TbFe2 grain alignment in Tb-Fe alloys solidification under microgravity (μG) and terrestrial gravity (1G) was investigated. The microgravity was obtained by free fall in drop tower facility at the Japan Microgravity Center (JAMIC). TbFe1.83 alloy of 1 gram was prepared for unidirectional solidification under microgravity environment. The samples were melted just before drop and solidified by contact chill against a sample under the microgravity during dropping. The microstructure of μG sample was columnar and TbFe2 grains were strongly aligned along the thermal gradient. In 1G sample, the aligned microstructure was not obtained. The alloy composition was measured by EDX. The TbFe3 phase was observed in 1G sample, and no TbFe3 phase was observed in μG sample, caused by reduction of thermal convection in microgravity environment. In μG sample, the (111) orientation of TbFe2 grains was obtained. The magnetostriction in parallel direction to the thermal gradient was larger than those in perpendicular direction in μG and 1G sample. The magnetostriction of μG sample in parallel direction to the thermal gradient was larger than that for 1G sample caused by microstructure.
Effect of electron beam (EB) irradiation on bending fracture toughness of a silica-based glass was studied. The EB irradiation enhanced the bending fracture stress and strain, which were higher than those before EB irradiation. The EB-reinforcement was explained by the stress-relaxation of glassy structure.
A bioelectronic gas-sensor (bio-sniffer) for hydrogen peroxide (H2O2) vapor was constructed by immobilized catalase to the oxygen electrode for detecting oxygen as enzyme catalytic product. The biosensor with catalase was calibrated against H2O2 solution from 0.01-12.0mmol/l. Applying to H2O2 vapor analysis, bio-sniffer could be detected odorless H2O2 vapor, thus obtaining the calibration range from 1.0 to 10.8ppm.
A 4ch-scent reproducing system was constructed by combining two gas generators with totally individual 4-colume channels, thus generating smell vapor by mixing 4 kinds of chemical components in the gas-phase. The reproduced smells of fish, radish, layer and distilled spirit by the system were could be communicated to over 80% subjects by the sensory test, respectively.
It is known that “knowledge/affection/consciousness” called 3 functions are in the brain of the person. Two functions of “the affection/consciousness” are perceived among these in this research. Thereupon, what kind of signal appears in the electroencephalogram (EEG) is checked empirically, when the testee smelled the stench of the food that set the corruption. The result of the EEG is reproduced to the line signals of 3 dimension from the chronological order signal of 1 dimension by using the method of Ruell and Takenns. Thereupon, the line signals of 3 dimension is done in the phase space of 3 dimension the copy picture. As for the attractors of 3 dimension the cross section is requested by the method of Poincare'e. Also, the return map is painted from this cross section. It expresses the complexity of the return map with the fractal dimension last, and make this the material and the attempt of numerical value-ization of “the anxiety and wariness” of food poisoning is proposed.
Effect of ultrasonic treatments (28, 45, 100kHz) on Saccharomyces cerevisiae was investigated with fluorescence stained organelle images using a confocal laser-scanning microscope (CLSM) and with a formation ability of cell colonies. The ultrasonic treatment, especially lower frequency as 28kHz, was effective for sterilizing S. cerevisiae cell. The membrane collapses of cell and organelle caused by ultrasonic treatment were observed by CLSM images.
A narrow wearable oxygen sensor for transcutaneous monitoring has been developed using both metal-weldable and gas-permeable membranes. The wearable sensor could be placed directly to the forearm skin surface and to monitor the transcutaneous oxygen change induced by skin warming.
Effects of external stimuli (ultrasonic treatment and ozone exposure) on mixed culture of micro-organisms (Saccharomyces cerevisiae and Bacillus subtills) were evaluated in order to obtain the incubation condition for a selective culture of micro-organisms. As the results, 43kHz of ultrasonic treatment and ozone exposure were effective on the selective sterilization of S. cerevisiae and B. subtilis, respectively.
