WorldWideScience

Sample records for enabling universal frequency

  1. Insights into Attrition from University-Based Enabling Programs

    Science.gov (United States)

    Bookallil, Cheryl; Harreveld, Bobby

    2017-01-01

    High attrition rates from university-based enabling programs continue to be the subject of much research and administrative effort. Understanding the factors behind decisions to withdraw from such programs is difficult since those who do not successfully complete an enabling program may not readily agree to participate in research into their…

  2. A Universal Hurricane Frequency Function

    OpenAIRE

    Robert Ehrlich

    2010-01-01

    Evidence is provided that the global distribution of tropical hurricanes is principally determined by a universal function H of a single variable z that in turn is expressible in terms of the local sea surface temperature and latitude. The data-driven model presented here carries stark implications for the large increased numbers of hurricanes which it predicts for a warmer world. Moreover, the rise in recent decades in the numbers of hurricanes in the Atlantic, but not the Pacific basin, i...

  3. A Universal Hurricane Frequency Function

    OpenAIRE

    Ehrlich, Robert

    2010-01-01

    Evidence is provided that the global distribution of tropical hurricanes is principally determined by a universal function H of a single variable z that in turn is expressible in terms of the local sea surface temperature and latitude. The data-driven model presented here carries stark implications for the large increased numbers of hurricanes which it predicts for a warmer world. Moreover, the rise in recent decades in the numbers of hurricanes in the Atlantic, but not the Pacific basin, is ...

  4. Predicting fundamental frequency from mel-frequency cepstral coefficients to enable speech reconstruction

    Science.gov (United States)

    Shao, Xu; Milner, Ben

    2005-08-01

    This work proposes a method to reconstruct an acoustic speech signal solely from a stream of mel-frequency cepstral coefficients (MFCCs) as may be encountered in a distributed speech recognition (DSR) system. Previous methods for speech reconstruction have required, in addition to the MFCC vectors, fundamental frequency and voicing components. In this work the voicing classification and fundamental frequency are predicted from the MFCC vectors themselves using two maximum a posteriori (MAP) methods. The first method enables fundamental frequency prediction by modeling the joint density of MFCCs and fundamental frequency using a single Gaussian mixture model (GMM). The second scheme uses a set of hidden Markov models (HMMs) to link together a set of state-dependent GMMs, which enables a more localized modeling of the joint density of MFCCs and fundamental frequency. Experimental results on speaker-independent male and female speech show that accurate voicing classification and fundamental frequency prediction is attained when compared to hand-corrected reference fundamental frequency measurements. The use of the predicted fundamental frequency and voicing for speech reconstruction is shown to give very similar speech quality to that obtained using the reference fundamental frequency and voicing.

  5. A Universal Hurricane Frequency Function

    CERN Document Server

    Ehrlich, Robert

    2010-01-01

    Evidence is provided that the global distribution of tropical hurricanes is principally determined by a universal function H of a single variable z that in turn is expressible in terms of the local sea surface temperature and latitude. The data-driven model presented here carries stark implications for the large increased numbers of hurricanes which it predicts for a warmer world. Moreover, the rise in recent decades in the numbers of hurricanes in the Atlantic, but not the Pacific basin, is shown to have a simple explanation in terms of the specific form of H(z), which yields larger percentage increases when a fixed increase in sea surface temperature occurs at higher latitudes and lower temperatures.

  6. A Universal Hurricane Frequency Function

    Directory of Open Access Journals (Sweden)

    Robert Ehrlich

    2010-01-01

    Full Text Available Evidence is provided that the global distribution of tropical hurricanes is principally determined by a universal function H of a single variable z that in turn is expressible in terms of the local sea surface temperature and latitude. The data-driven model presented here carries stark implications for the large increased numbers of hurricanes which it predicts for a warmer world. Moreover, the rise in recent decades in the numbers of hurricanes in the Atlantic, but not the Pacific basin, is shown to have a simple explanation in terms of the specific form of H(z, which yields larger percentage increases when a fixed increase in sea surface temperature occurs at higher latitudes and lower temperatures.

  7. Radio frequency identification enabled wireless sensing for intelligent food logistics.

    Science.gov (United States)

    Zou, Zhuo; Chen, Qiang; Chen, Qing; Uysal, Ismail; Zheng, Lirong

    2014-06-13

    Future technologies and applications for the Internet of Things (IoT) will evolve the process of the food supply chain and create added value of business. Radio frequency identifications (RFIDs) and wireless sensor networks (WSNs) have been considered as the key technological enablers. Intelligent tags, powered by autonomous energy, are attached on objects, networked by short-range wireless links, allowing the physical parameters such as temperatures and humidities as well as the location information to seamlessly integrate with the enterprise information system over the Internet. In this paper, challenges, considerations and design examples are reviewed from system, implementation and application perspectives, particularly with focus on intelligent packaging and logistics for the fresh food tracking and monitoring service. An IoT platform with a two-layer network architecture is introduced consisting of an asymmetric tag-reader link (RFID layer) and an ad-hoc link between readers (WSN layer), which are further connected to the Internet via cellular or Wi-Fi. Then, we provide insights into the enabling technology of RFID with sensing capabilities. Passive, semi-passive and active RFID solutions are discussed. In particular, we describe ultra-wideband radio RFID which has been considered as one of the most promising techniques for ultra-low-power and low-cost wireless sensing. Finally, an example is provided in the form of an application in fresh food tracking services and corresponding field testing results.

  8. Open Content and Open Educational Resources: Enabling universal education

    Directory of Open Access Journals (Sweden)

    Tom Caswell

    2008-02-01

    Full Text Available The role of distance education is shifting. Traditionally distance education was limited in the number of people served because of production, reproduction, and distribution costs. Today, while it still costs the university time and money to produce a course, technology has made it such that reproduction costs are almost non-existent. This shift has significant implications, and allows distance educators to play an important role in the fulfillment of the promise of the right to universal education. At little or no cost, universities can make their content available to millions. This content has the potential to substantially improve the quality of life of learners around the world. New distance education technologies, such as OpenCourseWares, act as enablers to achieving the universal right to education. These technologies, and the associated changes in the cost of providing access to education, change distance education's role from one of classroom alternative to one of social transformer.

  9. Frequency of childhood abuse in university students

    Directory of Open Access Journals (Sweden)

    Cem Zeren

    2012-12-01

    Full Text Available Objectives: Child abuse or bad behaviors against childrenis a social, medical problem and is old as the historyof humanity. The analysis of the frequency of childhoodabuse in university students and the comparison of thefactors related with abuse were aimed in this study.Materials and methods: A questionnaire of social anddemographic features and Childhood Trauma Questionnairewhich is valid and reliable in Turkey were used inthis study.Results: The questionnaires were performed to 150students and 60 % of them were female. The mean agewas 19.04±1.28 (17-26 years. The emotional (p=0.025,physical (p=0.004 and sexual (p=0.001 abuse of malestudents were significantly higher than female students.The emotional (p=0.009 and total (p=0.026 abuse ofstudents who had families with lower income levels weresignificantly high. Also the frequency of emotional abusein students with divorced parents was significantly increased(p=0.012.Conclusions: Since child abuse and neglect may beassociated with the stresses of family life, the economicand social stresses of family should be determined andsolution advices to these should be developed. A multidisciplinarymanagement is required to detect, treat andrehabilitate the childhood abuse.Key words: Childhood, university student, sexual abuse

  10. Fin whale sound reception mechanisms: skull vibration enables low-frequency hearing.

    Directory of Open Access Journals (Sweden)

    Ted W Cranford

    Full Text Available Hearing mechanisms in baleen whales (Mysticeti are essentially unknown but their vocalization frequencies overlap with anthropogenic sound sources. Synthetic audiograms were generated for a fin whale by applying finite element modeling tools to X-ray computed tomography (CT scans. We CT scanned the head of a small fin whale (Balaenoptera physalus in a scanner designed for solid-fuel rocket motors. Our computer (finite element modeling toolkit allowed us to visualize what occurs when sounds interact with the anatomic geometry of the whale's head. Simulations reveal two mechanisms that excite both bony ear complexes, (1 the skull-vibration enabled bone conduction mechanism and (2 a pressure mechanism transmitted through soft tissues. Bone conduction is the predominant mechanism. The mass density of the bony ear complexes and their firmly embedded attachments to the skull are universal across the Mysticeti, suggesting that sound reception mechanisms are similar in all baleen whales. Interactions between incident sound waves and the skull cause deformations that induce motion in each bony ear complex, resulting in best hearing sensitivity for low-frequency sounds. This predominant low-frequency sensitivity has significant implications for assessing mysticete exposure levels to anthropogenic sounds. The din of man-made ocean noise has increased steadily over the past half century. Our results provide valuable data for U.S. regulatory agencies and concerned large-scale industrial users of the ocean environment. This study transforms our understanding of baleen whale hearing and provides a means to predict auditory sensitivity across a broad spectrum of sound frequencies.

  11. Fin whale sound reception mechanisms: skull vibration enables low-frequency hearing.

    Science.gov (United States)

    Cranford, Ted W; Krysl, Petr

    2015-01-01

    Hearing mechanisms in baleen whales (Mysticeti) are essentially unknown but their vocalization frequencies overlap with anthropogenic sound sources. Synthetic audiograms were generated for a fin whale by applying finite element modeling tools to X-ray computed tomography (CT) scans. We CT scanned the head of a small fin whale (Balaenoptera physalus) in a scanner designed for solid-fuel rocket motors. Our computer (finite element) modeling toolkit allowed us to visualize what occurs when sounds interact with the anatomic geometry of the whale's head. Simulations reveal two mechanisms that excite both bony ear complexes, (1) the skull-vibration enabled bone conduction mechanism and (2) a pressure mechanism transmitted through soft tissues. Bone conduction is the predominant mechanism. The mass density of the bony ear complexes and their firmly embedded attachments to the skull are universal across the Mysticeti, suggesting that sound reception mechanisms are similar in all baleen whales. Interactions between incident sound waves and the skull cause deformations that induce motion in each bony ear complex, resulting in best hearing sensitivity for low-frequency sounds. This predominant low-frequency sensitivity has significant implications for assessing mysticete exposure levels to anthropogenic sounds. The din of man-made ocean noise has increased steadily over the past half century. Our results provide valuable data for U.S. regulatory agencies and concerned large-scale industrial users of the ocean environment. This study transforms our understanding of baleen whale hearing and provides a means to predict auditory sensitivity across a broad spectrum of sound frequencies.

  12. Fin Whale Sound Reception Mechanisms: Skull Vibration Enables Low-Frequency Hearing

    Science.gov (United States)

    Cranford, Ted W.; Krysl, Petr

    2015-01-01

    Hearing mechanisms in baleen whales (Mysticeti) are essentially unknown but their vocalization frequencies overlap with anthropogenic sound sources. Synthetic audiograms were generated for a fin whale by applying finite element modeling tools to X-ray computed tomography (CT) scans. We CT scanned the head of a small fin whale (Balaenoptera physalus) in a scanner designed for solid-fuel rocket motors. Our computer (finite element) modeling toolkit allowed us to visualize what occurs when sounds interact with the anatomic geometry of the whale’s head. Simulations reveal two mechanisms that excite both bony ear complexes, (1) the skull-vibration enabled bone conduction mechanism and (2) a pressure mechanism transmitted through soft tissues. Bone conduction is the predominant mechanism. The mass density of the bony ear complexes and their firmly embedded attachments to the skull are universal across the Mysticeti, suggesting that sound reception mechanisms are similar in all baleen whales. Interactions between incident sound waves and the skull cause deformations that induce motion in each bony ear complex, resulting in best hearing sensitivity for low-frequency sounds. This predominant low-frequency sensitivity has significant implications for assessing mysticete exposure levels to anthropogenic sounds. The din of man-made ocean noise has increased steadily over the past half century. Our results provide valuable data for U.S. regulatory agencies and concerned large-scale industrial users of the ocean environment. This study transforms our understanding of baleen whale hearing and provides a means to predict auditory sensitivity across a broad spectrum of sound frequencies. PMID:25633412

  13. Enablers and barriers to multilingualism in South African university ...

    African Journals Online (AJOL)

    Lines of thinking that emerge include: significance of academic literacy and how it underpins university studies; and separatist solutions where academic literacy is taught in dedicated modules. However the uncertain academic status of African language studies and negative attitudes to its speakers may compromise the ...

  14. Enabling University Satellites to Travel to the Moon and Beyond

    Science.gov (United States)

    Siy, Grace; Branam, Richard

    2017-11-01

    Electric propulsion is a method of creating thrust for space exploration that requires less propellant than traditional chemical rockets by producing much higher exhaust velocities, and subsequently costing less. Currently, such forms of propulsion are unable to generate the vast amounts of thrust that traditional thrusters do, thus research is being done in the area. The focus of this project is Hall Effect thrusters, a specific type of ion propulsion. The distinctive feature of these thrusters are magnets which capture the electrons from the cathode. These electrons ionize the propellant gas and then interact with the present electric field to accelerate the resulting ions, generating thrust. The objectives of this project include building two Hall thrusters with different magnet configurations, collecting performance data, and testing with a Faraday probe that directly measures current density. The first magnet configuration will be a conventional Hall Effect thruster arrangement, while the second thruster's magnets are arranged to create a significantly stronger magnetic field. The performance data and Faraday probe results will be used to determine the level of improvement between the thrusters. The goal is to integrate a Hall Effect propulsion system into the university's Cube-Sat program. Special Acknowledgement of the REU Site: Fluid Mechanics with Analysis using Computations and Experiments (FM-ACE) EEC 1659710.

  15. frequency of delusional halitosis in a university community

    African Journals Online (AJOL)

    Dr. E. P. Gharoro

    ABSTRACT. Objective: This study reviewed the prevalence of delusional halitosis and analyzed the frequency of this condition within the University. Community, over a period of three years. Method: Sixty-eight (68) patients with delusional halitosis were diagnosed over a period of three years (2001 to. 2003), at the Dental ...

  16. Integrating Technology into Instruction at a Public University in Kyrgyzstan: Barriers and Enablers

    Science.gov (United States)

    Muhametjanova, Gulshat; Cagiltay, Kursat

    2016-01-01

    The purpose of this study was to determine enablers and barriers to the technology integration into education based on the example of the situation at the Kyrgyz-Turkish Manas University as reported by students and instructors. The study employed the mixed-methods research design, combining data obtained from 477 student and 57 instructor…

  17. ICT enabled classroom effectiveness scale development and validation: A case of multi-campus university

    Directory of Open Access Journals (Sweden)

    Jyoti Tikoria

    2017-03-01

    Full Text Available The research work aims at developing a valid and reliable scale for ICT (Information and communication technology enabled classroom effectiveness from student’s perspective in a multi-campus university setting. A standard methodology for scale development is used for developing and validating the scale which comprises of exploratory and confirmatory factor analysis. The sample population was the students from a premier multi-campus university. The results revealed ICT enabled classroom effectiveness as a multi-dimensional construct comprising of four factors namely class design and infrastructure; scheduling and coordination; technical support staff; and resource availability. Although a plethora of literature is available in the domain of e-learning, none of them have considered the aspects of ICT enabled classroom effectiveness specifically in an Indian multi-campus university. The limitation of the study lies in terms of sample size and generalizability. Emphasizing the identified factors will give a cutting edge advantage for the universities by enhancing the effectiveness and efficiency of ICT enabled classroom teaching.

  18. Knowledge Management Practices and Enablers in Public Universities: A Gap Analysis

    Science.gov (United States)

    Ramachandran, Sharimllah Devi; Chong, Siong-Choy; Wong, Kuan-Yew

    2013-01-01

    Purpose: The purpose of this paper is to examine the gap between knowledge management (KM) practices and key strategic enablers in public universities. For this purpose, a 57-item survey on two dimensions--"use" and "importance"--was used as the instrument for this study. Design/methodology/approach: The questionnaire was…

  19. Status of ICT-enabled library and information services in university ...

    African Journals Online (AJOL)

    This paper aim ed at ascertaining the status of the ICT -enabled library and information services in University of Nigeria, Nsukka Library System. The study employed a case study design. Questionnaire was the main instrument for data collection and it was used to gather data from fifteen (15) library officers and Fifty (50) ...

  20. Role of communication content and frequency in enabling evidence-based practices.

    Science.gov (United States)

    Rangachari, Pavani; Madaio, Michael; Rethemeyer, R Karl; Wagner, Peggy; Hall, Lauren; Roy, Siddharth; Rissing, Peter

    2014-01-01

    Many hospitals are unable to successfully implement evidence-based practices. For example, implementation of the central line bundle (CLB), proven to prevent catheter-related bloodstream infections (CRBSIs), is often challenging. This problem is broadly characterized as a "change implementation failure." A prospective study was conducted in 2 intensive care units (ICUs), a medical ICU (MICU) and a pediatric ICU (PICU), within an academic health center. Both units had low baseline adherence to CLB and higher-than-expected CRBSIs. The study sought to promote CLB implementation in both units through periodic quality improvement (QI) interventions over a 52-week period. Simultaneously, it examined (1) the content and frequency of communication related to CLB through weekly "communication logs" completed by physicians, nurses, and managers, and (2) outcomes, that is, CLB adherence rates through weekly medical record reviews. The aim of the study was 2-fold: (1) to examine associations between QI interventions and communication content and frequency at the unit level, and (2) to examine associations between communication content and frequency and outcomes at the unit level. The periodic QI interventions were expected to increase CLB adherence and reduce CRBSIs through their influence on communication content and frequency. A total of 2638 instances of communication were analyzed. Both units demonstrated a statistically significant increase in "proactive" communications-that is, communication intended to reduce infection risk between physicians and nurses over time. Proactive communications increased by 68% in the MICU (P declines in (1) catheter days: 34% decline in the MICU (P decline in the MICU (P communication dynamics and enabling practice change. The prospective design provides insights into communication content and frequency associated with collective learning and culture change. The study identifies evidence-based management strategies for positive practice

  1. Frequency-Dependent Multi-Well Cardiotoxicity Screening Enabled by Optogenetic Stimulation

    Directory of Open Access Journals (Sweden)

    Susanne Rehnelt

    2017-12-01

    Full Text Available Side effects on cardiac ion channels causing lethal arrhythmias are one major reason for drug withdrawals from the market. Field potential (FP recording from cardiomyocytes, is a well-suited tool to assess such cardiotoxic effects of drug candidates in preclinical drug development, but it is currently limited to the spontaneous beating of the cardiomyocytes and manual analysis. Herein, we present a novel optogenetic cardiotoxicity screening system suited for the parallel automated frequency-dependent analysis of drug effects on FP recorded from human-induced pluripotent stem cell-derived cardiomyocytes. For the expression of the light-sensitive cation channel Channelrhodopsin-2, we optimised protocols using virus transduction or transient mRNA transfection. Optical stimulation was performed with a new light-emitting diode lid for a 96-well FP recording system. This enabled reliable pacing at physiologically relevant heart rates and robust recording of FP. Thereby we detected rate-dependent effects of drugs on Na+, Ca2+ and K+ channel function indicated by FP prolongation, FP shortening and the slowing of the FP downstroke component, as well as generation of afterdepolarisations. Taken together, we present a scalable approach for preclinical frequency-dependent screening of drug effects on cardiac electrophysiology. Importantly, we show that the recording and analysis can be fully automated and the technology is readily available using commercial products.

  2. Universal distribution of component frequencies in biological and technological systems.

    Science.gov (United States)

    Pang, Tin Yau; Maslov, Sergei

    2013-04-09

    Bacterial genomes and large-scale computer software projects both consist of a large number of components (genes or software packages) connected via a network of mutual dependencies. Components can be easily added or removed from individual systems, and their use frequencies vary over many orders of magnitude. We study this frequency distribution in genomes of ∼500 bacterial species and in over 2 million Linux computers and find that in both cases it is described by the same scale-free power-law distribution with an additional peak near the tail of the distribution corresponding to nearly universal components. We argue that the existence of a power law distribution of frequencies of components is a general property of any modular system with a multilayered dependency network. We demonstrate that the frequency of a component is positively correlated with its dependency degree given by the total number of upstream components whose operation directly or indirectly depends on the selected component. The observed frequency/dependency degree distributions are reproduced in a simple mathematically tractable model introduced and analyzed in this study.

  3. Simple and robust referencing system enables identification of dissolved-phase xenon spectral frequencies.

    Science.gov (United States)

    Antonacci, Michael A; Zhang, Le; Burant, Alex; McCallister, Drew; Branca, Rosa T

    2017-12-19

    To assess the effect of macroscopic susceptibility gradients on the gas-phase referenced dissolved-phase 129 Xe (DPXe) chemical shift (CS) and to establish the robustness of a water-based referencing system for in vivo DPXe spectra. Frequency shifts induced by spatially varying magnetic susceptibility are calculated by finite-element analysis for the human head and chest. Their effect on traditional gas-phase referenced DPXe CS is then assessed theoretically and experimentally. A water-based referencing system for the DPXe resonances that uses the local water protons as reference is proposed and demonstrated in vivo in rats. Across the human brain, macroscopic susceptibility gradients can induce an apparent variation in the DPXe CS of up to 2.5 ppm. An additional frequency shift as large as 6.5 ppm can exist between DPXe and gas-phase resonances. By using nearby water protons as reference for the DPXe CS, the effect of macroscopic susceptibility gradients is eliminated and consistent CS values are obtained in vivo, regardless of shimming conditions, region of interest analyzed, animal orientation, or lung inflation. Combining in vitro and in vivo spectroscopic measurements finally enables confident assignment of some of the DPXe peaks observed in vivo. To use hyperpolarized xenon as a biological probe in tissues, the DPXe CS in specific organs/tissues must be reliably measured. When the gas-phase is used as reference, variable CS values are obtained for DPXe resonances. Reliable peak assignments in DPXe spectra can be obtained by using local water protons as reference. Magn Reson Med, 2017. © 2017 International Society for Magnetic Resonance in Medicine. © 2017 International Society for Magnetic Resonance in Medicine.

  4. Spatial transformation-enabled electromagnetic devices: from radio frequencies to optical wavelengths.

    Science.gov (United States)

    Jiang, Zhi Hao; Turpin, Jeremy P; Morgan, Kennith; Lu, Bingqian; Werner, Douglas H

    2015-08-28

    Transformation optics provides scientists and engineers with a new powerful design paradigm to manipulate the flow of electromagnetic waves in a user-defined manner and with unprecedented flexibility, by controlling the spatial distribution of the electromagnetic properties of a medium. Using this approach, over the past decade, various previously undiscovered physical wave phenomena have been revealed and novel electromagnetic devices have been demonstrated throughout the electromagnetic spectrum. In this paper, we present versatile theoretical and experimental investigations on designing transformation optics-enabled devices for shaping electromagnetic wave radiation and guidance, at both radio frequencies and optical wavelengths. Different from conventional coordinate transformations, more advanced and versatile coordinate transformations are exploited here to benefit diverse applications, thereby providing expanded design flexibility, enhanced device performance, as well as reduced implementation complexity. These design examples demonstrate the comprehensive capability of transformation optics in controlling electromagnetic waves, while the associated novel devices will open up new paths towards future integrated electromagnetic component synthesis and design, from microwave to optical spectral regimes. © 2015 The Author(s) Published by the Royal Society. All rights reserved.

  5. Seeking the Passionate Career: First-in-Family Enabling Students and the Idea of the Australian University

    Science.gov (United States)

    May, Josephine; Delahunty, Janine; O'Shea, Sarah; Stone, Cathy

    2016-01-01

    This paper examines the idea of the university from the first-in-family enabling students' perspective. It provides an overview of the current crisis of meaning in scholarly commentary that points to a spectrum of meanings about the university. This spectrum ranges from the ancient imaginary of the monastic university as "ivory tower" to…

  6. Parallels and problems of normalization in rehabilitation and universal design: enabling connectivities.

    Science.gov (United States)

    Gibson, Barbara E

    2014-01-01

    Universal design (UD) is oriented to creating products, buildings, outdoor spaces and services for use by all people to the fullest extent possible according to principles of enabling equal citizenship. Nevertheless its theoretical basis has been under-explored, a critique that has also been leveled at rehabilitation. This commentary explores parallels between UD and dominant rehabilitation discourses that risk privileging or discrediting particular ways of being and doing. Commentary. Drawing from examples that explore the intersection of bodies, places and technologies with disabled people, I examined how practices of normalization risk reproducing the universalized body and legitimated forms of mobility, and in so doing perpetuates the "othering" of difference. To address these limitations, I explored the postmodern notion of multiple creative "assemblages" that are continually made and broken over time and space. Assemblages resist normalization tendencies by acknowledging and fostering multiple productive dependencies between human and non-human elements that include diverse bodies, not just those labeled disabled. In exploring the potential of enhancing creative assemblages and multiple dependencies, space opens up in UD and rehabilitation for acknowledging, developing, and promoting a multiplicity of bodily forms and modes of mobility. Implications for Rehabilitation Universal design and rehabilitation both risk perpetuating particular ideas about what disabled people should be, do, and value, that privilege a limited range of particular bodily forms. The notion of "assemblages" provides a conceptual tool for rethinking negative views of dependence and taken for granted independence goals. In exploring the potential of enhancing various dependencies, space opens up for reconsidering disability, mobility and multiple ways of "doing-in-the-world".

  7. Input-dependent frequency modulation of cortical gamma oscillations shapes spatial synchronization and enables phase coding.

    Science.gov (United States)

    Lowet, Eric; Roberts, Mark; Hadjipapas, Avgis; Peter, Alina; van der Eerden, Jan; De Weerd, Peter

    2015-02-01

    Fine-scale temporal organization of cortical activity in the gamma range (∼25-80Hz) may play a significant role in information processing, for example by neural grouping ('binding') and phase coding. Recent experimental studies have shown that the precise frequency of gamma oscillations varies with input drive (e.g. visual contrast) and that it can differ among nearby cortical locations. This has challenged theories assuming widespread gamma synchronization at a fixed common frequency. In the present study, we investigated which principles govern gamma synchronization in the presence of input-dependent frequency modulations and whether they are detrimental for meaningful input-dependent gamma-mediated temporal organization. To this aim, we constructed a biophysically realistic excitatory-inhibitory network able to express different oscillation frequencies at nearby spatial locations. Similarly to cortical networks, the model was topographically organized with spatially local connectivity and spatially-varying input drive. We analyzed gamma synchronization with respect to phase-locking, phase-relations and frequency differences, and quantified the stimulus-related information represented by gamma phase and frequency. By stepwise simplification of our models, we found that the gamma-mediated temporal organization could be reduced to basic synchronization principles of weakly coupled oscillators, where input drive determines the intrinsic (natural) frequency of oscillators. The gamma phase-locking, the precise phase relation and the emergent (measurable) frequencies were determined by two principal factors: the detuning (intrinsic frequency difference, i.e. local input difference) and the coupling strength. In addition to frequency coding, gamma phase contained complementary stimulus information. Crucially, the phase code reflected input differences, but not the absolute input level. This property of relative input-to-phase conversion, contrasting with latency codes

  8. Input-Dependent Frequency Modulation of Cortical Gamma Oscillations Shapes Spatial Synchronization and Enables Phase Coding

    Science.gov (United States)

    Lowet, Eric; Roberts, Mark; Hadjipapas, Avgis; Peter, Alina; van der Eerden, Jan; De Weerd, Peter

    2015-01-01

    Fine-scale temporal organization of cortical activity in the gamma range (∼25–80Hz) may play a significant role in information processing, for example by neural grouping (‘binding’) and phase coding. Recent experimental studies have shown that the precise frequency of gamma oscillations varies with input drive (e.g. visual contrast) and that it can differ among nearby cortical locations. This has challenged theories assuming widespread gamma synchronization at a fixed common frequency. In the present study, we investigated which principles govern gamma synchronization in the presence of input-dependent frequency modulations and whether they are detrimental for meaningful input-dependent gamma-mediated temporal organization. To this aim, we constructed a biophysically realistic excitatory-inhibitory network able to express different oscillation frequencies at nearby spatial locations. Similarly to cortical networks, the model was topographically organized with spatially local connectivity and spatially-varying input drive. We analyzed gamma synchronization with respect to phase-locking, phase-relations and frequency differences, and quantified the stimulus-related information represented by gamma phase and frequency. By stepwise simplification of our models, we found that the gamma-mediated temporal organization could be reduced to basic synchronization principles of weakly coupled oscillators, where input drive determines the intrinsic (natural) frequency of oscillators. The gamma phase-locking, the precise phase relation and the emergent (measurable) frequencies were determined by two principal factors: the detuning (intrinsic frequency difference, i.e. local input difference) and the coupling strength. In addition to frequency coding, gamma phase contained complementary stimulus information. Crucially, the phase code reflected input differences, but not the absolute input level. This property of relative input-to-phase conversion, contrasting with latency

  9. Radio frequency identification-enabled capabilities in a healthcare context: An exploratory study.

    Science.gov (United States)

    Hornyak, Rob; Lewis, Mark; Sankaranarayan, Balaji

    2016-09-01

    Increasingly, the adoption and use of radio frequency identification systems in hospital settings is gaining prominence. However, despite the transformative impact that radio frequency identification has in healthcare settings, few studies have examined how and why this change may occur. The purpose of this study is to systematically understand how radio frequency identification can transform work practices in an operational process that directly impacts cost and operational efficiency and indirectly contributes to impacting patient safety and quality of care. We leverage an interdisciplinary framework to explore the contextual characteristics that shape the assimilation of radio frequency identification in healthcare settings. By linking the use of radio frequency identification with specific contextual dimensions in healthcare settings, we provide a data-driven account of how and why radio frequency identification can be useful in inventory management in this setting. In doing so, we also contribute to recent work by information systems scholars who argue for a reconfiguration of conventional assumptions regarding the role of technology in contemporary organizations. © The Author(s) 2015.

  10. Frequency combs enable rapid and high-resolution multidimensional coherent spectroscopy

    Science.gov (United States)

    Lomsadze, Bachana; Cundiff, Steven T.

    2017-09-01

    Dual laser frequency combs can rapidly measure high-resolution linear absorption spectra. However, one-dimensional linear techniques cannot distinguish the sources of resonances in a mixture of different analytes, nor can they separate inhomogeneous and homogeneous broadening. Here, we overcame these limitations by acquiring high-resolution multidimensional nonlinear coherent spectra with frequency combs. We experimentally differentiated and assigned the Doppler-broadened features of two naturally occurring isotopes of rubidium atoms (87Rb and 85Rb) according to the placement of their hyperfine energy states in a two-dimensional spectrum.

  11. The Mason Water Data Information System (MWDIS): Enabling data sharing and discovery at George Mason University

    Science.gov (United States)

    Ferreira, C.; Da Silva, A. L.; Nunes, A.; Haddad, J.; Lawler, S.

    2014-12-01

    Enabling effective data use and re-use in scientific investigations relies heavily not only on data availability but also on efficient data sharing discovery. The CUAHSI led Hydrological Information Systems (HIS) and supporting products have paved the way to efficient data sharing and discovery in the hydrological sciences. Based on the CUAHSI-HIS framework concepts for hydrologic data sharing we developed a unique system devoted to the George Mason University scientific community to support university wide data sharing and discovery as well as real time data access for extreme events situational awareness. The internet-based system will provide an interface where the researchers will input data collected from the measurement stations and present them to the public in form of charts, tables, maps, and documents. Moreover, the system is developed in ASP.NET MVC 4 using as Database Management System, Microsoft SQL Server 2008 R2, and hosted by Amazon Web Services. Currently the system is supporting the Mason Watershed Project providing historical hydrological, atmospheric and water quality data for the campus watershed and real time flood conditions in the campus. The system is also a gateway for unprecedented data collection of hurricane storm surge hydrodynamics in coastal wetlands in the Chesapeake Bay providing not only access to historical data but recent storms such as Hurricane Arthur. Future research includes coupling the system to a real-time flood alert system on campus, and besides providing data on the World Wide Web, to foment and provide a venue for interdisciplinary collaboration within the water scientists in the region.

  12. Frequency and risk factors associated with emergency medical readmissions in Galway University Hospitals.

    LENUS (Irish Health Repository)

    Gorman, J

    2010-06-01

    Unplanned readmissions of medical hospital patients have been increasing in recent years. We examined the frequency and associates of emergency medical readmissions to Galway University Hospitals (GUH).

  13. Implementation and Demonstration of Grid Frequency Support by V2G Enabled Electric Vehicle

    DEFF Research Database (Denmark)

    Martinenas, Sergejus; Marinelli, Mattia; Andersen, Peter Bach

    2014-01-01

    Safe operation of the electric power system relies on conventional power stations. In addition to providing electrical energy to the network, some power stations also provide a number of ancillary services for the grid stability. These services could potentially be provided by the growing number...... of electric vehicles - faster and with better precision, using Vehicle-to-Grid technology. This paper explores the implementation of a system that demonstrates the use of the electric vehicles for providing frequency regulation in the Danish power grid. The system is tested with the use case of Primary...

  14. Manipulating waves by distilling frequencies: a tunable shunt-enabled rainbow trap

    Science.gov (United States)

    Cardella, Davide; Celli, Paolo; Gonella, Stefano

    2016-08-01

    In this work, we propose and test a strategy for tunable, broadband wave attenuation in electromechanical waveguides with shunted piezoelectric inclusions. Our strategy is built upon the vast pre-existing literature on vibration attenuation and bandgap generation in structures featuring periodic arrays of piezo patches, but distinguishes itself for several key features. First, we demystify the idea that periodicity is a requirement for wave attenuation and bandgap formation. We further embrace the idea of ‘organized disorder’ by tuning the circuits as to resonate at distinct neighboring frequencies. In doing so, we create a tunable ‘rainbow trap’ (Tsakmakidis et al 2007 Nature 450 397-401) capable of attenuating waves with broadband characteristics, by distilling (sequentially) seven frequencies from a traveling wavepacket. Finally, we devote considerable attention to the implications in terms of packet distortion of the spectral manipulation introduced by shunting. This work is also meant to serve as a didactic tool for those approaching the field of shunted piezoelectrics, and attempts to provide a different perspective, with abundant details, on how to successfully design an experimental setup involving resistive-inductive shunts.

  15. FREQUENCY OF HEARING IMPAIRMENT IN METAL INDUSTRY AND REPERCUSSION ON PROFESSIONAL ENABLING OF DEAF

    Directory of Open Access Journals (Sweden)

    Husnija Hasanbegović

    2011-04-01

    Full Text Available The survey has been done on sample of 1252 people. The target was to estimate damage of noise on professional rehabilitation of deaf population, which is mostly directed to professions in heavy industry, for professions in metal industry. Sample has been divided to 3 sub samples: 137 hearing people in metal industry; 106 hearing impaired adults with different professions and control group of 1000 hearing people. The results of survey point that work conditions contribute to hearing damage at employers in metal industry by comparison with hearing impairment of usual population. By comparative analysis of registered hearing impairments concerning age, statistically important difference in frequency of hearing impairment of two sub samples (t= 3.27, sing=.05. The relation between hearing impairment and years of working has been identifi ed at employers in heavy industry, (r=.37.

  16. Frequency of Hearing Impairment in Metal Industry and Repercussion on Professional Enabling of Deaf

    Directory of Open Access Journals (Sweden)

    Husnija Hasanbegovic

    2011-08-01

    Full Text Available The survey has been done on sample of 1252 people. The target was to estimate damage of noise on professional rehabilitation of deaf population, which is mostly directed to professions in heavy industry, for professions in metal industry. Sample has been divided to 3 sub samples: 137 hearing people in metal industry; 106 hearing impaired adults with different professions and control group of 1000 hearing people. The results of survey point that work conditions contribute to hearing damage at employers in metal industry by comparison with hearing impairment of usual population. By comparative analysis of registered hearing impairments concerning age, statistically important difference in frequency of hearing impairment of two sub samples (t= 3.27, sing=.05. The relation between hearing impairment and years of working has been identify ed at employers in heavy industry, (r=.37.

  17. Non-Maximally Decimated Filter Banks Enable Adaptive Frequency Hopping for Unmanned Aircraft Vehicles

    Science.gov (United States)

    Venosa, Elettra; Vermeire, Bert; Alakija, Cameron; Harris, Fred; Strobel, David; Sheehe, Charles J.; Krunz, Marwan

    2017-01-01

    In the last few years, radio technologies for unmanned aircraft vehicle (UAV) have advanced very rapidly. The increasing need to fly unmanned aircraft systems (UAS) in the national airspace system (NAS) to perform missions of vital importance to national security, defense, and science has pushed ahead the design and implementation of new radio platforms. However, a lot still has to be done to improve those radios in terms of performance and capabilities. In addition, an important aspect to account for is hardware cost and the feasibility to implement these radios using commercial off-the-shelf (COTS) components. UAV radios come with numerous technical challenges and their development involves contributions at different levels of the design. Cognitive algorithms need to be developed in order to perform agile communications using appropriate frequency allocation while maintaining safe and efficient operations in the NAS and, digital reconfigurable architectures have to be designed in order to ensure a prompt response to environmental changes. Command and control (C2) communications have to be preserved during "standard" operations while crew operations have to be minimized. It is clear that UAV radios have to be software-defined systems, where size, weight and power consumption (SWaP) are critical parameters. This paper provides preliminary results of the efforts performed to design a fully digital radio architecture as part of a NASA Phase I STTR. In this paper, we will explain the basic idea and technical principles behind our dynamic/adaptive frequency hopping radio for UAVs. We will present our Simulink model of the dynamic FH radio transmitter design for UAV communications and show simulation results and FPGA system analysis.

