检索结果-南通市图书馆

Infrasound observations at Syowa Station,East Antarctica:Implications for detecting the surface environmental variations in the polar regions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2015年第2期6卷 285-296页

作者： Yoshiaki Ishihara Masaki Kanao Masa-yuki yamamoto Shigeru Toda Takeshi Matsushima Takahiko Murayama National Institute of Advanced Industrial Science and Technology National Institute of Polar Research Research Organization of Information and Systems Kochi University of Technology Faculty of Education Aichi Education University Faculty of Sciences Kyushu University Japan Weather Association

Characteristic infrasound waves observed at Antarctic stations demonstrate physical interaction involving environmental changes in the Antarctic continent and the surrounding oceans. A Chaparraltype infrasound sensor was installed at Syowa Station （SYO; 39°E, 69°S）, East Antarctica, as one of the projects of the International Polar Year （IPY2007-2008）. Data continuously recorded during the three seasons in 2008-2010 clearly indicate a contamination of the background oceanic signals （microbaroms） with peaks between 4 and 10 s observed during a whole season. The peak amplitudes of the microbaroms have relatively lower values during austral winters, caused by a larger amount of sea-ice extending around the Lutzow-Holm Bay near SYO, with decreasing ocean wave loading effects. Micro- baroms measurements are useful tool for characterizing ocean wave climate, complementing other oceanographic and geophysical data. A continuous monitoring by infrasound sensors in the Antarctic firmly contributes to the Comprehensive Nuclear-Test-Ban Treaty （CTBT） in the southern high latitude, together with the Pan-Antarctic Observations System （PAntOS） under the Scientific Committee on Antarctic Research （SCAR）. Detailed measurements of the infrasound waves in Antarctica, consequently, could be a new proxy for monitoring regional environmental change as well as the temporal climate variations in the polar regions.

关键词： lnfrasound Antarctica Microbaroms Environment Global network

Infrasonic Waves in Antarctica: A New Proxy for Monitoring Polar Environment

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2013年第4期4卷 797-802页

作者： Masa-yuki yamamoto Yoshiaki Ishihara Masaki Kanao Kochi University of Technology Kami-shi Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan National Institute of Polar Research Tokyo Japan

Characteristic infrasound waves are clearly recorded at Syowa Station (SYO), East Antarctica, involving physical interaction in surrounding environments at the continent and SouthernOcean. A Chaparral microphone type infrasound sensor is deployed at SYO during the International Polar Year (IPY2007-2008), the most diverse international science program held recently. Continuous recorded data in 2008-2010 indicate a contamination of background oceanic signals (microbaroms). The characteristic signals are identified as the “microbaroms” with peaks between 4 and 10 s in the records. The peak amplitudes of microbaroms may be enhanced by the extratropical cyclonic storms and wind noises in Southern Ocean. The microbaroms has relatively lower amplitudes during austral winters, which may be caused by the larger amount of the sea-ice extent around theLützow-HolmBaynear SYO, with decreasing the ocean wave loading effects. In addition, the large energy with intrinsic periods between 12 and 30 s are observable under excellent storm conditions, particularly in local winter. The oceanic effects appearing on infrasound data are modulated by the presence of sea-ice and explained by a relationship between the atmosphere-ocean-cryosphere systems. Microbaroms measurements could be a useful tool for characterizing ocean wave climate, as well as a new proxy for monitoring a regional environmental variation inAntarctica.

关键词： Infrasound Antarctica Microbaroms Environmental Monitoring Global Network

Seismic Tremors and Their Relation to Cryosphere Dynamics in April 2015 around the Lützow-Holm Bay, East Antarctica

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2017年第8期8卷 1025-1047页

作者： Masaki Kanao Takahiko Murayama Masa-yuki yamamoto Yoshiaki Ishihara National Institute of Polar Research Research Organization of Information and Systems Tokyo Japan Japan Weather Association Tokyo Japan Kochi University of Technology Kochi Japan Japan Aerospace Exploration Agency Kanagawa Japan

