LL II PPPPPP AA LL II PP PP AA AA LL II PPPPPP AA AA LLLLL II PP AAAAAAAA LLLLL II PP AA AA
Lipa swiateczna
LIPA w hypertekscie: mosaic http://www.iopan.gda.pl/lipa.html
W dzisiejszym swiatecznym numerze:
--- WIELKI KONKURS na jubileusze LIPY
--- Jeden tekst ale za to w DWOCH jezykach. Podobno "Piwnica pod Baranami" spiewala to Papiezowi i sie wzruszyl.
Wesolych Swiat!
P.S. W nastepnym numerze - cegla.
Najmilsi. "Donosy" obchodza jubileusze systemem dwojkowym. T.j. numery 2, 4, 8, 16, 32, 64 ... sa jubileuszowe. Donald Knuth numeruje kolejne wersje swojego programu "TeX" przyblizeniami Pi. T.j. 3.14, 3.141, 3.1415, ...
Nie mozemy byc gorsi. Oglaszam WIELKI KONKURS na numeracje jubileuszowych numerow Lipy. Wygrana - Mercedes, ktory zostanie przeslany poczta. Oczywiscie numery jubileuszowe Lipy musza byc (1) zwiazane ze zjawiskami meteorologicznymi lub oceanograficznymi (2) monotonicznie wzrastac (t.j. nie mozna proponowac jubileuszowego numeru dziesiatego, dwudziestego, a potem czternastego).
Propozycje prosze wysylac do edytora 1) elektronicznie 2) z krotkim uzasadnieniem zjawiska/teoryi.
Ja (PJF) proponuje obchodzic jubileusze "Lipy" w.g. teorii Milutina Milankowitcha. T.j. co 22000, 41000, i 100000 lat. Ponizej, streszczenie teorii orbitali:
Theory of climate change,
which was developed in 1920 by Milutin Milankovitch, a Serbian
scientist, explains not only the Holocene recovery but also many of the
remarkable fluctuations of Pleistocene times. The theory is based on the fact
that the orbit of the Earth around the Sun varies in three ways. All of the
variations are small, but, especially when they reinforce one another, they are
sufficient to cause significant redistributions of solar heating
between latitude belts or hemispheres. Because the hemispheres differ greatly
in surface properties and heat storage capacity, these orbitally caused
variations in the pattern of solar heating are capable of changing global
climate. The three modes of variation are the obliquity, or tilt, of
the Earth's axis, which varies with an average period of about 41,000 years;
the precession of the equinoxes, which refers to the movement of
perihelion (the point when the Earth is nearest to the Sun) around the path of
orbit and which varies with a period of roughly 22,000 years; and the
eccentricity of the orbit, varying with a period near 100,000 years. Elaborate
mathematical analysis of these parameters has made it possible to calculate the
corresponding changes in solar heating of the Earth over the past 750,000
years.
These calculations show, for example, that over the past 18,000 years the amount of solar energy reaching the Earth in summer was concentrated in the Northern Hemisphere, reaching a peak of 40 watts per square metre above 1950 values between 12,000 and 9,000 years ago. This corresponded to an 8 percent increase in northern high-latitude summer heating, enough, it is believed, to account for the wastage of the Fennoscandian and North American glaciers (only Greenland's ice survives today). The winter cooling that compensated for the extra summer heat (orbital changes produce such seesaw effects) was most effective in the subtropical latitudes of the Southern Hemisphere. After 9,000 BP these trends reversed, and the modern world has a solar heating pattern much like that of the late Wisconsin maximum in 18,000 BP.
[Desiderata text removed due to claims of Mr. Robert Bell that he has international copyright for the poem - June 26, 1997]
[Tekst Dezyderaty usunieto na zadanie pana Roberta Bella, ktory twierdzi, ze ma do niego prawa autorskie - 24.06.1997]