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Caiti A.,University of Genoa | Husoy T.,Kongsberg Maritime AS | Jesus S.M.,University of Algarve | Karasalo I.,Swedish Defence Research Agency | And 4 more authors.
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2012

The EU-funded project UAN - Underwater Acoustic Network aims at conceiving, developing and testing at sea an innovative and operational concept for integrating in a unique communication system submerged, surface and aerial sensors with the objective of protecting off-shore and coastline critical infrastructures. A crucial aspect of the project consisted in the use of autonomous underwater vehicles (AUVs) as mobile nodes in the underwater acoustic communication network. In particular, AUVs have the role of adapting the network geometry to the variation of the acoustic channel. This paper reports on the project concept and vision as well as on the progress of its various development phases. The recent at-sea successes that have been demonstrated within the UAN framework are detailed and results of the final UAN project demonstration, UAN11, held in the May of 2011, are reported. The UAN network was in operation for five continuous days with up to five nodes, of which three of them were mobile nodes. © IFAC.

Keranen K.,VTT Technical Research Center of Finland | Ollila J.,VTT Technical Research Center of Finland | Saloniemi H.,VTT Technical Research Center of Finland | Matveev B.,RAS Ioffe Physical - Technical Institute | And 7 more authors.
Procedia Engineering | Year: 2012

A novel portable methane sensor demonstrator based on Low Temperature Co-fired Ceramic (LTCC) differential Photo Acoustic (PA) cell, silicon cantilever and spatial interferometer was demonstrated. Silicon Micro-Electro- Mechanical-System (MEMS) cantilever-based PA technology allows sensing of extremely low gas concentrations with wide dynamic measuring range. The sensitivity enhancement is achieved with a cantilever microphone system in which the cantilever displacement was probed with an optical interferometer providing a pico-meter resolution. In the demonstrated gas sensor structure, the silicon cantilever microphone was placed in a two-chamber differential gas cell so that the achieved differential pressure signal was proportional to gas concentration in the open measurement path for gas flow. The pulsed optical power was produced by two Mid Infra-Red (MIR) Light Emitting Diodes (LEDs). The differential PA gas cell structure included two 8 mm cylindrical cells, diameter 2.4 mm, for reference and measurement detection portions coated with a silver paste. A transparent sapphire window was hermetically sealed on top of the differential gas cell structure in order to probe the displacement of the silicon cantilever inside the sealed differential cell. The sealed methane gas produced selectivity against other possible gases in the measurement path. The first sensor prototype sensitivity was 300 ppm with 1 s response time for the methane gas. Sensitivity is increased to be 30 ppm, when response time of 100 s is used. The selectivity in the demonstrated sensor is possible to tune simply by filling the differential cell with specific gas in focus and selecting corresponding LED with proper emission spectrum. Sensor concept provides possibility to measure extremely low gas concentrations of a wide range of gases having fundamental absorption bands at 3 - 7 μm wavelength range including CO, CO2 and CH4. © 2012 The Authors. Published by Elsevier Ltd.

Zhurbenko V.,Technical University of Denmark | Krozer V.,Goethe University Frankfurt | Kotiranta M.,Goethe University Frankfurt | Bouamrane F.,Thales Alenia | And 4 more authors.
Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011 | Year: 2011

In spite of the fact that the technology is constantly advancing, the realization of terahertz components is still heavily constrained by problems arising from technological limitations. As a result, the design of terahertz components still remains a challenging problem. In this work, an excitation problem of a terahertz double corrugation slow-wave structure is considered and practical realization of the structure using currently available technological processes is discussed. The parameters of the realized excitation structure are optimized for vacuum electronics applications while taking the technological constraints into account. © 2011 EurAAP.

Barigelli A.,Thales Alenia | Ciccognani W.,University of Rome Tor Vergata | Colangeli S.,University of Rome Tor Vergata | Colantonio P.,University of Rome Tor Vergata | And 8 more authors.
European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012 | Year: 2012

This paper deals with the development of GaN-based solution for X Band T/R Module of future SAR generations. In Particular HPA and LNA MMIC solutions have been investigated and produced using a 0,25 μm GaN HEMT process provided by SELEX-SI featured by a 4W/mm power density. Obtained results demonstrate promising performance both in Output Power and Noise characteristics and open the wider perspectives of medium-term GaN adoption in next generation SAR systems. The present work has been carried out in the frame of a general research and development activity sponsored by Italian Space Agency on the implementation of new technologies for next generation Spaceborn SAR. © 2012 European Microwave Assoc.

