The development of a 3-dimensional (3-D) navigation system of ferromagnetic particles in a flow system was performed. In order to improve the practice of using externally-applied magnetic fields for targeting the magnetic particles to a circumscribed body region, we tested the feasibility of a novel 3-D navigation system, made by applying a strong external (magnetic) field through a GdBaCuO bulk superconductor. A 3-D theoretical model is proposed and used in order to evaluate the efficiency of the navigation/retention of magnetic particles in the flow system. Furthermore, an experimental model system was made and the efficiency of a prototype system was examined. Comparisons of experimental and the corresponding calculation results were made to examine the theoretical model system
The objective of this study is to presume the human psychological condition with the biological signal, and to control the living environment automatically based on the result. In this paper, the influence of living environment on the human body was examined as a fundamental study. It is considered that the indoor living environment typified by light environment has a strong influence on the human body, because modern people live indoors almost all day. The influence of environment light on physiological response was evaluated. Biological reactions stimulated by red, green and blue light were analyzed using an ECG (electrocardiogram), EEG (electroencephalogram) and MEG (magnetoencephalogram). As a result, a significant difference was observed between green and red light in LF/HF obtained from ECG, percentage of alpha wave rate obtained from EEG and amplitude of P300 obtained from MEG. In addition, the possibility was suggested that green light induces a rest state whereas red light induces a concentrated state. Based on the results, the effect of light on the physiological response was discussed toward the construction of automated control system of living environment triggered by biological signal.
In this paper, we examined a new method for decontamination of soils by magnetic separation to reduce the volume of contaminated soils. In this method, we separate paramagnetic 2:1 type clay minerals with strong adsorbility of Cs ions from diamagnetic 1:1 type clay minerals with weak adsorbility of Cs ions. In addition, Cs ions desorbed from 1:1 types by washing are migrated to 2:1 type clay minerals. As a result, the doses of 1:1 type clay minerals can be reduced. First, it became apparent by the particle trajectory simulation that vermiculite, which is 2:1 type clay mineral, could be selectively separated by high gradient magnetic separation using superconducting magnet. Second, we confirmed the separation of vermiculite coexisting with kaolinite, which is 1:1 type clay mineral, by the experiments based on the simulation. Moreover, the experiments using the actual contaminated soils were conducted to examine the migration of Cs ions from 1:1 to 2:1 type clay minerals. As a result, it was observed that Cs ions desorbed from 1:1 types could be adsorbed to 2:1 type clay minerals when using 0.1 mol/L KI as wash solution. It showed the possibility of decreasing the dose of 1:1 type clay minerals.
In the previous study, we proposed a method to evaluate the tactile sensation of human hair during hair washing. By using this method, a sensory score of "squeaky" sensation during hair washing with shampoo was reproduced by the physical indexes obtained by the integration of the reactive force and the frequency analysis of temporal fluctuation. By clarifying the microscopic mechanism of decrease in "squeaky" sensation by using shampoo products, it becomes possible to formulate better hair-care products. In this study, the microscopic interaction between human hair and shampoo components was investigated by using sound analysis and hair surface analysis. It was shown that the "squeaky" sensation can be evaluated by the sound parameters. Furthermore, based on the microscopic observation and identification, the model of microscopic interaction by hydrophilic interaction between hair surface and coacervate was suggested.
Cerium oxide used for glass polishing agent is processed as wastewater mixed with the polishing sludge of the glass. The recycling of cerium oxide may have a large influence on reduction of environmental burden and resources recycling. In the treatment process of wastewater, the complex of cerium oxide and iron flocculant is formed by co-precipitation to clear the fluid. In order to recycle the cerium oxide, it is necessary to eliminate the cohesion and then remove the iron content. In this study, the aggregated particles were dispersed by pH adjustment, and the iron content was separated by the developed high gradient magnetic separation system (HGMS) with superconducting magnet. The optimum condition was examined by calculation and experiment. In addition, we succeeded to remove the silica particle by magneto-Archimedes levitation. It was confirmed that ferrous particles and silica particles can be removed from wastewater by using superconducting bulk magnet, which makes it possible to reuse ceria particle as the polishing agent.
Fundamental study of a high speed filtration system using HTS magnet for purifying the used wash water of drum has been made. This system consists of a magnetic seeding device and a magnetic filtration device. Since the wastewater is a mixture of various used wash water, the wastewater treatment is difficult to realize practically. For that reason, the wastewater is processed as industrial waste products. In the purification system the waste component in the wastewater is made into the floc containing magnetite in the magnetic seeding device. The wastewater is made to flow close to HTS bulk magnet and the floc is filtered by magnetic force. It was found that the system shows the extensibility and is low cost because of the simple construction.
In ITER (International Thermonuclear Experimental Reactor), the insulation materials containing polymeric matrix are the most radiation-sensitive among the materials constituting the superconducting magnet in the nuclear fusion reactor. Insulation materials are fabricated by impregnating the polymeric material into the stacks of alternating layers of polyimide films and glass cloth. There are a lot of studies about irradiation property of each constituent material, whereas few studies are reported about the irradiation effect on the resin -glass cloth and the resin –polyimide film boundary. In this study, we focused on the degradation of the resin-glass cloth boundary. The influence of the surface treatment and the weaving density of the glass cloth on the boundary degradation was evaluated by the mechanical properties before and after irradiation. The composite material specimens were prepared using the glass cloth with different surface treatment, and with different weaving density. The inter laminar shear strength (ILSS) test was conducted to examine the influence of the boundary on the radiation effect. In addition, the fracture mechanism were evaluated by optical micro-scope. Based on the results, it was indicated that the weaving density of the glass cloth is small influence on the irradiation effect and the radiation resistance was improved by the surface treatment.
