176 research outputs found
Chodsigoa parca G. M. Allen 1923
No full text170. Lowe’s Brown-toothed Shrew Chodsigoa parca French: Musaraigne étriquée / German: Lowe-Braunzahnspitzmaus / Spanish: Musarana de dientes marrones de Lowe Other common names: Lowe's Shrew Taxonomy. Chodsigoa smithii parca G. M. Allen, 1923, “Ho-mu-shu Pass [= Hong- mushu, Baoshan], western Yunnan, Chi- na, 8000 feet [= 2438 m].” Chodsigoa parca used to include furva as a subspecies, which has been re-elevated to full species. Chodsigoa parca has been split into two species, and eastern populations were recognized as a new species, C. hoffmanmni. Taxonomic status of subspecies lowei needs to be reassessed. Two subspecies recognized. Subspecies and Distribution. C.p.parcaG.M.Allen,1923—SWChina(Yunnan),NE&EMyanmar,andNThailand,WoftheMekongRiver. C. p. lower Osgood, 1932 — known only from the type locality in Chapa (= Sa Pa), Lao Cai Province, NW Vietnam. Descriptive notes. Head-body 62-77 mm, tail 77-99 mm, hindfoot 15-18 mm. No specific data are available for body weight. Condylo-incisive lengths are 20-1-20-9 mm, and tooth rows are 8-6-9 mm. Lowe’s Brown-toothed Shrew is similar to Hoffmann’s Brown-toothed Shrew (C. hoffmanni) but larger. Dorsal pelageis slate-gray, and ventral pelageis palerslate-gray. Tail is longer than head-body length and bicolored; its dorsal surface is brown, and ventral surface is creamy white. Tuft of slightly longer hair occurs on tip oftail. Braincase is dome-shaped. Rostrum tapers gradually in premaxillary region. There are three upper unicuspids. Habitat. Moist forests at elevations of 1500-3000 m. In western Yunnan, Lowe’s Browntoothed Shrew is most common at elevations of 2400-2600 m in evergreen broadleaved forest. Food and Feeding. No information. Breeding. No information. Activity patterns. Most Lowe’s Brown-toothed Shrews were captured at night. It is well adapted for running and jumping. Movements, Home range and Social organization. No information. Status and Conservation. Classified as Least Concern on The IUCN Red List. In northern Myanmar (= Burma), Lowe’s Brown-toothed Shrew is threatened by deforestation. Presumably, populations are not declining in south-western China and northern Thailand. Bibliography. Chen Zhongzheng et al. (2017), Hoffmann (1985).Published as part of Russell A. Mittermeier & Don E. Wilson, 2018, Soricidae, pp. 332-551 in Handbook of the Mammals of the World – Volume 8 Insectivores, Sloths and Colugos, Barcelona :Lynx Edicions on page 454, DOI: 10.5281/zenodo.687084
Experimental Activities to Support Future Space-based High Throughput Communication Infrastructures
No full textModulation instability and conservation of energy:toward a new model
No full textL'articolo analizza la propagazione in regime nonlineare di un segnale ottico CW in presenza di una "piccola" perturbazione. In letteratura sono presenti lavori che specificano i parametri fisici che regolano l'interazione tra il segnale CW e la perturbazione ma non si hanno indicazioni relative ai limiti di applicabilità dei modelli proposti. Obiettivo principale di questo lavoro è rappresentato dalla definizione dei parametri che "attivano" l'instabilità di modulazione e regolano il regime di propagazione nonlineare. A tal fine, il regime di propagazione nonlineare è analizzato vincolandolo al principio di conservazione dell'energia
Soriculus parca
No full textSoriculus parca (G. M. Allen, 1923). Am. Mus. Novitates, 100:6. TYPE LOCALITY: "Ho-mu-shu Pass, Western Yunnan, China, 8000 feet." DISTRIBUTION: SW China, N Burma and Thailand and N Vietnam. SYNONYMS: furva, lowei. COMMENTS: Formerly included in smithii, but retained as a separate species by Hoffmann (1985b), with lowei and furva as tentative subspecies.Published as part of Rainer Hutterer, 1993, Order Insectivora, pp. 69-130 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 123, DOI: 10.5281/zenodo.735308
Tropospheric Scintillation and Simultaneous Rain Attenuation at 19.7 GHz and 39.4 GHz for Tito Scalo and Spino d'Adda
No full textMater Parca / Jiwaña Mama
No full text[ES] Proyecto de investigación, creación y producción fotográfica y videográfica que se instaura como un archivo visual de memoria, gestado desde la autobiografía como un homenaje a la cuidadora de infancia de la autora, Hilda Callasaya Mamani, mujer indígena aymará, trabajadora del hogar y dirigente comunitaria.
