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This paper describes a million-plus granule cell compartmental model of the rat hippocampal dentate gyrus, including excitatory, perforant path input from the entorhinal cortex, and feedforward and feedback inhibitory input from dentate interneurons. The model includes experimentally determined morphological and biophysical properties of granule cells, together with glutamatergic AMPA-like EPSP and...
Single-junction solar cells are approaching their theoretical efficiency limit, and tandem or multi-junction architectures provide a route for further increasing efficiency. However, due to high material cost, these technologies have traditionally been restricted to high concentrations with the penalty of the loss of diffuse light in outdoor applications. We propose a new tandem concept called a “PVMirror”...
Recently, an appealing switching strategy, named model-based predictive current control (MBPCC), has received much research attention in power electronics and drives. However, MBPCC usually requires system model (in discrete-time form) and the system parameters in its controller design. In order to eliminate these restrictions, a simplified model-free predictive current control (SMFPCC) is proposed...
The anisotropic hot-deformed (HDed) Nd-Fe-B magnets have attracted much attention for their remarkable magnetic properties and various applications due to the ultrafine grained microstructure. Hot deformation process usually consists of two subprocesses, hot pressing and die-upsetting. During this process, the initially isotropic nanocrystals in melt spun flakes transform to laterally elongated platelet-shaped...
An improved approach for predicting the armature reaction field in Permanent-Magnet AC (PMAC) machines is presented, and eddy current reaction is take into account. Winding configuration of PM machines could be various, such as concentric winding or lap winding, integral or fractional slot winding, distributed or concentrated winding, single-layer or double-layer winding. Starting with the field produced...
Recently more and more attention has been paid to the application of flux weakening of a permanent magnet synchronous machine (PMSM). In this paper, many rotor configurations of the PMSM that are suitable for flux weakening operation were reviewed. A new stator design with shunt teeth has been studied by magnetic circuit analysis and finite element analysis. The new design and the conventional design...
Hagg iron carbide nanoparticles (Fe5C2 NPs) encapsulated by carbon, which preserving high magnetic properties, can be good candidates for magnetic resonance imaging (MRI). With carbon coating, high near-infrared (NIR) optical absorbance can be pursued for potential biological applications, including photoacoustic tomography (PAT) and photothermal therapy (PTT). Here, we present Fe5C2-based NPs, Fe...
Recently, high coercivity Nd-Fe-B permanent magnet has become an indispensable material for the traction motor of hybrid electric vehicles (HEVs) or electric vehicles (EVs) [1]. The microstructure control such as grain size and grain boundary is well known method for the high coercivity in HRE-free Nd-Fe-B magnets. Hydrogenation-disproportionation-desorption-recombination (HDDR) and melt-spinning...
Having been used as an essential part in the traction motor and generator of HEV, EV and wind turbine, the Nd-Fe-B-type magnets are required to have further enhanced coercivity because of its high operating temperature. The need for developing new and cost effective technique for enhancing coercivity has been ever escalated in recent years. Common techniques for enhancing the coercivity in the Nd-Fe-B-type...
A self-designed helicon wave plasma (HWP) source with an internal "right-hand" helical antenna driven by a 13.56MHz radio-frequency (RF) source is investigated for its possible use for processing wall material in future magnetic fusion devices. The plasma beam is ejected into a larger diffusion chamber, where the ion energy distribution and electron energy distribution are measured by commercial...
Soft-sensing techniques are widely applied in such practical situations where some process variables involved in control and optimization systems can not be measured directly or reliably due to the technical limitations or economic expense. This paper proposes an on-line soft-sensor for the quality control and energy optimization of crude distillation column. Based on the system analysis, a two-stage...
A five-channel frequency-division multiplexing (FDM) fiber laser sensor array based on multilongitudinal mode fiber lasers (MLMFLs) and beat frequency demodulation was proposed. Detailed theoretical analysis of the FDM principle was also described. The potential application of the MLMFL-based FDM for strain measurement was further experimentally studied. The strain sensitivity of $-$0.92 kHz/ $\mu\varepsilon$...
For 3D IC application, solder volume in micro joint is much smaller than in the conventional joint. IMCs can easily occupied micro joints and dominate the properties of micro joint. Thus, it is anticipated that IMCs are to be used as structural materials in commercial scale in a few years. However, mechanical property data for reliability modelling are lacking. To characterize mechanical properties...
Previous studies have shown that voids were observed in 3D IC-scaled micro joints of Ni/Sn/Ni solid state reaction under severe space confinement and Ag addition can effectively eliminate the void formation. Therefore, the present study is aimed at investigation of the lower limit of Ag concentration which prevents void formation and also the effect of Ag concentration when primary Ag3Sn appears....
This paper evaluates the use of a back-to-back modular multilevel converter (B2B-MMC) in offshore low frequency (LF) AC transmission. The scheme is compared to two alternative transmission technologies: DC and 50Hz AC. The MMC topology is further compared to a cycloconverter. A high level design of a ±120kVdc, 250MW B2B-MMC system is described, with the total volume and weight of submodule capacitors...
Low frequency AC (LFAC) provides an alternative to HVDC and HVAC connections for offshore wind farms. Charging current is reduced as compared to standard 50Hz or 60Hz transmission and cable length thus may be extended. LFAC links to wind farms may be interconnected to form an offshore network - a significant advantage over HVDC technology which currently lacks a matured circuit breaker technology...
Due to the high risk of cascading failures, an online solution for N-2 failure control becomes increasingly important. Dual short-circuit fault, as one of the simplest N-2 failure, was studied in this article. Some explorations were made aiming at the composition rules of critical cluster (CC) and the relationship between the dual short-circuit fault's conservative control quantity and the individual...
the flexibility and reduced harmonics have made Modular Multilevel Converters (MMC) a popular candidate in FACTS (Flexible AC Technology) applications in network reinforcement. However, few publications so far address the inherent problems such as voltage imbalance across each arm. Voltage balancing control is an essential element in safeguarding the device reliability and power quality by reducing...
A method of along-track sparse sampling and compressed sensing imaging for forward-looking array SAR is proposed in this paper. Although the number of scatterers in the altitude direction is finite for every observation scene, the sparse sampling method is designed along the along-track direction rather than the range direction, which is proved to be effective for forward-looking array SAR. Meanwhile,...
A HFSWR system with portable small array for ship targets surveillance has been developed recently. The antennas of the radar system contain a receiving antenna array of eight-elements and an omnidirectional transmitting antenna, which can be deployed rapidly when relocated to another radar site. The configuration and the relationship of each subsystem of the hardware system is described. A signal...
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