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No full textImage taken from the website "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) and included in the Somali Archive with the permission of the owner of the collection, Mr. Davies.Sawirkan oo laga soo qaatay mareegta "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/), waxaa lagu biiriyay Kaydka Soomaaliya, kaddib markaa laga helay ruqsad miilkiilaha sawirrada, Mr. Davies.Immagine tratta dal sito "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) e inclusa nell'Archivio Somalia con il consenso del curatore della collezione Rick Davies
Mogadiscio – Una veduta della città dalla Cattedrale
No full textImage taken from the website "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) and included in the Somali Archive with the permission of the owner of the collection, Mr. Davies.Sawir laga soo qaatay mareegta "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/), waxaana lagu biiriyay Kaydka Soomaaliya, kaddib markii oggolaasho laga helay qofka diyaariyay oo ah Rick Davies.Immagine tratta dal sito "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) e inclusa nell'Archivio Somalia con il consenso del curatore della collezione Rick Davies
The Education of the Bravanese Community. Key issues of culture and identity
No full textExplanation of Bravanese education, step by step.Fasiraad ku saabsan waxbarashada Baraawaanka, oo tallaabo tallaabo ah.Illustrazione dell'educazione bravanese, per passi
[Geel V - Cammello V]
No full textOdayaashu waxay haasawahan kaga hadlayaan xoolaha, gaar ahaan geela, waxay abla-ablayn ku samaynayaan noocyada geela, iyagoo ka eegaya xagga degaanka uu ku noolyahay geela (deexda, bedka labada webi, buuraleyda), isla markiina tilmaamaya geela astaamihiisa iyo tayadiisa ugu doorka roon.In questa conversazione, gli anziani parlano del bestiame e in particolar modo del cammello: effettuano una classificazione secondo l'ambiente di crescita dell'animale (zone costiere, tra i due fiumi, montagna) indicandone le caratteristiche e qualità principali.In this conversation, the elders talk about livestock and camels, in particular: they classify them according to the natural environment in which they are raised (near the coast, the rivers, montainous regions), illustrating their main characteristics and qualities.Haasaawe badan oo laga duubay siddeetameeyadii odayaal ka shaqaynaayay Akadeemiyada Cilmiga iyo Fanka iyo Suugaanta ee Muqdisho iyagoo ka hadlaya hiddaha iyo dhaqanka ee bulshada soomaaliyeed.Registrazioni audio di conversazioni intercorse tra anziani dell'Accademia delle Scienze, delle Arti e della Letteratura di Mogadiscio negli anni '80, su temi relativi alla cultura e alla società tradizionali somale.Conversations between Elders of the Academy of Science, Arts and Literature on arguments related with Somali culture, society and traditions, recorded in Mogadishu in the 80's
Somalia - Modern photographs
No full textVideo edited by Centro Studi Somali for Expo Milan 2015, Somalia Pavillion.
Modern pictures related to agriculture made available by Maurizio Gigli, Maria Vittoria Giuliani, Stefano Scagnetti and pictures of domestic tools drew from the volume Aspetti dell’espressione artistica in Somalia (1987).Video-hani, oo Xarunta Cilmibaarista Soomaaliyeed ay u diyaarisay Expo Milano 2015, qaybta Soomaaliya, wuaxuu muujinayaa sawirro casri ah oo ku saabsan beerqodaalka, waxaana iska leh Maurizio Gigli, Maria Vittoria Giuliani, Stefano Scagnetti; waxaa kaloo raacsan sawirro agab oo laga dhexhelo buugga "Aspetti dell’espressione artistica in Somalia (1987)"Video realizzato dal Centro Studi Somali per Expo Milano 2015, Padiglione Somalia.
Fotografie moderne a tematica agricola, messe a disposizione da Maurizio Gigli, Maria Vittoria Giuliani, Stefano Scagnetti e fotografie relative agli utensili di uso domestico tratte dal volume Aspetti dell’espressione artistica in Somalia (1987).Link: https://youtu.be/YYLIwXg7EF
Merca - Missionari, i poveri
No full textImmagine tratta dal sito "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) e inclusa nell'Archivio Somalia con il consenso del curatore della collezione Rick Davies.Sawir laga soo qaatay mareegta "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) oo lagu biiriyay Kaydka Soomaaliyeed, iyadoo idin laga qaatay milkiilaha ururintaas oo ah Rick Davies.Image taken from the website "Mogadishu: Images from the past" (https://mogadishuimages.wordpress.com/) and included in the Somali Archive with the permission of the owner of the collection, Mr. Davies
Spaces of closure operations on rings and numerical semigroups
No full textA closure operation is a map c from a partially ordered set P to itself that veri es three
properties: it is extensive (that is, x c(x) for every x 2 P), order-preserving (if x y,
then c(x) c(y)) and idempotent (c(c(x)) = c(x) for every x 2 P). In this thesis, closure
operations are studied from a global point of view, that is, the focus is on whole sets on
closure operations de ned on sets of ideals or submodules, studying the cardinality of
certain sets of closures and the natural order-theoretic and topological structures with
which they can be endowed.
