We have developed a unique neutralizer device that uses an yttrium target surrounded by a platinum wall to magneto-optically trap radioactive atoms. In general, the radioactive nucleus produced in a ...nuclear reaction is extracted and transported in ion form. For the magneto-optical trap, thermal neutralization must occur on the surface of a metal with a small work function. The converter can produce a neutral atomic beam with small angular divergence that, given the recycling of atoms and ions, converts ions into neutral atoms with remarkable efficiency. We demonstrated the ion neutralization process using stable rubidium and confirmed \(10^6\) neutralized atoms in the magneto-optical trap. Additionally, the experiment using francium demonstrated the obtaining of neutralized francium atoms.
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of \(10^{-27}\,e\cdot\mathrm{cm}\), which is an ...order-of-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry. To achieve this precision, we are developing a new high-intensity ultracold neutron (UCN) source using super-thermal UCN production in superfluid helium (He-II) and a nEDM spectrometer. The current development status of them is reported in this article.
Intraoperative neuromonitoring is widely used to prevent accidental injury during thyroid surgery. Anesthesia should be performed without muscle relaxant or agents with high muscle-relaxant potency. ...Remimazolam, a novel intravenous anesthetic, became available for clinical use in 2020. Remimazolam is an ultra-short-acting benzodiazepine with a very high clearance rate. However, there are very few data regarding its effect on currently used intraoperative neurological monitoring. Five patients underwent thyroid surgery using intraoperative recurrent laryngeal neuromonitoring. In all cases, intubation was performed after the administration of rocuronium. Anesthesia was maintained by continuous administration of remimazolam at the recommended dose and remifentanil, and no additional rocuronium or sugammadex was administered. Recurrent laryngeal nerve activity could be detected at the first stimulus after surgery was started, and monitoring continued thereafter. Intraoperative monitoring was performed without problems and all surgeries were completed without any complications. Anesthesia with remimazolam at the normal dose did not prolong the time to first positive electromyogram in patients undergoing thyroid surgery, and enables intraoperative recurrent laryngeal nerve monitoring to be performed without any serious perioperative adverse events. Remimazolam may provide a comparable quality of anesthesia to that of existing drugs for neuromonitoring during thyroid surgery.
Developing various morphologies and a stable nanostructure of self-assembled peptides on a two-dimensional substrate has played a key role for bioelectronics and biomedical applications. Here, the ...adsorption and self-assembled characters of two artificial peptides with opposite charges are investigated on graphite and MoS 2 surfaces. The ex situ atomic force microscopy (AFM) results show that their morphologies, ordering and stabilities on graphite and MoS 2 surfaces are different. The negatively charged peptides self-assembled into an ordered nanostructure on graphite surfaces with six-fold symmetry in a wide range of peptide concentrations. On MoS 2 surfaces, the peptide shows a morphology change from randomly orientated nanowires to ordered aligned nanowires as the peptide concentration decreases. On the other hand, the positively charged peptides formed a disordered structure such as wavy structures or aggregates on both substrates. The affinity constants of both peptides on graphite and MoS 2 were estimated using concentration-dependence experiments. The stability against water soaking was also examined for both peptides on graphite and MoS 2 . We found that negatively charged peptides have high affinity constants and stability on both substrates. The results suggest that the stability of self-assembled peptides could be determined by their affinity constants on the substrates. Finally, by using the negatively charged peptides as a stable molecular template, we have demonstrated a sequential self-assembly of two different peptides on a graphite surface. The peptides self-assembled first on the surface show an ability to maintain their nanostructures, and guide the self-assembly of secondary self-assembled peptides. Both of the self-assembled peptides show the same orientations and ordered structures on a graphite surface. These results will open a new door for the development of biosensors with multiple biological probes on a functional surface such as graphite or MoS 2 .
It is difficult to say that the low temperature heat (50-100 °C, e.g. factory exhaust heat or hot spring) is used effectively at present. Problems in use are unstableness of supply and low ...temperature, it is desirable to gather up by heat-storage and use it. The purpose of this study is the viscosity evaluation of nanosuspensiton type latent heat storage material. Tetracosane (CH3(CH2)22CH3 = 338.66, purity > 99%, melting point 50.6°C: Ref.) is used for dispersion material as a latent heat storage material of nanosuspension. The nanosuspension consists of tetracosane as the dispersed latent heat storage material, the distilled water and the non-ion surfactant. The latent heat storage material is dispersed averaged diameter about 250 nanometers in continuous water phase by an ultrasonic homogenizer. This paper deals with the viscosity including non-Newtonian characteristics that estimated by using a rotary viscosity meter (ThermoScientific, HAAKE Viscotester550). The measuring ranges are shear rate < 500 1/s and temperature 10-84 °C. Experimental data is adjusted by an exponential law, and useful experimental correlation equations are obtained.
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