Magnetic shells

A word of warning should be inserted here with regard to the model used in all these calculations. The free electron methods treat the ring current as a line current in the carbocyclic skeleton, and it may be argued that the close agreement between the quantum mechanical methods and the (single) circular magnetic shell method with respect to the calculated chemical shift of benzene implies that the same criticism may be levelled at the non-classical methods (and is probably related to the effects of... 

Wang C, Zhang C, Li Y, Chen Y, Tong Z (2009) Fadle fabrication of nanocomposite microspheres with polymer cores and magnetic shells by Pickering suspension polymerization. React Funct Polym 69(10) 750-754... 

A new class of PS core/magnetite shell particles was produced by the sequential adsorption of magnetite nanoparticles and polyelectrolyte, a process that allowed the shell thickness and composition to be controlled with nanometer precision. The poly electrolytes were poly(diallyldimethylammonium chloride) or poly(allylamine hydrochloride). The influence of an external magnetic field on ordering of the composite PS core/magnetic shell particles was examined. 22 refs. 

In Figure 6.8 results are given for the magnetic shell structure of clusters. This results from the dependence of the magnetic moments /x, on the atomic environment. We use... 

In addition to tire standard model systems described above, more exotic particles have been prepared witli certain unusual properties, of which we will mention a few. For instance, using seeded growtli teclmiques, particles have been developed witli a silica shell which surrounds a core of a different composition, such as particles witli magnetic [12], fluorescent [13] or gold cores [14]. Anotlier example is tliat of spheres of polytetrafluoroetliylene (PTFE), which are optically anisotropic because tire core is crystalline [15]. 

Cobbers. Magnetic dmms used in cobbing services are designated to obtain maximum rejection of a nonmagnetic product and maximum recovery of the iron mineral. Typically, cobbers are appHed on a rod mill discharge product. Because the objective is to obtain maximum capacity, these dmms are 914 or 1219 mm in diameter and incorporate wear covers on the dmm shells to take the wear introduced by the relatively coarse feed size. 

Eermanent magnets for both the internal and external rotors, there is ss heat to the pumped fluid than with canned-motor pumps. Some canned-motor pumps have fully pressure-rated outer shells, which enclose the canned motor others don t. With magnetic-drive pumps, containment of leakage through the can to the outer shell can be a... 

CASE 9 USE OF MAGNETIC BEARINGS BY NORSKE SHELL IN AN ONSHORE APPLICATION... 

However, each application has its challenges. What made Norske Shell s application so different from other turboexpander units using magnetic bearings was the combination of power level and speed 6,000 kW (8,046 hp) on each shaft at 7,000 rpm, with typical pressures of 90 bar (1,305 psi). 

Because Norske Shell was using these turboexpanders in a dewpoint control process, it was necessary to factor in other specific conditions. For instance, these mrboexpanders could be exposed to possibly violent process transient conditions. For this reason, the magnetic bearings required a flux control system to increase the response capability, which was developed by the original equipment manufacturer in concert with the magnetic bearing manufacturer. The load factor of... 

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