Characteristics and statistics of seismic tremors occurring during April 2015 were investigated by using short-period and broadband seismographs deployed at Syowa Station (SYO), in the Lützow-Holm Bay (LHB), East Antarctica. In order to examine a relationship between surface environments in particular cryosphere variation, the MODIS satellite images were utilized for comparison with the detected tremor events. Since a large volume of sea-ice was discharged during the April, together with several large icebergs passed through from the west to the east at northern edge of the fast sea-ice of LHB, it was expected to detect seismic tremors involving cryospehre dynamics. During the month, a total number of 49 tremor events including short duration ice shocks were identified. Majority of the events (N = 39) had their duration times more than 15 minutes, which were divided into both tremors and ice shocks on the basis of experienced definition at SYO. Cryospheric sources recorded by seismic tremors were classified into several origins (collision, calving, crevassing, crashing, etc.): “crevassing events” along the large cracks inside the fast sea-ice in LHB (04 April), “discharge events” of fast sea-ice from the Bay (07 April), “collision events” between iceberg and the edge of fast sea-ice (14 April), “crashing movement” between fragmentation of fast sea-ice and packed sea-ice (18 April), and other origins. In particular, strong amplitude tremors with harmonic overtones were assumed to be occurred independently from whether condition, because these overtone tremors were identified at less stormy days by comparison with infrasound data at SYO.

关键词： Seismic Tremors Ice Shocks Cryosphere Dynamics Sea-Ice Icebergs Lützow-Holm Bay Antarctica

Current and future trends in whole genome sequencing in cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2024年第1期21卷 16-20页

作者： yuki Katsuya Department of Experimental Therapeutics National Cancer Center Hospital5-1-1 TsukijiChuo-kuTokyo 104-0045Japan

Cancer remains a formidable global health challenge affecting millions of lives *** decades,conventional cancer treatments used a one-size-fits-all approach,overlooking the intricate genetic variations that drive *** emergence of cancer genomics has ushered in a new era of personalized and targeted cancer *** Human Genome Project,which was launched in 1990 and completed in 2003。

关键词： cancer Cancer annually

Infrasound Signals and Their Source Location Inferred from Array Deployment in the Lützow-Holm Bay Region, East Antarctica: January-June 2015

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2017年第2期8卷 181-188页

作者： Takahiko Murayama Masaki Kanao Masa-yuki yamamoto Yoshiaki Ishihara Japan Weather Association Tokyo Japan National Institute of Polar Research Research Organization of Information and Systems Tokyo Japan Kochi University of Technology Kochi Japan Japan Aerospace Exploration Agency Tokyo Japan

Characteristic features of infrasound waves observed in the Antarctic represent a physical interaction relating surface environment in the continental margin and surrounding Southern Ocean. Source location of several infrasound events is demonstrated by using combination of two array deployments along a coast of the Lützow-Holm Bay (LHB), East Antarctica, for data retrieving period in January-June 2015. These infrasound arrays being established in January 2013 clearly detected temporal variations in frequency content and propagation direction of the identified seven large events. Many of these sources are assumed to have cryoseismic origins;the ice-quakes associated with calving of glaciers, discharge of sea-ice, collision between sea-ice and icebergs around the LHB. Detail and continuous measurements of infrasound waves in the Antarctic are a proxy for monitoring regional environment as well as climate change in high southern latitude.

关键词： Infrasound Array Observations Lützow-Holm Bay East Antarctica Microbaroms Ice Shocks Surface Environment

Optimization of body configuration and joint-driven attitude stabilization for transformable spacecraft under solar radiation pressure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Astrodynamics 2024年第1期8卷 47-60页

作者： yuki Kubo Toshihiro Chujo Institute of Space and Astronautical Science Japan Aerospace Exploration AgencyKanagawa252-5210Japan Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo152-8550Japan

The solar sail is one of the most promising space exploration systems due to its theoretically infinite specific impulse achieved through solar radiation pressure(SRP).Recently,researchers have proposed“transformable spacecraft”capable of actively reconfiguring their body configurations using actuatable *** spacecraft,if used similarly to solar sails,are expected to significantly enhance orbit and attitude control capabilities owing to their high redundancy in control degrees of ***,controlling them becomes challenging due to their large number of inputs,leading previous researchers to impose strong constraints to limit their potential control *** study focuses on novel attitude control techniques for transformable spacecraft under *** developed two methods,namely,joint angle optimization to obtain arbitrary SRP force and torque,and momentum damping control driven by joint angle *** proposed methods are formulated in a general manner and can be applied to any transformable spacecraft comprising front faces that can predominantly receive the SRP on each *** validity of our proposed method is confirmed through numerical *** study contributes to making most of the high control redundancy of transformable spacecraft without the need for expendable propellants,thus significantly enhancing the orbit and attitude control capabilities.

