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A differential screw drive for microelectrodes is described, that can be used Nike Free Run 5 with skull chambers or with open tissue preparations. The instrument has a coarse movement providing displacement limited only by the length of the microelectrode, and a fine movement of 4 mm accurate to ± 1 μ. The principle and method of construction are described.
The local dipolar field produced by fluctuating Ising spins cannot change direction unless it is produced by two or more such spins. Nonetheless, I show that the change of orientation is independent of concentration in a dilute system. The implications fo for zero-field muon spin and NMR relaxation are discussed.
This paper discusses point-symmetric graphs which have a prime number of points. Isomorphism classes of these graphs are enumerated. It is shown that these graphs are characterized by the eigenvalues of their adjacency matrices. Finally it is shown hat point-symmetric graphs with a prime number of points are group-graphs.
We propose a new criterion of equity in the spirit of Foley's (1967) no-envy concept. We prove the existence of efficient allocations satisfying this criterion Nike Free Run 3 Hot Punch for a class of economies containing many for which envy-free and efficient allocations do not exist; when a large set of the latter exists, our criterion selects a small subset of it.