El Poder Político y Económico de Artefactos Líticos de Obsidiana del valle de Copán y la región de La Entrada, Honduras

This study sheds some light on the discussion about the nature of ancient Mesoamerican urbanism. The results of this research suggests that the management of the procurement and exchange of pre-worked obsidian polyhedral cores from Ixtepeque, accompanied by other factors, played a significant role in the development and maintenance of the Classic state of Copan. The royal court institutionalized the intra- and inter- procurement and distribution systems for at least one utilitarian commodity as part of the political or public economy. The long-distance exchange of small amounts of elite commodities such as finished artifacts made of green obsidian was mostly of social and symbolic importance rather than economic during the Early Classic period. The emergent elites of the Copan valley participated in long-distance exchange networks with the objective of legitimizing their authority and political power. However, local level exchange was more critical for the development of the state than the long- distance one.El presente estudio proporciona un poco de luz sobre la discusión acerca de la naturaleza del antiguo urbanismo Mesoamericano. Los resultados del estudio sugieren que la administración de la obtención e intercambio de los núcleos pretrabajados de navajas de obsidiana de Ixtepeque, acompañada con otros factores, jugó un papel significativo en el desarrollo y mantenimiento del estado Clásico de Copán. La corte real institucionalizó los sistemas de la obtención y distribución intra e interregional de por lo menos una mercancía utilitaria como parte de la economía política o pública. El intercambio a larga distancia de pequeñas cantidades de mercancías de la élite tales como artefactos terminados de obsidiana verde, fue principalmente de importancia social y simbólica más que económica durante el período Clásico Temprano. Las élites emergentes en el valle de Copán participaron en redes de intercambio a larga distancia con el objeto de legitimar su autoridad y poder político. Sin embargo, el intercambio a nivel local fue mucho más crítico para el desarrollo del estado que el intercambio a larga distancia

JARE Syowa Station 11-m Antenna, Antarctica

In 2012, the 52nd and the 53rd Japanese Antarctic Research Expeditions (hereinafter, referred to as JARE-52 and JARE-53, respectively) participated in five OHIG sessions - OHIG76, 78, 79, 80, and 81. These data were recorded on hard disks through the K5 terminal. Only the hard disks for the OHIG76 session have been brought back from Syowa Station to Japan, in April 2012, by the icebreaker, Shirase, while those of the other four sessions are scheduled to arrive in April 2013. The data obtained from the OHIG73, 74, 75, and 76 sessions by JARE-52 and JARE-53 have been transferred to the Bonn Correlator via the servers of National Institute of Information and Communications Technology (NICT). At Syowa Station, JARE-53 and JARE-54 will participate in six OHIG sessions in 2013

Validation of the effect of mantle inelasticity and latitude dependence through the observed tidal parameters

第2回極域科学シンポジウム/第31回極域地学シンポジウム 11月16日（水） 国立国語研究

Performance of a newly developed SDCCD for X-ray use

A Scintillator Deposited CCD (SDCCD) is a wide-band X-ray detector consisting of a CCD and a scintillator directly attached to each other. We assembled the newly developed SDCCD that the scintillator CsI(Tl) is below the fully depleted CCD. The incident X-rays enter the CCD depletion layer first. Then, X-rays passing through the depletion layer are absorbed in the CsI(Tl). The contact surface of the CCD is a back-illuminated side so that we can have good light collection efficiency. In our experimental setup, we confirmed good performance of our SDCCD detecting many emission lines up to 88\,keV that comes from $^{109}$Cd.Comment: 4 pages, 6 figures, accepted publication for Nucl. Instr. and Meth. (2010

On the observed annual gravity variation and the effect of sea surface height variations

Based on two datasets of sea surface height (SSH) variations, the Parallel Ocean Climate Model (POCM) [J. Geophys. Res. 101 (C10) (1996) 25779] and the TOPEX/POSEIDON (T/P) altimeter, we have analyzed the effect of SSH variations on gravity observations

Frequency dependent Love and Shida numbers determined from GPS and gravimetric data at Syowa Station, Antarctica

第3回極域科学シンポジウム/第32回極域地学シンポジウム 11月29日（木） 国立極地研究所 ３階ラウン

Late Holocene volcanic activity and environmental change in Highland Guatemala

We present a record of late Holocene volcanic eruptions with elemental data for a sequence of sampled tephras from Lake Amatitlan in Highland Guatemala. Our tephrochronology is anchored by a Bayesian P_Sequence age-depth model based on multiple AMS radiocarbon dates. We compare our record against a previously published study from the same area to understand the record of volcanism and environmental changes. This work has implications for understanding the effects of climate and other environmental changes that may be related to the emission of volcanic aerosols at local, regional and global scales

Five years’ gravity observation with the superconducting gravimeter OSG#058 at Syowa Station, East Antarctica: gravitational effects of accumulated snow mass

Continuous gravimetric observations have been made with three successive generations of superconducting gravimeter over 20 yr at Syowa Station (E, [Math Processing Error]S), East Antarctica. The third-generation instrument, OSG#058, was installed in January 2010 and was calibrated by an absolute gravimeter during January and February, 2010. The estimated scale factor was −73.823 ± 0.053 μGal V−1 (1 μGal = 10−8 m s−2). The first 5 yr of OSG#058 data from 2010 January 7 to 2015 January 10 were decomposed into tidal waves (M3 to Ssa) and other non-tidal components by applying the Bayesian tidal analysis program BAYTAP. Long-term non-tidal gravity residuals, which were obtained by subtracting annual and 18.6 year tidal waves and the predicted gravity response to the Earth\u27s variable rotation, showed significant correlation with the accumulated snow depth measured at Syowa Station. The greatest correlation occurred when the gravity variations lagged the accumulated snow depth by 21 d. To estimate the gravitational effect of the accumulated snow mass, we inferred a conversion factor of 3.13 ± 0.08 μGal m−1 from this relation. The accumulated snow depth at Syowa Station was found to represent an extensive terrestrial water storage (the snow accumulation) around Syowa Station, which was estimated from the Gravity Recovery and Climate Experiment satellite gravity data. The snow accumulation around Syowa Station was detectable by the superconducting gravimeter

Tidal observation around Syowa Station, Antarctica

第2回極域科学シンポジウム/第31回極域地学シンポジウム 11月16日（水） 国立国語研究所　2階フロ