Effects of impurity atoms on sputtered GMR multilayers

We have investigated the effects of residual gas impurity atoms on interlayer exchange coupling and giant magnetoresistance (GMR) in Co(9Ä)/Cu(9Ä) multilayers. Structural analysis was performed by Co(59) NMR. We deposited sub-monolayer quantities of residual gases at different points in the Co/Cu bilayer; the interfaces, or the middle of the Cu spacers or CO magnetic layers. Impurities at the interface lower the GMR and increase remenant fraction and saturation field. We are able to model these results phenomenologically by adding biquadratic coupling. Impurities in the bulk of the Cu layers lower GMR still further, and such samples are well described by models containing almost 100% biquadratic coupling. We have demonstrated that the ttansport parameters in our samples are largely unaffected by small quantities of impurities, but that the interlayer coupling is extremely sensitive to them, particularly in the bulk of the Cu spacer layers

Implemantasi Teknik Penyajian Object Surface Dengan Menggunakan Metode Revolution

Penggambaran obyek tiga dimensi pada layar komputer memerlukan beberapa teknik grafika diantaranya adalah teknik pembentukan obyek, penyusunan titik-titik obyyek dan proyeksi obyek 3 dimensi ke bidang 2 dimensi. terdapat beberapa macam metode pembentukan obyek salah satunya adalah dengan memanfaatkan metode surface of revolution. Pada tugas akhir ini dibahas pembentukan suatu surface menggunakan metode tersebut dengan tujuan membuuat editor grafik untuk membentuk suatu surface, pada metode surface of revolution, surface dibentuk dari hasil putar sebuah kurva disebut profile Profile adalah sebuah kurva tunggal yang dibentuk dari sejumlah segmen dengan titik-titok antar segmen yang disebut sebagai titik kontrol, letak dari titik kontrol inilah yang dapat diatur sehingga pemakai program dapat membentuk profile dan surface yang diinginka

Dificuldades em estudo de infecções respiratórias em comunidade no Uruguay

A cohort study on acute respiratory infections, involving 270 children observed by pediatricians in their homes every 10 days over a period of 32 months, gave the opportunity to experience logistic and methodological problems seldom described in the literature. The purpose of this article is to alert researchers as to the difficulties faced when performing community-based studies in developing countries. Although a carefully planned project was undertaken, problem areas included the establishment of the target population, population dynamics, field related problems, laboratory aspects and data management. It is hoped that other investigators may benefit from the extensive experience gained from our program in foreseeing and coping with the difficulties involved.Durante estudo sobre infecção respiratória aguda estudada numa coorte de 270 crianças observadas pelos pediatras, cada 10 dias, durante 32 meses, enfrentaram-se problemas metodológicos e logisticos, poucas vezes descritos na literatura. Considerou-se, portanto, importante alertar outros pesquisadores a respeito das dificuldades apresentadas quando se realiza estudo em nível cumunitário, em um país em desenvolvimento. Apesar do mencionado estudo ter sido planejado com minúcia, enfrentaram-se problemas relativos à população objeto do estudo, à dinâmica populacional, aos aspectos operacionais e ao tratamento da informação. Espera-se que outros pesquisadores possam beneficiar-se da experiência adquirida durante o citado estudo, a fim de evitar ou prever as dificuldades analisadas

Accidental Intracranial Hyperalimentation Infusion

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141658/1/jpen0532.pd

Light controlled magnetoresistance and magnetic field controlled photoresistance in CoFe film deposited on BiFeO3

We present a magnetoresistive-photoresistive device based on the interaction of a piezomagnetic CoFe thin film with a photostrictive BiFeO3 substrate that undergoes light-induced strain. The magnitude of the resistance and magnetoresistance in the CoFe film can be controlled by the wavelength of the incident light on the BiFeO3. Moreover, a light-induced decrease in anisotropic magnetoresistance is detected due to an additional magnetoelastic contribution to magnetic anisotropy of the CoFe film. This effect may find applications in photo-sensing systems, wavelength detectors and can possibly open a research development in light-controlled magnetic switching properties for next generation magnetoresistive memory devices.Comment: 5 pages, 4 figures, journal pape