نتایج جستجو برای: sand hill
تعداد نتایج: 47195 فیلتر نتایج به سال:
Sand dripping in 1 dimensional Sand Pile Model is rst studied. Patterns and signals appear. Their behaviors and interactions are explained and asymptotic approximations are made. The total collapsing time of a single stack of sand is linear in function of the number of grains.
Curtis F. Jones,1 Charles Bernando,2 Rico Mayro P. Tanyag,1 Camila Bacellar,3,4 Ken R. Ferguson,5,6 Luis F. Gomez,1,* Denis Anielski,7,8 Ali Belkacem,3 Rebecca Boll,7,8,9 John Bozek,5 Sebastian Carron,5 James Cryan,3 Lars Englert,10 Sascha W. Epp,11 Benjamin Erk,7,8,9 Lutz Foucar,7,12 Robert Hartmann,13 Daniel M. Neumark,3,4 Daniel Rolles,7,9,12,† Artem Rudenko,7,8,† Katrin R. Siefermann,3,‡ Fa...
anxiety is one common disorder during childhood. in curing anxiety disorders, there are different types of psychological remedies, pharmotherapy, family therapy, and music therapy that can improve the individual’s anxiety, but we need some other remedies to improve social and emotional relationship and interactions. considering the importance of curing the anxiety disorders, the effect of sand ...
A new species of abertellid sand dollar, Abertella miskellyi n. sp., is described from the Miocene Camarones Formation of Patagonia, southern Argentina. The new taxon corroborates the existence of the genus in South America, given that Abertella is most common in the southeastern USA and the eastern coast of Central America. It is characterized by a unique basicoronal circle, in which the inter...
An experiment was carried out to assess the effect of four nitrogen levels viz. T1 (full doze of urea i.e. 215 kg urea ha-1 at 15 DAT), T2 (full doze of urea at two equal splits, ½ at 15 DAT + ½ at 30 DAT), T3 (full doze of urea at two equal splits, ½ at 15 DAT + ½ at 55 DAT) and T4 (full doze of urea at three equal splits, 1/3 at 15 DAT + 1/3 at 30 DAT + 1/3 at 55 DAT) on morpho-physiological ...
Tracks of mass unsted houtders are examined on the slope of a steep hill 3 km east of Peter and Paul in the southwestern desert of Egypt. The hill is what remains of a vol cania neck of trachytes and basal aonglomerates, The hill is surrounded by an apron of debris in which the tracks are grooved. One 2 m boulder left a straight trail and its motion appears to have been smooth. It continued to ...
Organisms with external fertilization are often sperm limited, and in echinoids, larger eggs have a higher probability of fertilization than smaller eggs. This difference is thought to be a result of the more frequent sperm-egg collisions experienced by larger targets. Here we report how two components of egg target size, the egg cell and jelly coat, contributed to fertilization success in a se...
to assess nickel-induced toxicity in plants, zea mays seeds were germinated and cultured on nutrient solution with nickel concentrations of 0, 50, 100 and 200 μm for a period of two weeks. its effects on the growth, hill reaction and photosynthetic pigments content were then investigated. the fresh and dry weight of leaves and roots increased in 50 μm nickel, but decreased in 100 and 200 μm. th...
Complex life cycles have evolved independently numerous times in marine animals as well as in disparate algae. Such life histories typically involve a dispersive immature stage followed by settlement and metamorphosis to an adult stage on the sea floor. One commonality among animals exhibiting transitions of this type is that their larvae pass through a 'precompetent' period in which they do no...
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