Toyama Science Museum

Toyama-shi, Japan

Toyama Science Museum

Toyama-shi, Japan
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Sugai H.,Kyoto University | Hattori T.,Japan National Astronomical Observatory | Kawai A.,Kyoto University | Ozaki S.,Japan National Astronomical Observatory | And 9 more authors.
Publications of the Astronomical Society of the Pacific | Year: 2010

In order to investigate physical conditions of ionized gas in galaxies, as well as its kinematics, we have developed the Kyoto tridimensional spectrograph II. It is a multimode optical instrument, including integral field spectrograph (IFS) and Fabry-Perot imager modes. We have designed it compact so that we can mount it on 2 m class telescopes as well as on the 8.2 m Subaru telescope. Special care was taken to obtain high-quality calibrations in the IFS mode. In order to remove the chromatic aberration of micropupil images produced by a lenslet array, we have introduced a corrector lens system behind the lenslet array. The internal calibration system simulates the telescope optics so that the system provides micropupil images identical to those produced by the telescope. The rigidness of the instrument provides the positional stability of micropupil images. We have succeeded in test observations of all the modes on Subaru and the University of Hawaii 88 in (UH88) telescopes and have verified the performance of the instrument. This includes the instrument efficiencies as well as the effective sky background subtraction and the minimization of crosstalk effects in the IFS mode. In the IFS mode a spatial resolution of 0.4 was obtained in good seeing conditions. Each of 37×37 lenslets subtends 0.1 in Subaru's case. This samples the image size well. A wider field of view is emphasized in the case of UH88. © 2009. The Astronomical Society of the Pacific. AU rights reserved.

Xing L.,China University of Geosciences | Xing L.,University of Alberta | Li D.,Geological Museum of Gansu | Harris J.D.,Dixie State University | And 5 more authors.
Acta Palaeontologica Polonica | Year: 2013

Herein we describe deinonychosaurian (Dinosauria: Theropoda) tracks in the Lower Cretaceous Hekou Group at sites I and II of Liujiaxia Dinosaur National Geopark, Gansu Province, China. The site preserves 71 didactyl tracks, the largest concentration of deinonychosaurian tracks in Asia. The tracks pertain to a new dromaeopodid ichnospecies: Dromaeosauripus yongjingensis ichnosp. nov., which is diagnosed by: a digital pad formula of x-1-3-4-x and a mean divarication angle between digits III and IV of 19°, and having the proximal portion of digit II contacting the anterior margin of a large, rounded metatarsophalangeal pad. Six Dromaeosauripus trackways from site II comprise at least two, and possibly three, turning trackways in which the track maker(s) turned without slowing down. None of the Dromaeosauripus trackways are parallel or closely spaced, suggesting that they were made by solitary track makers. Estimates of dromaeopodid track-maker sizes are between 61-300 cm, well within the size range established by body fossils of both dromaeosaurids and troodontids. Copyright © 2013 L. Xing et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Fujita M.,Toyama Science Museum | Lee Y.-N.,Korea Institute of Geoscience and Mineral Resources | Azuma Y.,Fukui Prefectural Dinosaur Museum
Palaios | Year: 2012

Two unusual, well-preserved, tridactyl trackways associated with sinuous grooves from the Lower Cretaceous Yanguoxia tracksite (Yongjing County, Gansu Province, China) are described and the behavior they present is discussed. The sinuous grooves are protracted and simple, with high percent interruption metric values and a low sinuosity. They are located between left and right pes tracks that have three separated, rounded distal digit impressions but lack plantar impressions. The presence of fine details such as delicate, double-sided, branching mud wrinkles in the grooves, coupled with backward drag marks at the rear of the tracks, indicate that the tracks and grooves are true tracks. We interpret the sinuous grooves as tail traces, and suggest that the tracks were made by a tridactyl dinosaur, probably by an ornithopod. It is hypothesized that the trackmakers made these trackways while partially submerged, propelled by toe-only steps, and leaving a subaqueously emplaced trail. © 2012 SEPM (Society for Sedimentary Geology).

Nishioka Y.,Osaka University | Nakagawa R.,Mie Prefectural Museum | Nunami S.,Asakura Publishing Co. | Hirasawa S.,Toyama Science Museum
Zoological Studies | Year: 2016

