4,466 research outputs found
Technologies and policies for the integration of financial services industry across the European communities
No full textThesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1991.Includes bibliographical references (leaves 341-347).by Usman A. Ghani.M.S
On using Directional Information for Parameter Space Decomposition in Ellipse Detection
No full textIn this paper we use the parametric polar representation to extend the application of edge directional information from circle to ellipse extraction. As a result we obtain a mapping which decomposes the parameter space required for ellipse extraction into two independent sub-spaces and one final histogram accumulator. The mapping includes the tangent of the angle of the first and second directional derivatives. These tangents are computed by considering edge direction at two border points. We show that the use of gradient information for parameter space decomposition avoids the intensive point labelling imposed by geometric constraints used by other approaches
Large-scale patterns in turbulent Rayleigh-Bénard convection in very large aspect ratio cells
No full textLarge-scale patterns, which are well-known from the spiral defect chaos regime of thermal convection at Rayleigh numbers Ra 105. They are uncovered when the turbulent fields are averaged in time and turbulent fluctuations are thus removed. We apply the Boussinesq closure to calculate turbulent viscosities and diffusivities, respectively. The resulting turbulent Rayleigh number Ra_, that describes the convection of the mean patterns, is indeed in the spiral defect chaos range. Interestingly, the turbulent Prandtl numbers are smaller than one with 0:2 _ Pr_ _ 0:4 for Prandtl numbers 0:7 _ Pr _ 10. Finally, we demonstrate that these mean flow patterns are robust to an additional finite-amplitude side wall-forcing when the level of turbulent fluctuations in the flow is sufficiently high
Reynolds number effect on 3D turbulent offset jet reattaching to a free surface
No full textExperimental study was carried out to investigate the effect of Reynolds number on 3D offset jet reattaching to above free surface. Sharp edged square nozzle was used to produce the jets, and the measurements were performed at the following six different Reynolds numbers: 2300, 3700, 5100, 7900, 10300 and 11900. Detailed velocity measurements were made in the symmetry plane. From the PIV data, the mean velocity and turbulence statistics were obtained to study the effects of Reynolds number on the salient features of the jet flow. Preliminary results on streamwise mean velocity decay along the nozzle centerline, contours of streamwise mean velocity and Reynolds shear stress are presented herein
The Benefits of Being Economics Professor A (and not Z)
No full textAlphabetic name ordering on multi-authored academic papers, which is the convention in the economics discipline and various other disciplines, is to the advantage of people whose last name initials are placed early in the alphabet. As it turns out, Professor A, who has been a first author more often than Professor Z, will have published more articles and experienced afaster growth rate over the course of her career as a result of reputation and visibility. Moreover, authors know that name ordering matters and indeed take ordering seriously: Several characteristics of an author group composition determine the decision to deviate from the default alphabetic name order to a significant extent.performance measurement, incentives, economists, name ordering
<i>Entrenchment, wealth, power, and the constitution of democratic societies</i> by Paul Starr
