Geodesy reference points within Syowa Station, Antarctica, and their local geodetic ties

In order to study geodynamics in relation to atmospheric, oceanographic and glaciological interactions on a global scale, adequate distribution of precise geodesy stations over the Earth is important. Syowa Station (69.0°S , 39.6°E ), Antarctica, serves as one of the observatories in the Southern Hemisphere. This report briefly summarizes the location coordinates of the geodetic sensors, and chronology of related activity as of 2005, based on standardized format sheets for each sensor monument. Exchange of these formatted sheets among Antarctic stations will give us a data base for reviewing and archiving geodetic activity in Antarctica. Local geodetic ties among their monument marks are updated from the results given by M. Kanao et al. (J. Geod. Soc. Jpn., 41, 357, 1995), including later surveying with improved accuracy

Tsukuba 32-m VLBI Station

The Tsukuba 32-m VLBI station is operated by the Geospatial Information Authority of Japan. This report summarizes activities of the Tsukuba 32-m VLBI station in 2012. More than 200 sessions were observed with the Tsukuba 32-m and other GSI antennas in accordance with the IVS Master Schedule of 2012. We have started installing the observing facilities that will be fully compliant with VLBI2010 for the first time in Japan

The first year of Antarctic VLBI observations

We are undertaking a series of geodetic VLBI observations between the Syowa Station 11-m antenna in Antarctica, and the 26-m antennas in Hobart Tasmania and Hartebeesthoek South Africa. These observations are the beginning of our campaign to monitor the motion and stability of the Antarctic plate. We describe here the results of the first year\u27s observations made during the southern summer and winter of 1998. Two mutually incompatible recording systems, K4 and S2, are used. The Mitaka FX Correlator was used to correlate these data. By using software called CALC3/MSOLV, the mean position of the antenna\u27s geodetic reference point was found to be X=1766194.152±0.006m, Y=1460410.923±0.005m and Z=- 5932273.329±0.015m at the epoch of 1998.9 in the International Terrestrial Reference Frame 2000 (ITRF2000) system. From a comparison with measurements made with other space geodetic techniques we estimate that our results have typical uncertainties of no more than 2 to 3cm in each coordinate

The result of VLBI observations carried out at Syowa Station

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） 統計数理研究所 ３階セミナー

Cu₂NiSnS₄ Nanoparticles Supported on rGO for Dual Frequency Range Electromagnetic Shielding

The development of advanced electromagnetic wave absorbing materials capable of simultaneous dual/multiple frequency bands has received widespread attention due to their potential to mitigate electromagnetic interference and enhance communication technologies. Herein, we report efficient dual frequency band electromagnetic wave (EMW) absorption from a hybrid of high-purity Cu2NiSnS4 (CNTS) nanoparticles and reduced graphene oxide (rGO) (CNTS/rGO). The surface morphology and physicochemical properties of prepared materials (pure CNTS and CNTS/rGO with different rGO filling ratios) were characterized using powder X-ray diffraction (PXRD), Raman spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and scanning TEM (STEM) analysis. The electromagnetic-wave-absorption performances were conducted using a vector network analyzer with the frequency ranging between 2 and 18 GHz. The complex permittivity, magnetic permeability, dielectric loss tangent, magnetic loss tangent, dielectric relaxation phenomena (Cole–Cole plot), eddy current loss parameter, and attenuation constant values related to the electromagnetic wave absorption of the materials have been studied. The experimental results confirmed that CNTS and CNTS/rGO composite materials can absorb different electromagnetic wave frequency bands. Significantly, CNTS/rGO (50%) exhibits exceptional electromagnetic-wave-absorption properties across dual frequency bands with the optimal absorption loss of −38.2 dB at 17.1 GHz and a broad absorption peak of −10.4 dB at 5.6 GHz, offering significant potential for use in various technological applications, including stealth technology, wireless communication, and radar systems. The enhanced microwave-absorption properties of the material can be attributed to the successful design of a well-dispersed heterostructure of CNTS/rGO containing different phases, including a hybrid of dielectric and magnetic material along with the efficient dielectric loss, magnetic loss, and their synergistic contribution in the electromagnetic wave absorption. The outcomes of this research can lead to technological advancements, improved functionality, and future direction to pressing challenges in today’s interconnected world

Conformational switch of angiotensin II type 1 receptor underlying mechanical stress-induced activation

The angiotensin II type 1 (AT1) receptor is a G protein-coupled receptor that has a crucial role in the development of load-induced cardiac hypertrophy. Here, we show that cell stretch leads to activation of the AT1 receptor, which undergoes an anticlockwise rotation and a shift of transmembrane (TM) 7 into the ligand-binding pocket. As an inverse agonist, candesartan suppressed the stretch-induced helical movement of TM7 through the bindings of the carboxyl group of candesartan to the specific residues of the receptor. A molecular model proposes that the tight binding of candesartan to the AT1 receptor stabilizes the receptor in the inactive conformation, preventing its shift to the active conformation. Our results show that the AT1 receptor undergoes a conformational switch that couples mechanical stress-induced activation and inverse agonist-induced inactivation

The IVS data input to ITRF2014

2015ivs..data....1N - GFZ Data Services, Helmoltz Centre, Potsdam, GermanyVery Long Baseline Interferometry (VLBI) is a primary space-geodetic technique for determining precise coordinates on the Earth, for monitoring the variable Earth rotation and orientation with highest precision, and for deriving many other parameters of the Earth system. The International VLBI Service for Geodesy and Astrometry (IVS, http://ivscc.gsfc.nasa.gov/) is a service of the International Association of Geodesy (IAG) and the International Astronomical Union (IAU). The datasets published here are the results of individual Very Long Baseline Interferometry (VLBI) sessions in the form of normal equations in SINEX 2.0 format (http://www.iers.org/IERS/EN/Organization/AnalysisCoordinator/SinexFormat/sinex.html, the SINEX 2.0 description is attached as pdf) provided by IVS as the input for the next release of the International Terrestrial Reference System (ITRF): ITRF2014. This is a new version of the ITRF2008 release (Bockmann et al., 2009). For each session/ file, the normal equation systems contain elements for the coordinate components of all stations having participated in the respective session as well as for the Earth orientation parameters (x-pole, y-pole, UT1 and its time derivatives plus offset to the IAU2006 precession-nutation components dX, dY (https://www.iau.org/static/resolutions/IAU2006_Resol1.pdf). The terrestrial part is free of datum. The data sets are the result of a weighted combination of the input of several IVS Analysis Centers. The IVS contribution for ITRF2014 is described in Bachmann et al (2015), Schuh and Behrend (2012) provide a general overview on the VLBI method, details on the internal data handling can be found at Behrend (2013)