  18. Smart wing rotation and trailing-edge vortices enable high frequency mosquito flight

    Science.gov (United States)

    Bomphrey, Richard J.; Nakata, Toshiyuki; Phillips, Nathan; Walker, Simon M.

    2017-03-01

    Mosquitoes exhibit unusual wing kinematics; their long, slender wings flap at remarkably high frequencies for their size (>800 Hz)and with lower stroke amplitudes than any other insect group. This shifts weight support away from the translation-dominated, aerodynamic mechanisms used by most insects, as well as by helicopters and aeroplanes, towards poorly understood rotational mechanisms that occur when pitching at the end of each half-stroke. Here we report free-flight mosquito wing kinematics, solve the full Navier-Stokes equations using computational fluid dynamics with overset grids, and validate our results with in vivo flow measurements. We show that, although mosquitoes use familiar separated flow patterns, much of the aerodynamic force that supports their weight is generated in a manner unlike any previously described for a flying animal. There are three key features: leading-edge vortices (a well-known mechanism that appears to be almost ubiquitous in insect flight), trailing-edge vortices caused by a form of wake capture at stroke reversal, and rotational drag. The two new elements are largely independent of the wing velocity, instead relying on rapid changes in the pitch angle (wing rotation) at the end of each half-stroke, and they are therefore relatively immune to the shallow flapping amplitude. Moreover, these mechanisms are particularly well suited to high aspect ratio mosquito wings.

  19. Opening the low frequency window to the high redshift Universe

    NARCIS (Netherlands)

    Vedantham, Harish

    2015-01-01

    The epoch of formation of the first luminous structures (stars and galaxies) called the Comic Dawn, is one of the last unexplored periods in the history of the Universe. A new generation of radio telescopes such as LOFAR aim to revolutionize our understanding of structure formation in the early

  20. Study of manufacturing resource perception and process control of a radio-frequency-identification-enabled decentralized flexible manufacturing system

    Directory of Open Access Journals (Sweden)

    Zengqiang Jiang

    2017-01-01

    Full Text Available The fusion of mechatronics, communication, control, and information technologies has introduced new automation paradigms into the production environment. Plug-and-play flexible manufacturing systems will become suitable approaches in the future for the development of modular, flexible, and reconfigurable manufacturing systems, addressing the requirements of global markets. This article introduces a Petri Net model-driven methodology for the development, validation, and operation of a radio-frequency identification-enabled decentralized flexible manufacturing system. After analyzing the manufacturing processes and resources of a flexible manufacturing system, the manufacturing resources are classified into active and passive resources. Each active resource is equipped with a radio-frequency identification reader and each passive resource is banded with a radio-frequency identification tag. Real-time state and behavior logic models are built for manufacturing resources based on extended Petri Nets; the models are translated into XML and integrated with the manufacturing resources. In this fashion, each manufacturing resource becomes an autonomous agent, and it can make self-decisions and update its status through the twinned models. In this manner, automatic perception and process control are realized. Finally, the effectiveness and feasibility of the method are verified in an experimental system.

  1. The frequency of menorrhagia and bleeding disorders in university students.

    Science.gov (United States)

    Gursel, Turkiz; Biri, Aydan; Kaya, Zuhre; Sivaslıoglu, Selda; Albayrak, Meryem

    2014-08-01

    Menorrhagia is an important health problem in women of reproductive age. The aims of this study were to assess the prevalence of menorrhagia and hemostatic abnormalities associated with menorrhagia in university students. The pictorial blood assessment chart (PBAC) was used to identify students with menorrhagia. Those with a PBAC score > 100 were examined by pelvic ultrasound and laboratory tests including complete blood count, levels of clotting factors, von Willebrand factor antigen, and ristocetin cofactor activity and Platelet Function Analyser-100 (PFA-100). Platelet aggregation was studied in students with prolonged PFA-100 closure time. Menorrhagia was identified in 82 (21.8%) of 376 students. Six of 82 students who had pelvic pathologies were excluded. Eleven (14.5%) of the remaining 76 students were found to have bleeding disorders, including von Willebrand disease in five (6.5%), platelet function disorder in four (5.2%), and clotting factor deficiencies in two (2.6%). Menorrhagia is a common but mostly unrecognized and untreated problem among university students. Underlying bleeding disorders are not rare and require comprehensive hemostatic evaluation for identification.

  2. Preclinical evaluation of spatial frequency domain-enabled wide-field quantitative imaging for enhanced glioma resection

    Science.gov (United States)

    Sibai, Mira; Fisher, Carl; Veilleux, Israel; Elliott, Jonathan T.; Leblond, Frederic; Roberts, David W.; Wilson, Brian C.

    2017-07-01

    5-Aminolevelunic acid-induced protoporphyrin IX (PpIX) fluorescence-guided resection (FGR) enables maximum safe resection of glioma by providing real-time tumor contrast. However, the subjective visual assessment and the variable intrinsic optical attenuation of tissue limit this technique to reliably delineating only high-grade tumors that display strong fluorescence. We have previously shown, using a fiber-optic probe, that quantitative assessment using noninvasive point spectroscopic measurements of the absolute PpIX concentration in tissue further improves the accuracy of FGR, extending it to surgically curable low-grade glioma. More recently, we have shown that implementing spatial frequency domain imaging with a fluorescent-light transport model enables recovery of two-dimensional images of [PpIX], alleviating the need for time-consuming point sampling of the brain surface. We present first results of this technique modified for in vivo imaging on an RG2 rat brain tumor model. Despite the moderate errors in retrieving the absorption and reduced scattering coefficients in the subdiffusive regime of 14% and 19%, respectively, the recovered [PpIX] maps agree within 10% of the point [PpIX] values measured by the fiber-optic probe, validating its potential as an extension or an alternative to point sampling during glioma resection.

  3. W-Band Millimeter-Wave Vector Signal Generation Based on Precoding-Assisted Random Photonic Frequency Tripling Scheme Enabled by Phase Modulator

    National Research Council Canada - National Science Library

    Li, Xinying; Xu, Yuming; Xiao, Jiangnan; Yu, Jianjun

    2016-01-01

    We propose W-band photonic millimeter-wave (mm-wave) vector signal generation employing a precoding-assisted random frequency tripling scheme enabled by a single phase modulator cascaded with a wavelength selective switch (WSS...

  4. Rare Earth or Cosmic Zoo: Testing the Frequency of Complex Life in the Universe

    Science.gov (United States)

    Bains, W.; Schulze-Makuch, D.

    2017-02-01

    We propose how to test between two major hypotheses about the frequency of life in the universe (Rare Earth and Cosmic Zoo) using future remote sensing capabilities targeted at exoplanets and site visits of planetary bodies in our solar system.

  5. Enabling Universal Memory by Overcoming the Contradictory Speed and Stability Nature of Phase-Change Materials

    Science.gov (United States)

    Wang, Weijie; Loke, Desmond; Shi, Luping; Zhao, Rong; Yang, Hongxin; Law, Leong-Tat; Ng, Lung-Tat; Lim, Kian-Guan; Yeo, Yee-Chia; Chong, Tow-Chong; Lacaita, Andrea L.

    2012-01-01

    The quest for universal memory is driving the rapid development of memories with superior all-round capabilities in non-volatility, high speed, high endurance and low power. Phase-change materials are highly promising in this respect. However, their contradictory speed and stability properties present a key challenge towards this ambition. We reveal that as the device size decreases, the phase-change mechanism changes from the material inherent crystallization mechanism (either nucleation- or growth-dominated), to the hetero-crystallization mechanism, which resulted in a significant increase in PCRAM speeds. Reducing the grain size can further increase the speed of phase-change. Such grain size effect on speed becomes increasingly significant at smaller device sizes. Together with the nano-thermal and electrical effects, fast phase-change, good stability and high endurance can be achieved. These findings lead to a feasible solution to achieve a universal memory. PMID:22496956

  6. Enabling Mobile Communications for the Needy: Affordability Methodology, and Approaches to Requalify Universal Service Measures

    Directory of Open Access Journals (Sweden)

    Louis-Francois PAU

    2009-01-01

    Full Text Available This paper links communications and media usage to social and household economics boundaries. It highlights that in present day society, communications and media are a necessity, but not always affordable, and that they furthermore open up for addictive behaviors which raise additional financial and social risks. A simple and efficient methodology compatible with state-of-the-art social and communications business statistics is developed, which produces the residual communications and media affordability budget and ultimately the value-at-risk in terms of usage and tariffs. Sensitivity analysis provides precious information on bottom-up communications and media adoption on the basis of affordability. This approach differs from the regulated but often ineffective Universal service obligation, which instead of catering for individual needs mostly addresses macro-measures helping geographical access coverage (e.g. in rural areas. It is proposed to requalify the Universal service obligations on operators into concrete measures, allowing, with unchanged funding, the needy to adopt mobile services based on their affordability constraints by bridging the gap to a standard tariff. Case data are surveyed from various countries. ICT policy recommendations are made to support widespread and socially responsible communications access.

  7. Enabling disability inclusive practices within the University of Cape Town curriculum: A case study

    Science.gov (United States)

    Ohajunwa, Chioma

    2015-01-01

    Background Disability inclusion in the curricula of higher education institutions contributes to socially responsive graduates with a capacity to address the cross-cutting issue of disability in development. This article discusses a study conducted at the University of Cape Town (UCT), South Africa, to explore disability inclusion. Methodology An instrumental case study approach was adopted and a thematic analysis of data was done. Findings Academic staff found a variety of ways to include disability, such as discussions in class, practice and service learning, but mainly as part of disciplinary requirements. Including disability as an issue of social justice stems mostly from the personal interest of staff, and is done in an ad hoc manner. Conclusion Disability should be valued, and integrated into the curriculum in a structured manner as a perspective on diversity with which to interrogate our beliefs about ourselves and society. Theorising on disability is needed, as well as the unique perspectives that emerge across interdisciplinary boundaries, especially within the African context. PMID:28730025

  8. Enabling disability inclusive practices within the University of Cape Town curriculum: A case study

    Directory of Open Access Journals (Sweden)

    Chioma Ohajunwa

    2015-02-01

    Full Text Available Background: Disability inclusion in the curricula of higher education institutions contributes to socially responsive graduates with a capacity to address the cross-cutting issue of disability in development. This article discusses a study conducted at the University of Cape Town (UCT, South Africa, to explore disability inclusion. Methodology: An instrumental case study approach was adopted and a thematic analysis of data was done. Findings: Academic staff found a variety of ways to include disability, such as discussions in class, practice and service learning, but mainly as part of disciplinary requirements. Including disability as an issue of social justice stems mostly from the personal interest of staff, and is done in an ad hoc manner. Conclusion: Disability should be valued, and integrated into the curriculum in a structured manner as a perspective on diversity with which to interrogate our beliefs about ourselves and society. Theorising on disability is needed, as well as the unique perspectives that emerge across interdisciplinary boundaries, especially within the African context.

  9. The usage and impact of Internet enabled phones on academic concentration among students of tertiary institutions: A study at the University of Ibadan, Nigeria

    National Research Council Canada - National Science Library

    Emeka Ezemenaka

    2013-01-01

    .... This study looks into the usage and perceived effect implications internet enabled phones have on the academic performance of the tertiary students using University of Ibadan students in Nigeria as a case study...

  10. The Usage and Impact of Internet Enabled Phones on Academic Concentration among Students of Tertiary Institutions: A Study at the University of Ibadan, Nigeria

    Science.gov (United States)

    Ezemenaka, Emeka

    2013-01-01

    The usage of Internet enabled phones has been a 21st century phenomenon that spreads for different purposes and functions. This study looks into the usage and perceived effect implications internet enabled phones have on the academic performance of the tertiary students using University of Ibadan students in Nigeria as a case study. The study was…

  11. Wired/wireless access integrated RoF-PON with scalable generation of multi-frequency MMWs enabled by tunable optical frequency comb.

    Science.gov (United States)

    Xiang, Yu; Jiang, Ning; Chen, Chen; Zhang, Chongfu; Qiu, Kun

    2013-08-26

    In this paper, a novel wired/wireless access integrated radio-over-fiber passive optical network (RoF-PON) system that utilizes scalable multiple-frequency millimeter-wave (MF-MMW) generation based on tunable optical frequency comb (TOFC) is proposed. The TOFC is performed by cascading a phase modulator (PM) and two intensity modulators (IMs), and with proper selection of the peak-to-peak voltage of the PM, a flat and effective optical comb with tens of frequency lines is achieved. The MF-MMWs are generated by beating the optical comb line pairs with an interval about 60 GHz. The feasibility and scalability of the proposed wired/wireless access integrated RoF-PON scheme are confirmed by the simulations of simultaneous distribution of wired and wireless data with the proposed multiple frequency MMW generation technology.

  12. Statistical universalities in fragmentation under scaling symmetry with a constant frequency of fragmentation

    Energy Technology Data Exchange (ETDEWEB)

    Gorokhovski, M A [Laboratoire de Mecanique des Fluides et d' Acoustique, CNRS - Ecole Centrale de Lyon - INSA Lyon - Universite Claude Bernard Lyon 1, 36 Avenue Guy de Collongue, 69134 Ecully Cedex (France); Saveliev, V L [Institut of Ionosphere, Kamenskoe Plato, 050020 Almaty (Kazakhstan)], E-mail: mikhael.gorokhovski@ec-lyon.fr, E-mail: saveliev@topmail.kz

    2008-04-21

    This paper analyses statistical universalities that arise over time during constant frequency fragmentation under scaling symmetry. The explicit expression of particle-size distribution obtained from the evolution kinetic equation shows that, with increasing time, the initial distribution tends to the ultimate steady-state delta function through at least two intermediate universal asymptotics. The earlier asymptotic is the well-known log-normal distribution of Kolmogorov (1941 Dokl. Akad. Nauk. SSSR 31 99-101). This distribution is the first universality and has two parameters: the first and the second logarithmic moments of the fragmentation intensity spectrum. The later asymptotic is a power function (stronger universality) with a single parameter that is given by the ratio of the first two logarithmic moments. At large times, the first universality implies that the evolution equation can be reduced exactly to the Fokker-Planck equation instead of making the widely used but inconsistent assumption about the smallness of higher than second order moments. At even larger times, the second universality shows evolution towards a fractal state with dimension identified as a measure of the fracture resistance of the medium.

  13. A Guided Wave Sensor Enabling Simultaneous Wavenumber-Frequency Analysis for Both Lamb and Shear-Horizontal Waves.

    Science.gov (United States)

    Ren, Baiyang; Cho, Hwanjeong; Lissenden, Cliff J

    2017-03-01

    Guided waves in plate-like structures have been widely investigated for structural health monitoring. Lamb waves and shear horizontal (SH) waves, two commonly used types of waves in plates, provide different benefits for the detection of various types of defects and material degradation. However, there are few sensors that can detect both Lamb and SH waves and also resolve their modal content, namely the wavenumber-frequency spectrum. A sensor that can detect both waves is desirable to take full advantage of both types of waves in order to improve sensitivity to different discontinuity geometries. We demonstrate that polyvinylidene difluoride (PVDF) film provides the basis for a multi-element array sensor that detects both Lamb and SH waves and also measures their modal content, i.e., the wavenumber-frequency spectrum.

  14. Frequency of healthy eating habits among students of a public university in Northeastern Brazil

    Directory of Open Access Journals (Sweden)

    Natanael de Jesus Silva

    2016-06-01

    Full Text Available Objective: The aim of this study was to measure the frequency of healthy eating habits among students of a public university in Northeastern Brazil. Methods: This is a cross-sectional population-based study. The sample was randomly composed of 933 undergraduate students of both genders aged 18-35 years. The frequency of healthy eating habits was assessed based on the adherence to the 10 Steps to Healthy Eating proposed by Brazil’s Ministry of Health. The frequency of each step was measured through questions compiled from previous publications. Results: The steps to the healthy eating with the lowest frequencies of adherence were related to the practice of adding salt to prepared foods (18.6%, n=185 and to the consumption of fruits and vegetables (28.3%, n=281 and foods rich in fat (21.5%, n=213 and sugar (48.9%, n=486. However, there was an adequate consumption of beans (83.8%, n=832 and a prevalence of normal nutritional status of 69.6% (n=691 among the students. None of the interviewees followed all the steps to the healthy eating. The average adherence rate was at least 6 steps. Men and women presented different habits and food preferences. Conclusion: The university students presented a low frequency of healthy eating habits due to the high intake of food high in fat and sugar and mainly the low consumption of fruits and vegetables and the practice of adding salt to prepared foods. This may, in turn, predispose them to increased risks of morbidity and mortality from noncommunicable diseases.

  15. Universal low-frequency asymptotes of dynamic conic nanopore rectification: An ionic nanofluidic inductor

    Science.gov (United States)

    Yan, Yu; Schiffbauer, Jarrod; Yossifon, Gilad; Chang, Hsueh-Chia

    2015-12-01

    We report the first nanofluidic inductor (L) to complement the known nanofluidic capacitors (C), resistors (R), and diodes for ion currents. Under negative bias, the nanopore behaves like a parallel RC circuit at low frequencies; however, under positive bias, the asymptotic dynamics is that of a serial RL circuit. This new ionic circuit element can lead to nanofluidic RLC or diode-inductor oscillator circuits and new intrapore biosensing/rapid sequencing strategies. A universal theory, with explicit estimates for the capacitance and inductance at opposite biases, is derived to collapse the rectified dynamics of all conic nanopores to facilitate design of this new nanofluidic circuit.

  16. Comparing internal influential factors affecting accreditation processes in Dutch and Dutch-Caribbean universities: enablers and barriers

    NARCIS (Netherlands)

    Isabella, S.A.; Westerheijden, Donald F.

    2015-01-01

    Obtaining accredited status is of great importance for programmes offered in universities, regardless of their scale, location on this globe and developmental status. However, there are few studies on this in small universities in the global south. During 2009 – 2014 a study was conducted on

  17. Promoting universal financial protection: constraints and enabling factors in scaling-up coverage with social health insurance in Nigeria

    National Research Council Canada - National Science Library

    Onoka, Chima A; Onwujekwe, Obinna E; Uzochukwu, Benjamin S; Ezumah, Nkoli N

    2013-01-01

    The National Health Insurance Scheme (NHIS) in Nigeria was launched in 2005 as part of efforts by the federal government to achieve universal coverage using financial risk protection mechanisms. However, only 4...

  18. Developing as an Academic Leader in a University of Technology in South Africa: Dealing with enabling and constraining teaching and learning environments

    Directory of Open Access Journals (Sweden)

    'Mabokang Liteboho Monnapula-Mapesela

    2017-12-01

    Full Text Available While the South African legislation is an enabler for equity, inclusiveness, social justice and the advancement of women for academic leadership roles, institutional cultures and structures are often debilitating. This paper presents the development trajectory of a Black woman as an academic development leader in a South African University of Technology. It examines structural and cultural factors acting as enablers or constraints to leadership development and career advancement for Black women. It analyses dominant structural frames and undertakings of different University stakeholders (agents, which cause stagnation and resistance to morphogenesis and government’s transformation agenda. Using Participatory Narrative Inquiry (PNI, I narrate personal experiences and insights as a participant researcher. I interrogate the experiences, observations and influence of various structural and cultural modalities within Margaret Archer’s (1995 social realist framework of structure, culture and agency. I highlight the implications of these for development of a Black female academic development leader.

  19. Lifelong learning in practice : Understanding and enabling meaningful participation of non-traditional students in university education in Uganda

    NARCIS (Netherlands)

    Tumuheki, Peace

    2017-01-01

    Since the liberalisation of higher education in Uganda in the early 1990s, a lot of changes have taken place in the organisation and provision of university education. The changes are not only seen in the diversification of providers and programmes of study but also in the nature of the students’

  20. The Combination Design of Enabling Technologies in Group Learning: New Study Support Service for Visually Impaired University Students

    Science.gov (United States)

    Tangsri, Chatcai; Na-Takuatoong, Onjaree; Sophatsathit, Peraphon

    2013-01-01

    This article aims to show how the process of new service technology-based development improves the current study support service for visually impaired university students. Numerous studies have contributed to improving assisted aid technology such as screen readers, the development and the use of audiobooks, and technology that supports individual…

  1. Faculty Perceptions of Challenges and Enablers of Effective Teaching in a Large Research-Intensive University: Preliminary Findings

    Science.gov (United States)

    Briseño-Garzón, Adriana; Han, Andrea; Birol, Gülnur; Bates, Simon; Whitehead, Lorne

    2016-01-01

    In October 2014, the University of British Columbia Vancouver campus (UBCV) ran a campus-wide survey to establish baseline information on teaching practices and attitudes among faculty, to measure the impact of existing teaching and learning initiatives and to identify the conditions leading to change in practices and attitudes around teaching.…

  2. A BLUEPRINT OF SOFTWARE ENABLED QUANTITATIVE MEASUREMENT OF PROGRAMME OUTCOMES: A CASE STUDY FOR TAYLOR’S UNIVERSITY

    Directory of Open Access Journals (Sweden)

    REYNATO ANDAL GAMBOA

    2013-04-01

    Full Text Available Lecturers are fully occupied with many tasks including preparing teaching materials, exam papers, lab sheets, markings, research, and administrative support tasks required of them to maintain high standard teaching delivery and good quality management system in the school. Aside from these, they are now required to do intensive Outcome-Based Education (OBE assessments, and Continual Quality Improvement (CQI planning and implementation. An automated OBE assessment tool is therefore required to ease the burden among the lecturers and provide a standard method of assessment. To assist in this process, this paper presents a blueprint of a software-enabled quantitative measurement of the Learning Outcomes (LO and the Programme Outcomes (PO in the module level. The blueprint consists of macro-enabled worksheets that automatically calculate the students’ individual LO and PO attainments based on their respective module assessment marks whereby the lecturer only need to key-in the subject details of assessments-LO mapping, LO-PO mapping and the students’ assessment marks. Once the marks are in place, LO and PO attainments are calculated automatically to provide the corresponding bar charts based on the individual attainments of the students. A LO or a PO is said to be attained when the number of students achieved the Key Performance Index (KPI set by the department. The results will then be used by the lecturer to prepare an annual module review and prepare a CQI plan for the next semester.

  3. Research data supporting "Highly-Efficient Perovskite Nanocrystal Light-Emitting Diodes Enabled by a Universal Cross-linking Method"

    OpenAIRE

    Li, Guangru; Wisnivesky-Rocca-Rivarola, Florencia; Davis, Nathaniel J. L. K.; Bai, Sai; Jellicoe, Tom C.; de la Peña, Francisco; Hou, Shaocong; Ducati, Caterina; Gao, Feng; Friend, Richard H.; Greenham, Neil C.; Tan, Zhi-Kuang

    2016-01-01

    The data corresponds to the images in the paper, the user need to have a power point and an origin software, and then open the data by clicking the images in the powerpoint. This work was supported by the EPSRC [Grant numbers EP/M005143/1, EP/J017361/1 and EP/G037221/1], CNPq [Grant number 246050/2012-8], ERC [grant number 259619], PHOTO-EM EU [grant number 312483 ESTEEM2], Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University [gran...

  4. Dietary sodium intake by semi-quantitative food frequency questionnaire among undergraduate students of Mahidol University.

    Science.gov (United States)

    Pavadhgul, Patcharanee; Sunthonwaraluk, Supawadee; Srisorachatr, Suwat; Temcharoen, Paradee

    2009-12-01

    To assess sodium intake and identify its sources among undergraduate students aged 17 to 20 years who lived in the dormitory of Mahidol University, Salaya Campus. A cross sectional study was conducted among 170 students in July 2007. Data were collected using a semi-quantitative food frequency questionnaire. The mean total daily sodium intake was 5,225.0 +/- 2,228.9 mg for males and 4,497.9 +/- 2,091.2 mg for females. Male students consumed significantly higher sodium than females (p = 0.030). Daily sodium intake mainly came from one plate meals in the campus cafeteria which the average was 2,852.3 +/- 1,421.8 mg/day in males and 2,042.3 +/- 1,214.2 mg/day in females. Males consumed significantly higher sodium from one plate meals than females (p students was 2-fold higher than recommended amount (2,400 mg per day). The findings revealed that the undergraduate students who mainly consumed one plate meals are at risk of high sodium intake. Nutrition promotion for reducing sodium consumption in students and food vendors is needed for early prevention of chronic diseases in later life.

  5. [High frequency of plagiarism in medical thesis from a Peruvian public university].

    Science.gov (United States)

    Saldaña-Gastulo, J Jhan C; Quezada-Osoria, C Claudia; Peña-Oscuvilca, Américo; Mayta-Tristán, Percy

    2010-03-01

    An observational study was conducted to describe the presence of plagiarism in medical thesis in 2008 performed at a public university in Peru. Search for plagiarism in 33 thesis introductions using a Google search algorithm, characterizes of the study type and we search in electronic form if the thesis mentor have published articles in scientific journals. We found evidence of plagiarism in 27/33 introductions, 37.3% (171/479) of all the paragraphs analyzed had some degree of plagiarism, literal plagiarism was the most frequent (20/27) and journals were the most common sources of plagiarism (19/27). The characteristics of the studies were observational (32/33), cross-sectional (30/33), descriptive (25/33) and retrospective (19/33). None of the authors had published in a scientific journal, and only nine of his tutors of them had at least one publication. No association was found between the characteristics of the thesis and the presence of plagiarism. In conclusion, we found a high frequency of plagiarism in theses analyzed. Is responsibility of medical schools take the necessary actions to detect and avoid plagiarism among their students.

  6. Athlete presentations and sports injury frequencies by sport branches at a university sports medicine clinic.

    Science.gov (United States)

    Tahirbegolli, Bernard; Dinçer, Şensu; Gözübüyük, Ömer B; Değirmenci, Ufuk; Yildiz, Safinaz; Vehid, Suphi

    2017-02-22

    We aimed to investigate the profile of athletes by determining the branch of sports, type, and area of sustained sports injury, and the frequencies through athletes' presentations to the largest university clinic in one of the most crowded and athletepopulated cities of Turkey, Istanbul. THE study population comprised 1302 athletes who presented to the sports medicine clinic between the dates of July 1st, 2014, and June 30th, 2015. This record-based study examined all athlete presentations using the physical examination cards. Eight hundred sixty-five of the athletes were male. The median age of applicants was 21 years (interquartile range 16-30 years), the median body mass index was 22.23 kg/m2 (range, 20.01-24.67 kg/m2), and the median years of sports activity was 5 years (range, 0-10 years). Presentations to the clinic were significantly higher in April (p=0.003). The most commonly injured body part was the knee and soccer was the leading sport among the patients; anterior cruciate ligament injury was the most common pathology among soccer players. Athletes who presented to our clinic most commonly sustained a lower extremity injury. It was notable that ligament injuries were seen as commonly as muscle injuries.

  7. Using the Web to Enable Industry-University Collaboration: An Action Research Study of a Course Partnership

    Directory of Open Access Journals (Sweden)

    Ned Kock Temple

    2000-01-01

    Full Text Available This paper discusses a course partnership involving Day & Zimmermann, Inc. (DZI, a large engineering and professional services company, and Temple University. The course was taught between the months of May and July of 1999 and its main goal was to teach students business process redesign concepts and techniques. These concepts and techniques were used to redesign five business processes from DZI's information technology organization. DZI's CIO and a senior manager, who played the key role of project manager, championed the course partnership. A Web site with bulletin boards, multimedia components and static content was used to support the partnership. The paper investigates the use of Web-based collaboration technologies in combination with communication behavior norms and face-to-face meetings, and its effect on the success of the partnership.

  8. Enabling HST UV Exploration of the Low Surface Brightness Universe: A Pilot Study with the WFC3 X Filter Set

    Science.gov (United States)

    Thilker, David

    2017-08-01

    We request 17 orbits to conduct a pilot study to examine the effectiveness of the WFC3/UVIS F300X filter for studying fundamental problems in star formation in the low density regime. In principle, the broader bandpass and higher throughput of F300X can halve the required observing time relative to F275W, the filter of choice for studying young stellar populations in nearby galaxies. Together with F475W and F600LP, this X filter set may be as effective as standard UVIS broadband filters for characterizing the physical properties of such populations. We will observe 5 low surface brightness targets with a range of properties to test potential issues with F300X: the red tail to 4000A and a red leak beyond, ghosts, and the wider bandpass. Masses and ages of massive stars, young star clusters, and clumps derived from photometry from the X filter set will be compared with corresponding measurements from standard filters. Beyond testing, our program will provide the first sample spanning a range of LSB galaxy properties for which HST UV imaging will be obtained, and a glimpse into the ensemble properties of the quanta of star formation in these strange environments. The increased observing efficiency would make more tractable programs which require several tens to hundreds of orbits to aggregate sufficient numbers of massive stars, young star clusters, and clumps to build statistical samples. We are hopeful that our pilot observations will broadly enable high-resolution UV imaging exploration of the low density frontier of star formation while HST is still in good health.

  9. Ground based THz Spectroscopy of Obscured Starbursts in the Early Universe enabled by the 2nd generation Redshift (z) & Early Universe Spectrometer (ZEUS-2)

    Science.gov (United States)

    Vishwas, Amit; Stacey, Gordon; Nikola, Thomas; Ferkinhoff, Carl; Parshley, Stephen; Schoenwald, Justin; Lamarche, Cody James; Higdon, James; Higdon, Sarah; Brisbin, Drew; Güesten, Rolf; Weiss, Axel; Menten, Karl; Irwin, Kent; Cho, Hsiao-Mei; Niemack, Michael; Hilton, Gene; Hubmayr, Johannes; Amiri, Mandana; Halpern, Mark; Wiebe, Donald; Hasselfield, Matthew; Ade, Peter; Tucker, Carole

    2018-01-01

    Galaxies were surprisingly dusty in the early Universe, with more than half of the light emitted from stars being absorbed by dust within the system and re-radiated into far infrared (FIR, ~50-150μm) wavelengths. Dusty star forming galaxies (DSFGs) dominate the co-moving star formation rate density of the Universe that peaks around redshift, z~2, making it compelling to study them in rest frame FIR bands. From galaxies at z > 1, the FIR line emission from abundant ions like [O III], [C II] and [N II], are redshifted into the short sub-mm telluric windows. My thesis work is based on building and deploying the 2nd Generation Redshift (z) and Early Universe Spectrometer (ZEUS-2), a long-slit, echelle grating spectrometer optimized to study broad (Δv = 300km/s) spectral lines from galaxies in the 200-650µm telluric windows using TES bolometers. These far-IR lines being extinction free and major coolants of the gas heated by (young) massive stars, are powerful probes of the physical conditions of the gas and the stellar radiation field. I present results from our survey of the [O III] 88µm line in galaxies at redshift, z ~ 2.8 to 4.6, with ZEUS-2 at the Atacama Pathfinder Experiment (APEX) Telescope. To interpret our observations along with ancillary data from optical to radio facilities, we apply photoionization models for HII regions and Photo Dissociation Region (PDR) models and confirm that the galaxies host substantial ongoing obscured star formation. The presence of doubly ionized oxygen suggests hard radiation fields and hence, elevated ionization parameters that can only be accounted for by a large population of massive stars formed during the ongoing starburst, that contribute a large fraction of the infrared luminosity. This study highlights the use of FIR line emission to trace the assembly of current day massive galaxies, conditions of star formation and details of their stellar populations. The construction and operation of ZEUS-2 were funded by NSF ATI

  10. Validating the operational bias and hypothesis of universal exponent in landslide frequency-area distribution.

    Directory of Open Access Journals (Sweden)

    Jr-Chuan Huang

    Full Text Available The exponent decay in landslide frequency-area distribution is widely used for assessing the consequences of landslides and with some studies arguing that the slope of the exponent decay is universal and independent of mechanisms and environmental settings. However, the documented exponent slopes are diverse and hence data processing is hypothesized for this inconsistency. An elaborated statistical experiment and two actual landslide inventories were used here to demonstrate the influences of the data processing on the determination of the exponent. Seven categories with different landslide numbers were generated from the predefined inverse-gamma distribution and then analyzed by three data processing procedures (logarithmic binning, LB, normalized logarithmic binning, NLB and cumulative distribution function, CDF. Five different bin widths were also considered while applying LB and NLB. Following that, the maximum likelihood estimation was used to estimate the exponent slopes. The results showed that the exponents estimated by CDF were unbiased while LB and NLB performed poorly. Two binning-based methods led to considerable biases that increased with the increase of landslide number and bin width. The standard deviations of the estimated exponents were dependent not just on the landslide number but also on binning method and bin width. Both extremely few and plentiful landslide numbers reduced the confidence of the estimated exponents, which could be attributed to limited landslide numbers and considerable operational bias, respectively. The diverse documented exponents in literature should therefore be adjusted accordingly. Our study strongly suggests that the considerable bias due to data processing and the data quality should be constrained in order to advance the understanding of landslide processes.

  11. Frequency of fab subtypes in acute myeloid leukemia patients at Aga Khan University Hospital Karachi.

    Science.gov (United States)

    Harani, Mahadev S; Adil, Salman Naseem; Shaikh, Mohammad Usman; Kakepoto, Ghulam Nabi; Khurshid, Mohammmad

    2005-01-01

    Acute myeloid leukemia (AML) is a heterogeneous disease. Therefore, various parameters are needed to classify this disease into subtypes, so that specific treatment approaches can be utilized effectively. The commonly used method for diagnosis and classification is based on FAB criteria using morphology and cytochemical stains. For some of the categories, immunophenotyping is necessary. The aim of present study is to determine the frequency of various sub types in acute myeloid leukemia using FAB criteria in our population. This will aid in the correct diagnosis of acute leukemia and hence proper management of the patients. This is descriptive case control study conducted at Aga Khan University Hospital from January 1999 to December 2000. The total number of subjects was 116 that included both adults and children. The patients were diagnosed on the basis of bone marrow morphology using FAB classification. Cytochemistry was done in all cases, while immunophenotyping was considered only in those cases that were found to be problematic. Among 116 patients, 70 were males and 46 were females with male to female ratio 1.5:1. The age ranged between 6 months to 85 years with a mean age of 32 years. AML-M4 was the predominant French-American-British (FAB) subtype (36.2%) followed by M2 (30.25%), M3 (10.4%), M1 (8.7%), M0 (7.7%), M5a (3.5%), M5b (2.5%) and M6 (0.8%). The most common FAB subtype observed in our study was Acute myelomonocytic leukemia (M4) which is in accordance with studies reported from Saudia Arabia and a previous study reported from our institution. However,other national and international studies have reported Myeloblastic Leukemia with maturation (M2) as the predominant subtype of AML.

  12. Universal intracultural and intercultural dimensions of the recalled frequency of emotional experience

    NARCIS (Netherlands)

    Kuppens, Peter; Ceulemans, Eva; Timmerman, Marieke E.; Diener, Ed; Kim-Prieto, Chu

    This study examined the relative contribution and the nature of dimensions underlying intracultural and intercultural differences in the recalled frequency of emotional experience. From 48 nations, 9,300 participants provided self-reports of the frequency of experienced emotions and several other

  13. Comparison of Cell Phone Usage Frequencies and Brand Preferences of Public and Private University Education Faculty Students

    Directory of Open Access Journals (Sweden)

    Aylin TUTGUN ÜNAL

    2013-06-01

    Full Text Available In this research, cell phone usage frequencies and brand preferences of the education faculty students were examined. Research was conducted with 985 students from Marmara University Ataturk Education Faculty and Maltepe University Education Faculty in Istanbul. For the collection of data, “cell phone usage frequency and brand preference determination survey” was used. In the research, various results were obtained and some of which are as follows: a Students use cell phone intensively for and ratio for usage more than 1 hour is over the average(56.5%. b When the made / received calls were examined it is interesting that 20 and more calls are received (8% and more than 40, 50, 100 calls are made even in little ratios. c Students receive (31.7% and send (31.5% more than 100 messages. d Students mostly prefer Turkcell operator, Young Tariff and mostly prefer Nokia brand. It was understood that usage frequencies and brand preferences of state and foundation universities are significantly different from each other. In the research the intensive cell phone usage of Education Faculty students were emphasized and at the end of the research discussions and suggestions took place related with arranging cell phone usage habits of the students

  14. High-frequency sound waves to eliminate a horizon in the mixmaster universe.

    Science.gov (United States)

    Chitre, D. M.

