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1.
The paper compares the numerical performances of the LDL decomposition of the BFGS variable-metric algorithm, the Dennis-Mei dogleg algorithm on the BFGS update, and Davidon's projections with the BFGS update with the straight BFGS update on a number of standard test problems. Numerical results indicate that the standard BFGS algorithm is superior to all of the more complex strategies.This research was supported by the National Science Foundation under Research Grant No. MCS77-07327. 相似文献
2.
We report on an intracavity optical parametric oscillator (OPO) placed within a compact diode-pumped Nd:YALO laser cavity. This OPO utilizes a pair of KTP crystals, which are diffusion bonded together in a walk-off-compensated configuration. We have generated up to 21.4 W of 2-mum radiation, operating in a few-kilohertz range. 相似文献
3.
We propose a new scheme for generating radially polarized light by mimicking optical activity using linear birefringence. It involves a birefringent spirally varying retarder sandwiched between two orthogonally oriented quarter-wave plates. Using Poincaré sphere representation, we show that the polarization transformation of such a scheme is equivalent to that of a spirally varying optical activity and is capable of generating radially polarized light. We demonstrate the proof-of-concept using y-cut crystalline quartz. 相似文献
4.
The charged-particle multiplicity distribution and forward-backward correlation ofe + e ? annihilation at 29 GeV are discussed on the basis of a mixed two-component model. 相似文献
5.
The Bose-Einstein distribution is used to investigate Landau's hydrohynamical model with viscosity. In case the viscosity dependence on the temperature isT 3, the correction to the multiplicity behaves like 1/E and is found to be negligible for thepp data. A discussion is presented on a possibility of reconcilingE 1/2 and logE dependence of the multiplicity law. 相似文献
6.
Kang Hoh Phua 《BIT Numerical Mathematics》1988,28(3):709-718
Abaffy, Broyden, and Spedicato (ABS) have recently proposed a class of direct methods for solving nonsparse linear systems. It is the purpose of this paper to demonstrate that with proper choice of parameters, ABS methods exploit sparsity in a natural way. In particular, we study the choice of parameters which corresponds to an LU-decomposition of the coefficient matrix. In many cases, the fill-in, represented by the nonzero elements of the deflection matrix, uses less storage than the corresponding fill-in of an explicit LU factorization. Hence the above can be a viable and simple method for solving sparse linear systems. A simple reordering scheme for the coefficient matrix is also proposed for the purpose of reducing fill-in of the deflection matrices. 相似文献
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S. L. Lim Y. K. Lim C. H. Oh K. K. Phua 《Zeitschrift fur Physik C Particles and Fields》1989,43(4):621-624
The forward-backward multiplicity correlation over the full pseudorapidity range forpp andp \(\bar p\) collisions at ISR and Collider energies have been analysed in terms of a Chou-Yang Type multiplicity distribution which consists of a stochastic (binomial) component forz=n F ?n B and a nonstochastic (negative binomial) component forn=n F +n B . Reasonable agreement with experimental data is obtained if the final-state particles are assumed, in a cluster model, to be created by the decay of clusters with a mean cluster size (charged particles per cluster) which is energy-dependent. 相似文献
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