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Search Results: 1 - 10 of 22595 matches for " Roberto Menzel "
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Bis{4-[(3-phenylallylidene)amino]cyclohexyl}methane trichloromethane solvate
Roberto Menzel,Angela G?bel,Helmar G?rls,Wolfgang Imhof
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808037380
Abstract: The title compound, C31H38N2, was prepared from bis(4-aminocyclohexyl)methane and two equivalents of cinnamaldehyde. The cyclohexyl groups each show a chair conformation and the α,β-unsaturated imine side chains are all-trans configured. Two molecules of the title compound as well as two trichloromethane solvent molecules are present in the asymmetric unit. The solvent molecules interact with the diimines via weak C—H...N hydrogen bonds.
Serial Position Learning in Honeybees
Randolf Menzel
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004694
Abstract: Learning of stimulus sequences is considered as a characteristic feature of episodic memory since it contains not only a particular item but also the experience of preceding and following events. In sensorimotor tasks resembling navigational performance, the serial order of objects is intimately connected with spatial order. Mammals and birds develop episodic(-like) memory in serial spatio-temporal tasks, and the honeybee learns spatio-temporal order when navigating between the nest and a food source. Here I examine the structure of the bees’ memory for a combined spatio-temporal task. I ask whether discrimination and generalization are based solely on simple forms of stimulus-reward learning or whether they require sequential configurations. Animals were trained to fly either left or right in a continuous T-maze. The correct choice was signaled by the sequence of colors (blue, yellow) at four positions in the access arm. If only one of the possible 4 signals is shown (either blue or yellow), the rank order of position salience is 1, 2 and 3 (numbered from T-junction). No learning is found if the signal appears at position 4. If two signals are shown, differences at positions 1 and 2 are learned best, those at position 3 at a low level, and those at position 4 not at all. If three or more signals are shown these results are corroborated. This salience rank order again appeared in transfer tests, but additional configural phenomena emerged. Most of the results can be explained with a simple model based on the assumption that the four positions are equipped with different salience scores and that these add up independently. However, deviations from the model are interpreted by assuming stimulus configuration of sequential patterns. It is concluded that, under the conditions chosen, bees rely most strongly on memories developed during simple forms of associative reward learning, but memories of configural serial patterns contribute, too.
Die Entwicklung der Senologie in sterreich - eine Erfolgsgeschichte. Ein Salut für Ernst Kubista
Menzel C
Speculum - Zeitschrift für Gyn?kologie und Geburtshilfe , 2009,
Abstract:
First descriptions of copepodid stages, sexual dimorphism and intraspecific variability of Mesocletodes Sars, 1909 (Copepoda, Harpacticoida, Argestidae), including the description of a new species with broad abyssal distribution
Lena Menzel
ZooKeys , 2011, DOI: 10.3897/zookeys.96.1496
Abstract: Mesocletodes Sars, 1909a encompasses 37 species to date. Initial evidence on intraspecific variability and sexual dimorphism has been verified for 77 specimens of Mesocletodes elmari sp. n. from various deep-sea regions, and ontogenetic development has been traced for the first time. Apomorphies are a strong spinule-like pinna on the mx seta that is fused to the basis, P2–P4 exp3 proximal outer seta lost, P1–P4 enp2 extremely elongated, furcal rami elongated, female body of prickly appearance, female P2–P4 enp2 proximal inner seta lost. Intraspecific variability involves spinulation, ornamentation and size of the body and setation and spinulation of pereiopods. Sexually dimorphic modifications of adult females include prickly appearance of the body, P1 enp exceeds exp in length, P1 coxa externally broadened, seta of basis arising from prominent protrusion, hyaline frills of body somites ornate. Sexual dimorphism in adult males is expressed in smaller body size, haplocer A1, 2 inner setae on P2–P4 enp2 and on P5 exp, P5 basendopodal lobe with 2 setae. Some modifications allow sexing of copepodid stages. The female A1 is fully developed in CV, the male A1 undergoes extensive modifications at the last molt. P1–P4 are fully developed in CV. Mesocletodes faroerensis and Mesocletodes thielei lack apomorphies of Mesocletodes and are excluded.
UEBER DAS SPEIVTRUM SEISMISCHER WELLEN, DIE DURCH SPRENGUNGEN ERZEUGT WERDEN
h. menzel
Annals of Geophysics , 1951, DOI: 10.4401/ag-5916
Abstract: Es werden eiiiige Interferenzejfekte diskutiert, ivelche in einemideal elastischen Medium das Spektrum sprengseimischer IT eli e ri ver-(inderà. Der Einfluss der sog. Verivitterungszone scheint am bedeutendstenzu sein.
Uber seismische Wellen in nnelastischcni Material
H. MENZEL
Annals of Geophysics , 1977, DOI: 10.4401/ag-4824
Abstract: SUMMARY - The propagation of seismic waves in inelastic media is investigated. The relation between stress and strain tensor is of the form 7 OV; + Ptj = U' Ekk Sij + z V + A £kk Sii + z (" Eii Tehe velocity of propagation and the extinction both of compressional and shear-waves are calculated. The exitation of the waves is assumed to be purely harmonic and acting at a line of the surface.
SULLO SPETTRO DELLE ONDE SISMICHE DESTATE DA ESPLOSIONI (*)
h. menzel
Annals of Geophysics , 1951, DOI: 10.4401/ag-5924
Abstract: Viene discusso l'effetto d'interferenza, che provoca la variazione dello spettrodelle onde sismiche generate da esplosioni in un mezzo elastico ideale.L'influsso della così detta Verivitterungszone (zona in cui originano leonde per urto) sembra essere predominante.
Introduction to the Research Topic on Standard Brain Atlases
Randolf Menzel
Frontiers in Systems Neuroscience , 2012, DOI: 10.3389/fnsys.2012.00024
Abstract:
Ultramicroscopy – Imaging a Whole Animal or a Whole Brain with Micron Resolution
Randolf Menzel
Frontiers in Neuroscience , 2011, DOI: 10.3389/fnins.2011.00011
Abstract:
Parsing of Spoken Language under Time Constraints
Wolfgang Menzel
Computer Science , 1994,
Abstract: Spoken language applications in natural dialogue settings place serious requirements on the choice of processing architecture. Especially under adverse phonetic and acoustic conditions parsing procedures have to be developed which do not only analyse the incoming speech in a time-synchroneous and incremental manner, but which are able to schedule their resources according to the varying conditions of the recognition process. Depending on the actual degree of local ambiguity the parser has to select among the available constraints in order to narrow down the search space with as little effort as possible. A parsing approach based on constraint satisfaction techniques is discussed. It provides important characteristics of the desired real-time behaviour and attempts to mimic some of the attention focussing capabilities of the human speech comprehension mechanism.
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