Within the fluid iron cores of terrestrial planets, convection and the resulting generation of global magnetic fields are controlled by the overlying rocky mantle. The thermal structure of the lower mantle determines how much heat is allowed to escape the core. Hot lower mantle features, such as the thermal footprint of a giant impact or hot mantle plumes, will locally reduce the heat flux thro...

A feature shared by many regular black hole spacetimes is the occurrence of a Cauchy horizon. It then commonly believed that this renders geometry unstable against perturbations through mass-inflation effect. In work, we perform first dynamical study effect taking into account mass-loss due to Hawking radiation. shown time-dependence background leads two novel types late-time behavior whose pro...

A three-phase interior permanent magnet (IPM) machine with 18-stator-slots/12-rotor-poles and concentrated armature winding is commercially employed as a 10 kW integrated-starter-generator in commercial hybrid electric vehicle. For comprehensive fair evaluation, pair of flux-switching (FSPM) brushless machines, namely one stator (SPM-FS) machine, rotor (RPM-FS) are designed compared under the s...

In this paper, we weaken the conditions for the existence of adjoint closure operators, going beyond the standard requirement of additivity/co-additivity. We consider the notion of join-uniform (lower) closure operators, introduced in computer science, in order to model perfect lossless compression in transformations acting on complete lattices. Starting from Janowitz’s characterization of resi...

Different countries issue an electronic passport embedding a contactless chip that stores the holder data (ePassport). To prevent unauthorized reading of the sensitive information present on such chip an access control mechanism based on symmetric cryptography, the Basic Access Control (BAC), has been introduced. In this work we present the flaws we have found out in some implementations of the...

This paper investigates the influence of the rotor structure on torque and flux weakening region of V-shape IPM (interior permanent magnet) machine from TOYOTA PRIUS type, more specifically, keeping always the same magnet volume, the effect of the open angle between the two magnet segments of each V-shape pole on the machine performance is studied. Moreover, in order to examine the impact of ph...

This paper proposes a novel dual-consequent-pole Vernier memory machine (DCP-VMM) featuring alternatively arranged NdFeB and low coercive-force (LCF) magnet poles on the rotating and stationary sides, respectively. Due to the presence of LCF magnets that can be repetitively magnetized or demagnetized via a simple current pulse, the extra-high torque density at low-speed, and excellent high-effi...

Variations of marine current speed can lead to strong fluctuations in the power extracted by a marine current turbine (MCT). During short-time period, swell effect is the main cause for the current speed variations. Conventional tip speed ratio Maximum Power Point Tracking (MPPT) algorithm will require the MCT to accelerate or to decelerate frequently under swell effect, which can cause severe ...