Injecting, Controlling, and Storing Magnetic Domain Walls in Ferromagnetic Nanowires

Domain walls in ferromagnetic nanowires are important for proposed devices in recording, logic, and sensing. The realization of such devices depends in part on the ability to quickly and accurately control the domain wall from creation until placement. Using micromagnetic computer simulation we demonstrate how a combination of externally applied magnetic fields is used to quickly inject, move, and accurately place multiple domain walls within a single wire for potential recording and logical operations. The use of a magnetic field component applied perpendicular to the principle domain wall driving field is found to be critical for increased speed and reliability. The effects of the transverse field on the injection and trapping of the domain wall will be shown to be of particular importance

Controlling Individual Domain Walls in Ferromagnetic Nanowires for Memory and Sensor Applications

Controlled motion of 180o and 360o domain walls along planar nanowires is presented. Standard Landau – Lifshitz micromagnetic modeling has been used to simulate the response of the domain walls to the application of an external magnetic field. A 180o wall is quickly and easily moved with the application of an applied. field along the axis of the wire but a 360odomain wall is stationary in the same case. An oscillatory applied field can be used to continually move the wall along the wires axis. The speed at which the 360o domain wall is found to be several times slower than a similar 180o domain wall and is limited by interaction between the magnetization of the domain wall and the external field

Hybrid solutions to the feature interaction problem

In this paper we assume a competitive marketplace where the features are developed by different enterprises, which cannot or will not exchange information. We present a classification of feature interaction in this setting and introduce an on-line technique which serves as a basis for the two novel <i>hybrid</i> approaches presented. The approaches are hybrid as they are neither strictly off-line nor on-line, but combine aspects of both. The two approaches address different kinds of feature interactions, and thus are complimentary. Together they provide a complete solution by addressing interaction detection and resolution. We illustrate the techniques within the communication networks domain

Electrostatic protection of the Solar Power Satellite and rectenna

Several features of the interactions of the solar power satellite (SPS) with its space environment were examined theoretically. The voltages produced at various surfaces due to space plasmas and the plasma leakage currents through the kapton and sapphire solar cell blankets were calculated. At geosynchronous orbit, this parasitic power loss is only 0.7%, and is easily compensated by oversizing. At low-Earth orbit, the power loss is potentially much larger (3%), and anomalous arcing is expected for the EOTV high voltage negative surfaces. Preliminary results of a three dimensional self-consistent plasma and electric field computer program are presented, confirming the validity of the predictions made from the one dimensional models. Magnetic shielding of the satellite, to reduce the power drain and to protect the solar cells from energetic electron and plasma ion bombardment is considered. It is concluded that minor modifications can allow the SPS to operate safely and efficiently in its space environment. The SPS design employed in this study is the 1978 MSFC baseline design utilizing GaAs solar cells at CR-2 and an aluminum structure

Incidence of Huanglongbing on several sweet orange cultivars budded onto different rootstocks at the Citrus Experimental Station (EECB), Bebedouro, São Paulo, Brazil.

Huanglongbing (HLB), caused by Candidatus Liberibacter asiaticus and Ca. L. americanus and vectored by Diaphorina citri Kuwayama, was first reported in 2004 in Brazil and it is currently widespread in São Paulo State (Belasque et al., 2010). The EECB, in partnership with Embrapa Cassava & Fruits, conducts a citrus improvement program aimed to select scion and rootstock Citrus cultivars mainly focused on the resistance or tolerance to biotic and abiotic stresses

What If a State Required Civic Learning for All Students?

his article tells the story of the first state in the U.S. to set the expectation that every undergraduate in public higher education would be involved in civic learning. In 2012, the Massachusetts Board of Higher Education made “Preparing Citizens” one of seven key outcomes of its Vision Project for public higher education. In 2014, the Board passed a Policy on Civic Learning defining civic learning as “acquisition of the knowledge, the intellectual skills and the applied competencies that citizens need for informed and effective participation in civic and democratic life; it also means acquiring an understanding of the social values that underlie democratic structures and practices” (http://www.mass.edu/bhe/lib/documents/AAC14-48CivicLearningwithPolicy-RevisedFinalforBHE.pdf). First steps toward achieving this goal includedesigning a process to identify and designate on every campus under the Board’s oversight those courses with a substantial focus on civic learning—either with or without civic engagement built into them—anddeveloping a set of rubrics that can be used to assess student learning outcomes in these courses. The article presents the complex issues emerging through the first year’s work on these two steps, and sketches action steps to follow

MeV magnetosheath ions energized at the bow shock

A causal relationship between midlatitude magnetosheath energetic ions and bow shock magnetic geometry was previously established for ion energy up to 200 keV e−1 for the May 4, 1998, storm event. This study demonstrates that magnetosheath ions with energies above 200 keV up to 1 MeV simply extend the ion spectrum to form a power law tail. Results of cross-correlation analysis suggest that these ions also come directly from the quasi-parallel bow shock, not the magnetosphere. This is confirmed by a comparison of energetic ion fluxes simultaneously measured in the magnetosheath and at the quasi-parallel bow shock when both regions are likely connected by the magnetic field lines. We suggest that ions are accelerated at the quasi-parallel bow shock to energies as high as 1 MeV and subsequently transported into the magnetosheath during this event

Ohio Residency Law for Student Voters - Its Implications and a Proposal for More Effective Implementation of Residency Statutes

The task is to evaluate the traditional common law tests of domicile, many of which are outmoded, and to select those which are compatible with the new constitutional requirements of real fairness and equality in order to lay a firm foundation for the accomplishment of the original purposes of residency law in the modern world. Furthermore, the theoretical problems involved -constitutional exposition, common law analysis, statutory construction, and governmental policy- need to be synthesized into a system that is easily implemented by the Secretary of State, easily applied by local boards of election, and finally, easily understood by all new registrants for voting in Ohio. This article seeks to solve these problems in the soundest possible manner as a guide to the future and proposes a method of implementing them for boards of election and the general public

Dynamic masses for the close PG1159 binary SDSSJ212531.92-010745.9

SDSSJ212531.92-010745.9 is the first known PG1159 star in a close binary with a late main sequence companion allowing a dynamical mass determination. The system shows flux variations with a peak-to-peak amplitude of about 0.7 mag and a period of about 6.96h. In August 2007, 13 spectra of SDSSJ212531.92-010745.9 covering the full orbital phase range were taken at the TWIN 3.5m telescope at the Calar Alto Observatory (Alm\'{e}ria, Spain). These confirm the typical PG1159 features seen in the SDSS discovery spectrum, together with the Balmer series of hydrogen in emission (plus other emission lines), interpreted as signature of the companion's irradiated side. A radial velocity curve was obtained for both components. Using co-added radial-velocity-corrected spectra, the spectral analysis of the PG1159 star is being refined. The system's lightcurve, obtained during three seasons of photometry with the G\"ottingen 50cm and T\"ubingen 80cm telescopes, was fitted with both the NIGHTFALL and PHOEBE binary simulation programs. An accurate mass determination of the PG1159 component from the radial velocity measurements requires to first derive the inclination, which requires light curve modelling and yields further constraints on radii, effective temperature and separation of the system's components. From the analysis of all data available so far, we present the possible mass range for the PG1159 component of SDSSJ212531.92-010745.9.Comment: 8 pages, in "White dwarfs", proceedings of the 16th European White Dwarf Workshop, eds. E. Garcia-Berro, M. Hernanz, J. Isern, S. Torres, to be published in J. Phys.: Conf. Se

User preference evaluations of different configurations of an electronic horizontal situation indicator

LD2668 .R4 PSYH 1988 R44Master of SciencePsychological Science