    1972-01-01

    From the linear wave equation for small-amplitude sound waves in a curved space-time, there is derived a geodesiclike differential equation for sound rays to describe the motion of wave packets. These equations are applied in the generic, nonrotating, homogeneous closed-model universe (the 'mixmaster universe,' Bianchi type IX). As for light rays described by Doroshkevich and Novikov (DN), these sound rays can circumnavigate the universe near the singularity to remove particle horizons only for a small class of these models and in special directions. Although these results parallel those of DN, different Hamiltonian methods are used for treating the Einstein equations.

  15. High-frequency nanofluidics: a universal formulation of the fluid dynamics of MEMS and NEMS.

    Science.gov (United States)

    Ekinci, K L; Yakhot, V; Rajauria, S; Colosqui, C; Karabacak, D M

    2010-11-21

    A solid body undergoing oscillatory motion in a fluid generates an oscillating flow. Oscillating flows in Newtonian fluids were first treated by G.G. Stokes in 1851. Since then, this problem has attracted much attention, mostly due to its technological significance. Recent advances in micro- and nanotechnology require that this problem be revisited: miniaturized mechanical resonators with linear dimensions in microns and sub-microns-microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS), respectively-give rise to oscillating flows when operated in fluids. Yet flow parameters for these devices, such as the characteristic flow time and length scales, may deviate greatly from those in Stokes' solution. As a result, new and interesting physics emerges with important consequences to device applications. In this review, we shall provide an introduction to this area of fluid dynamics, called high-frequency nanofluidics, with emphasis on both theory and experiments.

  16. Analysis of Natural Frequencies in the Universal Programs for Dynamic Processes Analysis

    Directory of Open Access Journals (Sweden)

    V. A. Trudonoshin

    2016-01-01

    Full Text Available Finding the natural frequencies of complex technical objects is an important design procedure. This type of analysis allows us to determine the resonant frequencies and, as a consequence, to avoid their adverse impact on dynamics the projected object or that of under study. This applies to both the objects with distributed parameters, and the objects with lumped parameters. As to the first type of the objects, in almost every package that implements the finite element method, this type of analysis is available. The situation is different for the objects with lumped parameters. Methods to have the mathematical models for these objects look to implicit methods of numerical integration of ordinary differential equations. And the component equations of the reactive branches are sampled by numerical integration formulas, and the derivatives of state variables disappear from the vector of the unknowns of a mathematical model. In this case, talk about the implementation of the procedure for finding natural frequencies by finding eigenvalues is simply unnecessary. In cases where a mathematical model of the object is given in the normal Cauchy form, obtaining the natural frequencies is reduced to finding the eigenvalues of the coefficient matrix. There are methods to form the mathematical models in which the derivatives of the state variables make a sub-vector of the vector of unknowns. These are generalized, advanced nodal methods, and an advanced nodal one for mechanical systems. There can be a try for reduction of the mathematical models of objects, obtained by these methods, to the normal Cauchy form. The article discusses a similar procedure for the generalized and advanced nodal methods. As for the extended nodal method for mechanical systems there is specifics the article does not show. For the model obtained by generalized method the vector of unknown variables is permutated so that a sub-vector of the derivatives of the state variables was in

  17. Wired/wireless access integrated RoF-PON with scalable generation of multi-frequency MMWs enabled by polarization multiplexed FWM in SOA.

    Science.gov (United States)

    Xiang, Yu; Chen, Chen; Zhang, Chongfu; Qiu, Kun

    2013-01-14

    In this paper, we propose and demonstrate a novel integrated radio-over-fiber passive optical network (RoF-PON) system for both wired and wireless access. By utilizing the polarization multiplexed four-wave mixing (FWM) effect in a semiconductor optical amplifier (SOA), scalable generation of multi-frequency millimeter-waves (MMWs) can be provided so as to assist the configuration of multi-frequency wireless access for the wire/wireless access integrated ROF-PON system. In order to obtain a better performance, the polarization multiplexed FWM effect is investigated in detail. Simulation results successfully verify the feasibility of our proposed scheme.

  18. [The frequency of risk factors associated with obesity and being overweight in university students from Colima, Mexico].

    Science.gov (United States)

    Trujillo-Hernández, Benjamín; Vásquez, Clemente; Almanza-Silva, José R; Jaramillo-Virgen, María E; Mellin-Landa, Tadeana E; Valle-Figueroa, Ofelia B; Pérez-Ayala, Roberto; Millán-Guerrero, Rebeca O; Prieto-Díaz-Chávez, Emilio; Newton-Sánchez, Oscar

    2010-04-01

    Determining risk factor frequency regarding obesity and being overweight in university students. A cross-sectional analytic study was carried out on 821 students from the University of Colima. Some variables analysed were age, gender, alcoholism, smoking and weight-control drug use. 821 students were included (380 male, 441 female), 20.9±2.5 average age. 27.8 % of males were overweight and 14.7 % suffered from obesity; this was 17 % and 5.2 % in females, respectively. Smoking (2.1 OR; 1.4-3.8 95 % CI; p=0.01) and alcoholism (2.1 OR; 1.2-3.6 95 % CI; p=0.003) were associated with being overweight and being obese. Weight-control drug use was a protective factor in both genders (0.4 OR; 0.2-0.8 95 % CI; p=0.01); diet control was only a protective factor in women (2.2. OR; 1.1-3.4 95 % CI; p=0.01). 31.6 % of university students were overweight and suffered from obesity. Smoking and alcoholism in males were associated with being overweight and suffering from obesity. Weight-control and diet-control drug use were protective factors.

  19. Full 3D modelling of pulse propagation enables efficient nonlinear frequency conversion with low energy laser pulses in a single-element tripler.

    Science.gov (United States)

    Kardaś, Tomasz M; Nejbauer, Michał; Wnuk, Paweł; Resan, Bojan; Radzewicz, Czesław; Wasylczyk, Piotr

    2017-02-22

    Although new optical materials continue to open up access to more and more wavelength bands where femtosecond laser pulses can be generated, light frequency conversion techniques are still indispensable in filling the gaps on the ultrafast spectral scale. With high repetition rate, low pulse energy laser sources (oscillators) tight focusing is necessary for a robust wave mixing and the efficiency of broadband nonlinear conversion is limited by diffraction as well as spatial and temporal walk-off. Here we demonstrate a miniature third harmonic generator (tripler) with conversion efficiency exceeding 30%, producing 246 fs UV pulses via cascaded second order processes within a single laser beam focus. Designing this highly efficient and ultra compact frequency converter was made possible by full 3-dimentional modelling of propagation of tightly focused, broadband light fields in nonlinear and birefringent media.

  20. [The frequency of burnout syndrome in physicians in Mostar University Hospital].

    Science.gov (United States)

    Vukojević, Mladenka; Brzica, Jerko; Petrov, Bozo

    2014-01-01

    To determine the prevalence of burnout syndrome in clinical physicians in Mostar University Hospital. The study included 94 subjects who were familiar with the purpose of research and were classified into three specialty groups. The first consisted of doctors in the Department of Internal Medicine and Department of Pediatrics, the second group of doctors in the Department of Surgery and Department of Gynecology and Obstetrics, while the third group (CL-specialization) were doctors of the Clinic of Dermatology and Venereal Diseases, Department of Otorhinolaryngology and Department of Ophthalmology. All subjects were handed anonymous questionnaire to assess burnout. The questionnaire consisted of 18 statements with numbers from 1 to 3, 1 meaning rarely, 2 often and 3 always The task was to circle an appropriate number depending on how the statement described them. Along with these statements the questionnaire contained information on the place of employment, years of work experience and gender. In the studied sample of respondents most (n = 81, 86.2%) didn't have symptoms of burnout syndrome. As for the people who had these symptoms, they all belonged to the moderate intensity (chi2 test = 49.19, df = 1, P syndrome. The intensity of the symptoms in the subjects was not significantly different between males and females (chi2 test = 0.85, df = 1, P = 0.355). Also, the intensity of symptoms in the subjects did not differ significantly depending on the number of working years (exact test, P = 0.888). After the formation of three groups from seven departments involved in the research of so far perceived intensity of stress, no significant differences in the intensity of the symptoms of burnout were found between them (exact test, P = 0.536). Regarding the individual items in the overall survey sample, in five items high intensity symptoms of burnout were most often circled. The most frequently reported high intensity of the symptoms was the sense of inability to change

  1. university

    Directory of Open Access Journals (Sweden)

    Elena Grigoryeva

    2015-05-01

    Full Text Available Universities occupy a special place in the city’s life, the place where centuries-old traditions of the past meet the future. Universities keep their ancestral roots stretching back into the Middle Ages. University rooms and laboratories are the places where the future of science and society is built and discussed.The oldest Siberian University located in Tomsk was included in the City Charter as a city-forming enterprise. Other Siberian cities have not yet come to such deep comprehension of the role of universities. But who can doubt the significance and beneficence of this role?A complex and debatable process of reformation of the Russian higher education has been going on for several decades. Many things are perceived painfully. Irkutsk has been a student city for a long time and ranked second in the percentage of students among citizens. But recently we have lost Irkutsk High Military Aviation Engineering School, nearly lost the MIA High School. Pedagogical University has lost its status of university, and then its independence. Linguistic University has turned into a branch of Moscow University…Besides, external threats still exist and even grow. The lands and the buildings of universities are of keen interest among big businessmen, speculators and developers… Isn’t it the reason why the ideas to evacuate universities to suburban campuses arise increasingly frequently?What is the impact of dislocation of universities out of the city historical center? Does it make the city poorer and older? Or safer and more manageable? As usual, we tried to show the challenge and diversity of the main topic of the issue.

  2. Frequency of Dental Implants Placed in the Esthetic Zone in Dental Clinic of Tehran University: A Descriptive Study

    Directory of Open Access Journals (Sweden)

    Amir Alireza Rasouli Ghahroudi

    2016-08-01

    Full Text Available Objectives: Anterior maxilla, known as the esthetic zone, plays an important role in facial and smile esthetics. This study assessed the frequency of implant treatments in the esthetic zone of patients presenting to Dental Implant Department of Tehran University during 2002-2012.Materials and Methods: This descriptive study was conducted on dental records of patients receiving implant treatment during 2002-2012. Patient records were retrieved from the archives and patient demographics, implant characteristics, failure rate, prevalence of complications and implant systems were collected. The data were reported as frequency and percentage.Results: Of a total of 2,381 implants placed in the mentioned time period, 492 (20.8% had been placed in the anterior maxilla and 531 (22.3% had been placed in the anterior mandible from canine to canine.  Timing of implant placement was immediate in 12.0%, early in 0.5% and late in 87.4%. Survival rate was 99.1%. Rate of failure was 0.8%. Failure rate was 0.4% in the maxillary and 1.1% in the mandibular canine to canine region. Complications were reported in 10.1% of patients. Rate of complications was 18.3% in the maxillary canine to canine, 8.9% in the mandibular canine to canine, 18.1% in the maxillary first premolar to first premolar and 9.5% in the mandibular first premolar to first premolar. The frequency of bone grafts placed in these areas was 17.6%, 33.9%, 13.6%, 32.1% and 14.3%, respectively.Conclusion: Of implants placed in our center, around 20% were in the anterior maxilla, and delayed implant placement was the most commonly adopted technique.

  3. Nordic Housing Enabler

    DEFF Research Database (Denmark)

    Helle, Tina; Brandt, Åse

    2009-01-01

    , however, the built environment shows serious deficits when it comes to accessibility. This study addresses development of a content valid cross-Nordic version of the Housing Enabler and investigation of inter-rater reliability, when used in occupational therapy practice. The instrument was translated from...... statistics. Overall good percentage agreement for all parts of the instrument was shown, indicating that the Nordic Housing Enabler is sufficiently reliable for application in practice and research in the Nordic context. The kappa results varied and possible explanations are discussed, which should be kept......Development and reliability testing of the Nordic Housing Enabler – an instrument for accessibility assessment of the physical housing. Tina Helle & Åse Brandt University of Lund, Health Sciences, Faculty of Medicine (SE) and University College Northern Jutland, Occupational Therapy department (DK...

  4. Science with a lunar low-frequency array: From the dark ages of the Universe to nearby exoplanets

    Science.gov (United States)

    Jester, Sebastian; Falcke, Heino

    2009-05-01

    Low-frequency radio astronomy is limited by severe ionospheric distortions below 50 MHz and complete reflection of radio waves below 10-30 MHz. Shielding of man-made interference from long-range radio broadcasts, strong natural radio emission from the Earth's aurora, and the opportunity to set up a large distributed antenna array make the lunar far side a supreme location for a low-frequency radio array. A number of new scientific drivers for such an array, such as the study of the dark ages and epoch of reionization, exoplanets, and ultra-high energy cosmic rays, have emerged and need to be studied in greater detail. Here we review the scientific potential and requirements of these new scientific drivers and discuss the constraints for various lunar surface arrays. In particular, we describe observability constraints imposed by the interstellar and interplanetary medium, calculate the achievable resolution, sensitivity, and confusion limit of a dipole array using general scaling laws, and apply them to various scientific questions. Of particular interest for a lunar array are studies of the earliest phase of the universe which are not easily accessible by other means. These are the epoch of reionization at redshifts z = 6-20, during which the very first stars and galaxies ionized most of the originally neutral intergalactic hydrogen, and the dark ages prior to that. For example, a global 21-cm wave absorption signature from primordial hydrogen in the dark ages at z = 30-50 could in principle be detected by a single dipole in an eternally dark crater on the moon, but foreground subtraction would be extremely difficult. Obtaining a high-quality power spectrum of density fluctuations in the epoch of reionization at z = 6-20, providing a wealth of cosmological data, would require about 103-105 antenna elements on the moon, which appears not unreasonable in the long term. Moreover, baryonic acoustic oscillations in the dark ages at z = 30-50 could similarly be detected

  5. DOE SciDAC’s Earth System Grid Center for Enabling Technologies Final Report for University of Southern California Information Sciences Institute

    Energy Technology Data Exchange (ETDEWEB)

    Chervenak, Ann Louise [Univ. of Southern California Information Sciences Inst., Marina del Rey, CA (United States)

    2013-12-19

    The mission of the Earth System Grid Federation (ESGF) is to provide the worldwide climate-research community with access to the data, information, model codes, analysis tools, and intercomparison capabilities required to make sense of enormous climate data sets. Its specific goals are to (1) provide an easy-to-use and secure web-based data access environment for data sets; (2) add value to individual data sets by presenting them in the context of other data sets and tools for comparative analysis; (3) address the specific requirements of participating organizations with respect to bandwidth, access restrictions, and replication; (4) ensure that the data are readily accessible through the analysis and visualization tools used by the climate research community; and (5) transfer infrastructure advances to other domain areas. For the ESGF, the U.S. Department of Energy’s (DOE’s) Earth System Grid Center for Enabling Technologies (ESG-CET) team has led international development and delivered a production environment for managing and accessing ultra-scale climate data. This production environment includes multiple national and international climate projects (such as the Community Earth System Model and the Coupled Model Intercomparison Project), ocean model data (such as the Parallel Ocean Program), observation data (Atmospheric Radiation Measurement Best Estimate, Carbon Dioxide Information and Analysis Center, Atmospheric Infrared Sounder, etc.), and analysis and visualization tools, all serving a diverse user community. These data holdings and services are distributed across multiple ESG-CET sites (such as ANL, LANL, LBNL/NERSC, LLNL/PCMDI, NCAR, and ORNL) and at unfunded partner sites, such as the Australian National University National Computational Infrastructure, the British Atmospheric Data Centre, the National Oceanic and Atmospheric Administration Geophysical Fluid Dynamics Laboratory, the Max Planck Institute for Meteorology, the German Climate Computing

  6. Kinetics of electrons and neutral particles in radio-frequency transformer coupled plasma H- ion source at Seoul National University

    Science.gov (United States)

    Chung, K. J.; Dang, J. J.; Kim, J. Y.; Cho, W. H.; Hwang, Y. S.

    2016-10-01

    In volume production H- ion sources, control of electron temperature is essential due to its close correlation with the generation of vibrationally-excited hydrogen molecules in the driver region as well as the generation of H- ions by dissociative attachment in the extraction region. In the ion source group at Seoul National University (SNU) in Korea, a lot of research effort has been made to the development of a volume production H- ion source based on radio-frequency (RF) transformer-coupled plasma (TCP) for long lifetime continuous wave (CW) operation. It has a spiral RF antenna located outside the discharge chamber to generate a plasma with high electron temperature in the driver region and employs a magnetic filter field to prevent high energy electrons from being transported to the extraction region. In this paper, we present the recent progress on understanding of the underlying physics of the RF TCP H- ion source at SNU. Special attention is paid to the characterization of electron kinetics regime for controlling electron energy distribution and the influence of relaxation of neutral particles during the transport across the magnetic filter region. Effect of the degree of dissociation on the production of H- ions is also discussed.

  7. The history of low frequency radio astronomy in Australia. 7: Philip Hamilton, Raymond Haynes and the University of Tasmania's Penna Field Station near Hobart

    Science.gov (United States)

    George, Martin; Orchiston, Wayne; Wielebinski, Richard

    2017-04-01

    Following initial experiments near Hobart by Graeme Ellis, Grote Reber and Gordon Newstead from 1955 to 1957, the University of Tasmania established several sites for the study of low frequency radio astronomy, beginning in 1961. This paper describes the antenna array that was constructed at Penna, to the east northeast of Hobart. Between 1962 and 1967 it was used to produce maps of the southern sky at the frequencies of 4.7 and 10.02 MHz and contributed to an overall study of the low frequency emission from the Galaxy. Because of the proximity of the array to the town of Sorell, it was also referred to the 'Sorell Radio Telescope'.

  8. Paper and pencil vs online self-administered food frequency questionnaire (FFQ) applied to university population: a pilot study.

    Science.gov (United States)

    González Carrascosa, R; García Segovia, P; Martínez Monzó, J

    2011-01-01

    To test the reliability of dietary intake data measured with an online food frequency questionnaires (FFQ) applied to a university population by comparing the results with those from a paper and pencil version. A total of 50 students were recruited from the second-year Food Technology course at the Universitat Politècnica de València (Comunidad Valenciana, Spain) in the academic year 2008-2009. The students were between the ages of 20-32. The participants completed both presentation modes of the FFQ (paper and pencil and online) in a cross-over study with a time interval of 3-week. To study the effect of ordering of the questionnaires, participants were randomly assigned to group A (paper and pencil FFQ first) and group B (online FFQ first). Both self-administered semi-quantitative presentations of the FFQ included 84 food items divided into six groups (dairy products; eggs, meat and fish; vegetables, legumes and fruits; bread, cereals and similar; oils, fats and sweets; beverages and pre-cooked). Participants were asked how frequently and how much each food item they had consumed in the previous year. The response rate was 78% (39 students, 23% men and 77% women). For the total sample, the median dietary intakes were higher for the paper and pencil FFQ than the online version for energy (2,077 vs. 1,635 kcal/day), proteins (96 vs. 88 g/day), carbohydrates (272 vs. 211 g/day), and fat (70 vs. 58 g/day), respectively. These differences were statistically significant. However, there were not significant differences between the two presentations when the consumption by groups of food was calculated, except for "beverages and pre-cooked" group. The pilot testing showed that this online FFQ is a useful tool for estimating the intake of food groups in this university population. On the other hand, the differences found in the results of the absolute quantities of energy and nutrients intakes were not clear. These differences could be due to the problems that the

  9. Effect of Shift Work on the Frequency of Depression in Nursing Staff of Yazd University of Medical Sciences

    Directory of Open Access Journals (Sweden)

    Gholam Hossein Halvani

    2012-12-01

    Full Text Available Introduction: Depression as a disorder is relatively common in all societies; several factors are involved in depression development, that shift work is one of these factors. This study compared the frequency of depression in different shifts of nurses in hospitals of Yazd University of medical sciences. Materials & Methods: This study is a descriptive analytical study. Based on statistical methods, 150 nurses participated in this study. The research tool was a questionnaire that included 15 personal questions and 21 questions related to Beck test. The results were analysed by SPSS software. Results: 13.3% of all subjects were males and 86.7% were females. Results showed that, there is no significant relationship between gender, education, type of job, employment status and satisfaction levels of income with depression. Marital status (P-Value = 0.009 and F = 6.93, shift work (day working and shift work (P-Value = 0.032 and F = 1.11, job satisfaction (P-Value = 0.000 and F = 7.641 and the satisfaction of the employer (P-Value = 0.001 and F = 5.414 were significantly associated with depression. 3.49% of the nurses were in normal status, 7.26% had mild depression, 3.9% required consultation with the psychiatrist,% 7.8% suffered from moderate depression, 75.4% from severe depression and 3.1% from very severe depression. Conclusion: It seems that shift work can not cause depression alone, but depression is the result of the interaction of several factors.

  10. Universe

    CERN Document Server

    2009-01-01

    The Universe, is one book in the Britannica Illustrated Science Library Series that is correlated to the science curriculum in grades 5-8. The Britannica Illustrated Science Library is a visually compelling set that covers earth science, life science, and physical science in 16 volumes.  Created for ages 10 and up, each volume provides an overview on a subject and thoroughly explains it through detailed and powerful graphics-more than 1,000 per volume-that turn complex subjects into information that students can grasp.  Each volume contains a glossary with full definitions for vocabulary help and an index.

  11. Universe

    CERN Document Server

    2011-01-01

    Updated for 2011, the Universe, is one book in the Britannica Illustrated Science Library Series that covers today's most popular science topics, from digital TV to microchips to touchscreens and beyond. Perennial subjects in earth science, life science, and physical science are all explored in detail. Amazing graphics-more than 1,000 per title-combined with concise summaries help students understand complex subjects. Correlated to the science curriculum in grades 5-9, each title also contains a glossary with full definitions for vocabulary.

  12. The Medium Resolution Survey Spectrometer (MRSS) for the Origins Space Telescope: Enabling 3-D Surveys of the Universe in the Far-IR.

    Science.gov (United States)

    Bradford, Charles Matt; Origins Space Telescope Study Team

    2018-01-01

    The Medium-Resolution Survey Spectrometer (MRSS) is a multi-purpose wideband spectrograph being designed for the Origins Space Telescope (OST -- the NASA-funded far-IR flagship mission study being prepared for the 2020 Decadal Survey). The sensitivity possible with the combination of the actively-cooled OST telescope and new-generation far-IR direct detector arrays is outstanding; potentially offering a 10,000x improvement in speed over the Herschel, SOFIA for point-source measurements, and factor of more than 1,000,000 for spatial-spectral mapping. Massive galaxy detection rates are possible via the rest-frame mid- and far-IR spectral features, overcoming continuum confusion and reaching back to the epoch of reionization. The MRSS covers the full 30 to 670 micron band instantaneously at a resolving power (R) of 500 using 6 logarithmically-spaced grating modules. Each module couples at least 60 and up to 200 spatial beams simultaneously, enabling true 3-D spectral mapping, both for the blind extragalactic surveys and for mapping all phases of interstellar matter in the Milky Way and nearby galaxies. Furthermore, a high-resolution mode inserts a long-path Fourier-transform interferometer into the light path in advance of the grating backends, enabling R up to 38,000 x [100 microns / lambda], while preserving the basic grating sensitivity for line detection.Maximum scientific return with the MRSS on OST will require large arrays of direct detectors with sensitivity meeting or exceeding the photon background limit due to zodiacal and Galactic dust: NEP~3e-20 W/sqrt(Hz). The total pixel count for all 6 bands is ~200,000 pixels. These sensitive far-IR detector arrays are not provided by the kind of industrial efforts producing the the optical and near-IR detectors, but they are being developed by NASA scientists, including OST team members. We outline the rapid progress in this area, briefly highlighting a) recent low-NEP single-pixel measurements which meet the

  13. Association Between Exercise Frequency and Health Care Costs Among Employees at a Large University and Academic Medical Center.

    Science.gov (United States)

    Caretto, David C; Ostbye, Truls; Stroo, Marissa; Darcey, Dennis J; Dement, John

    2016-12-01

    The aim of this study was to evaluate the relationship between exercise frequency and health care costs associated with medical and pharmacy claims among a 10-year employee cohort. The relationship between self-reported exercise (days/week) and health care costs was analyzed with negative binomial regression, using an integrated database involving 32,044 person-years and linking employee demographics, health risk appraisal information, and health insurance claims. An association demonstrating exercise frequency lowering health care costs was present in most medical and prescription drug categories and was strongest among employees reporting 2 to 3 and 4 to 5 days/week of exercise. Increased exercise was associated with statistically significant reductions in endocrine disease costs and gastrointestinal prescription drug costs. This cohort demonstrates lower health care costs in employee populations when exercise frequency is increased. Employers may lower modifiable risk factors for chronic disease and reduce health care costs by promoting exercise among their employee population.

  14. Universal and Nonuniversal Dynamical Conductivity in Small Metallic Grains: An Ambivalent Role of T-Invariance at Finite Frequency

    Directory of Open Access Journals (Sweden)

    Nobuhiko Taniguchi

    2010-01-01

    and quantum interference. We clarify an ambivalent role of the time-reversal invariance at finite frequency by a new invariant analysis respecting the symmetry of the effective field theory. A subtlety of the operator insertion, and the fast-slow mode separation within the effective field description is pointed out.

  15. Histopathological frequency of perianal neoplasms in dogs: casuistry of the Veterinary Pathology Laboratory of the National University of San Marcos (2005-2012)

    OpenAIRE

    Vicente R., Karla; Laboratorio de Histología, Embriología y Patología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Perales C., Rosa; Laboratorio de Histología, Embriología y Patología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Tabacchi N., Luis; Laboratorio de Histología, Embriología y Patología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima. Perú

    2015-01-01

    The aim of this study was to determine the frequency of perianal neoplasms in dogs from samples histopathologically diagnosed in the Animal Pathology Laboratory of the National University of San Marcos in the period 2005 to 2012. A total of 52 cases of perianal tumors were diagnosed in 1283 cases of canine tumors (4.1%). The hepatoid gland adenoma was the most frequent (46.2%, 24/52). El objetivo del presente estudio fue determinar la frecuencia de neoplasias perianales en caninos mediante...

  16. An investigation on the frequency of partial prosthesis classification in dental faculty, Shiraz University of Medical Sciences

    Directory of Open Access Journals (Sweden)

    Zand S

    2002-06-01

    Full Text Available Tooth loss is a kind of handicap and losing a number of teeth makes an individual susceptible to this disability. Having knowledge about the prevalence of partial tooth loss, provides us with a better understanding of social hygiene. On the other hand, having access to such an information, students can be led properly to treat more prevalent cases. The goal of this retrospective study is to investigate the frequency of partial prosthesis classifications, among patients, referred to Shiraz dental faculty. Sexuality, tooth loss classification and its reason and the presence of additional space were studied about all patients (371 females, 205 males from (97-98 to the end of (99-2000. The results showed that females were more than males (64.4%, the lower jaw was treated more than the upper jaw (67.9%, dental caries were the most important reason for extraction (55.5%, class I among females (28.79% and class II mod I among males (29.73% had the most frequency, meaning that the most cases were free end, so more attention should be paid for the education of free end partial prosthesis, however, preventive steps should be taken to retain abutment teeth.

  17. Bone mineral density status and frequency of osteoporosis and clinical fractures in 155 patients with psoriatic arthritis followed in a university hospital.

    Science.gov (United States)

    Busquets, Noemi; Vaquero, Carmen Gómez; Moreno, Jesús Rodríguez; Vilaseca, Daniel Roig; Narváez, Javier; Carmona, Loreto; Nolla, Joan M

    2014-01-01

    To assess the bone mineral density (BMD) and the frequency of osteoporosis and clinical fractures in a large group of Spanish patients with psoriatic arthritis (PsA). BMD was determined by DXA in all the patients who were willing to participate and had peripheral PsA regularly evaluated in a tertiary university hospital. All patients underwent a physical examination and general laboratory analysis. We gathered demographic and clinical variables related with BMD and risk of fractures. We also recorded the history of clinical low impact fractures. The population of reference to calculate T-score and Z-score came from a Spanish database. One hundred and fifty-five patients were included (64 postmenopausal women, 26 premenopausal women and 65 men). The clinical forms of PsA were: 46% oligoarticular and 54% polyarticular. Mean disease duration was 13.7±9.4 years and mean ESR was 21.8±13.9mm/h; 66% of patients had received glucocorticoid treatment. We found no differences in BMD status between the patients and the Spanish general population, neither in the whole series nor in each defined subgroup. Frequency of osteoporosis was 16%; it was higher in postmenopausal women (28%) than in men (9%) or premenopausal women (4%). Frequency of clinical fractures was 13%; it accounted specially in postmenopausal women. The magnitude of the problem of osteoporosis in PsA seems to be mild. Copyright © 2013 Elsevier España, S.L. All rights reserved.

  18. Review of frequency of dysmenorrhea and some associated factors and evaluation of the relationship between dysmenorrhea and sleep quality in university students.

    Science.gov (United States)

    Sahin, Sevil; Ozdemir, Kevser; Unsal, Alaattin; Arslan, Refika

    2014-01-01

    To determine the frequency of dysmenorrhea in university students, review some associated factors and evaluate the relationship between dysmenorrhea and sleep quality. The study group included 520 students. Survey forms prepared previously in line with the study objective were completed by the students under supervision. The severity of dysmenorrhea was rated with Visual Analogue Scale. Pittsburgh Sleep Quality Index was used to evaluate the sleep quality. The χ(2) test, Mann-Whitney U test and Kruskal-Wallis test were used for the analyses. Statistical significance level was accepted at p students was 20.23 ± 1.59 years (range 17-25). Frequency of dysmenorrhea was determined to be 69.0% (n = 359). Frequency of dysmenorrhea was higher in smokers, those with menstrual irregularity, those who use drugs for menstrual regulation and those having a family history (p Sleep quality was found to be poorer in the students having a history of dysmenorrhea (p sleep quality negatively. © 2014 S. Karger AG, Basel.

  19. The Frequency of Heartburn (GERD and Its Related Factors in the Students of Hamadan University of Medical Sciences

    Directory of Open Access Journals (Sweden)

    A.R. Khalilian

    2013-10-01

    Full Text Available Introduction & Objective: Gastro-esophageal acid reflux disease (GERD is the most common disease of the digestive system in the world and Iran. The main Symptom of GERD is heart-burn. GERD reduces the quality of life and leads to esophageal adenocarcinoma. The aim of this study was to determine the prevalence of heartburn in students of Hamadan University of Medical Sciences. Materials & Methods: This study was a cross-sectional descriptive study on 388 randomly se-lected students. They had the inclusion criteria. The survey tool included questionnaire (demographic questions and symptoms of heartburn and acid regurgitation. Data were ana-lyzed with descriptive statistics. Chi square and t- tests were used to examine the relation-ships between variables. Results: Out of the 388 students, 270 (69.6% reported symptoms of heartburn. The relation-ship of BMI, sex, marital status, body mass index, ethnicity of individuals, fruits and fresh vegetables, and most food with heartburn was not significant (P> 0.05but the relationship was significant with age, smoking and smoking hookah, the college, semester, tea consump-tion and pickles, spices, smoked and canned foods, soft drinks and high-fat (P <0.05. Conclusion: A lot of people in this study had heartburn. But they were not concerned about its cause and suitable treatment. (Sci J Hamadan Univ Med Sci 2013; 20 (3:232-239

  20. Investigation of Positional Differences in Fitness of Male University Ice Hockey Players and the Frequency, Time Spent and Heart Rate of Movement Patterns during Competition

    Directory of Open Access Journals (Sweden)

    Joel Jackson

    2017-07-01

    Full Text Available Background:  Men’s university ice hockey has received little scientific attention over the past 30 years, a time in which the traits of the players and the demands of the game have evolved.  Objectives: This study compared the physiological characteristics of university ice hockey players and examined the frequency and duration of the different movement patterns and heart rate (HR responses during competition. Methods: Twenty male ice hockey players from the same team ( age ± SD = 22±2 years underwent a fitness evaluation and were filmed and HR monitored during regular season games. Results: Forwards and defense had similar fitness and only differed on % fatigue index and peak heart during on-ice sprinting (P<0.05. Defense stood, glided and skated backwards more than forwards and forwards skated at a moderate intensity and glided forward more than defense (P<0.05. All players spent the majority of game time gliding forward (60% of the time followed by skating forward at a moderate intensity (17% and standing with little movement (9%. Average HR during the game reached 96 and 92 % and peak HR was 100 and 96 % of maximum in forwards and defense, respectively. Conclusions: Male university hockey players present with a high level of physical fitness in a variety of categories with few differences between forwards and defense. Movement patterns during games suggest that players are performing low to moderate intensity on-ice activities the majority of the time. Paradoxically, HR continues to climb to near maximum during on ice shifts.

  1. The Frequency of Different Types of Primary Teeth Discoloration in Children in Paediatric Department of Faculty of Dentistry, Tehran University of Medical Sciences, In 1999-2001

    Directory of Open Access Journals (Sweden)

    J. Mahmoodian

    2004-06-01

    Full Text Available Statement of Problem: Primary teeth discoloration can cause mentally and socially unpleasant effects in children. This can also be a sign of systemic disease. Despite the importance of this subject, a comprehensive study has not been performed yet.Purpose: The aim of this study was determining the frequency of different types of primary teeth discoloration.Materials and Methods: In this cross-sectional study 260 cases whom were referred to department of paediatric, faculty of dentistry, Tehran University of Medical Science, 1999-2001 were examined. All of these children were examined for any discoloration beforestarting any treatment then the type of discoloration was determined after polishing. Then the relationship between gender and these changes were evaluated by chi-square test.Results: In 59 cases (22.7% abnormal color was detected. 10 patients (3.9% had intrinsic stain and in 15 children (5.8% extrinsic color was discovered. 34 children (13% had bothtypes.Conclusion: In this survey the correlation between tooth discoloration (and its types and gender was not statistically significant.

  2. 12-month follow-up of an exploratory ‘brief intervention’ for high-frequency cannabis users among Canadian university students

    Directory of Open Access Journals (Sweden)

    Fischer Benedikt

    2012-04-01

    Full Text Available Abstract Background One in three young people use cannabis in Canada. Cannabis use can be associated with a variety of health problems which occur primarily among intensive/frequent users. Availability and effectiveness of conventional treatment for cannabis use is limited. While Brief Interventions (BIs have been shown to result in short-term reductions of cannabis use risks or problems, few studies have assessed their longer-term effects. The present study examined 12-month follow-up outcomes for BIs in a cohort of young Canadian high-frequency cannabis users where select short-term effects (3 months had previously been assessed and demonstrated. Findings N = 134 frequent cannabis users were recruited from among university students in Toronto, randomized to either an oral or a written cannabis BI, or corresponding health controls, and assessed in-person at baseline, 3-months, and 12-months. N = 72 (54 % of the original sample were retained for follow-up analyses at 12-months where reductions in ‘deep inhalation/breathholding’ (Q = 13.1; p  Conclusions The results confirm findings from select other studies indicating the potential for longer-term and sustained risk reduction effects of BIs for cannabis use. While further research is needed on the long-term effects of BIs, these may be a valuable – and efficient – intervention tool in a public health approach to high-risk cannabis use.

  3. Organising to Enable Innovation

    DEFF Research Database (Denmark)

    Brink, Tove

    2016-01-01

    The purpose of this conceptual paper is to reveal how organising can enable innovation across organisational layers and organisational units. This approach calls for a cross-disciplinary literature review. The aim is to provide an integrated understanding of innovation in an organisational approach....... The findings reveal a continous organising process between individual/ team creativity and organisational structures/control to enable innovation at firm level. Organising provides a dynamic approach and contains the integrated reconstruction of creativity, structures and boundaries for enhanced balance...... of explorative and exploitative learning in uncertain environments. Shedding light on the cross-disciplinary theories to organise innovation provides a contribution at the firm level to enable innovation....

  4. Frequency of Iatrogenic damage to adjacent tooth during class II cavity preparation among dental students at Tehran University of Medical Sciences in 2010

    Directory of Open Access Journals (Sweden)

    Reza Yazdani

    2013-08-01

    Full Text Available   Background and Aims: Iatrogenic damage to adjacent tooth during proximal cavity preparation is one of the most common side effects in operative dentistry. The aim of this study was to determine prevalence of iatrogenic damages to adjacent tooth during the preparation of proximal Class II cavities among undergraduate students at dental faculty of Tehran University of Medical Sciences in 2010 .   Materials and Methods: 106 posterior permanent teeth which had Class II decay with sound proximal surfaces of adjacent teeth were selected and restored by dental students awarding the aims of the present study. After finishing restoration, proximal surfaces were completely dried by air and evaluated with dental chair light. In doubtful cases, surfaces were evaluated with × 3 magnification. Damages were classified into 2 groups; abrasion and groove. Data were analyzed using Fishers exact and Pearson chi square tests .   Results: The frequency of adjacent surfaces damage were 57.5%, with 31.1% damages as abrasion and 26.4% as groove. Students who used matrix band and wedge in proximal area as preventive instruments showed 53.4% damages and other students showed 57.3% damages (P>0.05. A significantly higher number of females and students at restorative course level (3 used wedge and matrix band than males and students at restorative course level (4 for protecting adjacent teeth (P<0.05.   Conclusion: According to the high percentage of iatrogenic damages on adjacent sound teeth in class II cavity preparation, teaching of preventive methods and using proper techniques is necessary for dental students as future dentists.

