4,199 research outputs found
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
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
Introductory Digital Design - A Programmable Approach
No full textThis book adopts an integrated approach to hardware and software for logic-circuit design. It has been developed from the author's experience in lecturing to first-year undergraduate students of electronics and software engineering. Modern programming logic is used and the author describes how the basic programmable devices work, as well as how to write the software to make them work. The book starts off with the basics of combinatorial design: how to specify logic circuits, how to minimise them and how to implement them. Sequential logic design is presented using the algorithmic state machine (ASM) approach with reference to Moore and Mealy design. These are implemented in programmable logic, using a software specification to drive established programmable array logic (PAL) architectures; the software uses the popular PALASM and PLPL specification languages with worked design examples programming standard PAL chips. Later chapters also cover arithmetic circuits and their implementation, data conversion which is used to interface digital circuits to the outside world, and practical aspects of building digital circuits. Solutions are provided for the end of chapter questions. Sections 1. Introduction 1.1 Introducing digital electronics 1.2 Organisation of this book 1.3 Preliminaries 2. Combinational logic design 2.1 Combinational logic/Boolean algebra 2.2 Logic functions 2.3 Combinational logic and computer software 2.4 Combinational logic implementation 2.5 Integrated Circuits 2.6 Basic logic Devices 2.7 Introductory combinatorial design 2.8 Laws of logic 2.9 Minimisation 2.10 Timing considerations and static hazards 2.11 Logic implementations 2.12 Terminology 2.13 Concluding comments and further reading 2.14 Questions 3. Logic circuits 3.1 Device characteristics 3.2 Switching devices 3.3 Logic technologies 3.4 Comparison of logic circuits 3.5 Specimen CMOS and ECL datasheets 3.6 Concluding comments and further reading 3.7 Questions 4. Introductory sequential logic 4.1 Sequential logic concepts 4.2 Bistables 4.3 Clocks and synchronism 4.4 Master-slave D-type bistable 4.5 Positive edge-triggered D-type 4.6 Timing considerations 4.7 Asynchronous inputs 4.8 Sequential systems 4.9 Algorithmic state machine design 4.10 Further ASM chart design 4.11 Asynchronous vs. synchronous design 4.12 Concluding comments and further reading 4.13 Questions 5. Programmable logic implementation 5.1 Programmable logic design 5.2 Programmable circuits 5.3 The PALCE16V8 PAL and the PALASM language 5.4 Introductory programmable design example 5.5 Programmable sequential logic examples 5.6 Design examples 5.7 Concluding comments and further reading 5.8 Questions 6. Number systems, coding and arithmetic 6.1 Numbers and coding systems 6.2 Binary arithmetic 6.3 Design examples 6.4 Concluding comments and further reading 6.5 Questions 7. Analog-to-digital and digital-to-analog conversion 7.1 Analog-to-digital and digital-to-analog basics 7.2 A/D and D/A performance characteristics 7.3 Amplifiers and operational amplifiers 7.4 D/A conversion circuits 7.5 A/D conversion circuits 7.6 Concluding comments and further reading 7.7 Questions 8. Interface and hybrid circuits 8.1 Schmitt trigger 8.2 Power supplies and decoupling 8.3 Output stages 8.4 Driving circuits 8.5 Clock circuits 8.6 Monostables 8.7 Timer chips 8.8 Concluding comments and further reading References. Appendix 1. Drawing logic circuits A1.1 Mixed-logic convention A1.2 IEEE/ANSI logic symbol standard Appendix 2. The PLPL programming language and the PEEL18CV8 A2.1 The PEEL 18CV8 PAL A2.2 The PLPL programming language A3.3 Examples in PLPL and PEEL 18CV8 Appendix 3. Semiconductor manufacturers - contact addresses Appendix 4. Further reading Appendix 5. Abbreviated answers to questionsContent
Estimation of Glycogen Content of Nematodes from Ovis Bharal, Aurangabad Region (M.S.), India
No full textIn the present work, focus has been given to understand the mode of carbohydrate metabolism in parasites. The study of glycogen levels furnish the basic information about substrates and their intermediatory metabolites by which it is possible to get fair idea of metabolic pathway in which energy is derived by the nematode parasites. Department of Zoology, Dr.B.A.M.University Aurangabad (M.S.) India* Corresponding Author, Email: Â [email protected] Cite This Article As: Tushar Dhondge, Sujeet Jamdar and Baba Jadhav. 2010. Estimation of Glycogen Content of Nematodes from Ovis Bharal, Aurangabad Region (M.S.), India. J. Exp. Sci. 1(2): 18-19
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