The rst chapter deals with star operations on numerical semigroups: in particular,
it is studied the problem of nding, given a positive integer n, the numerical semigroups
with exactly n star operations. It is proved that, for n > 1, there are only a nite
number of such semigroups, and an estimate for such number is given; these results are
proved by estimating the number of star operations through the other invariants of the
semigroup (like the multiplicity, the degree of singularity or the Frobenius number). It
is then determined explicitly the number of star operation on numerical semigroups of
multiplicity 3, and these results are partially extended to the set of residually rational
Noetherian domains whose integral closure is a ( xed, but arbitrary) discrete valuation
domain.
The second chapter is focused on the study of the topological structure of the set of
semistar operation on an integral domain: in particular, it is proved that some natural
subspaces of this set (for example, the space of nite-type semistar operations) are
spectral spaces, that is, they are homeomorphic to the prime spectrum of a commutative
unitary ring (endowed with the Zariski topology). Further objects of study are the sets
of stable, spectral and valutative semistar operations; results about these spaces are
then used to study subspaces of the space of overrings of an integral domain, especially
regarding the property of being a compact space, a spectral space or a proconstructible
space (that is, a closed set of the constructible topology). Particular spaces studied in
this way are the space of localizations of a ring and some of its generalizations (the space
of prime semigroups, the space of
at overrings and the space of sublocalizations).
1
The third chapter deals with the study of star operations on integral domains; in
particular, the focus is on the possibility of extending such closures on
at overrings of
the starting domain. It is proved that, given an integral domain D and a family of
overrings of D with some special properties (what is called a Ja ard familiy of D), the
space of star operations on D can be represented as the product (both in the topological
and in the order-theoretic sense) of the spaces of the star operations on T, as T varies
in . These results are then applied to the case of Pr ufer domains, obtaining (among
the other results) a representation on the class group of D relative to a star operation
through the class group of a subset (explicitly determined) of valuation overrings of D
Misure meccaniche tramite immagini ottenute in risonanza magnetica nucleare
No full textIl progetto di tesi di dottorato ha visto lo studio approfondito dei sistemi a Risonanza Magnetica. Tale studio è stato eseguito su più livelli, in modo da avere una conoscenza completa del sistema. In un primo momento sono stati approfonditi i principi fisici che sono alla base del funzionamento di tale sistema e si è analizzato il processo con il quale si viene a formare l’immagine passo dopo passo. Successivamente sono state analizzate ed approfondite le varie parti che compongono il sistema a risonanza magnetica responsabili della generazione del segnale, della sua ricezione, della sua manipolazione, elaborazione, produzione dell’immagine e rappresentazione della stessa. Infine sono state studiate le sequenze con le quali si ottiene un’immagine in Risonanza Magnetica, ponendo l’accento sulle differenze risultanti dall’immagine e sulle differenze sulla generazione del segnale che è alla base dell’immagine. La parte sperimentale ha invece visto un’analisi teorica preliminare che si poneva l’obiettivo di quantificare la visibilità della paraffina rispetto alla visibilità dell’acqua (materiale attualmente impiegato come riferimento per i quality test sia in fase di collaudo che di successiva manutenzione). Tale analisi è stata condotta sia su una paraffina di tipo commerciale, sia su due paraffine altamente raffinate che prendono il nome di Eicosane e Pentacosane. Successivamente è stato progettato un supporto meccanico, necessario per effettuare delle indagini sperimentali necessarie a verificare l’effettiva visibilità della paraffina sottoposta ad una scansione in Risonanza Magnetica. Il supporto meccanico consta di un case in perspex trasparente nel quale possono essere alloggiate un totale di sedici pipette in duran di quattro diversi diametri, sterilizzabili e riutilizzabili. Il case è stato progettato in modo da garantire il parallelismo tra le diverse pipette (ancorandole in due punti), e la stabilità alle piccole vibrazioni. Entrambi i materiali sono stati scelti perché trasparenti, resistenti e RM compatibili. Quindi, sono state svolte le prime indagini preliminari che hanno riportato risultati incoraggianti, utilizzando un protocollo di prove ridotto a sette test che impiegava sequenze Spin Echo pesate in T1, T2 e densità protonica. Sono state condotte analisi sul rumore di fondo, utilizzando due slices che non avevano alcun contributo informativo, e su parametri caratteristici dell’immagine, quali contrasto, rapporto segnale rumore e rapporto di visibilità paraffina/acqua. I risultati delle indagini preliminari si sono mostrati soddisfacenti nonostante la paraffina non risultasse visibile nelle sequenze T1 pesate. Per
