2,553 research outputs found
Effects of annealing and strain on La_{1-x}Ca_{x}MnO_{3} thin films: a new phase diagram in the ferromagnetic region
Oriented, single phase thin films of La_{1-x}Ca_{x}MnO_{3} have been
deposited onto (100)-oriented LaAlO_{3} (0.1<x<0.5) substrates using the Pulsed
Laser Deposition technique. While for some compositions the physical properties
(transport and magnetization) of the as-grown films are higher than the bulk
values, for other calcium contents the optimized properties are obtained only
after annealing under oxygen. These data can be partly explained by changes in
oxygen content, resulting in cationic vacancies and thus self-doping effects -
accompanying structural changes, may be the cause of properties beyond the
phase diagram. We propose a new phase diagram for
(La_{1-x}Ca_{x})_{1-y}\square_{y}MnO_{3} (0.1<x<0.5) thin films.Comment: 8 pages, 5 figures submitted to Applied Physics Letter
The effect of substrate induced strain on the charge-ordering transition in Nd_{0.5}Sr_{0.5}MnO_{3} thin films
We report the synthesis and characterization of Nd_{0.5}Sr_{0.5}MnO_{3} thin
films grown by the Pulsed Laser Deposition technique on 100 -oriented LaAlO_{3}
substrates. X-ray diffraction (XRD) studies show that the films are 101
-oriented, with a strained and quasi-relaxed component, the latter increasing
with film thickness. We observe that transport properties are strongly
dependent on the thickness of the films. Variable temperature XRD down to 100 K
suggests that this is caused by substrate induced strain on the films.Comment: 3 pages REVTeX, 4 figures included, submitted to AP
Models and Algorithms for Graph Watermarking
We introduce models and algorithmic foundations for graph watermarking. Our
frameworks include security definitions and proofs, as well as
characterizations when graph watermarking is algorithmically feasible, in spite
of the fact that the general problem is NP-complete by simple reductions from
the subgraph isomorphism or graph edit distance problems. In the digital
watermarking of many types of files, an implicit step in the recovery of a
watermark is the mapping of individual pieces of data, such as image pixels or
movie frames, from one object to another. In graphs, this step corresponds to
approximately matching vertices of one graph to another based on graph
invariants such as vertex degree. Our approach is based on characterizing the
feasibility of graph watermarking in terms of keygen, marking, and
identification functions defined over graph families with known distributions.
We demonstrate the strength of this approach with exemplary watermarking
schemes for two random graph models, the classic Erd\H{o}s-R\'{e}nyi model and
a random power-law graph model, both of which are used to model real-world
networks
A Model of Security Architecture on Private Cloud Using OpenStack
Cloud computing is current trend and it is the best solution of the spending excessive budgeting for many organizations IT setup. With Cloud Computing becoming more widely utilized, it is important for organizations to understand ways to maximize benefits and minimize risks of a move to the cloud also to carefully consider its operating expenses essentially. Since most of the organization already has traditional IT setup by investing huge amount which they don’t want to lose and also they like to have their IT setup to move into cloud model. The major share of the investment would be spent for having data center in any organization. The main objective of this paper “A MODEL OF SECURITY ARCHITECTURE ON PRIVATE CLOUD USING OPENSTACK” is to provide the model architecture to move the organization’s in-house data center to private cloud. Also this paper explains about the strategy for the migration from organization’s on-premises IT setup to private cloud. This architecture is also used the open- source cloud computing software, called “OpenStack” platform. This technology consists of a series of interrelated projects that control pools of processing, storage, and networking resources throughout a data center-which users manage through a web-based dashboard, command-line tools, or a Restful API.
DOI: 10.17762/ijritcc2321-8169.15023
Investigation of laser ablated ZnO thin films grown with Zn metal target: a structural study
High quality ZnO thin films were gown using the pulsed laser deposition
technique on (0001) AlO substrates in an oxidizing atmosphere, using a
Zn metallic target. We varied the growth conditions such as the deposition
temperature and the oxygen pressure. First, using a battery of techniques such
as x-rays diffraction, Rutherford Backscattering spectroscopy and atomic force
microscopy, we evaluated the structural quality, the stress and the degree of
epitaxy of the films. Second, the relations between the deposition conditions
and the structural properties, that are directly related to the nature of the
thin films, are discussed qualitatively. Finally, a number of issues on how to
get good-quality ZnO films are addressed.Comment: To be published in Jour. Appl. Phys. (15 August 2004
Impulsive noise removal from color images with morphological filtering
This paper deals with impulse noise removal from color images. The proposed
noise removal algorithm employs a novel approach with morphological filtering
for color image denoising; that is, detection of corrupted pixels and removal
of the detected noise by means of morphological filtering. With the help of
computer simulation we show that the proposed algorithm can effectively remove
impulse noise. The performance of the proposed algorithm is compared in terms
of image restoration metrics and processing speed with that of common
successful algorithms.Comment: The 6th international conference on analysis of images, social
networks, and texts (AIST 2017), 27-29 July, 2017, Moscow, Russi
Electrical generation of pure spin currents in a two-dimensional electron gas
Pure spin currents are measured in micron-wide channels of GaAs
two-dimensional electron gas (2DEG). Spins are injected and detected using
quantum point contacts, which become spin polarized at high magnetic field.
High sensitivity to the spin signal is achieved in a nonlocal measurement
geometry, which dramatically reduces spurious signals associated with charge
currents. Measured spin relaxation lengths range from 30 to 50 microns, much
longer than has been reported in GaAs 2DEG's. The technique developed here
provides a flexible tool for the study of spin polarization and spin dynamics
in mesoscopic structures defined in 2D semiconductor systems
UAS Service Supplier Specification
Within the Unmanned Aircraft Systems (UAS) Traffic Management (UTM) system, the UAS Service Supplier (USS) is a key component. The USS serves several functions. At a high level, those include the following: Bridging communication between UAS Operators and Flight Information Management System (FIMS) Supporting planning of UAS operations Assisting strategic deconfliction of the UTM airspace Providing information support to UAS Operators during operations Helping UAS Operators meet their formal requirements This document provides the minimum set of requirements for a USS. In order to be recognized as a USS within UTM, successful demonstration of satisfying the requirements described herein will be a prerequisite. To ensure various desired qualities (security, fairness, availability, efficiency, maintainability, etc.), this specification relies on references to existing public specifications whenever possible
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