On Born approximation in black hole scattering

A massless field propagating on spherically symmetric black hole metrics such as the Schwarzschild, Reissner-Nordstr\"{o}m and Reissner-Nordstr\"{o}m-de Sitter backgrounds is considered. In particular, explicit formulae in terms of transcendental functions for the scattering of massless scalar particles off black holes are derived within a Born approximation. It is shown that the conditions on the existence of the Born integral forbid a straightforward extraction of the quasi normal modes using the Born approximation for the scattering amplitude. Such a method has been used in literature. We suggest a novel, well defined method, to extract the large imaginary part of quasinormal modes via the Coulomb-like phase shift. Furthermore, we compare the numerically evaluated exact scattering amplitude with the Born one to find that the approximation is not very useful for the scattering of massless scalar, electromagnetic as well as gravitational waves from black holes

Track E Implementation Science, Health Systems and Economics

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138412/1/jia218443.pd

25th Annual Computational Neuroscience Meeting: CNS-2016

Abstracts of the 25th Annual Computational Neuroscience Meeting: CNS-2016 Seogwipo City, Jeju-do, South Korea. 2–7 July 201

S-D logic-informed customer engagement: Integrative framework, revised fundamental propositions, and application to CRM

Advance online in 2016</p

Method for weaving and tatting combined shell fabric

Inventor name used in this publication: 王宏华Inventor name used in this publication: 赵远方Inventor name used in this publication: 李鹂Inventor name used in this publication: 杨晨啸Title in Traditional Chinese: 一種用於織造針織梭織結合面料的方法China202212 bcchVersion of RecordPublishe

High-efficiency white light emission using a phosphorescent sensitizer in organic light-emitting devices

We have fabricated white organic light-emitting devices by using the phosphorescent material fac tria (2-phenylpyridine) iridium [Ir(ppy 3)] as a sensitizer, as a result, the efficiency of these devices is improved dramatically. Ir(ppy)3 and the fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl) (DCITB) are co-doped into 4,4′-N,N′-dicsrbazole-biphenyl (CBP) host, whose thickness affects both color and efficiency of the devices. Tris (8-hydroxyquincline) aluminum (Alq) and 2,9-dimethyl-4,7-diphenyl-1,10- phenanthroline (bathocuproine or BCP) are used as electron-transporting and exciton-blockiag layers, respectively, and N,N′-diphenyl-N,N′-bis(1. naphthyl)-(1,1′-biphenyl)-4,4′diamine (NPB) as a blue light-emitting as well as hole-transporting layer. The maximum efficiencies of the devices with 15 and 20 nm co-doped BCP tuning layer are 7.5 and 8.6 cd/A, respectively, and the former presents fairly pure white emission with CIE coordinates of (0.33, 0.32) at 10 V, which is very stable at various biases (10 19V).Link_to_subscribed_fulltex