A telemetry system was constructed by a mobile measuring device and a base computer system with two mobile phones. As the results of applying it with wearable sensors onto skin-surfaces, the system was possible to tele-monitor the skin temperature and humidity successfully.
A biosensor for nitrogen-compounds was constructed by immobilizing monoamine oxidase type-A (MAO-A) as one of xenobiotic metabolizing enzymes. The MAO-A immobilized sensor responded to several kinds of nitrogen compounds (trimethylamine, triethylamine, ammonia) and methyl mercaptan with substrate selectivity of MAO-A, and calibrated against trimethylamine [TMA] solution from 0.1 to 5.0mmol/l.
A bioelectronic gas-sensor (bio-sniffer) for dimethyl sulfide (DMS) was fabricated by incorporating an enzyme electrode with flavin-containing monooxygenase into a reaction unit with both liquid- and gas-phase cells separated a diaphragm membrane. The bio-sniffer was calibrated against DMS vapor from 2.6 to 147ppm.
Dye-sensitized solar cells (DSC) were fabricated without a sintering process by using an electrophoretical deposition method. The energy conversion efficiency of this DSC was 2.5% snider irradiation of simulated solar light (100mw cm-2).
When the making of LB film with Merocyanine Dye, mixing of Arachidic acid stabilize the LB film. However, an electronic performance improves more by making only Merocyanine. Therefore, it is necessary to make the film stabilize onry in Merocyanine simple substance. For this purpose, the control technology of molecular condition was developed by electric field and ultrasonic vibration. Moreover, the state of controlled molecule was examined with the π-A curve.
A thick (Nb, Ta)3Sn layer can be synthesised in the Ta-Sn core/Nb (Nb-Ta) sheath composite. The diffusion of Nb from the sheath to the core seems to play a key roll to enhance that of Sn from the core to the sheath synthesizing (Nb, Ta)3Sn layer. In the present study, new Jelly Roll processed (Nb, Ta)3Sn wires are fabricated using Sn-Ta sheets richer in Sn and Nb sheets. The JR wires exhibit attractive high-field performance, and a small amount of Cu addition to the Sn-Ta sheet effectively decreases the reaction temperature.
Phase-separation process is essential phenomenon owing to influence on quality of alloy. Miscibility gap was found on phase diagram of Cr-W alloy, however other things of Cr-W alloy haven't been studied after that. Therefore the aim of this study is to prepare nonequilibrated alloy under the miscibility gap by shock compression method, and to study grain size dependence on it. W powder of average grain size between 1μm to 8μm mixed Cr powder of 10μm grain size is put pressure on 42GPa using a one-stage powder gun. As a result, the smaller W grain size is, the more Cr-W alloy. And in the case that W powder is small to 0.6μm and enough specific surface area in mixed powder, nearly homogeneous Cr-W alloy prepared. Fluid Cr alloy with W melted as high temperature concentrate on surface of grains.
We have developed a continuous cam phase variable mechanism wherein an electromagnetic clutis is utilized for controlling a helical mechanism “New Technology Variable Cam Phaser (NT-VCP)” for the first time in the world. NT-VCP is called “Electromagnetic Valve Timing Control (eVTC)”, carried Nissan's new “V” type six cylinders engine. NT-VCP has implemented an extensive control range and a fast response. As a result that engine was able to get excelled acceleration performance.
A H2O2 sensing-pump was constructed with a manometer and a catalase immobilized membrane. A vaporization of oxygen at the enzyme membrane was induced by the catalytic reaction with H2O2 solution, thus resulting in a pumping pressure in the manometer. The characteristics of the pumping actuator (i.e. response curve, pumping pressure) were dependent on the concentration of H2O2.
Japan in the second half of the 20th century brought about expansion of scientific civilization with technical development. Industry progressed and the advanced information society. However, as a result, pollution was also brought about. Now, in addition to material pollution, it is thought that mental pollution also exists simultaneously with it. Combining various data with the mental disease, we stressed the existence of “mental pollution.”