109,864 research outputs found
shim
No full textshim n"pine shim" wooden implement used on ship to prepare and stir fish chowder made in big iron potDNE-cit W.J.KIRWIN MAR 4 1965Jan 65 WKUsed I and SupUsed I and Sup3Used Ishem, Shin, MUNDLE, SLICE, wedge.The source is listed as P 148-65 in DNE
A control theoretic approach to malaria immunotherapy with state jumps
No full textWe investigate a control method for malaria dynamics to boost the immune response using a model-based approach. The idea of state jump is introduced and discussed using a hybrid model. To implement the state jumps we use a physiologically feasible method for the biological system, whereby the introduction of a pathogen into the system steers it to a desirable status. It is noted that we take advantage of a pathogen to implement state jumps in the system. The study is supported by recently reported experimental results
Data Reuse Method between Heterogeneous Partitions (DRHP) in H.264/AVC motion compensator
No full textDevelopent of an improved B0-shim method on the 7 tesla Magnetom Terra MRI scanner
No full textMagnetresonanstomografi avhenger av et svært homogent og statisk magnetfelt for å unngå bildeforvrenginger og tap av signalstyrke. Prosedyren som retter opp små variasjoner i skannerens hovedmagnetfelt kalles B0-shimming, og kan gjennomføres ved å optimalisere strømmen som gis til skannerens shim-spoler. Disse shim-spolene generer magnetfelt som kan kombineres for å motvirke de underliggende B0-inhomogenitetene. Målet med dette prosjektet var å erstatte leverandørens shim-metoden på Siemens’ 7 tesla Magnetom Terra skanner, som har vist seg å ikke være optimalisert. Vi har utviklet en dobbel-ekko gradient-ekko sekvens for å måle variasjonene i B0-feltet, med det underliggende målet om å gjøre utlesningen av de to ekkoene så like som mulige. Repetisjonstiden og endringshastigheten til gradientene ble justert for å minimalisere bidraget av eddy-strømmer i den resulterende B0-kartet. Etter at skannerens shim-spoler var kalibrert, ble optimaliseringskoder fra et annet prosjekt benyttet for å beregne den optimale shim-strømmen til hver spole. Kalibreringen ble gjort ved å representere feltet fra hver shim-spole som en lineærkombinasjon av sfærisk-harmoniske funksjoner opp til 4. orden. Den endelige shim-prosedyren ble sammenlignet med metoden til leverandøren ved å teste dem på hjernen til to uparede grupper av frivillige og så utføre en Wilcoxon rank-sum test på spredningen i det resulterende B0-kartet. Resultatet fra testen konstaterer tydelig at den nye shim metoden er signifikant bedre en metoden fra leverandøren
A magnetization mapping approach for passive shim design in MRI
No full textA new passive shim design method is presented which is based on a magnetization mapping approach. Well defined regions with similar magnetization values define the optimal number of passive shims, their shape and position. The new design method is applied in a shimming process without prior-axial shim localization; this reduces the possibility of introducing new errors. The new shim design methodology reduces the number of iterations and the quantity of material required to shim a magnet. Only a few iterations (1-5) are required to shim a whole body horizontal bore magnet with a manufacturing error tolerance larger than 0.1 mm and smaller than 0.5 mm. One numerical example is presente
Neotrombicula (Neotrombicula) kwangneungensis Shin, Kim, Lee, Yoon and Shim 1990
No full textNeotrombicula (Neotrombicula) kwangneungensis Shin, Kim, Lee, Yoon and Shim, 1990: PALPublished as part of Nielsen, David H., Robbins, Richard G. & Rueda, Leopoldo M., 2021, Annotated world checklist of the Trombiculidae and Leeuwenhoekiidae (1758 - 2021) (Acari: Trombiculoidea), with notes on nomenclature, taxonomy, and distribution, pp. 1-243 in Zootaxa 4967 (1) on page 167, DOI: 10.11646/zootaxa.4967.1.1, http://zenodo.org/record/474551
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Effect of Shim Arm Depletion in the NBSR
No full textThe cadmium shim arms in the NBSR undergo burnup during reactor operation and hence, require periodic replacement. Presently, the shim arms are replaced after every 25 cycles to guarantee they can maintain sufficient shutdown margin. Two prior reports document the expected change in the 113Cd distribution because of the shim arm depletion. One set of calculations was for the present high-enriched uranium fuel and the other for the low-enriched uranium fuel when it was in the COMP7 configuration (7 inch fuel length vs. the present 11 inch length). The depleted 113Cd distributions calculated for these cores were applied to the current design for an equilibrium low-enriched uranium core. This report details the predicted effects, if any, of shim arm depletion on the shim arm worth, the shutdown margin, power distributions and kinetics parameters
A simple method to determine pressure curve for sheet hydro-forming and experimental verification
No full textA simple method to determine optimal pressure curve for sheet hydro-forming has been proposed. The determination of the pressure curve is carried out by characterizing the curve three parameters, e.g. initial pressure, final pressure and pressure path. Through the study of previous works, general shape of the pressure curve for hydro-forming is monotonically increasing with respect to a punch stroke. Since the penetration volume to a pressure chamber by a punch is of the similar characteristics as the punch stroke, and the shape of the pressure-stroke curve is non-linear in general, the pressure path is assumed to be proportional to the penetration volume by a punch, rather than punch stroke. During the hydro-forming experiment, it is observed that the major cause of failures in the early forming stage is related to lifting of a blank from a die surface due to the penetration of punch. Now the initial pressure is determined from the lifting-prevention condition. From the initial pressure, the assumption of pressure path and some chosen trial final pressure values, the pressure curves are interpolated in a straightforward manners. Then, FE analyses are carried out to predict whether failure occurs or not. From the result of FE analysis, optimal final pressure curve has been determined among the trial final pressure curves. The corresponding experiment has been carried out with an experimental hydro-forming press where the pressure is controlled by a proportional relief valve. The press is relatively inexpensive, under an open-loop control system. Through the comparison of experiment and analysis, the predicted pressure curve has been verified an optimal for the successful forming since no defect has been observed. (c) 2005 Elsevier B.V. All rights reserved
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