112,147 research outputs found
Centromerus mariannae Slowik 2018, new species
No full text<i>Centromerus mariannae</i> Slowik, new species <p>Fig. 8–11.</p> <p> <i>Centromerus</i> sp. (van Helsdingen 1973)</p> <p> <i>Centromerus</i> sp. #1 (Crawford 1988)</p> <p>urn:lsid:zoobank.org:act: 6279732C-C947-490A-8854-15A7875C53E8</p> <p> <b>Types.</b> <i>Holotype Male</i>: USA. Alaska. Prince of Wales Island, Staney Creek, 55.79726°N, 133.1363°W, 50 m elv., 14–30 May 2010, coll: J. Stockbridge, C. Bickford, thinned 2nd growth, pitfall 3, UAM: Ento:225490.</p> <p> <b>Paratypes measured.</b> USA. <b>Alaska.</b> 1 female, Prince of Wales Island, Hatchery Ck. 2, 55.89356°N, 132.9437°W, 134 m elv., 28 May 2010, coll: J. Stockbridge, C. Bickford, unthinned 2nd growth, Berlese, UAM: Ento:225476; 1 female, Prince of Wales Island, Hatchery Ck. 4, 55.88285°N, 132.89795°W, 82 m elv., 14 May–30 May 2010, coll: J. Stockbridge, C. Bickford, unthinned 2nd growth, pitfall 3, UAM: Ento:225483; 1 female, Prince of Wales Island, Coffman Cv, 55.98053°N, 132.8607°W, 78 m elv., 28 May–10 June 2010, J. Stockbridge, C. Bickford, unthinned 2nd growth, pitfall 3, UAM: Ento:225493; 1 female, Prince of Wales Island, Coffman Cv, 55.9795°N, 132.86256°W, 67 m elv., 38864, J. Stockbridge, C. Bickford, thinned 2nd growth, Berlese, UAM: Ento:225486; 1 female, Prince of Wales Island, Coffman Cv, 55.98053°N, 132.8607°W, 78 m elv., 10–30 June 2010, J. Stockbridge, C. Bickford, unthinned 2nd growth, pitfall 2, UAM: Ento:225499; 1 male, Prince of Wales Island, Staney Ck., 55.79726°N, 133.1363°W, 50 m elv., 27 April–15 May 2010, Jill Stockbridge, thinned 2nd growth, pitfall 4, UAM: Ento:225466; 1 male, Prince of Wales Island, Hatchery Ck. 4, 55.88433°N, 132.89734°W, 82 m elv., 27 April–15 May 2010, Jill Stockbridge, thinned 2nd growth, pitfall 4, UAM: Ento:225467; 1 male, Prince of Wales Island, Luck Point, 55.98261°N, 132.77986°W, 205 m elv., 18 May–2 June 2010, J. Stockbridge, C. Bickford, thinned 2nd growth, pitfall 2, UAM: Ento:238876; 1 male, Prince of Wales Island, Staney Ck., 55.87126°N, 133.06697°W, 72 m elv., 11 May–22 May 2010, J. Stockbridge, C. Bickford, clearcut/ecotone, pitfall 4, UAM: Ento:225474; 1 male, Prince of Wales Island, Staney Ck., 55.79901°N, 133.11782°W, 41 m elv., 27 June-14 July 2010, J. Stockbridge, C. Bickford, old growth, pitfall 2, UAM: Ento:225500; 2 females, Prince of Wales Island, Staney Creek, 55.79723°N, 133.13467°W, 63 m elv., 10 June 2010, coll: J. Stockbridge, C. Bickford, 2nd growth, Berlese, UAM: Ento:225494; 1 male, Prince of Wales Island, Staney Ck., 55.79726°N, 133.1363°W, 50 m elv., 14–30 May 2010, Jill Stockbridge, C. Bickford, thinned 2nd growth, pitfall 2 UAM: Ento:225489 (DNA Barcoded, bin = BOLD: AAU6230).</p> <p> <b>Specimen notes.</b> Holotype deposited at UAM. Two pairs of paratypes deposited each at UWBM and the Royal British Columbia Museum. All other paratypes deposited at UAM. An additional 493 specimens were examined and are located at UAM. http://arctos.database.museum/saved/Centromerusnsp.</p> <p> <b>Etymology.</b> The specific epithet refers to the late Marianne E. Parker (Hippisley) Clark who collected beetles in the Terrace area of British Columbia. She sent her spiders to J. H. Emerton in the early part of the 20th century and is responsible for the specimen originally illustrated and mentioned by van Helsdingen (1973). A historical character in the area, she originally was interested in minerals and bryophytes until she lost her right arm in a gun accident in 1911 and focused instead on beetles.</p> <p> <b>Diagnosis.</b> Male <i>C. mariannae</i> can be separated from all other <i>Centromerus</i> species in the Pacific Northwest by the small size (1.86–1.94 mm), the presence of a row of denticles along the medial ridge of the paracymbium (Fig. 8), and a single thorn-like spur at the base of the radix and the lamella characteristica (Fig. 9). It may be separated from <i>C. longibulbus</i> (Emerton), which may be encountered along the Eastern edge of the species distribution, which has a single large point on the medial ridge of the paracymbium, and a different shaped radix with a broad projection at the base of the radix and lamella (van Helsdingen 1972, figure 20). It may be separated from <i>C. sylvaticus</i> (Blackwall), a Holarctic species, which is much larger, 2.5–3 mm total length, and has a different radix shape, with a curved anterior portion and a long extended basal fork which curves around towards the paracymbium (van Helsdingen 1973, Figure 29).