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Nomenclatura Unesco > (22) Física > (2203) Electrónica
(2203.01) Circuitos (2203.02) Elementos de circuitos
(2203.03) Válvulas electrónicas (2203.04) Microscopía electrónica
(2203.05) Estados electrónicos (2203.06) Transporte de electrones
(2203.07) Circuitos integrados (2203.08) Fotoelectricidad
(2203.09) Piezoelectricidad (2203.99) Otras (especificar)

Categorías relacionadas:
(3307) Tecnología electrónica

Mostrando recursos 1 - 20 de 254,363

1. An Evaluation of Off-Label Use of Recombinant Activated Human Factor VII (NovoSeven) Patient Characteristics, Utilization Trends, and Outcomes From an Electronic Database of U.S. Academic Health Centers - Ra Magnetti; Michael Oinonen; Karl A. Matuszewski
Recombinant activated coagulation factor VII (rFVIIa) is a hemostatic agent developed by Novo Nordisk Pharmaceuti-cals, Inc., under the trademark NovoSeven. It is a recombinant DNA preparation of a naturally occurring protease, activated

2. A Conceptual Framework for Electronic Mentoring for People with Special Needs (Poster) - Carmit-noa Shpigelman; Patrice L. (tamar Weiss; Shunit Reiter
Recently, a growing number of electronic mentoring (e-mentoring) websites have become available to provide vocational and career support. E-mentoring, which refers to a mentoring relationship conducted via Computer-Mediated Communication (CMC), appears to be an accessible alternative for people with special needs. To date, few researchers have addressed the phenomenon of e-mentoring from a socio-emotional perspective for people with special needs (McDonald, Balcazar, & Keys, 2005; Miller & Griffiths, 2005). In response to this challenge, we conducted a pilot study which explored the feasibility and relevance implications of computer-mediated support (CMS) for youth with special needs (Shpigelman, Reiter, & Weiss, 2008)....

3. and - Paula M. C. Swatman; Paul A. Swatman
The growing importance of Electronic Data Interchange for the rapid transmission of intra- and inter-organisational communications is becoming recognised by nearly all sectors of industry. EDI itself is little more than a faster mail service. It is EDI's capacity for integration with internal application systems and organisational functions which separates EDI from other forms of electronic telecommunications- and makes EDI a truly strategic application, offering comparative advantage at the organisational, national and even international levels. This paper discusses the results of a series of case studies of Australian organisations involved with EDI, which was undertaken to determine whether integration with...

4. ANALYSIS AND DESIGN OF BAND-SPLIT AUDIO SCRAMBLER - I. A. Ali; M. J. Alawi
In this paper, the Analysis and Design of Electronic Band-Split Audio Scrambler is presented. The paper first presents a model of the Scrambler under consideration. An analytic formula for the Signal-to-Distortion Ratio due to non-ideal filtering is derived. The resulting formula could be used to evaluate the performance of the Audio Scrambler and/or design the filter under consideration. Numerical examples for a bandpass Butterworth filter as well as Chebyshev filter are given to illustrate the significance of the results. The effect of both the filter order and the number of frequency bands used on the system performance is also studied....

5. e-Text Watermarking: Utilizing 'Kashida' Extensions in Arabic Language Electronic Writing - Adnan Abdul-aziz Gutub; Fahd Al-haidari
Abstract — Digital watermarking is the process of embedding information into a digital signal. This work targets web applications that need to have hidden secure data within their Arabic e-text files. Many related watermarking techniques have been proposed as for text watermarking. However, most of them are suitable for English and cannot be generalized for different other languages such as Arabic. Arabic e-text watermarking is found having unique characteristics features that can be considered interestingly. In this paper, we are utilizing the extension Arabic character ‘Kashida ’ to propose an improved method for Arabic e-text watermarking. We utilize all the...

6. Acknowledgments - Marie Cosgrove-davies; Lauren Goodfriend
us excellent advice; Ed Jaoudi, for buying electronic equipment for us and never getting frustrated; Grant “Smitty ” Smith, Doug Judy, Don Reynolds, and Steve Palmer, for helping with chamber construction; Holly Castleman, for just being generally awesome; and Anson Stewart, Carl Shapiro, and Travis Rothbloom, for running E14 tests of the properties of our dessicant.

