The whip spider collection (Arachnida, Amblypygi) held in the Natural History Museum Vienna, Austria

We present data and remarks on the history and contents of the whip spider collection housed in the Natural History Museum of Vienna, Austria. The collection comprises a total of 167 specimens from 4 families, 10 genera and 27 species. It includes types of four species: Charinus ioanniticus (Kritscher, 1959), Damon brachialis Weygoldt, 1999, Phrynus parvulus (Pocock, 1902) and Paraphrynus mexicanus (Bilimek, 1867). Short notes on interesting objects and former curators are provided as well as an appendix with a list of species kept alive by Michael Seiter

In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer

The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximately 220 km. Autonomous controls that lock the laser frequency to a cavity reference and establish the 5 degrees of freedom two-way laser link between remote spacecraft succeeded on the first attempt. Active beam pointing based on differential wave front sensing compensates spacecraft attitude fluctuations. The LRI has operated continuously without breaks in phase tracking for more than 50 days, and has shown biased range measurements similar to the primary ranging instrument based on microwaves, but with much less noise at a level of 1 nm/Hz at Fourier frequencies above 100 mHz. © 2019 authors. Published by the American Physical Society

Die Geißelspinnensammlung (Arachnida, Amblypygi) des Naturhistorischen Museums Wien, Österreich

We present data and remarks on the history and contents of the whip spider collection housed in the Natural History Museum of Vienna, Austria. The collection comprises a total of 167 specimens from 4 families, 10 genera and 27 species. It includes types of four species: Charinus ioanniticus (Kritscher, 1959), Damon brachialis Weygoldt, 1999, Phrynus parvulus (Pocock, 1902) and Paraphrynus mexicanus (Bilimek, 1867). Short notes on interesting objects and former curators are provided as well as an appendix with a list of species kept alive by Michael Seiter.Wir präsentieren Daten und Anmerkungen zur Geschichte und dem Inhalt der Geißelspinnen-Sammlung des Naturhistorischen Museums Wien, Österreich. Die Sammlung umfasst 167 Individuen aus 4 Familien, 10 Gattungen und 27 Arten und beinhaltet Typen von vier Arten: Charinus ioanniticus (Kritscher, 1959), Damon brachialis Weygoldt, 1999, Phrynus parvulus (Pocock, 1902) and Paraphrynus mexicanus (Bilimek, 1867). Die Angaben werden durch kurze Anmerkungen zu interessanten Objekten und früheren Kuratoren sowie einem Appendix mit der Liste der von Michael Seiter lebend gehaltenen Arten ergänzt

A new species of the South East Asian genus Sarax Simon, 1892 (Arachnida: Amblypygi: Charinidae) and synonymization of Sarax mediterraneus Delle Cave, 1986

Seiter, Michael, Wolff, Jonas, Hörweg, Christoph (2015): A new species of the South East Asian genus Sarax Simon, 1892 (Arachnida: Amblypygi: Charinidae) and synonymization of Sarax mediterraneus Delle Cave, 1986. Zootaxa 4012 (3): 542-552, DOI: http://dx.doi.org/10.11646/zootaxa.4012.3.

Four years operations of Inter-satellite and SpaceGround Optical links

During the past four years, the laser communication terminal on board of Alphasat GEO-stationary satellite has achieved the successful execution of more than 1300 optical links which implies more than 24.000 tasks for the planning system. This laser terminal in combination with a Ka-Band system constitutes the TDP1 technology demonstrator. Approximately half of the links were inter-satellite optical links, using the Sentinels low orbit satellites of the EU Copernicus program (S1A, S1B, S2A and S2B) as communication partner with the aim of supporting in orbit commissioning activities and TDP1 experimentation purposes. The other half of the links used the transportable adaptive optical ground station of the DLR (T-AOGS [2]) located currently at Tenerife, Spain as counter terminal. These optical satellite to ground links prepare the way not only to GEO feeder links, but also for connecting the space segment to HAPs, airborne terminals or LEO direct to earth links. In contrast to pure inter satellite links the satellite to ground links involve the atmosphere and local weather conditions. Adopting the operational concept established for inter satellite links, a certain percentage of the planned links cannot be conducted (e.g. due to clouds). The conducted links were used to characterizing the T-AOGS, characterize the atmospheric conditions as well as optimize and test coding schemes. Most of the tasks executed by the LCTs and the Ka-Band have been based in the TESAT input delivered to the MCC (operated by DLR GSOC), further processed and finally transferred to the spacecraft control center

