Magnet fuse

Magnet Fuse (pronounced Fuzee). A medium power electric detonator, invented in 1854 by Abel, which was fired electrically. The original fuze contd a priming mixt of Cu20, Cu2S and K chlorate packed around the exposed wire leads, and a main charge of either mealed pdr or MF. 

The most widely used development in HTS wire production is tlie powder-in-tube procedure with BSCCO ceramic materials. In this procedure very fine HTS powder, placed inside of a hollow silver tube, is fused as the tube lengtn is mechanically increased to form a wire. Very high magnetic fields with this wire have been reported at 4 K however, the performance degrades substantially above 20 to 30 K. 

As is now common practice, H NMR spectra (NMR - nuclear magnetic resonance) have been recorded on most examples of the fused heterocyclic rings mentioned in later sections in this chapter, and as such the primary literature is replete with the data for these and should be consulted directly. 

Variable-temperature ESR studies have revealed large magnetic bistabilities in thiadiazole-fused 1,3,2-dithiazolyl 32 <2001SM1767, 2001MI451, 2002MI064434>, the thiadiazolopyrazine-fused 1,3,2-dithiazolyl 34, but not with the benzothiadiazolo-fused 1,3,2-dithiazolyl 33 <2004JA8256>. ESR studies have also been performed on inclusion crystals of the bicyclic [ 1,2,5]thiadiazolo[3,4-z/][ 1,3,2]dithiazol-2-yl 32 in channels of perhydrotriphenylene and tris(o-phenylenedioxy)cyclotriphosphazene <2002MI432>. 

Fig. 5. The /rSR spectra from fused quartz at room temperature and silicon at 77 K, each in a magnetic field of 10 mT. For quartz, the two high-frequency lines result from muonium with a hyperfine parameter close to that in vacuum. The two high-frequency lines in Si result from Mu, and their larger splitting arises because the hyperfine parameter is less than the vacuum value (0.45 Afree). The lowest line in each sample comes from muons in diamagnetic environments. The lines from 40 to 50 MHz in Si arise from Mu. From Brewer et al. (1973).

The (5,5) (2N2)-fused heterocyclic system contains three ring carbon atoms, one fusion carbon atom, and one additional nonfusion carbon atom in each five-membered ring. Only scattered H and 13C nuclear magnetic resonance (NMR) data are available for these systems. 

Tetranuclear manganese(III) carboxylate complexes have three different configurations for their metal centers fused open cubane, planar, or butterfly (see Figure 22). There is only one example of the first type namely [Mn4Q2(OAc)2(BSP)2] (105). The Mn Mn separations in (105) vary between 2.875(1)A and 3.122(1)A. Variable temperature magnetic measurements for (105) indicated weak antiferromagnetic interactions (/=—10.0cm and / = —3.7cm ) between the manganese(III) centers. Cyclic voltammetry of (105) in methanol shows one quasireversible oxidation wave at 0.01 V and two quasireversible reduction waves at about —0.4 V and —0.7 V vs. SCE. 

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