Information and communication technologies met a culminant evolution even since they appeared, with major achievements that became established in various fields of activity. Currently, one can notice an increased tendency to upgrade from classic computers to other types of equipment, much smaller in size, able to perform similar functions, such as PDA’s or mobile phones. Also, the expansion of ...

We show that Witt groups of spinor varieties (aka.\ maximal isotropic Grassmannians) can be presented by combinatorial objects called even shifted young diagram. Our method relies on the Blow-up setup Balmer-Calm\`es, and we investigate connecting homomorphism localization sequence via projective bundle formula Walter-Nenashev, projection Calm\`es-Hornbostel excess intersection Fasel.

this research was conducted at the department of horticluture, university of tehran during years 2005-2006, to investigate the use of iran apatite rocks in zeoponic substrate and as well to evaluate them as substitutes for phosphate fertilizers. five different substrates namely: m1: 89 wt. % soil+10 wt. % zeolite + 1 wt.% jeyrood apatite; m2: 82 wt.% soil + 15 wt.% zeolite+ 3 wt. % jeyrood apat...