  5. Dynamics-Enabled Nanoelectromechanical Systems (NEMS) Oscillators

    Science.gov (United States)

    2014-06-01

    AFRL-RY-WP-TR-2014-0144 DYNAMICS-ENABLED NANOELECTROMECHANICAL SYSTEMS ( NEMS ) OSCILLATORS Michael Roukes California Institute...SYSTEMS ( NEMS ) OSCILLATORS 5a. CONTRACT NUMBER FA8650-10-1-7029 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 61101E 6. AUTHOR(S) Michael Roukes...engineer, and demonstrate nonlinear-dynamics-enabled nanoelectromechanical system ( NEMS ) frequency-source technology. 15. SUBJECT TERMS

  6. The Nordic Housing Enabler

    DEFF Research Database (Denmark)

    Helle, T.; Nygren, C.; Slaug, B.

    2014-01-01

    This study addresses development of a content-valid cross-Nordic version of the Housing Enabler and investigation of its inter-rater reliability when used in occupational therapy rating situations, involving occupational therapists, clients, and their home environments. The instrument...... was translated from the original Swedish version of the Housing Enabler, and adapted according to accessibility norms and guidelines for housing design in Sweden, Denmark, Finland, and Iceland. This iterative process involved occupational therapists, architects, building engineers, and professional translators...... Enabler. Inter-rater reliability was calculated by means of percentage agreement and kappa statistics. Overall good percentage agreement for the personal and environmental components of the instrument was shown, indicating that the instrument was sufficiently reliable for application in practice...

  7. The Nordic Housing Enabler

    DEFF Research Database (Denmark)

    Helle, Tina; Slaug, Bjørn; Brandt, Åse

    2010-01-01

    This study addresses development of a content valid cross-Nordic version of the Housing Enabler and investigation of its inter-rater reliability when used in occupational therapy rating situations, involving occupational therapists, clients and their home environments. The instrument was translated...... from the original Swedish version of the Housing Enabler, and adapted according to accessibility norms and guidelines for housing design in Sweden, Denmark, Finland and Iceland. This iterative process involved occupational therapists, architects, building engineers and professional translators...... Enabler. Inter-rater reliability was calculated by means of percentage agreement and kappa statistics. Overall good percentage agreement for the personal and environmental components of the instrument was shown, indicating that the instrument was sufficiently reliable for application in practice...

  8. Waveform frequency notching

    Energy Technology Data Exchange (ETDEWEB)

    Doerry, Armin W.; Andrews, John

    2017-05-09

    The various technologies presented herein relate to incorporating one or more notches into a radar spectrum, whereby the notches relate to one or more frequencies for which no radar transmission is to occur. An instantaneous frequency is monitored and if the frequency is determined to be of a restricted frequency, then a radar signal can be modified. Modification can include replacing the signal with a signal having a different instantaneous amplitude, a different instantaneous phase, etc. The modification can occur in a WFS prior to a DAC, as well as prior to a sin ROM component and/or a cos ROM component. Further, the notch can be dithered to enable formation of a deep notch. The notch can also undergo signal transitioning to enable formation of a deep notch. The restricted frequencies can be stored in a LUT against which an instantaneous frequency can be compared.

  9. Pilot project as enabler?

    DEFF Research Database (Denmark)

    Neisig, Margit; Glimø, Helle; Holm, Catrine Granzow

    This article deals with a systemic perspective on transition. The field of study addressed is a pilot project as enabler of transition in a highly complex polycentric context. From a Luhmannian systemic approach, a framework is created to understand and address barriers of change occurred using...

  10. BPR - Enabled Systems Engineering

    OpenAIRE

    Johnson, Leslie; Stergiou, Maria

    1999-01-01

    As traditional management techniques were no longer appropriate in the changing business environment, companies employed Business Process Reengineering (BPR) to achieve elevated business performance. Similarly, as traditional systems development approaches delivered disappointing results, system developers experimented with other models, including Evolutionary Delivery and Evolutionary Development, in order to enable successful technology exploitation by businesses. Both these business and sy...

  11. Enabling distributed collaborative science

    DEFF Research Database (Denmark)

    Hudson, T.; Sonnenwald, Diane H.; Maglaughlin, K.

    2000-01-01

    To enable collaboration over distance, a collaborative environment that uses a specialized scientific instrument called a nanoManipulator is evaluated. The nanoManipulator incorporates visualization and force feedback technology to allow scientists to see, feel, and modify biological samples being...

  12. An Analysis of the Combination Frequencies of Constituent Medicinal Herbs in Prescriptions for the Treatment of Stroke in Korean Medicine: Determination of a Group of Candidate Prescriptions for Universal Use

    Directory of Open Access Journals (Sweden)

    Byeong Cheol Yun

    2016-01-01

    Full Text Available In contrast to Western medicine, which typically prescribes one medicine to treat a specific disease, traditional East Asian medicine uses any one of a large number of different prescriptions (mixtures of medicinal herbs, according to the patient’s characteristics. Although this can be considered an advantage, the lack of a universal prescription for a specific disease is considered a drawback of traditional East Asian medicine. The establishment of universally applicable prescriptions for specific diseases is therefore required. As a basic first step in this process, this study aimed to select prescriptions used in the treatment of stroke and, through the analysis of medicinal herb combination frequencies, select a high-frequency medicinal herb combination group for further experimental and clinical research. As a result, we selected some candidates of a medicinal herb combination and 13 candidates of a medicinal herb for the treatment of stroke.

  13. Spatially enabled land administration

    DEFF Research Database (Denmark)

    Enemark, Stig

    2006-01-01

    enabling of land administration systems managing tenure, valuation, planning, and development will allow the information generated by these activities to be much more useful. Also, the services available to private and public sectors and to community organisations should commensurably improve. Knowledge....... In other words: Good governance and sustainable development is not attainable without sound land administration or - more broadly – sound land management. The paper presents a land management vision that incorporates the benefits of ICT enabled land administration functions. The idea is that spatial...... the communication between administrative systems and also establish more reliable data due to the use the original data instead of copies. In Denmark, such governmental guidelines for a service-oriented ITarchitecture in support of e-government are recently adopted. Finally, the paper presents the role of FIG...

  14. Alta frecuencia de plagio en tesis de medicina de una universidad pública Peruana High frequency of plagiarism in medical thesis from a Peruvian public university

    Directory of Open Access Journals (Sweden)

    J. Jhan C. Saldaña-Gastulo

    2010-03-01

    Full Text Available Se realizó un estudio observacional con el objetivo de describir la presencia de plagio en tesis de medicina ejecutadas en el año 2008 en una universidad pública peruana. Se buscó plagio en las introducciones de 33 tesis usando un algoritmo de búsqueda con Google, se caracterizó el tipo de estudio y se buscó en forma electrónica si los asesores de las tesis han publicado artículos en revistas científicas. Se encontró evidencia de plagio en 27/33 de las introducciones, 37,3% (171/479 de todos los párrafos analizados tuvieron algún grado de plagio, el plagio literal fue el más frecuente (20/27 y las fuentes de plagio más comunes fueron revistas científicas (19/27. Las características de los estudios analizados fueron observacionales (32/33, transversales (30/33, descriptivos (25/33 y retrospectivos (19/33. Ninguno de los autores había publicado en una revista científica, y sólo nueve de sus asesores de ellos tenían al menos una publicación. No se encontró asociación entre las características de la tesis y la presencia de plagio. En conclusión, se encontró una alta frecuencia de plagio en las tesis analizadas. Es responsabilidad de las facultades de medicina tomar las medidas necesarias para detectar y evitar el plagio entre sus estudiantes.An observational study was conducted to describe the presence of plagiarism in medical thesis in 2008 performed at a public university in Peru. Search for plagiarism in 33 thesis introductions using a Google search algorithm, characterizes of the study type and we search in electronic form if the thesis mentor have published articles in scientific journals. We found evidence of plagiarism in 27/33 introductions, 37.3% (171/479 of all the paragraphs analyzed had some degree of plagiarism, literal plagiarism was the most frequent (20/27 and journals were the most common sources of plagiarism (19/27. The characteristics of the studies were observational (32/33, cross-sectional (30

  15. Enabling Wind Power Nationwide

    Energy Technology Data Exchange (ETDEWEB)

    Jose Zayas, Michael Derby, Patrick Gilman and Shreyas Ananthan,

    2015-05-01

    Leveraging this experience, the U.S. Department of Energy’s (DOE’s) Wind and Water Power Technologies Office has evaluated the potential for wind power to generate electricity in all 50 states. This report analyzes and quantifies the geographic expansion that could be enabled by accessing higher above ground heights for wind turbines and considers the means by which this new potential could be responsibly developed.

  16. ICT-Enabled Learning: The Student Perspective

    Science.gov (United States)

    Scott, Geoff; Grebennikov, Leonid; Gozzard, Terry

    2009-01-01

    This research seeks to contribute to current discussions in Australian higher education on how best to deploy ICT-enabled learning. Its particular focus is on examining the qualitative data from students on their experience of using Information and Communication Technologies (ICT) at one college in an Australian university. In total, about 71,240…

  17. Enabling Disabled Students.

    Science.gov (United States)

    Murphy, Diane Makar; Murphy, John T.

    1997-01-01

    The Americans with Disabilities Act requires reasonable accommodations for the disabled in public and private colleges and universities. Faculty must understand the difference between equal opportunity and equal treatment. Specific suggestions are made for teaching learning-disabled, mobility- impaired, visually-impaired, and hearing-impaired…

  18. EnableATIS strategy assessment.

    Science.gov (United States)

    2014-02-01

    Enabling Advanced Traveler Information Systems (EnableATIS) is the traveler information component of the Dynamic Mobility Application (DMA) program. The objective of : the EnableATIS effort is to foster transformative traveler information application...

  19. Sensation seeking and executive deficits in relation to alcohol, tobacco, and marijuana use frequency among university students: Value of ecologically based measures.

    Science.gov (United States)

    Meil, William M; LaPorte, David J; Mills, John A; Sesti, Ann; Collins, Sunshine M; Stiver, Alyssa G

    2016-11-01

    The development of substance use and addiction has been linked to impaired executive function which relies on systems that converge in the prefrontal cortex. This study examined several measures of executive function as predictors of college student alcohol, tobacco, and marijuana use frequency and abuse. College students (N=321) were administered the Delis-Kaplan Executive Function System (D-KEFS) test battery, the Sensation Seeking Scale V (SSSV), the Frontal Systems Behavioral Scale (FrSBe), the Perceived Stress Scale (PSS), the Michigan Alcohol Screening Test (MAST), the Fagerstrom Test of Nicotine Dependence (FTND). Alcohol use frequency was predicted by sensation seeking and FrSBe Disinhibition scores, but the latter only emerged as a unique predictor for binge drinking frequency. Sex and Disinhibition, Apathy and Executive Function FrSBe subscales predicted the frequency of tobacco use. FrSBe scores uniquely predicted tobacco use among daily users. Marijuana use frequency was predicted by sensation seeking, sex, perceived stress, and FrSBe Disinhibition scores, but only sensation seeking predicted daily use after controlling for other variables. FrSBe Disinhibition scores reached levels considered to be clinically significant for frequent binge drinkers and daily marijuana users. Sensation seeking emerged as the predominate predictor of the early stages of alcohol and tobacco related problems. These results suggest ecologically based self-report measures of frontal lobe function and sensation seeking are significant predictors of use frequency among college students and the extent of frontal dysfunction may be clinically significant among some heavy users. Copyright © 2016 Elsevier Ltd. All rights reserved.

  20. Enabling Digital Literacy

    DEFF Research Database (Denmark)

    Ryberg, Thomas; Georgsen, Marianne

    2010-01-01

    There are some tensions between high-level policy definitions of “digital literacy” and actual teaching practice. We need to find workable definitions of digital literacy; obtain a better understanding of what digital literacy might look like in practice; and identify pedagogical approaches, which...... support teachers in designing digital literacy learning. We suggest that frameworks such as Problem Based Learning (PBL) are approaches that enable digital literacy learning because they provide good settings for engaging with digital literacy. We illustrate this through analysis of a case. Furthermore......, these operate on a meso-level mediating between high-level concepts of digital literacy and classroom practice....

  1. Smart Grid Enabled EVSE

    Energy Technology Data Exchange (ETDEWEB)

    None, None

    2015-01-12

    The combined team of GE Global Research, Federal Express, National Renewable Energy Laboratory, and Consolidated Edison has successfully achieved the established goals contained within the Department of Energy’s Smart Grid Capable Electric Vehicle Supply Equipment funding opportunity. The final program product, shown charging two vehicles in Figure 1, reduces by nearly 50% the total installed system cost of the electric vehicle supply equipment (EVSE) as well as enabling a host of new Smart Grid enabled features. These include bi-directional communications, load control, utility message exchange and transaction management information. Using the new charging system, Utilities or energy service providers will now be able to monitor transportation related electrical loads on their distribution networks, send load control commands or preferences to individual systems, and then see measured responses. Installation owners will be able to authorize usage of the stations, monitor operations, and optimally control their electricity consumption. These features and cost reductions have been developed through a total system design solution.

  2. Frequency and Content of Chat Questions by Time of Semester at the University of Central Florida: Implications for Training, Staffing and Marketing

    Science.gov (United States)

    Goda, Donna; Bishop, Corinne

    2008-01-01

    The more than 4,000 "chats" received by the University of Central Florida's (UCF) Ask-A-Librarian digital reference service are the subject of this practitioner-based, descriptive case study. Question content from chats received during four semesters between January 2005 and May 2006 are categorized and plotted, by semester, to show the…

  3. Profile II--Teacher Education Students. Academic Year 1981-82. General Frequency Report. Report No. 4 in the Iowa State University Teacher Education Evaluation Project, August 1982.

    Science.gov (United States)

    Iowa State Univ. of Science and Technology, Ames. Research Inst. for Studies in Education.

    In 1979 the Research Institute for Studies in Education (RISE) began work to develop a comprehensive model for evaluating teacher education programs at Iowa State University. As an initial step in this comprehensive evaluation effort, RISE began compiling a profile of students in teacher education at the univesity. This profile includes…

  4. Enabling graphene nanoelectronics.

    Energy Technology Data Exchange (ETDEWEB)

    Pan, Wei; Ohta, Taisuke; Biedermann, Laura Butler; Gutierrez, Carlos; Nolen, C. M.; Howell, Stephen Wayne; Beechem Iii, Thomas Edwin; McCarty, Kevin F.; Ross, Anthony Joseph, III

    2011-09-01

    Recent work has shown that graphene, a 2D electronic material amenable to the planar semiconductor fabrication processing, possesses tunable electronic material properties potentially far superior to metals and other standard semiconductors. Despite its phenomenal electronic properties, focused research is still required to develop techniques for depositing and synthesizing graphene over large areas, thereby enabling the reproducible mass-fabrication of graphene-based devices. To address these issues, we combined an array of growth approaches and characterization resources to investigate several innovative and synergistic approaches for the synthesis of high quality graphene films on technologically relevant substrate (SiC and metals). Our work focused on developing the fundamental scientific understanding necessary to generate large-area graphene films that exhibit highly uniform electronic properties and record carrier mobility, as well as developing techniques to transfer graphene onto other substrates.

  5. The Frequency of Academic Burnout and Related Factors among Medical Students at Shahid Beheshti University of Medical Sciences, Tehran, in 2016

    OpenAIRE

    Hadi Azimi; Jamal Shams; Mohammad-Reza Sohrabi; Narges Malih

    2016-01-01

    Abstract  Background: Academic burnout is the state of negative emotions and low motivation in one’s education. Understanding the status of academic burnout is the primary step to make proper decisions. The present study, therefore, was conducted to investigate comparative degrees of academic burnout among medical students in their first five semesters of medical education at Shahid Beheshti University of Medical Sciences, Tehran, Iran.  Methods: In the present cross-sectional study, a total ...

  6. LOW FREQUENCY DAMPER

    Directory of Open Access Journals (Sweden)

    Radu BOGATEANU

    2009-09-01

    Full Text Available The low frequency damper is an autonomous equipment for damping vibrations with the 1-20Hz range.Its autonomy enables the equipment to be located in various mechanical systems, without requiring special hydraulic installations.The low frequency damper was designed for damping the low frequency oscillations occurring in the circuit controls of the upgraded IAR-99 Aircraft.The low frequency damper is a novelty in the aerospace field ,with applicability in several areas as it can be built up in an appropriate range of dimensions meeting the requirements of different beneficiaries. On this line an equipment able to damp an extended frequency range was performed for damping oscillations in the pipes of the nuclear power plants.This damper, tested in INCAS laboratories matched the requirements of the beneficiary.The low frequency damper is patented – the patent no. 114583C1/2000 is held by INCAS.

  7. Enabling immersive simulation.

    Energy Technology Data Exchange (ETDEWEB)

    McCoy, Josh (University of California Santa Cruz, Santa Cruz, CA); Mateas, Michael (University of California Santa Cruz, Santa Cruz, CA); Hart, Derek H.; Whetzel, Jonathan; Basilico, Justin Derrick; Glickman, Matthew R.; Abbott, Robert G.

    2009-02-01

    The object of the 'Enabling Immersive Simulation for Complex Systems Analysis and Training' LDRD has been to research, design, and engineer a capability to develop simulations which (1) provide a rich, immersive interface for participation by real humans (exploiting existing high-performance game-engine technology wherever possible), and (2) can leverage Sandia's substantial investment in high-fidelity physical and cognitive models implemented in the Umbra simulation framework. We report here on these efforts. First, we describe the integration of Sandia's Umbra modular simulation framework with the open-source Delta3D game engine. Next, we report on Umbra's integration with Sandia's Cognitive Foundry, specifically to provide for learning behaviors for 'virtual teammates' directly from observed human behavior. Finally, we describe the integration of Delta3D with the ABL behavior engine, and report on research into establishing the theoretical framework that will be required to make use of tools like ABL to scale up to increasingly rich and realistic virtual characters.

  8. Willing and Enabled: The Academic Outcomes of a Tertiary Enabling Program in Regional Australia

    Science.gov (United States)

    Andrewartha, Lisa; Harvey, Andrew

    2014-01-01

    This paper examines the achievement levels of students undertaking the Tertiary Enabling Program (TEP) at La Trobe University. The TEP is an alternative pathway program that traverses multiple institutions, campuses, and disciplinary areas, and is designed to prepare a diverse student cohort for tertiary study. The Program integrates several…

  9. Frequency comb swept lasers.

    Science.gov (United States)

    Tsai, Tsung-Han; Zhou, Chao; Adler, Desmond C; Fujimoto, James G

    2009-11-09

    We demonstrate a frequency comb (FC) swept laser and a frequency comb Fourier domain mode locked (FC-FDML) laser for applications in optical coherence tomography (OCT). The fiber-based FC swept lasers operate at a sweep rate of 1kHz and 120kHz, respectively over a 135nm tuning range centered at 1310nm with average output powers of 50mW. A 25GHz free spectral range frequency comb filter in the swept lasers causes the lasers to generate a series of well defined frequency steps. The narrow bandwidth (0.015nm) of the frequency comb filter enables a approximately -1.2dB sensitivity roll off over approximately 3mm range, compared to conventional swept source and FDML lasers which have -10dB and -5dB roll offs, respectively. Measurements at very long ranges are possible with minimal sensitivity loss, however reflections from outside the principal measurement range of 0-3mm appear aliased back into the principal range. In addition, the frequency comb output from the lasers are equally spaced in frequency (linear in k-space). The filtered laser output can be used to self-clock the OCT interference signal sampling, enabling direct fast Fourier transformation of the fringe signals, without the need for fringe recalibration procedures. The design and operation principles of FC swept lasers are discussed and designs for short cavity lasers for OCT and interferometric measurement applications are proposed.

  10. FOILFEST :community enabled security.

    Energy Technology Data Exchange (ETDEWEB)

    Moore, Judy Hennessey; Johnson, Curtis Martin; Whitley, John B.; Drayer, Darryl Donald; Cummings, John C., Jr. (.,; .)

    2005-09-01

    The Advanced Concepts Group of Sandia National Laboratories hosted a workshop, ''FOILFest: Community Enabled Security'', on July 18-21, 2005, in Albuquerque, NM. This was a far-reaching look into the future of physical protection consisting of a series of structured brainstorming sessions focused on preventing and foiling attacks on public places and soft targets such as airports, shopping malls, hotels, and public events. These facilities are difficult to protect using traditional security devices since they could easily be pushed out of business through the addition of arduous and expensive security measures. The idea behind this Fest was to explore how the public, which is vital to the function of these institutions, can be leveraged as part of a physical protection system. The workshop considered procedures, space design, and approaches for building community through technology. The workshop explored ways to make the ''good guys'' in public places feel safe and be vigilant while making potential perpetrators of harm feel exposed and convinced that they will not succeed. Participants in the Fest included operators of public places, social scientists, technology experts, representatives of government agencies including DHS and the intelligence community, writers and media experts. Many innovative ideas were explored during the fest with most of the time spent on airports, including consideration of the local airport, the Albuquerque Sunport. Some provocative ideas included: (1) sniffers installed in passage areas like revolving door, escalators, (2) a ''jumbotron'' showing current camera shots in the public space, (3) transparent portal screeners allowing viewing of the screening, (4) a layered open/funnel/open/funnel design where open spaces are used to encourage a sense of ''communitas'' and take advantage of citizen ''sensing'' and funnels are technological

  11. Terahertz Characterization of DNA: Enabling a Novel Approach

    Science.gov (United States)

    2015-11-01

    nucleic acid sequences within a genetic library would pave the way for improved forensic analysis, genetic testing, and DNA production processes.1 Other...ARL-CR-0788 ● NOV 2015 US Army Research Laboratory Terahertz Characterization of DNA : Enabling a Novel Approach prepared by...Research Laboratory Terahertz Characterization of DNA : Enabling a Novel Approach prepared by Sarah Stranieri University of Illinois at Urbana

  12. Design, Fabrication, Installation and Commissioning of the Helium Refrigeration system Supporting Superconducting Radio Frequency Testing at Facility for Rare Isotope Beams at Michigan State University

    Science.gov (United States)

    Casagrande, F.; Fila, A.; Nguyen, C.; Tatsumoto, H.

    2017-12-01

    The Facility for Rare Isotope Beams (FRIB) will be a scientific user facility for the Office of Nuclear Physics in the U.S. Department of Energy Office of Science (DOE-SC). The FRIB linear accelerator (LINAC) will be comprised of cryomodules each with multiple Superconducting Radio Frequency (SRF) cavities operating at 2 K. A helium refrigeration system was designed, fabricated, installed and commissioned in the SRF high bay building to test and certify these cavities and cryomodules before installation in the FRIB LINAC tunnel. The helium refrigeration system includes a helium refrigerator which has nominal capacity of 900 W at 4 K, 5000 L liquid helium storage Dewar, helium gas storage, two room temperature vacuum pumps capable of 2.5 g/s each for 2 K testing, purifier, purifier recovery compressor, and the distribution system for liquid nitrogen and helium. The helium refrigeration system is now operational supporting three below grade cavity testing Dewars and one cryomodule testing bunker meeting the required throughput of 1 cavity per day.

  13. Frequency of the Original Kidney Disease and Its Effect on the Outcome of Kidney Transplant in the Urology-Nephrology Center Mansoura University.

    Science.gov (United States)

    Mashaly, Mohamed E; Ismail, Mabrouk I; Lotfy, Esam E; Donia, Ahmed F; Wafa, Ihab W; Foda, Mohamed A; Denewar, Ahmed A; Abbas, Mohamed H; Shokeir, Ahmed A

    2016-04-01

    Renal allograft function and graft survival depends on many factors, including the source of the graft, immunologic matching between donor and recipient, incidence of acute rejection, and recurrence of the original kidney disease. This work aimed to evaluate the effects of the original kidney disease on patient and graft survival. This was a retrospective, single-center study that included 2189 kidney transplant recipients who were transplanted at The Urology and Nephrology Centre, Mansoura University, between 1976 and 2010. Of 2189 recipients, 1350 patients with unknown original kidney disease were excluded, with the remaining 839 patients divided into 4 groups according to their original kidney disease. We found pretransplant dialysis and blood transfusion to be statistically significant among the 4 groups. Regarding induction immunosuppressive therapy, a statistical significance was found between the 4 groups regarding the presence and type of induction therapy, with no statistical significance regarding the type of maintenance immunosuppression. There was no statistical significance between the 4 groups regarding the incidence of acute and chronic rejection. We also found recurrence of original kidney disease to be statistically significant in the 4 groups, particularly in the group that included patients with glomerular disease, where the highest rate of recurrence was reported in patients with focal segmental glomerulosclerosis and membranoproliferative glomerulonephritis, and patient and graft survival was also statistically significant. The original kidney disease has an effect on renal allograft function and graft and patient survival.

  14. The Frequency of Errors of Blood Pressure Measurement among Nurses in the Hospitals Affiliated to Shiraz University of Medical Sciences, 2014

    Directory of Open Access Journals (Sweden)

    Roya Dokoohaki

    2015-03-01

    Full Text Available Background: The global prevalence of hypertension is one billion persons resulting in about 7.1 million deaths per year. In Iran, no statics of hypertension is available, but it has been reported that 40% of deaths are caused by cardiovascular diseases. Measuring blood pressure is one of the basic principles of medical examinations; however, the quality of the scientific standards of its technique is not highly observed. Objectives: The present study aimed to evaluate the frequency of errors of measuring blood pressure among B.Sc. nurses working at in government hospitals of Shiraz, Iran. Materials and Methods: This descriptive-analytical, cross-sectional study was conducted on 250 nurses selected from various wards. The study data were collected using the standard check list of blood pressure measurement, technique of American Heart Association (AHA guideline, and a questionnaire containing questions regarding knowledge about blood pressure measurement skills. Results: This study showed that 54.0% and 78.0% of the participants obtained moderate scores (50 - 74.99 in the theoretical and practical tests, respectively. The results of Pearson’s correlation coefficient demonstrated no significant relationship between the scores of theory and practice (P > 0.05. Most of the errors in measuring blood pressure in this research consisted of not measuring blood pressure at two stages, not observing its preparations and the proper time interval between the two stages, and not observing the measuring arrangements according to the checklist. Conclusions: Considering the participants’ theory and practice scores, it was concluded that evaluation of blood pressure measurement, which is an important basis in diagnosis and treatment, should be considered as an educational priority of health teams.

  15. The Frequency of Academic Burnout and Related Factors among Medical Students at Shahid Beheshti University of Medical Sciences, Tehran, in 2016

    Directory of Open Access Journals (Sweden)

    Hadi Azimi

    2016-03-01

    Full Text Available Abstract  Background: Academic burnout is the state of negative emotions and low motivation in one’s education. Understanding the status of academic burnout is the primary step to make proper decisions. The present study, therefore, was conducted to investigate comparative degrees of academic burnout among medical students in their first five semesters of medical education at Shahid Beheshti University of Medical Sciences, Tehran, Iran.  Methods: In the present cross-sectional study, a total of 525 medical students at the School of Medicine filled out the Persian version of Maslach Burnout Inventory – Student Survey from January 15 to February 5, 2016. Chi-square, Mantel-Haenszel, and Kruskal–Wallis tests were run in SPSS for data analysis. P-value<0.05 was considered significant.  Results: Based on the collected data, it was shown that 49.2% of the participants were male and 50.8% were female. Only 8 (1.5% participants were married. No statistically significant difference was observed between the variables investigated and academic burnout (P>0.05. It was also observed that only four (0.8% medical students (all new-comers were in low academic burnout group and 521 (99.2% were categorized in medium academic burnout group. Finally, it was found that academic burnout of the students increase as their educational level advance, making the first-semester students having the lowest and fifth-semester students the highest academic burnout indices (P<0.001.  Conclusion: It is concluded that, from among the variables studied, only students’ educational level made a difference in medical students’ academic burnout.Keywords: Academic efficacy; Burnout; Cynicism; Exhaustion; Medical Students 

  16. Geo-Enabled, Mobile Services

    DEFF Research Database (Denmark)

    Jensen, Christian Søndergaard

    2006-01-01

    We are witnessing the emergence of a global infrastructure that enables the widespread deployment of geo-enabled, mobile services in practice. At the same time, the research community has also paid increasing attention to data management aspects of mobile services. This paper offers me...

  17. Toward genome-enabled mycology.

    Science.gov (United States)

    Hibbett, David S; Stajich, Jason E; Spatafora, Joseph W

    2013-01-01

    Genome-enabled mycology is a rapidly expanding field that is characterized by the pervasive use of genome-scale data and associated computational tools in all aspects of fungal biology. Genome-enabled mycology is integrative and often requires teams of researchers with diverse skills in organismal mycology, bioinformatics and molecular biology. This issue of Mycologia presents the first complete fungal genomes in the history of the journal, reflecting the ongoing transformation of mycology into a genome-enabled science. Here, we consider the prospects for genome-enabled mycology and the technical and social challenges that will need to be overcome to grow the database of complete fungal genomes and enable all fungal biologists to make use of the new data.

  18. System for RFID-Enabled Information Collection

    Science.gov (United States)

    Fink, Patrick W. (Inventor); Lin, Gregory Y. (Inventor); Kennedy, Timothy F. (Inventor); Ngo, Phong H. (Inventor)

    2017-01-01

    A sensor and system provide for radio frequency identification (RFID)-enabled information collection. The sensor includes a ring-shaped element and an antenna. The ring-shaped element includes a conductive ring and an RFID integrated circuit. The antenna is spaced apart from the ring-shaped element and defines an electrically-conductive path commensurate in size and shape to at least a portion of the conductive ring. The system may include an interrogator for energizing the ring-shaped element and receiving a data transmission from the RFID integrated circuit that has been energized for further processing by a processor.

  19. Arbitrary optical frequency synthesis traced to an optical frequency comb

    Science.gov (United States)

    Cai, Zihang; Zhang, Weipeng; Yang, Honglei; Li, Yan; Wei, Haoyun

    2016-11-01

    An arbitrary optical frequency synthesizer with a broad tuning range and high frequency accuracy is presented. The system includes an external cavity diode laser (ECDL) as the output laser, an Erbium-doped optical frequency comb being a frequency reference, and a control module. The optical frequency from the synthesizer can be continuously tuned by the large-scale trans-tooth switch and the fine intra-tooth adjustment. Robust feedback control by regulating the current and PZT voltage enables the ECDL to phase-lock to the Erbium-doped optical frequency comb, therefore to keep stable frequency output. In the meanwhile, the absolute frequency of the synthesizer is determined by the repetition rate, the offset frequency and the beat frequency. All the phase lock loops in the system are traced back to a Rubidium clock. A powerful and friendly software is developed to make the operation convenient by integrating the functions of frequency setting, tuning, tracing, locking and measuring into a LabVIEW interface. The output frequency tuning span and the uncertainty of the system are evaluated as >6 THz and <3 kHz, respectively. The arbitrary optical frequency synthesizer will be a versatile tool in diverse applications, such as synthetic wavelength based absolute distance measurement and frequency-stabilized Cavity Ring-Down Spectroscopy.

  20. Frequency standards

    CERN Document Server

    Riehle, Fritz

    2006-01-01

    Of all measurement units, frequency is the one that may be determined with the highest degree of accuracy. It equally allows precise measurements of other physical and technical quantities, whenever they can be measured in terms of frequency.This volume covers the central methods and techniques relevant for frequency standards developed in physics, electronics, quantum electronics, and statistics. After a review of the basic principles, the book looks at the realisation of commonly used components. It then continues with the description and characterisation of important frequency standards

  1. Physics of the Brain. Prevention of the Epileptic Seizures by the Multi-photon Pulsed-operated Fiber Lasers in the Ultraviolet Range of Frequencies.

    Science.gov (United States)

    Stefan, V. Alexander; IAPS Team

    The novel study of the epileptogenesis mechanisms is proposed. It is based on the pulsed-operated (amplitude modulation) multi-photon (frequency modulation) fiber-laser interaction with the brain epilepsy-topion (the epilepsy onset area), so as to prevent the excessive electrical discharge (epileptic seizure) in the brain. The repetition frequency, Ω, matches the low frequency (epileptic) phonon waves in the brain. The laser repetition frequency (5-100 pulses per second) enables the resonance-scanning of the wide range of the phonon (possible epileptic-to-be) activity in the brain. The tunable fiber laser frequencies, Δω (multi photon operation), are in the ultraviolet frequency range, thus enabling monitoring of the electrical charge imbalance (within the 10s of milliseconds), and the DNA-corruption in the epilepsy-topion, as the possible cause of the disease. Supported by Nikola Tesla Labs., Stefan University.

  2. Taxonomy Enabled Discovery (TED) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The proposal addresses the NASA's need to enable scientific discovery and the topic's requirements for: processing large volumes of data, commonly available on the...

  3. Computer Security Systems Enable Access.

    Science.gov (United States)

    Riggen, Gary

    1989-01-01

    A good security system enables access and protects information from damage or tampering, but the most important aspects of a security system aren't technical. A security procedures manual addresses the human element of computer security. (MLW)

  4. Secure Enclaves-Enabled Technologies

    Science.gov (United States)

    2014-04-25

    William Vine , Benjamin Vowell Team Advisor: Capt Nick Mastronardi UNITED STATES AIR FORCE ACADEMY Introduction Secure Enclaves-Enabled...hardware solution to cyber security is unique in an industry dominated by software solutions which hackers inevitably find ways to circumnavigate

  5. Frequency synthesiser

    NARCIS (Netherlands)

    Drago, S.; Sebastiano, Fabio; Leenaerts, Dominicus Martinus Wilhelmus; Breems, Lucien Johannes; Nauta, Bram

    2010-01-01

    A low power frequency synthesiser circuit (30) for a radio transceiver, the synthesiser circuit comprising: a digital controlled oscillator configured to generate an output signal having a frequency controlled by an input digital control word (DCW); a feedback loop connected between an output and an

  6. Smart Grid enabled heat pumps

    DEFF Research Database (Denmark)

    Carmo, Carolina; Detlefsen, Nina; Nielsen, Mads Pagh

    2014-01-01

    The transition towards a 100 % fossil-free energy system, while achieving extreme penetration levels of intermittent wind and solar power in electricity generation, requires demand-side technologies that are smart (intermittency-friendly) and efficient. The integration of Smart Grid enabling...

  7. Editorial: Schools as enabling environments

    African Journals Online (AJOL)

    Hennie

    South African Journal of Education, Volume 34, Number 4, November 2014. 1. Editorial, 6 pages, http://www.sajournalofeducation.co.za. Editorial: Schools as enabling environments. Guest Editors: Mahlapahlapana Themane and David Osher. Children and youth need safe and supportive schools if they are to succeed in ...

  8. A Bluetooth-enabled HiperLAN/2 receiver

    NARCIS (Netherlands)

    Schiphorst, Roelof; Hoeksema, F.W.; Slump, Cornelis H.

    2003-01-01

    n our SDR project we aim to combine a GFSK receiver (Bluetooth) with an OFDM receiver (HiperLAN/2). Other WLAN standards use the same frequency bands and modulation techniques. So our Bluetooth-enabled HiperLAN/2 receiver can easily be adapted to other WLAN standards. This paper focuses on the

  9. A Bluetooth-enabled HiperLan/2 Receiver

    NARCIS (Netherlands)

    Schiphorst, Roelof; Hoeksema, F.W.; Slump, Cornelis H.

    2003-01-01

    In our SDR project we aim to combine a GFSK receiver (Bluetooth) with an OFDM receiver (HiperLAN/2). Other WLAN standards use the same frequency bands and modulation techniques. So our Bluetooth-enabled HiperLAN/2 receiver can easily be adapted to other WLAN standards. This paper focuses on the

  10. Organizational Enablers for Project Governance

    DEFF Research Database (Denmark)

    Müller, Ralf; Shao, Jingting; Pemsel, Sofia

    and their relationships to organizational success. Based on these results, the authors discovered that organizational enablers (including key factors such as leadership, governance, and influence of project managers) have a critical impact on how organizations operate, adapt to market fluctuations and forces, and make...... essential changes over time. This must-read book is a practical guide for executives and project managers alike. The insights and industry examples provided can be applied to any project-based organization......., Organizational Enablers for Project Governance, Ralf Müller, Jingting Shao, and Sofia Pemsel examine the interaction of governance and governmentality in various types of companies and demonstrate how these factors drive business success and influence project work, efficiency, and profitability. The data...