</p> <p> Females can be separated from close relatives by the shape of the scape, which is longer than wide with two pair of equally sized lateral lobes (Fig. 11). In <i>C. longibulbus</i> the scape has a single set of lateral lobes (van Helsdingen 1973, Figure 21), and in <i>C. sylvaticus</i> the scape is wrinkled with no lateral lobes (van Helsdingen 1973, Figure 31).</p> <p> <b>Description.</b> <i>Holotype male</i>. Total length = 1.90 mm; carapace length = 1.0 mm; carapace width = 0.82 mm; L×W ratio 1.21. TmI = 0.51, TmIV absent. Chaetotaxy: FI, 1-1-0-0; FII-IV, 0-0-0-0; PtI-V, 1-0-0-0; TiI-IV, 1-0-0-0; MtI-V, 0-0-0-0. Carapace uniform yellow in color. ALE, PME, PLE similarly sized, AME 2/3 the size of the other eyes, 1/2 eye width apart. Lateral eyes adjacent, PME separated from lateral eyes by almost an eye width. PME 3/4 eye width apart. Clypeus three ALE width. Sternum yellow. Abdomen uniform grey. Legs yellow and unmarked. Three cheliceral promarginal teeth. Cymbium with a basal spur and a bump where the paracymbium sits. Paracymbium robust with a line of small triangular points or denticles running along the medial ridge (Fig. 8). Proximal end wide with a broad distal curve end. Radix with a single thorn shaped spur at the base pointing ventrally. Embolus and lamella characteristica originating from the base of the radix near the basal spur. Embolus proper with a twist about mid-length and two points. Lamella characteristica sickle shaped, broadest in the middle with the distal end transparent (Fig.9). Median apophysis dark pointed sharply towards the lamella characteristica. Median membrane broad and transparent. Sclerite of the median membrane bifurcate.</p> <p> <i>Female</i> (<i>n</i> = 5). Total length = 1.72 mm; carapace length = 0.82 mm; carapace width = 0.67 mm; L×W ratio 1.21. TmI = 0.46, TmIV absent. Chaetotaxy: FI, 0-1-0-0; FII-IV, 0-0-0-0; PtI-V, 1-0-0-0; TiI-IV, 2-0-0-0; MtI-V, 0-0-0-0. Coloration same as male only the abdomen tends to be slightly lighter in color. Scape bulbus with two basal and two distal lateral lobes (Fig. 11). Scape tip long as the lateral lobes are wide with a prominent scape hook. Spermatheca clearly visible, globular, located near the two basal lobes of the scape, protruding out on the dorsal surface of the epigynum (Fig. 10).</p> <p> <b>Variation.</b> <i>Male</i> (<i>n</i> = 5). Total length = 1.86–1.94 mm; carapace length = 0.92–1.02 mm; carapace width</p> <p> = 0.81–0.83 mm. <i>Female</i> (<i>n</i> = 5). Total length = 1.66–1.88 mm; carapace length = 0.79–0.85 mm; carapace width = 0.65–0.69 mm. There is some amount of variation in the size of the basal spur of the cymbium, being much more prominent in some specimens. The number of denticles on the paracymbium is also variable usually from 6–11. The amount the lateral lobes protrude laterally on the scape also shows variation, with the proximal pair sometimes not extending as far laterally as the distal pair.</p> <p> <b>DNA barcoding.</b> One paratype from UAM (UAM:Ento:225489) was DNA barcoded by Sikes et al. (2017) and falls into BIN BOLD:AAU6230 with 8 other specimens, which is 6.48% distant from its nearest neighbor and shows a maximum within-BIN distance of 1.08%.</p> <p> <b>Distribution.</b> The species is a common forest floor dweller which has been collected from the Pacific coast inland to the coastal mountains of Washington, up through British Columbia, and into southeastern Alaska. In British Columbia specimens have been collected inland as far as the Rockies. Specimens are collected in pitfall traps and from sifting litter or moss. Mature specimens are usually collected May- June with some additional adults being picked up as late as October in British Columbia.</p> <p> <b>Discussion.</b> This species was originally illustrated and mentioned by van Helsdingen (1973) of a poorly preserved and damaged male sent to Emerton and found in the MCZ. At the time he realized the novelty of the species, but with only the damaged sample left it to be described at a later time when more samples in better condition could be obtained.