A comparison of the experimental cross sections of the (n, γ) reaction for several nuclei (103Rh, 127I, 181Ta, 197Au) with the compound nucleus model calculations has been made. In the formula used for the probability of gamma-ray emission from the compound nucleus, the presence of the well-known giant resonance was accounted for, as well as the presence of the "pigmy resonance" appearing at the energy Eγ ≈ 6 MeV. The agreement with the experimental values is better in this case than when the "pigmy resonance" is neglected. The same conclusions can be obtained from the calculations of the shape of the spectrum of neutron capture and from the Γγ/D ratio.
Hotz ats Roh-und Werkstoff 55 (]997) 395-398 :D Springer-Verlag 1997 theoretical temperature heatingThe paper presents a comparison of experimental and theoretical distribution of temperature in wood during microwave heating. Spruce samples were exposed to microwave radiation of 2.45 GHz frequency in a rectangular chamber. The temperature distribution on a cross section of the sample was determined several times per minute while the microwave energy was off. The more the water contained in the wood sample, the slower the rise of the temperature inside it. A theoretical temperature distribution was obtained based on the solution of Fourier's equation for the heat transfer. Experimental temperature distributions are in accordance with the theoretical ones.
Vergleich der experimente//en und theoretischen Temperaturteilung beim Mikrowellentrocknen von HolzDer Artikel entMlt einen Vergleich der experimentellen und theoretischen Temperaturverteilung bei der Mikrowellenerhitzung yon Holz. Fichtenholzbohlen waren in der Mikrowellenkammer Wellen mit der Frequenz 2.45 GHz ausgesetzt. Die Temperatur wurde etwa alle 60 Sekunden in den Erhitzungspausen auf der ganzen Dicke gemessen. Je feuchter die Probe war, umso langsamer stieg die Temperatur in ihrem Innern an. Die theoretische Temperaturverteilung wurde in Anlehnung an die Gleichung f/Jr W~irmetransport yon Fourier bestimmt. Die experimentelle Temperaturverteilung zeigt grofie Ubereinstimmung mit der theoretisch vorhergesehenen Verteilung.
IntroduaionThe theory of microwave heating has been developed for several years. Stuchly (1972) and Chen (1995) analysed the interaction of the thermal, mechanical and electromagnetic parameters of the body and the heating process. Chen additionally introduced several fundamental physical models for dielectrically-enhanced drying. Stuchly (1972) and Chen (1995) did not, however, analyse the temperature distribution during the microwave heating process. This paper presents a comparison between the experimentally determined temperature distribution and a theoretical one. In conventional drying methods, heat penetrates the material through its surface and diffuses inside. In the case of microwave heating the energy is
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