  11. New Generation Sensor Web Enablement

    Directory of Open Access Journals (Sweden)

    Christoph Stasch

    2011-03-01

    Full Text Available Many sensor networks have been deployed to monitor Earth’s environment, and more will follow in the future. Environmental sensors have improved continuously by becoming smaller, cheaper, and more intelligent. Due to the large number of sensor manufacturers and differing accompanying protocols, integrating diverse sensors into observation systems is not straightforward. A coherent infrastructure is needed to treat sensors in an interoperable, platform-independent and uniform way. The concept of the Sensor Web reflects such a kind of infrastructure for sharing, finding, and accessing sensors and their data across different applications. It hides the heterogeneous sensor hardware and communication protocols from the applications built on top of it. The Sensor Web Enablement initiative of the Open Geospatial Consortium standardizes web service interfaces and data encodings which can be used as building blocks for a Sensor Web. This article illustrates and analyzes the recent developments of the new generation of the Sensor Web Enablement specification framework. Further, we relate the Sensor Web to other emerging concepts such as the Web of Things and point out challenges and resulting future work topics for research on Sensor Web Enablement.

  12. 'Ethos' Enabling Organisational Knowledge Creation

    Science.gov (United States)

    Matsudaira, Yoshito

    This paper examines knowledge creation in relation to improvements on the production line in the manufacturing department of Nissan Motor Company and aims to clarify embodied knowledge observed in the actions of organisational members who enable knowledge creation will be clarified. For that purpose, this study adopts an approach that adds a first, second, and third-person's viewpoint to the theory of knowledge creation. Embodied knowledge, observed in the actions of organisational members who enable knowledge creation, is the continued practice of 'ethos' (in Greek) founded in Nissan Production Way as an ethical basis. Ethos is knowledge (intangible) assets for knowledge creating companies. Substantiated analysis classifies ethos into three categories: the individual, team and organisation. This indicates the precise actions of the organisational members in each category during the knowledge creation process. This research will be successful in its role of showing the indispensability of ethos - the new concept of knowledge assets, which enables knowledge creation -for future knowledge-based management in the knowledge society.

  13. Tracing Knowledge Transfer from Universities to Industry: A Text Mining Approach

    DEFF Research Database (Denmark)

    Woltmann, Sabrina; Alkærsig, Lars

    2017-01-01

    This paper identifies transferred knowledge between universities and the industry by proposing the use of a computational linguistic method. Current research on university-industry knowledge exchange relies often on formal databases and indicators such as patents, collaborative publications and l...... is the first step to enable the identification of common knowledge and knowledge transfer via text mining to increase its measurability....... and license agreements, to assess the contribution to the socioeconomic surrounding of universities. We, on the other hand, use the texts from university abstracts to identify university knowledge and compare them with texts from firm webpages. We use these text data to identify common key words and thereby...... identify overlapping contents among the texts. As method we use a well-established word ranking method from the field of information retrieval term frequency–inverse document frequency (TFIDF) to identify commonalities between texts from university. In examining the outcomes of the TFIDF statistic we find...

  14. Venture Capitalist Enabled Entrepreneurial Mentoring

    DEFF Research Database (Denmark)

    Agrawal, Anirudh

    2018-01-01

    -up entrepreneur. Using some interviews and secondary data from three Indian VC firms, this chapter explores the VC and investee enterprise mentoring within the Indian start-up ecosystem, The data analysis suggests that factors for the best outcomes include VCs that are highly networked‚ intensively sector focused......, have entrepreneurs as investors, and that engage frequently with investees over managerial and market issues. Using these cases, this study proposes an antecedent‚ action and outcome model of venture capital enabled entrepreneurial mentoring in India. This model can be expanded in the global context....

  15. Optimized microsystems-enabled photovoltaics

    Energy Technology Data Exchange (ETDEWEB)

    Cruz-Campa, Jose Luis; Nielson, Gregory N.; Young, Ralph W.; Resnick, Paul J.; Okandan, Murat; Gupta, Vipin P.

    2015-09-22

    Technologies pertaining to designing microsystems-enabled photovoltaic (MEPV) cells are described herein. A first restriction for a first parameter of an MEPV cell is received. Subsequently, a selection of a second parameter of the MEPV cell is received. Values for a plurality of parameters of the MEPV cell are computed such that the MEPV cell is optimized with respect to the second parameter, wherein the values for the plurality of parameters are computed based at least in part upon the restriction for the first parameter.

  16. Nanomaterial-enabled neural stimulation

    Directory of Open Access Journals (Sweden)

    Yongchen eWang

    2016-03-01

    Full Text Available Neural stimulation is a critical technique in treating neurological diseases and investigating brain functions. Traditional electrical stimulation uses electrodes to directly create intervening electric fields in the immediate vicinity of neural tissues. Second-generation stimulation techniques directly use light, magnetic fields or ultrasound in a non-contact manner. An emerging generation of non- or minimally invasive neural stimulation techniques is enabled by nanotechnology to achieve a high spatial resolution and cell-type specificity. In these techniques, a nanomaterial converts a remotely transmitted primary stimulus such as a light, magnetic or ultrasonic signal to a localized secondary stimulus such as an electric field or heat to stimulate neurons. The ease of surface modification and bio-conjugation of nanomaterials facilitates cell-type-specific targeting, designated placement and highly localized membrane activation. This review focuses on nanomaterial-enabled neural stimulation techniques primarily involving opto-electric, opto-thermal, magneto-electric, magneto-thermal and acousto-electric transduction mechanisms. Stimulation techniques based on other possible transduction schemes and general consideration for these emerging neurotechnologies are also discussed.

  17. Enabling Exploration Through Docking Standards

    Science.gov (United States)

    Hatfield, Caris A.

    2012-01-01

    Human exploration missions beyond low earth orbit will likely require international cooperation in order to leverage limited resources. International standards can help enable cooperative missions by providing well understood, predefined interfaces allowing compatibility between unique spacecraft and systems. The International Space Station (ISS) partnership has developed a publicly available International Docking System Standard (IDSS) that provides a solution to one of these key interfaces by defining a common docking interface. The docking interface provides a way for even dissimilar spacecraft to dock for exchange of crew and cargo, as well as enabling the assembly of large space systems. This paper provides an overview of the key attributes of the IDSS, an overview of the NASA Docking System (NDS), and the plans for updating the ISS with IDSS compatible interfaces. The NDS provides a state of the art, low impact docking system that will initially be made available to commercial crew and cargo providers. The ISS will be used to demonstrate the operational utility of the IDSS interface as a foundational technology for cooperative exploration.

  18. Automatic oscillator frequency control system

    Science.gov (United States)

    Smith, S. F. (Inventor)

    1985-01-01

    A frequency control system makes an initial correction of the frequency of its own timing circuit after comparison against a frequency of known accuracy and then sequentially checks and corrects the frequencies of several voltage controlled local oscillator circuits. The timing circuit initiates the machine cycles of a central processing unit which applies a frequency index to an input register in a modulo-sum frequency divider stage and enables a multiplexer to clock an accumulator register in the divider stage with a cyclical signal derived from the oscillator circuit being checked. Upon expiration of the interval, the processing unit compares the remainder held as the contents of the accumulator against a stored zero error constant and applies an appropriate correction word to a correction stage to shift the frequency of the oscillator being checked. A signal from the accumulator register may be used to drive a phase plane ROM and, with periodic shifts in the applied frequency index, to provide frequency shift keying of the resultant output signal. Interposition of a phase adder between the accumulator register and phase plane ROM permits phase shift keying of the output signal by periodic variation in the value of a phase index applied to one input of the phase adder.

  19. The Bursting Universe: New Tools for Cosmology and Physics

    Science.gov (United States)

    Osten, Rachel A.; ngVLA Science Advisory Council

    2018-01-01

    The Very Large Array's versatile operations enable it to respond quickly to track and study transient phenomena in the universe. This was one of the main science drivers for the recent upgrade to what is now the Jansky VLA, and results have demonstrated the fundamental role of radio observations in the follow-up of transients. Radio frequency measurements of rapidly variable phenomena enable important constraints on the energy budget of astrophysical explosions and study of how these explosions interact with the local environment, to name a few. Radio studies of the bursting universe also provide new tools for making important advances in cosmology and fundamental physics. The study of pulsars and their precision timing enables superior constraints on fundamental physics as well as astrophysical questions of stellar dynamics, star formation histories, and stellar evolution. Pulsars in the Galactic center move in the space-time potential of a supermassive black hole and afford many opportunities for fundamental tests of gravity. The myriad of open questions regarding the formation and growth of black holes over many orders of magnitude in mass require sensitive radio measurements with high resolution imaging to begin to address. I will describe how the ngVLA project, a combination of increase in sensitivity and capability to observe at microwave frequencies and above, is necessary to make these advances, such as potential radio transients associated with the merger of supermassive black holes, stellar radio flares complementing future multiwavelength observations, the use of pulsars for physics and astrophysics, and others.

  20. An Exploration of Factors Associated with Student Attrition and Success in Enabling Programs

    Science.gov (United States)

    Morison, Anthony; Cowley, Kym

    2017-01-01

    University-based enabling programs (EPs) provide a tertiary pathway for up to twenty percent of undergraduate enrolments at Australian universities. Attrition from these programs and the resulting costs to students, universities and society at large is an important issue deserving research attention. This research project aimed to investigate the…

  1. Context-Enabled Business Intelligence

    Energy Technology Data Exchange (ETDEWEB)

    Troy Hiltbrand

    2012-04-01

    To truly understand context and apply it in business intelligence, it is vital to understand what context is and how it can be applied in addressing organizational needs. Context describes the facets of the environment that impact the way that end users interact with the system. Context includes aspects of location, chronology, access method, demographics, social influence/ relationships, end-user attitude/ emotional state, behavior/ past behavior, and presence. To be successful in making Business Intelligence content enabled, it is important to be able to capture the context of use user. With advances in technology, there are a number of ways in which this user based information can be gathered and exposed to enhance the overall end user experience.

  2. Simulation Enabled Safeguards Assessment Methodology

    Energy Technology Data Exchange (ETDEWEB)

    Robert Bean; Trond Bjornard; Thomas Larson

    2007-09-01

    It is expected that nuclear energy will be a significant component of future supplies. New facilities, operating under a strengthened international nonproliferation regime will be needed. There is good reason to believe virtual engineering applied to the facility design, as well as to the safeguards system design will reduce total project cost and improve efficiency in the design cycle. Simulation Enabled Safeguards Assessment MEthodology (SESAME) has been developed as a software package to provide this capability for nuclear reprocessing facilities. The software architecture is specifically designed for distributed computing, collaborative design efforts, and modular construction to allow step improvements in functionality. Drag and drop wireframe construction allows the user to select the desired components from a component warehouse, render the system for 3D visualization, and, linked to a set of physics libraries and/or computational codes, conduct process evaluations of the system they have designed.

  3. Enablers and constrainers to participation

    DEFF Research Database (Denmark)

    Desjardins, Richard; Milana, Marcella

    2007-01-01

    as to construct a tool for analyzing the targeting of adult learning policy, with regard to both its coverage and expected consequences. Our aim is to develop a means for a more in-depth analysis of the match-mismatch of public policy and persisting constraints to participation.......This paper briefly reviews some of evidence on participation patterns in Nordic countries and some of the defining parameters that may explain the observations. This is done in a comparative perspective by contrasting results from the 2003 Eurobarometer data between Nordic countries and a handful...... of non-Nordic countries. An emphasis is placed on the constraining and enabling elements to participation and how these may explain why certain groups participate more or less than others. A central question of interest to this paper is to what extent does (can) government intervention interact...

  4. Informatics enables public health surveillance

    Directory of Open Access Journals (Sweden)

    Scott J. N McNabb

    2017-01-01

    Full Text Available Over the past decade, the world has radically changed. New advances in information and communication technologies (ICT connect the world in ways never imagined. Public health informatics (PHI leveraged for public health surveillance (PHS, can enable, enhance, and empower essential PHS functions (i.e., detection, reporting, confirmation, analyses, feedback, response. However, the tail doesn't wag the dog; as such, ICT cannot (should not drive public health surveillance strengthening. Rather, ICT can serve PHS to more effectively empower core functions. In this review, we explore promising ICT trends for prevention, detection, and response, laboratory reporting, push notification, analytics, predictive surveillance, and using new data sources, while recognizing that it is the people, politics, and policies that most challenge progress for implementation of solutions.

  5. Genome-enabled plant metabolomics.

    Science.gov (United States)

    Tohge, Takayuki; de Souza, Leonardo Perez; Fernie, Alisdair R

    2014-09-01

    The grand challenge currently facing metabolomics is that of comprehensitivity whilst next generation sequencing and advanced proteomics methods now allow almost complete and at least 50% coverage of their respective target molecules, metabolomics platforms at best offer coverage of just 10% of the small molecule complement of the cell. Here we discuss the use of genome sequence information as an enabling tool for peak identity and for translational metabolomics. Whilst we argue that genome information is not sufficient to compute the size of a species metabolome it is highly useful in predicting the occurrence of a wide range of common metabolites. Furthermore, we describe how via gene functional analysis in model species the identity of unknown metabolite peaks can be resolved. Taken together these examples suggest that genome sequence information is current (and likely will remain), a highly effective tool in peak elucidation in mass spectral metabolomics strategies. Copyright © 2014 Elsevier B.V. All rights reserved.

  6. Important innovation enablers for innovation teams

    OpenAIRE

    Johnsson, Mikael

    2016-01-01

    This research aims to study if innovation enablers (Enablers), i.e. factors that enable innovation work, are important for innovation teams in on-going innovation work and if lack of Enablers affects innovation projects negatively. The background to this study is that prior research states that numerous factors are important for innovation work, but there’s still knowledge to gain whatever these Enablers are perceived to be important by innovation teams. Data from three innovation teams on-go...

  7. Laser-Bioplasma Interaction: Excitation and Suppression of the Brain Waves by the Multi-photon Pulsed-operated Fiber Lasers in the Ultraviolet Range of Frequencies

    Science.gov (United States)

    Stefan, V. Alexander; IAPS-team Team

    2017-10-01

    The novel study of the laser excitation-suppression of the brain waves is proposed. It is based on the pulsed-operated multi-photon fiber-laser interaction with the brain parvalbumin (PV) neurons. The repetition frequency matches the low frequency brain waves (5-100 Hz); enabling the resonance-scanning of the wide range of the PV neurons (the generators of the brain wave activity). The tunable fiber laser frequencies are in the ultraviolet frequency range, thus enabling the monitoring of the PV neuron-DNA, within the 10s of milliseconds. In medicine, the method can be used as an ``instantaneous-on-off anesthetic.'' Supported by Nikola Tesla Labs, Stefan University.

  8. Compact RFID Enabled Moisture Sensor

    Directory of Open Access Journals (Sweden)

    U. H. Khan

    2016-09-01

    Full Text Available This research proposes a novel, low-cost RFID tag sensor antenna implemented using commercially available Kodak photo-paper. The aim of this paper is to investigate the possibility of stable, RFID centric communication under varying moisture levels. Variation in the frequency response of the RFID tag in presence of moisture is used to detect different moisture levels. Combination of unique jaw shaped contours and T-matching network is used for impedance matching which results in compact size and minimal ink consumption. Proposed tag is 1.4 × 9.4 cm2 in size and shows optimum results for various moisture levels upto 45% in FCC band with a bore sight read range of 12.1 m.

  9. Enabling technology for human collaboration.

    Energy Technology Data Exchange (ETDEWEB)

    Murphy, Tim Andrew (MindTel, LLC, Syracuse, NY); Jones, Wendell Bruce; Warner, David Jay (MindTel, LLC, Syracuse, NY); Doser, Adele Beatrice; Johnson, Curtis Martin; Merkle, Peter Benedict

    2003-11-01

    This report summarizes the results of a five-month LDRD late start project which explored the potential of enabling technology to improve the performance of small groups. The purpose was to investigate and develop new methods to assist groups working in high consequence, high stress, ambiguous and time critical situations, especially those for which it is impractical to adequately train or prepare. A testbed was constructed for exploratory analysis of a small group engaged in tasks with high cognitive and communication performance requirements. The system consisted of five computer stations, four with special devices equipped to collect physiologic, somatic, audio and video data. Test subjects were recruited and engaged in a cooperative video game. Each team member was provided with a sensor array for physiologic and somatic data collection while playing the video game. We explored the potential for real-time signal analysis to provide information that enables emergent and desirable group behavior and improved task performance. The data collected in this study included audio, video, game scores, physiological, somatic, keystroke, and mouse movement data. The use of self-organizing maps (SOMs) was explored to search for emergent trends in the physiological data as it correlated with the video, audio and game scores. This exploration resulted in the development of two approaches for analysis, to be used concurrently, an individual SOM and a group SOM. The individual SOM was trained using the unique data of each person, and was used to monitor the effectiveness and stress level of each member of the group. The group SOM was trained using the data of the entire group, and was used to monitor the group effectiveness and dynamics. Results suggested that both types of SOMs were required to adequately track evolutions and shifts in group effectiveness. Four subjects were used in the data collection and development of these tools. This report documents a proof of concept

  10. Enabling Participation In Exoplanet Science

    Science.gov (United States)

    Taylor, Stuart F.

    2015-08-01

    Determining the distribution of exoplanets has required the contributions of a community of astronomers, who all require the support of colleagues to finish their projects in a manner to enable them to enter new collaborations to continue to contribute to understanding exoplanet science.The contributions of each member of the astronomy community are to be encouraged and must never be intentionally obstructed.We present a member’s long pursuit to be a contributing part of the exoplanet community through doing transit photometry as a means of commissioning the telescopes for a new observatory, followed by pursuit of interpreting the distributions in exoplanet parameter data.We present how the photometry projects have been presented as successful by the others who have claimed to have completed them, but how by requiring its employees to present results while omitting one member has been obstructive against members working together and has prevented the results from being published in what can genuinely be called a peer-reviewed fashion.We present how by tolerating one group to obstruct one member from finishing participation and then falsely denying credit is counterproductive to doing science.We show how expecting one member to attempt to go around an ostracizing group by starting something different is destructive to the entire profession. We repeat previously published appeals to help ostracized members to “go around the observatory” by calling for discussion on how the community must act to reverse cases of shunning, bullying, and other abuses. Without better recourse and support from the community, actions that do not meet standard good collegial behavior end up forcing good members from the community. The most important actions are to enable an ostracized member to have recourse to participating in group papers by either working through other authors or through the journal. All journals and authors must expect that no co-author is keeping out a major

  11. CUDA Enabled Graph Subset Examiner

    Energy Technology Data Exchange (ETDEWEB)

    2016-12-22

    Finding Godsil-McKay switching sets in graphs is one way to demonstrate that a specific graph is not determined by its spectrum--the eigenvalues of its adjacency matrix. An important area of active research in pure mathematics is determining which graphs are determined by their spectra, i.e. when the spectrum of the adjacency matrix uniquely determines the underlying graph. We are interested in exploring the spectra of graphs in the Johnson scheme and specifically seek to determine which of these graphs are determined by their spectra. Given a graph G, a Godsil-McKay switching set is an induced subgraph H on 2k vertices with the following properties: I) H is regular, ii) every vertex in G/H is adjacent to either 0, k, or 2k vertices of H, and iii) at least one vertex in G/H is adjacent to k vertices in H. The software package examines each subset of a user specified size to determine whether or not it satisfies those 3 conditions. The software makes use of the massive parallel processing power of CUDA enabled GPUs. It also exploits the vertex transitivity of graphs in the Johnson scheme by reasoning that if G has a Godsil-McKay switching set, then it has a switching set which includes vertex 1. While the code (in its current state) is tuned to this specific problem, the method of examining each induced subgraph of G can be easily re-written to check for any user specified conditions on the subgraphs and can therefore be used much more broadly.

  12. Enabling individualized therapy through nanotechnology.

    Science.gov (United States)

    Sakamoto, Jason H; van de Ven, Anne L; Godin, Biana; Blanco, Elvin; Serda, Rita E; Grattoni, Alessandro; Ziemys, Arturas; Bouamrani, Ali; Hu, Tony; Ranganathan, Shivakumar I; De Rosa, Enrica; Martinez, Jonathan O; Smid, Christine A; Buchanan, Rachel M; Lee, Sei-Young; Srinivasan, Srimeenakshi; Landry, Matthew; Meyn, Anne; Tasciotti, Ennio; Liu, Xuewu; Decuzzi, Paolo; Ferrari, Mauro

    2010-08-01

    Individualized medicine is the healthcare strategy that rebukes the idiomatic dogma of 'losing sight of the forest for the trees'. We are entering a new era of healthcare where it is no longer acceptable to develop and market a drug that is effective for only 80% of the patient population. The emergence of "-omic" technologies (e.g. genomics, transcriptomics, proteomics, metabolomics) and advances in systems biology are magnifying the deficiencies of standardized therapy, which often provide little treatment latitude for accommodating patient physiologic idiosyncrasies. A personalized approach to medicine is not a novel concept. Ever since the scientific community began unraveling the mysteries of the genome, the promise of discarding generic treatment regimens in favor of patient-specific therapies became more feasible and realistic. One of the major scientific impediments of this movement towards personalized medicine has been the need for technological enablement. Nanotechnology is projected to play a critical role in patient-specific therapy; however, this transition will depend heavily upon the evolutionary development of a systems biology approach to clinical medicine based upon "-omic" technology analysis and integration. This manuscript provides a forward looking assessment of the promise of nanomedicine as it pertains to individualized medicine and establishes a technology "snapshot" of the current state of nano-based products over a vast array of clinical indications and range of patient specificity. Other issues such as market driven hurdles and regulatory compliance reform are anticipated to "self-correct" in accordance to scientific advancement and healthcare demand. These peripheral, non-scientific concerns are not addressed at length in this manuscript; however they do exist, and their impact to the paradigm shifting healthcare transformation towards individualized medicine will be critical for its success. Copyright 2010 Elsevier Ltd. All rights

  13. Enabling individualized therapy through nanotechnology

    Science.gov (United States)

    Sakamoto, Jason H.; van de Ven, Anne L.; Godin, Biana; Blanco, Elvin; Serda, Rita E.; Grattoni, Alessandro; Ziemys, Arturas; Bouamrani, Ali; Hu, Tony; Ranganathan, Shivakumar I.; De Rosa, Enrica; Martinez, Jonathan O.; Smid, Christine A.; Buchanan, Rachel M.; Lee, Sei-Young; Srinivasan, Srimeenakshi; Landry, Matthew; Meyn, Anne; Tasciotti, Ennio; Liu, Xuewu; Decuzzi, Paolo; Ferrari, Mauro

    2010-01-01

    Individualized medicine is the healthcare strategy that rebukes the idiomatic dogma of ‘losing sight of the forest for the trees’. We are entering a new era of healthcare where it is no longer acceptable to develop and market a drug that is effective for only 80% of the patient population. The emergence of “-omic” technologies (e.g. genomics, transcriptomics, proteomics, metabolomics) and advances in systems biology are magnifying the deficiencies of standardized therapy, which often provide little treatment latitude for accommodating patient physiologic idiosyncrasies. A personalized approach to medicine is not a novel concept. Ever since the scientific community began unraveling the mysteries of the genome, the promise of discarding generic treatment regimens in favor of patient-specific therapies became more feasible and realistic. One of the major scientific impediments of this movement towards personalized medicine has been the need for technological enablement. Nanotechnology is projected to play a critical role in patient-specific therapy; however, this transition will depend heavily upon the evolutionary development of a systems biology approach to clinical medicine based upon “-omic” technology analysis and integration. This manuscript provides a forward looking assessment of the promise of nanomedicine as it pertains to individualized medicine and establishes a technology “snapshot” of the current state of nano-based products over a vast array of clinical indications and range of patient specificity. Other issues such as market driven hurdles and regulatory compliance reform are anticipated to “self-correct” in accordance to scientific advancement and healthcare demand. These peripheral, non-scientific concerns are not addressed at length in this manuscript; however they do exist, and their impact to the paradigm shifting healthcare transformation towards individualized medicine will be critical for its success. PMID:20045055

  14. Barriers and enablers to academic health leadership.

    Science.gov (United States)

    Bharwani, Aleem; Kline, Theresa; Patterson, Margaret; Craighead, Peter

    2017-02-06

    Purpose This study sought to identify the barriers and enablers to leadership enactment in academic health-care settings. Design/methodology/approach Semi-structured interviews ( n = 77) with programme stakeholders (medical school trainees, university leaders, clinical leaders, medical scientists and directors external to the medical school) were conducted, and the responses content-analysed. Findings Both contextual and individual factors were identified as playing a role in affecting academic health leadership enactment that has an impact on programme development, success and maintenance. Contextual factors included sufficient resources allocated to the programme, opportunities for learners to practise leadership skills, a competent team around the leader once that person is in place, clear expectations for the leader and a culture that fosters open communication. Contextual barriers included highly bureaucratic structures, fear-of-failure and non-trusting cultures and inappropriate performance systems. Programmes were advised to select participants based on self-awareness, strong communication skills and an innovative thinking style. Filling specific knowledge and skill gaps, particularly for those not trained in medical school, was viewed as essential. Ineffective decision-making styles and tendencies to get involved in day-to-day activities were barriers to the development of academic health leaders. Originality/value Programmes designed to develop academic health-care leaders will be most effective if they develop leadership at all levels; ensure that the organisation's culture, structure and processes reinforce positive leadership practices; and recognise the critical role of teams in supporting its leaders.

  15. Enabling electroweak baryogenesis through dark matter

    Energy Technology Data Exchange (ETDEWEB)

    Lewicki, Marek [Institute of Theoretical Physics, Faculty of Physics, University of Warsaw,ul. Pasteura 5, 02-093 Warsaw (Poland); Department of Physics and Michigan Center for Theoretical Physics, University of Michigan,450 Church St., Ann Arbor, MI 48109 (United States); Rindler-Daller, Tanja [Department of Physics and Michigan Center for Theoretical Physics, University of Michigan,450 Church St., Ann Arbor, MI 48109 (United States); Institut für Astrophysik, Universitätssternwarte Wien, University of Vienna,Türkenschanzstr. 17, 1180 Vienna (Austria); Wells, James D. [Department of Physics and Michigan Center for Theoretical Physics, University of Michigan,450 Church St., Ann Arbor, MI 48109 (United States)

    2016-06-09

    We study the impact on electroweak baryogenesis from a swifter cosmological expansion induced by dark matter. We detail the experimental bounds that one can place on models that realize it, and we investigate the modifications of these bounds that result from a non-standard cosmological history. The modifications can be sizeable if the expansion rate of the Universe increases by several orders of magnitude. We illustrate the impact through the example of scalar field dark matter, which can alter the cosmological history enough to enable a strong-enough first-order phase transition in the Standard Model when it is supplemented by a dimension six operator directly modifying the Higgs boson potential. We show that due to the modified cosmological history, electroweak baryogenesis can be realized, while keeping deviations of the triple Higgs coupling below HL-LHC sensitivies. The required scale of new physics to effectuate a strong-enough first order phase transition can change by as much as twenty percent as the expansion rate increases by six orders of magnitude.

  16. Internet-enabled continuous geodetic reference station

    Science.gov (United States)

    Snow, R.; Dokka, R.

    2003-04-01

    Until recently, real-time geodesy through the Internet using geodetic GPS receivers has required either a co-located PC or a device server to convert serial data to IP. The Internet-enabled Continuous Geodetic Reference System (iCGRS) from Thales Navigation eliminates this requirement, thus saving up to 35 Watts per site. The user assigns a static IP address to the receiver and can thereafter communicate with the iCGRS through a web browser. The iCGRS supports streaming of GPS data in either BINEX or proprietary formats to up to five IP sockets, which can be either servers or clients. It can also stream RTCM corrections to these same sockets. The iCGRS can also automatically push session files to an FTP site simultaneously with the streaming of data. Sessions can be as short as 15 minutes or as long as 24 hours. Because the iCGRS significantly simplifies the communication equipment requirements for real-time geodesy, Louisiana State University has selected it for the backbone of the Louisiana Spatial Reference Center network. Fourteen iCGRS units will be installed statewide for multiple purposes, including Continuous Operating Reference Stations (CORS), subsidence monitoring and the streaming of RTCM corrections through the Internet.

  17. Dynamics of microresonator frequency comb generation: models and stability

    Directory of Open Access Journals (Sweden)

    Hansson Tobias

    2016-06-01

    Full Text Available Microresonator frequency combs hold promise for enabling a new class of light sources that are simultaneously both broadband and coherent, and that could allow for a profusion of potential applications. In this article, we review various theoretical models for describing the temporal dynamics and formation of optical frequency combs. These models form the basis for performing numerical simulations that can be used in order to better understand the comb generation process, for example helping to identify the universal combcharacteristics and their different associated physical phenomena. Moreover, models allow for the study, design and optimization of comb properties prior to the fabrication of actual devices. We consider and derive theoretical formalisms based on the Ikeda map, the modal expansion approach, and the Lugiato-Lefever equation. We further discuss the generation of frequency combs in silicon resonators featuring multiphoton absorption and free-carrier effects. Additionally, we review comb stability properties and consider the role of modulational instability as well as of parametric instabilities due to the boundary conditions of the cavity. These instability mechanisms are the basis for comprehending the process of frequency comb formation, for identifying the different dynamical regimes and the associated dependence on the comb parameters. Finally, we also discuss the phenomena of continuous wave bi- and multistability and its relation to the observation of mode-locked cavity solitons.

  18. Encouraging engagement in enabling programs: The students’ perspective

    Directory of Open Access Journals (Sweden)

    Suzi Hellmundt

    2017-03-01

    Full Text Available Student retention is a key concern in tertiary education enabling programs with research showing that early engagement leads to higher completion rates (Hodges et al., 2013. But how do students new to university education learn how to engage effectively? This article outlines an engagement framework that foregrounds Guidance, Encouragement, Modelling and Structure (GEMS as a holistic approach to facilitating effective student engagement. This framework was developed from qualitative data gleaned from students enrolled in the Preparing for Success Program at Southern Cross University, New South Wales, Australia. The findings from the students indicate that the GEMS framework activates student potential and enables them to use existing knowledge and experience to not only deepen and broaden their learning but also successfully prepare for further study.

  19. Universal trellises

    NARCIS (Netherlands)

    P.J. Collins (Pieter)

    2006-01-01

    textabstractA flow in three-dimensions is universal if the periodic orbits contains all knots and links. Universal flows were shown to exist by Ghrist, and can be constructed by means of templates. Likewise, a planar diffeomorphism is universal if it has a suspension flow which is a universal flow.

  20. Metamaterial-enabled transformation optics

    Science.gov (United States)

    Landy, Nathan

    Transformation Optics is a design methodology that uses the form invariance of Maxwell's equations to distort electromagnetic fields. This distortion is imposed on a region of space by mimicking a curvilinear coordinate system with prescribed magnetoelectric material parameters. By simply specifying the correct coordinate transformation, researchers have created such exotic devices as invisibility cloaks, ``perfect'' lenses, and illusion devices. Unfortunately, these devices typically require correspondingly exotic material parameters that do not occur in Nature. Researchers have therefore turned to complex artificial media known as metamaterials to approximate the desired responses. However, the metamaterial design process is complex, and there are limitations on the responses that they achieve. In this dissertation, we explore both the applicability and limitations of metamaterials in Transformation Optics design. We begin in Chapter 2 by investigating the freedoms available to use in the transformation optics design process itself. We show that quasi-conformal mappings may be used to alleviate some of the complexity of material design in both two- and three-dimensional design. We then go on in Chapter 3 to apply this method to the design of a transformation-optics modified optic. We show that even a highly-approximate implementation of such a lens would retain many of the key performance feautures that we would expect from a full material prescription. However, the approximations made in the design of our lens may not be valid in other areas of transformation optical design. For instance, the high-frequency approximations of our lens design ignore the effects of impedance mismatch, and the approximation is not valid when the material parameters vary on the order of a wavelength. Therefore, in Chapter 4 we use other freedoms available to us to design a full-parameter cloak of invisibility. By tailoring the electromagnetic environment of our cloak, we are able to

  1. Phonology without universal grammar.

    Science.gov (United States)

    Archangeli, Diana; Pulleyblank, Douglas

    2015-01-01

    The question of identifying the properties of language that are specific human linguistic abilities, i.e., Universal Grammar, lies at the center of linguistic research. This paper argues for a largely Emergent Grammar in phonology, taking as the starting point that memory, categorization, attention to frequency, and the creation of symbolic systems are all nonlinguistic characteristics of the human mind. The articulation patterns of American English rhotics illustrate categorization and systems; the distribution of vowels in Bantu vowel harmony uses frequencies of particular sequences to argue against Universal Grammar and in favor of Emergent Grammar; prefix allomorphy in Esimbi illustrates the Emergent symbolic system integrating phonological and morphological generalizations. The Esimbi case has been treated as an example of phonological opacity in a Universal Grammar account; the Emergent analysis resolves the pattern without opacity concerns.

  2. Phonology without Universal Grammar

    Directory of Open Access Journals (Sweden)

    Diana eArchangeli

    2015-09-01

    Full Text Available The question of identifying the properties of language that are specific human linguistic abilities, i.e. Universal Grammar, lies at the center of linguistic research. This paper argues for a largely Emergent Grammar in phonology, taking as the starting point that memory, categorization, attention to frequency, and the creation of symbolic systems are all nonlinguistic characteristics of the human mind. The articulation patterns of American English rhotics illustrate categorization and systems; the distribution of vowels in Bantu vowel harmony uses frequencies of particular sequences to argue against Universal Grammar and in favor of Emergent Grammar; prefix allomorphy in Esimbi illustrates the Emergent symbolic system integrating phonological and morphological generalizations. The Esimbi case has been treated as an example of phonological opacity in a Universal Grammar account; the Emergent analysis resolves the pattern without opacity concerns.

  3. Freqüência do emprego de analgésicos em unidades de terapia intensiva neonatal universitárias The frequency of pharmacological pain relief in university neonatal intensive care units

    Directory of Open Access Journals (Sweden)

    Ana Claudia Y. Prestes

    2005-10-01

    Full Text Available OBJETIVO: Verificar a freqüência com que são empregados analgésicos para o alívio da dor desencadeada por procedimentos invasivos em recém-nascidos internados em UTI universitárias e verificar o perfil de uso de medicamentos para o alívio da dor. MÉTODOS: Coorte prospectiva, avaliada entre 1° e 31 de outubro de 2001, de todos os recém-nascidos internados em quatro UTI. Dados coletados: características gerais das unidades; dados demográficos dos recém-nascidos; morbidade clínica e freqüência do emprego de analgésicos. Realizaram-se a análise estatística descritiva e a regressão linear múltipla por meio do SPSS 8.0, para analisar os fatores associados ao uso de analgésicos nesta coorte. RESULTADOS: No período, foram internados 91 recém-nascidos (1.025 pacientes-dia. Apenas 25% dos 1.025 pacientes-dia receberam alguma dose de analgésico por via sistêmica. Não foi administrada nenhuma medicação específica para o alívio da dor aguda durante os seguintes eventos dolorosos: intubações traqueais, punções arteriais, venosas, capilares e lombares. Na inserção de dreno de tórax, 100% dos recém-nascidos receberam analgesia específica e, para a passagem de cateteres centrais, apenas 8%. De 17 recém-nascidos submetidos a procedimentos cirúrgicos, somente nove receberam analgésicos no pós-operatório. O medicamento mais utilizado foi o fentanil (93%. A presença de ventilação mecânica elevou em 6,9 vezes, e a de dreno de tórax em cinco vezes a chance do recém-nascido receber alguma dose de analgésico. CONCLUSÃO: Há necessidade de melhorar a formação dos profissionais de saúde para diminuir a distância entre os conhecimentos científicos existentes a respeito da dor no recém-nascido e a prática clínica.OBJECTIVE: To evaluate the use of drugs to relieve the pain of invasive procedures newborn infants cared for at a university hospital NICU. METHODS: A prospective cohort study of all newborn infants

  4. Universal Trellises

    NARCIS (Netherlands)

    P.J. Collins (Pieter)

    2007-01-01

    htmlabstract A flow in three-dimensions is universal if the periodic orbits contains all knots and links. Universal flows were shown to exist by Ghrist, and can be constructed by means of templates. Likewise, a planar diffeomorphism is universal if it has a suspension

  5. Clock frequency estimation under spontaneous emission

    Science.gov (United States)

    Qin, Xi-Zhou; Huang, Jia-Hao; Zhong, Hong-Hua; Lee, Chaohong

    2018-02-01

    We investigate the quantum dynamics of a driven two-level system under spontaneous emission and its application in clock frequency estimation. By using the Lindblad equation to describe the system, we analytically obtain its exact solutions, which show three different regimes: Rabi oscillation, damped oscillation, and overdamped decay. From the analytical solutions, we explore how the spontaneous emission affects the clock frequency estimation. We find that under a moderate spontaneous emission rate, the transition frequency can still be inferred from the Rabi oscillation. Our results enable potential practical applications in frequency measurement and quantum control under decoherence.

