoltaic (PV), wind, etc. Therefore…
Abstract Line start-permanent magnet synchronous motor (LS-PMSM) is one of the modern high efficiency motor introduced to the industry, recently. Like other types of electrical machines, various failures may happen in LS-PMSM during its life time. Among different failures which may occur in the motors with squirrel cage rotor, rotor fault (broken rotor bar) is the most significant one. This p…
Abstract This study presents an advanced computer interactive system for automatic parallel connection of synchronous generators and load sharing control between them. Because of its high operation speed and precision, a dsPIC microcontroller has been used in the study to control the conditions for paralleling and then to realize the connection, to transfer the real time data among the contro…
Abstract The paper introduces the possibility to eliminate certain groups of spatial harmonics of the current layer, magnetic flux density in the air gap and flux in the yoke of the induction machine with the aim to increase the efficiency. The content of higher spatial harmonics is reduced by means of the so-called combined winding. It is shownhowthis winding must be arranged in stator slots…
Abstract Traditionally, the core losses of permanent magnet synchronous motors are assumed to vary as a function of rotational speed and the supply voltage. In this paper, the effect of armature reaction on the core losses under constant speed and stator voltage is studied. The load angle of the machine is varied, and the core losses are determined using the finite element analysis.To explain…
Abstract This paper presents an experimental investigation of a small-scale wind turbine conversion system (WTCS), using wind power simulator based on a permanent magnet type synchronous generator (PMSG) which is directly coupled to a servomotor to emulate the WTCS. The wind power simulator is either speed or torque controlled in which propose a “wind shaft”, to verify the dynamic and sta…
Abstract In this paper, an extrinsic Fabry–Perot interferometer (EFPI) has been demonstrated for strain measurements. A monochromatic light source with a wavelength of 1310 nm is propagated into a single-mode fiber and then passed through the sensing arm. Approximately, 4 % of the beam is reflected off at the fiber end generating the “reference signal”, while the rest is next transmitte…
Abstract A squirrel cage induction motor has been the workhorse in industry for variable speed applications in a wide power range that covers from fractional horsepower to multi megawatts. But the control and estimation of ac drives in general are considerably more complex than those of dc drives. The advent of vector control techniques has partially solved induction motor control problems. H…
Abstract Magnetic devices are essential components in the field of power electronics. Exploiting the non-linear behavior of inductors and transformers offers the great merit of increasing the performance of switch mode power supplies. For instance, the light-load efficiency of a buck voltage regulator can be improved by using a non-linear inductor with stepped air gap. Moreover, non-linear ch…
Abstract This study presents an artificial neural-network (ANN)-based digital fault classification and location algorithm for medium voltage (MV) overhead power distribution lines with load taps and embedded remote-end source. The algorithm utilizes frequency spectra of voltage and current samples which are recorded by the digital relay at the substation. In the algorithm, to extract useful i…
Abstract Distributed generation (DG) is predicted to play an increasingly important role in the future power system. DGs, however, can provoke technical problems when they are added to the existing system. An islanding is one of those problems while using DGs. During that mode, the power electronic interface of DGs has both roles of keeping the point of common coupling’s voltage within a re…
Abstract In this paper, a novel single-stage single-phase buck–boost inverter design is presented. Depending on the duty ratio, the output voltage of the proposed inverter can be lower or higher than the DC input one. Similar to the conventional voltage source inverter, the proposed inverter includes four power electronic switches without the need for any extra switches. All the inverter fo…
Abstract Validation of an estimated model is not a trivial task because it depends on the purpose of the model, which usually defines the most important features of the model. Thus, in a validation process, the use of diverse tools that exploit different domains is recommended. Here, with this aim, a scale for model validation is proposed that combines the Normalized Root Mean Square Error …
The transport properties of concrete measure the ability of fl uids to move through it. The equations for them were fi rst documented by the end of the nineteeth century (Fick 1855 ; Darcy, 1856 ) and applied to concrete by the middle of the twentieth century (Powers et al ., 1954 ). However, they remain diffi cult to measure, particularly if the common in situ tests are used. Interest in …
The infrastructure of constructed facilities for the transportation and housing of people, goods, and services, which grew exponentially over the latter half of the last century is rapidly approaching a critical period, with increasing signs of deterioration and reduced functionality. Defi ciencies in the existing bridge inventory, for example, range from those related to wear, environment…
Settlement calculation is one of the three major issues in foundation engineering and it has not yet been resolved completely. Especially settlement calculation of super high-rise buildings still remains the most difficult problem for engineers. Due to lack of practical settlement data, there is few systematic research result and rarer monograph to investigate this special problem. This bo…
The provision of earthquake resistant structures and facilities is one ofthe main concerns of Civil and Earthquake Engineering Profession. As such, the main objective of seismic instrumentation program for civil engineering structural systems is to improve our understanding of the behavior and potential for damage of structures under the dynamic loads of earthquakes. As a result of this und…
In the present decade, the world has witnessed many great earthquakes like Bhujj in India in 2001, Iran in 2003, the Asian Tsunami in Indonesia in 2004 and Pakistan in 2005 resulting in the death of thousands of people and significant property damage. Housing and safety are basic human needs. Structures adequately designed for usual loads need not necessarily be safe for earthquake forces.…
Our book is intended to serve as both a textbook for graduate level courses in enfineering and reference volume for engineers and scientist. We assume that the reader has the background of the B.S. level mechanics courses in departements of civil, mevhanical, or aerospace engineering. Aside from synthesizing the main results already available in the literature, our book also contains some new r…
Sedimentation engineering embraces the identification, planning, analysis, and remediation, principally in the context of civil and hydraulic engineering practice, of projects or technical investigations to avoid and/or mitigate problems caused by sedimentation processes. These processes include erosion, entrainment, transport, deposition, and compaction of sediment. External agents and forces …