Small mammalian remains were newly discovered from the Late Quaternary sediments of the Yaeyama region (Ishigaki and Yonaguni Islands) in the southwestern-most part of Japan. We examined these materials based on taxonomical and chronological approaches, in order to reconstruct the past fauna in this region. Accelerator Mass Spectrometry radiocarbon dating indicates that the mammalian assemblages from Ishigaki and Yonaguni Islands are composed mainly of late Holocene fossils. The fossil assemblage from Ishigaki Island comprises five species of small mammals belonging to Soricomorpha (Suncus murinus), Chiroptera (Pteropus sp., Hipposideros turpis, and Rhinolophus perditus), and Rodentia (Niviventer sp.). One rodent bone, collected from the fissure sediments near Sabichi-do Cave, Ishigaki Island, is dated at 230 ± 20 yBP (ca. AD 1,700), and is considered part of the recent remain. Furthermore, the fossil assemblage from Umabana-zaki Fissure, on Yonaguni Island, is dated at 1,760 ± 20 yBP (ca. AD 300) and comprises three species of small mammals belonging to Chiroptera (Pipistrellus cf. abramus) and Rodentia (Niviventer sp. and Mus musculus). Niviventer is not currently distributed in Japan. Only domestic rats (Rattus rattus and R. norvegicus) live on Ishigaki and Yonaguni Islands at the present time. However, the fossil assemblage from Umabana-zaki Fissure is dominated completely by Niviventer sp. Most fossils of small mammals found from the late Holocene Ishigaki and Yonaguni Islands represented species that are currently endemic to the Yaeyama region. Niviventer sp. from these islands is unique because this form has never been found from neighboring regions, such as Taiwan and Miyako Islands, and because it likely existed in the late Holocene. These discoveries support the hypothesis that the Yaeyama region had been isolated zoogeographically from the continent even during the Last Glacial Maximum, when the sea level had drastically fallen. © 2016, Academia Sinica. All rights reserved.

Watanabe K.,Toyama Prefectural University | Honoki H.,Toyama Science Museum | Endo F.,Toyama Prefectural University | Murakami T.,Toyama Prefectural University | And 4 more authors.
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2011

Measurements of ultrafine particles (UFPs) with diameters smaller than 100 nm were made with a Scanning Mobility Particle Sizer on the roadside of the Tateyama-Kurobe Alpine route on the western slope of Mt. Tateyama, Japan, in the summer and autumn of 2007 and 2008. The number concentrations of nanoparticles (NPs) with diameters smaller than 50 nm increased sharply in the morning. This increase agreed with that of the NO concentration, which is a good indicator of vehicle emissions. Although the peak concentration of NO was also detected in the late afternoon, the concentrations of NPs did not increase. The vehicle emission of UFPs may vary considerably with the driving conditions. The emission of NPs might have been accelerated under a high engine-load condition. The NP concentrations in October were much higher than those in August, although there were more buses in August than in October. The number size distribution in the morning was bimodal, with the first peak around 20-30 nm and the second one around 70-80 nm. The first peak became small during the daytime. The first peak disappeared, and a small second peak remained through midnight. Copyright © Taylor & Francis Group, LLC.

Kashiwagi K.,University of Toyama | Hirasawa S.,Toyama Science Museum
Memoir of the Fukui Prefectural Dinosaur Museum | Year: 2015

This is the first report on radiolarians present in the Kaizara Formation of the Kuzuryu Subgroup, Tetori Group, located in the Shimoyama-Kaizara area, in central Japan. Previous works based on ammonoid biostratigraphy date the Kaizara Formation in the late Bathonian to early Callovian. The radiolarian fossils were extracted from two calcareous nodules included in silty sandstone that was collected as a float boulder on a river bed draining into the Taniyama River, a tributary of the Kuzuryu River. Although its precise stratigraphic horizon is unknown, the location of collection and characteristic features, namely the presence of calcareous nodules, make it a probable derivate of the Kaizara Formation. Several other microfossils and bioclasts were also retrieved from the same radiolarian-bearing nodules: benthic foraminifers, sponge spicules, prodissoconchs of pelecypods, and echinoderm fragments. According to the Unitary Associations Zones (UAZ.) of Baumgartner et al. (1995), the presence of Dictyomitrella ? kamoensis, Striatojaponocapsa conexa, Stichocapsa naradaniensis and Williriedellum carpathicum places the radiolarian age between the late Bathonian and early Callovian (Middle Jurassic) of UAZ. 7. In addition, the radiolarian zonation for Japan and the western Pacific proposed by Matsuoka (1995a) suggests the age to fall in the interval ranging from the Callovian to Oxfordian (Middle-Late Jurassic) based on the co-occurrence of Stichocapsa naradaniensis and Striatojaponocapsa conexa. According to the UAZ. of Baumgartner et al. (1995), the radiolarian age of the Kaizara Formation is shown to range from the late Bathonian to early Callovian, based on the consistency between the radiolarian age and the ammonoid age. © by the Fukui Prefectural Dinosaur Museum.