  6. Interference Cancellation for Coexisting Wireless Data and Power Transmission in the Same Frequency

    Science.gov (United States)

    Yamazaki, Keita; Sugiyama, Yusuke; Kawahara, Yoshihiro; Saruwatari, Shunsuke; Watanabe, Takashi

    2014-11-01

    Combining wireless transmission of data and power signals enables wireless sensor networks to drive perpetually without changing batteries. To achieve the simultaneous data and power transmission, the present paper proposes power signal interference cancellation for wireless data and power transmission at the same time in the same frequency. We evaluate the performance of the proposed power signal interference cancellation using Universal Software Radio Peripheral N200 (USRP N200) software defined radio. Evaluations show that the proposed interference cancellation is feasible to receive data while transmitting power.

  7. Frequency of Anabolic Steroids Abuse in Bodybuilder Athletes in Kerman City†This article has been published in the Journal of Rafsanjan University of Medical Sciences in Persian language.

    Science.gov (United States)

    Sepehri, Gholamreza; Mousavi Fard, Majid; Sepehri, Ehsan

    2009-01-01

    Background: Athletes, especially bodybuilders, abuse anabolic steroid drugs to improve their strength and enhance their muscle growth and appearance. This study was conducted to determine the type and frequency of anabolic steroids abuse in bodybuilder athletes in Kerman City. Methods: A confidential questionnaire which included demographic data (age, education), name of abused anabolic drug and duration of drug abuse was completed by 202 bodybuilder athletes, and the collected data were analyzed using Chi Square test. A value of p bodybuilding activity was significantly higher in those used the anabolic drugs (38.8 months), comparing to those did not use any drugs (14.3 months). Oxymetholone was the most common drug used by athletes (42% merely used Oxymetholone). The frequency of anabolic steroids abuse was not related to education and age of the bodybuilder athletes. Conclusion: Bodybuilder athletes in Kerman city abuse anabolic steroids, and the health care system should plan to inform them about anabolic steroid adverse effects. PMID:24494079

  8. Frequency of Anabolic Steroids Abuse in Bodybuilder Athletes in Kerman City † This article has been published in the Journal of Rafsanjan University of Medical Sciences in Persian language.

    OpenAIRE

    Sepehri, Gholamreza; Mousavi Fard, Majid; Sepehri, Ehsan

    2009-01-01

    Background: Athletes, especially bodybuilders, abuse anabolic steroid drugs to improve their strength and enhance their muscle growth and appearance. This study was conducted to determine the type and frequency of anabolic steroids abuse in bodybuilder athletes in Kerman City. Methods: A confidential questionnaire which included demographic data (age, education), name of abused anabolic drug and duration of drug abuse was completed by 202 bodybuilder athletes, and the collected data were anal...

  9. The Digital Thread as the Key Enabler

    Science.gov (United States)

    2016-11-01

    life cycle by providing the capability to access, integrate and transform disparate data into actionable information. The digital thread is the...17 Defense AT&L: November-December 2016 The Digital Thread as the Key Enabler Col. Keith Bearden, USAF Bearden is the deputy director of...enabling you to do your job better, faster and cheaper. There is one initiative, the key enabler, to accomplish this goal—the digital thread. But let’s

  10. Supporting Pre-Service Teachers' Technology-Enabled Learning Design Thinking through Whole of Programme Transformation

    Science.gov (United States)

    Bower, Matt; Highfield, Kate; Furney, Pam; Mowbray, Lee

    2013-01-01

    This paper explains a development and evaluation project aimed at transforming two pre-service teacher education programmes at Macquarie University to more effectively cultivate students' technology-enabled learning design thinking. The process of transformation was based upon an explicit and sustained focus on developing university academics'…

  11. Semantic Sensor Web Enablement for COAST Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Sensor Web Enablement (SWE) is an Open Geospatial Consortium (OGC) standard Service Oriented Architecture (SOA) that facilitates discovery and integration of...

  12. THE ROLE OF THE UNIVERSITY IN FOSTERING ENTREPRENEURIAL INTENTION AMONG STUDENTS

    Directory of Open Access Journals (Sweden)

    PEREZ Lucía

    2017-05-01

    Full Text Available Entrepreneurial intention among university students may be conditioned by following training activities related to entrepreneurship during the course of their degree studies. There has clearly been an increase in the number of university graduates who become entrepreneurs, so it is necessary to determine the services that should be offered by the university as a platform to support university entrepreneurship. This research examines this issue through the use of statistical analyses. The main objective of this research is to determine the different types of entrepreneurial training offered to students and the services they think the university should establish as a platform to support entrepreneurship, thereby enabling a comparison of current and desired practices. The study determines whether access to training activities conditions the entrepreneurial intention of university students. Descriptive statistics have been used to conveniently present the information and to identify behavioral patterns of the variables analyzed. Data have thus been examined using frequency analysis, contingency tables and independence tests. The variables used in this survey are designed to represent the role of the university in fostering entrepreneurial culture and the intention among the university community to start their own business, having first extensively analyzed the concept of an entrepreneurial university

  13. Improving SPAWAR PEO C4I Organizational Alignment to Better Enable Enterprise Technical Risk Management

    Science.gov (United States)

    2017-03-01

    ENABLE ENTERPRISE TECHNICAL RISK MANAGEMENT Steven C. Crosson Civilian, Department of the Navy B.C.E., University of Delaware, 2004 M.S...Defense Acquisition University DOD Department of Defense ERM enterprise risk management ETR enterprise technical risk ETRB Enterprise Technical...emphasis that there are even graduate programs offering master’s degrees in enterprise risk management showing up at American universities such as

  14. Frequency noise in frequency swept fiber laser

    DEFF Research Database (Denmark)

    Pedersen, Anders Tegtmeier; Rottwitt, Karsten

    2013-01-01

    This Letter presents a measurement of the spectral content of frequency shifted pulses generated by a lightwave synthesized frequency sweeper. We found that each pulse is shifted in frequency with very high accuracy. We also discovered that noise originating from light leaking through the acousto...

  15. Enabling Routes as Context in Mobile Services

    DEFF Research Database (Denmark)

    Brilingaite, Agne; Jensen, Christian Søndergaard; Zokaite, Nora

    2004-01-01

    With the continuing advances in wireless communications, geo-positioning, and portable electronics, an infrastructure is emerging that enables the delivery of on-line, location-enabled services to very large numbers of mobile users. A typical usage situation for mobile services is one characterized...

  16. Enabling Routes as Context in Mobile Services

    DEFF Research Database (Denmark)

    Brilingaite, Agne; Jensen, Christian Søndergaard; Zokaite, Nora

    With the continuing advances in wireless communications, geo-positioning, and portable electronics, an infrastructure is emerging that enables the delivery of on-line, location-enabled services to very large numbers of mobile users. A typical usage situation for mobile services is one characterized...

  17. Universal metamaterial absorbe

    CERN Document Server

    Smaali, Rafik; Moreau, Antoine; Taliercio, Thierry; Centeno, Emmanuel

    2016-01-01

    We propose a design for an universal absorber, characterized by a resonance frequency that can be tuned from visible to microwave frequencies independently of the choice of the metal and the dielectrics involved. An almost resonant perfect absorption up to 99.8 % is demonstrated at resonance for all polarization states of light and for a very wide angular aperture. These properties originate from a magnetic Fabry-Perot mode that is confined in a dielectric spacer of $\\lambda/100$ thickness by a metamaterial layer and a mirror. An extraordinary large funneling through nano-slits explains how light can be trapped in the structure. Simple scaling laws can be used as a recipe to design ultra-thin perfect absorbers whatever the materials and the desired resonance wavelength, making our design truly universal.

  18. Frequency of Anabolic Steroids Abuse in Bodybuilder Athletes in Kerman City†This article has been published in the Journal of Rafsanjan University of Medical Sciences in Persian language.

    Science.gov (United States)

    Sepehri, Gholamreza; Mousavi Fard, Majid; Sepehri, Ehsan

    2009-01-01

    Athletes, especially bodybuilders, abuse anabolic steroid drugs to improve their strength and enhance their muscle growth and appearance. This study was conducted to determine the type and frequency of anabolic steroids abuse in bodybuilder athletes in Kerman City. A confidential questionnaire which included demographic data (age, education), name of abused anabolic drug and duration of drug abuse was completed by 202 bodybuilder athletes, and the collected data were analyzed using Chi Square test. A value of p anabolic steroid abuse was 18.8%. The mean period of bodybuilding activity was significantly higher in those used the anabolic drugs (38.8 months), comparing to those did not use any drugs (14.3 months). Oxymetholone was the most common drug used by athletes (42% merely used Oxymetholone). The frequency of anabolic steroids abuse was not related to education and age of the bodybuilder athletes. Bodybuilder athletes in Kerman city abuse anabolic steroids, and the health care system should plan to inform them about anabolic steroid adverse effects.

  19. An analysis of the combination frequencies of constituent medicinal herbs in prescriptions for the treatment of bone and joint disorder in Korean medicine: determination of a group of candidate prescriptions for universal use.

    Science.gov (United States)

    Han, Yoo Kyoung; Kim, Seo Yul; Ahn, Jae Young; Baek, Jin Ung

    2017-12-01

    This study aimed to select prescriptions (mixtures of medicinal herbs) used in the treatment of bone and joint disorders in Korean medicine, and through the analysis of medicinal herb combination frequencies, select a high-frequency medicinal herb combination group for further experimental and clinical research. We systematically searched for terms related to bone and joint disorder in the "Dongeuibogam (Dong yibaojian)", a seminal Korean medicine book. We reviewed the results of published papers regarding the effects in bone and joint disorders (especially in osteoporosis, osteomalacia, osteopenia, rheumatoid arthritis, and degenerative arthritis). In total, 34 candidates of a medicinal herb combination for the treatment of bone and joint disorders(CMHCTBJDs) and nine candidates of a medicinal herb for the treatment of bone and joint disorders(CMHTBJDs) were selected. : The candidates of a medicinal herb combination for the treatment of bone and joint disorders (CMHCTBJDs) and candidates of a medicinal herb for the treatment of bone and joint disorders(CMHTBJDs) proposed in this study can be useful material for text mining to develop natural products with the effects in BJDs and also it has the potential to reduce the experimental and developmental time period.

  20. An analysis of the combination frequencies of constituent medicinal herbs in prescriptions for the treatment of bone and joint disorder in Korean medicine: determination of a group of candidate prescriptions for universal use

    Directory of Open Access Journals (Sweden)

    Yoo Kyoung Han

    2017-12-01

    Full Text Available Background: This study aimed to select prescriptions (mixtures of medicinal herbs used in the treatment of bone and joint disorders in Korean medicine, and through the analysis of medicinal herb combination frequencies, select a high-frequency medicinal herb combination group for further experimental and clinical research. Methods: We systematically searched for terms related to bone and joint disorder in the “Dongeuibogam (Dong yibaojian”, a seminal Korean medicine book. We reviewed the results of published papers regarding the effects in bone and joint disorders (especially in osteoporosis, osteomalacia, osteopenia, rheumatoid arthritis, and degenerative arthritis. Results: In total, 34 candidates of a medicinal herb combination for the treatment of bone and joint disorders(CMHCTBJDs and nine candidates of a medicinal herb for the treatment of bone and joint disorders(CMHTBJDs were selected. Conclusion: : The candidates of a medicinal herb combination for the treatment of bone and joint disorders (CMHCTBJDs and candidates of a medicinal herb for the treatment of bone and joint disorders(CMHTBJDs proposed in this study can be useful material for text mining to develop natural products with the effects in BJDs and also it has the potential to reduce the experimental and developmental time period. Keywords: Dongeuibogam (Dong yi bao gian, Text mining, Bone disorder

  1. Frequency of Blastocystis hominis and other intestinal parasites in stool samples examined at the Parasitology Laboratory of the School of Pharmaceutical Sciences at the São Paulo State University, Araraquara.

    Science.gov (United States)

    Miné, Júlio César; Rosa, João Aristeu da

    2008-01-01

    Blastocystis homins is a protozoan that causes an intestinal infection known as human blastocystosis. This infection is diagnosed by means of parasitological examination of stools and by permanent staining techniques. The present study was developed to evaluate the frequency of Blastocystis hominis infection among inhabitants of the Araraquara region, State of São Paulo, and to compare different methods for investigating this protozoan in feces samples. Evaluations on 503 stool samples were performed by means of direct fresh examination and using the techniques of Faust et al., Lutz and Rugai et al. In addition, the iron hematoxylin, trichrome and modified Kinyoun staining techniques were used. Out of the 503 samples examined, 174 (34.6%) were found to be positive for the presence of intestinal parasites. The most frequent protozoa and helminths were Entamoeba coli (14.6%) and Strongyloides stercoralis (6.7%), respectively. Blastocystis hominis was present in 23 (4.6%) fecal samples, with a predominately pasty consistency and without characterizing a condition of diarrhea. Despite the low frequency of Blastocystis hominis found in the Araraquara region, compared with other regions of Brazil, it is important to perform laboratory diagnostic tests for this protozoan. Its finding in fecal material is indicative of food and drinking water contamination. Since the transmission route for this parasite is accepted to be oral-fecal, this implies that the population needs guidance regarding hygiene and basic sanitation measures as a means for controlling health problems caused by enteroparasites.

  2. Enabling multimode wireless access networks using remote radio heads

    DEFF Research Database (Denmark)

    Kardaras, Georgios; Soler, José; Dittmann, Lars

    2012-01-01

    The deployment of 4G networks is spreading rapidly providing mobile broadband services to the public. 4G technologies are designed to overlay existing 3G networks enabling reusability of several network components. In this way, the coexistence of 3G/4G standards is facilitated. This paper describes...... and management plane. Switching between wireless standards becomes easily feasible through firmware upgrading. Finally, real-time configuration of radio functionalities, such as transmit power, receiver gain, carrier frequency, channel bandwidth and others result in a modular software defined radio platform....... © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering....

  3. Emitter frequency refinement based on maximum likelihood

    Science.gov (United States)

    Xu, Xin; Wang, Huijuan

    2015-07-01

    Frequency estimation via signal sorting is widely recognized as one of the most practical technologies in signal processing. However, the estimated frequencies via signal sorting may be inaccurate and biased due to signal fluctuation under different emitter working modes, problems of transmitter circuit, environmental noises or certain unknown interference sources. Therefore, it has become an important issue to further analyze and refine signal frequencies after signal sorting. To address the above problem, we have brought forward an iterative frequency refinement method based on maximum likelihood. Iteratively, the initial estimated signal frequency values are refined. Experimental results indicate that the refined signal frequencies are more informative than the initial ones. As another advantage of our method, noises and interference sources could be filtered out simultaneously. The efficiency and flexibility enables our method to apply in a wide application area, i.e., communication, electronic reconnaissance and radar intelligence analysis.

  4. Graphene-enabled electrically switchable radar-absorbing surfaces

    Science.gov (United States)

    Balci, Osman; Polat, Emre O.; Kakenov, Nurbek; Kocabas, Coskun

    2015-03-01

    Radar-absorbing materials are used in stealth technologies for concealment of an object from radar detection. Resistive and/or magnetic composite materials are used to reduce the backscattered microwave signals. Inability to control electrical properties of these materials, however, hinders the realization of active camouflage systems. Here, using large-area graphene electrodes, we demonstrate active surfaces that enable electrical control of reflection, transmission and absorption of microwaves. Instead of tuning bulk material property, our strategy relies on electrostatic tuning of the charge density on an atomically thin electrode, which operates as a tunable metal in microwave frequencies. Notably, we report large-area adaptive radar-absorbing surfaces with tunable reflection suppression ratio up to 50 dB with operation voltages <5 V. Using the developed surfaces, we demonstrate various device architectures including pixelated and curved surfaces. Our results provide a significant step in realization of active camouflage systems in microwave frequencies.

  5. Demand as frequency controlled reserve

    Energy Technology Data Exchange (ETDEWEB)

    Xu, Z.; Togeby, M.; OEstergaard, J.

    2008-09-15

    Using demand as frequency controlled reserve (DFR) is an emerging technology which allow demand to participate actively in maintaining the system operation without reducing the energy service delivered to the customer and without need of user interaction. The basic premise is that traditional frequency controlled reserves from power plants and interconnections with neighbouring systems can be costly, slow and not fulfil the need for future power grids with a high share of wind power and fewer central power plants, and an intention to perform flexible operation such as is landing. Electricity demands, on the other hand, have advantages as frequency reserve including fast activation speed, smooth linear activation, low expected costs, and well-dispersed in the distribution grid. The main challenge of DFR is new methods for monitoring the available capacity. This project has investigated the technology of using electricity demands for providing frequency reserve to power systems. Within the project the potential and economy of DFR compatible loads in Denmark has been investigated, control logic has been designed, power system impact has been investigated, potential business models has been evaluated and an implementation strategy has been suggested. The tasks and goals of the project have been successfully accomplished based on which the conclusion and future recommendation are made. This project has developed the DFR technology that enables electricity demands to autonomously disconnect or reconnect to the grid in response to system frequency variations. The developed DFR technology is proved to be a promising technology from several perspectives. Technically, using DFR is feasible to provide reserves and enhance power system frequency control, while fulfilling technical requirements such as linear activation (or reconnection) according to frequency (or time). Environmentally, the DFR technology is pollution free in contrast to traditional reserves from generation

  6. The echo-enabled harmonic generation options for FLASH II

    Energy Technology Data Exchange (ETDEWEB)

    Deng, Haixiao [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Shanghai Inst. of Applied Physics (China); Decking, Winfried; Faatz, Bart [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

    2011-03-15

    FLASH II is an upgrade to the existing free electron laser (FEL) FLASH. The echo-enabled harmonic generation (EEHG) scheme is proposed to be a potential seeding option of FLASH II. In this paper, the possibility of EEHG operation of FLASH II is investigated for the first time. With a combination of existing numerical codes, i.e. a laser-beam interaction code in an undulator (LBICU), a beam tracking code in a chicane (ELEGANT) and an universal FEL simulating code (GENESIS), the effects of beam energy chirp and coherent synchrotron radiation (CSR) on EEHG operation are studied as well. In addition, several interesting issues concerning EEHG simulation are discussed. (orig.)

  7. Technical innovation: Multidimensional computerized software enabled subtraction computed tomographic angiography.

    Science.gov (United States)

    Bhatia, Mona; Rosset, Antoine; Platon, Alexandra; Didier, Dominique; Becker, Christoph D; Poletti, Pierre-Alexandre

    2010-01-01

    Computed tomographic angiography (CTA) is a frequent noninvasive alternative to digital subtraction angiography. We previously reported the development of a new subtraction software to overcome limitations of adjacent bone and calcification in CT angiographic subtraction. Our aim was to further develop and improve this fast and automated computerized software, universally available for free use and compatible with most CT scanners, thus enabling better delineation of vascular structures, artifact reduction, and shorter reading times with potential clinical benefits. This computer-based free software will be available as an open source in the next release of OsiriX at the Web site http://www.osirix-viewer.com.

  8. Developing Access between Universities and Local Community Groups: A University Helpdesk in Action

    Science.gov (United States)

    Hart, Angie; Northmore, Simon; Gerhardt, Chloe; Rodriguez, Polly

    2009-01-01

    In this article, the authors offer the University of Brighton's Community-University Partnership Programme (CUPP) Helpdesk as a model of an "enabling platform" for university-community engagement. Despite the growth of practical and scholarly activity in this area, there is a relative lack of research focused on the processes by which…

  9. Enabling Technology for Small Satellite Launch Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Access to space for Small Satellites is enabled by the use of excess launch capacity on existing launch vehicles. A range of sizes, form factors and masses need to...

  10. Enabling Technology for Small Satellite Launch Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Access to space for Small Satellites is enabled by the use of excess launch capacity on existing launch vehicles. A range of sizes, form factors and masses of small...

  11. Integrated Photonics Enabled by Slow Light

    DEFF Research Database (Denmark)

    Mørk, Jesper; Chen, Yuntian; Ek, Sara

    2012-01-01

    In this talk we will discuss the physics of slow light in semiconductor materials and in particular the possibilities offered for integrated photonics. This includes ultra-compact slow light enabled optical amplifiers, lasers and pulse sources....

  12. Utility Energy Services Contracts: Enabling Documents

    Energy Technology Data Exchange (ETDEWEB)

    None

    2009-05-01

    Utility Energy Services Contracts: Enabling Documents provides materials that clarify the authority for Federal agencies to enter into utility energy services contracts (UESCs), as well as sample documents and resources to ease utility partnership contracting.

  13. Web Enabled DROLS Verity TopicSets

    National Research Council Canada - National Science Library

    Tong, Richard

    1999-01-01

    The focus of this effort has been the design and development of automatically generated TopicSets and HTML pages that provide the basis of the required search and browsing capability for DTIC's Web Enabled DROLS System...

  14. Optical Coherent Receiver Enables THz Wireless Bridge

    DEFF Research Database (Denmark)

    Yu, Xianbin; Liu, Kexin; Zhang, Hangkai

    2016-01-01

    We experimentally demonstrated a 45 Gbit/s 400 GHz photonic wireless communication system enabled by an optical coherent receiver, which has a high potential in fast recovery of high data rate connections, for example, in disaster....

  15. Utility Energy Services Contracts: Enabling Documents

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, Karen; Vasquez, Deb

    2017-01-01

    The Federal Energy Management Program's 'Utility Energy Service Contracts: Enabling Documents' provide legislative information and materials that clarify the authority for federal agencies to enter into utility energy service contracts, or UESCs.

  16. Universe Awareness

    Science.gov (United States)

    Sankatsing Nava, Tibisay; Russo, Pedro

    2015-08-01

    Universe Awareness (UNAWE) is an educational programme coordinated by Leiden University that uses the beauty and grandeur of the Universe to encourage young children, particularly those from an underprivileged background, to have an interest in science and technology and foster their sense of global citizenship from the earliest age.UNAWE's twofold vision uses our Universe to inspire and motivate very young children: the excitement of the Universe provides an exciting introduction to science and technology, while the vastness and beauty of the Universe helps broaden the mind and stimulate a sense of global citizenship and tolerance. UNAWE's goals are accomplished through four main activities: the coordination of a global network of more than 1000 astronomers, teachers and educators from more than 60 countries, development of educational resources, teacher training activities and evaluation of educational activities.Between 2011 and 2013, EU-UNAWE, the European branch of UNAWE, was funded by the European Commission to implement a project in 5 EU countries and South Africa. This project has been concluded successfully. Since then, the global project Universe Awareness has continued to grow with an expanding international network, new educational resources and teacher trainings and a planned International Workshop in collaboration with ESA in October 2015, among other activities.

  17. Paradoxical Leadership to Enable Strategic Agility

    OpenAIRE

    Lewis, M. W.; Andriopoulos, C.; Smith, W. K.

    2014-01-01

    Strategic agility evokes contradictions, such as stability-flexibility, commitment-change, and established routines-novel approaches. These competing demands pose challenges that require paradoxical leadership—practices seeking creative, both/and solutions that can enable fast-paced, adaptable decision making. Why is managing paradox critical to strategic agility? And which practices enable leaders to effectively manage tensions? This article describes the paradoxical nature of strategic agil...

  18. ISS - Enabling Exploration Through Docking Standards

    Science.gov (United States)

    Hatfield, Caris A.

    2011-01-01

    NASA and the ISS partnership are jointly developing a key standard to enable future collaborative exploration. The IDSS is based on flight proven design while incorporating new low impact technology. Low impact technology accommodates a wide range of vehicle contact and capture conditions. This standard will get early demonstration on the ISS. Experience gained here will enable operational experience and the opportunity to refine the standard.

  19. Enabling Sustainable NESHAP Compliance for Army Installations

    Science.gov (United States)

    2009-05-07

    including the Chemical Agent Resistant Coating (CARC) system  Solvents, thinners and cleaners  Depainting materials (a.k.a., paint strippers ...or work practice standards UNCLASSIFIED UNCLASSIFIED Enabling DLSME NESHAP Compliance: Methylene Chloride (MeCl) Depainting (1) What we are doing...50% growth cap for large vats; usage cap outside of vats UNCLASSIFIED UNCLASSIFIED Enabling DLSME NESHAP Compliance: Methylene Chloride (MeCl

  20. The universe

    CERN Document Server

    Osborne, Richard

    2012-01-01

    Where did the Universe come from? The single biggest and most difficult question that there is. From early religions through Greek Philosophy and Western Science man has attempted to discover the meaning of our place in the Universe. In the last twenty years these debates have been cast in a new light by amazing discoveries, big bang theory and ideas about new sub-atomic layers. The nature of Time and Space are truly up for grabs. With a witty and accessible style Osborne leads us on a historical and informative journey through the philosophies of the universe including the importance

  1. Co-incident insertion enables high efficiency genome engineering in mouse embryonic stem cells.

    Science.gov (United States)

    Shy, Brian R; MacDougall, Matthew S; Clarke, Ryan; Merrill, Bradley J

    2016-09-19

    CRISPR/Cas9 nucleases have enabled powerful, new genome editing capabilities; however, the preponderance of non-homologous end joining (NHEJ) mediated repair events over homology directed repair (HDR) in most cell types limits the ability to engineer precise changes in mammalian genomes. Here, we increase the efficiency of isolating precise HDR-mediated events in mouse embryonic stem (ES) cells by more than 20-fold through the use of co-incidental insertion (COIN) of independent donor DNA sequences. Analysis of on:off-target frequencies at the Lef1 gene revealed that bi-allelic insertion of a PGK-Neo cassette occurred more frequently than expected. Using various selection cassettes targeting multiple loci, we show that the insertion of a selectable marker at one control site frequently coincided with an insertion at an unlinked, independently targeted site, suggesting enrichment of a sub-population of HDR-proficient cells. When individual cell events were tracked using flow cytometry and fluorescent protein markers, individual cells frequently performed either a homology-dependent insertion event or a homology-independent event, but rarely both types of insertions in a single cell. Thus, when HDR-dependent selection donors are used, COIN enriches for HDR-proficient cells among heterogeneous cell populations. When combined with a self-excising selection cassette, COIN provides highly efficient and scarless genome editing. © The Author(s) 2016. Published by Oxford University Press on behalf of Nucleic Acids Research.

  2. USAID University

    Data.gov (United States)

    US Agency for International Development — USAID University is USAID's learning management system. Features include 1) Access online courses 2) Register for instructor-led courses 3)Access your student...

  3. Multiple Frequency Parametric Sonar

    Science.gov (United States)

    2015-09-28

    300003 1 MULTIPLE FREQUENCY PARAMETRIC SONAR STATEMENT OF GOVERNMENT INTEREST [0001] The invention described herein may be manufactured and...a method for increasing the bandwidth of a parametric sonar system by using multiple primary frequencies rather than only two primary frequencies...2) Description of Prior Art [0004] Parametric sonar generates narrow beams at low frequencies by projecting sound at two distinct primary

  4. Conceptual Model of Technology-Enabled Creative Learning Community

    Directory of Open Access Journals (Sweden)

    Dawam Dwi Jatmiko Suwawi

    2017-05-01

    Full Text Available This paper proposes a definition of Creative Learning Community (CLC that is enabled with technology and its conceptual model in Graduate School of Telkom University. As rooted to learning community term, CLC is defined as a teaching and learning approach within a learning community that consists of a group of students and faculty member that uses creative learning concept. This study adapts the Design Science Research Framework in Information System by Hevner et al to build the conceptual model. First, the study synthesizes existing literature on learning community and creative learning community to define CLC term. Second, based on a review of previous studies and books on learning community, creative thinking, group creativity, engaged learning, student learning outcomes and technology supporting creative learning community, the author analyzes construct candidates of the model. Third, after selecting constructs from the candidates, the study continues by designing the conceptual model of technology-enabled creative learning community. The model was tested the implementations of learning community in Graduate School of Telkom University. The findings provide several conceptual and managerial insights into the role of technology in supporting creative learning community. Future work will need to evaluate the model in the context of other engineering.

  5. Multi-frequency excitation

    KAUST Repository

    Younis, Mohammad I.

    2016-03-10

    Embodiments of multi-frequency excitation are described. In various embodiments, a natural frequency of a device may be determined. In turn, a first voltage amplitude and first fixed frequency of a first source of excitation can be selected for the device based on the natural frequency. Additionally, a second voltage amplitude of a second source of excitation can be selected for the device, and the first and second sources of excitation can be applied to the device. After applying the first and second sources of excitation, a frequency of the second source of excitation can be swept. Using the methods of multi- frequency excitation described herein, new operating frequencies, operating frequency ranges, resonance frequencies, resonance frequency ranges, and/or resonance responses can be achieved for devices and systems.

  6. Multifractal Flood Frequency Analysis

    Science.gov (United States)

    Tchiguirinskaia, I.; Schertzer, D.; Lovejoy, S.

    2007-12-01

    Hydrology and more generally sciences involved in water resources management, researches and technological or operational development face a fundamental difficulty: the extreme variability of hydrological fields. It clearly appears today that this variability is a function of the observation scale and yield natural hazards such as floods or droughts. The estimation of return periods for extreme precipitation and flooding events requires a model of the natural (unperturbed) statistical behaviour of the probability tails and the possible clustering (including possible long-range dependencies) of the extremes. Appropriate approaches for handling such non classical variability over wide ranges of time and space scale do exist. They are based on a fundamental property of the non-linear equations: scale invariance. Its specific framework is that of multifractals. In this framework hydrological variability builds up scale by scale leading to non-classical statistics; this provides the key element needed to better understand and predict floods. Scaling is a verifiable physical principle which can be exploited to model hydrological processes and estimate their statistics over wide ranges of space-time scales. We first present the Multifractal Flood Frequency Analysis (MFFA) tool and illustrate some results of its application to a large database (for more than 16000 selected stations over USA and Canada). We then discuss its efficiency by showing how the mean flow information - coupled with universal multifractal parametrizations with power law tails - can be used to estimate return times for extreme flood events.

  7. Low-Cost Small Payload Return to Enable High Frequency ISS Research Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Terminal Velocity Aerospace, LLC (TVA) proposes to improve utilization of the International Space Station (ISS) by providing a system for on-demand return of...

  8. Numerical and Analytical Analysis of Elastic Rotor Natural Frequency

    Directory of Open Access Journals (Sweden)

    Adis J. Muminovic

    2014-11-01

    Full Text Available In this paper simulation model which enables quick analysis of elastic rotor natural frequency modes is developed using Matlab. This simulation model enables users to get dependency diagram of natural frequency in relation to diameter and length of the rotor,density of the material or modulus of elasticity. Testing of the model is done using numerical analysis in SolidWorks software.

  9. Graphene-enabled electrically switchable radar absorbing surfaces

    Science.gov (United States)

    Balci, Osman; Polat, Emre Ozan; Kakenov, Nurbek; Kocabas, Coskun

    2015-03-01

    Radar absorbing materials are used in stealth technologies for concealment of an object from radar detection. Resistive and/or magnetic composite materials are used to reduce the backscattered microwave signals. Inability to control electrical properties of these materials however, hinders the realization of active camouflage systems which require adaptive surfaces operating in microwave frequencies. Here, using large-area graphene electrodes, we demonstrate a new class of active surfaces which enables unprecedented ability to control reflection, transmission and absorption of microwaves by electrical means. Instead of tuning bulk material property, our strategy relies on electrostatic tuning of the charge density on an atomically thin electrode which operates as a tunable metal in microwave frequencies. Notably, we fabricated large area adaptive radar absorbing surfaces with tunable reflection suppression ratio up to 50 dB with operation voltages less than 5 V. These electrically switchable radar absorbing surfaces provide a significant step in realization of active camouflage systems and adaptive cloaking in microwave frequencies, which cannot be realized by conventional materials.

  10. University Internationalization and University Autonomy

    DEFF Research Database (Denmark)

    Turcan, Romeo V.; Gulieva, Valeria

    2016-01-01

    are determined by the structure and exercise of university autonomy settings at home and in the host countries, and that the process itself cannot be successfully achieved and maintained without changes in the autonomy settings. The key question the authors ask is to what degree universities, in embracing new......, dissimilar, and sometimes conflicting dimensions of the financial, legal, organisational, staffing, and academic autonomy of the host country, are compromising key aspects of their own autonomy and core mission?...

  11. Nanomaterial-Enabled Wearable Sensors for Healthcare.

    Science.gov (United States)

    Yao, Shanshan; Swetha, Puchakayala; Zhu, Yong

    2018-01-01

    Highly sensitive wearable sensors that can be conformably attached to human skin or integrated with textiles to monitor the physiological parameters of human body or the surrounding environment have garnered tremendous interest. Owing to the large surface area and outstanding material properties, nanomaterials are promising building blocks for wearable sensors. Recent advances in the nanomaterial-enabled wearable sensors including temperature, electrophysiological, strain, tactile, electrochemical, and environmental sensors are presented in this review. Integration of multiple sensors for multimodal sensing and integration with other components into wearable systems are summarized. Representative applications of nanomaterial-enabled wearable sensors for healthcare, including continuous health monitoring, daily and sports activity tracking, and multifunctional electronic skin are highlighted. Finally, challenges, opportunities, and future perspectives in the field of nanomaterial-enabled wearable sensors are discussed. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  12. Enabling the Discovery of Gravitational Radiation

    Science.gov (United States)

    Isaacson, Richard

    2017-01-01

    The discovery of gravitational radiation was announced with the publication of the results of a physics experiment involving over a thousand participants. This was preceded by a century of theoretical work, involving a similarly large group of physicists, mathematicians, and computer scientists. This huge effort was enabled by a substantial commitment of resources, both public and private, to develop the different strands of this complex research enterprise, and to build a community of scientists to carry it out. In the excitement following the discovery, the role of key enablers of this success has not always been adequately recognized in popular accounts. In this talk, I will try to call attention to a few of the key ingredients that proved crucial to enabling the successful discovery of gravitational waves, and the opening of a new field of science.

  13. Heterogeneous IP Ecosystem enabling Reuse (HIER)

    Science.gov (United States)

    2017-03-22

    realization of radio-frequency circuits , the interface is typically defined by an im- pedance value that corresponds to the characteristic impedance of the...transmission line that is used at the interface; in most cases, this is 50 Ohms. In on-chip RF circuits , the interface between various blocks may or...may not be 50 Ohms. For instance, in typical RFIC receivers, the low- noise amplifier (LNA) is directly connected to the frequency down-conversion

  14. College students' barriers and enablers for healthful weight management: a qualitative study.

    Science.gov (United States)

    Greaney, Mary L; Less, Faith D; White, Adrienne A; Dayton, Sarah F; Riebe, Deborah; Blissmer, Bryan; Shoff, Suzanne; Walsh, Jennifer R; Greene, Geoffrey W

    2009-01-01

    To identify barriers and enablers for healthful weight management among college students. Sixteen on-line focus groups, homogeneous by sex and university. Eight universities in 8 states. College students (N = 115; 55% female; mean age 19.7 +/- 1.6). Qualitative software, Nvivo version 2 (QSR International, Victoria, Australia, 2002), was used; similar codes were grouped together and categorized using an ecological model. Males and females cited the same barriers to weight management: intrapersonal (eg, temptation and lack of discipline); interpersonal (social situations); and environmental (eg, time constraints, ready access to unhealthful food). Similar enablers were identified by sex: intrapersonal (eg, regulating food intake, being physically active); interpersonal (social support); and environmental (eg, university's environment supports physical activity). More barriers than enablers were given, indicating that these college students were more sensitive to barriers than the enablers for weight management. Factors viewed by some students as barriers to weight management were viewed as enablers by others. When designing weight management interventions for college students, sex specificity may not be as important as considering that a barrier for one student may be an enabler for another. From an ecological perspective, individually focused interventions must be implemented in conjunction with environmental-level interventions to facilitate behavior change.

  15. Origami-enabled deformable silicon solar cells

    Energy Technology Data Exchange (ETDEWEB)

    Tang, Rui; Huang, Hai; Liang, Hanshuang; Liang, Mengbing [School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States); Tu, Hongen; Xu, Yong [Electrical and Computer Engineering, Wayne State University, 5050 Anthony Wayne Dr., Detroit, Michigan 48202 (United States); Song, Zeming; Jiang, Hanqing, E-mail: hanqing.jiang@asu.edu [School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287 (United States); Yu, Hongyu, E-mail: hongyu.yu@asu.edu [School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States); School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287 (United States)

    2014-02-24

    Deformable electronics have found various applications and elastomeric materials have been widely used to reach flexibility and stretchability. In this Letter, we report an alternative approach to enable deformability through origami. In this approach, the deformability is achieved through folding and unfolding at the creases while the functional devices do not experience strain. We have demonstrated an example of origami-enabled silicon solar cells and showed that this solar cell can reach up to 644% areal compactness while maintaining reasonable good performance upon cyclic folding/unfolding. This approach opens an alternative direction of producing flexible, stretchable, and deformable electronics.

