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排序方式: 共有47条查询结果,搜索用时 15 毫秒
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C.J. Batty S.F. Biagi M. Blecher R. Kunselman R.A.J. Riddle B.L. Roberts J.D. Davies G.J. Pyle G.T.A. Squier D.M. Asbury M. Leon 《Nuclear Physics A》1978,296(3):361-372
The attenuation due to the E2 nuclear resonance effect has been measured in hadronic atoms using pions with 111Cd and 112Cd, and for kaons with 122Sn. Energies of the relevant X-ray and γ-ray transitions and of the X-ray cascade intensities have also been measured so as to give a self-consistent set of information. The results are found to be in very good agreement with theoretical calculations. 相似文献
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We have examined the basic assumptions leading to optimized performance of small photo-acoustic resonators. Previous attempts at miniaturizing photo-acoustic systems have found the loading of the microphone on the cavity to be insignificant. We have shown theoretically and tested experimentally the fact that the microphone loading can have a dramatic effect on the resonator behavior. Treatment of the pressure and volume velocity of the sound waves as analogs of voltage and current facilitates the use of standard electrical engineering techniques and leads to techniques that enable one to efficiently optimize the impedance match between the cavity and the microphone. PACS 43.35.Ud; 43.20.Ks; 43.20.Mv 相似文献
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C.J. Batty S.F. Biagi M. Blecher S.D. Hoath R.A.J. Riddle B.L. Roberts J.D. Davies G.J. Pyle G.T.A. Squier D.M. Asbury A.S. Clough 《Physics letters. [Part B]》1978,76(1):44-46
The Doppler broadened 26Mg* decay gamma peak hasma peak has been observed in coincidence with stopped kaons in an Al target. The results are compared with predictions based on single-nucleon absorption of the kaon. 相似文献
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Riddle WR Li R Fitzpatrick JM DonLevy SC Dawant BM Price RR 《Magnetic resonance imaging》2004,22(6):769-777
Image registration is the process of establishing spatial correspondence between two images or between two image volumes. Registration can be achieved by rigid, elastic, or a combination of rigid and elastic transforms that attempt to bring the two images into coincidence. A rigid transform accounts for differences in positioning and an elastic transform describes deformations due to differences in tissue properties, temporal changes due to growth or atrophy, or differences between individuals. Deformation-based morphometry uses the resulting deformation fields from these transforms to evaluate differences between the images being registered. Three methods of registration were evaluated: rigid (affine) transformation, elastic optical flow transformation, and elastic spline transformation. All three methods produce vector deformation fields that map each point in one image to a point in the other image. A 12-color map of the transformation Jacobian was used to represent local volume changes. Using the three registration methods, color-mapped Jacobians were determined using a simulated three-dimensional block with known translation, rotation, expansion, contraction, and intensity modulations. Color-coded Jacobians were also generated for experimentally measured magnetic resonance image volumes of water-filled balloons and 7-year-old twin boys. Color-coded Jacobians overlaid on anatomical images provide a convenient method to identify regional tissue expansion and contraction. 相似文献
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The total cross sections of γγ→γZ process for γγ c.m.s. energy 91.2—2000GeV are presented. W loop contribution is dominating when γγ c.m.s. energy is larger than 140GeV. The total cross section has a maximum, 220 fb(|cosθ|33cm-2·s-1 in which case more than 6000 events for γγ→γZ would be observable. In principle this process provides a test of the non-abelian nature of the standard model, especially the anomalous triple and quartic W-boson vertices. 相似文献
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