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排序方式: 共有85条查询结果,搜索用时 250 毫秒
1.
Benjamin Mills Dmytro Kundys Maria Farsari Sakellaris Mailis Robert W. Eason 《Applied Physics A: Materials Science & Processing》2012,108(3):651-655
Single ultra-short pulses from Gaussian and vortex beams have been used for the fabrication of complex micro-structures via multi-photon polymerization. The complexity of the resultant micro-structures stems from the modification of both transverse intensity and phase profiles of these single pulses to create modulated scaffolds and hollow cylinders. Experimental results are compared to theoretical models, and good agreement is shown. 相似文献
2.
M. Feinaeugle C. L. Sones E. Koukharenko B. Gholipour D. W. Hewak R. W. Eason 《Applied Physics A: Materials Science & Processing》2013,112(4):1073-1079
We present a laser-based transfer method for the novel application of fabricating elements for planar thermoelectric devices. Thin films of thermoelectric chalcogenides (Bi2Te3, Bi2Se3 and Bi0.5Sb1.5Te3) were printed via laser-induced forward transfer (LIFT) onto polymer-coated substrates over large areas of up to ~15 mm2 in size. A morphological study showed that it was possible to partially preserve the polycrystalline structure of the transferred films. The films’ Seebeck coefficients after LIFT transfer were measured and resulted in ?49±1 μV/K, ?93±8 μV/K and 142±3 μV/K for Bi2Te3, Bi2Se3 and Bi0.5Sb1.5Te3, respectively, which were found to be ~23±6 % lower compared to their initial values. This demonstration shows that LIFT is suitable to transfer sensitive, functional semiconductor materials over areas up to ~15 mm2 with minimal damage onto a non-standard polymer-coated substrate. 相似文献
3.
P. Girtler G. Otter G. Rudolph H. Böttcher R. Nahnhauer J. Figiel D.R.O. Morrison K.L. Wernhard K.W.J. Barnham R.M. Eason B. Pollock B. Buschbeck M. Markytan W. Mitaroff J. MacNaughton H. Rohringer 《Nuclear Physics B》1979,156(2):189-206
A new method to calculate diffractive mass spectra has been developed. It is applied to K-p interactions at 10 and 16 GeV/c. Cross sections and mass spectra are given for the difractive dissociation processes p→(N+iπ) and K-p→(K+iπ) for i = 1 to 5 and also summed over all multiplicities. In addition to the diffractive peak at low mass coming from low multiplicities, a long tail extending to high masses and high multiplicities has been found. The multiplicity structure of diffraction dissociation can be understood in the context of the two-step dynamical picture of Pokorsky and Van Hove. 相似文献
4.
Résumé L'auteur examine la propagation des ondes d'une cavité sphérique ou cylindrique dans une substance avec une isotropie transversale et curviligne. Il traite d'une manière assez détaillée le cas particulier d'un solide infini dans lequel existe un trou sphérique ou cylindrique, et les résultats numériques sont donnés sous une forme graphique pour le trou cylindrique avec un démarrage à fonction type unitaire. 相似文献
5.
G. Otter H. Remplewski G. Rudolph L. Becker R. Klein W. Lohmann H.J. Schreiber K. Böckmann U. Idschok J. Lowsky B. Schröder D.J. Kocher D.R.O. Morrison K.-L. Wernhard T. Coghen K.W.J. Barnham R. Eason H. Rohringer 《Nuclear Physics B》1979,155(2):295-306
Results are presented for p → (ΛK+) dissociation in the reactions K?p → ΛK+K? and and π±p → ΛK+π±at 10 and 16 GeV/c. The cross sections for the low-mass ΛK+ enhancement are compatible with the energy dependence σ ∝ plab?0.3. The t′ spectra or the (ΛK+) threshold enhancement are exponential in shape. Its decay angular distribution reveals neither s-channel nor t-channel helicity conservation. The relative probabilities of the processes dissociation are in the ratios 100 : 10 : 0.2, independent of the nature of the incident particle. 相似文献
6.
This paper presents results computed using a meshless method in a point collocation formulation to investigate the effects of temperature and frequency on the magnetization switching mode in the circular amorphous magneto-impedance sensor (element). Specifically, the solutions characterizing the MI effect are solved from a set of coupled nonlinear equations consisting of the Maxwell’s equations, the Landau-Lifshitz-Gilbert equation, and the thermal diffusion equation. This coupled nonlinear space-time model predicts the formation and propagation of dynamic domain walls in switching and it is shown how they contribute to experimentally observed temperature and frequency effects. Computed results (that agree well with reported experimental data) suggest radial domain walls may play a larger role in the MI effect than originally believed even for the realistic conditions considered here at 1 MHz or more. 相似文献
7.
L. Lorini N. Ashby A. Brusch S. Diddams R. Drullinger E. Eason T. Fortier P. Hastings T. Heavner D. Hume W. Itano S. Jefferts N. Newbury T. Parker T. Rosenband J. Stalnaker W. Swann D. Wineland J. Bergquist 《The European physical journal. Special topics》2008,163(1):19-35
The record of atomic clock frequency comparisons at NIST over the past half-decade provides one of the tightest constraints
of any present-day temporal variations of the fundamental constants. Notably, the 6-year record of increasingly precise measurements
of the absolute frequency of the Hg+ single-ion optical clock (using the cesium primary frequency standard NIST-F1) constrains the temporal variation of the fine
structure constant α to less than 2 · 10−6yr−1 and offers a Local Position Invariance test in the framework of General Relativity. The most recent measurement of the frequency
ratio of the Al+ and Hg+ optical clocks is reported with a fractional frequency uncertainty of ±5.2 · 10−17. The record of such measurements over the last year sensitively tests for a temporal variation of α and constrains , consistent with zero. 相似文献
8.
M. S. B. Darby T. C. May-Smith R. W. Eason 《Applied Physics A: Materials Science & Processing》2008,93(2):477-481
We have demonstrated pulsed laser deposition of Nd-doped gadolinium gallium garnet on Y3Al5O12 by the simultaneous ablation of two separate targets of Nd:Gd3Ga5O12 (GGG) and Ga2O3. Such an approach is of interest as a method of achieving stoichiometry control over films whilst the growth parameters are
kept constant and optimal for high quality crystal growth. We show here how the stoichiometry and resultant lattice parameter
of a film can be controlled by changing the relative deposition rates from the two targets. Films have been grown with enough
extra Ga to compensate for the deficiency that commonly occurs when depositing only from a GGG target. We have also grown
crystalline GGG films with an enriched Ga concentration, and this unconventional approach to film stoichiometry control may
have potential applications in the fabrication of films with advanced compositionally graded structures. 相似文献
9.
10.
Anderson AA Eason RW Hickey LM Jelinek M Grivas C Gill DS Vainos NA 《Optics letters》1997,22(20):1556-1558
We document the lasing performance of a waveguiding layer of Ti:sapphire, of ~12-mum thickness, grown by pulsed laser deposition from a 0.12-wt.% Ti(2)O(3) Ti:sapphire single-crystal target onto an undoped z-cut sapphire substrate. Lasing around 800 nm is observed when the waveguide layer is pumped by an argon-ion laser running on all-blue-green lines, with an absorbed power threshold of 0.56 W, with high-reflectivity (R>98%) mirrors. With a 5% pump duty cycle and a T=35% output coupler, a slope efficiency of 26% with respect to absorbed power is obtained, giving quasi-cw output powers in excess of 350 mW. 相似文献