11 research outputs found
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<sub>Mes</sub>)]BF<sub>4</sub> (<b>1</b>·BF<sub>4</sub>, Mepypm = 4-methyl-2-(2′-pyridyl)pyrimidine, L<sub>Mes</sub> = 2,9-dimesityl-1,10-phenanthroline) was compared with
previously reported complexes of [Cu(MepmMepy)(L<sub>Mes</sub>)]BF<sub>4</sub> (<b>2</b>·BF<sub>4</sub>, MepmMepy = 4-methyl-2-(6′-methyl-2′-pyridyl)pyrimidine),
Cu(Mepypm)(DPEphos)]BF<sub>4</sub> (<b>3</b>·BF<sub>4</sub>, DPEphos = bis[2-(diphenylphosphino)phenyl]ether), [Cu(Mepypm)(L<sub>Anth</sub>)]BF<sub>4</sub> (<b>4</b>·BF<sub>4</sub>, L<sub>Anth</sub> = 2,9-bis(9-anthryl)-1,10-phenanthroline), and [Cu(Mepypm)(L<sub>Macro</sub>)]BF<sub>4</sub> (<b>5</b>·BF<sub>4</sub>).
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<sub>Mes</sub>)]BF<sub>4</sub> (<b>1</b>·BF<sub>4</sub>, Mepypm = 4-methyl-2-(2′-pyridyl)pyrimidine, L<sub>Mes</sub> = 2,9-dimesityl-1,10-phenanthroline) was compared with
previously reported complexes of [Cu(MepmMepy)(L<sub>Mes</sub>)]BF<sub>4</sub> (<b>2</b>·BF<sub>4</sub>, MepmMepy = 4-methyl-2-(6′-methyl-2′-pyridyl)pyrimidine),
Cu(Mepypm)(DPEphos)]BF<sub>4</sub> (<b>3</b>·BF<sub>4</sub>, DPEphos = bis[2-(diphenylphosphino)phenyl]ether), [Cu(Mepypm)(L<sub>Anth</sub>)]BF<sub>4</sub> (<b>4</b>·BF<sub>4</sub>, L<sub>Anth</sub> = 2,9-bis(9-anthryl)-1,10-phenanthroline), and [Cu(Mepypm)(L<sub>Macro</sub>)]BF<sub>4</sub> (<b>5</b>·BF<sub>4</sub>).
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