Ulrici A.,University of Modena and Reggio Emilia | Ulrici A.,Consortium for Science and Technology of Materials | Seeber R.,Consortium for Science and Technology of Materials | Seeber R.,University of Modena and Reggio Emilia | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

In the frame of the EU project CUSTOM, a new sensor system for the detection of drug precursors in gaseous samples is being developed, which also includes an External Cavity-Quantum Cascade Laser Photo Acoustic Sensor (ECQCLPAS). In order to define the characteristics of the laser source, the optimal wavenumbers within the most effective 200 cm -1 range in the mid-infrared region must be identified, in order to lead to optimal detection of the drug precursor molecules in presence of interfering species and of variable composition of the surrounding atmosphere. To this aim, based on simulations made with FT-IR spectra taken from literature, a complex multivariate analysis strategy has been developed to select the optimal wavenumbers. Firstly, the synergistic use of Experimental Design and of Signal Processing techniques led to a dataset of 5000 simulated spectra of mixtures of 33 different gases (including the 4 target molecules). After a preselection, devoted to disregard noisy regions due to small interfering molecules, the simulated mixtures were then used to select the optimal wavenumber range, by maximizing the classification efficiency, as estimated by Partial Least Squares - Discriminant Analysis. A moving window 200 cm -1 wide was used for this purpose. Finally, the optimal wavenumber values were identified within the selected range, using a feature selection approach based on Genetic Algorithms and on resampling. The work made will be relatively easily turned to the spectra actually recorded with the newly developed EC-QCLPAS instrument. Furthermore, the proposed approach allows progressive adaptation of the spectral dataset to real situations, even accounting for specific, different environments. © 2012 SPIE.

Calderisi M.,University of Modena and Reggio Emilia | Calderisi M.,Consortium for Science and Technology of Materials | Ulrici A.,University of Modena and Reggio Emilia | Ulrici A.,Consortium for Science and Technology of Materials | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The EU FP7 project CUSTOM (Drugs and Precursor Sensing by Complementing Low Cost Multiple Techniques) aims at developing a new sensing system for the detection of drug precursors in gaseous samples, which includes an External Cavity-Quantum Cascade Laser Photo-Acoustic Sensor (EC-QCLPAS) that is in the final step of realisation. Thus, a simulation based on FT-IR literature spectra has been accomplished, where the development of a proper strategy for the design of the composition of the environment, as much as possible realistic and representative of different scenarios, is of key importance. To this aim, an approach based on the combination of signal processing and experimental design techniques has been developed. The gaseous mixtures were built by adding the considered 4 drug precursor (target) species to the gases typically found in atmosphere, taking also into account possible interfering species. These last chemicals were selected considering custom environments (20 interfering chemical species), whose concentrations have been inferred from literature data. The spectra were first denoised by means of a Fast Wavelet Transform-based algorithm; then, a procedure based on a sigmoidal transfer function was developed to multiply the pure components spectra by the respective concentration values, in a way to correctly preserve background intensity and shape, and to operate only on the absorption bands. The noise structure of the EC-QCLPAS was studied using sample spectra measured with a prototype instrument, and added to the simulated mixtures. Finally a matrix containing 5000 simulated spectra of gaseous mixtures was built up. © 2012 SPIE.

Ulrici A.,University of Modena and Reggio Emilia | Ulrici A.,Consortium for Science and Technology of Materials | Calderisi M.,University of Modena and Reggio Emilia | Calderisi M.,Consortium for Science and Technology of Materials | And 5 more authors.
Lecture Notes in Electrical Engineering | Year: 2014

In order to efficiently detect four drug precursor molecules in presence of interfering species and background air, using a EC-QCLPAS sensor operating in the mid-infrared region, a complex strategy of spectral response simulation has been developed. In this context, spectra of gases from literature databases have been collected, denoised by means of the Wavelet Transform and mixed together according to a concentration matrix, which was specifically designed to represent a comprehensive combination of possible realistic cases. To scale database spectra to the appropriate concentration levels, an ad-hoc algorithm based on a sigmoidal transfer function has been used. In this way the baseline shape and intensity is preserved. Afterwards, a preliminary wavelength selection has been carried out to exclude noisy regions. The optimal range has finally been defined by maximizing the classification efficiency for all the target gases by means of Partial Least Squares-Discriminant Analysis. © 2014 Springer Science+Business Media.

