In this study, we investigated the use of cyclodextrins (CDs) as scaffolds for constructing anion receptors. We synthesized modified α- and β-CDs (1-3), in which the hydroxyls on C-2 and C-3 are protected by benzyl, acetyl, or propionyl groups; moreover, we investigated their anion binding properties in CD3CN or CD3CN/D2O (99/1, v/v) using 1H-NMR titration experiments. The results demonstrate that CD-based receptors (1-3) effectively bind with AcO- and H2PO4- by cooperative intermolecular hydrogen bondings with alcoholic hydroxyl groups on C-6. The selectivity trends thought to be a function of the basicity of the anions and the size of the binding pocket in the receptors.
Visualization of 1 MHz ultrasonic burst pulse propagation around a crack in a glass sample is carried out by the strobo-photoelastic method to explore the propagation properties in the ultrasonic wave field under existing residual stress. Imaging results of ultrasonic wave are captured by the C-MOS camera and they were processed with integration, subtraction and normalization to enhance the contrast of the images. In the glass sample, the crack was introduced to make a distribution of static residual stresses. Residual stress was preliminary imaged by the commercial tint color strain detector to identify and to locate the distribution of stress. In the experiments for the ultrasonic wave propagation around the crack tip, wavefront was clearly visualized and its brightness was affected by the birefringence of residual stress. As the results, dynamic compressive stress by the ultrasonic wave was successfully visualized and illuminous in the static residual stress field.
In the development of a bonded abrasive diamond tool, it was studied that the wettability of Cu-Ag solder on carbon steel plate, gel density, maximum temperature, and holding time. The test results were evaluated by “JIS Z 3191 Method of wetting test for brazing filler metals”. From the experimental results, the best conditions for producing the new diamond tool are as follows: Cu-Ag solder, 80-20(mass%); gel density, 0.2(mass%); maximum temperature, 1163 K; and holding time at maximum temperature, 300 s. A diamond jigsaw was constructed by using these processes and demonstrated that the new diamond tool could cut a brick. In addition, the degree of vacuum is important during fabrication; therefore, vacuum equipment with sufficient capacity is required for producing these tools.
The IC card is widely used in various public systems such as in credit cards, electronic wallet systems, and card locking systems. Therefore, an integrated card (multifunction card) adapted to various utilization scenarios has been developed. The numerically functionalized device requires a large data capacity and large-volume data communication. Enhancement of the numerical functionalization may lead to an increase in the data transmission time, inconveniencing users in the near future. In this paper, we propose a data transmission method using both analog and digital signals. This method utilizes a synthesis signal called a Hybrid-signal generated electrically from an analog and digital signal, using a signal addition circuit. We have developed a prototype system using the Hybrid-signal and performed data communication experiments. The experimental results of the prototype system suggest that the Hybrid-signal can simultaneously transmit both analog and digital information.