7. On the New Design of CFA based Voltage Controlled Integrator / Differentiator Suitable for Analog Signal Processing - R. K. Nagaria
Abstract:- Some new active Voltage Controlled RC integrator and differentiator circuit realizations, with both single and differential input capabilities, using a few passive components and a current feedback amplifier (CFA) device, are proposed. A multiplier (ICL- 8013) element has been appropriately utilized in the feed forward / feedback connection to obtain electronic tuning of the time constant (τo) by the d.c. control voltage (Vc) of the multiplier. Experimental result on wave processing had been verified in the frequency range of 50 KHz ∼ 300 KHz. The active τo sensitivities in the event of non-ideal CFA are shown to be extremely...

8. STUDY OF THE ELECTRONIC STRUCTURE OF CE-BASED HEAVY-FERMION SYSTEMS EXPOSED TO THE LOW-ENERGY NEUTRINO DENSE FLUX - V. A. Trapeznikov; I. N. Shabanova; A. V. Murin
The class of compounds based on f-elements (Ce) attracts great attention because of their unusual properties. They are characterized by a heavy-fermion state, which occurs in them under certain external actions. Heavy-fermion materials have unique properties. The objective of the work is the investigation of a change in the electronic structure in a number of Ce-based systems under the action of a dense neutrino flux in order to develop the technology for the essential change of material properties. To increase the density of the neutrino flux by several orders of magnitude, the phenomenon of diffraction is used. The investigation of...

9. Early cortical specializ in
so lw hoo on artm ng B so ptio ld i d i pon (ex to p vea cor its al a e p fro mm 2007). recogn inform the ad shown called t percep Frith unders to read examin in soci active b ment, ention shima re not aze is only i et al. nd to pared, it has ves as l skills ed, an l, and signs functional magnetic resonance imaging (fMRI) studies with adults are (i) the posterior superior temporal sulcus Proc. R. Soc. B Electronic supplementary material is available at

10. Configuration interaction calculations of positronic atoms and ions - M. W. J. Bromley A; J. Mitroy A; G. G. Ryzhikh A
The configuration interaction (CI) method is one of the most commonly used methods for the calculation of the electronic structure of atoms. The standard CI method based on a linear combination of orthonormal orbitals centered on the nucleus has been adapted to the calculation of the structure of exotic atoms containing one or two electrons and a positron. Results of calculations on a number of systems, including positronium hydride (PsH), eCu; eLi; eBe; eCd and CuPs show both the strengths and limitations of the CI approach for positron binding

11. Sousveillance: Inventing and using wearable computing devices for data collection in surveillance environments - Steve Mann; Jason Nolan; Barry Wellman
This paper describes using wearable computing devices to perform "sousveillance" (inverse surveillance) as a counter to organizational surveillance. A variety of wearable computing devices generated different kinds of responses, and allowed for the collection of data in different situations. Visible sousveillance often evoked counter-performances by front-line surveillance workers. The juxtaposition of sousveillance with surveillance generates new kinds of information in a social surveillance situation. Sousveillance: New Methodologies These days, if you feel like somebody's watching you, you might be right. One year after the Sept 11 attacks, security experts and privacy advocates say there has been a surge in the...

12. 1 POWER QUALITY AND ENERGY LOSS REDUCTION IN POWER SYSTEMS - M. Al-dabbagh; H Askarian; Rana Abdul; Jabbar Khan
Abstract – The need for a high quality power supply has become an essential requirement in modern power systems. Utilities compete on certain parameters in marketing their energy to users. In this respect, power quality is an important issue in formulating the strategy for competitive energy market. This paper analyses the influence of continuously increasing non-linear loads such as PC’s and other power electronic devices on the supply mains. Harmonic signals due to non-linear loads are given. Based on the results presented in the paper, the effect of the harmonic currents on energy losses and the power supply mains and...

13. Session 2793 - Kevin Davis; Damon Miller; Frank Severance
This paper describes the use of an interactive web-based circuit demonstration system to provide a mid-semester superposition capstone experience for electrical circuit fundamentals lab students. The particular circuit to be interactively demonstrated is a simple electronic artificial neural network which is used to compute individual and class average grades in our Electrical and Computer Engineering 100 Fundamentals of Circuits course. This provides a simple example of analog computing using a summing circuit. The analog grade computer is more fully described in a 1999 ASEE North Central Section Spring Conference paper by two of the authors of this paper entitled: "Neural...

