68,212 research outputs found
Ultrasonic Sensor for Mobile Mini-Robots Using Pseudo-Random Codes
No full textKlahold J, Rautenberg J, Rückert U. Ultrasonic Sensor for Mobile Mini-Robots Using Pseudo-Random Codes. In: Rückert U, Sitte J, Witkowski U, eds. Proceedings of the 5th International Heinz Nixdorf Symposium: Autonomous Minirobots for Research and Edutainment (AMiRE01). Vol 97. Heinz Nixdorf Institut, Universität Paderborn; 2001: 225-232
Année de l’École de Nancy. G.-M. Witkowski - J. -G. Ropartz, Coll. Le Parnasse français, CD 001. Distribution ALIS
No full textWeber Edith. Année de l’École de Nancy. G.-M. Witkowski - J. -G. Ropartz, Coll. Le Parnasse français, CD 001. Distribution ALIS. In: Cahiers de sociologie économique et culturelle, n°36, 2001. p. 135
Stictodiscus manilensis D. M. Williams, P. A. Sims, & J. Witkowski 2021, sp. nov.
No full text<i>Stictodiscus manilensis</i> D.M.Williams, P.A.Sims, & J.Witkowski, <i>sp. nov.</i> <p> <b>Type:—</b> Philippines: Manila (‘ Manilla’), (holotype BM Adams F 1148 = Fig. 1, one specimen); BM 5473 (Deby, one specimen), BM 7431 (Deby, one specimen), BM 8865 (Deby, ‘ Manilla’ = Fig. 3, one specimen), BM 10652 (Deby, L.H. 826, two specimens), BM 45641 (Sturt, A578, three specimens), BM 45863 (Sturt A800, one specimen). Singapore: BM 10435 (Deby, L.H. 547, one specimen).</p> <p>Valves circular with flat valve face; mantle distinctive. Valve with small central annulus, radiating network of ‘siliceous bars’ leading to areolae, mostly biseriate. Raised siliceous thickenings surround series of radiating inner areolae, becoming more conspicuous towards valve mantle. No other surface structures.</p>Published as part of <i>Williams, David M., Sims, Pat A. & Witkowski, Jakub, 2021, Notes on the diatom collection of the Natural History Museum, London (BM) V: (a) ' Stictodiscus manillensis' nom. nud., (b) Stictodiscus pantocsekii and ' Stictodiscus pantocsekii var. minor', (c) a note on the name ' Stictodiscella'; and (d) some comments on Jósef Pantocsek's Beiträge zur Kenntnis der Fossilen Bacillarien, pp. 167-174 in Phytotaxa 507 (2)</i> on page 169, DOI: 10.11646/phytotaxa.507.2.4, <a href="http://zenodo.org/record/5425611">http://zenodo.org/record/5425611</a>
Cymatosirella taylorii Dabek & Witkowski 2013, sp. nov.
No full text<i>Cymatosirella taylorii</i> Dąbek & Witkowski <i>sp. nov.</i> (Figs 44–51 [LM], Figs 52–58 [SEM]) <p>Frustules rectangular in girdle view with undulated outline. Valves lanceolate to elliptical, 4–13 µm long and 1–4 µm wide. Central part of valve face and apices elevated. Valve surface areolated, with ca. 50 areolae in 10 µm. Areolae distributed over the whole valve face.</p> <p> <b>Type:</b> — SOUTH AFRICA. Western Cape Province: eastern part of Langebaan Lagoon, Saldanha Bay, sandy sediment from the intertidal sandbank (33°6’788’’S; 18°2’631’’E) collected on 19 th February 2011 by Dąbek, Witkowski & Archibald (SZCZ 17582, holotype!).</p> <p> <b>Habitat:</b> —The eastern part of Langebaan Lagoon is a shallow, sandy tidal pool. High and low tide occur twice a day. Sea surface water temperature exceeds 18° C</p> <p> <b>Etymology:</b> —Named after and dedicated to our friend and prominent South African diatomologist Dr. Jonathan Taylor (North-West University, Potchefstroom, South Africa).</p> <p> <b>Observations:</b> —The frustules are rectangular in girdle view with an undulated outline (Figs 44–47, 52). Cells are predominantly solitary, but occasionally two cells were found joined together (Fig. 44). The girdle is broad, and composed of numerous bands bearing one row of fine puncta (Fig. 52). The valves are lanceolate to elliptical, 4–13 µm long and 1–4 µm wide (Figs 48–51, 53). The central part of the valve face and apices are elevated (Figs 54, 56). The valve surface is strongly ornamented with areolae, ca. 50 in 10 µm (Figs 53–56). Near the central elevation, areolae are randomly distributed; further towards the apices they are arranged in longitudinal rows (Figs 53, 55, 56). Occlusions have not been observed. Each valve bears two ocelluli, composed of 7–10 porelli, with 1–2 central ones (Figs 57, 58). The ocelluli are surrounded by a hyaline ring of silica (Figs 53, 55, 57). No areolae occur near the ocelluli (Figs 53, 57). Spines were observed only rarely. Processes, pili, fascia nor pseudosepta have not been observed.