Ziff. 13. 41 Wir wollen das Problem folgendermaBen formulieren: Gegeben sei eine be- liebige physikalische Eigenschaft eines Kristalls beliebiger Symmetrie. Welche Bedingungen zwingt die Symmetrie des Korpers der betreffenden physikalischen Eigenschaft auf? Man braucht sich dabei keineswegs auf die Kristallsymmetrien zu beschranken. Die Unter- suchungen konnen leicht_auf Korper ausgedehnt werden, die durch irgendeine andere Gruppe von orthogonalen Transformationen in sich iibergefiihrt werden, die die Transformationen dieser Gruppe also als Symmetrieoperationen besitzen. Fiir uns ist nur der...
Ziff. 13. 41 Wir wollen das Problem folgendermaBen formulieren: Gegeben sei eine be- liebige physikalische Eigenschaft eines Kristalls beliebiger Symm...
71 For a given value of I the field is independent of the geometrical composition of the coil inside the winding space. The actual number of turns and the cross- section of the conductors is entirely determined by the impedance of the power supply to which the magnet should be adapted. In the case of low impedance (high current and low voltage) few turns of thick metal should be used. In the case of high impedance (low current and high voltage) many turns of thin material are needed. High impedance coils are made of square wire or flat strip wound into layers or "pancakes" 1. A nice system...
71 For a given value of I the field is independent of the geometrical composition of the coil inside the winding space. The actual number of turns and...
v. Formation of negative ions by processes other than attachment in the gaseous phase at low X/po 17. Introduction. As early as 1912, J. J. THOMSON 32J in his first mass spectro- graph observed negative ions of 0-, Cl-, H- and what he believed to be N-. He at first ascribed these to possible dissociation of polar gaseous compounds by electron impact but control studies using ionization at low energies in glow discharges indicated that this was not the origin. O. W. RICHARDSON 33J in his book on emission of electricity from hot bodies reported negative ions to come from hot salts. From there...
v. Formation of negative ions by processes other than attachment in the gaseous phase at low X/po 17. Introduction. As early as 1912, J. J. THOMSON 3...
will be "asymptotically integrable," that is to say, if we displace a vector parallel to itself along a closed curve whose total length is proportional to r, then, as we remove the curve to infinity, the change of the vector that results from the circuit about the curve will tend to zero. In the presence of gravitational radiation the total energy will not be con- served, because the waves carry some energy with them; analogous statements apply to the linear momentum, etc. But that is not all; if there is no coordinate 2 system in which the field strengths drop off as 1/r, then there is no...
will be "asymptotically integrable," that is to say, if we displace a vector parallel to itself along a closed curve whose total length is proportiona...