La propuesta se nutre desde diversos campos de investigación como son la fotografía, el audiovisual, la teoría feminista, los estudios decoloniales, la sociología, la antropología y la cosmovisión aymara.Rivera Lucero, G. (2022). Mater Parca / Jiwaña Mama. Universitat Politècnica de València. https://riunet.upv.es/handle/10251/186390TFG
Nucleos: a web server for the identification of nucleotide binding sites in protein structures
No full textNucleos is a web server for the identification of nucleotide-binding sites in protein structures. Nucleos compares the structure of a query protein against a set of known template 3D binding sites representing nucleotide modules, namely the nucleobase, carbohydrate and phosphate. Structural features, clustering and conservation are used to filter and score the predictions. The predicted nucleotide modules are then joined to build whole nucleotide-binding sites, which are ranked by their score. The server takes as input either the PDB code of the query protein structure or a user-submitted structure in PDB format. The output of Nucleos is composed of ranked lists of predicted nucleotide-binding sites divided by nucleotide type (e.g. ATP-like). For each ranked prediction, Nucleos provides detailed information about the score, the template structure and the structural match for each nucleotide module composing the nucleotide-binding site. The predictions on the query structure and the template-binding sites can be viewed directly on the web through a graphical applet. In 98% of the cases, the modules composing correct predictions belong to proteins with no homology relationship between each other, meaning that the identification of brand-new nucleotide-binding sites is possible using information from non-homologous proteins. Nucleos is available at http://nucleos.bio.uniroma2.it/nucleos/
FOUR-YEAR PROPAGATION RESULTS FROM THE ASI ALPHASAT GROUND STATIONS IN TITO SCALO AND SPINO D’ADDA
No full textThe Alphasat Aldo Paraboni experiment (in memory of the late professor of Politecnico di Milano who greatly contributed to conceive and realize it) is the most recent initiative of ASI, in collaboration with ESA, aimed at characterizing the radio communication channel at Ka band and Q band for the design and operation of future High Throughput Satellite systems. The Alphasat Aldo Paraboni experiment features two beacons at Ka (19.701 GHz) and Q (39.402 GHz) band, both hosted aboard the Alphasat geosynchronous satellite (max orbit inclination equal to 3 degrees), operated by Inmarsat for its commercial services. The ASI Alphasat ground stations of Tito Scalo (South of Italy) and Spino d’Adda (North of Italy), equipped with a monopulse auto tracking system, measure the co-polar signal at 19.7 and 39.4 GHz with a 4.2 m diameter antenna at an average elevation angle of 42.1° (Tito Scalo) and 35.5° (Spino d’Adda). A 16-Hz sampling rate is implemented to characterize scintillation effects, with a dynamic range of more than 50 dB. A profiler radiometer (RPG-HATPRO), a tipping bucket rain gauge and an ancillary meteorological station complete the equipment of both stations. This contribution presents four years (2017-2020) of attenuation and rain intensity statistics collected in the two ASI ground stations. Both first-order and second order statistics are presented and comparisons with prediction models are carried out
Q/V-band satellite communication experiments on channel estimation with Alphasat Aldo Paraboni P/L
No full textThe Alphasat Aldo Paraboni communication experimental campaign is based on a transparent Q/V band transponder hosted as a piggy-back on a GEO satellite. Together with the transparent payload, two beacons having European coverage, one in Ka-band and one in Q/V-band, are used to perform propagation experiments. The transparent payload has three spot beams, two over Italy and one over Austria. The University of Rome Tor VergataCTIF Italy is the Principal Investigator for the communication experiments and is in charge of operating the payload and the Italian ground stations. The Alphasat Aldo Paraboni experiment is an important step toward the development of future High Throughput Satellite (HTS) systems, able to support hundreds of gigabit/s or terabit/s connectivity. These systems will require: a) use of frequency bands beyond Ka (i.e. Q, V and W bands); b) enhanced frequency reuse; c) use of Propagation Impairments Mitigation Techniques (PIMT). Alphasat Aldo Paraboni payload allows us to perform, for the first time, communication experiments over a Q/V band satellite link with adaptive PIMT, testing: Channel Estimation, Adaptive Coding and Modulation (ACM), up-link power control (ULPC) and space diversity. This paper presents the first results of the communication experiments campaign
Frequency Scaling from Ka Band to Q Band: Comparison of Two Approaches
No full textTo satisfy the need of higher data rate requirements, SatCom systems are gradually shifting to operate at higher frequencies. This increase in frequency can reduces the availability of Earth-satellite links because of the stronger effect that the troposphere has on the signal. Therefore, a simple static margin to cope with tropospheric impairments is no longer sufficient, and more sophisticated fade mitigation techniques must be adopted. One such technique is the uplink power control. Knowing the state of the link (i.e. the attenuation level) in real time at a particular frequency, which can be achieved via a beacon signal being transmitted by the satellite to the ground station, the attenuation level at the uplink frequency can be estimated using frequency scaling models. Consequently, the uplink transmission power can be modified to overcome the encountered attenuation. This research activity is carried out in the context of the Alphasat Aldo Paraboni propagation campaign. Data are collected from the Tito Scalo (40.60°N 15.7°E) and Spino D’Adda (45.4°N 9.5°E) ground stations, which receive unmodulated continuous wave beacon signals at 19.7 GHz and 39.4 GHz from the ALPHASAT geostationary satellite. Such data is used to investigate the accuracy of instantaneous frequency scaling approaches. In particular, two models are applied to estimate the attenuation at 39.4 GHz from the one at 19.7 GHz: the empirical model proposed by Drufuca and a more physically-based approach relying on the prediction of the specific rain attenuation at both frequencies from the concurrent rain rate information. The effectiveness of the two models is quantified by comparing the estimated attenuation at 39.4 GHz with the measured one. To this aim, data collected during two full years of experimental campaign (2015 and 2016) is used
- …