关键词： solar sail transformable spacecraft attitude-joint coupled motion attitudestabilization

Effect of a combination of astaxanthin supplementation, heat stress, and intermittent reloading on satellite cells during disuse muscle atrophy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2018年第11期19卷 844-852页

作者： Toshinori YOSHIHARA Takao SUGIURA Nobuyuki MIYAJI yuki yamamoto Tsubasa SHIBAGUCHI Ryo KAKIGI Hisashi NAITO Katsumasa GOTO Daijiro OHMORI Toshitada YOSHIOKA Graduate School of Health and Sports Science Juntendo UniversityInzaiChiba 270-1695Japan Faculty of Education Yamaguchi UniversityYamaguchiYamaguchi 753-8513Japan Toyo Koso Kagaku Co.Ltd. UrayasuChiba 279-0041Japan Institute of Health and Sports Science Kurume UniversityKurumeFukuoka 839-8502Japan Institute of Liberal Arts and Science Kanazawa UniversityKanazawaIshikawa 920-1192Japan Faculty of Medicine Juntendo UniversityBunkyo-kuTokyo 113-0033Japan Graduate School of Health Sciences Toyohashi SOZO UniversityToyohashiAichi 440-8511Japan Department of Chemistry School of MedicineJuntendo UniversityInzaiChiba 270-1695Japan Hirosaki Gakuin University HirosakiAomori 036-8577Japan

We examined the effect of a combination of astaxanthin （AX） supplementation, repeated heat stress, and intermittent reloading （IR） on satellite cells in unloaded rat soleus muscles. Forty-nine male Wistar rats （8-week-old） were divided into control, hind-limb unweighting （HU）, IR during HU, IR with AX supplementation, IR with repeated heat stress （41.0-41.5 ℃ for 30 min）, and IR with AX supplementation and repeated heat stress groups. After the experimental period, the antigravitational soleus muscle was analyzed using an immunohistochemical technique. Our results revealed that the combination of dietary AX supplementation and heat stress resulted in protection against disuse muscle atrophy in the soteus muscle. This protective effect may be partially due to a higher satellite cell number in the atrophied soleus muscle in the IR/AX/heat stress group compared with the numbers found in the other groups. We concluded that the combination treatment with dietary AX supplementation and repeated heat stress attenuates soleus muscle atrophy, in part by increasing the number of satellite cells.

关键词： Antioxidant astaxanthin Disuse muscle atrophy Heat stress Satellite cell

Laser-assisted direct roller imprinting of large-area microstructured optical surfaces

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2024年第1期10卷 257-266页

作者： Keisuke Nagato Ken Takahashi yuki Yajima Masayuki Nakao Department of Mechanical Engineering Graduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

In this study,a high-throughput fabrication method called laser-assisted direct roller imprinting(LADRI)was developed to lower the cost of nanoimprinting large-area polymer films and to address problems associated with nanoimprinting,namely,microstructural damage and precision in flatness of entire *** LADRI,the laser directly heats the microstructured surface of the roller mold,which heats and melts the surface of a polymethyl methacrylate(PMMA)film to replicate the microstructures on the mold *** this study,the effects of laser power density,scanning speed,size of the microstructures,and contact pressure on the replication speed were investigated *** replication speed increased as the power and scanning speed ***,because the film required heating until it filled the entire depth of the microstructure,an appropriate replication speed was *** result was supported by simulation of the temperature distribution inside the mold and the PMMA using transient heat conduction *** demonstrate the applications of LADRI,two different optical surfaces were replicated:an antireflection(AR)structure with conical structures sized several hundred nanometers and a lightextraction structure with a microlens array(MLA)comprising 10μm lenses,for display and illumination,*** replication degree of the MLA was governed by the contact *** flow simulation indicated that the heat conduction and flow speeds of the melted PMMA surface were comparable within several tens of *** addition,the reflectivity of the AR structure decreased from 4 to 0.5%,and the light intensity of the light-extraction structure increased by a factor of 1.47.

关键词： microstructure roller conduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

翻转的日常

室内设计与装修 2017年第5期 128-131页

作者： Naoki Ono[日] yuki yamamoto[日]

或许你还记得CANVAS椅,那把靠墙放就可以真的坐下来的,长得像画的椅子,以及总放在桌子边缘,仿佛摇摇欲坠的PROTRUDE托盘,它们都是出自日本YOY设计工作室。

关键词：设计工作室 yamamoto 设计时间剪纸作品抱枕三井化学手工编织从一压制成型光影效果