</p> <p> <b>Ecology and geography:</b> — <i>Cymatosirella taylorii</i> has been found in only one sandy sample (SZCZ 17582, the holotype) from an intertidal sandbank in the eastern part of the Langebaan Lagoon. Only a dozen valves have been found. This species most probably belongs to the epipsammon.</p>Published as part of <i>Dąbek, Przemysław, Sabbe, Koen, Witkowski, Andrzej, Archibald, Colin, Kurzydłowski, Krzyszof J. & Zgłobicka, Izabela, 2013, Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae, pp. 42-56 in Phytotaxa 121 (1)</i> on page 50, DOI: 10.11646/phytotaxa.121.1.2, <a href="http://zenodo.org/record/5079466">http://zenodo.org/record/5079466</a>
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Case Report: melanoma and melanocytic nevus differentiation with reflectance confocal microscopy. [v1; ref status: indexed, http://f1000r.es/5mr]
No full textHistorically, melanoma has been typically diagnosed by naked-eye examination and confirmed with invasive biopsy. However, recently the use of reflectance confocal microscopy enables non-invasive bedside diagnosis of clinically equivocal lesions. We present a case in which reflectance confocal microscopy was used to evaluate two skin lesions in the same patient confirming the diagnosis of a melanoma and potentially avoiding invasive biopsy in the second benign melanocytic lesion. Clinicians should be aware of the availability of new non-invasive technologies that can aid in early diagnosis of malignant skin tumors and potentially reduce the number of benign lesion excisions
Extension Module for Application-Specific Hardware on the Minirobot Khepera
No full textNiemann J-C, Witkowski U, Porrmann M, Rückert U. Extension Module for Application-Specific Hardware on the Minirobot Khepera. In: Autonomous Minirobots for Research and Edutainment (AMiRE 2001). Paderborn, Germany; 2001: 279-288.In this paper a hardware extension for the minirobot Khepera is presented. We are researching into algorithms for neural data processing and their hardware implementation by increasingly using the minirobot Khepera. This robot is supposed to record its environment continuously and to map obstacles. This is the basis for the implementation of an efficient navigational system. As the algorithms in question are complex and since the microcontroller on the Khepera does not possess the necessary processing capacity, it is requisite to develop a discrete hardware module that extends the Khepera
Letter from Carl Hayden to M. J. Riordan
No full textLetter from Carl Hayden to M. J. Riordan expressing his support for Coconino County in turning over the Bright Angel Trail to the federal government
A Reconfigurable SOM Hardware Accelerator
No full textPorrmann M, Franzmeier M, Kalte H, Witkowski U, Rückert U. A Reconfigurable SOM Hardware Accelerator.A dynamically reconfigurable hardware accelerator for self-organizing
feature maps is presented. The system is based on the universal rapid prototyping system RAPTOR2000 that has been developed by the authors. The modular prototyping system is based on XILINX FPGAs and is capable of emulating hardware implementations with a complexity of more than 24 million system
gates. RAPTOR2000 is linked to its host – a standard personal computer or
workstation – via the PCI bus. For the simulation of self-organizing maps a module has been designed for the RAPTOR2000 system, that embodies an FPGA of the Xilinx Virtex series and optionally up to 128 MBytes of SDRAM. A speedup of about 50 is achieved with five FPGA modules on the RAPTOR2000 system compared to a software implementation on a state of the art personal computer for typical applications of self-organizing maps
Letter from M. J. Riordan, Arizona Lumber and Timber Company, to Carl Hayden
No full textLetter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail
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