Using a custom-FPGA architecture to extend the scale of atomistic magnetic spin simulations

New computational solutions are required to understand how atomic-scale properties affect magnetic behaviour at micrometer dimensions. We describe a field-programmable-gate-array (FPGA) based simulation of a dilute antiferromagnet with a large number of Ising spins using Glauber dynamics. The simple atomic model qualitatively reproduces experimental findings when scaled up to sufficiently large spatial dimensions, and provides insight into the finite size thresholds separating nanoscale from microscale behaviour. A real-time visualisation module was used to study the dynamics of the fractal domain structure and non-exponential relaxation mechanism. A performance comparison with contemporary GPU and CPU implementations suggests that a FPGA route is a competitive alternative.     

A convenient synthesis of bis(indolyl)alkanes under ultra sonic irradiation using silica-supported Preyssler nano particles

Bis(indolyl)alkanes have been synthesised in excellent yields in the presence of catalytic amount of silica-supported Preyssler nano particles as green, reusable and efficient catalyst under ultra sonic irradiation.     

正丙硫基芳氧基硫赶膦酰胺的合成

正丙硫基硫代膦酸酯类化合物具有较好的生物活性，其杀虫活性和杀螨活性尤为突出，八十年代以来国外已有商品化产品问世［１～３］。新近，美国氰胺公司还推出了一个含正硫基的有机膦酸酯类新品种ＢＡＳ－３０１，为广谱型杀线虫剂［４］。唐除痴研究小组报道了各种烷基硫...