No full textEntrenchment, Wealth, Power, and the Constitution of Democratic Societies, by Paul Starr, New Haven, CT: Yale University Press. 2019. 280 pages, hardcover.Why should we, as Management scholars and educators, care about a book on political diagnosis? The answer is twofold. First, the calibre of the author (Paul Starr), an awardee of both Bancroft and Pulitzer Prizes, a former policy advisor to the Clinton administration, and the author of The Transformation of American Medicine (1982), a book with a profound impact on American policy circles. Second, the core concept (entrenchment) of the book, and its potential to advance the process of institutional development, and the ways in which we can reform and change our institutions to better meet the current and pressing needs of the many, rather than preserve the unequal privileges of a few. In light of the geopolitical, social, and environmental pressures we see currently rising across the world (George, Howard-Grenville, Joshi & Tihanyi, 2016; Howard-Grenville, Buckle, Hoskins & George, 2014) there is no better time to examine whether and how we can address some of these grand challenges by reforming and improving our institutions
M.S. Kutorga and V.M. Vedrov: Conflict of Teacher and Student
No full textВ статье рассматривается конфликт между М.С. Куторгой и его учеником В.М. Ведровым. Исследуются причины конфликта, а также то влияние, которое он оказал на дальнейшую научную карьеру ученика. This article discusses the conflict between M.S. Kutorga and his student V.M. Vedrov. The author investigates the causes of the conflict and its impact on academic career V.M. Vedrov
Ultra-fast escape of a deformable jet-propelled body
No full textIn this work a cephalopod-like deformable body that fills an internal cavity with fluid and expels it to propel an escape manoeuvre, while undergoing a drastic external shape change through shrinking, is shown to employ viscous as well as mainly inviscid hydrodynamic mechanisms to power an impressively fast start. First, we show that recovery of added-mass energy enables a shrinking rocket in a dense inviscid flow to achieve greater escape speed than an identical rocket in a vacuum. Next, we extend the shrinking body results of Weymouth & Triantafyllou (J. Fluid Mech., vol. 702, 2012, pp. 470–487) to three-dimensional bodies and show that three hydrodynamic mechanisms must be combined to achieve rapid escape performance in a viscous fluid: added-mass energy recovery; flow separation elimination; and an optimized energy storage and recovery. In particular, we show that the mechanism of separation elimination achieved through rapid body shrinking, coordinated with the mechanism of recovering the initially imparted added-mass energy, is critical to achieving a high escape speed. Hence a flexible, collapsing body can be vastly superior to a rigid-shell jet-propelled body
Oxneriaria pakistanica M. S Iqbal, Usman, K. Habib, Khalid 2023, sp. nov.
No full textOxneriaria pakistanica M.S Iqbal, Usman, K. Habib, Khalid sp. nov. MYCOBANK MB 845095 Etymology: The epithet ‘ pakistanica ’ refers to the type locality of the country Pakistan. Diagnosis: Oxneriaria pakistanica is differs from its closely related species Oxneriaria rivulicola by having nonzonate, distinctly areolate, grey to whitish grey upper surface, and prothallus absent, immersed apothecia (1–1.5mm), broadly ellipsoid to sub-spherical ascospores (10–18 × 7–10 µm). Holotype:— PAKISTAN: Gilgit Baltistan, Darel Valley 35° 37’N, 73° 27’E, elev. 1,900 m, on rocks, 21 October 2020, Muhammad Shahid Iqbal DR-42 (LAH37495), (ITS GenBank accession number OP114649). Description: Thallus: crustose, non zonate, inially placodoid (lobate), becoming non placodoid with age, 5 cm across. Areoles: distinctly areolate, uncracked, 0.5–1.8 mm wide, minute at ages, broadly attached, discrete to rarely contiguous, thinly wrinkled, irregular or angular to irregular elongated, flat to strongly convex. Upper surface: epruinose, dull, whitish grey to grayish, unchanged when wet. Prothallus: not found. Upper Cortex: paraplectenchymatous, two-layered, above brown, below hyaline, 10–25 µm thick, cells 5–10 µm in diam. Algal layer: discontinuous, 30–50 µm thick, photobiont chlorococcoid, cells ± spherical, 10–15 µm in diam. Medulla:, hyphae prosoplectenchymatous, 3–5 µm wide. Apothecia: frequent, aspiciloid, immersed, covering whole areole, 1–3 per areole, mostly one per areole, become confluent many, rounded to angular, 0.5–2 mm in diam. Disc: 0.5–2 mm in diam, black, dull, plane to