Search Results

You are looking at 1 - 10 of 73 items for :

  • "transfer process" x
  • Refine by Access: All Content x
Clear All
Journal of Radioanalytical and Nuclear Chemistry
Authors: T. Muroyama, A. Shinohara, T. Saito, A. Yokoyama, K. Takamiya, S. Morimoto, K. Nakanishi, H. Baba, T. Miura, Y. Hamajima, T. Kaneko, H. Muramatsu, S. Kojima, and M. Furukawa

Abstract  

Annihilation γ-rays of π0 and pionic X-rays were measured in the gas mixtures of H2+Z and CH4+Z systems (Z=He, Ne, Ar and Kr). Pion capture probability of hydrogen atom was obtained from the annihilation γ-ray counts and the capture probability of Z atom was obtained from the pionic X-ray intensities. Transfer rates were determined from the data based on a combined large mesomolecular model. The transfer rates obtained were smaller than the systematics of the Russian group. Difference in the transfer rate between the gas and the liquid phases was found by a comparison of the present results with our previous ones.

Restricted access

Abstract  

The mechanism and kinetics of the excitation energy transfer were investigated. The rate constant of reaction /2/ and k3/k4 ratio were found to be in the range of the previously obtained values1,2. Additional evidence for formation of RHCl exciplexes was presented.

Restricted access

Abstract  

Temperature dependences of solubility, saturated vapour pressure and crystal heat capacity of [4-(Benzyloxy)phenyl]acetic acid were determined. The solubility of this compound was investigated in n-hexane, buffered water solutions with pH 2.0 and 7.4 and n-octanol. The enthalpy of sublimation and vaporization as well as the fusion temperature were determined. Solvation and solubility processes have been analyzed. The thermodynamics of transfer processes from one buffer to another (protonation process), from buffers to 1-octanol (partitioning process), and from n-hexane to the applied solvents (specific interaction) have been calculated and compared to those of other NSAIDs. The relevant shares of specific and non-specific interactions in the process of solvation have been investigated and discussed.

Restricted access

, alanine, and proline, while considering the transfer process. Conclusions The enthalpies of solution of l -proline in the mixtures of urea with water at m U = 0–6 mol kg −1 have been measured at 288.15, 298.15, 308.15, and

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Luiz K. C. de Souza, Juliana J. R. Pardauil, José R. Zamian, Geraldo N. da Rocha Filho, and Carlos E. F. da Costa

2 /g (MCM-41) to 681 m 2 /g (10CeMCM-41) due to an increase in the quantity of incorporated metal in the mesoporous structures. The thermal stability of the materials occurred at approximately 650 °C. The CeO 2 phase made the mass transfer process

Restricted access

oxidation of various ligands by VO 2 + in acidic aqueous medium consists of the formation of a transient species followed by an electron transfer process [ 9 – 12 ]. The presented spectral data undoubtedly confirmed the formation of a colored transient

Restricted access
Journal of Radioanalytical and Nuclear Chemistry
Authors: A. Shinohara, T. Muroyama, T. Miura, A. Yokoyama, K. Takamiya, T. Kaneko, T. Saito, J. Sanada, H. Araki, S. Kojima, Y. Hamajima, H. Muramatsu, H. Baba, and M. Furukawa

Abstract  

Pionic X-rays and π0 decays were measured for gas mixtures of H2/D2/CH4+SF6/Ar and the individual pure gases. Chemical effects on the pion transfer process from pionic hydrogen to other atoms were revealed by the pionic X-ray spectrum. The changes of the intensity patterns of pionic X-rays were compared with the predictions by a cascade calculation taking the transfer process into account. The mechanism of pion transfer process was discussed based on the results for gas phase and the previous ones for liquid phase.

Restricted access

Abstract  

Possibility of negative muon transfer from helium muonide He + to T /or D/ through collisional excitation after muon catalyzed fusion has been pointed out. The transfer process depends on the efficiency of collisional excitation of He + in the medium of tritium or deuterium. It is argued that tritium has larger nuclear stopping power and better excitation efficiency than deuterium. This effect is in the same direction as the tritium concentration dependence of muon loss probability in recent experimental work.

Restricted access

Abstract  

Pulsed source thermal lens measurement on CO2 and CO2/Ar, CO2/N2, CO2/CO gaseous mixtures are reported. A theory relating the thermal lens signal to the V-V and V-T energy transfer processes in the mixtures has been developed and applied to interpret the measurements. The occurrence of convergent and divergent thermal lens signals related to endothermic and exothermic effects in the gas have been quantitatively explained.

Restricted access