8,226 research outputs found
Good Words (Magazine) for 1868
No full textAs Abbey writes, the fable articles here precede and are different from their first appearance in book form a year later. For it was then that Ralston published the first edition of Krilof and His Fables. See my comments on the third (1871) and fourth (1883) editions. The book smells of its many years! The three fable articles are on 39-46, including six illustrations on 40-41; 215-221, including six illustrations on 216-17; and 413-20, including six illustrations on 416-17. These are magazine articles. They comment on Krilof's views and particularly on Russian foibles. Thus one prose text after another is integrated into the article. In the book, there will be, after a preface and a memoir, a simple collection of texts. In fact, the selection of Krilof fables within the article here is excellent, and the author puts them into a good cultural and political context. At least some of the illustrations are the same as those in the third edition.. The texts are close to those found in the published books. It makes sense to see the texts in the magazine here as forerunners of those fable texts there. I presume that Ralston had opportunity to edit and amend between his magazine articles and his book's first edition. The publisher of the magazine is of course the publisher of the third edition that I have. The print is minuscule! I needed a magnifying glass for normal reading. The index just after 774 assigns J.B. Zwecker and A.B. Houghton as illustrators for the eighteen illustrations in the three fable articles. Dalziel, Houghton, and Zwecker are the names I can make out on the illustrations. Dalziel is not mentioned on the title page, but there is reference to others.This is a hardbound book (hard cover)Norman MacLeod; W.R.S. Ralston for fable
Model predictive control of a hybrid autonomous underwater vehicle with experimental verification
Full text linkIn this work model predictive control is used to provide transit and hover capabilities for an autonomous underwater vehicle where the description of the system dynamics used include terms measured experimentally. The resulting controller manoeuvres the vehicle in the presence of constraints on the actuators and results obtained from the deployment of the vehicle in an inland lake for the study of the Zebra mussel, an invasive species, are also given
Simple drag prediction strategies for an Autonomous Underwater Vehicle’s hull shape
No full textThe range of an AUV is dictated by its finite energy source and minimising the energy consumption is required to maximise its endurance. One option to extend the endurance is by obtaining the optimum hydrodynamic hull shape with balancing the trade-off between computational cost and fluid dynamic fidelity. An AUV hull form has been optimised to obtain low resistance hull. Hydrodynamic optimisation of hull form has been carried out by employing five parametric geometry models with a streamlined constraint. Three Genetic Algorithm optimisation procedures are applied by three simple drag predictions which are based on the potential flow method. The results highlight the effectiveness of considering the proposed hull shape optimisation procedure for the early stage of AUV hull desig
Author Correction: Attosecond angular streaking and tunnelling time in atomic hydrogen
No full textCorrection to: Nature, 568, pp. 75–77 (2019), https://doi.org/10.1038/s41586-019-1028-3, published online 18 March 2019.
In this Letter, the statement ‘I.I. and A.B. performed their computations at the NCI Australia’ was missing from the Acknowledgements section. The original Letter has been corrected online.No Full Tex
Ordinary And Extraordinary Giant Hall Effects In Co-sio2 Granular Films
No full textMagnetization, resistance and Hall effect are studied in granular magnetic Co-SiO2 nanocomposites in the temperature range 5-300 K and fields up to 6 T. Relative contributions from spin-independent and spin-dependent processes to the giant Hall effect near the metal-insulator transition are analysed. © 2001 Published by Elsevier Science B.V.226-230PART I680682Hurd, C.M., (1972) The Hall Effect in Metals and Alloys, , Plenum Press, New YorkPakhomov, A.B., Yan, X., Zhao, B., (1995) Appl. Phys. Lett., 67, p. 3497Jing, X.N., Wang, N., Pakhomov, A.B., Fung, K.K., Yan, X., (1996) Phys. Rev. B, 53, p. 14032Zhao, B., Yan, X., (1997) J. Appl. Phys., 81, p. 4290Aronzon, B.A., Kovalev, D.Y., Lagar'Kov, A.N., Meilikhov, E.Z., Ryl'Kov, V.V., Sedova, M.A., Negre, N., Leotin, J., (1999) JETP Lett., 70, p. 90Xu, Q.Y., Ni, G., Sang, H., Du, Y.W., (2000) J. Appl. Phys., 87, p. 6998Gang, N., Lu, J., Xu, Q.Y., Sang, H., Du, Y.W., (1999) Acta Phys. Sinica, 48, pp. S47Chiriac, H., Lozovan, M., Urse, M., (2000) J. Magn. Magn. Mater., 215, p. 535Zhang, X.X., Liu, H., Pakhomov, A.B., (2000) Physica B, 279, p. 81Aronzon, B.A., Meilikhov, E.Z., Rylkov, V.V., Lagarkov, A.N., Sedova, M.A., Evstushina, I.A., Kovalev, D.Y., Leotin, J., (2000) Physica. B, 284, p. 1980Luo, E.Z., Pakhomov, A.B., Zhang, Z.Q., Chan, M.C., Wilson, I.H., Xu, J.B., Yan, X., (2000) Physica. B, 279, p. 98Chan, M.C., Pakhomov, A.B., Zhang, Z.Q., (2000) J. Appl. Phys., 87, p. 1584Denardin, J.C., Pakhomov, A.B., Knobel, M., Liu, H., Zhang, X.X., (2000) J. Phys.: Condens. Matter, 12, p. 3397Holstein, T., (1961) Phys. Rev., 124, p. 1329Vedyaev, A.V., Kotel'Nikova, O.A., Pugach, N.G., Ryzhanova, N.V., (2000) JETP, 90, p. 103
The use of computational fluid dynamics to assess the hull resistance of concept autonomous underwater vehicles
Full text linkAutonomous Underwater Vehicles (AUV’s) provide an important tool for collecting detailed scientific information from the oceans depths. The hull resistance of an AUV is an important factor in determining the powering requirements and range of the vehicle. This paper discusses the use of Computational Fluid Dynamics (CFD) to determine the hull resistance of three existing AUV’s, of differing shape and size. The predictions are compared with available experimental data and good agreement found. This work has demonstrated that with use of suitable shape parameterisation it is possible to carry out concept design evaluation using a RANS flow solver
N-fold way simulated tempering for pairwise interaction point processes
Full text linkPairwise interaction point processes with strong interaction are usually difficult to
sample. We discuss how Besag lattice processes can be used in a simulated tempering
MCMC scheme to help with the simulation of such processes. We show how
the N-fold way algorithm can be used to sample the lattice processes efficiently
and introduce the N-fold way algorithm into our simulated tempering scheme. To
calibrate the simulated tempering scheme we use the Wang-Landau algorithm
Experimental Verification of a Depth Controller using Model Predictive Control with Constraints onboard a Thruster Actuated AUV
Full text linkIn this work a depth and pitch controller for an autonomous underwater vehicle (AUV) is developed. This controller uses the model predictive control method to manoeuvre the vehicle whilst operating within the defined constraints of the AUV actuators. Experimental results are given for the AUV performing a step change in depth whilst maintaining zero pitch
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