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How to catch scaling in geophysics : some problems in stochastic modelling and inference from time series
No full textDuring recent decades, there has been a growing interest in research
activities on change in geophysics and its interaction with human society.
The practical aim is to improve our capability to make predictions of
geophysical processes to support sustainable societal development in a
changing environment. Geophysical processes change irregularly on all
time scales, and then this change is hardly predictable in deterministic
terms and demands stochastic descriptions, or random. The term
randomness is usually associated to stochastic processes whose samples
are regarded as a sequence of independent and identically distributed
random variables. This is a basic assumption of classical statistics, but
there is ample practical evidence that this wish does not always become a
reality. It has been observed empirically that correlations between distant
samples decay to zero at a slower rate than one would expect from not
only independent data but also data following classical ARMA- or
Markov-type models. Indeed, many geophysical changes are closely
related to the Hurst phenomenon, which has been detected in many long
hydroclimatic time series and is stochastically equivalent to a simple
scaling behaviour of process variability over time scale. As a result, longterm
changes are much more frequent and intense than commonly
perceived and, simultaneously, the future states are much more uncertain
and unpredictable on long time horizons than implied by typical
modelling practices. The purpose of this thesis is to describe how to infer
and model statistical properties of natural processes exhibiting scaling
behaviours. We explore their statistical consequences with respect to the
implied dramatic increase of uncertainty, and propose a simple and
parsimonious model that respects the Hurst phenomenon. In particular,
we first we highlight the problems in inference from time series of
geophysical processes, where scaling behaviours in state (sub-exponential
distribution tails) and in time (strong time dependence) are involved.
Then, we focus on rainfall downscaling in time, and propose a stationary
model that respects the Hurst phenomenon. It is characterized by a simple
cascade structure similar to that of the most popular multiplicative
random cascade models, but we show that the latter simulate an
unrealistic non-stationary process simply inherent to the model structure
Gabayadii Xaaji Aadan 'Afqallooc'. Qaybta 2d
No full textBuuggani waa qaybtii labaad ee ururinta maansadii gabyaaga weyn Xaaji Aadan Afqallooc oo uu tiriyay 1970-73, kuna saabsan mawaadiic kala duwan oo la xiriira wadciga waqtigaas.Il volume raccoglie varie poesie del grande poeta Xaaji Aadan Afqallooc recitate negli anni 1970-73, e che affrontano vari argomenti relativi alle condizioni sociali di tale periodo.The volume gathers several poems by great poet Xaaji Aadan Afqallooc performed between 1970 and 1973 and dealing with several issues related to the social conditions in the 70s
Qamaan bulxan (taariikh iyo maanso)
No full textUrurintii labaad ee maansadii gabyaaga weynaa Qammaan BulxanRaccolta delle poesie del grande poeta Qammaan Bulxan.A collection of poems by the great Somali poet Qamman Bulxan
Chains of Poetic Debates
No full textIn this paper, the authors examine two contemporary chains of poetic debates, Siinley and Deelley, analysing their characteristics, their role in Somali oral literature and their contribution in exalting the social status of the 'jiifto' poetic genre.Qorayaasha qoraalkani waxay falanqaynayaan silsiladda suugaanta, Siinley iyo Deelley, iyagoo muujinaya dabeecadda labadan silsiladood iyo dowrka ay ku leeyihiin maansada soomaaliyeed ee casriga ah.In questo articolo, gli autori analizzano due catene poetiche contemporanee, la Siinley e la Deelley, illustrandone le caratteristiche, il ruolo nella letteratura orale somala e il contributo nella rivalutazione del genere poetico 'jiifto'
