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.
A novel hybrid model is proposed in this paper to describe the highly-nonlinear hysteretic relationship between the torque and angular velocity in a magnetorheological pin joint (MRP). The MRP's hysteresis loop is modelled by a mixture of hyperbolic and Gaussian functions using the curve fitting technique, resulting in a significant reduction of the model parameters. To identify the model parameters,...
This paper presents a power balance control (PBC) scheme for switched reluctance generator (SRG) wind power system integrated with DC microgrid. First, a switched reluctance generator wind power system is, which acts as distributed energy source, is integrated with a 24V utility DC microgrid. With proper convertor design and control characteristic for SRG system, output voltage ripple is minimized,...
Multiple dissipative soliton operation is numerically found to be caused by the spectral filtering effect. Strong peak-power-clamping effect is required for the dissipative-soliton-resonance generation. The peak power is controlled by the cavity peak-power-clamping effect.
Isogeometric analysis (IGA) has recently become popular in computational science during the past decade or so. IGA tries to to unify both geometric and field representation; in other words, both the geometry and the fields are represented using the same underlying basis set. However, while the concept of IGA for differential equations is more common, extension to an integral equation framework is...
Electromagnetic (EM) analysis for inhomogeneous penetrable structures relies on the formulation of volume integral equations (VIEs) in integral equation approach and time-domain VIEs (TDVIEs) are required for transient interaction with the structures. The TDVIEs are usually solved by combining the method of moments (MoM) with well-designed basis function in spatial domain and a march-on-in-time (MOT)...
Synthetic aperture radar (SAR) imaging is demonstrated using a small consumer drone. The entire imaging system including an ultra-wideband radar, antennas, and a single-board computer fits on a small drone and is controlled through a Wi-Fi connection. Motion compensation is carried out based on a prominent scatterer algorithm. The focused SAR image of four trihedrals is validated against simulation...
Subdivision surfaces are a powerful geometrical modeling tool that has been used extensively in computer graphics. In this paper we develop a general subdivision-based basis scheme that can be applied to a wide range of electromagnetic integral equations, and demonstrate several features and advantages.
Vegetable oil is based on natural ester oil, which is considered as the alternate natural source of traditional mineral insulating oil in electrical transformers. The oil applied in transformers performs dual functions of insulating and cooling materials. The purpose of this paper is to obtain a new type of nano-modified vegetable oil with both improved dielectric and thermal properties. Boron nitride...
In this paper, a more systematic and rational approach to design of compliant flexure-hinge amplification mechanisms is presented. The existing approach has only considered the amplification ratio but not the orientation difference between the input and output. This has caused the inadequate classification of flexure-hinge amplification mechanisms and difficulty in designing of them. In the proposed...
FinFET has become the mainstream logic device architecture in recent technology nodes due to its superior electrostatic and leakage control [1,2,3,4]. However, parasitic capacitance has been a key performance detractor in 3D FinFETs. In this work, a novel low temperature ALD-based SiBCN material has been identified, with an optimized spacer RIE process developed to preserve the low-k value and provide...
This paper reports a microfluidic enabled print-to-screen (P2S) platform, which can achieve low-cost, high-throughput, high-precision printing with plug-and-play disposable cartridge, as well as parallel screening with minimized crosstalk. The performance of the P2S platform is characterized and, using this platform, the cell-killing performance of 3-out-of-10 drug combinations towards ovarian cancer...
Cadmium telluride (CdTe) is the leading commercialized thin-film photovoltaic technology. Copper is commonly used in back contacts to obtain high efficiency, but has also been implicated as a harmful factor for device stability. Thus it is critical to understand its composition and distribution within complete devices. In this work the composition and structure of the back contact region was examined...
Currently, there is significant attention being paid to the development of high-speed machines including motors and generators. In particular, permanent magnet machines are gaining more traction due to their outstanding efficiency, high power density, small size, low weight, simple mechanical construction, easy maintenance and good reliability. The higher the motor speed, the smaller the electric...
Motivated by the experimental isolation of graphene [1], intense investigations have been paid the physical properties of the two-dimensional (2D) honeycomb lattice. Graphene is regarded as a promising material for spintronic applications due to its weak spin-orbit coupling and long spin lifetimes [2]. Up to now, several groups have studied the spin transport properties in graphene with magnetic and...
This paper proposes a new permanent-magnet vernier (PMV) in-wheel motor to meet the new demands arising from in-wheel electric vehicles. It can offer the advantages of light weight, compact size and low-speed high-torque operation. The mechanical gear can be removed by introducing flux-modulation poles. By using the time-stepping finite element method, the performance of the proposed machine can be...
Magnetostrictive materials suitable for high sensitivity strain sensor and ultrasonic transducer have increasingly attracted researchers' interest recently. Nonmetallic magnetostrictive materials based on co-ferrite are excellent candidates for rare earth giant magnetostriction materials for the unique advantages of high strain sensitivity, high electrical resistivity, low cost, chemical and thermal...
Deep brain stimulation (DBS) is needed for treatment of neurological and neuropsychiatric disorders [1-6]. Currently DBS with implanted needle electrodes requires a delicate surgical procedure that is invasive and costly. Transcranial magnetic stimulation (TMS) has been developed and attempted for non-invasive treatments of various neuropsychiatric disorders [7-10]. Unlike DBS, the pulse magnetic...
Electromagnetic limited-angle torque motors (LATMs) which have a limited angular movement less than 180 degrees are widely applied in industry, particularly for positioning tasks. Compared with common rotating motors, LATMs have many advantages such as simple structure, high reliability, and uncomplicated control mode. In general, radial-flux permanent-magnet LATMs have two conventional types which...
Direct-drive permanent magnet (DDPM) generators have been widely adopted in the wind power applications due to the higher reliability, and lower maintenance cost, compared to that of the doubly fed induction generators (DFIG) with the gearbox [1]. However, the magnets are vulnerable to be demagnetized under the short circuit condition. Due to the reliability concerns, the demagnetization performance...
Flux-modulation power-split devices for hybrid electrical vehicle (HEV)s have been obtaining attentions in recent years due to its brushless and high torque density. However, the flux-modulation power-split devices always suffered from low power factor, which is even lower than 0.6 and results in higher cost and larger volume in the converter. This paper proposes a novel dual mechanical port, spoke...
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.