[Stammbuch Sigismund Heinrich Hüls] / Sigismundus Henricus Hülsius

[STAMMBUCH SIGISMUND HEINRICH HÜLS] / SIGISMUNDUS HENRICUS HÜLSIUS [Stammbuch Sigismund Heinrich Hüls] / Sigismundus Henricus Hülsius ( - ) Einband ( - ) Besitzvermerk (7v 8r) Steenbock, Friedrich; Blatt 89 (88v 89r) Falckner, Johann Christoph; Blatt 97 (96v 97r) Hammer, Georg Reichard; Blatt 103 (102v 103r) Linck, Heinrich; Blatt 189 (188v 189r) Holtzschuher, Christoph Engelhard; Blatt 191 (190v 191r) Rollwagen, Jacob Friedrich; Blatt 200 (200v 201r) Beyer, Andreas; Blatt 213 (212v 213r) Frümel, Martin; Blatt 216 (215v 216r) Schmid, Balthasar; Blatt 227 (226v 227r) Hartmann, Franziskus Thomas; Blatt 231 (230v 231r) Erasmi, Otto Johann; Blatt 231 (231v 232r) Evers, Gerhard; Blatt 232 (231v 232r) Kininmondt, Robert; Blatt 234 (233v 234r) Persius von Lonsdorff, Ernst Julius; Blatt 235 (234v 235r) Stauffer, Johann Ferdinand; Blatt 245 (244v 245r) Camerarius, Benedict; Blatt 248 (247v 248r) Hoffmann, Christian; Blatt 261 (260v 261r) Wirz, Adolph; Blatt 269 (268v 269r) Finck, Johann Martin; Blatt 272 (271v 272r) Seiter, Johann Andreas; Blatt 273 (272v 273r) Erdinger, Wolfgang Friedrich; Blatt 276 (275v 276r) Walther, Christian; Blatt 277 (276v 277r) Iselin, German; Blatt 278 (277v 278r) Müller, Johann Daniel; Blatt 281 (280v 281r) Unbekannt, Blatt 282 (281v 282r) Sommerfeld, Alexander von; Blatt 283 (282v 283r) Gumpelzheimer, Johann Albert; Blatt 284 (283v 284r) Unbekannt, Blatt 284v (284v 285r) Löffelholtz von Colberg, Johann Dietrich; Blatt 285 (284v 285r) Schlüsselfelder, Johann Carl; Blatt 286 (285v 286r) Fedeler, Conrad; Blatt 287 (286v 287r) Wolff, Jacob; Blatt 288 (287v 288r) Fetzer, Johann Paul; Blatt 290 (289v 290r) Reich, Jacob Christoph; Blatt 291 (291v 292r) Mueg, Georg Friedrich; Blatt 292 (291v 292r) Reich, Joachim; Blatt 292 (292v 293r) Endter, Johann Michael; Blatt 294 (293v 294r) Fuchs, Georg Ferdinand; Blatt 294 (294v 295r) Cölln, Johann Hieronymus von; Blatt 295 (294v 295r) Lutz, Johann Joachim; Blatt 296 (295v 296r) Dreher, Georg Paul; Blatt 296 (296v 297r) Gammersfelder, Joachim Sigismund; Blatt 297 (296v 297r) Mair, Johann Michael; Blatt 297 (297v 298r) Krannöst, Gottlieb; Blatt 298 (297v 298r) Götsche, Michael; Blatt 299 (298v 299r) Haller von Hallerstein, Jakob Bilibald; Blatt 300 (300v 301r) Ebner, Friedrich Wilhelm; Blatt 301 (300v 301r) Cöper, Heinrich; Blatt 302 (301v 302r) Nicolai, Heinrich; Blatt 303 (302v 303r) Wurffbain, Sigismund Ludwig; Blatt 325 (324v 325r) Wetzel, Johann Caspar; Blatt 325 (324v 325r

Distribution and mineralogy of carbonate sediments on Antarctic shelves

We analyzed 214 new core-top samples for their CaCO3 content from shelves all around Antarctica in order to understand their distribution and contribution to the marine carbon cycle. The distribution of sedimentary CaCO3 on the Antarctic shelves is connected to environmental parameters where we considered water depth, width of the shelf, sea-ice coverage and primary production. While CaCO3 contents of surface sediments are usually low, high (> 15%) CaCO3 contents occur at shallow water depths (150–200 m) on the narrow shelves of the eastern Weddell Sea and at a depth range of 600–900 m on the broader and deeper shelves of the Amundsen, Bellingshausen and western Weddell Seas. Regions with high primary production, such as the Ross Sea and the western Antarctic Peninsula region, have generally low CaCO3 contents in the surface sediments. The predominant mineral phase of CaCO3 on the Antarctic shelves is low-magnesium calcite. With respect to ocean acidification, our findings suggest that dissolution of carbonates in Antarctic shelf sediments may be an important negative feedback only after the onset of calcite undersaturation on the Antarctic shelves. Macrozoobenthic CaCO3 standing stocks do not increase the CaCO3 budget significantly as they are two orders of magnitude lower than the budget of the sediments. This first circumpolar compilation of Antarctic shelf carbonate data does not claim to be complete. Future studies are encouraged and needed to fill data gaps especially in the under-sampled southwest Pacific and Indian Ocean sectors of the Southern Ocean