background preloader

Solar power without solar cells: A hidden magnetic effect of light could make it possible

Solar power without solar cells: A hidden magnetic effect of light could make it possible
A dramatic and surprising magnetic effect of light discovered by University of Michigan researchers could lead to solar power without traditional semiconductor-based solar cells. The researchers found a way to make an "optical battery," said Stephen Rand, a professor in the departments of Electrical Engineering and Computer Science, Physics and Applied Physics. In the process, they overturned a century-old tenet of physics. "You could stare at the equations of motion all day and you will not see this possibility. Light has electric and magnetic components. "This could lead to a new kind of solar cell without semiconductors and without absorption to produce charge separation," Rand said. What makes this possible is a previously undetected brand of "optical rectification," says William Fisher, a doctoral student in applied physics. Rand and Fisher found that under the right circumstances and in other types of materials, the light's magnetic field can also create optical rectification. Related:  `test 1021`test 1021

24 Terrifying, Thoughtful and Absurd Nursery Rhymes for Children In more repressed times, people were not always allowed to express themselves freely, for fear of persecution. Gossiping, criticizing the government or even talking about current events were often punishable by death. In order to communicate at will, clever rhymes were constructed and passed around to parody public figures and events. The first nursery rhymes can be traced back to the fourteenth century. While the Bubonic Plaque ravaged England, peasants used a rhyme to spread the word about equality. The "Adam and Eve" rhyme made peasants realize that they were important to the economy and contributed to the Peasants Revolt of 1381. Other nursery rhymes don't seem to carry a particular message at all, but convey a macabre sense of humor. Humpty Dumpty Humpty Dumpty sat on a wall,Humpty Dumpty had a great fall,All the King's Horses and all the King's menCouldn't put Humpty together again. In children's books, Humpty Dumpty is portrayed as a large egg, usually dressed like a little boy.

Software a confronto per sviluppare eBook in formato epub2, epub3 reflowable e fixed layout - Digital Index Editore Dettagli Categoria: servizi maggio 2014 Digital Index nel 2011 ha pubblicato il suo primo eBook (Parigi Sotterranea) in formato epub 2 e mobi. A maggio 2012 il primo Apple iBook (Guida al Parco archeologico e Museo all'aperto della terramare di Montale) e a marzo 2013 il primo ePub3 con video, formule matematiche e quiz (TRE IN UNO - Piccola Enciclopedia della Matematica Intrigante). Da allora la sperimentazione e lo sviluppo di queste nuove tecnologie continua, in particolare per la loro applicazione nelle collana Digital Docet dedicata ai libri di testo per la Scuola e la didattica scolastica. Ora sviluppiamo per altre case editrici sia eBook 2 che opere in epub3 fixed layout (libri per bambini e ragazzi) con funzionalità interattive e multimediali. Ci sembra giusto e opportuno condividere lo stato della sperimentazione. Ogni segnalazione di nuovi prodotti e sviluppi è ovviamente ben accetta e servirà a integrare le informazioni. Formati degli eBook nelle librerie digitali

Souto de Moura e il disegno “Bic/Bic/Bic – Bic Cristal – Nessuno disegna tanto per disegnare. Disegnare non è un hobby, disegnare, in Architettura, significa dover risolvere un problema. Gli architetti disegnano per dovere, non per piacere; come nella Scuola di Belle Arti, dove c’era un orario, un modello, un professore, e noi alunni chiusi tra i cavalletti. Disegnare, in Architettura, è correre contro il tempo, prendere ciò che sta a portata di mano: una scatola di fiammiferi, un biglietto del tram, un pacchetto di sigarette rovesciato, i sacchetti per il mal d’aria che si trovano in aereo, oppure il nostro quaderno, che non deve avere carta di pregio. La carta, se è di buona qualità, spessa, ci intimidisce, facciamo cerimonie, ci inibisce i gesti, e non è per la grammatura della carta che passiamo ai posteri. Anche la penna deve essere banale, leggera, anonima e disponibile in ogni angolo della città.

