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Help link 27/04/2003; 16.46.15.


giovedì 28 novembre 2002
 

Economist di questa settimana ha uno speciale sulle armi biologiche. Brrr.

Dark Winter, a government study completed in June 2001 that modelled the effects of a smallpox attack on three American cities, concluded that within two months there would be 1m dead and twice as many infected.


10:08:12 PM      comment []

Cosmologia. Una fisica greca che lavora in Canada ( Fotini Markopoulou Kalamara, se volete telefonarle sulla pagina della facoltà c'è anche il telefono) è intervistata su scientific american perché sta lavorando ad una teoria del tutto, che unisce fisica quantistica e relatività.

La teoria si chiama Loop Quantum Gravity (LQG) ed è in diretta competizione con la teoria delle stringhe, che è la teoria del tutto più accreditata, ma presuppone cose un po' strane, tipo che ci siano 26 dimensioni e altre cose da pazzi. Ho trovato anche un sito dedicato alla gravità quantistica, con un saggio su LQG che fin dal primo paragrafo mi fa capire che non saprò mai cos'è:

Loop quantum gravity provides a general framework for diffeomorphism invariant quantum field theories, within which there is a complete quantization of Einstein's theory of general relativity. There is both a canonical and path integral formalism. In the canonical formalism the Hilbert space of spatially diffeomorphism invariant states has been constructed in closed form. Regularization procedures have been developed which result in finite, diffeomorphsim invariant or covariant operators which represent certain classical diffeomororphism invariant or covariant functions on the phase space. Among these are the area and volume operators, which turn out to have finite, computable spectra. These spectra have been computed in detail.

 light cones


9:48:36 PM      comment []

Vi prego fermatelo. Questo è Edo, il portiere della mia squadra di calcio amatoriale (mia nel senso che ci gioco), vestito da prete nella curva della Juventus, durante Juventus Bologna della settimana scorsa. Le sue parole:  "PREDICO LA FEDE ROSSOBLU...E TI DIRO' QUALCUNO HA ANCHE DETTO FORZA BOLOGNA! SONO IL NUOVO MESSIA DEL BOLOGNA!!!"

Oggi questa foto è sul Carlino. L'articolista, pietoso, ha nascosto la follia del gesto dietro improbabili messaggi di pace fra le tifoserie. Pare che Edo si presenterà in curva Laziale con amico nero al prossimo Lazio Bologna.

Per stavolta è sopravvissuto,  ma è una fortuna che potrebbe non ripetersi, specialmente coi laziali. Se conoscete un ultras intercedete per Edo, ha moglie e figli. E poi non para niente male.

Edo


2:06:53 PM      comment []

Una ricerca inglese (riportata dalla BBC) dice che la chi compra un collegamento "broadband", (tipo ADSL o Fastweb, da noi) non lo fa per la velocità, o per essere sempre collegato, ma per non avere l'ansia che ogni minuto che passa sono dollaroni per la telecom. Intuitivamente mi sembra molto giusto.

Ma allora perché qualche provider non offre un abbonamento ADSL a tariffa fissa, con banda strozzata ad una velocità appena superiore al modem (tipo 80Kbs), a tariffa molto bassa (per es. 19,90 /mese)?  Secondo me la farebbero in molti, poi chi ne ha bisogno pagherebbe il premio per la banda larga. Forse sono le tariffe che telecom fa agli altri provider a scoraggiare la cosa. Ma allora il garante? il ministro? (vabbè, il ministro è Gasparri, ritiro). Broadband's Unintended Consequences [Slashdot]


9:19:08 AM      comment []


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