Preface     

MacLeod  Roy 《Minerva》2007,45(1):1-2

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Writing for children: A social engagement?     

Gillian Avery  Alec Lea  Joan G Robinson  Roy Brown 《Children‘s Literature in Education》1971,2(3):17-30

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Tests of caustic magnesia made from magnesite from several sources     

P.H. Bates  Roy N. Young  Paul Rapp 《Journal of The Franklin Institute》1923,196(5):681-683

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A passion for portraits: Elizabeth Cay's pastels     

Thea Burns  Ashok Roy 《文物保护研究》2014,59(5):279-288

Elizabeth Cay (1771–1831), the grandmother of the Scottish physicist James Clerk Maxwell (1831–1879), was a talented amateur pastellist; several of her pastel portraits survive as does her set of pastels. She studied with Archibald Skirving (1749–1819), a Scottish miniature painter who later in life turned to larger-scale portraiture in pastel and served as drawing master to the Edinburgh elite. Cay's pastels are not fabricated sticks but consist of powdered pigment housed in various glass and ceramic containers and were apparently applied by stumps, still in her workbox, or brushes. The Cay color samples were identified by spectrographic analysis, polarized light microscopy, and microchemical tests which, in addition, indicated that a number of pigment mixtures present gave specific hues in keeping with earlier treatise accounts of the preparation of a pastel gamut for practical use. Elizabeth Cay's pastel workbox may be rare surviving evidence of one way, more common that we appreciate today, in which amateurs, and perhaps professionals, practiced pastel painting.  相似文献   

Projectile motion with quadratic damping in a constant gravitational field     

Chandra Das  Dhiranjan Roy 《Resonance》2014,19(5):446-465

The motion of a projectile in a constant gravitational field is an age-old problem. If there is no resistive force, the problem is simple. However, with the intoduction of resistive forces, the complexity of the problem increases. Recently, there has been a growing interest in the problem of projectile motion under a resistive force proportional to the square of velocity. The problem for resistive force proportional to vv cannot be solved in closed analytical form. A series solution of the equation leads to divergent series for x (t) and y (t) for reasonable values of the initial speed and angle of projection. However, we demonstrate that by inverting the series for x (t), i.e., expressing t in terms of x, and substituting this in y (t) one can express y in terms of x which is a highly convergent series and one can obtain the path of projectile with a few terms of the series. We further demonstrate that one can obtain the path even with a few terms of the divergent series for x (t) and y (t) by using extrapolation methods.  相似文献   

Enrico Fermi — The complete physicist     

Amit Roy 《Resonance》2014,19(8):684-703

Enrico Fermi was a versatile physicist contributing in equal measure to theory and experiments. He is credited to be the ‘Father of the Atomic Age’ following his successful demonstration of sustained chain reaction in Chicago Pile-1. In this article, I have discussed his major experimental contributions that clearly demonstrate his simplicity of conception, meticulous attention to detail and directness of approach to the problem at hand.  相似文献   

Iterated gain-based stochastic filters for dynamic system identification     

Tara Raveendran  Debasish Roy  Ram Mohan Vasu 《Journal of The Franklin Institute》2014

We propose a novel form of nonlinear stochastic filtering based on an iterative evaluation of a Kalman-like gain matrix computed within a Monte Carlo scheme as suggested by the form of the parent equation of nonlinear filtering (Kushner–Stratonovich equation) and retains the simplicity of implementation of an ensemble Kalman filter (EnKF). The numerical results, presently obtained via EnKF-like simulations with or without a reduced-rank unscented transformation, clearly indicate remarkably superior filter convergence and accuracy vis-à-vis most available filtering schemes and eminent applicability of the methods to higher dimensional dynamic system identification problems of engineering interest.  相似文献   

Preface     

Roy MacLeod 《Minerva》2007,45(2):113-114

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Introduction     

Gemelli  Giuliana  Macleod  Roy 《Minerva》2003,41(2):95-99

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Outcomes assessment: Collaboration between schools of social work     

Roy W. Rodenhiser  Victoria Buchan 《Assessment Update》1996,8(1):9-15

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