Alice's Adventures in Wonderland Background[edit] Page from the original manuscript copy of Alice's Adventures Under Ground, 1864 Alice was published in 1865, three years after the Reverend Charles Lutwidge Dodgson and the Reverend Robinson Duckworth rowed in a boat, on 4 July 1862[4] (this popular date of the "golden afternoon"[5] might be a confusion or even another Alice-tale, for that particular day was cool, cloudy and rainy[6]), up the Isis with the three young daughters of Henry Liddell (the Vice-Chancellor of Oxford University and Dean of Christ Church): Lorina Charlotte Liddell (aged 13, born 1849) ("Prima" in the book's prefatory verse); Alice Pleasance Liddell (aged 10, born 1852) ("Secunda" in the prefatory verse); Edith Mary Liddell (aged 8, born 1853) ("Tertia" in the prefatory verse).[7] The journey began at Folly Bridge near Oxford and ended five miles away in the village of Godstow. Synopsis[edit] Chapter Twelve – Alice's Evidence: Alice is then called up as a witness. Characters[edit] Symbolism[edit]

Starting With Nothing and Ending Up With Everything by Bruce Rawles Question: What's black and white and blinks in and out of existence 1044 (a lot) times per second? And is in every 1/1033 cubic centimeter of space (every teeny tiny bit)? Answer: Hey ... Everything! —W. Okay, it's time to dig down into the mental archives of your high school geometry class. If your geometry teacher was typical, the subject of the infinitesimal point was probably glossed over quickly to usher you into more "important" theorems and pragmatic applications. But let's hit the virtual PAUSE button on the subject of the point for a while, and give it the attention it deserves. The Infinitesimal Point A pure, ideal, mathematically pristine and glittering point occupies no space. Wait just a picosecond. If so, or even if you did boggle on it a while, let's explore the dimensionless point a bit further ... so you'll get my point ... about the point. Now that could come in handy. I've also found, to the delight of Ram Dass fans worldwide, that "here" appears to be quite portable.

Sephirot Sephirot (/sfɪˈroʊt/, /ˈsfɪroʊt/; Hebrew: סְפִירוֹת‎ Səphîrôṯ), meaning emanations, are the 10 attributes/emanations in Kabbalah, through which Ein Sof (The Infinite) reveals himself and continuously creates both the physical realm and the chain of higher metaphysical realms (Seder hishtalshelus). The term is alternatively transliterated into English as Sefirot/Sefiroth, singular Sephirah/Sefirah etc. Alternative configurations of the sephirot are given by different schools in the historical development of Kabbalah, with each articulating different spiritual aspects. The tradition of enumerating 10 is stated in the Sefer Yetzirah, "Ten sephirot of nothingness, ten and not nine, ten and not eleven". In Hasidic philosophy, which has sought to internalise the experience of Jewish mysticism into daily inspiration (dveikus), this inner life of the sephirot is explored, and the role they play in man's service of God in this world. Ten Sephirot[edit] Listings[edit] Description[by whom?] [edit]

Smokey Cheshire Cat Stop Motion: Tutorials 09 feb 2014 Esistono moltissimi video sul web che possono mostrarci in maniera molto 23 nov 2013 Will Harding, model marker della Aardman Studios, durante l’ExpoPixel del FFF di quest’anno ha 24 mag 2013 Con la clay painting si passa dal piacere tattile del mondo 07 ott 2012 Continuiamo ad esaminare le possibilità che una stop-motion offre attraverso l’esempio 23 giu 2012 Si effettua componendo tra loro dei ritagli di carta, stoffa o 19 giu 2012 In una claymation i personaggi sono realizzati in plastilina, a volte 16 giu 2012 All’interno del modello in plastilina è necessaria una struttura rigida che 14 giu 2012 Come ci suggerisce già il suo nome questa tipologia di stop-motion 12 giu 2012 Realizzare un’animazione è un modo articolato e stimolante per dare vita 10 giu 2012 Tecnica tipicamente usata per animare pupazzi, modellini, marionette o fantocci, provvisti 09 giu 2012 Pixilation La Pixilation è la tecnica che Meliès utilizzò per inaugurare i primi effetti speciali 25 mag 2012 26 apr 2012 30 mar 2012

