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The method of invariant imbedding has been used to resolve the solution of linear two-point boundary-value problems into contributions associated with the homogeneous equation with homogeneous boundary conditions, with inhomogeneous boundary conditions, and with an inhomogeneous source term in the equation. The relationship between the Green's function and the invariant imbedding equations is described, and it is shown that the Green's function can be determined from an initial-value problem. Several numerical examples are given which illustrate the efficacy of the initial-value algorithm.This work was supported by the US Atomic Energy Commission. 相似文献
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Protein-polymer conjugates are important in diverse fields including drug delivery, biotechnology, and nanotechnology. This feature article highlights recent advances in the synthesis and application of protein-polymer conjugates by controlled radical polymerization techniques. Special emphasis on new applications of the materials, particularly in biomedicine, is provided. 相似文献
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Branson A. Maynard Kelly S. Lynn Richard E. Sykora Anne E. V. Gorden 《Journal of Radioanalytical and Nuclear Chemistry》2013,296(1):453-457
Simple salts of the tetracyanoplatinate (TCP) anions with the general formula M[Pt(CN)4] x ·H2O have been described for over 200 years. A major structural feature of these compounds are pseudo one dimensional Pt···Pt interactions between the square planar tetracyanoplatinate anions. These interactions form quasi one-dimensional chains in the solid state and are believed to be the source of their unique spectroscopic and emission properties. The lanthanides offer the ability to tune the Pt···Pt spacing of these pseudo one dimensional chains, predictably by taking advantage of the lanthanide contraction. Here, we describe the emission and structural characteristics of new actinide tetracyanometallates. 相似文献
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P. A. Boyle J. M. Flynn A. Jüttner C. Kelly C. Maynard H. Pedroso de Lima C. T. Sachrajda J. M. Zanotti 《The European Physical Journal C - Particles and Fields》2010,69(1-2):159-167
Using partially twisted boundary conditions we compute the K→π semi-leptonic form factors in the range of momentum transfers $0\lesssim q^{2}\leq q^{2}_{\max}=(m_{K}-m_{\pi})^{2}$ in lattice QCD with N f =2+1 dynamical flavours. In this way we are able to determine $f_{+}^{K\pi}(0)$ without any interpolation in the momentum transfer, thus eliminating one source of systematic error. This study confirms our earlier phenomenological ansatz for the strange quark mass dependence of the scalar form factor. We identify and estimate potentially significant NNLO effects in the chiral expansion that guides the extrapolation of the data to the physical point. Our main result is $f_{+}^{K\pi}(0)=0.9599(34)(^{+31}_{-47})(14)$ , where the first error is statistical, the second error is due to the uncertainties in the chiral extrapolation of the lattice data and the last error is an estimate of potential discretisation effects. 相似文献