Sleep and health deprivation of single mothers in Japan

This paper focuses on sleep and health deprivation of single mothers in Japan. Our statistical analysis demonstrates that some of the health consequences of single mothers’ constrained choice. Compared to married mothers, single mothers are not able to reduce their working hours even when they are ill, or when they need to meet family obligations. Conversely, longer work hours correlate negatively with single mothers’ health, while no such effect is found for married mothers. Being a single mother in Japan means not having the luxury of making a choice to optimize her own well-being when circumstances call for adaptation

Low Temperature Properties of Antiferromagnets on the Kagome Lattice

Thermodynamic properties of antiferromagnets on the kagome lattice at low temperatures are studied for classical Heisenberg spin systems. In pure Heisenberg model, a coplanar structure is chosen by the entropy effect but it has been turned out to be disorder. Namely, it is not the √-structure in spite of the previous conjectures. The properties are also compared with those of quantum spin systems

Pyrrolysyl-tRNA synthetase variants reveal ancestral aminoacylation function

AbstractPyrrolysyl-tRNA synthetase (PylRS) is a class IIc aminoacyl-tRNA synthetase that is related to phenylalanyl-tRNA synthetase (PheRS). Genetic selection provided PylRS variants with a broad range of specificity for diverse non-canonical amino acids (ncAAs). One variant is a specific phenylalanine-incorporating enzyme. Structural models of the PylRSamino acid complex show that the small pocket size and π-interaction play an important role in specific recognition of Phe and the engineered PylRS active site resembles that of Escherichia coli PheRS

Active Initialization Experiment of Superconducting Qubit Using Quantum-circuit Refrigerator

The initialization of superconducting qubits is one of the essential techniques for the realization of quantum computation. In previous research, initialization above 99\% fidelity has been achieved at 280 ns. Here, we demonstrate the rapid initialization of a superconducting qubit with a quantum-circuit refrigerator (QCR). Photon-assisted tunneling of quasiparticles in the QCR can temporally increase the relaxation time of photons inside the resonator and helps release energy from the qubit to the environment. Experiments using this protocol have shown that 99\% of initialization time is reduced to 180 ns. This initialization time depends strongly on the relaxation rate of the resonator, and faster initialization is possible by reducing the resistance of the QCR, which limits the ON/OFF ratio, and by strengthening the coupling between the QCR and the resonator