Varriale A.,CNR Institute of Protein Biochemistry | Staiano M.,CNR Institute of Protein Biochemistry | Marzullo V.M.,CNR Institute of Protein Biochemistry | Strianese M.,CNR Institute of Protein Biochemistry | And 6 more authors.
Analytical Methods | Year: 2012

Ephedrine is a crucial chemical precursor for clandestinely produced amphetamine and its related drugs. Also, ephedrine is intentionally added to illegal preparations of methamphetamine or amphetamine because it is cheaper than the other two drugs. Consequently there is a pressing need to prevent the entry of ephedrine into commerce. Therefore the challenge calls for non-invasive techniques that provide data on the presence of ephedrine even in trace amounts. In this paper we describe the synthesis of a new ephedrine derivative with a carbon linker featuring an amino reactive group, and its conjugation to the glutamine binding protein (GlnBP) from E. coli as a carrier protein for the production of polyclonal antibodies against ephedrine. Proof-of-principle results of an efficient SPR-based indirect competitive immunoassay for the detection and quantification of ephedrine are presented. The detection limit of the assay was about 33 ng ml -1. © 2012 The Royal Society of Chemistry.

Di Giovanni S.,CNR Institute of Neuroscience | Varriale A.,CNR Institute of Neuroscience | Marzullo V.M.,CNR Institute of Neuroscience | Ruggiero G.,CNR Institute of Neuroscience | And 5 more authors.
Analytical Methods | Year: 2012

1-Phenyl-2-propanone (P-2-P), also known as benzyl methyl ketone (BMK), is a colorless or slightly yellowish liquid. It presents a density similar to that of water as well as a pleasant scent. Even if there are few legitimate uses of BMK such as in the production of the pharmaceutical drug propyl-hexedrine, most frequently BMK is used as an illicit compound for the illegal manufacture of amphetamine. Actually, BMK is identified by classical methods such as gas chromatography, NMR or HPLC. These methods are costly, time-consuming and require the presence of trained operators. It appears obvious that there is an urgent need to develop a new easy and fast method that allows us to detect the presence of traces of BMK. In this work, a new chemically synthesized BMK derivative covalently attached to an immunological carrier was used for producing antibodies against the BMK molecules. A fluorescence polarization-based bioassay was developed by using the produced anti-BMK antibodies and the BMK derivative. The assay exhibits interesting analytical performances with a limit of detection of less than 100 nM and an almost linear response up to 600 nM. Interestingly, the proposed assay could be performed using a customizable portable instrumentation and could be used by non-instructed personnel at custom borders and checkpoints or for quick spot-checks. © 2012 The Royal Society of Chemistry.

Marescialli L.,Selex SI | Perillo M.,Selex SI | Tarantino M.,Selex SI
IEEE International Symposium on Phased Array Systems and Technology | Year: 2010

The paper deals with the SELEX-SI Transmit/Receive Module (TRM) technology and related radar applications. Since the end of '90s SELEX-SI started its activities on the active technology, establishing a 20 years Road Map including GaAs and GaN components and evolving through the increase of effective generated power and efficiency, and sensors applications. The Road Map is comprehensive of a large frequency band interval, with specific attention to C and X band. As far as it concerns the G band radar sensor application of the active technology, this paper describes Selex-SI Active EMPAR (in the future named C-HOUND) and KRONOS radars. KRONOS and Active EMPAR are multifunctional, multirole G-Band radars based on Active Electronically Scanned Antenna (AESA). Active EMP AR is designed as a technologic upgrade of the SELEX Sistemi Integrati well proven EMP AR MultifUnctional radar system provided to the Italian and French Navies [1]. In this paper the two radar features will be detailed in terms of implemented technical and technological solutions and related advantages in surveillance, tracking and other functionalities required for a Combat System. © 2010 IEEE.

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