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Ultrasounds (US) are a proven medical tool to assess a myriad of biological processes, including breast cancer screening, fetal development and blood flow. However, US also have the potential to deliver power and telemetry capability to deeply implanted devices, surpassing some challenges faced by coils or antennas operating inside the human body. In this study we present an implantable device powered...
Ultrasounds are a proven medical tool to assess some biological processes, including breast cancer screening, fetal development and blood perfusion. However, ultrasounds also have the potential to deliver power and telemetry capabilities to deeply implant devices, surpassing some of the challenges faced by coils or antennas operating inside the human body. In this paper, we present a small-form implantable...
This paper develops an iterative searching method to find the optimal power management strategy and component sizes for a hybrid power system that consists of a proton exchange membrane fuel cell, a chemical hydrogen production system, photovoltaic arrays, and a Li-Fe secondary battery set. In order to find the most suitable power management and component sizes, we build a MATLAB/SimPowerSystem simulation...
Active modulation of light with large optical bandwidths (∼100 nm [1]) is required in photonic devices, such as modulators for fiber communications [1] and saturable absorbers for ultrafast pulse generation [2,3]. Present modulators use expensive materials, (e.g. LiNbO3 [4], III-V semiconductors [5], and Ge on silicon-on-insulator (SOI) [6]), and are limited by narrowband operation (∼20 nm for quantum-confined...
A novel MEMS inertial switch with electrostatic force assistance and multi-step pull-in behavior has been designed, which can help the electrodes weaken the bounce and keep a long contact in the inertial switch before the leakage of electricity ends compared with the traditional rigid contact between electrodes. The dynamic switching and pull-in performance is simulated by finite element method. The...
This paper gives a research work in solving visual SLAM via a target-oriented tracking approach. The target-oriented tracking in this context refers to those object tracking approaches such as the well-known MeanShift but the approaches based on state-space or prediction are not included. The target-oriented tracking generally locks a dynamic or specific object which is not always available in a natural...
Wearable technology has become ubiquitous in recent years due to the miniaturization of circuit electronics and advances in smart materials that can conform to the requirements posed by the human body, behaviour and experience. Sensors of this type are found attached almost to every body segment, capable of delivering signals even in harsh activity scenarios. The reliability and relevance of the physiological...
Surface plasmon resonance has found plenty of sensing applications on various platforms from label-free biosensing to surface-enhanced spectroscopies. Quasiperiodic nanohole arrays with patterns such as the Penrose tiling have been demonstrated with surface plasmon resonance enhanced optical transmission. Here we transfer quasiperiodic nanohole arrays onto optical fibers and measure their optical...
The paper reports a novel inertial microswitch with multi-directional compact constraint structures for improving the shock-resistibility. Its shock-resistibility in the reverse sensitive directional ultra-high g acceleraiton (∼hunderds of thounsands) is simulated and analyzed. The dynamic response process indicates that in the designed inertial microswitch the proof mass weight G, the whole system...
This paper investigates the relative role of security standards, professional security certifications and technological tools in the protection of organizational data. Findings from the content analysis of 100 job postings for information security analysts and managers show that in general, organizations give more importance to knowledge validated by relevant professional certifications and to the...
Nanostructures, including nanowires, nanotrees, and membranes have potential applications in electronics, optoelectronics or solar cell applications. For example, the growth of branched nanowires (NWs) recently gained interest due to new developments in quantum optics and mesoscopic physics. Recent studies reported the growth of InAs and InSb NW networks that are the most promising material candidate...
Ultrasound imaging is a proven diagnostic tool to assess a myriad of physiological and pathological conditions in patients. Throughout the years, ultrasounds have been used as a passive recording modality where the backscattered echo arising from the interaction of the sound waves with the acoustic properties of the biological tissues helps to identify them. Apart from a wide range of therapeutic...
The resistive switching characteristics of single-crystalline CuO nanowires grown by thermal oxidation was investigated. Both stable unipolar resistive switching(URS) and an amazing bipolar resistive switching (BRS) phenomena were observed in the Cu/CuO-nanowire/Cu devices. The FE-SEM images of the device in high resistance state (HRS) were compared with its low resistance state(LRS). There was no...
Typing notification of instant messaging APPs improves user experience during online chatting. However, frequent notification leads to high energy consumption of mobile devices. In this paper, we study the trade-off between the frequency of typing notifications for user experience and communication energy saving of mobile device. We propose adaptive typing notification mechanisms, which exploit user's...
Based on a systematic literature review (hereafter SLR), this paper identifies the key themes and topics in cloud computing security. Findings from an analysis of 275 peer-reviewed publications show that cloud security solutions and cloud security challenges are the two most dominant themes. The other themes identified include guiding frameworks and methodologies and general security requirement....
We demonstrate timing jitter characterization of mode-locked lasers with attosecond-resolution using optical heterodyne techniques. The measured integrated jitter for a free-running mode-locked Er:Yb:glass laser was found below 20 as from 10 kHz to 5 MHz.
We present a novel radiation scheme with an electron beam travelling over a finitely thick slab made of negative-index materials. Such a scheme could start oscillating from Cherenkov radiation without external reflectors, since the electromagnetic energy flows backward inside the negative-index materials, leading to inherent feedback. We theoretically analyzed the mechanism of beam-wave interaction,...
The electric drive system is one of the most important parts of electric vehicles (EVs), whose function is the conversion between electric energy and mechanical energy. Switched reluctance motor (SRM) has the features of simple construction, high starting torque, wide speed range, high efficiency and high reliability which are appropriate for EVs drive system. Firstly, instantaneous torque control...
The far-infrared properties of a newly grown crystal, BaGa4Se7, were investigated with a THz-TDS system. Refractive indices and absorption coefficients of this material between 0.1THz-1THz were obtained. The measured properties predicts potential application of BaGa4Se7 in THz-DFG. THz-DFG using BaGa4Se7 was analyzed theoretically and the phase-matching conditions were calculated. It seems that a...
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