0000000000534756
AUTHOR
F. Mira
Computer-aided design of substrate integrated waveguide filters for microwave and millimeter-wave applications
In this paper, a Computer-Aided Design (CAD) tool of Substrate Integrated Waveguide (SIW) filters for high frequency applications is described. Some synthesis techniques are successfully combined with a fast and accurate full-wave analysis method, thus designing several practical examples of in-line and cross-coupled SIW filters. Prototypes have been manufactured and measured showing good results for different filter topologies. A novel zigzag coupling scheme is proposed for SIW compact filters in order to achieve very restrictive specifications of ultra-wideband (UWB) systems.
Efficient Pole Expansion of the Generalized Impedance Matrix Representation for Planar Waveguide Junctions
This paper proposes a novel pole expansion of the generalized impedance matrix representation for planar waveguide junctions. Proceeding in this way, we have obtained a very efficient algorithm for the accurate wide-band modelling of such junctions, since the most expensive computations are performed outside the frequency loop. For verification purposes, several practical examples are shown in order to prove the numerical efficiency and accuracy provided by this new technique.
Analisi biomolecolare di ceppi di Canine Distemper Virus (CDV) in furetti domestici (Mustela putorius furo)
L’agente eziologico del cimurro (CDV) appartiene alla famiglia Paramyxoviridae, genere Morbillivirus ed è causa di una patologia infettiva e contagiosa in canidi, mustelidi e procionidi. Gli Autori, descrivono un caso clinico di cimurro in due furetti domestici vaccinati con un ceppo Onderstepoort avianizzato. e la caratterizzazione biomolecolare del CDV isolato. I furetti presentavano un quadro clinico caratterizzato da dermatite pruriginosa e squamo-purulenta, alla regione del mento, peri-labiale, peri-vulvare ed al condotto uditivo esterno. I soggetti venivano a morte tre settimane dopo l’esordio dei sintomi. I campioni di croste prelevati sono stati sottoposti ad estrazione degli acidi …
Diagnosi di enteriti infettive di origine virale nel cane
Canine Viral Enteritis are widespread in farms and kennels. Responsible viruses are Parvovirus (CPV), Coronavirus (CCoV), Rotavirus (CRV) and Distemper Virus (CDV). Aim of this study was to assess their prevalence in Sicily and to characterize the strains isolated during 2009-2012. For this purpose, samples (stools, rectal swabs, intestine, liver, spleen, heart, lung, brain) collected from dogs were analyzed by PCR, RT-PCR and Real Time RT-PCR. Positive samples were processed for virus isolation on cell lines. Viruses isolated were analyzed by RFLP and sequencing for molecular characterization. Results show an high prevalence of CPV infection in dogs, followed by CCoV, CRV and CDV. CPV prev…
On the Fast and Rigorous Analysis of Compensated Waveguide Junctions Using Off-Centered Partial-Height Metallic Posts
In this paper, we present an efficient and rigorous method, based on the 3-D boundary integral-resonant-mode expansion technique, for the analysis of multiport rectangular waveguide junctions compensated with partial-height cylindrical metallic posts. The electrical performance of a great variety of commonly used wideband microwave circuits has been improved drastically thanks to the introduction of a new design parameter, i.e., the relative position of the metallic post in the structure. To the authors' knowledge, this parameter has not been taken into account in previous studies concerning compensated junctions using partial-height metallic posts. The developed tool has been successfully …
Evidenza di un caso di epatite infettiva del cane in Sicilia
L’Adenovirus Canino di tipo 1 (CAV-1), appartenente al genere Mastadenovirus, famiglia Adenoviridae, è l’agente causale dell’epatite infettiva del cane (ICH). Il virus replica negli endoteli vascolari e negli epatociti, causando epatite necrotico emorragica acuta. I sintomi neurologici sono rari e sono causati da una vasculite del SNC. Negli ultimi anni, la diffusa vaccinazione ha ridotto la circolazione di CAV-1 ed i casi clinici segnalati sono diventati rari ed isolati. In questo lavoro, gli Autori descrivono un caso clinico in un cucciolo di 2 mesi, non vaccinato, con febbre, prostrazione, convulsioni, vomito, diarrea ed esito infausto in una settimana. A seguito dell’esame autoptico, so…
Efficient CAD of Optimal Multi-Port Junctions Loaded with Partial-Height Cylindrical Posts using the 3D BI-RME Method
A rigorous full-wave technique based on the 3D BI-RME (Boundary Integral-Resonant Mode Expansion) method for the analysis and design of compensated waveguide junctions is presented. This method is used to investigate the electrical performance of right-angled bends and rectangular waveguide T-junctions loaded with partial-height cylindrical posts, with the aim of extending the typical usable bandwidths of such components. It is found that the electrical performance of a two-way power divider can be significantly improved by considering a post displaced along the symmetry plane of the structure. Therefore, this contribution reveals a new crucial design parameter not considered in previous wo…
Canine Mesenchymal Stem Cells from visceral and subcutaneuous adipose tissue for cell-based therapy
This study compared some characteristics of canine Adipose tissue-Derived Mesenchymal Stem Cells (cAD-MSCs) from subcutaneous and visceral fat. These findings were directed to obtain high quantity and quality cAD-MSCs for clinical cell-based therapy.
Wideband modeling of cascaded H-plane waveguide junctions using the generalised impedance matrix representation
A strong interest in H-plane waveguide components composed of a large number of cascaded planar junctions is recently renewed. Therefore, the more efficient development of full-wave analysis tools of such devices is again receiving consideration, specially for its potential use within modern design tools. A novel technique for providing the wideband generalised impedance matrix representation of the inductive devices in the form of pole expansions, thus extracting the most expensive computations from the frequency loop is proposed. For such purpose, the whole device is first decomposed into simpler building blocks, i.e. planar junctions and uniform waveguides, which are modelled in terms of…
Risultati di un test RFLP su ceppi vaccinali di Canine Distemper Virus in Italia
Canine Distemper (CD) is a highly contagious and multisystemic viral disease of domestic and wild carnivores. A published Restriction Fragment Length Polymorphism (RFLP) test, based on the presence of a PsiI cleavage site on hemagglutinin (H) gene, allows a rapid differentiation of all currently used vaccine strains by virulent field strains. The present study describes the results of this test carried out on different CD vaccines available in Italy in 2010. RFLP has also revealed that the CD strain present in the Vanguard (Pfizer Animal Health) vaccine reacts as a wild-type strain. Moreover, genetic analysis of H gene sequence has showed that Vanguard vaccine strain does not cluster in the…
Haemorragic syndrome in cattle by subgenotype BVDV-1h
Bovine viral diarrhoeaemucosal disease (BVD-MD) is caused by a Pestivirus. Two genotypes are recognized: BVDV-1 and BVDV-2. BVDV-1 causes diarrhoea, respiratory disorders and reproductive disorders. BVDV-2 causes a haemorrhagic syndrome. We describe several hypervirulent outbreaks characterized by severe haemorrhagic signs caused by BVDV-1 in Sicily.
Fast and accurate analysis and design of substrate integrated waveguide (SIW) filters
This paper describes the application of the boundary integral-resonant mode expansion (BI-RME) method to the accurate modelling of substrate integrated waveguides (SIW). The new formulation fully exploits the particular geometry of this class of structures, thus providing a very efficient analysis method to be used within CAD tools of SIW filters. The advantages of this method have been proved with the successful design of two filters operating in the microwave and millimeter-wave bands.
Efficient CAD of Generalized Coaxial Probes in Rectangular Waveguide using the 3D BI-RME Method
An efficient full-wave method based on the 3D BI-RME (boundary integral-resonant mode expansion) technique for the accurate design of generalized probe-excited rectangular waveguides is presented. The flexibility of the developed CAD tool allows to analyze two common configurations frequently used in modern coaxial-fed microwave devices: conventional and disc-ended coaxial probe excitation. This last configuration is used to drastically improve the electrical response of the classical coaxial probe excitation. Moreover, the influence of the distance from the probe to the waveguide shortcircuit is also discussed, and it is shown that it plays a very important role in the design of probe-exci…
Wideband impedance matrix representation of passive waveguide components based on cascaded planar junctions
[1] A very efficient technique for the full-wave analysis of passive waveguide components, composed of the cascade connection of planar junctions, is presented. This novel technique provides the wideband generalized impedance matrix representation of the whole structure in the form of pole expansions, thus extracting the most expensive computations from the frequency loop. For this purpose, the structure is segmented into planar junctions and uniform waveguide sections, which are characterized in terms of wideband impedance matrices. Then, an efficient iterative algorithm for combining such matrices, and finally providing the wideband generalized impedance matrix of the complete structure, …
Flexible and efficient computer-aided design tool for advanced comb-line rectangular waveguide filters
A very flexible and efficient computer-aided design CAD tool, specifically suited for advanced comb-line rectangular waveguide filters, is presented in this work. The developed software tool, which makes use of a full-wave analysis technique based on the Boundary Integral-Resonant Mode Expansion method, allows loading the considered comb-line resonators with any number of radially symmetrical partial-height metallic posts. The implemented CAD tool also allows dealing with coupling windows of arbitrary cross-section, thus drastically enhancing the flexibility of the CAD process. The excitation of the analyzed components, which is performed using generalized coaxial probes, has also been inte…