Synthetic polymers and fibre reinforced polymer composite systems have become increasingly important to the civil and structural engineer over the last decade and now have a wide range of applications in a variety of engineering fields. A large percentage of all fibre reinforced products are made from unsaturated polyester resins reinforced with glass fibre. However, epoxy and toughened…
We began to formulate the initial ideas for this Manual as early as 2006. It had become apparent to us that civil and structural engineers not specialising in geotechnics face a daunting knowledge gap when they come up against a geotechnical problem. Most civil engineers leave university with very little grounding in geotechnical engineering. They will have a fair grasp of applied mechanics …
We began to formulate the initial ideas for this Manual as early as 2006. It had become apparent to us that civil and structural engineers not specialising in geotechnics face a daunting knowledge gap when they come up against a geotechnical problem. Most civil engineers leave university with very little grounding in geotechnical engineering. They will have a fair grasp of applied mechanics …
What makes earthquake risks so catastrophic and dreadful? Possible reasons are attributed to the sudden, unpredictable, involuntary, and large-scale nature of the risks. As a consequence of a devastating earthquake, a tremendous surge of seismic damage and loss may overwhelm the risk-bearing capacities of households, companies, municipalities, and insurers, and may eventually cause serious…
Nature has never attended a course in probability theory. This poignant philosophical statement underlines the fact that the phenomenon of uncertainty cannot be described by means of probability theory alone. Data and models encountered in the natural sciences and engineering are more or less characterized by uncertainty. With the inclusion of interval variables and random variables classical m…
The most significant issues facing mankind today are related to the quality of our environment. Past decisions did not always consider environmental factors as critical elements. However, current decisions made daily should reflect the importance of the environment. All environment-related issues are multidisciplinary, ranging from science and engineering to social, economic, and regulatory iss…
The treatment of contaminated land to eliminate or reduce the presence of pollutants in the contaminated site has received (and will continue to receive) considerable attention from the practicing profession. Extensive research and development are still underway in respect to the delivery of more effective (and economic) means for site decontamination. The ongoing results can be seen in the…
This book presents the state-of-the-art principles, practices, and techniques related to estimating building costs in metric. It is primarily designed as a textbook for graduate and upper-division undergraduate students in civil engineering, architectural engineering, construction engineering and management, and related programs. Instructors should find the book very useful and suitable for…
It is becoming increasingly evident that human activities are the major cause of climate change and global warming. Human activities have caused major changes in our land, water, and atmosphere leading to permanent modifications to our environment such as removing major areas of forest land on Earth and increasing atmospheric greenhouse gases. As the threat of climate change becomes more p…
Damages due to catastrophic earthquakes are huge. Over a million and half people have been killed during the most catastrophic ten earthquakes that have occurred since 1900. Still, the number of victims and material damage due to earthquakes has permanently been growing although, according to statistics, the number of catastrophic earthquakes per annum is constant. For example, the Haiti ea…
Module parallel connection for three-phase VSC can increase the system level effectively. However, the circulating currents problem will occur. The circulating currents will distort the three-phase currents, increase the power loss and decrease the system efficiency.Anovel deadbeat circuiting currents control method is proposed in this paper. Based on the analysis of the average model of parall…
This paper presents an electric circuit-based battery and a capacity fade model suitable for electric vehicles (EVs) in vehicle-to-grid applications. The circuit parameters of the battery model (BM) are extracted using genetic algorithm-based optimization method. A control algorithm has been developed for the battery, which calculates the processed energy, charge or discharge rate, and state of…
We propose a 2D shape deformation method to fit technical drawings of garments (“flats”) to body figure drawings with a diversity of fashion poses. We first dress a flat onto a body figure in a standard standing pose using Radial Basis Function (RBF) mapping. For different types of clothing, we suggest two levels of treatment to determine handles automatically. We deform the flats using th…
This paper introduces the development and implementation of a ball mill grinding circuit simulator, NEUSimMill. Compared to the existing simulators in this field which focus on process flowsheeting, NEUSimMill is designed to be used for the test and verification of grinding process control system including advanced control system such as integrated control. The simulator implements the dynamic…
Radio frequency identification (RFID) is a ubiquitous wireless technology which allows objects to be identified automatically. An RFID tag is a small electronic device with an antenna and has a unique identification (ID) number. RFID tags can be categorized into passive and active tags. For passive tags, a standard communication protocol known as EPC-globalGeneration-2, or briefly EPC Gen-2, is…
We examine a scheduling problemof cluster tools that concurrently process two wafer types in a cyclic operational sequence. Whereas the process steps for different wafer types are assigned to different processing modules (PMs), the wafer loading and unloading tasks at the PMs are performed by a single robot. For a given cycle plan, which is a mix of different wafers for each cycle, we wish to d…
We used a seven-step process to identify genes involved in glucosinolate biosynthesis and metabolism in the Chinese cabbage (Brassica rapa). We constructed an annotated data set with 34,570 unigenes from B. rapa and predicted 11,526 glucosinolate-related candidate genes using expression profiles generated across nine stages of development on a 47k-gene microarray. Using our multi-layered screen…
This paper reports the development of a maximum power-point tracking (MPPT) method for photovoltaic (PV) systems under partially shaded conditions using firefly algorithm. The major advantages of the proposed method are simple computational steps, faster convergence, and its implementation on a lowcost microcontroller. The proposed scheme is studied for two different configurations of PV arrays…
When a single Cloud service (i.e., a software image and a virtual machine), on its own, cannot satisfy all the user requirements, a composition of Cloud services is required. Cloud service composition, which includes several tasks such as discovery, compatibility checking, selection, and deployment, is a complex process and users find it difficult to select the best one among the hundreds, if n…