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"Makalah ini menampilkan analisa matematik pada bentuk semi tak hingga yang dibangkitkan temperatur osilasi dengan mengunakan modifikasi hukum Fourier tentang konduksi kalor atau lebih dikenal dengan persamaan konduksi kalor hyperbolik sebagai dasar perhitungan untuk menentukan termal difusivitas, waktu termal relaksasi dan termal konduktivitas secara simultan. Pada persamaan konduksi kalor hyperbolik atau juga bisa disebut persamaan tidak mengikuti Fourier mengasumsikan bahwa kecepatan rambat kalor di dalam medium adalah terbatas Solusi eksak dalam makalah ini dapat dijadikan dasar untuk merekayasa alat ukut baru yang dapat mengukur ketiga parameter tersebut.

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The presented paper is mathematical analysis on the semi-infinite body by applying hyperbolic heat conduction equation as a basic calculation to determine thermal diffusivity, thermal relaxation time and thermal conductivity. Hyperbolic heat conduction equation is called also as non Fourier equation, where in this equation is assumed that the heat propagation velocity is finite. Exact solution in this paper can be considered as a basic design for new experimental apparatus."

"ABSTRACTThe presented mathematical analysis on semi-infinite body for determination of thermal diffusivity and thermal conductivity of material is based on a theory originally stated by Angstrom. It applies a periodic (sinusoidal) temperature oscillation on the front side of a semi-infinite body. The temperature distribution in sample from the front side are sinusodial until the end of sample is oscillations as well, but have difference amplitude and phase. Depending on distance and angular frequency from the initial boundary, amplitude and phase in the body will be presented in 3 dimensional graphic. Both the amplitude ratio and phase shift permit to calculate the thermal diffusivity of the material.To determine thermal conductivity it can be calculated by adding a reference layer underneath the sample especially in semi-infinite body. The amplitude ratio and phase shift on both sides of reference layer indicate the heat flux entering the sample. Thus, if the thermal diffusivity and the thermal conductivity of reference layer are known, the thermal conductivity of sample can easily be obtained.In this paper, the proposed experimental apparatus of Angstrom method for measuring thermal properties of material which use Peltier-Element to generate temperature oscillation will also described."