  16. Initiating Debate: Towards a cosmopolitan African university ...

    African Journals Online (AJOL)

    In this article I offer a defence of cosmopolitanism as an enabling condition for university education in Africa. Recent xenophobic outbursts in South Africa suggests that the enactment of defensible virtues in societies remain distant from the practices of many people. My contention is that university education ought to take ...

  17. The Changing Shape of Corporate Universities

    Science.gov (United States)

    Baucus, David; Baucus, Melissa

    2005-01-01

    About seven years ago, technological innovation gave rise to the e-learning industry and the growth of corporate universities. Early in the evolution of the industry, corporate universities represented a reasonable deployment of learning technologies. They enabled companies to deliver the right content to target markets (e.g., employees, partners,…

  18. Frequency selectivity at very low centre frequencies

    DEFF Research Database (Denmark)

    Orellana, Carlos Andrés Jurado; Pedersen, Christian Sejer; Marquardt, Torsten

    2010-01-01

    measurements based on OAE suppression techniques and notched-noise masking data psychophysically measured for centre frequencies in the range 50-125 Hz, this study examines how individual differences in frequency selectivity, as well as in masking, may occur at very low CFs due to individual differences...... in the shape of the METFs, thought to be affected by the helicotrema impedance. Preliminary analysis indicates that individual differences in the METFs might underlay the observed individual differences in frequency selectivity. Main effects predicted by the calculations are a pronounced flattening off...

  19. Wideband FM Demodulation and Multirate Frequency Transformations

    Science.gov (United States)

    2016-12-15

    University of New Mexico 1700 Lomas Blvd NE Albuquerque, NM 87106-3807 15 Dec 2016 Final Report APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS...NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER University of New Mexico 1700 Lomas Blvd NE Albuquerque, NM 87106-3807 9. SPONSORING...efficiently filter out the high frequency noise in the corrupted IF estimation. When the signal to noise ratio (SNR) is high, the improvement becomes

  20. Intermediate Frequency Hydro-acoustic Signal Simulation

    Directory of Open Access Journals (Sweden)

    I. A. Rozanov

    2016-01-01

    Full Text Available HIL-modeling is an efficient tool to improve mathematical and algorithmic support and software of sonar complexes at the stages of laboratory and pre-factory tests. In real time simulation a balance has to be struck between the approximation of the physical process and the computer performance of the system that is used for modeling. The authors have offered a modeling method of hydro-acoustic signals at the point of receiver of a sonar complex system at heterodyne frequency and developed a mathematical model of the most typical signals in the field of active sonar. The model differs from the known ones by the lower requirements for computer performance, which is necessary to improve the accuracy and to ensure the adequacy of the model and signal samples in real time. The offered model is generic and can be extended. Thus, it can be adapted for solving the specific tasks taking into consideration a set of the article's assumptions and restrictions formulated regarding the proposed modeling method. A real-world application of the model expects not only software development and enhance- ment, but also operation supervision of on-board control systems of the sonar complexes during acceptance tests at the factory. An agile mechanism to control the parameters of a location and water medium object enables providing complete test coverage of all the states of the system to be controlled. The experiments in processing of received signals based on the on-board control system of the sonar complex have been implemented within the framework of a number of the research and development activities conducted by the Research Institute of Informatics and Control Systems at Bauman Moscow State University. Authors' further research is to be aimed at model development via enhancing the set of ele- mentary sonar signals generated, as well as at optimizing their computation time and increasing the model accuracy.

  1. Enabling DRM-preserving Digital content Redistribution

    NARCIS (Netherlands)

    Krishnan Nair, S.; Popescu, B.C.; Gamage, C.D.; Crispo, B.; Tanenbaum, A.S.

    2005-01-01

    Traditionally, the process of online digital content distribution has involved a limited number of centralised distributors selling protected contents and licenses authorising the use of the se contents, to consumers. In this paper, we extend this model by introducing a security scheme that enables

  2. Creating an Economically Enabling and Competitive Business ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Creating an Economically Enabling and Competitive Business Environment in the West Bank and Gaza Strip. The prospect of indefinite Israeli occupation of the ... Impact of implementing the Palestinian banking law on the performance of the private sector [Arabic language]. Documents. Impact of the commercial agents law ...

  3. Interaction between COCHLEATA and UNIFOLIATA genes enables ...

    Indian Academy of Sciences (India)

    Home; Journals; Journal of Genetics; Volume 90; Issue 2. Interaction between COCHLEATA and UNIFOLIATA genes enables normal flower morphogenesis in the garden pea, Pisum sativum. Sushil Kumar Vishakha Sharma Swati Chaudhary Renu Kumari Nisha Kumari Poonam Mishra. Research Note Volume 90 Issue 2 ...

  4. Extreme Networks' 10-Gigabit Ethernet enables

    CERN Multimedia

    2002-01-01

    " Extreme Networks, Inc.'s 10-Gigabit switching platform enabled researchers to transfer one Terabyte of information from Vancouver to Geneva across a single network hop, the world's first large-scale, end-to-end transfer of its kind" (1/2 page).

  5. Creating an Economically Enabling and Competitive Business ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Creating an Economically Enabling and Competitive Business Environment in the West Bank and Gaza Strip. The prospect of indefinite Israeli occupation of the Palestinian territories, and their extreme ... Country(s). Middle East, North of Sahara, South of Sahara, Central Asia, Far East Asia, South Asia, Palestine ...

  6. 75 FR 13235 - IP-Enabled Services

    Science.gov (United States)

    2010-03-19

    ... From the Federal Register Online via the Government Publishing Office FEDERAL COMMUNICATIONS COMMISSION 47 CFR Part 63 IP-Enabled Services AGENCY: Federal Communications Commission ACTION: Final rule... interconnected Voice over Internet Protocol (VoIP) service the discontinuance obligations that apply to domestic...

  7. Caring at home until death: enabled determination.

    Science.gov (United States)

    Robinson, Carole A; Bottorff, Joan L; McFee, Erin; Bissell, Laura J; Fyles, Gillian

    2017-04-01

    The importance of family caregivers in providing palliative care at home and in supporting a home death is well supported. Gaining a better understanding of what enables palliative family caregivers to continue caring at home for their family members until death is critical to providing direction for more effective support. The purpose of the study was to describe the experiences of bereaved family caregivers whose terminally ill family members with advanced cancer were successful in achieving a desired home death. A qualitative interpretive descriptive approach was used. Data were collected using semi-structured, audio-recorded interviews conducted in-person or via telephone in addition to field notes and reflective journaling. The study took place in British Columbia, Canada, and included 29 bereaved adult family caregivers who had provided care for a family member with advanced cancer and experienced a home death. Four themes captured the experience of caring at home until death: context of providing care, supportive antecedents to providing care, determination to provide care at home, and enabled determination. Factors that enabled determination to achieve a home death included initiation of formal palliative care, asking for and receiving help, augmented care, relief or respite, and making the healthcare system work for the ill person. Clarifying caregiving goals and supporting the factors that enable caregiver determination appear to be critical in enhancing the likelihood of a desired home death.

  8. School Bureaucracies That Work: Enabling, Not Coercive.

    Science.gov (United States)

    Hoy, Wayne K.; Sweetland, Scott R.

    2000-01-01

    Attempts to reconcile two theoretically opposing perspectives of bureaucracy (as either alienating or facilitative) by creating and testing a new construct called "enabling bureaucracy." Empirical results are encouraging. Schools can be designed with formalized procedures and hierarchical structures that help rather than hinder teaching and…

  9. Enablers & Barriers for Realizing Modularity Benefits

    DEFF Research Database (Denmark)

    Storbjerg, Simon Haahr; Brunø, Thomas Ditlev; Thyssen, Jesper

    2012-01-01

    are the organizational and systems related aspects. Recognizing the need for guidance to realize the benefits of modularity, the purpose of this study is through a literature study and a case study to improve the insight into the organizational and systems related enablers and barriers with regard to obtaining the full...

  10. Enabling Efficient Intelligence Analysis in Degraded Environments

    Science.gov (United States)

    2013-06-01

    When facing decisions in underdeveloped, degraded, and denied environments, commanders are likely to rely even more heavily on efficient intelligence ... analysis . Unfortunately, most of the time, the data gathered in these environments will be uncertain, ambiguous, and incomplete. Tools enabling fast

  11. Universities 2035

    Science.gov (United States)

    Thrift, Nigel

    2016-01-01

    This paper examines the future of Western higher education. Situated midway between an analysis and a polemic, it concerns itself with how we might begin to actively design the universities of the future. That will require a productionist account of higher education which is so far sadly lacking. But there are signs that such an account might be…

  12. Physical exam frequency

    Science.gov (United States)

    ... medlineplus.gov/ency/article/002125.htm Physical exam frequency To use the sharing features on this page, ... screening; Checkup Images Blood pressure check Physical exam frequency References Atkins D, Barton M. The periodic health ...

  13. Associations of HLA-A, HLA-B and HLA-C Alleles Frequency with Prevalence of Herpes Simplex Virus Infections and Diseases Across Global Populations: Implication for the Development of an Universal CD8+ T-Cell Epitope-Based Vaccine

    Science.gov (United States)

    Samandary, Sarah; Kridane-Miledi, Hédia; Sandoval, Jacqueline S.; Choudhury, Zareen; Langa-Vives, Francina; Spencer, Doran; Chentoufi, Aziz A.; Lemonnier, François A.; BenMohamed, Lbachir

    2014-01-01

    A significant portion of the world’s population is infected with herpes simplex virus type 1 and/or type 2 (HSV-1 and/or HSV-2), that cause a wide range of diseases including genital herpes, oro-facial herpes, and the potentially blinding ocular herpes. While the global prevalence and distribution of HSV-1 and HSV-2 infections cannot be exactly established, the general trends indicate that: (i) HSV-1 infections are much more prevalent globally than HSV-2; (ii) Over half billion people worldwide are infected with HSV-2; (iii) the sub-Saharan African populations account for a disproportionate burden of genital herpes infections and diseases; (iv) the dramatic differences in the prevalence of herpes infections between regions of the world appear to be associated with differences in the frequencies of human leukocyte antigen (HLA) alleles. The present report: (i) analyzes the prevalence of HSV-1 and HSV-2 infections across various regions of the world; (ii) analyzes potential associations of common HLA-A, HLA-B and HLA-C alleles with the prevalence of HSV-1 and HSV-2 infections in the Caucasoid, Oriental, Hispanic and Black major populations; and (iii) discusses how our recently developed HLA-A, HLA-B, and HLA-C transgenic/H-2 class I null mice will help validate HLA/herpes prevalence associations. Overall, high prevalence of herpes infection and disease appears to be associated with high frequency of HLA-A*24, HLA-B*27, HLA-B*53 and HLA-B*58 alleles. In contrast, low prevalence of herpes infection and disease appears to be associated with high frequency of HLA-B*44 allele. The finding will aid in developing a T-cell epitope-based universal herpes vaccine and immunotherapy. PMID:24798939

  14. Static electromagnetic frequency changers

    CERN Document Server

    Rozhanskii, L L

    1963-01-01

    Static Electromagnetic Frequency Changers is about the theory, design, construction, and applications of static electromagnetic frequency changers, devices that used for multiplication or division of alternating current frequency. It is originally published in the Russian language. This book is organized into five chapters. The first three chapters introduce the readers to the principles of operation, the construction, and the potential applications of static electromagnetic frequency changers and to the principles of their design. The two concluding chapters use some hitherto unpublished work

  15. Frequency reference in VSAT

    Science.gov (United States)

    Cheah, Jonathon Y. C.

    1994-02-01

    A low cost technique of frequency reference distribution within a VSAT network is discussed. This technique allows the use of a modestly frequency stable oscillator as the master frequency reference in the hub of a star-connected VSAT network. The need for extremely frequency stable OCXOs in VSATs is completely avoided. This technique was successfully incorporated in the early commercial VSAT networks. It contributes partially to the low cost nature of some of the VSAT networks available today.

  16. Modeling Frequency Comb Sources

    Directory of Open Access Journals (Sweden)

    Li Feng

    2016-06-01

    Full Text Available Frequency comb sources have revolutionized metrology and spectroscopy and found applications in many fields. Stable, low-cost, high-quality frequency comb sources are important to these applications. Modeling of the frequency comb sources will help the understanding of the operation mechanism and optimization of the design of such sources. In this paper,we review the theoretical models used and recent progress of the modeling of frequency comb sources.

  17. Making Sense of Frequency.

    Science.gov (United States)

    Larsen-Freeman, Diane

    2002-01-01

    Responds to Ellis (2002), which focuses on frequency in language processing, language use, and language acquisition. Contextualizes the frequency factor in terms of the evolution of second language acquisition (SLA) research. Suggests that although relevant and important, the frequency factor requires greater definition and qualification.…

  18. Cover/Frequency (CF)

    Science.gov (United States)

    John F. Caratti

    2006-01-01

    The FIREMON Cover/Frequency (CF) method is used to assess changes in plant species cover and frequency for a macroplot. This method uses multiple quadrats to sample within-plot variation and quantify statistically valid changes in plant species cover, height, and frequency over time. Because it is difficult to estimate cover in quadrats for larger plants, this method...

  19. Eastern Frequency Response Study

    Energy Technology Data Exchange (ETDEWEB)

    Miller, N.W.; Shao, M.; Pajic, S.; D' Aquila, R.

    2013-05-01

    This study was specifically designed to investigate the frequency response of the Eastern Interconnection that results from large loss-of-generation events of the type targeted by the North American Electric Reliability Corp. Standard BAL-003 Frequency Response and Frequency Bias Setting (NERC 2012a), under possible future system conditions with high levels of wind generation.

  20. The frequency polygon reconsidered.

    NARCIS (Netherlands)

    van Casteren, P.H.F.M.

    1997-01-01

    The frequency polygon is not compatible with the given frequency distribution in the sense that the areas within the classes are not proportional to the frequencies. As a consequence, the polygon is too flat. Therefore, an alternative polygon is constructed as a continuous version of the histogram

  1. Broadband frequency conversion

    DEFF Research Database (Denmark)

    Sanders, Nicolai Højer; Jensen, Ole Bjarlin; Dam, Jeppe Seidelin

    We demonstrate a method for frequency conversion of broadly tunable or broad bandwidth light in a static, passive setup. Using simple optical components like lenses, mirrors and gratings and a BiBO crystal as the nonlinear material, we are able to frequency double a single-frequency, tunable...

  2. Composite metamaterial enabled excellent performance of microstrip antenna array

    Science.gov (United States)

    Tang, Ming-Chun; Xiao, Shao-Qiu; Guan, Jian; Bai, Yan-Ying; Gao, Shan-Shan; Wang, Bing-Zhong

    2010-07-01

    This paper reports that the split ring resonators and complementary split ring resonators are compounded to construct a novel compact composite metamaterial. The composite metamaterial exhibits a unique property of blocking electromagnetic wave propagating in two directions near the resonant frequency. An example of two-element microstrip antenna array demonstrates that the developed metamaterial enables array performance that is an improvement in comparison with the traditional one, including mutual coupling suppression of 9.07 dB, remarkable side lobe suppression and gain improvement of 2.14 dB. The mechanism of performance enhancement is analysed based on the electric field and Poynting vector distributions in array. The present work not only is a meaningful exploration of new type composite metamaterial design, but also opens up possibilities for extensive metamaterial applications to antenna engineer.

  3. Securing the Use of RFID-Enabled Banknotes

    Science.gov (United States)

    Martínez, Santi; Roig, Concepció; Valls, Magda

    The use of RFID tags (radio-frequency identification tags) in banknotes presents a main challenge that may discourage their usage: how to avoid a possible attacker to count the amount of tags. Such a drawback is faced in this paper by designing an appropriate Medium Access Control (MAC) for this scenario. A MAC is the set of mechanisms and protocols that allows devices to share the communication channel. In a RFID system, a MAC protocol makes it possible for several tags to communicate within a common environment with the RFID reader. In this paper, we present a new MAC protocol that is suitable for ensuring security in the use of RFID-enabled banknotes. It also guarantees privacy and fits scalability requirements when the number of tags is increasing.

  4. Systems and Methods for RFID-Enabled Pressure Sensing Apparatus

    Science.gov (United States)

    Fink, Patrick W. (Inventor); Lin, Gregory Y. (Inventor); Kennedy, Timothy F. (Inventor); Ngo, Phong H. (Inventor)

    2017-01-01

    Methods, apparatuses and systems for radio frequency identification (RFID)-enabled information collection are disclosed, including an enclosure, a collector coupled to the enclosure, an interrogator, a processor, and one or more RFID field sensors, each having an individual identification, disposed within the enclosure. In operation, the interrogator transmits an incident signal to the collector, causing the collector to generate an electromagnetic field within the enclosure. The electromagnetic field is affected by one or more influences. RFID sensors respond to the electromagnetic field by transmitting reflected signals containing the individual identifications of the responding RFID sensors to the interrogator. The interrogator receives the reflected signals, measures one or more returned signal strength indications ("RSSI") of the reflected signals and sends the RSSI measurements and identification of the responding RFID sensors to the processor to determine one or more facts about the influences. Other embodiments are also described.

  5. Systems and Methods for RFID-Enabled Dispenser

    Science.gov (United States)

    Fink, Patrick W. (Inventor); Lin, Gregory Y. (Inventor); Kennedy, Timothy F. (Inventor); Ngo, Phong H. (Inventor); Byerly, Diane (Inventor)

    2015-01-01

    Methods, apparatuses and systems for radio frequency identification (RFID)-enabled information collection are disclosed, including an enclosure, a collector coupled to the enclosure, an interrogator, a processor, and one or more RFID field sensors, each having an individual identification, disposed within the enclosure. In operation, the interrogator transmits an incident signal to the collector, causing the collector to generate an electromagnetic field within the enclosure. The electromagnetic field is affected by one or more influences. RFID sensors respond to the electromagnetic field by transmitting reflected signals containing the individual identifications of the responding RFID sensors to the interrogator. The interrogator receives the reflected signals, measures one or more returned signal strength indications ("RSSI") of the reflected signals and sends the RSSI measurements and identification of the responding RFID sensors to the processor to determine one or more facts about the influences. Other embodiments are also described.

  6. System and Method for RFID-Enabled Information Collection

    Science.gov (United States)

    Fink, Patrick W. (Inventor); Lin, Gregory Y. (Inventor); Kennedy, Timothy F. (Inventor); Ngo, Phong H. (Inventor); Byerly, Diane (Inventor)

    2016-01-01

    Methods, apparatuses and systems for radio frequency identification (RFID)-enabled information collection are disclosed, including an enclosure, a collector coupled to the enclosure, an interrogator, a processor, and one or more RFID field sensors, each having an individual identification, disposed within the enclosure. In operation, the interrogator transmits an incident signal to the collector, causing the collector to generate an electromagnetic field within the enclosure. The electromagnetic field is affected by one or more influences. RFID sensors respond to the electromagnetic field by transmitting reflected signals containing the individual identifications of the responding RFID sensors to the interrogator. The interrogator receives the reflected signals, measures one or more returned signal strength indications ("RSSI") of the reflected signals and sends the RSSI measurements and identification of the responding RFID sensors to the processor to determine one or more facts about the influences. Other embodiments are also described.

  7. Fast Hopping Frequency Generation in Digital CMOS

    CERN Document Server

    Farazian, Mohammad; Gudem, Prasad S

    2013-01-01

    Overcoming the agility limitations of conventional frequency synthesizers in multi-band OFDM ultra wideband is a key research goal in digital technology. This volume outlines a frequency plan that can generate all the required frequencies from a single fixed frequency, able to implement center frequencies with no more than two levels of SSB mixing. It recognizes the need for future synthesizers to bypass on-chip inductors and operate at low voltages to enable the increased integration and efficiency of networked appliances. The author examines in depth the architecture of the dividers that generate the necessary frequencies from a single base frequency and are capable of establishing a fractional division ratio.   Presenting the first CMOS inductorless single PLL 14-band frequency synthesizer for MB-OFDMUWB makes this volume a key addition to the literature, and with the synthesizer capable of arbitrary band-hopping in less than two nanoseconds, it operates well within the desired range on a 1.2-volt power s...

  8. Marijuana consumption in students of a Colombian university

    National Research Council Canada - National Science Library

    Quimbayo-Díaz, José H; Olivella-Fernández, Madeleine C

    2013-01-01

    Describe pattern of behavior associated with the consumption of marijuana in students of the University of Tolima, Colombia, identifying their sociodemographic characteristics, knowledge, frequency...

  9. Frequency selective infrared sensors

    Science.gov (United States)

    Davids, Paul; Peters, David W

    2013-05-28

    A frequency selective infrared (IR) photodetector having a predetermined frequency band. The exemplary frequency selective photodetector includes: a dielectric IR absorber having a first surface and a second surface substantially parallel to the first surface; an electrode electrically coupled to the first surface of the dielectric IR absorber; and a frequency selective surface plasmonic (FSSP) structure formed on the second surface of the dielectric IR absorber. The FSSP structure is designed to selectively transmit radiation in the predetermined frequency band that is incident on the FSSP structure substantially independent of the angle of incidence of the incident radiation on the FSSP structure.

  10. GTL Based Internet of Things Enable Processor Specific RAM Design on 65nm FPGA

    DEFF Research Database (Denmark)

    Moudgil, Aditi; Garg, Kanika; Pandey, Bishwajeet

    2015-01-01

    and searching the most energy efficient among them. We observed that when we use 3.6 GHz operating frequency, there is 90.2% reduction in I/O power when we used GTL instead of GTLP_DCI. We are inserting 128-bit IP address in RAM to make internet of things enable RAM. Finally, we are operating our IOTs Enable......In this work, we are making Energy Efficient Internet of Things (IoTs) Enable RAM. In order to make it energy efficient, we are using Gunning Transceiver Logic (GTL) IO Standard and Gunning Transceiver Logic Plus (GTLP). We are using the 4 different members of GTL and GTLP IO standards family...... RAM with different operating frequency of I3, I5, I7, Moto-E and Moto-X....

  11. Universal randomness

    Energy Technology Data Exchange (ETDEWEB)

    Dotsenko, Viktor S [Landau Institute for Theoretical Physics, Russian Academy of Sciences, Moscow (Russian Federation)

    2011-03-31

    In the last two decades, it has been established that a single universal probability distribution function, known as the Tracy-Widom (TW) distribution, in many cases provides a macroscopic-level description of the statistical properties of microscopically different systems, including both purely mathematical ones, such as increasing subsequences in random permutations, and quite physical ones, such as directed polymers in random media or polynuclear crystal growth. In the first part of this review, we use a number of models to examine this phenomenon at a simple qualitative level and then consider the exact solution for one-dimensional directed polymers in a random environment, showing that free energy fluctuations in such a system are described by the universal TW distribution. The second part provides detailed appendix material containing the necessary mathematical background for the first part. (reviews of topical problems)

  12. University writing

    Directory of Open Access Journals (Sweden)

    Miguel Zabalza Beraza

    2013-01-01

    Full Text Available Writing in the University is a basic necessity and a long-range educational purpose. One of the basic characteristics of the university context is that it requires writing both as a tool of communication and as a source of intellectual stimulation. After establishing the basic features of academic writing, this article analyzes the role of writing for students (writing to learn and for teachers (write to plan, to reflect, to document what has been done. The article also discusses the contributions of writing for both students and teachers together: writing to investigate. Finally, going beyond what writing is as academic tool, we conclude with a more playful and creative position: writing for pleasure and enjoyment.

  13. Principles for Enabling Deep Secondary Design

    DEFF Research Database (Denmark)

    Hansen, Magnus Rotvit Perlt; Pries-Heje, Jan

    and techniques in a hospital. Our analysis of the two cases leads to the identification of four principles of design implementation that primary designers can apply to enable secondary design and four corresponding design implementation principles that secondary designers themselves need to apply.......User-based redesign after implementation has been studied in many contexts gone by many different names, such as appropriation of technology, malleable design and secondary design. The phenomenon of redesigning content has mainly revolved around technologies such as Facebook, Twitter, or Wikipedia...... or portal-based technology with configuration abilities, with very little focus on technologies where users can change both functionality, content and the level of technology complexity. We coin this type of secondary design deep secondary design. In this paper, we investigate how to enable deep secondary...

  14. Femtosecond laser enabled keratoplasty for advanced keratoconus

    Directory of Open Access Journals (Sweden)

    Yathish Shivanna

    2013-01-01

    Full Text Available Purpose : To assess the efficacy and advantages of femtosecond laser enabled keratoplasty (FLEK over conventional penetrating keratoplasty (PKP in advanced keratoconus. Materials and Methods: Detailed review of literature of published randomized controlled trials of operative techniques in PKP and FLEK. Results: Fifteen studies were identified, analyzed, and compared with our outcome. FLEK was found to have better outcome in view of better and earlier stabilization uncorrected visual acuity (UCVA, best corrected visual acuity (BCVA, and better refractive outcomes with low astigmatism as compared with conventional PKP. Wound healing also was noticed to be earlier, enabling early suture removal in FLEK. Conclusions: Studies relating to FLEK have shown better results than conventional PKP, however further studies are needed to assess the safety and intraoperative complications of the procedure.

  15. Femtosecond laser enabled keratoplasty for advanced keratoconus.

    Science.gov (United States)

    Shivanna, Yathish; Nagaraja, Harsha; Kugar, Thungappa; Shetty, Rohit

    2013-08-01

    To assess the efficacy and advantages of femtosecond laser enabled keratoplasty (FLEK) over conventional penetrating keratoplasty (PKP) in advanced keratoconus. Detailed review of literature of published randomized controlled trials of operative techniques in PKP and FLEK. Fifteen studies were identified, analyzed, and compared with our outcome. FLEK was found to have better outcome in view of better and earlier stabilization uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), and better refractive outcomes with low astigmatism as compared with conventional PKP. Wound healing also was noticed to be earlier, enabling early suture removal in FLEK. Studies relating to FLEK have shown better results than conventional PKP, however further studies are needed to assess the safety and intraoperative complications of the procedure.

  16. Enabling Automatic Certification of Online Auctions

    Directory of Open Access Journals (Sweden)

    Wei Bai

    2014-04-01

    Full Text Available We consider the problem of building up trust in a network of online auctions by software agents. This requires agents to have a deeper understanding of auction mechanisms and be able to verify desirable properties of a given mechanism. We have shown how these mechanisms can be formalised as semantic web services in OWL-S, a good enough expressive machine-readable formalism enabling software agents, to discover, invoke, and execute a web service. We have also used abstract interpretation to translate the auction's specifications from OWL-S, based on description logic, to COQ, based on typed lambda calculus, in order to enable automatic verification of desirable properties of the auction by the software agents. For this language translation, we have discussed the syntactic transformation as well as the semantics connections between both concrete and abstract domains. This work contributes to the implementation of the vision of agent-mediated e-commerce systems.

  17. Enabling Sustainable Improvement in IT Entrepreneurship

    Directory of Open Access Journals (Sweden)

    Paul E. Renaud

    2013-06-01

    Full Text Available Firms must embrace processes that enable the information technology (IT function to become a strategic partner to the business functions it serves. Process ambidexterity is a way for processes to be augmented to improve alignment and adaptability to new markets and technologies. By applying the principles of process ambidexterity, the key elements required for sustainable change within the capabilities that comprise the IT function of the firm are identified. Furthermore, the scope and depth of the dysfunction that is widespread across large firms that depend upon IT are outlined to provide a contextual basis for presenting a solution framework to address sustainable change. This framework for sustainable change is of primary benefit to IT executives seeking to systematically transform the IT function and enable IT entrepreneurship.

  18. University physics

    CERN Document Server

    Arfken, George

    1984-01-01

    University Physics provides an authoritative treatment of physics. This book discusses the linear motion with constant acceleration; addition and subtraction of vectors; uniform circular motion and simple harmonic motion; and electrostatic energy of a charged capacitor. The behavior of materials in a non-uniform magnetic field; application of Kirchhoff's junction rule; Lorentz transformations; and Bernoulli's equation are also deliberated. This text likewise covers the speed of electromagnetic waves; origins of quantum physics; neutron activation analysis; and interference of light. This publi

  19. Wavelet-enabled progressive data Access and Storage Protocol (WASP)

    Science.gov (United States)

    Clyne, J.; Frank, L.; Lesperance, T.; Norton, A.

    2015-12-01

    Current practices for storing numerical simulation outputs hail from an era when the disparity between compute and I/O performance was not as great as it is today. The memory contents for every sample, computed at every grid point location, are simply saved at some prescribed temporal frequency. Though straightforward, this approach fails to take advantage of the coherency in neighboring grid points that invariably exists in numerical solutions to mathematical models. Exploiting such coherence is essential to digital multimedia; DVD-Video, digital cameras, streaming movies and audio are all possible today because of transform-based compression schemes that make substantial reductions in data possible by taking advantage of the strong correlation between adjacent samples in both space and time. Such methods can also be exploited to enable progressive data refinement in a manner akin to that used in ubiquitous digital mapping applications: views from far away are shown in coarsened detail to provide context, and can be progressively refined as the user zooms in on a localized region of interest. The NSF funded WASP project aims to provide a common, NetCDF-compatible software framework for supporting wavelet-based, multi-scale, progressive data, enabling interactive exploration of large data sets for the geoscience communities. This presentation will provide an overview of this work in progress to develop community cyber-infrastructure for the efficient analysis of very large data sets.

  20. An Integrated Conceptual Framework for RFID Enabled Healthcare

    Directory of Open Access Journals (Sweden)

    Gaurav Gupta

    2015-12-01

    Full Text Available Radio frequency identification (RFID technology is a wireless communication technology that facilitates automatic identification and data capture without human intervention. Since 2000s, RFID applications in the health care industry are increasing.  RFID has brought many improvements in areas like patient care, patient safety, equipment tracking, resource utilization, processing time reduction and so on. On the other hand, often deployment of RFID is questioned on the issues like high capital investment, technological complexity, and privacy concerns. Exploration of existing literature indicates the presence of works on the topics like asset management, patient management, staff management, institutional advantages, and organizational issues. However, most of the works are focused on a particular issue. Still now, scholarly attempts to integrate all the facades of RFID-enabled healthcare are limited. In this paper, we propose a conceptual framework that represents the scope for implementation of this technology and the various dimensions of RFID-enabled healthcare and demonstrate them in detail. Also, we have discussed the critical issues that can prove to be potential barriers to its successful implementation and current approaches to resolving these. We also discuss some of the regulatory initiatives encouraging its adoption in the healthcare industry. Also, we have highlighted the future research opportunities in this domain.

  1. Mesh Network Architecture for Enabling Inter-Spacecraft Communication

    Science.gov (United States)

    Becker, Christopher; Merrill, Garrick

    2017-01-01

    To enable communication between spacecraft operating in a formation or small constellation, a mesh network architecture was developed and tested using a time division multiple access (TDMA) communication scheme. The network is designed to allow for the exchange of telemetry and other data between spacecraft to enable collaboration between small spacecraft. The system uses a peer-to-peer topology with no central router, so that it does not have a single point of failure. The mesh network is dynamically configurable to allow for addition and subtraction of new spacecraft into the communication network. Flight testing was performed using an unmanned aerial system (UAS) formation acting as a spacecraft analogue and providing a stressing environment to prove mesh network performance. The mesh network was primarily devised to provide low latency, high frequency communication but is flexible and can also be configured to provide higher bandwidth for applications desiring high data throughput. The network includes a relay functionality that extends the maximum range between spacecraft in the network by relaying data from node to node. The mesh network control is implemented completely in software making it hardware agnostic, thereby allowing it to function with a wide variety of existing radios and computing platforms..

  2. Radio frequency spectrum management

    Science.gov (United States)

    Sujdak, E. J., Jr.

    1980-03-01

    This thesis is a study of radio frequency spectrum management as practiced by agencies and departments of the Federal Government. After a brief introduction to the international agency involved in radio frequency spectrum management, the author concentrates on Federal agencies engaged in frequency management. These agencies include the National Telecommunications and Information Administration (NTIA), the Interdepartment Radio Advisory Committee (IRAC), and the Department of Defense (DoD). Based on an analysis of Department of Defense frequency assignment procedures, recommendations are given concerning decentralizing military frequency assignment by delegating broader authority to unified commanders. This proposal includes a recommendation to colocate the individual Service frequency management offices at the Washington level. This would result in reduced travel costs, lower manpower requirements, and a common tri-Service frequency management data base.

  3. Enabling international adoption of LOINC through translation

    Science.gov (United States)

    Vreeman, Daniel J.; Chiaravalloti, Maria Teresa; Hook, John; McDonald, Clement J.

    2012-01-01

    Interoperable health information exchange depends on adoption of terminology standards, but international use of such standards can be challenging because of language differences between local concept names and the standard terminology. To address this important barrier, we describe the evolution of an efficient process for constructing translations of LOINC terms names, the foreign language functions in RELMA, and the current state of translations in LOINC. We also present the development of the Italian translation to illustrate how translation is enabling adoption in international contexts. We built a tool that finds the unique list of LOINC Parts that make up a given set of LOINC terms. This list enables translation of smaller pieces like the core component “hepatitis c virus” separately from all the suffixes that could appear with it, such “Ab.IgG”, “DNA”, and “RNA”. We built another tool that generates a translation of a full LOINC name from all of these atomic pieces. As of version 2.36 (June 2011), LOINC terms have been translated into 9 languages from 15 linguistic variants other than its native English. The five largest linguistic variants have all used the Part-based translation mechanism. However, even with efficient tools and processes, translation of standard terminology is a complex undertaking. Two of the prominent linguistic challenges that translators have faced include: the approach to handling acronyms and abbreviations, and the differences in linguistic syntax (e.g. word order) between languages. LOINC’s open and customizable approach has enabled many different groups to create translations that met their needs and matched their resources. Distributing the standard and its many language translations at no cost worldwide accelerates LOINC adoption globally, and is an important enabler of interoperable health information exchange PMID:22285984

  4. GPS Enabled Semi-Autonomous Robot

    Science.gov (United States)

    2017-09-01

    AUTONOMOUS ROBOT by Connor F. Bench September 2017 Thesis Advisor: Xiaoping Yun Second Reader: James Calusdian THIS PAGE INTENTIONALLY...AND SUBTITLE GPS ENABLED SEMI-AUTONOMOUS ROBOT 5. FUNDING NUMBERS 6. AUTHOR(S) Connor F. Bench 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES...objective of this research is to integrate GPS and local sensory data to allow a robot to operate semi-autonomously outside of a laboratory environment

  5. Enabling Persistent Peace After Negotiated Settlements

    Science.gov (United States)

    2016-12-01

    ENABLING PERSISTENT PEACE AFTER NEGOTIATED SETTLEMENTS Evert Andres Mejia Lieutenant Colonel, Colombian Marines B.S., Escuela Naval de Cadetes, 2004...simply as “La Violencia .” On April 9, 1948, in the midst of the struggle between the main Colombian liberal and conservative political parties, the...traditional order.”157 “La Violencia ” period between 1948 and 1958 was one of the bloodiest periods in Colombian history,158 characterized by assassinations

  6. Femtosecond laser enabled keratoplasty for advanced keratoconus

    OpenAIRE

    Yathish Shivanna; Harsha Nagaraja; Thungappa Kugar; Rohit Shetty

    2013-01-01

    Purpose : To assess the efficacy and advantages of femtosecond laser enabled keratoplasty (FLEK) over conventional penetrating keratoplasty (PKP) in advanced keratoconus. Materials and Methods: Detailed review of literature of published randomized controlled trials of operative techniques in PKP and FLEK. Results: Fifteen studies were identified, analyzed, and compared with our outcome. FLEK was found to have better outcome in view of better and earlier stabilization uncorrected visual acuity...

  7. IT Enabled Agility in Organizational Ambidexterity

    OpenAIRE

    Röder, Nina; Schermann, Michael; Krcmar, Helmut

    2015-01-01

    The aim of ambidextrous organizations is to balance exploratory and exploitative learning concepts. They innovate through experiments and research, and capture the value of innovations through refinement and continuous improvement. In this paper, we study the relationship of organizational ambidexterity and IT enabled agility. Based on a case study with a German car manufacturer we find that (1) entrepreneurial agility impedes exploitative concepts, (2) adaptive agility impedes exploratory co...