Watanabe K.,Toyama Prefectural University | Honoki H.,Toyama Science Museum | Iwai A.,Toyama Prefectural University | Tomatsu A.,Toyama Prefectural University | And 6 more authors.
Water, Air, and Soil Pollution | Year: 2010

Measurements of the chemical composition of fog water at Murododaira (altitude, 2,450 m), on the western slope of Mt. Tateyama near the coast of the Japan Sea, were performed each autumn from 2004 through 2007. Strong acidic fogs (pH∈<∈4) containing high concentrations of nssSO 4 2- were frequently observed in the autumn of 2005, when the air mass at Mt. Tateyama originated mainly from the polluted regions of Asia. The ratio of NO 3 - /nssSO 4 2- in fog water was relatively high in 2004 and 2007. High concentrations of nssCa2+ derived from dust particles were detected in 2006. Background Kosa particles might have been predominant in the free troposphere and could have neutralized acidic fogs in the autumn of 2006. High concentrations of sea-salt components were also observed in October 2005. The sea-salt particles might have been transported from the Pacific Ocean by a strong typhoon, and significant Mg 2+ loss was observed. Peroxides higher than 100 μM, which are seriously harmful to vegetation were sometimes detected. © 2009 Springer Science+Business Media B.V.

Uehara Y.,Kyushu University | Kume A.,Kyushu University | Chiwa M.,Kyushu University | Honoki H.,Toyama Science Museum | And 2 more authors.
Arctic, Antarctic, and Alpine Research | Year: 2015

To estimate the impact of atmospheric deposition on alpine ecosystems, we evaluated the interactions between atmospheric deposition and the Pinus pumila canopy close to the summit of Mount Tateyama, central Japan. We analyzed the chemical characteristics of rain, fog, and throughfall under the canopy in the summertime for 5 years. The concentrations of inorganic nitrogen and sulfate in precipitation at the summit (2839 m a.s.l.) were lower than at the base (13 m a.s.l.), but the total amounts deposited tended to be larger, because the precipitation was greater at the summit and highly concentrated fog water was deposited on the pine canopy. Large fluctuations in the quality and quantity of deposition were due to interannual variations in the meteorological conditions. About 80% of NO3 - -N and NH4 +-N (0.40 and 0.47 kg ha-1 month-1) from rain and fog were retained in the P. pumila canopy, and contributions from fog were twice those from rain. Considerable amounts of K+, Mg2+, and Ca2+ ions (0.97, 0.13, and 0.13 kg ha-1 month-1) were leached out from the canopy to the soil as throughfall. The leaching did not increase with rainfall, but increased as the duration of the fog and dew increase. © 2015 Regents of the University of Colorado.

Watanabe K.,Toyama Prefectural University | Honoki H.,Toyama Science Museum | Iwama S.,Toyama Prefectural University | Iwatake K.,Toyama Prefectural University | And 6 more authors.
Erdkunde | Year: 2011

Measurements of the chemical composition of fog water at Murododaira (altitude, 2,450m), near the summit of Mt. Tateyama near the coast of the Japan Sea, were performed during the summers (late July and August) of 2004 and 2008 and the autumns (September and early October) of 2008 and 2009. Fog water was also sampled at Bijodaira (altitude, 977m) and Midagahara (altitude, 1,930m), on the western slope of Mt. Tateyama, in the autumn of 2009. Strong acidic fogs (pH <4) were observed during the summer and autumn. The mean ionic concentration at Murododaira in the summer of 2008 was higher than that in the autumn. The air mass at Murododaira was derived primarily from the polluted regions of Asia in the summer of 2008, and the trans-boundary air pollution might have contributed to fog water acidification. On the other hand, acidic fogs might have been produced mainly by pollutants from central and western Japan in 2004. The nonsea-salt sulfate (nssSO 4 2-) concentration was usually higher than the NO 3 - concentration at Murododaira, and the chemical characteristics are different from that of fog water near the industrial regions of Japan where NO x is the main air pollution. The average ratio of NO 3 -/nssSO 4 2- in fog water was relatively high in the summer of 2004. The mean NO 3 -/nssSO 4 2- ratio was significantly low during the autumn of 2008 when the air mass usually came from Asia. Relatively high concentrations of sea-salt components were detected at Murododaira during the autumn of 2009. The acidity of fog water was higher at Murododaira than at Bijodaira and Midagahara. The deposition flux of acidic species by fog water seemed to be higher at Murododaira than at the lower sites.

Measurements of size-separated aerosol number concentrations at Midagahara (altitude, 1,930 m), on the western slope of Mt. Tateyama near the coast of the Japan Sea, were performed each autumn from 2006 to 2011. High number concentrations of particles larger than 2 μm were frequently seen in 2006 and 2009 when the influence of Asian dust might have been significant. The pH and the ratio of Ca2+ to total ions were high in the rainwater bulk sampled when high number concentrations of coarse particles were observed. The mean pH of rainwater during the autumn in 2006 was significantly higher than that in 2007 and 2008. Acidic species might have been neutralized by the Asian dust particles. Dust particles may highly affect the natural environment, such as forest ecosystems, at high elevations during seasons without snow cover. © 2013 Springer Science+Business Media Dordrecht.

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