</p> <p> The genus <i>Centromerus</i> shows morphological variation among the species currently included in the genus. This species was included in the <i>cornupalpis</i> -group by van Helsdingen (1973) which includes <i>C. longibulbus</i> which is the nearest congener based on morphology, but it can be identified from the species by the characters mentioned previously. The species is the only member of the West Nearctic Pattern described in Eskov and Marusik (1992). Of the other two Pacific Northwest representatives of the genus, <i>C. longibulbus</i> (Emerton, 1882) and the holarctic <i>C. sylvaticus</i> (Blackwall 1841), this is by far the most commonly collected species of <i>Centromerus</i>.</p>Published as part of <i>Slowik, Jozef, 2018, Tenuiphantes zelatus (Zorsch), T. zibus (Zorsch), and Centromerus mariannae sp. nov. (Araneae: Linyphiidae) in the Pacific Northwest, pp. 1-9 in Insecta Mundi 649</i> on pages 5-7, DOI: <a href="http://zenodo.org/record/3708248">10.5281/zenodo.3708248</a>
Fracture of concrete under variable amplitude fatigue loading
No full textThe fracture response of concrete under low-cycle variable amplitude loading at frequencies up to 10 Hz was investigated. The applied loading history, selected to reflect earthquake loads on concrete dams, consisted of a basic sinusoidal oscillation interrupted by occasional spikes. Test results of specimens with different sizes and loading histories are reported. It was determined that the induced damage is both size and loading history-dependent; further, it was found that spikes in the loading history are likely to accelerate crack growth. On the basis of the experimental results, a fracture mechanics-based empirical law for crack propagation under variable amplitude cyclic loading is proposed
Piezoresistive properties of cementitious composites reinforced by PVA fibres
No full textThe use of fibres to enhance the ductility of cementitious composites has been extensively studied for the past few years. The addition of polymeric or metalic fibres with random orientation to the composite or even natural long and aligned fibres demonstrated a very successful reinforcement capable to reach a high mechanical performance. Other property that has been studied is the use of those composites to work as strain sensors. To develop piezoresistive properties on cementitious composite, the addition of conductive materials is necessary. This research evaluated the incorporation of different volumes of multi-wall carbon nanotubes on the piezoresistive properties of strain hardening cementitious composites (SHCC) reinforced by PVA fibres. Through impedance measurements the opening of the cracks under tensile loading was studied. The characterization of this material can help on the understanding of self-sensing properties, adding value to the SHCC used by the repair industry and will contribute to the continuous infrastructure monitoring.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Materials and Environmen
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Light interaction with extended quantum systems in dispersive media
No full textWe derive a light–matter interaction Hamiltonian to describe a quantum system embedded in a dispersive environment and coupled with the electromagnetic field. We include in this theory the spatial extension of the system, taken into account through its wavefunction. This enables us to overcome the divergence problem of the Green tensor propagator that arises from a point-like approximation of the quantum system. Thus the formalism can be applied to generalize the expressions for the spontaneous emission rate and the Lamb shift for a quantum system defined by a spatially extended dipole. In particular, these quantities can be modified by the asymmetry of the spatial structure of the atomic system as demonstrated in two test-bed examples
Beyond the Rabi model: Light interactions with polar atomic systems in a cavity
