The effect of detachment and attachment to a kink motion in the asymmetric simple exclusion process

We study the dynamics of a kink in a one-lane asymmetric simple exclusion process with detachment and attachment of the particle at arbitrary sites. For a system with one site of detachment and attachment we find that the kink is trapped by the site, and the probability distribution of the kink position is described by the overdumped Fokker-Planck equation with a V-shaped potential. Our results can be applied to the motion of a kink in arbitrary number of sites where detachment and attachment take place. When detachment and attachment take place at every site, we confirm that the kink motion obeys the diffusion in a harmonic potential. We compare our results with the Monte Carlo simulation, and check the quantitative validity of our theoretical prediction of the diffusion constant and the potential form.Comment: 10 pages, 5 figure

Fabrication of Unglazed Ceramic Tile Using Dense Structured Sago Waste and Clay Composite

In Indonesia, the sago processing industry generates every year huge amount of sago waste, and converting this waste into a useful material is possible. In the present study, physical properties of dense structured sago waste and clay composite were investigated in order to study the feasibility of reuse this sample as raw material in the producing of ceramics. Firstly, the chemical composition of ash (obtained from the sago waste) and clay was characterized. The prepared sample was sintered at the temperature range from 800 to 1,200 °C using electric furnace. The density, linear shrinkage and water absorption of the sintered sample were determined by using the Archimedes' method. The experimental result indicated that the density of the sintered sample increased with increasing sintering temperature up to 1100 °C and then slightly decreased afterward. The water absorption of the products decreased with an increase in sintering temperature. In the sintered sample at 1,100 °C, the water absorption decreased rapidly and water adsorption of less than 1%was achieved. This water absorption was less than 5% which was needed for unglazed floor tile. The result of water adsorption suggest that it is possible to use this sample as a raw material for producing the ceramic floor tile

The first experiment of a THz gyrotron with a pulse magnet

A THz gyrotron with a pulse magnet has been designed, constructed and operated in FIR FU. It is developed as one of high frequency gyrotrons included in Gyrotron FU Series. The gyrotron has already achieved the first experimental result for high frequency operations whose radiation frequency exceeds 1 THz. In this paper, the design detail and the operation test results for sub-terahertz to terahertz range are described. The second harmonic operation is confirmed experimentally at the expected frequency of 1.005 THz due to TE_6,_11 cavity mode at the magnetic field intensity of 19.0 T

Development and research of X-band dynamic nuclear polarization system

In order to investigate the experimental technique and the high magnetic field effect in the dynamic nuclear polarization (DNP) experiments, the X-band 1H-DNP experiments have been performed on a organic solution of α ,γ-bisdiphenylene-β-phyenylallyl (BDPA) radical at room temperature. Because BDPA-doped toluene solution evaporated immediately during sub-THz irradiation, we tried DNP experiments with changing the solvent from toluene to benzene. As a result, we obtained similar DNP effects on the two solutions. We can expect that benzene solution is an appropriate sample for sub-THz DNP experiments. Further, we performed DNP measurements with degassed sample in order to avoid the relaxation due to oxygen in the sample solution. DNP enhancement observed in our measurements is well interpreted in terms of Overhauser effect