weakly concave, irregular to elongated, often with depressions, epruinose. Margins: concolorous to thallus, elevated, thick, continuous, thinly wrinkled. Thalline exciple: 90–120 µm wide. Proper exciple: indistinct. Epihymenium: brown to dark brownish, 20–30 µm thick. Hymenium: hyaline, 100–155 µm tall. Hypothecium: hyaline, 90–170 µm deep. Paraphyses: moniliform, septate, 2–4 celled capitate, cell 3.5–5.5 µm wide elevated. Asci: clavate, 8-spored, 60–80 × 30–40 µm. Ascospores: simple, hyaline, broadly ellipsoid to sub-spherical, 10–18 × 7–10 µm. Chemistry: Cortex K+ (yellowish green), C-, KC + (light green) Medulla: all negative TLC: Unknown substance detected Habit and Habitat: The recognized collections of new species are from a moist temperate climate, in an open situation exposed to sun and rain, found at the hilly topography of Darel valley with an altitude of 3.843m. In area, summers are warm and clear and the winters are freezing, snowy, and partly cloudy. The specimens were on calcareous sedimentary rocks. Common floral species are trees and shrubs. Pinus gerardiana, Cedrus deodara, Pinus wallichiana, Fraxinus xanthoxyloides. The average annual precipitation in the valley is 100–300 mm, mostly occurring during winter and early spring in the form of snow. Mean temperatures range from -10 °C in winter to +35 °C in summer. Additional Specimen:— PAKISTAN: Gilgit Baltistan, Darel Valley 36° 38’N, 74° 28’E, elev. 2,000 m, on rocks, 10 August 2022, Muhammad Shahid Iqbal DR-106 (LAH 37501), (ITS GenBank accession number OP627196). Comments Morphologically, Oxneriaria pakistanica can be distinguished from the superficially similar taxon Oxneriaria verruculosa in having 0.5–1.8 mm wide areoles (vs 0.5–1mm wide), distinctly areolate (vs often elongate, giving thallus subplacodoid appearance), epruinose (vs. grey pruinose), prothallus absent (vs. sometimes delimited by black prothallus), 0.5–2 mm in diam apothecia (vs. 0.2–0.5 mm), taller hymenium 100–155 µm (vs. 70–80), deeper hypothecium 90–170 µm (vs 20–30 µm), larger ascospores 10–18×7–10 µm (vs 12–17×7.5–9 µm), chemistry unknown substance detected (vs stictic acid, rarely norstictic acid) (Nimis 2016). Phylogenetically, Oxneriaria rivulicola is close to the Pakistani taxon but can be easil differentiated as the former has zonate thallus, usually lacks distinct aeroles but with radiating cracks, often with a brownish ting and prothallus usually present, apothecia up to 2 mm, chemistry: no substance detected. Nordin et al., (2011). The Pakistani taxon is non - zonate, distinctly areolate, grey to whitish grey upper surface, and prothallus absent, apothecia 0.5–2 mm, chemistry: unknown substance detected. Another morphological similar taxon to Oxneriaria pakistanica is Oxneriaria dendroplaca, which has also distinctly - areolate thallus but has black Prothallus, elongated marginal areoles, smaller apothecia ( upto 0.6 mm ), and brown to dark greenish grey thallus, size of ascospores 13.6–[15.7]–19.2×7.9–[8.9]–11.9, whereas the Oxneriaria pakistanica has none elongated marginal areoles, prothallus absent, larger apothecia 1–2 mm and whitish gray to gray thallus, larger ascospores 10–18×7–10 µm.Nordin et al., (2011). The ITS nrDNA also support the separation of Oxneriaria pakistanica in phylogenetically. The sequence of Oxneriaria nikrapensis is not available in Genbank. Oxneriaria nikrapensis whitish mealy thallus, larger ascospores 20–24 × 15–20 µm and stictic acid detected by TLC. Chesnokov et al., (2018).Published as part of Iqbal, Muhammad Shahid, Usman, Muhammad, Habib, Kamran & Khalid, Abdul Nasir, 2023, Oxneriaria pakistanica sp. nov. (Megasporaceae, Pertusariales, Ascomycota) from Darel Valley, Gilgit Baltistan, Pakistan, pp. 125-131 in Phytotaxa 579 (2) on pages 128-130, DOI: 10.11646/phytotaxa.579.2.6, http://zenodo.org/record/754314
AIEDAM thematic collection: a perspective on data-enabled design – design meet data science
No full textGreen 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.Internet of ThingsDesign, Organisation and Strateg
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