Search results for "RAV"
showing 10 items of 5866 documents
Corrigendum to “Regular and singular pulse and front solutions and possible isochronous behavior in the short-pulse equation: Phase-plane, multi-infi…
2022
Section 7 of the original paper contained several errors which are corrected here. Equations (54) and (55) are incorrect. In the following, the corrected versions of these equations are given and the subsequent results of Section 7 are also revised.
An Investigation of the Robustness in the Travelling Salesman Problem Routes Using Special Structured Matrices
2020
In this study, the robustness of the Travelling Salesman Problem (TSP) routes is investigated by recognising the special combinatorial structures of Kalmanson matrices. A recognition algorithm encompassing three procedures based on combinatorial and linear programming (LP) is developed and executed on several randomly generated instances. These procedures produce three lower bounds which provide guarantees on the optimality of the solutions. Computational experiments show that the proposed LP-based procedure performs efficiently well across all problem dimensions and provides the best lower bounds to the TSP. This is supported by an average deviation of less than 7% between the TSP tour len…
A Battery-free Asset Monitoring System based on RF Wireless Power Transfer
2020
In the Internet of Things (IoT) era, asset monitoring represents an appealing implementation of Wireless Sensor Networks due to the enormous benefits associated with being able to monitor and record the exact position and transportation conditions of assets, personal objects, and the like. This kind of infrastructure enables the provision of increasingly advanced services, including the ability to measure the movement speed of a monitored asset using relatively inexpensive nodes with sensing capabilities and wireless transmission and reception. These nodes would ideally employ battery-free sensors that do not require any maintenance, but conventional power supply management systems cannot s…
Improved heuristics for the regenerator location problem
2014
Telecommunication systems use optical signals to transmit information. The strength of a signal in an optical network deteriorates and loses power as it goes farther from the source, mainly due to attenuation. Therefore, to enable the signal to arrive its intended destination with good quality, it is necessary to regenerate the signal periodically using regenerators. These components are relatively expensive and therefore it is desirable to deploy as few of them as possible in the network. In the regenerator location problem (RLP), we are given an undirected graph, positive edge lengths, and a parameter specifying the maximum length that a signal can travel before its quality deteriorates a…
An evaluation of the microscopical counting methods of the tape in hirst-burkard pollen and spore trap
1981
Abstract Three different sampling units in current use and different sampling strategies were tested. Randomly placed microscope fields are good in estimating the daily mean concentration, but very big sample size is needed. Traverses across the slide in systematic order are best to estimate the shortterm concentrations and diurnal variation. A formula for the estimation of the error in one transverse traverse is given. Twelve transverse traverses in systematic order is also enough to estimate the daily mean concentration. One or two traverses along the length of the slide give often unreliable estimates because of the irregularities in the transverse variation of the particle concentration…
Crisis and Opportunities Variables always Addressed Simultaneously in Effective Management
2013
Abstract Understanding the causes, duration and consequences of the crisis and the means to exit it are far from being regarded as sufficiently understood and operationalized. From the general components of the crisis, there was a necessity to be defined and managed separately the subjective component (disorientation, confusion) and the objective component, which are unequivocally different. They have to be operationalized into strategies, programs and tactical procedures to traverse and overcome the crisis with minimal loss. The paper also deals with the opportunities that crisis can create and with the measures necessary to identify and exploit these.
Nuovi ritrovamenti di resti di vertebrati nel travertino di Alcamo (TP).
2015
I depositi di travertino di Alcamo (TP) sono noti sin dal 1928 soprattutto per aver restituito resti dell’elefante di piccola taglia Paleoloxodon falconeri. Intorno agli anni ’80 nella cava di Contrada Cappuccini i lavori di coltivazione portarono alla luce una grossa frattura nel travertino. La frattura, riempita di un paleosuolo e chiaramente successiva alla formazione del travertino, conteneva un’associazione fossile caratterizzata dalla presenza di Paleoloxodon mnaidriensis. Il fatto che il paleosuolo contenga tali resti, assenti nel bancone di travertino caratterizzato invece dalla presenza dell’elefante di piccola taglia, costituisce un'inoppugnabile prova stratigrafica sulla successi…
Corporalidad y abyección en las crónicas de Pedro Lemebel.
2001
Artículo sobre las crónicas urbanas de Pedro Lemebel La esquina es mi corazón y Loco afán (Crónicas de sidario). Se analizan las representaciones de la ciudad y el cuerpo en los textos de Lemebel, poniendo el énfasis en los sentidos que da a los efectos del VIH en el cuerpo enfermo y en su reconceptualización de las identidades travestidas y mestizas.
Contribution and limitation of infrared spectroscopy technique to understand physisorption processes on MFI zeolites
2011
This manuscript is devoted to the study of adsorption processes by FTIR spectroscopy. The experimental results concern the adsorption of ethylene, trichloroethylene, tetrachloroethylene, sulfur hexafluoride or p-xylene on MFI zeolites, more especially on silicalite-1. The first step of the work was to develop a new experimental device and procedure in order to obtain reliable absorption infrared data and to improve results previously obtained by a prototype. The first main result is to characterize, maybe for the first time, the evolution of the spectrum of the adsorbent all during the adsorption process. Experiments reveal that the zeolite infrared spectrum undergoes strong modifications w…
Advanced Virgo Status
2015
Abstract The detection of a gravitational wave signal in September 2015 by LIGO interferometers, announced jointly by LIGO collaboration and Virgo collaboration in February 2016, opened a new era in Astrophysics and brought to the whole community a new way to look at - or “listen” to - the Universe. In this regard, the next big step was the joint observation with at least three detectors at the same time. This configuration provides a twofold benefit: it increases the signal-to-noise ratio of the events by means of triple coincidence and allows a narrower pinpointing of GW sources, and, in turn, the search for Electromagnetic counterparts to GW signals. Advanced Virgo (AdV) is the second ge…