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Development of concentration-separation method for a trace amount of antimony in waste water from polyester production using manganese dioxide uniform precipitation method
No full textIn Japan, the environmental regulation value on antimony in river water is not decided, but the pollution of the river by the antimony in waste water, which drained from polyester production, becomes the problem now. To a sample solution containing a trace amount of antimony, the solution of manganese sulfate, potassium permanganate and sulfuric acid were added, and then the uniform precipitant of manganese dioxide occurred in the solution. The precipitant obtained by this method strongly adsorbed antimony in comparison with the commercial powdery manganese dioxide. Because the precipitant could be easily dissolved with nitric acid and hydrogen peroxide, the atomic absorbance of the antimony contained in the solution were measured. The recoveries of antimony from 50 to 1000 ppb were approximately 100% by repeating this uniform precipitation method twice. The
proposed method was successfully applied to the determination of trace amount of antimony in waste water samples
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No full textIn this paper, we consider a joined structure in which a long plate is sandwiched between two short plates, and we investigate the effect of the size of an overlapping region, i.e., the short plate length, on damping characteristics. For this, we calculate energy dissipation due to friction at the contact interface, which produces damping, using static contact analysis. In the contact analysis, a surface load is applied at the contact interface and then a distributed forced displacement is applied. For the distributed displacement, mode shape is used to estimate the modal damping ratio for each mode. The results show that the dissipated energy increases with short plate length for all modes, though this increase differs between them. This indicates that the modal damping ratio depends on both the short plate length and the mode. This is explained by changes in the slip displacement and contact force with the short plate length for each mode
Rectified Proton Grotthuss Conduction Across a Long Water-Wire in the Test Nanotube of the Polytheonamide B Channel.
No full textA hydrogen-bonded water-chain in a nano-tube is highly proton conductive, and examining the proton flux under electric fields is crucial to understanding the one-dimensional Grotthuss conduction. Here, we exploited a nano-tube-forming natural product, the peptide polytheonamide B (pTB), to examine proton conduction mechanisms at a single-molecule level. The pTB nano-tube has a length of ~40 Å that spans the membrane and a uniform inner diameter of 4 Å that holds a single-file water-chain. Single-channel proton currents were measured using planar lipid bilayers in various proton concentrations and membrane potentials (±400 mV). We found, surprisingly, that the current–voltage curves were asymmetric with symmetric proton concentrations in both solu-tions across the membrane (rectification). The proton flux from the C-terminal to the N-terminal end was 1.6 times higher than the opposite. At lower proton concentrations, the degree of rectification was attenuated, but by adding a pH-buffer (dichloroacetate) that supplies protons near the entrance, the rectification emerged. These results indicate that the permeation processes inside the pore generate the rectification, which is masked at low concentrations by the diffusion-limited access of protons to the pore entrance. The permeation processes were characterized by a discrete-state Markov model, in which hops of a proton followed by water-chain turn-overs were implemented. The optimized model revealed that the water-chain turnover exhibited unusual voltage dependence, and the distinct voltage-dependencies of the forward and backward transition rates yielded the rectification. The pTB nano-tube serves as a rectified proton conductor, and the design principles can be exploited for proton-conducting materials
The issue of the London Naval Disarmament and Hiranuma Kichiro
No full textHiranuma Kichiro engaged in political maneuvering to get the position of the Prime Minister in the 1930s. This shows that he began to shift his political base away from the Privy Council. This article traces the background of Hiranuma's political maneuvering in the 1930s to the
issue of the London Naval Disarmament. It is believed that Hiranuma abandoned political activity based on the Privy Council after its defeat of the Hamaguchi Osachi Cabinet. However, although the Privy Council had won against the Cabinet, Hiranuma couldn't have controlled the
military authority, which was a central political issue in the 1930s. So Hiranuma, either way, must have shifted the political base from the Privy Council. The issue of the London Naval Disarmament isn't the beginning of Hiranuma's political change, but is material from which to extract his political attitude.
The first section of the article points out that, in order to solve a political problem, Hiranuma did not strengthen the power of any organization, but rather concentrated on strengthening personal authority importance. Part two focuses on the issue of the infringement of the
supreme command, demonstrating that Hiranuma tried to check the centralization of power in the Cabinet, and revealing his political posture to be a strong opposition to the reorganization of the divided governing structure
Chemical study for the wood biomass waste "Woody Pitch"
No full textAt the resources circulation type biomass power station, wood tar called the "Woody Pitch" is exhausted as a residual material. When this Woody Pitch is used for a road repair agent as an asphalt
substitute, inspection whether or not this Woody Pitch maintained the safety for human as materials was necessary. Hence, for Woody Pitch, four composition（asphaltene, resin, aromatic series and saturated fat）analyses, the degradation level by light irradiation, the analysis of the low boiling point material by the GC/MS and the toxicity test by the variability were performed . The Woody Pitch includes a lot of asphaltene in comparison with straight asphalt and includes saturated fat
and aromatic series in small quantities. When the straight asphalt deteriorates, saturated fat and aromatic series decrease and asphaltene increase. Therefore the Woody Pitch resembles an ingredient
when normal straight asphalt deteriorated, it is thought that the ability as the repair agent is low. It is thought that the Woody Pitch has a smaller influence of the light irradiation than straight asphalt. Although acetic acid and the phenols in Woody Pitch were observed, which was one of the causes of the bad smell, it was concluded that that the Woody Pitch had almost none of the toxicity