tale ragione i campioni di paraffina sono stati ripreparati, sottoponendoli a successivi trattamenti termici in modo da scongiurare la formazioni di bolle d’aria in fase di solidificazione della cera di paraffina, che ne avrebbe potuto pregiudicare la visibilità. Con i nuovi campioni sono quindi stati ripetuti i precedenti sette test e sono stati confrontati i risultati, ottenendo dei miglioramenti in tutti i casi esaminati e la visibilità anche nelle immagini T1 pesate. Infine è stato sviluppato e validato un protocollo sperimentale più ampio. Tale protocollo consta di quindici test e impiega sequenze Spin Echo e Gradient Echo, pesate in T1, T2 e densità protonica. La validazione sperimentale del protocollo esteso è stata eseguita su due diversi sistemi RMN, ma solo uno ha prodotto le immagini desiderate. Il protocollo generale, ha permesso di confrontare sequenze di più breve durata e di impiegare un numero di NEX pari a due in alcune delle stesse, in modo da abbattere il rumore e massimizzare la visibilità dei target. Una validazione sperimentale su diversi sistemi è di sicuro interesse futuro.This doctoral thesis draft has seen a depth study of Magnetic Resonance systems. This study was performed on several levels, in order to have a complete knowledge of the system. In a first moment it was investigated the physical principles of this system, and it was also analyzed the process which forms the image step by step. Subsequently were analyzed and thorough the various parts that make up the system responsible for the magnetic resonance signal generation, of its reception, of its handling, processing, production of the image and its representation. Finally sequences that made an image in MRI were studied, with an emphasis on the practical differences and results from the image by the signal generation which is the basis of the image. The experimental part has instead seen preliminary theoretical analysis in order to quantify the visibility of paraffin respect to the visibility of water (currently material used as a reference for quality test both in a phase of initial test and maintenance). This analysis was carried out both on a commercial paraffin wax, and of two highly refined paraffins known as Eicosane and Pentacosane. Afterwards it was designed a mechanical support, necessary for carrying out the experimental investigations necessary to verify the effective visibility of the paraffin scanned in magnetic resonance imaging. The mechanical support consists of a transparent perspex case in which may be housed a total of sixteen duran pipettes of four different diameters, sterilizable and reusable. The case is designed to ensure the parallelism between the different pipettes (anchoring them in two points), and the stability to small vibrations. Both materials were chosen because transparent, resistant and MRI compatible. The first preliminary investigations that have reported encouraging results using a test protocol reduced to seven tests employing spin echo T1-weighted, T2 and proton density sequences. Test analysis were conducted on the background noise, using two slices that had no informative contribution, and on image parameters, such as contrast, signal to noise ratio and paraffin / water visibility. The results of preliminary investigations have been satisfactory despite the paraffin specimens are not visible in T1-weighted sequences. For this reason the paraffin samples were prepared again, subjecting them to successive heat treatments to avoid the formation of air bubbles during solidification of the paraffin wax, which could impair visibility. Other experimental trials were performed using the new specimens, achieving improvements in all cases and
visibility even in T1-weighted images, repeating the previous seven tests and comparing results. Finally it was developed and validated a wider experimental protocol. This protocol consists of fifteen tests and employs spin echo and gradient echo sequences, T1-, T2 and proton density weighted. The experimental validation of the extended protocol was performed on two different MRI systems, but only one has produced the desired images. The general protocol, allowed us to compare sequences of shorter duration and to employ a NEX number equal to two in some of the same, in order to reduce the noise and maximize the visibility of the target. An experimental validation of different systems is a secure future interest