Mogadishu. Perla dell'Oceano Indiano. Pearl of the Indian Ocean
No full textGuida della città di Mogadiscio destinata al visitatore della capitale somala, contenente informazioni utili su servizi e attrezzature.Buug tusmabixiye ah, oo ku saabsan magaalada Muqdisho, oo loogu talaggaly dadka booqanaya caasiimida soomaaliyeed, wuxuuna xambaarsanyahay macluumaad waxtar u leh xagga adeega iyo saabaanka dalxiiska.Mogadishu guide-book meant for Somali capital city visitors, providing information about services and equipments
Raccolta di poesie: Xaaji Ahmed Fiqi 'Ilkadahab'
No full textITALIANOLa raccolta (1979-1980) è a cura del Prof. Francesco Antinucci e di Axmed Faarax Cali 'Idaajaa' che ne ha redatto le descrizioni e i commenti.Contenuto:Poesie classiche composte da Xaaji Ahmed Fiqi conosciuto con il nome di ‘Ilkadahab’. La registrazione si è svolta in un villaggio chiamato Gellinsoor, situato vicino Gaalkacyo. Le poesie sono recitate da Cabdirraxmaan Xaaji Gurxan e altri; alcune storie sul Sayid e il suo movimento derviscio somalo.AF SOOMAALIGAWaxxaa soo diyaariyay Prof. Francesco Antinucci (1979-1980), waxaana tifaftiray oo ka faallooday Axmed Faarax Cali 'Idaajaa'.Waxaa ku jira:Maansooyinkii hore ee uu curiyay Xaaji Ahmed Fiqi oo loo yaqaan ‘Ilkadahab’, oo lagu duubay tuulada Gelensoor oo u dhow Gaalkacyo, waxaa qaadaya Cabdirraxmaan Xaaji Gurxan iyo kuwo kale; waxaa kalo halkan ku duuban qaar ka mid ah tariikhda Sayidka iyo Daraawiishiisa.ENGLISHThe collection (1979-1980) is edited by Prof. Francesco Antinucci and Axmed Faarax Cali 'Idaajaa', the latter drew up the descriptions and comments.Contents:Classical poems by the Xaaji Ahmed Fiqi known as ‘Ilkadahab’. The recording took place at a village called Gellinsoor which is situated near Gaalkacyo. The reciter is the late Cabdirraxmaan Xaaji Gurxan and others; some stories about the Sayid and his Somali Dervish movement
Aakhiran ku haystaa!!
No full textBuuggani wuxuu ka mid yahay buugaagtii la qoray todobaatameeyadii, wuxuuna ka hadlayaa qiso jacaylIl testo, uno dei primi libri scritti negli anni 70, è un racconto d'amore.The text, one of the first books written in the 70s, is a romance
Radio Mogadiscio: Campagna di alfabetizzazione 2
No full textITALIANORaccolta di materiali diversi, curata da Abdirahman Mohamed Abtidon, relativi alla campagna di alfabetizzazione della lingua somala trasmessa da Radio Mogadiscio dal 1972 al 1974."Alifla kordhabay" è una canzone cantata da Maryan Cali Muuday e la compagnia artistica "Iftin", composta dal prof. Saciid Saalax, Sezione "Wadani Waxbarasho".AF SOOMAALIGAUrurin macluumaad kala duwan, oo uu soo diyaariyay Cabdiraxmaan Maxamed Abtidoon, oo ku saabsan ololaha farbarashada Af-soomaaliga, oo radio Muqdisho laga soo daayay muddada u dhexeysa 1972 ilaa 1974."Alifla kordhabay" waa hees ay qaadayso Maryan Cali Muuday iyo Kooxda Iftin, Ereyadii iyo Laxankii ustaad Saciid Saalax. Qaybta Wadani Waxbarasho.ENGLISHA collection of different materials, edited by Abdirahman Mohamed Abtidon, related to the literacy campaign of Somali language broadcast by Radio Mogadishu from 1972 to 1974."Alifla kordhabay" is a song played by Maryan Cali Muuday and the artistic company "Iftin", written by prof. Saciid Saalax, Section "Wadani Waxbarasho"
[Fotografie della Somalia: Riunione OCAM (Organisation commune africaine et malgache)]
No full textFotografie appartenenti alla collezione privata del Prof. Giulio Querini. Prof. Giulio Querini.Sawwirro ka mid ah kuwii uu si gaar ah uu ururiyay Prof. Giulio Querini.Photographs from the private collection of Prof. Giulio Querini
[Fotografie della Somalia: Riunione ambasciatori Paesi musulmani, luglio 1964]
No full textFotografie appartenenti alla collezione privata del Prof. Giulio Querini.Sawirradani waxay ka mid yihiin sawirraddii sida gaarka ah ee uu u uruuriyay Prof. Giulio Querini.Photographs from the private collection of Prof. Giulio Querini