291 research outputs found
CHIMICA ANALITICA QUANTITATIVA di D.C. Harris. Seconda edizione italiana condotta sulla sesta edizione americana
No full textUno degli scopi fondamentali di questo libro, giunto ormai alle sesta edizione americana e tradotto in più lingue, è quello di presentare gli argomenti avvalendosi di esempi concreti, interessanti e di attualità. Finora era stata tradotta in italiano solo la seconda edizione americana (traduttrice L. Cioppettini, revisore M. Taddia, editore Zanichelli, 1991). La precedente edizione italiana è stata adottata in diverse Università. Il libro contiene ventinove capitoli, un glossario, una raccolta di note e bibliografia, nonchè una ricca appendice. Risulta ampiamente rinnovato ed aggiornato rispetto all'edizione tradotta in precedenza. Tratta sia i metodi classici di analisi e relativi fondamenti che i principali metodi strumentali. Questa edizione contiene un capitolo sulla preparazione del campione e uno sull'assicurazione di qualità, assenti in precedenza, ma assai utili nella moderna didattica della chimica analitica. Invoglia altresì all'uso del calcolatore, in quanto mostra come utilizzare i fogli di calcolo per la risoluzione di numerosi problemi. La bibliografia è aggiornata ai primi del duemila. Per rendere ancor più fruibile il testo dagli studenti italiani, sono state aggiunte numerose note espilcative
Analysis of Performance of Multicast Routing Protocols over 802.11b
No full textAbstract—In this paper we present a simulation study of the
performance of AMRIS and ODMRP multicast routing protocols,
in the presence of the rate adaptation mechanism of IEEE
802.11b MAC protocol. We have chosen these two protocols
because they are representative of the different multicast routing
strategies proposed in the literature, the tree-based approach and
the mesh-based approach. To evaluate the performance of these
protocols we have considered figures of merit like packet delivery
fraction and energy spent by the network
Principles of an Internet Voting System for Public Administrations
No full textThis paper describes the principles and the ideas
behind the Internet voting system designed by LepidaSpA. The
system is dedicated to Public Administrations and it was first
implemented for a referendum scenario. Afterwards LepidaSpa
developed a new version of the Internet Voting System in order
to meet the complex requirements of the elections made by
a LepidaSpA shareholder: the Land Reclamation Authority in
Italian Emilia-Romagna region. In order to provide security
and anonymity of votes operations, the system exploits three
fundamentals ideas: the system entities must be completely inde-
pendent and separate from each other; the use of asymmetric key
cryptography and the use of the token strategy. Furthermore, we
focus the attention on the the key concepts of our implementation
Energy efficient unicast routing protocols over 802.11b
No full textThe paper compares the performance of the AODV, DSR, OESR classic routing protocols for ad hoc networks, when an IEEE 802.11b MAC protocol is used. The investigation, performed by means of simulations, evaluates the energy efficiency of these protocols and the effect of the 802.11b rate adaptation capability on the performance. The paper evaluates the effectiveness of a distributed power control (DPC) scheme (P. Bergamo et al., 2002) applied to the classic AODV, DSR and OESR routing algorithms. The DPC scheme, acting both at MAC and network layers, has the aim to reduce the overall power consumption of the network. In particular, DPC evaluates, hop-by-hop, the suitable transmit power level and then selects, end-to-end, for any destination, the path which minimizes the total transmit power required. A final comparison between classic and DPC routing protocols is also reported
Architecture improvements for an efficient emergency network
No full textThis paper presents a modern and efficient architecture for an emergency tetra network working in the Italian Emilia-Romagna region. This network is by now fully working and serving the whole region area with an obsolete architecture so we describe the migration plan we are following in order to limit the breakdown and to guarantee better services while reducing the overall maintenance costs.This paper presents a modern and efficient architecture for an emergency tetra network working in the Italian Emilia-Romagna region. This network is by now fully working and serving the whole region area with an obsolete architecture so we describe the migration plan we are following in order to limit the breakdown and to guarantee better services while reducing the overall maintenance costs
Architectures for an efficient SMS Gateway service
No full textThis paper presents four alternative architectures that allows the implementation of a SMSGateway service, by pointing out the pro and cons of each solution. SMSGateway is a middleware service that allows the SMS sending and reception from an application point of view, ideal to let any software service able to automatically communicate to final users by means of the SMS channel, irrespectively from the GSM telecommunication provider that provide the SMS service. © 2015 University of Split, FESB
RECENT DEVELOPMENTS IN LAND TENURE LAW IN ERITREA, HORN OF AFRICA
No full textAfter a historical sketch of the evolution of land tenure systems in the Eritrean highlands, this paper describes the main features of the new Eritrean land law and its operative assumption that the legislation is meant to extend state control over land. The legal devices employed by the law are widely used in sub-Saharan Africa (and were largely inspired by colonial policies). The State of Eritrea frequently asserts that its recent independence gives it the opportunity to learn from other developing countries' mistakes and to avoid them. The basic patterns of the new land law, however, are common to the rest of Africa, notwithstanding the evident poor results. The central government wants its control to be widespread and pervasive. The fight against traditional social groups controlling land, at least in the highlands, is severe. Apart from a formal repeal of customary law, the state's acquisition of the power to modify village boundaries according to a scheme already completed at higher administrative levels and to introduce equal rights on land for women entails a disruption of the villages' social identity. Mandatory state control over landed property in Eritrea is, as usual, motivated by the necessity to address higher social needs. The ultimate intent, of course, is that the evolution from communal property to state property will eventually result in the widespread introduction of individual property once a sufficient level of economic development is achieved. This unfavorable attitude toward communal property is not supported by the evidence, which shows that, in fact, efficient land management can be obtained through renovation of traditional institutions.Land tenure -- Eritrea, Land tenure -- Government policy -- Eritrea, Land tenure -- Law and legislation -- Eritrea, Customary law -- Eritrea, Tenure types, Traditional -- Eritrea, Land reform -- Eritrea, Land Economics/Use,
Reliable Data Forwarding for Delay Constraint Wireless Sensor Networks
No full textMany applications for wireless sensor networks
require immediate and guaranteed actions; data have to be
transported reliably and in time through the network towards
the final sink. In this work we focus our attention on the control
of data transport delay and reliability in a multihop scenario. We
investigate and show some trade-offs between the delay and the
energy consumption required by cooperative and non cooperative
ARQ techniques. In particular we describe a mathematical model
to calculate the delay necessary to correctly deliver a packet to
the destination (sink) through the multihop path and we give close
form expressions for the delay in some particular topologies
Secure management of an Internet voting system: A case study for land reclamation authority
No full textThis paper describes the implementative aspects,
the main challenges and the adopted solutions for an Internet
voting system designed by LepidaSpA and dedicated for spe-
cific elections a Land Reclamation Authority in Italian Emilia-
Romagna region. Besides the description of the voting system,
we also present an efficient and simple administration tool for
the management of all the election phases, from the setup to
the scrutiny, that represents the essence of this paper as our
original contribution. Furthermore, we focus the attention on
the characteristics of our implementation in terms of security.This paper describes the implementative aspects, the main challenges and the adopted solutions for an Internet voting system designed by LepidaSpA and dedicated for specific elections a Land Reclamation Authority in Italian Emilia-Romagna region. Besides the description of the voting system, we also present an efficient and simple administration tool for the management of all the election phases, from the setup to the scrutiny, that represents the essence of this paper as our original contribution. Furthermore, we focus the attention on the characteristics of our implementation in terms of security
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