Scrivere Architettura. Instabilità del “genere” e trivellazione della “forma” | alienlog Antonello Da Messina. San Gerolamo nello studio. 1474 – 1475 Intervento proposto nel corso del convegno “Presente Teorico condizioni e possibilità per una teoria dell’architettura” Una premessaIo penso che l’architetto debba includere nel proprio patrimonio di conoscenze, oltre agli aspetti tecnico-deontologici e scientifici, un vettore “critico” in grado di porlo in modo non incerto al centro delle questioni fondamentali della disciplina, alfine di acquisire una complessiva consapevolezza dell’importanza politica e culturale che ricopre nella società. Io penso infatti che l’abiura, il sofferto disincanto, lo scetticismo rassegnato che ha contraddistinto il modo di guardare all’architettura e all’identità professionale ed intellettuale dell’architetto negli ultimi anni, derivi dall’aver estromesso volontariamente l’istanza culturale, teorico-critica, dalla nostra ottica complessiva. Rachel Whiteread. Il progetto del “testo” o il testo come “progetto” Claude Nicolas Ledoux. Aldo Rossi.

I'll sing you one, O / Green Grow the Rushes, O I learned this song from my father, who grew up in Southern England, but I don't know who he learned it from. It is the best of the counting songs, of which he knew several, and which we as a family used to sing to while away the time on long car journeys. I know nothing of the origins of the song, although I would guess that it is very old - seventeenth or perhaps even sixteenth century. We do not even understand all the references. Some are clear enough, and we have guessed at others, but the rest have mystified my sister and me all our lives. Here is our provisional gloss: One is one, and all alone,[PARA]And ever more shall be so. With thanks to Veronica Biggs for her helpful suggestions, and a special thanks to Carl Olson for his definitive e-mail. I saw your gloss on this song and I must disagree with quite a bit of it. | Song Index | Home Page |

Scaling of Brain Metabolism with a Fixed Energy Budget per Neuron: Implications for Neuronal Activity, Plasticity and Evolution Abstract It is usually considered that larger brains have larger neurons, which consume more energy individually, and are therefore accompanied by a larger number of glial cells per neuron. These notions, however, have never been tested. Based on glucose and oxygen metabolic rates in awake animals and their recently determined numbers of neurons, here I show that, contrary to the expected, the estimated glucose use per neuron is remarkably constant, varying only by 40% across the six species of rodents and primates (including humans). The estimated average glucose use per neuron does not correlate with neuronal density in any structure. Citation: Herculano-Houzel S (2011) Scaling of Brain Metabolism with a Fixed Energy Budget per Neuron: Implications for Neuronal Activity, Plasticity and Evolution. Editor: Matjaz Perc, University of Maribor, Slovenia Received: November 1, 2010; Accepted: February 7, 2011; Published: March 1, 2011 Copyright: © 2011 Suzana Herculano-Houzel. Introduction

Sator Square The earliest datable square was found in the ruins of Pompeii which was buried in the ash of Mt. Vesuvius in 79 AD. Examples may be carved on stone tablets, or engraved into clay before firing as pottery. Translation[edit] Sator (from sero=to sow) Sower, planter; founder, progenitor (usually divine); originator Arepo unknown, likely an invented proper name; its similarity with arrepo, from ad repo, 'I creep towards', may be coincidental Tenet (from teneo=to hold) holds, keeps; comprehends; possesses; masters; preserves Opera (a) work, care; aid, service, (an) effort/trouble Rotas (rota) wheel, rotate; (roto) (I) whirl around, revolve rotate; used in the Vulgate Psalms as a synonym for whirlwind and in Ezekiel as plain old wheels. One likely translation is "The farmer Arepo has [as] works wheels [a plough]"; that is, the farmer uses his plough as his form of work. Appearances[edit] Anagram formed by the letters of the sator square Christian associations[edit] Magical uses[edit] See also[edit] [edit]

Related: