Spectroscopic Studies of Limb Spicules. I. Radial and Turbulent Velocities

We made high-resolution spectroscopic observations of limb-spicules in H-alpha using the Vertical Spectrograph of Domeless Solar Telescope at Hida Observatory. While more than half of the observed spicules have Gaussian line-profiles, some spicules have distinctly asymmetric profiles which can be fitted with two Gaussian components. The faster of these components has radial velocities of 10 - 40 km/s and Doppler-widths of about 0.4 A which suggest that it is from a single spicule oriented nearly along the line-of-sight. Profiles of the slower components and the single-Gaussian type show very similar characteristics. Their radial velocities are less than 10 km/s and the Doppler-widths are 0.6 - 0.9 A. Non-thermal "macroturbulent" velocities of order 30 km/s are required to explain these width-values.Comment: 13 pages, 12 figures, to be published in Publications of the Astronomical Society of Japa

The 4th World Landslide Forum: Landslide Research and Risk Reduction for Advancing the Culture of Living with Natural Hazards

Abstract The World Landslide Forum is a triennial mainstream conference that gathers together the scientific and technological community, policymakers, industry actors, public officials, and other stakeholders, who deal with the understanding and management of landslide disaster risk. The establishment of the ISDR-ICL Sendai Partnerships 2015–2025 for Global Promotion of Understanding and Reducing Landslide Disaster Risk in Sendai during the 2015 World Conference on Disaster Risk Reduction (WCDRR) enabled the landslide science and technology community support the implementation of the Sendai Framework for Disaster Risk Reduction 2015–2030 in order to prevent new and reduce existing disaster risk. The 4th World Landslide Forum (WLF4) was held in Ljubljana, Slovenia, from 29 May to 2 June 2017 and discussed the progress of landslide research and risk reduction for advancing the culture of living with natural hazards. A high-level panel composed of United Nations officials, international stakeholders, and national organizations sought to identify the best mechanisms to be developed by the community of the International Consortium on Landslides (ICL). The objective was to advance the implementation of the ISDR-ICL Sendai Partnerships, to achieve a better commitment among partners, and to provide substantive services to developing countries. During the WLF4, the 2017 Ljubljana Declaration on Landslide Risk Reduction was adopted and the concept framework of the Kyoto 2020 Commitment was endorsed

Structural Modification on Copper(I)-pyridylpyrimidine Complexes for Modulation of Rotational Dynamics, Redox Properties, and Phototriggered Isomerization

The redox properties of copper pyridylpyrimidine complexes, which undergo linkage isomerism based on pyrimidine ring rotation, were compared under different coordination environments. A newly synthesized compound, [Cu­(Mepypm)­(L_Mes)]­BF₄ (<b>1</b>·BF₄, Mepypm = 4-methyl-2-(2′-pyridyl)­pyrimidine, L_Mes = 2,9-dimesityl-1,10-phenanthroline) was compared with previously reported complexes of [Cu­(MepmMepy)­(L_Mes)]­BF₄ (<b>2</b>·BF₄, MepmMepy = 4-methyl-2-(6′-methyl-2′-pyridyl)­pyrimidine), Cu­(Mepypm)­(DPEphos)]­BF₄ (<b>3</b>·BF₄, DPEphos = bis­[2-(diphenylphosphino)­phenyl]­ether), [Cu­(Mepypm)­(L_Anth)]­BF₄ (<b>4</b>·BF₄, L_Anth = 2,9-bis­(9-anthryl)-1,10-phenanthroline), and [Cu­(Mepypm)­(L_Macro)]­BF₄ (<b>5</b>·BF₄). Isomer ratios, isomerization dynamics, redox properties, and photoelectron conversion functions varied with the coordination structure. Methyl substituents on the 6-position of the pyridine moiety increased steric repulsion and contributed to quicker rotation, enhanced photoluminescence, and increased photodriven rotational isomerization

Structural Modification on Copper(I)-pyridylpyrimidine Complexes for Modulation of Rotational Dynamics, Redox Properties, and Phototriggered Isomerization

The redox properties of copper pyridylpyrimidine complexes, which undergo linkage isomerism based on pyrimidine ring rotation, were compared under different coordination environments. A newly synthesized compound, [Cu­(Mepypm)­(L_Mes)]­BF₄ (<b>1</b>·BF₄, Mepypm = 4-methyl-2-(2′-pyridyl)­pyrimidine, L_Mes = 2,9-dimesityl-1,10-phenanthroline) was compared with previously reported complexes of [Cu­(MepmMepy)­(L_Mes)]­BF₄ (<b>2</b>·BF₄, MepmMepy = 4-methyl-2-(6′-methyl-2′-pyridyl)­pyrimidine), Cu­(Mepypm)­(DPEphos)]­BF₄ (<b>3</b>·BF₄, DPEphos = bis­[2-(diphenylphosphino)­phenyl]­ether), [Cu­(Mepypm)­(L_Anth)]­BF₄ (<b>4</b>·BF₄, L_Anth = 2,9-bis­(9-anthryl)-1,10-phenanthroline), and [Cu­(Mepypm)­(L_Macro)]­BF₄ (<b>5</b>·BF₄). Isomer ratios, isomerization dynamics, redox properties, and photoelectron conversion functions varied with the coordination structure. Methyl substituents on the 6-position of the pyridine moiety increased steric repulsion and contributed to quicker rotation, enhanced photoluminescence, and increased photodriven rotational isomerization