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This study presents Shear Horizontal Surface Acoustic Wave (SH-SAW) sensors based on ink-jet printed poly (3,4-ethylenedioxythiophene) polystyrene sulfonate — multi wall carbon nanotubes (PEDOT:PSS-MWCNTs) and MWNTs-based inks as sensitive gas material. Experiments show the validation of the fabrication process of the acoustic platform and ink-jet printed sensitive layers. The characterization of...
This paper presents an inkjet printing capacitive microwave sensor for toxic vapor detection. The designed sensors were presented and fabricated with success. The experiments show sensitivity to ethanol vapor according to the S parameters. It is equal to 0.9 kHz/ppm and 1.3 kHz/ppm for the sensors based on 5 and 50 sensitive layers respectively. This sensor will be integrated into real-time multi-sensing...
As the cumulative length of electric cables in modern systems is growing and as these systems age, it becomes of crucial importance to develop efficient tools to monitor the condition of wired connections. Therein, in contrast to hard faults (open or short circuits), the diagnosis of soft-faults requires a particular effort. Indeed, these faults are more difficult to detect, yet they are sometimes...
We propose a software-based approach to provide an efficient way for designing unit cells based on the optimization algorithm and commercial electromagnetic software. Unit cells are comprised of discretely random lattice, square sub-blocks. The approach combined binary particle swarm optimization (BPSO) and CST Microwave Studio is used to achieve the optimal arrangement of the square metal sub-blocks...
This work focuses on the application related to the detection of low moisture and environmental pollutants. A novel gas sensor with inkjet printed Double Walled Carbon Nano Tubes (DWNTs) on a Love wave sensor platform was developed for Volatile Organic Compounds (VOCs) and humidity detection application. The experiments were conducted in real-time at ambient conditions. Results demonstrate the adsorption...
We present an electromagnetic energy harvester using rotational eccentric mass structure that generates power from extremely low-frequency motion of a driven mechanical swing-arm (i.e. pendulum) that is intended to mimic wrist motion during regular walking. It consists of two aligned eccentric rotors, which rotate together, containing multiple N52 permanent magnet pole-pairs with back iron shields...
The resistance of the BJT collector layer can be sharply reduced by the effective injection of minority carriers (holes) from base to collector. The conditions under which this process can occur are the short rise time and the high amplitude of the base pulse.
This study presents the results on the feasibility of a resonant planar chemical capacitive sensor in the microwave frequency range suitable for gas detection and for wireless communications applications. The objective is to develop a low cost ultra-sensitive sensor that can be integrated into a real time multi-sensing platform. The first demonstrators target the detection of harmful gases such as...
To ascertain flashover mechanism of the roof external insulation in high-speed airflow environment, breakdown characteristics and mechanisms of short needle-plate air gaps in high-speed airflow were investigated based on an artificial experimental wind-tunnel platform We obtained the breakdown characteristics of the air gaps in wind sand environment by studying the influences of sand mass concentration,...
By means of comprehensive first-principles calculations, we investigate the stability and electronic properties of AlAs/germanene heterostructures. Especially, electric field and strain are used to tailor its electronic band gap. The binding energy and interlayer distance indicate that germanene and AlAs monolayers in AAI pattern are bound together via van der Waals interaction with a maximum indirect-gap...
This paper proposes the use of Ultra-Wide Band (UWB) technology to detect falls in smart home environment. A bi-static setup is proposed in which the UWB sensor including both transmitter and receiver is mounted over the ceiling to monitor and detect falls among other types of inertial movements such as slow/fast walking and lying down. The experimental results show that the proposed approach can...
A local error method with semi-analytically pre-calculated step-sizes is proposed for the simulation of polarization multiplexing signal propagation through the single mode optical fiber. The method leads to efficient and reliable numerical performance.
We used optical-pump, terahertz-probe spectroscopy to track carrier dynamics in a two-dimensional electron gas under a magnetic field, revealing photoinduced changes to the cyclotron frequency and scattering time, along with an unexpected higher frequency mode.
This work reports a thin-film supercapacitor featuring advanced electrode and electrolyte materials and the capability of integration on SiO2/Si substrate. Conventional supercapacitors see their limit including low effective surface area electrode, low voltage-tolerance electrolyte, and bulky size. This work addresses these issues by the following novelties: 1) spray-coated rGO electrode layer with...
Following the exponential deployment of surveillance systems across a wide-spread region of geographic locations, detection and representation of events has become a critical element in automated surveillance systems. In this paper, we present an extensive ontology framework for representing complex semantic events. The proposed ontology builds on DOLCE ontology and relies on the linguistic and cognitive...
In this paper, we present a multiband ultra wideband (UWB) system design to realize the interference suppression and improve the bit transmission rate. With reasonable division of the UWB bandwidth, the multiband UWB scheme can improve the spectrum utilization and also the bit transmission rate through the utilization of the multiple frequency bands to transmit the information bit simultaneously....
Super-resolution microscopy such as STED [1, 2], SSIM [3], or PALM/STORM [4] placed their respective critical requirements on the fluorescent labeling, thereby limits their applications in biology. Polarization as the fourth dimension of fluorescence can also provide intensity modulation, yet without the restriction to specific fluorophores. Here we present a new technique termed super-resolution...
In our previous work, we use accidental degeneracy to realize conical dispersions at Γ point (k = 0) in two-dimensional (2D) photonic crystals (PCs) [1]. The conical dispersion consists of a triply degenerate state with two linear bands touching at the Dirac-like point and an additional flat band intersecting it at the same frequency. If the conical dispersion is derived from monopole and dipole excitations,...
Non-Hermitian systems, such as open systems and systems with asymmetric losses, are ubiquitous in nature and have drawn a lot of attentions for a long time. The exceptional points (EPs) that can exist in such systems when two eigenstates coalesce are the origin of a wide range of novel phenomena in different branches of physics. Most of these phenomena can be understood by considering a 2 × 2 non-Hermitian...
Additive manufacturing (AM) provides an opportunity to a new design concept in which the manufacturing constrain is released. The engineering design and optimization can include part building parameters to take the advantages of additive manufacturing or 3D printing technology. This paper presents a robotic additive manufacturing process simulation method which pushes one step further in the direction...
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