Experimental study on the electric-sweep scanner and ion beam emittance of electron cyclotron resonance ion source

With a latest developed electric-sweep scanner system, we have done a lot of experiments for studying this scanner system and ion beam emittance of electron cyclotron resonance (ECR) ion source. The electric-sweep scanner system was installed on the beam line of Lanzhou electron resonance ion source No. 3 experimental platform of Institute of Modem Physics. The repetition experiments have proven that the system is a relatively dependable and reliable emittance scanner, and its experiment error is about 10%. We have studied the influences of the major parameters of ECR ion source on the extracted ion beam emittance. The typical results of the experiments and the conclusions are presented in this article.

The study of oxygen spillover and back spillover on Pt/TiO2 by a potential dynamic sweep method

Oxygen spillover and back spillover on Pt/TiO2 catalysts have been studied by a potential dynamic sweep method. The characteristics of I-V profiles of Pt/TiO2 electrodes in the three potential sweep regions are different from those of Pt and TiO2 electrodes. The catalytic role of Pt/TiO2 in oxygen spillover and back spillover is identified. It decreases, and the electrochemical oxygen adsorption (or desorption) increases with elevating temperature of hydrogen post-treatment of Pt/TiO2; to a certain extent (hydrogen post-treatment of Pt/TiO2 at 700 degrees C), the control step of oxygen electrode process (anodic oxidation or cathodic reduction) changes from oxygen diffusion to electrochemical oxygen adsorption or desorption, respectively. Increasing the amount of Pt supported on TiO2 enhances the processes of oxygen spillover and back spillover. (C) 1999 Elsevier Science B.V. All rights reserved.

Supporting dynamic parameter sweep applications in workflows: lessons learnt from the CancerGrid project

A vast majority of scientific grid applications are either parameter sweep applications or a significant subpart of these applications belong to class of parameter sweep activities. The paper describes a new graphical workflow language in which any node of the DAG-based workflow can be a parameter sweep node and the execution of these nodes are transparently executed either in service grids or in desktop grids depending on the computational complexity of the workflow node. The new concept is supported by the CancerGrid portal that has been established for a chemist community.

A simple linear magnetic field sweep generator for magnetic resonance experiments

A simple and inexpensive linear magnetic field sweep generating system suitable for magnetic resonance experiments is described. The circuit, utilising a modified IC bootstrap configuration, generates field sweep over a wide range of sweep durations with excellent sweep linearity.

''The Sound Sweep'' de J. G. Ballard e a memória do som

A memória auditiva é um misto de lembrança e de construção. É neste binómio que se jogam as nossas memorias áudio, quer as individuais, quer as coletivas. Este ensaio parte do conto de Ballard, The Sound Sweep, como forma de lançar estas questões. Em The Sound Sweep Ballard descreve-nos uma cantora de ópera aposentada que anseia pelo seu regresso aos palcos. A razão da sua decadência deve-se ao aparecimento de uma nova manifestação musical, a música ultrassónica. Madame Gioconda torna-se amiga de Mangon, um jovem mudo mas que ouve muito bem. Mangon tem por profissão ser uma espécie de limpador de sons. Opera uma máquina chamada sonovac que tem por função apagar todos os vestígios de sons antigos. Mangon, mais algumas pessoas do círculo de Madame Gioconda, montam a estratégia de organizar um espetáculo que será o seu regresso à atividade, espetáculo em que ela vai cantar mas não vai ser ouvida; o sonovac de Mangon estará lá para apagar qualquer vestígio de som sem que ela dê conta. Mas, à última hora, Mangon resolve destruir o seu sonovac e ela acaba por cantar... mal, muito mal, fazendo toda a gente sair da sala. A questão central a analisar é a da memória do som. Nesta ficção de Ballard há elementos interessantes que nos ajudam a refletir sobre esse tema. Parte-se da ficção de Ballard e lançam-se questões que estão bem presentes no universo real que habitamos. De certa forma, desenvolve-se também a questão de saber o que é que a ficção tem a ver com a realidade, sobretudo em termos de som e música.

Desempenho de um algoritmo backward-forward sweep de cálculo de fluxo de potência

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

New brooms sweep clean, a farce ...

Mode of access: Internet.

The pattern maker's assistant; embracing lathe work, branch work, ore work, sweep work, and practical gear construction; the preparation and use of tools; together with a large collection of useful and valuable tables.

Mode of access: Internet.

The pattern maker's assistant; embracing lathe work, branch work, core work, sweep work, and practical gear construction; the preparation and use of tools; together with a large collection of useful and valuable tables.

Mode of access: Internet.

Organizational, direct support and general support maintenance repair parts and special tools list including depot maintenance repair parts and special tools for sweep generator assembly 4935-00-106-9684, improved Nike Hercules Air Defense Guided Missile System.

Includes index.

Operator and organizational maintenance manual including repair parts and special tools lists : generator, signal sweep AN/USM-203, (NSN 6625-00-935-0145).

"January 1969."

Organizational, direct support, and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools) for sweep generator SG-677A/U (NSN 6625-01-074-4337).

Includes index.

Monetary models of exchange rates and sweep programs

Numerous studies find that monetary models of exchange rates cannot beat a random walk model. Such a finding, however, is not surprising given that such models are built upon money demand functions and traditional money demand functions appear to have broken down in many developed countries. In this article, we investigate whether using a more stable underlying money demand function results in improvements in forecasts of monetary models of exchange rates. More specifically, we use a sweep-adjusted measure of US monetary aggregate M1 which has been shown to have a more stable money demand function than the official M1 measure. The results suggest that the monetary models of exchange rates contain information about future movements of exchange rates, but the success of such models depends on the stability of money demand functions and the specifications of the models.