排序方式: 共有49条查询结果,搜索用时 109 毫秒
31.
32.
Pulsed laser operation of a new high Cr4+ concentration forsterite crystal is reported. Slope efficiencies of 13% and 5% have
been obtained for 1064 and 532nm pumping. Results are compared with the performance of three other forsterite crystals. A
threefold enhancement in operating efficiency is obtained over standard low dopant-level material. Tuning ranges have also
been investigated.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
33.
Partially supported KOSEF Research Grant 91-08-00-07 and KOSEF 921-0100-018-2 相似文献
34.
Given modular forms f and g of weights k and ?, respectively, their Rankin-Cohen bracket corresponding to a nonnegative integer n is a modular form of weight k+?+2n, and it is given as a linear combination of the products of the form f(r)g(n−r) for 0?r?n. We use a correspondence between quasimodular forms and sequences of modular forms to express the Dirichlet series of a product of derivatives of modular forms as a linear combination of the Dirichlet series of Rankin-Cohen brackets. 相似文献
35.
Youngju Kim Hidenori Watanabe Bieong-Kil Kim Young-Bae Seu 《Tetrahedron: Asymmetry》2011,22(16-17):1658-1661
In order to develop new methyl substituted chiral building blocks which are useful for the synthesis of methyl branched natural products, the enantioselective bioreduction of an exo-methylene to a methyl group was investigated. 4-Acetoxy-2-methylene-1-butanol 3 was prepared from itaconic acid over four steps and converted to the chiral alcohol (R)-4-acetoxy-2-methyl-1-butanol 4, by growing cells of Pseudomonas putida. The bioconversion achieved a high enantioselectivity (92% ee) and a high chemical yield (65%) within a relatively short reaction time (18–20 h). 相似文献
36.
Youngju Kim 《Geometriae Dedicata》2017,188(1):51-61
In this paper, we generalize a Schottky group construction to complex hyperbolic space. In particular, we construct a fundamental domain whose sides consist of disjoint non-asymptotic packs for the action of the Schottky group acting on complex hyperbolic space. Then we prove that a smooth deformation of such a Schottky group is quasiconformally stable. 相似文献
37.
Vignéras constructs non-holomorphic theta functions according to indefinite quadratic forms with arbitrary signature. We use
Vignéras’ theta functions to create examples of non-holomorphic Jacobi forms associated to indefinite theta series by two
different methods. 相似文献
38.
39.
It is well-known that the length spectrum of a geometrically finite hyperbolic manifold is discrete. In this paper, we begin
a study of the length spectrum for geometrically infinite hyperbolic surfaces. In this generality, it is possible that the
spectrum is not discrete and the main focus of this work is to find necessary and sufficient conditions for a geometrically
infinite surface to have a discrete spectrum. After deriving a number of properties of the length spectrum, we show that every
topological surface of infinite type admits both an infinite dimensional family of quasiconformally distinct hyperbolic structures
having a discrete length spectrum, and an infinite dimensional family of quasiconformally distinct structures with a nondiscrete
spectrum. Moreover, there exists such an infinite dimensional subspace arbitrarily close to (in the Fenchel-Nielsen topology)
any hyperbolic structure.
相似文献
40.
We incorporate the non-critical values of L-functions of cusp forms into a cohomological set-up analogous to the one of Eichler, Manin and Shimura. We use the 1-cocycles
we associate in this way to non-critical values to prove an expression for such values which is similar in structure to Manin’s
formula for the critical value of the L-function of a weight 2 cusp form.
YoungJu Choie is partially supported by KOSEF R01-2003-00011596-0 and by ITRC Research Fund.
N. Diamantis is partially supported by EPSRC grant EP/D032350/1. 相似文献