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The functionality of AUVs is limited by their relatively short battery life (on the order of hours). In order to extend the time an AUV can remain on station, various in situ recharge methods have been investigated. This research focused on inductive power transfer (IPT), which is especially conducive to underwater applications because all components can be sealed and require no direct electrical...
The computer mouse is the main interaction device for graphical user interfaces. Many attempts have been made to replace it or render it obsolete, ranging from more ergonomically shaped designs to pen-like devices or touch screens. While the latter have opened up the way for completely new interaction designs mainly on mobile devices, PC and laptop users still prefer the computer mouse as a pointing...
A high-efficiency bidirectional DC-DC converter for electric vehicle supercapacitor systems is presented. Compared with traditional IGBT power devices, wide bandgap devices can be effective here, but cost and technical issues such as gate oxide reliability are seen as drawbacks. A potentially attractive alternative device is the silicon super-junction MOSFET. However, the behaviour of the intrinsic...
We study efficient computation of Minimax distances measures, which enable to capture the correct structures via taking the transitive relations into account. We analyze in detail two settings, the dense graphs and the sparse graphs. In particular, we show that an adapted variant of the Kruskal’s algorithm is the most efficient approach for computing pairwise Minimax distances. However, for dense...
In order to yield a more balanced partitioning, we investigate the use of additive regularizations for the Min Cut cost function, instead of normalization. In particular, we study the case where the regularization term is the sum of the squared size of the clusters, which then leads to shifting (adaptively) the pairwise similarities. We study the connection of such a model with Correlation Clustering...
Industrial ecology seeks options to lessen the environmental impact of industrial systems, through reducing natural resource use and waste generation, and by emulating the cycles that are utilized in ecosystems and nature. Design facets of energy selection and energy efficiency, which are key parts of Design for Environment and thus important considerations in industrial ecology, are described. The...
Target chasing control of autonomous mobile robots is important for both civilian and military applications. Efficiency and stability are two important factors in chasing problem. The robot is expected to chase the target quickly to save time. Besides, the driving velocity and direction of the mobile robot should be changed smoothly to avoid wheel slippage or mechanical damage during the chasing process...
The traditional human resource management mode is inefficient, the management process is not standardized, the management cost is high. With the development of modern information technology, all walks of life management model and values have been hit. Especially for modern enterprises, the application of modern information technology plays an important role in changing the traditional human resources...
Parallel graph processing has been routinely used to solve problems in a wide range of real life applications today. Efficiently handling many concurrent graph processing queries in a multi-user environment is highly desirable as we enter a world full of edge device oriented services. Existing research, however, primarily focuses on processing a single, large graph dataset and leaves the efficient...
A mathematical model to study changes in the energy parameters of a submersible electrical motor (SEM) through rotor pack parameters variations has been completed. Resistance variations influence coefficients of rotor pack short-circuited winding PEDN (SEMI)32–117 to power losses in the pack as well as efficiency and SEM air gap torque were determined in the Mathematica software. The worst-case energy...
LINC amplifier efficiency is estimated. Amplifier simultaneously applies the combination of two methods to improve the efficiency of signal components combining. Evaluation is performed by simulation with multichannel signal samples transmitted through the amplifier. The results show the gain in efficiency compared to using one of the methods.
In this paper transformer rectifier units with magnetic cores made from amorphous steel are investigated. The features of the use of amorphous alloys are shown and their comparative analysis is carried out. Calculations of two types of transformer rectifier units with a magnetic core made from various amorphous steels are made. According to the results of calculations experimental samples are made...
In recent years, the use of non-conventional renewable energies, particularly photovoltaic solar energy, has been growing steadily in the country and is currently a real alternative to collaborate in the production of energy required by the national industry. Motivated by the above is that the study and development of technology in Chile for this energy opportunity is fundamental at the present time...
Wireless power transfer (WPT) is the future solution for electric vehicles due to its merits compared to conductive charging. The main obstacles to WPT are efficiency and power transfer capability. Compensation topologies play a key role in improving efficiency and power transfer capability of WPT. This paper carries the evaluation of electrical parameters for wireless charging of an e-Rickshaw through...
Power quality is an important aspect in data centers and power system operators prefer data centers with high standard power quality. Modern data centers consume large amount of electrical power. As the cooling systems are accounted for 40% of the total power consumption in data centers, energy efficiency in this sector is of high importance. This research investigates if the existing energy efficient...
Permanent magnet synchronous motor (PMSM) drives include several design and control variables that affect power losses. The improvement in system efficiency through control techniques will reduce the size of inverter and motor cooling system as well as the operating costs of the system. This paper proposes a comprehensive analysis of loss controllability using various control parameters to reduce...
In this work, a comparative study for the n-type emitter formation in the fabrication of simple structures of crystalline silicon (c-Si) solar cells is reported. Gas and spin on dopant sources were employed in the pn junction formation of the solar cells in order to compare their performance. Phosphine (PH3) was used as n-type gas for phosphorus diffusion while the Filmtronics Spin-On Dopant SOD-P905...
This paper investigates the characteristics of both efficiency and voltage regulation of a practical single-phase distribution transformer when the shape and dimension of the laminated core are varied. Typically, the iron core of a traditional transformer is composed of E- and I-shape laminations to reduce core loss. The reluctance for the magnetic-flux path inside the iron core of a transformer is...
Growing attention towards environmental sustainability of energy conversion and stricter efficiency standards are encouraging the market penetration of high-efficiency electrical motors. Current regulations define international efficiency classes and the testing procedures for direct-on-line machines only, commonly induction motors. Synchronous reluctance machines are a valid alternative to the widely...
The majority of wireless power transfer (WPT) systems transfer power in a directional manner. Recently, omni-directional WPT systems have been addressed by several research groups. This paper describes a discrete exciting voltage control technique for wireless power transfer via magnetic resonant coupling with multiple orthogonal transmitter coils which can maximize the power transfer efficiency in...
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