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Full-Text Articles in Physical Sciences and Mathematics
An Alternate Solution To The Two-Dimensional Ising Model, B. Craig Meyers
An Alternate Solution To The Two-Dimensional Ising Model, B. Craig Meyers
Masters Theses & Specialist Projects
An alternate solution for the two-dimensional Ising model in a zero external magnetic field is presented. Following Kaufman, the partition function is written as the trace of a certain matrix product. The trace can be evaluated by computing the determinant of a related matrix. The determinant is evaluated by finding the product of its eigenvalues; in the thermodynamic limit the result is equivalent to that found by Onsager.
Ultraviolet Photosimulated Thermoluminescence Of Lithium Flouride, Martin Payne
Ultraviolet Photosimulated Thermoluminescence Of Lithium Flouride, Martin Payne
Masters Theses & Specialist Projects
TLD-100 (lithium fluoride) thermoluminescence dosimeters are widely employed for the detection of ionizing radiations. This paper shows that these dosimeters may also serve as practical germicidal ultraviolet radiation dosimeters. To measure ultraviolet radiation, the TLD-100 dosimeters are first exposed to 500,000 roentgens of gamma radiation and then annealed at 300°C. Subsequent dosage of ultraviolet radiation may be determined by observation of photostimulated thermoluminescence of the crystal. The presented data indicate that the thermoluminescence response is linear for exposures up to 6,000 µjoule/cm2 and independent of exposure rate from 0.1 µ watt/cm2 to above 50 µwatt/cm2. Optical …