Download Otter (Animal) by Daniel Allen PDF

By Daniel Allen

Even if hardly ever visible within the wild, the otter is favorite for its playful personality and swish aquatic agility, which have been verified within the well known mind's eye via books like Tarka the Otter and Ring of brilliant Water. This, even though, is simply a truly small a part of their story—throughout historical past the otter has additionally been largely searched for its fur and flesh. In Otter, human geographer Daniel Allen unearths how the animal's identification has been formed through this number of human interactions.

As Allen explains, otters, whereas feared by means of a few groups, have been hunted to close extinction through others—killed for his or her beneficial pelts within the north Pacific and chased with hounds for game in Britain. by contrast, Allen describes how local americans respected the otter and the way indigenous fishermen in components of Asia expert otters to help them. unfortunately, now all 13 species of otter are thought of threatened, and their survival is in no way certain.

during this wide-ranging examine the otter, Allen accommodates anecdotes from folklore, activities, well known literature, media, and conservation reports so that it will resolve this complex cultural heritage. Otter is a full of life e-book that gives a brand new state of mind approximately this fashionable and endangered animal.

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Reçus par les Annalen der Physik entre le 18 mars et le 30 juin, les quatre articles d'Einstein allaient transformer la physique dans les années à venir. Il est à remarquer qu'en 1905 il trouva aussi le temps et l'énergie de rédiger dans l'année vingt et un comptes rendus d'ouvrages pour la revue. Après coup, pour ainsi dire, puisqu'il n'en avait pas parlé à Habicht, il écrivit un cinquième article. Il contenait une équation que presque tout le monde finirait par connaître, E =mlf. «Une tempête se déchaîna dans mon esprit8 », ainsi décrivit-il le sursaut de créativité qui le consuma lorsqu'il produisit son époustouflante série d'articles, point culminant d'années de réflexion implacable, durant ces glorieux printemps et été 1905 à Berne.

Si la température double, alors la 34 LE GRAND ROMAN DE LA PHYSIQUE QUANTIQUE longueur d'onde «de pointe» sera la moitié de la longueur d'onde précédente. (nm) Figure 2: Répartition du rayonnement d'un corps noir montrant la loi du déplacement de Wien. La découverte de Wien signifiait que, une fois qu'on avait calculé la constante numérique en mesurant la longueur d'onde de pointe - celle qui correspond au rayonnement maximal pour une certaine température -, on pouvait calculer cette longueur d'onde de pointe pour toute température 35 • Ce qui expliquait aussi les couleurs changeantes du tisonnier porté «au rouge».

Après tout, ce que Planck venait d'avancer était encore une de ces formules ad hoc concoctées pour expliquer les résultats expérimentaux. D'autres avaient déjà proposé des équations de leur cru dans l'espoir de combler le vide au cas où l'incapacité annoncée de la loi de Wien dans les grandes longueurs d'onde venait à se confirmer. Le lendemain, Rubens rendit une nouvelle visite à Planck pour le rassurer. «Il est venu me dire qu'après la fin de la réunion il avait, le soir même, vérifié ma formule par rapport aux résultats de ses mesures, se souvint Planck, et avait trouvé une concordance satisfaisante en tous points46 • » Moins d'une semaine plus tard, Rubens et Kurlbaum annoncèrent qu'ils avaient comparé leurs mesures avec les prédictions de cinq formules différentes et avaient trouvé que celle de Planck était beaucoup plus précise que toutes les autres.

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