Development of monitoring techniques by acoustical means for mechanical checkouts Final report, 15 May - 30 Sep. 1965

Automated pattern recognition devices using sonic signature data for detecting S3D and F-1 engine valve malfunction

Suitable classification of mortars from ancient roman and renaissance frescoes using thermal analysis and chemometrics

Background Literature on mortars has mainly focused on the identification and characterization of their components in order to assign them to a specific historical period, after accurate classification. For this purpose, different analytical techniques have been proposed. Aim of the present study was to verify whether the combination of thermal analysis and chemometric methods could be used to obtain a fast but correct classification of ancient mortar samples of different ages (Roman era and Renaissance). Results Ancient Roman frescoes from Museo Nazionale Romano (Terme di Diocleziano, Rome, Italy) and Renaissance frescoes from Sistine Chapel and Old Vatican Rooms (Vatican City) were analyzed by thermogravimetry (TG) and differential thermal analysis (DTA). Principal Component analysis (PCA) on the main thermal data evidenced the presence of two clusters, ascribable to the two different ages. Inspection of the loadings allowed to interpret the observed differences in terms of the experimental variables. Conclusions PCA allowed differentiating the two kinds of mortars (Roman and Renaissance frescoes), and evidenced how the ancient Roman samples are richer in binder (calcium carbonate) and contain less filler (aggregate) than the Renaissance ones. It was also demonstrated how the coupling of thermoanalytical techniques and chemometric processing proves to be particularly advantageous when a rapid and correct differentiation and classification of cultural heritage samples of various kinds or ages has to be carried out

ICONA: Inter Cluster ONOS Network Application

Several Network Operating Systems (NOS) have been proposed in the last few years for Software Defined Networks; however, a few of them are currently offering the resiliency, scalability and high availability required for production environments. Open Networking Operating System (ONOS) is an open source NOS, designed to be reliable and to scale up to thousands of managed devices. It supports multiple concurrent instances (a cluster of controllers) with distributed data stores. A tight requirement of ONOS is that all instances must be close enough to have negligible communication delays, which means they are typically installed within a single datacenter or a LAN network. However in certain wide area network scenarios, this constraint may limit the speed of responsiveness of the controller toward network events like failures or congested links, an important requirement from the point of view of a Service Provider. This paper presents ICONA, a tool developed on top of ONOS and designed in order to extend ONOS capability in network scenarios where there are stringent requirements in term of control plane responsiveness. In particular the paper describes the architecture behind ICONA and provides some initial evaluation obtained on a preliminary version of the tool.Comment: Paper submitted to a conferenc

Future-Viewer: An Efficient Framework for Navigating and Classifying Audio-Visual Documents

In this paper we present an intuitive framework named Future-Viewer, introduced for the effective visualization of spatiotemporal low-level features, in the context of browsing and retrieval of a multimedia document. This tool is used to facilitate the access to the content and to improve the understanding of the semantics associated to the considered multimedia document. The main visualization paradigm employed consists in representing a 2D feature space in which the video document shots are located. The features that characterize the 2D space's axes can be selected by the user. Shots with similar content fall near each other, and the tool offers various functionalities for automatically nding and annotating shot clusters in the feature space. These annotations can also be stored in MPEG7 format. The use of this application to browse the content of few audio-video sequences demonstrate very interesting capabilities

Comparison of Monomethylhydrazine/Hydroxypropylcellulose and Hydrocarbon/Silica Gels

Experimental studies have been performed to investigate rheology and droplet burning with different types of gelled propellants. Monomethylhydrazine has been gelled with organic hydroxypropylcellulose. JP-8 and RP-1 hydrocarbon gels have been produced with inorganic fumed silica particles. Rheological characterization showed the differences in terms of viscosity and yield stress behavior due to different types of gelling agents. Herschel-Bulkley and Carreau-Yasuda models have been used to characterize the gels with inorganic and organic gelling agents, respectively. First experiments with the Monomethylhydrazine/hydroxypropylcellulose gels showed a typical swelling process during combustion with a flexible viscous droplet surface. Contrary to that, the hydrocarbon/silica gels burned while a rigid silica structure was built, which remained unburned. Burning drop measurements have been compared to the d^2-squared law

Efectos del fósforo de un efluente cloacal sobre la morfología interna y externa de Eichhornia crassipes (Mart. Solms) en un humedal artificial

Se compararon las variaciones morfológicas que presentó Eichhornia crassipes (Mart. Solms) a la entrada y salida de un humedal construido para tratar un efluente cloacal. Se determinó la concentración de fósforo en el agua y en las plantas. Se midió la altura de las plantas, la longitud de las raíces y la biomasa. Para estudiar la morfología interna de la raíz se calculó el área transversal de la raíz (ATR), de la médula (ATM) y de los vasos metaxilemáticos tardíos (ATV) y el área total del metaxilema (ATVt) por sección. Las diferentes concentraciones de fósforo presentes en el efluente cloacal, a la entrada y salida del humedal, produjeron variaciones en la morfología externa e interna de E. crassipes. La concentración de fósforo en los tejidos mostró una relación directa con la concentración de fósforo en el agua. En las plantas de la entrada se observó una mayor altura, menor longitud y biomasa de las raíces en comparación con las plantas de la salida. En las plantas de la entrada se observó un aumento de los valores de ATM y ATV y ATVt, comparadas con las plantas de la salida. La variación en los parámetros morfológicos internos se debió probablemente al aumento del área transversal de la raíz.The present study compares the morphological variation of Eichhornia crassipes (Mart. Solms) between the inlet and outlet zones of a wetland constructed for the treatment of a sewage effluent. The phosphorus concentration in water and plants was determined. Plant height, root length and dry biomass were measured. The areas of cross-sectional whole root (ATR), stele (ATM), large metaxylematic vessels (ATV) and the total metaxylematic vessels (ATVt) were calculated. The different phosphorus concentrations registered at the inlet and outlet zones of the constructed wetland, induced internal and external morphological changes in E. crassipes. Phosphorus concentration in tissues was positively correlated with phosphorus concentrations in water. The inlet zone plants were taller and they had shorter roots and less proportion of root dry weight in comparison with the outlet zone plants. The inlet zone plants increased the ATM, ATV and ATVt values, in comparison with the outlet zone plants. The variation in the internal morphological parameters was probably due to the increase of the cross-sectional whole root