4,012 research outputs found
ABCNER 1
No full textHere is a chance find in an antique store. It complements the second and third readers, found, respectively, two and fourteen years ago. Alas, it does not contain fables, but I will include it in the collection to help complete the early set from American Book Company. This reader is in fair condition.This is a hardbound book (hard cover)By A.J. Demarest and William M. Van Sickl
ABCNER 2
No full textTwelve years ago I found Book Three of this series in Knoxville. I have it listed under 1901. Now I have found Book Two in an antiques collective outside Omaha. There is only one fable included here -- TMCM (119) -- and it is handled in an unusual fashion. Many city mice visit the country, and many country mice then visit the city. There human beings intrude twice, and that is enough to send the country mice home. The moral goes in a slightly different direction from the morals of most versions of this fable: Those who have the plain things of life are sometimes more happy than the rich (120). This reader is in very good condition.This is a hardbound book (hard cover)By A.J. Demarest and William M. Van Sickl
Drag Reduction by Applying Speedstrips on Rowing Oars
No full textAbstractThe objective of this study was to determine the advantage of the application of speedstrips to rowing oars for a lightweight single sculler. The research method comprehended three steps: (1) the analysis of the rowing oar movement, (2) the determination of the change in drag and (3) the composition of a rowing model to establish the advantage that could be achieved. The parameters needed for the model: boat velocity, oar angle velocity and power delivered by the rower, were recorded on a real single sculler. The change in drag due to speedstrips on cylinders was determined by performing wind tunnel experiments. The rowing model (Matlab) simulates a race by using real stroke data of a world-class rower as input, while calculating the drag with the coefficients determined by the wind tunnel experiments. The output of the model is the final advantage by the application of speedstrips to rowing oars. Speedstrips induce a 0.1% advantage over a 2000 m race under calm wind conditions. The advantage increases up to .4% with a headwind velocity of 5 m s-1. For bigger boats, the advantage could be even more significant
Drag and Power-loss in Rowing Due to Velocity Fluctuations
No full textAbstractThe flow motions in the turbulent boundary layer between water and a rowing boat initiate a turbulent skin friction. Reducing this skin friction results in better rowing performances. A Taylor-Couette (TC) facility was used to verify the power losses due to velocity fluctuations PV′ in relation to the total power , as a function of the velocity amplitude A. It was demonstrated that an increase of the velocity fluctuations results in a tremendous decrease of the velocity efficiency eV . The velocity efficiency eV for a typical rowing velocity amplitude A of 20 – 25% was about 0.92 – 0.95%. Suppressing boat velocity fluctuations with 60% will increase boat speed with 1.6%. Riblet surfaces were applied on the inner and outer cylinder wall to indicate the drag reducing ability of such surfaces. The results of the measurements at constant velocity are identical as the results reported earlier, while the experimental configuration was different. This confirms once more the consistency of the TC-system for drag studies. The maximum drag reduction DR was 3.4% at a Reynolds number Res 4.7 × 104, which corresponds to a shear velocity in this TC-system with water of V 4.7 m/s. For typical rowing velocity fluctuations, the riblets maintain to reduce the drag with 2.8% and corresponds to a averaged velocity increase of 0.9%. The drag reducing ability of riblets is partly lost due to velocity fluctuations with high amplitudes (A > 20%). From these results, it is concluded that the friction coefficient Cf will vary within one cycle. Higher acceleration/deceleration leads to a additional level of turbulent kinetic energy
A.J. Cronin. A doctor into lifelong writer
No full textReality and fiction might be strictly coexistent in the narrative world. The author of this article, after a deep reading of A.J. Cronin’s novels, has tried to find out the right key to penetrate into the novelist’s intricate world. After many interrogatives on A.J. Cronin both as a man and writer, the author , finally, has been able to grasp from the pages of the novelist, the suffering of a man who has made of his romance the history of his own life
New Education Readers: A Synthetic and Phonic Word Method: Book Three: Development of Obscure Vowels, Initials, and Terminals
No full textThe preface mentions that, to help the child maintain interest, the larger part of stories in this book consists of myth, legend, fable, biography, and fairy tale. There certainly are many fables included. Let me first mention those that handle their stories differently or are otherwise noteworthy. The Quarrel of the Lion and the Bear (10, illustrated) features a good use of If it had not been for by all three characters. In OR (20, illustrated), we find not a reed but a willow. The first phase involves only the oak and the wind. The last phase has the oak made into planks. For a change, it is a greedy little girl that needs to take a fistful of nuts from the pitcher (26). The owner of the goose in GGE is a woman in France (27). In DM (30, illustrated), the goat, sheep, cow, and horse all come by, one by one. The Fox and the Cock (30) opens with the fox asking the cock how many tricks he can do; the cock wants to learn more tricks, and the fox is willing to show him the trick where he closes an eye and shouts…. In BW (32, illustrated), the boy makes his call three or four times before the men stop coming. In The Dog and the Wolf (35, illustrated), the dog caught out in the open on a chair does not mention a wedding feast and does not specify a date when the wolf could come back and eat him. There is no first phase at the mouse's place in FM (79, illustrated), and the frog is only thinking of the fun he will have. The girl in MM (82, illustrated) practices tossing her head at other milkmaids! The Fox, the Bear, and the Farmer (103, twice illustrated) is new to me, and I enjoy it. It works like The Tiger and the Brahmin and then adds a second phase. The Story of Tommy and the Crows: A Fable (116, twice illustrated) is a pointed story about going to school. Other fables included here are FG (10), CP (12, illustrated), BC (13), SW (19, poor version), TH (34, illustrated), The Swallow (120, twice illustrated), and The Farmer and the Larks (157, illustrated). It pays to find books on the road; I have time in hotel rooms to review them thoroughly!This is a hardbound book (hard cover)By A.J. Demarest and William M. Van Sickl
Computing with cables: Towards massively parallel neuro computers
No full textElectrical Engineering, Mathematics and Computer Scienc
Radio Frequency Interference Mitigation in Radio Astronomy
No full textThe next generation of radio telescopes is expected to be one to two orders of magnitude more sensitive than the current generation. Examples of such new telescopes are the Low Frequency Array (LOFAR), currently under construction in the Netherlands, and the Square Kilometer Array (SKA), currently in a concept study phase. Another trend is that technological advances in the fields of electronics and communications systems have led to a vast increase in radio communication applications and systems, and also to an increasing demand for radio spectrum. These two trends, more sensitive telescopes and a much denser spectrum use, imply that radio astronomy will become more vulnerable to interference from radio transmitters. Although protection criteria exist for radio astronomy, it becomes increasingly difficult to keep the radio astronomy frequency bands free from interference. In order to mitigate interference in radio astronomical data, filtering techniques can be used. In this thesis, modern array signal processing techniques have been applied to narrow-band multichannel interference detection and excision, and to narrow-band spatial interference filtering. By investigating the subspace structure of the telescope array output covariance matrices, new results were found, such as upper limits on interference residuals after excision and spatial filtering. The effect of bandwidth, extendedness of the interfering sources, and multipath effects on the detection and spatial filter effectiveness were studied as well. The advantage of a multichannel approach over a single telescope approach was demonstrated by using experimental data from the Westerbork Synthesis Radio Telescope (WSRT). As the performance of mitigation algorithms can be improved by calibration of the telescope gains and noise powers, calibration algorithms were developed. These algorithms were verified both for single and dual polarised arrays. Finally, a LOFAR interference mitigation strategy was developed.Electrical Engineering, Mathematics and Computer Scienc
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