Reconstruction of Bandlimited Functions from Unsigned Samples

We consider the recovery of real-valued bandlimited functions from the absolute values of their samples, possibly spaced nonuniformly. We show that such a reconstruction is always possible if the function is sampled at more than twice its Nyquist rate, and may not necessarily be possible if the samples are taken at less than twice the Nyquist rate. In the case of uniform samples, we also describe an FFT-based algorithm to perform the reconstruction. We prove that it converges exponentially rapidly in the number of samples used and examine its numerical behavior on some test cases

Crystallization, data collection and data processing of maltose-binding protein (MalE) from the phytopathogen Xanthomonas axonopodis pv. citri

Maltose-binding protein is the periplasmic component of the ABC transporter responsible for the uptake of maltose/maltodextrins. The Xanthomonas axonopodis pv. citri maltose-binding protein MalE has been crystallized at 293 Kusing the hanging-drop vapour-diffusion method. The crystal belonged to the primitive hexagonal space group P6_122, with unit-cell parameters a = 123.59, b = 123.59, c = 304.20 Å, and contained two molecules in the asymetric unit. It diffracted to 2.24 Å resolution

Multiple plasmon resonances in naturally-occurring multiwall nanotubes: infrared spectra of chrysotile asbestos

Chrysotile asbestos is formed by densely packed bundles of multiwall hollow nanotubes. Each wall in the nanotubes is a cylindrically wrapped layer of $Mg_3 Si_2 O_5 (OH)_4$. We show by experiment and theory that the infrared spectrum of chrysotile presents multiple plasmon resonances in the Si-O stretching bands. These collective charge excitations are universal features of the nanotubes that are obtained by cylindrically wrapping an anisotropic material. The multiple plasmons can be observed if the width of the resonances is sufficiently small as in chrysotile.Comment: 4 pages, 5 figures. Revtex4 compuscript. Misprint in Eq.(6) correcte

Prediction of strain localization during sheet metal forming using bifurcation analysis and Gurson- type damage - Complas XI

The strain localization phenomenon that may occur during sheet metal forming represents a major cause of defective parts produced in the industry. Several instability criteria have been developed in the literature to predict the occurrence of these instabilities. The proposed work aims to couple a Gurson-type model to the Rice’s localization criterion. The implementation of the modeling is achieved via a user subroutine (Umat) in Abaqus/std using a Runge-Kutta explicit integration scheme. Finally, we show the effectiveness of the proposed coupling for the prediction of the formability of stretched metal sheets

Who You Gonna Call?: Creating a Call List for Your Facility\u27s Disaster Plan

Preservation can involve responding to active and pressing matters. But not all buildings are lost to the bulldozer. Many are lost to natural and human disasters like storms and water. A Disaster Plan is a common document used by museums and history organizations. Learn how to develop a contact list for a Disaster Response Plan so you know whom to call when disaster strikes

Eficiência agronômica de fontes de fósforo associadas à inoculação com Pseudomonas fluorescens na produtividade de grãos do milho.

Visando a melhor eficiência agronômica relativa (EAR) do uso dos fertilizantes fosfatados, este estudo teve como objetivo avaliar o efeito de fontes de P associados à inoculação com Pseudomonas fluorescens via sementes na produtividade de grãos de plantas de milho. O experimento foi conduzido a campo, em esquema fatorial 6x2, em blocos casualizados, com quatro repetições. Foram aplicados 120 kg ha-1 de P via solo por meio de cinco fontes: Superfosfato Triplo (SFT), Gafsa, Itafós, SFT+Gafsa e SFT+Itafós, além do controle (sem P). As sementes foram submetidas a dois níveis de inoculação (com e sem) com Pseudomonas fluorescens da Estirpe 1008. Realizou-se a avaliação da EAR da produtividade de grãos. A inoculação de P. fluorescens no controle resultou em 87% de EAR. As aplicações de SFT+Itafós e SFT+Gafsa podem ser uma alternativa para os sistemas agrícolas, visando a menor utilização de fosfatos acidulados. O desempenho produtivo do milho não foi alterado pelas fontes de P e níveis de inoculação com P. fluorescens