No full textThe Rabi Hamiltonian, describing the interaction between a two-level atomic system and a single-cavity mode of the electromagnetic field, is one of the fundamental models in quantum optics. The model becomes exactly solvable by considering an atom without permanent dipole moments, whose excitation energy is quasiresonant with the cavity photon energy, and by neglecting the nonresonant (counter-rotating) terms. In this case, after including the decay of either the atom or the cavity mode to a continuum, one can derive the well-known phenomenology of quasiresonant transitions, including the fluorescence triplets. In this work we consider the most general Rabi model, incorporating the effects of permanent atomic electric dipole moments. Based on a perturbative analysis, we compare the intensities of emission lines induced by rotating terms, counter-rotating terms, and parity-symmetry-breaking terms in order to identify the parameter regimes in which these different contributions play a significant role. The analysis reveals that the emission strength related to the existence of permanent dipoles may surpass the one due to the counter-rotating interaction terms but is usually much weaker than the emission due to the main, resonant coupling. This ratio can be modified in systems with a reduced dimensionality or by engineering the energy spectral density of the continuum
Light interaction with extended quantum systems in dispersive media
No full textWe derive a light–matter interaction Hamiltonian to describe a quantum system embedded in a dispersive environment and coupled with the electromagnetic field. We include in this theory the spatial extension of the system, taken into account through its wavefunction. This enables us to overcome the divergence problem of the Green tensor propagator that arises from a point-like approximation of the quantum system. Thus the formalism can be applied to generalize the expressions for the spontaneous emission rate and the Lamb shift for a quantum system defined by a spatially extended dipole. In particular, these quantities can be modified by the asymmetry of the spatial structure of the atomic system as demonstrated in two test-bed examples
Využití sociálních médií v B2B prodeji
No full textTato diplomová práce se zabývá tím, jak mohou B2B obchodníci využívat sociální média v prodeji. Na základě systematické rešerše literatury, autor zjistil, že akademici, zkoumající danou problematiku, navrhují další výzkum, a to: v kterých konkrétních krocích se dají využít sociální média v prodeji (Salo, 2017). Autor se na základě toho rozhodl zjistit, jaké sociální sítě, různé technologie a pluginy se dají využít v B2B prodeji - tzv. social sellingu. Social selling se v této práci týká primárně procesu akvizice a okrajově péčí o stávající zákazníky. Autor si vybral kvalitativní průzkum pomocí 10 hloubkových polo-strukturovaných rozhovorů, aby odhalil jak, která sociální média to jsou, tak i motivaci prodejců, proč tato média používat/nepoužívat. Aby autor dodržel správnost vyhodnocení výsledků, data byla analyzována pomocí Tématické analýzy, která v této studii vykrystalizovala 2 hlavní strategické přístupy v social sellingu. Tyto přístupy (tzv. Push a Pull strategie) obsahují praktické příklady a konkrétní aktivity, které mohou prodejci využívat v každodenní praxi. Tyto výsledky jsou prezentovány s důrazem na praktičnost a jednoduchost implementace. Tvoří proto hlavní přínos autorovo výzkumu. V poslední části autor zmiňuje výzvy a manažerská doporučení, které mohou obchodníci využít v každodenním pracovním životě.This diploma thesis focuses on social media usage in B2B sales. Based on the systematic literature review conducted by the author, he has found out that recent researchers (Salo, 2017) suggest further research in the area of how and in which sales phase should various social networking sites, technologies and plugins used. To further fill this research gap, author decided to identify these social media and their usage among B2B salespeople in the so-called social selling process. The social selling process in this thesis applies mainly to acquiring new prospects and tangentially to taking care of existing clients (follow-up step). Author has chosen a qualitative research method via conducting 10 in-depth semi-structured interviews to reveal these instruments as well as motivation of a sales person on why to use social media in the selling process. The collected data was analyzed using Thematic analysis to ensure the right procedure and to identify main themes which crystalized into 2 main strategic approaches in social selling. These approaches (Push and Pull) include practical examples of concrete activities which sales people can use in their daily jobs and are presented with focus on practicality and ease of implementation. These also form the main contribution of author`s research. In the last part, author mentions challenges in social selling and recommended managerial implications for salesforce
- …
