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반강자성 CuFeS2-xSex의 결정학적 및 자기적 성질
김응찬 嶺南大學校 基礎科學硏究所 1997 基礎科學硏究 Vol.17 No.-
CuFeS???Se has been studied by Mossbauer spectroscopy and x-ray diffraction. The crystal is found to have a tetragonal structure and the lattice constants a? and c? increase linearly with increasing selenium concentration. It is noteworthy that the replacement of S by Se in the chalcopyrite decreases the strength of both the superexchange interaction and the interatomic binding. Isomer shift indicates a ferric character for the iron ions. The Debye temperature is found to be decreased with increasing selenium concentration.
김응찬 대한약학회 1971 약학회지 Vol.15 No.2
A water-soluble basic extract was obtained from Zizyphi spinosi semen and tested on its sedative and psychotropic activities. In a 2.2m $\times$ 2.2m $\times$ 0.8m open-field, the effect of the extract on unlearned emotional responses of mice was determined. Intraperitoneal injection of 5mg/kg, 10mg/kg, and 20mg/kg of the extract caused to show less often the frequency of ambulation, rearing and exploration and more the frequency of lying and sleeping than that of placebo control, meprobamate and chlordiazepoxide treated groups. In a standard shuttle box, the effect of the extract on learned emotional responses was determined. Intraperitoneal injection of 10mg/kg of the extract caused to show less conditioned response, secondary conditioned response and defecation than either placebo control or pre- and post-treated sessions with the extract throughout the acquisition and extinction of conditioned avoidance response. Intraperitoneal injection of 10mg/kg of the extract showed similar sedative actions with that of 1.25mg/kg of chlorpromazine. The extract shows major tranquilizer-like effect as chlorpromazine.
김응찬 嶺南大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.16 No.-
Stability of the properties of magnetite particles in novel medicinal magnetic ointments of multipurpose application has been studied with Mossbauer spectroscopy. Comparative analysis of the results obtained by model fitting of ?? nuclei spectra with those known for the system Fe₂O₄- r - Fe₂O₃ allowed to identify the phase composition of the particles. This composition, as well as that of the initial pure component in the form of a highly dispersed fraction (~??), differs noticeably from the stoichiometric one. Despite their small sizes, the particles exhibit no superparamagnetism (in the temperature range from 95 or 300K). Radiative sterillization of the ointments has no effect on the magnetic component composition.
김응찬 嶺南大學校 基礎科學硏究所 1997 基礎科學硏究 Vol.17 No.-
To determine whether there is an ionic substitution of Ni, Co, Mn, and Al for Fe in synthetic goethites these materials have been studied by Mossbauer spectroscopy at various temperatures. It is found that the presence of substituting elements in magnetically ordered structure of crystals may change the shape of Mossbauer spectra of these materials. The approximate distribution function of the effective magnetic field in the Fe nucleus p(Hn) was obtained from the Mossbauer spectra. It is noted that the mean value of p(Hn) and its integral width can be taken as a measure of substitution in goethites.
김응찬 嶺南大學校基礎科學硏究所 1999 基礎科學硏究 Vol.19 No.-
We used the discrepancy method to receive the quantitive information about the distribution function of the effective magnetic field H_n in Mo¨ssbauer spectroscopy. NiFe_2O_4 was used as a model object because of a priori known information about the desired function. To demonstrate discrepancy method ability in search for the distribution function of the effective magnetic field on nuclei we used data for the experimental spectrum of ^57Fe in NiFe_2O_4 a different parameters. An outstanding peculiarity of the discrepancy method, that if one intend to receive more detailed information about the distribution function the noise level will increase at a great extent, was manifested in the obtained results.