14. Elect. Comm. in Probab. 14 (2009), 31–35 ELECTRONIC COMMUNICATIONS in PROBABILITY UNIQUENESS OF THE MIXING MEASURE FOR A RANDOM WALK IN A RANDOM ENVIRONMENT ON THE POSITIVE INTEGERS - Maren Eckhoff
Consider a random walk in an irreducible random environment on the positive integers. We prove that the annealed law of the random walk determines uniquely the law of the random environment. An application to linearly edge-reinforced random walk is given. 1 Introduction and

15. iEconomic Assessment of Improving Nutritional Characteristics of Feed Grains - John P. Brennan
ii NSW Agriculture 2000 This publication is copyright. Except as permitted under the Copyright Act 1968, no part of the publication may be reproduced by any process, electronic or otherwise, without the specific written permission of the copyright owner. Neither may information be stored electronically in any way whatever without such permission. ISSN 1442-9764

16. 1 INDUSTRIAL SCALE DIE FILLING AND THE USE OF SHORT SHOTS TO UNDERSTAND THERMAL AND FLOW EFFECTS - Paul W. Cleary; Joseph Ha; Mahesh Prakash; Thang Nguyen
The geometric complexity and high fluid speeds involved in High Pressure Die Casting (HPDC) combine to give strongly three dimensional fluid flow with significant free surface fragmentation and splashing. A simulation method that has proved particularly suited to modelling HPDC is Smoothed Particle Hydrodynamics (SPH). Materials are approximated by particles that are free to move around rather than by fixed grids, enabling more accurate prediction of fluid flows involving complex free surface motion. Three practical industrial examples of SPH simulated HPDC flows are presented; aluminium casting of a differential cover (automotive), an electronic housing and zinc casting of a door...

17. Preparing a Electronic Submission in “Camera Ready " Format - Osman Saka
Abstract: The abstract should be clear, descriptive and no longer than 250 words. It should provide a brief introduction to the main theme. This should generally be followed by a statement regarding the methodology, a brief summary of results. The abstract should end with a comment on the significance of the results or a brief conclusion. Abstracts are written in 8pt Times italic. In MSWord set paragraph format of abstract to indentation left and right each of 1.5 cm.

18. Janus Nanostructures Based on Au-TiO2 Heterodimers and Their Photocatalytic Activity in the Oxidation of Methanol - Sulolit Pradhan; Debraj Ghosh; Shaowei Chen
ABSTRACT Au-TiO2 snowman-like heterodimer nanoparticles were prepared by a surface sol-gel process based on gold Janus nanoparticles whose surface-protecting monolayers consisted of a hemisphere of hydrophobic 1-hexanethiolates and the other of hydrophilic 2-(2-mercaptoethoxy)ethanol. Transmission electron microscopic measurements showed that the resulting TiO2 nano-particles (diameter 6 nm) exhibited well-defined lattice fringes that were consistent with the (101) diffraction planes of anatase TiO2. The heterodimer nanoparticles displayed apparent photoluminescence that was ascribed to electronic transitions involving trap states of TiO2 particles, and the photocatalytic activity was manifested by the oxidative conversion of methanol into formaldehyde, which was detected quantitatively by the Nash...

19. Wipfrag image based granulometry system - Norbert H. Maerz; Tom C. Palangio; John A. Franklin
ABSTRACT: Quick and accurate measurements of size distribution are essential to managing fragmented rock and other materials. WipFrag is an automated image based granulometry system that uses digital image analysis of rock photographs and video tape images to determine grain size distributions. WipFrag images can be digitized from fixed video cameras in the field, or using roving camcorders. Photographic images can be digitized from slides, prints or negatives, using a desktop copy stand. Digital images in a variety of formats, delivered on disk or over electronic networks, can be used. WipFrag uses powerful image analysis techniques to isolate the individual...

20. SINUSOIDAL OSCILLATOR – A NEW CONFIGURATION BASED ON CURRENT CONVEYOR - Neeta Pandey; Sajal K. Paul; Asok Bhattacharyya
A new sinusoidal oscillator configuration using two second generation current conveyors (CCIIs) is introduced which requires only two grounded capacitors and two resistors. The proposed structure enjoys independent frequency control through grounded resistor. The circuit is extended to electronic tunability regime by replacing CCIIs with second generation current controlled conveyors (CCCIIs). The frequency of oscillation of the later structure is electronically controllable by bias current of CCCIIs. The simulation results are illustrated to verify theory.

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