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This paper proposes a semi-flooded cooling concept for a high speed machine design. The electrical machine considered is for an aircraft starter-generator system where power density and efficiency are crucial. In order to achieve the high power density permanent magnet machine, a direct oil cooling strategy for the machine stator is adopted. A stator oil sleeve is designed to separate the machine...
The cross-range resolution of Inverse Synthetic Aperture Radar (ISAR) image is highly dependent on the relative motion between radar and observed targets, in which the rotational motion can induce different Doppler modulation for different scatterers. However, in practice there exists only translational motion of target. In this paper, a scan-ISAR imaging algorithm for translational motion targets...
The vertical incidence reflectivity of conformai perfectly matched layer (PML) is an essential property that can demonstrate partly the error and efficiency of absorbing boundary condition (ABC). To design the high-performance conformal PML, some parametric analysis of vertical incidence reflectivity is implemented in this paper. By deducing and solving the recursion relation of reflection coefficient...
We demonstrated the enhanced terahertz transmission through superconducting NbN subw ave length hole arrays. The transmission peak value and frequency exhibit thermal tuning behaviors, which can be attributed to the temperature-dependent complex permittivity of superconducting film. The microscopic hybrid wave model was adopted to analyze the role of surface waves in the enhanced transmission theoretically...
Micro-bunched particle beams are used for a wide range of research including tunable sources of THz radiation. In most of the applications accurate and non-destructive monitoring of the bunch-to-bunch separation is required. We present the results of proof-of-principle experiments on measuring the distance between two micro-bunches via the analysis of the coherent Smith-Purcell signal amplitude modulation...
Aiming at the problem of inefficiency, low degree of automation in high voltage insulator detection, an auto detection system for insulator inspection robot was designed. Step motor was adopted as the drive for robot moving joints, FPGA was adopted as main control unit for step motor control, signal acquisition and wireless communication control. The man-machine interface was programmed by LabVIEW...
Along with the higher requirement of aircraft's generation system proposed, Integrated Starter Generator system appeared on the stage of history which can work as an electric motor and a generator at the same time. This paper talks about a Permanent Magnet Machine (PMM) which is applied as Integrated Starter Generator (ISG) used into the unmanned aerial vehicle (UAV). Permanent Magnet Machine has...
TIDs are the large scale electron density perturbations that travel in the ionosphere and can be tracked by number of instruments, like incoherent scatter radar, ionosondes, HF Dopler system etc. They are believed to be the signature of atmospheric gravity wave in the high latitude ionosphere, which are generated due to geomagnetic activities [1].
We study the strain profiles of Type-I CdS/CdSe quantum ring (QR) using the Valence force field method with Keating potential. The strain affects its electronic bandstructure which is calculated for varying QR widths using an effective mass envelope function theory based 8-band k·p model. This is followed by an electron-hole charge distribution study of the QR.
Automatic target recognition is a crucial task for SAR remote sensing. Unlike other methods, the unsupervised representation learning based on deep architecture can obtain robust high-level features directly from raw data. A drawback of most unsupervised representation learning methods in SAR ATR is that they only deal with amplitude images. In addition, many methods utlize a single layer architecture...
Optical absorption is an important characteristic of CdSe nanoplatelets (NPLs) used for optoelectronic applications. Here, we theoretically investigate the absorption spectra of CdSe NPLs considering Sommerfeld enhancement and excitonic effects and study its relation with the electronic structure and optical transition matrix elements.
The bandgap reference circuits are very sensitive to electromagnetic interferences (EMI) which induce voltage offset on their outputs. Two bandgap chips with different technologies are designed for EMC study. The conducted immunity of VDD and VSS pins are tested following direct power injection (DPI) method. The aim of this study is to compare the susceptibility characteristics of same bandgap circuit...
Owing to their wide range of exceptional properties, two-dimensional (2D) materials have emerged as exciting media for the development of highly functional optoelectronic devices. Of these materials, the transition-metal dichalcogenides (TMDCs) are of particular interest as, unlike graphene, they are often semiconductors, and their optoelectronic properties can be tuned quite dramatically by controlling...
Sinter joining with Ag particle pastes has attracted much attention for wide band gap power assembly that requires high power and high temperature interconnection technology. The micron/submicron Ag particle hybrid paste, which is affordable with excellent performance, is one of the promising materials. Bonding conditions are very much mild such as 250 °C, low pressure less than 1 MPa and air atmosphere...
We demonstrate a silicon photonics coherent transceiver in a ball-grid-array package. It can be handled like a conventional surface-mount-technology component, surviving pick-and-place and 260° C reflow. It saves cost, size and provides enhanced thermals and bandwidth.
Algae was widely observed on composite insulators in hot and humid climate, which affected external insulation performance of polymeric insulating materials especially on hydrophobic properties. To fully understand the hydrophobic behavior of algae-fouled insulators, this paper simulated algae growing process on silicon rubbers (SIRs) surface under artificial laboratory conditions. Hydrophobicity...
Theoretical calculations for L10-MnGa compound indicate a high anisotropy constant, Ku (26 Mergs/cm3) and a saturation magnetization, Ms (116 emu/g), which predict a maximum energy product, (BH)max, of 28 MGOe.
Ag sinter die-attach is utilized for bonding SiC Schottky-barrier diode (SBD) dies on Cu lead frames metalized by Ni/Pd/Pt/Ag electroless plating. After Al wiring, the assembled structure was mold-packaged by imide-based high temperature thermosetting resin. The produced devices are then subjected to environmental tests of high temperature storage at 250°C, and of thermal cycling between −50°C and...
Soft-error rates (SER) of Flip-Flop (FF) designs in a 16-nm bulk FinFET technology are characterized with thermal neutron, high-energy neutron and alpha particle irradiations. Results show that the contribution of thermal-neutron-induced SER can be higher or lower than alpha-particle-induced SER for different FF designs and can be comparable to high-energy-neutron-induced SER for some FF designs....
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