  8. Smart Sensors Enable Smart Air Conditioning Control

    OpenAIRE

    Cheng, Chin-Chi; Lee, Dasheng

    2014-01-01

    In this study, mobile phones, wearable devices, temperature and human motion detectors are integrated as smart sensors for enabling smart air conditioning control. Smart sensors obtain feedback, especially occupants’ information, from mobile phones and wearable devices placed on human body. The information can be used to adjust air conditioners in advance according to humans’ intentions, in so-called intention causing control. Experimental results show that the indoor temperature can be contr...

  9. Enabling international adoption of LOINC through translation.

    Science.gov (United States)

    Vreeman, Daniel J; Chiaravalloti, Maria Teresa; Hook, John; McDonald, Clement J

    2012-08-01

    Interoperable health information exchange depends on adoption of terminology standards, but international use of such standards can be challenging because of language differences between local concept names and the standard terminology. To address this important barrier, we describe the evolution of an efficient process for constructing translations of LOINC terms names, the foreign language functions in RELMA, and the current state of translations in LOINC. We also present the development of the Italian translation to illustrate how translation is enabling adoption in international contexts. We built a tool that finds the unique list of LOINC Parts that make up a given set of LOINC terms. This list enables translation of smaller pieces like the core component "hepatitis c virus" separately from all the suffixes that could appear with it, such "Ab.IgG", "DNA", and "RNA". We built another tool that generates a translation of a full LOINC name from all of these atomic pieces. As of version 2.36 (June 2011), LOINC terms have been translated into nine languages from 15 linguistic variants other than its native English. The five largest linguistic variants have all used the Part-based translation mechanism. However, even with efficient tools and processes, translation of standard terminology is a complex undertaking. Two of the prominent linguistic challenges that translators have faced include: the approach to handling acronyms and abbreviations, and the differences in linguistic syntax (e.g. word order) between languages. LOINC's open and customizable approach has enabled many different groups to create translations that met their needs and matched their resources. Distributing the standard and its many language translations at no cost worldwide accelerates LOINC adoption globally, and is an important enabler of interoperable health information exchange. Copyright © 2012 Elsevier Inc. All rights reserved.

  10. Conference on Enabling Teachers for Entrepreneurship Education

    OpenAIRE

    Silva, Maria do Carmo Vieira da; Reis, Carlos; Pereira, Cristina; Formosinho, Dores; Ferreira, Eduarda; Hoare, Malcolm; Tadeu, Pedro; Gonçalves, Teresa; Paiva, Teresa; Fernández Cruz, Manuel; Afonso, Maria Margarida; Gijón Puerta, José

    2013-01-01

    The Conference on Enabling Teachers for Entrepreneurship Education (ENTENP2013) in Initial Teacher Education (ITE) will be held at the Guarda Polytechnic Institute (GPI) in Guarda on 7/8 June 2013. We expect delegates from all the Portuguese Higher Education Institutions and the EU Member States, as well as Pre-Accession Countries and countries participating in the Competitiveness and Innovation Framework Programme (CIP). ENTENP 2013 addresses to all practitioners from the area of teacher edu...

  11. Computationally driven antibody engineering enables simultaneous humanization and thermostabilization.

    Science.gov (United States)

    Choi, Yoonjoo; Ndong, Christian; Griswold, Karl E; Bailey-Kellogg, Chris

    2016-10-01

    Humanization reduces the immunogenicity risk of therapeutic antibodies of non-human origin. Thermostabilization can be critical for clinical development and application of therapeutic antibodies. Here, we show that the computational antibody redesign method Computationally Driven Antibody Humanization (CoDAH) enables these two goals to be accomplished simultaneously and seamlessly. A panel of CoDAH designs for the murine parent of cetuximab, a chimeric anti-EGFR antibody, exhibited both substantially improved thermostabilities and substantially higher levels of humanness, while retaining binding activity near the parental level. The consistently high quality of the turnkey CoDAH designs, over a whole panel of variants, suggests that the computationally directed approach encapsulates key determinants of antibody structure and function. © The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

  12. The science enabled by the Maunakea Spectroscopic Explorer

    Science.gov (United States)

    Martin, N. F.; Babusiaux, C.

    2017-12-01

    With its unique wide-field, multi-object, and dedicated spectroscopic capabilities, the Maunakea Spectroscopic Explorer (MSE) is a powerful facility to shed light on the faint Universe. Built around an upgrade of the Canada-France Hawaii Telescope (CFHT) to a 11.25-meter telescope with a dedicated ˜1.5 deg^2, 4,000-fiber wide-field spectrograph that covers the optical and near-infrared wavelengths at resolutions between 2,500 and 40,000, the MSE is the essential follow-up complement to the current and next generations of multi-wavelength imaging surveys, such as the LSST, Gaia, Euclid, eROSITA, SKA, and WFIRST, and is an ideal feeder facility for the extremely large telescopes that are currently being built (E-ELT, GMT, and TMT). The science enabled by the MSE is vast and would have an impact on almost all aspects of astronomy research.

  13. Enabling Campus Grids with Open Science Grid Technology

    Science.gov (United States)

    Weitzel, Derek; Bockelman, Brian; Fraser, Dan; Pordes, Ruth; Swanson, David

    2011-12-01

    The Open Science Grid is a recognized key component of the US national cyber-infrastructure enabling scientific discovery through advanced high throughput computing. The principles and techniques that underlie the Open Science Grid can also be applied to Campus Grids since many of the requirements are the same, even if the implementation technologies differ. We find five requirements for a campus grid: trust relationships, job submission, resource independence, accounting, and data management. The Holland Computing Center's campus grid at the University of Nebraska-Lincoln was designed to fulfill the requirements of a campus grid. A bridging daemon was designed to bring non-Condor clusters into a grid managed by Condor. Condor features which make it possible to bridge Condor sites into a multi-campus grid have been exploited at the Holland Computing Center as well.

  14. University lobbying

    Science.gov (United States)

    Richman, Barbara T.

    In the past year, an increasing number of individual academic institutions have lobbied in Congress for new science facilities funds thus circumventing the traditional peer review process of evaluating the merits of such facilities. As an attempt to stem this rising tide, the National Academy of Sciences (NAS) governing council and the Association of American Universities (AAU) recently and independently issued strong statements condemning lobbying by individual universities and enthusiastically supporting the peer review system.“Informed peer judgments on the scientific merits of specific proposals, in open competition, should be a central element in the awarding of all federal funds for science,” the NAS resolution stated. AAU, meanwhile, implored “scientists, leaders of America's universities, and members of Congress” to “refrain from actions that would make scientific decisions a test of political influence rather than a judgment on the quality of the work to be done.” Roughly 50 research institutions constitute AAU; the two AAU Canadian members did not vote on the consortium's statement.

  15. Human universe

    CERN Document Server

    Cox, Brian

    2014-01-01

    Human life is a staggeringly strange thing. On the surface of a ball of rock falling around a nuclear fireball in the blackness of a vacuum the laws of nature conspired to create a naked ape that can look up at the stars and wonder where it came from. What is a human being? Objectively, nothing of consequence. Particles of dust in an infinite arena, present for an instant in eternity. Clumps of atoms in a universe with more galaxies than people. And yet a human being is necessary for the question itself to exist, and the presence of a question in the universe - any question - is the most wonderful thing. Questions require minds, and minds bring meaning. What is meaning? I don't know, except that the universe and every pointless speck inside it means something to me. I am astonished by the existence of a single atom, and find my civilisation to be an outrageous imprint on reality. I don't understand it. Nobody does, but it makes me smile. This book asks questions about our origins, our destiny, and our place i...

  16. Frequency locking in auditory hair cells: Distinguishing between additive and parametric forcing

    Science.gov (United States)

    Edri, Yuval; Bozovic, Dolores; Yochelis, Arik

    2016-10-01

    The auditory system displays remarkable sensitivity and frequency discrimination, attributes shown to rely on an amplification process that involves a mechanical as well as a biochemical response. Models that display proximity to an oscillatory onset (also known as Hopf bifurcation) exhibit a resonant response to distinct frequencies of incoming sound, and can explain many features of the amplification phenomenology. To understand the dynamics of this resonance, frequency locking is examined in a system near the Hopf bifurcation and subject to two types of driving forces: additive and parametric. Derivation of a universal amplitude equation that contains both forcing terms enables a study of their relative impact on the hair cell response. In the parametric case, although the resonant solutions are 1 : 1 frequency locked, they show the coexistence of solutions obeying a phase shift of π, a feature typical of the 2 : 1 resonance. Different characteristics are predicted for the transition from unlocked to locked solutions, leading to smooth or abrupt dynamics in response to different types of forcing. The theoretical framework provides a more realistic model of the auditory system, which incorporates a direct modulation of the internal control parameter by an applied drive. The results presented here can be generalized to many other media, including Faraday waves, chemical reactions, and elastically driven cardiomyocytes, which are known to exhibit resonant behavior.

  17. Web-enabling technologies for the factory floor: a web-enabling strategy for emanufacturing

    Science.gov (United States)

    Velez, Ricardo; Lastra, Jose L. M.; Tuokko, Reijo O.

    2001-10-01

    This paper is intended to address the different technologies available for Web-enabling of the factory floor. It will give an overview of the importance of Web-enabling of the factory floor, in the application of the concepts of flexible and intelligent manufacturing, in conjunction with e-commerce. As a last section, it will try to define a Web-enabling strategy for the application in eManufacturing. This is made under the scope of the electronics manufacturing industry, so every application, technology or related matter is presented under such scope.

  18. University Satellite Consortium and Space Education in Japan Centered on Micro-Nano Satellites

    Science.gov (United States)

    Nakasuka, S.; Kawashima, R.

    2002-01-01

    in Japan especially centered on micro or nano class satellites. Hands-on training using micro-nano satellites provide unique opportunity of space education to university level students, by giving them a chance to experience the whole space project cycle from mission creation, satellite design, fabrication, test, launch, operation through analysis of the results. Project management and team working are other important skills that can be trained in these projects. include 1) low cost, which allows one laboratory in university to carry out a project, 2) short development period such as one or two year, which enables students to obtain the results of their projects before they graduate, and 3) small size and weight, which enables fabrication and test within usually very narrow university laboratory areas. In Japan, several projects such as CanSat, CubeSat or Whale Observation Satellite have been carried out, proving that micro-nano satellites provide very unique and valuable educational opportunity. with the objective to make a university student and staff community of these micro-nano satellite related activities in Japan. This consortium aims for many activities including facilitating information and skills exchange and collaborations between member universities, helping students to use ground test facilities of national laboratories, consulting them on political or law related matters, coordinating joint development of equipments or projects, and bridging between these university activities and the needs or interests of the people in general. This kind of outreach activity is essential because how to create missions of micro-nano satellites should be pursued in order for this field to grow larger than a merely educational enterprise. The final objectives of the consortium is to make a huge community of the users, mission creators, investors and manufactures(i.e., university students) of micro-nano satellites, and provide a unique contribution to the activation of

  19. Radio frequency detection assembly and method for detecting radio frequencies

    Science.gov (United States)

    Cown, Steven H.; Derr, Kurt Warren

    2010-03-16

    A radio frequency detection assembly is described and which includes a radio frequency detector which detects a radio frequency emission produced by a radio frequency emitter from a given location which is remote relative to the radio frequency detector; a location assembly electrically coupled with the radio frequency detector and which is operable to estimate the location of the radio frequency emitter from the radio frequency emission which has been received; and a radio frequency transmitter electrically coupled with the radio frequency detector and the location assembly, and which transmits a radio frequency signal which reports the presence of the radio frequency emitter.

  20. Open University

    CERN Multimedia

    Pentz,M

    1975-01-01

    Michel Pentz est née en Afrique du Sud et venu au Cern en 1957 comme physicien et président de l'associaion du personnel. Il est également fondateur du mouvement Antiapartheid de Genève et a participé à la fondation de l'Open University en Grande-Bretagne. Il nous parle des contextes pédagogiques, culturels et nationaux dans lesquels la méthode peut s'appliquer.

  1. A Wireless Sensor Enabled by Wireless Power

    Science.gov (United States)

    Lee, Da-Sheng; Liu, Yu-Hong; Lin, Chii-Ruey

    2012-01-01

    Through harvesting energy by wireless charging and delivering data by wireless communication, this study proposes the concept of a wireless sensor enabled by wireless power (WPWS) and reports the fabrication of a prototype for functional tests. One WPWS node consists of wireless power module and sensor module with different chip-type sensors. Its main feature is the dual antenna structure. Following RFID system architecture, a power harvesting antenna was designed to gather power from a standard reader working in the 915 MHz band. Referring to the Modbus protocol, the other wireless communication antenna was integrated on a node to send sensor data in parallel. The dual antenna structure integrates both the advantages of an RFID system and a wireless sensor. Using a standard UHF RFID reader, WPWS can be enabled in a distributed area with a diameter up to 4 m. Working status is similar to that of a passive tag, except that a tag can only be queried statically, while the WPWS can send dynamic data from the sensors. The function is the same as a wireless sensor node. Different WPWSs equipped with temperature and humidity, optical and airflow velocity sensors are tested in this study. All sensors can send back detection data within 8 s. The accuracy is within 8% deviation compared with laboratory equipment. A wireless sensor network enabled by wireless power should be a totally wireless sensor network using WPWS. However, distributed WPWSs only can form a star topology, the simplest topology for constructing a sensor network. Because of shielding effects, it is difficult to apply other complex topologies. Despite this limitation, WPWS still can be used to extend sensor network applications in hazardous environments. Further research is needed to improve WPWS to realize a totally wireless sensor network. PMID:23443370

  2. Identifying enabling management practices for employee engagement

    Directory of Open Access Journals (Sweden)

    Marius Joubert

    2011-12-01

    Full Text Available Orientation: A currently emerging viewpoint is that today's management practices no longer add value to organisations. The focus of this article is to conduct a systematic review of the scholarly literature on management practices that could be related to employee engagement. Research purpose: This study searched for evidence in support of the notion of a management value chain, and enabling management practices within each value chain component that could relate to employee engagement. Motivation for the study: An alternative management value chain model could contribute towards a better understanding of which management practices may potentially impact employee engagement. Research design, approach, and method: This is a non-empirical (theoretical study, based on a systematic, in-depth literature review to identify the key management components and enabling practices within this proposed management value chain. Scholarly research databases were sourced for relevant peer reviewed research conducted since 1990, not excluding important contributions prior to 1990. The literature was systematically searched, selected, studied, and contextualized within this study. Main findings: Support was found for the notion of a management value chain, for enabling management practices within each proposed management value chain component, and it was also established these management practices indeed have an impact on employee engagement. Practical/managerial/implications: The possibility that management work can be presented as a generic management value chain allows managers to approach engaging management practices more systematically. Contribution/value-add: This study highlights the importance of some management practices that have never been seen as part of management work.

  3. Product Line Enabled Intelligent Mobile Middleware

    DEFF Research Database (Denmark)

    Zhang, Weishan; Kunz, Thomas; Hansen, Klaus Marius

    2007-01-01

    research project called PLIMM that focuses on user-centered application scenarios. PLIMM is designed based on software product line ideas which make it possible for specialized customization and optimization for different purposes and hardware/software platforms. To enable intelligence, the middleware...... needs access to a range of context models. We model these contexts with OWL, focusing on user-centered concepts. The basic building block of PLIMM is the enhanced BDI agent where OWL context ontology logic reasoning will add indirect beliefs to the belief sets. Our approach also addresses the handling...

  4. Checkpoint/restart-enabled parallel debugging

    Energy Technology Data Exchange (ETDEWEB)

    Hursey, Joshua [Indiana Univ., Bloomington, IN (United States); January, Chris [Allinea Software Ltd., Warwick (United Kingdom); O' Connor, Mark [Allinea Software Ltd., Warwick (United Kingdom); Hargrove, Paul H. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lecomber, David [Allinea Software Ltd., Warwick (United Kingdom); Squyres, Jeffrey M. [Cisco Systems, Inc., San Jose, CA (United States); Lumsdaine, Andrew [Indiana Univ., Bloomington, IN (United States)

    2010-11-12

    Debugging is often the most time consuming part of software development. HPC applications prolong the debugging process by adding more processes interacting in dynamic ways for longer periods of time. Checkpoint/restart- enabled parallel debugging returns the developer to an intermediate state closer to the bug. This focuses the debugging process, saving developers considerable amounts of time, but requires parallel debuggers cooperating with MPI implementations and checkpointers. This paper presents a design specification for such a cooperative relationship. Additionally, this paper discusses the application of this design to the GDB and DDT debuggers, Open MPI, and BLCR projects. © 2010 Springer-Verlag.

  5. Principles for enabling deep secondary design

    DEFF Research Database (Denmark)

    Pries-Heje, Jan; Hansen, Magnus Rotvit Perlt

    2017-01-01

    design by analyzing two cases where secondary designers fundamentally change functionality, content and technology complexity level. The first case redesigns a decision model for agile development in an insurance company; the second creates a contingency model for choosing project management tools...... and techniques in a hospital. Our analysis of the two cases leads to the identification of four principles of design implementation that primary designers can apply to enable secondary design and four corresponding design implementation principles that secondary designers themselves need to apply....

  6. Flexibility-enabling Contracts in Electricity Markets

    DEFF Research Database (Denmark)

    Boscan, Luis; Poudineh, Rahmatallah

    power systems. However, due to presence of high transaction costs, relative to the size of resource, the emerging small resources cannot directly participate in an organised electricity market and/or compete. This paper asks the fundamental question of how should the provision of flexibility, as a multi....... Additionally, along with traditional sources, which already enable flexibility, a number of business models, such as thermostat-based demand response, aggregators and small storage providers, are emerging in electricity markets and expected to constitute important sources of flexibility in future decentralised...

  7. PHM Enabled Autonomous Propellant Loading Operations

    Science.gov (United States)

    Walker, Mark; Figueroa, Fernando

    2017-01-01

    The utility of Prognostics and Health Management (PHM) software capability applied to Autonomous Operations (AO) remains an active research area within aerospace applications. The ability to gain insight into which assets and subsystems are functioning properly, along with the derivation of confident predictions concerning future ability, reliability, and availability, are important enablers for making sound mission planning decisions. When coupled with software that fully supports mission planning and execution, an integrated solution can be developed that leverages state assessment and estimation for the purposes of delivering autonomous operations. The authors have been applying this integrated, model-based approach to the autonomous loading of cryogenic spacecraft propellants at Kennedy Space Center.

  8. Camera-enabled techniques for organic synthesis

    Science.gov (United States)

    Ingham, Richard J; O’Brien, Matthew; Browne, Duncan L

    2013-01-01

    Summary A great deal of time is spent within synthetic chemistry laboratories on non-value-adding activities such as sample preparation and work-up operations, and labour intensive activities such as extended periods of continued data collection. Using digital cameras connected to computer vision algorithms, camera-enabled apparatus can perform some of these processes in an automated fashion, allowing skilled chemists to spend their time more productively. In this review we describe recent advances in this field of chemical synthesis and discuss how they will lead to advanced synthesis laboratories of the future. PMID:23766820

  9. Nonlinear Frequency Compression

    Science.gov (United States)

    Scollie, Susan; Glista, Danielle; Seelisch, Andreas

    2013-01-01

    Frequency lowering technologies offer an alternative amplification solution for severe to profound high frequency hearing losses. While frequency lowering technologies may improve audibility of high frequency sounds, the very nature of this processing can affect the perceived sound quality. This article reports the results from two studies that investigated the impact of a nonlinear frequency compression (NFC) algorithm on perceived sound quality. In the first study, the cutoff frequency and compression ratio parameters of the NFC algorithm were varied, and their effect on the speech quality was measured subjectively with 12 normal hearing adults, 12 normal hearing children, 13 hearing impaired adults, and 9 hearing impaired children. In the second study, 12 normal hearing and 8 hearing impaired adult listeners rated the quality of speech in quiet, speech in noise, and music after processing with a different set of NFC parameters. Results showed that the cutoff frequency parameter had more impact on sound quality ratings than the compression ratio, and that the hearing impaired adults were more tolerant to increased frequency compression than normal hearing adults. No statistically significant differences were found in the sound quality ratings of speech-in-noise and music stimuli processed through various NFC settings by hearing impaired listeners. These findings suggest that there may be an acceptable range of NFC settings for hearing impaired individuals where sound quality is not adversely affected. These results may assist an Audiologist in clinical NFC hearing aid fittings for achieving a balance between high frequency audibility and sound quality. PMID:23539261

  10. Frequency selective terahertz retroreflectors

    Science.gov (United States)

    Williams, Richard James

    The use of novel optical structures operating at terahertz frequencies in industrial and military applications continues to grow. Some of these novel structures include gratings, frequency selective surfaces, metamaterials and metasurfaces, and retroreflectors. A retroreflector is a device that exhibits enhanced backscatter by concentrating the reflected wave in the direction of the source. Retroreflectors have applications in a variety of diverse fields such as aviation, radar systems, antenna technology, communications, navigation, passive identification, and metrology due to their large acceptance angles and frequency bandwidth. This thesis describes the design, fabrication, and characterization of a retroreflector designed for terahertz frequencies and the incorporation of a frequency selective surface in order to endow the retroreflector with narrow-band frequency performance. The radar cross section of several spherical lens reflectors operating at terahertz frequencies was investigated. Spherical lens reflectors with diameters ranging from 2 mm to 8 mm were fabricated from fused silica ball lenses and their radar cross section was measured at 100 GHz, 160 GHz, and 350 GHz. Crossed-dipole frequency selective surfaces exhibiting band-pass characteristics at 350 GHz fabricated from 12 um-thick Nickel screens were applied to the apertures of the spherical lens reflectors. The radar cross section of the frequency selective retroreflectors was measured at 160 GHz and 350 GHz to demonstrate proof-of-concept of narrow-band terahertz performance.

  11. Frequency Response Analysis Tool

    Energy Technology Data Exchange (ETDEWEB)

    Etingov, Pavel V. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Kosterev, Dmitry [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Dai, T. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2014-12-01

    Frequency response has received a lot of attention in recent years at the national level, which culminated in the development and approval of North American Electricity Reliability Corporation (NERC) BAL-003-1 Frequency Response and Frequency Bias Setting Reliability Standard. This report is prepared to describe the details of the work conducted by Pacific Northwest National Laboratory (PNNL) in collaboration with the Bonneville Power Administration and Western Electricity Coordinating Council (WECC) Joint Synchronized Information Subcommittee (JSIS) to develop a frequency response analysis tool (FRAT). The document provides the details on the methodology and main features of the FRAT. The tool manages the database of under-frequency events and calculates the frequency response baseline. Frequency response calculations are consistent with frequency response measure (FRM) in NERC BAL-003-1 for an interconnection and balancing authority. The FRAT can use both phasor measurement unit (PMU) data, where available, and supervisory control and data acquisition (SCADA) data. The tool is also capable of automatically generating NERC Frequency Response Survey (FRS) forms required by BAL-003-1 Standard.

  12. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corspusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Monday 9 March 2009 COLLOQUIUM at 17:00 – Stückelberg Auditorium Are We Descended From Heavy Neutrinos? Prof. Boris Kayser / Fermilab (Fermi National Accelerator Center, Geneva, Illinois, USA) Neutrinos are among the most abundant particles in the universe. The discovery that they have nonzero masses has raised a number of very interesting questions about them, and about their connections to other areas of physics and to cosmology. After briefly reviewing what has been learned about the neutrinos so far, we will identify the major open questions, explain why they are interesting, and discuss ideas and plans for answering them through future experiments. We will highlight a particularly intriguing question: Are neutrinos the key to understanding why the universe contains matter but almost no antimatter, making it s...

  13. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corpusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Wednesday 13 May 2009 PARTICLE PHYSICS SEMINAR at 17:00 – Stückelberg Auditorium Observing the extreme universe with the Fermi Gamma-ray Space Telescope Prof. Olaf Reimer / Stanford University The Fermi Gamma-ray Space Telescope (FGST, formerly GLAST) is an international observatory-type satellite mission with a physics program spanning from gamma-ray astronomy to particle astrophysics and cosmology. FGST was launched on June 11, 2008 and is successfully conducting science observations of the high-energy gamma-ray sky since August 2008. A varienty of discoveries has been made already, including monitoring rapid blazar variability, the existence of GeV gamma-ray bursts, and numerous new gamma-ray sources of different types, including those belonging to previously unknown gamma-ray source classes like msPSRs, globula...

  14. Intrusion Detection in Bluetooth Enabled Mobile Phones

    CSIR Research Space (South Africa)

    Nair, Kishor Krishnan

    2015-11-23

    Full Text Available and Digital Science (MDS), Pretoria, South Africa **Faculty of Engineering, Telkom Centre of Excellence, North-West University, Potchefstroom Campus, South Africa *** Corresponding Author: knair@csir.co.za Abstract— Bluetooth plays a major role in expanding... mobile phones. The Bluetooth Special Interest Group (SIG) has categorized different security modes and levels in its security specification [1]. Although this is the case, in reality, mobile phone manufacturers are the ones who decide the level...

  15. Marketing Strategies of United Kingdom Universities during Clearing and Adjustment

    Science.gov (United States)

    Mogaji, Emmanuel

    2016-01-01

    Purpose: The clearing system in the UK enables students without a university place after exam results have been announced to find suitable vacancies, as it is important for universities to fill their vacancies as any shortfall loses them a lot of money. The purpose of this paper is to examine marketing strategies adopted by UK universities on…

  16. Challenges facing university education in Nigeria: The way forward ...

    African Journals Online (AJOL)

    Challenges facing university education in Nigeria: The way forward. ... of university staff should be reviewed upward to prevent brain drain. An enabling teaching-learning environment is to be assured and the autonomy to universities would help reduce the extent of political interference in the affairs of these institutions.

  17. The Third Role of Australian Universities in Human Capital Formation

    Science.gov (United States)

    Gunasekara, Chrys

    2004-01-01

    The roles of universities have evolved over the last twenty years. Universities were once regarded as focusing on two key roles--teaching and research--which were exogenous to, and independent from, specific economic and social development imperatives. Today, it is increasingly recognised that universities perform important roles as enablers, even…

  18. Blue space geographies: Enabling health in place.

    Science.gov (United States)

    Foley, Ronan; Kistemann, Thomas

    2015-09-01

    Drawing from research on therapeutic landscapes and relationships between environment, health and wellbeing, we propose the idea of 'healthy blue space' as an important new development Complementing research on healthy green space, blue space is defined as; 'health-enabling places and spaces, where water is at the centre of a range of environments with identifiable potential for the promotion of human wellbeing'. Using theoretical ideas from emotional and relational geographies and critical understandings of salutogenesis, the value of blue space to health and wellbeing is recognised and evaluated. Six individual papers from five different countries consider how health can be enabled in mixed blue space settings. Four sub-themes; embodiment, inter-subjectivity, activity and meaning, document multiple experiences within a range of healthy blue spaces. Finally, we suggest a considerable research agenda - theoretical, methodological and applied - for future work within different forms of blue space. All are suggested as having public health policy relevance in social and public space. Copyright © 2015 Elsevier Ltd. All rights reserved.

  19. MENTOR: an enabler for interoperable intelligent systems

    Science.gov (United States)

    Sarraipa, João; Jardim-Goncalves, Ricardo; Steiger-Garcao, Adolfo

    2010-07-01

    A community with knowledge organisation based on ontologies will enable an increase in the computational intelligence of its information systems. However, due to the worldwide diversity of communities, a high number of knowledge representation elements, which are not semantically coincident, have appeared representing the same segment of reality, becoming a barrier to business communications. Even if a domain community uses the same kind of technologies in its information systems, such as ontologies, it doesn't solve its semantics differences. In order to solve this interoperability problem, a solution is to use a reference ontology as an intermediary in the communications between the community enterprises and the outside, while allowing the enterprises to keep their own ontology and semantics unchanged internally. This work proposes MENTOR, a methodology to support the development of a common reference ontology for a group of organisations sharing the same business domain. This methodology is based on the mediator ontology (MO) concept, which assists the semantic transformations among each enterprise's ontology and the referential one. The MO enables each organisation to keep its own terminology, glossary and ontological structures, while providing seamless communication and interaction with the others.

  20. A new method for finding and characterizing galaxy groups via low-frequency radio surveys

    Science.gov (United States)

    Croston, J. H.; Ineson, J.; Hardcastle, M. J.; Mingo, B.

    2017-09-01

    We describe a new method for identifying and characterizing the thermodynamic state of large samples of evolved galaxy groups at high redshifts using high-resolution, low-frequency radio surveys, such as those that will be carried out with LOFAR and the Square Kilometre Array. We identify a sub-population of morphologically regular powerful [Fanaroff-Riley type II (FR II)] radio galaxies and demonstrate that, for this sub-population, the internal pressure of the radio lobes is a reliable tracer of the external intragroup/intracluster medium (ICM) pressure, and that the assumption of a universal pressure profile for relaxed groups enables the total mass and X-ray luminosity to be estimated. Using a sample of well-studied FR II radio galaxies, we demonstrate that our method enables the estimation of group/cluster X-ray luminosities over three orders of magnitude in luminosity to within a factor of ˜2 from low-frequency radio properties alone. Our method could provide a powerful new tool for building samples of thousands of evolved galaxy groups at z > 1 and characterizing their ICM.

  1. Lipid profile frequency and the prevalence of dyslipidaemia from ...

    African Journals Online (AJOL)

    Lipid profile frequency and the prevalence of dyslipidaemia from biochemical tests at Saint Louis University Hospital in Senegal. Dominique Doupa, Abdou Salam Mbengue, Fatou Agne Diallo, Modou Jobe, Arame Ndiaye, Adama Kane, Alassane Diatta, Meissa Touré ...

  2. Geneva University

    CERN Multimedia

    École de physique - Département de physique nucléaire et corspusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Wednesday 18 November  2009 PARTICLE PHYSICS SEMINAR at 17:00 – Stückelberg Auditorium Highlights of the European Strategy Workshop for Future Neutrino Physics Dr Ilias Efthymiopoulos, CERN   Seminar cancelled! Information Organizer : J.-S. Graulich Monday 7 December 2009 PHYSICS COLLOQUIUM at 17:00 – Stückelberg Auditorium Topological insulators and topological superconductors Professor Shoucheng Zhang Department of Physics, Stanford University, CA   Recently, a new class of topological states has been theoretically predicted and experimentally realized. The topological insulators have an insulating gap in the bulk, but have topologically protected edge or surface states due to the time reversal symmetry. In two dimensions the edge s...

  3. Geneva University

    CERN Multimedia

    École de physique - Département de physique nucléaire et corspusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Monday 7 December 2009 PHYSICS COLLOQUIUM at 17:00 – Stückelberg Auditorium Topological insulators and topological superconductors Professor Shoucheng Zhang Department of Physics, Stanford University, CA   Recently, a new class of topological states has been theoretically predicted and experimentally realized. The topological insulators have an insulating gap in the bulk, but have topologically protected edge or surface states due to the time reversal symmetry. In two dimensions the edge states give rise to the quantum spin Hall (QSH) effect, in the absence of any external magnetic field. I shall review the theoretical prediction of the QSH state in HgTe/CdTe semiconductor quantum wells, and its recent experimental observation. The edge states of the QSH state supports fr...

  4. Geneva University

    CERN Multimedia

    2008-01-01

    Ecole de physique - Département de physique nucléaire et corpusculaire 24, Quai Ernest-Ansermet 1211 GENEVE 4 Tél: (022) 379 62 73 Fax: (022) 379 69 92 Monday 28 April 2008 PHYSICS COLLOQUIUM at 17.00 – Stückelberg Auditorium Gravity : an Emergent Perspective by Prof. Thanu Padmanabhan, Pune University Dean, Ganeshkhind, Pune, India I will motivate and describe a novel perspective in which gravity arises as an emergent phenomenon, somewhat like elasticity. This perspective throws light on several issues which are somewhat of a mystery in the conventional approach. Moreover it provides new insights on the dark energy problem. In fact, I will show that it is necessary to have such an alternative perspective in order to solve the cosmological constant problem.Information: http://theory.physics.unige.ch/~fiteo/seminars/COL/collist.html

  5. Electrothermal frequency reference

    NARCIS (Netherlands)

    Makinwa, K.A.A.; Kashmiri, S.M.

    2011-01-01

    An electrothermal frequency-locked loop (EFLL) circuit is described. This EFLL circuit includes an oscillator in a feedback loop. A drive circuit in the EFLL circuit generates a first signal having a fundamental frequency, and an electrothermal filter (ETF) in the EFLL circuit provides a second

  6. Single frequency intracavity SRO

    DEFF Research Database (Denmark)

    Abitan, Haim; Buchhave, Preben

    2000-01-01

    Summary form only given. A single resonance optical parametric oscillator (SRO) is inserted intracavity to a CW high power, single frequency, and ring Nd:YVO4 laser. We obtain a stable single frequency CW SRO with output at 1.7-1.9 μm (idler) and a resonating signal at 2.3-2.6 μm. The behavior...

  7. Magnetostatic wave oscillator frequencies

    Science.gov (United States)

    Sethares, J. C.; Stiglitz, M. R.; Weinberg, I. J.

    1981-03-01

    The frequencies of magnetostatic wave (MSW) oscillators employing three principal modes of propagation, surface (MSSW), forward (MSFVW), and backward (MSBVW) volume waves, have been investigated. Previous (MSW) oscillator papers dealt with MSSW. Oscillators were fabricated using LPE-YIG MSW delay lines in a feedback loop of a 2-4 GHz amplifier. Wide and narrow band transducers were employed. Oscillator frequency as a function of biasing field is in agreement with a theoretical analysis. The analysis predicts frequency in terms of material parameters, biasing field, and transducer geometry. With wide band transducers a comb of frequencies is generated. Narrow band transducers for MSSW and MSFVW select a single mode; and MSBVW selects two modes. Spurious modes, attributed to instrumentation, are more than 20 dB below the main response, and bandwidths are less than 0.005 percent. No other spurious modes are observed. MSW oscillators produce clean electronically tunable signals and appear attractive in frequency agile systems.

  8. Microfabricated ion frequency standard

    Science.gov (United States)

    Schwindt, Peter; Biedermann, Grant; Blain, Matthew G.; Stick, Daniel L.; Serkland, Darwin K.; Olsson, III, Roy H.

    2010-12-28

    A microfabricated ion frequency standard (i.e. an ion clock) is disclosed with a permanently-sealed vacuum package containing a source of ytterbium (Yb) ions and an octupole ion trap. The source of Yb ions is a micro-hotplate which generates Yb atoms which are then ionized by a ultraviolet light-emitting diode or a field-emission electron source. The octupole ion trap, which confines the Yb ions, is formed from suspended electrodes on a number of stacked-up substrates. A microwave source excites a ground-state transition frequency of the Yb ions, with a frequency-doubled vertical-external-cavity laser (VECSEL) then exciting the Yb ions up to an excited state to produce fluorescent light which is used to tune the microwave source to the ground-state transition frequency, with the microwave source providing a precise frequency output for the ion clock.

  9. Microwires enabled metacomposites towards microwave applications

    Energy Technology Data Exchange (ETDEWEB)

    Luo, Y. [Advanced Composites Centre for Innovation and Science, Department of Aerospace Engineering, University of Bristol, University Walk, Bristol, BS8 1TR (United Kingdom); Qin, F.X. [Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China); Scarpa, F. [Advanced Composites Centre for Innovation and Science, Department of Aerospace Engineering, University of Bristol, University Walk, Bristol, BS8 1TR (United Kingdom); Carbonell, J. [Wave Phenomena Group, Universitat Politècnica de Valencia, Camino de Vera, s/n, 46022 Valencia (Spain); Ipatov, M.; Zhukova, V.; Zhukov, A.; Gonzalez, J [Dpto. de Fisica de Materiales, Fac. Quimicas, Universidad del Pais Vasco, San Sebastian 20009 (Spain); Panina, L.V. [School of Novel Materials and Nanotechnology, National University of Science and Technology, MISiS, Moscow 119049 (Russian Federation); Peng, H.X., E-mail: hxpengwork@zju.edu.cn [Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)

    2016-10-15

    The work describes the microwave behavior of polymer composites containing parallel Fe-based and continuous/short-cut Co-based microwire arrays. A magnetic field-tunable metacomposite feature has been identified in the hybrid microwires composite containing 3 mm spaced Co-based wires and confirmed by the presence of transmission windows in the frequency band of 1–3.5 GHz. The magnetically tuned redshift-blueshift in the transmission window is due to the competing dynamic interactions between the different wires and the ferromagnetic resonance of the Fe-based microwires. When the Co-based inter-wire spacing is increased to 10 mm, dual-band transmission windows in the 1.5–3.5 GHz and 9–17 GHz bandwidths were observed. These transmission windows are likely induced by the ferromagnetic resonance of Fe-based wires and the long range dipolar resonance arising between Fe–Co wire couples. The hybridization of parallel Fe-based and short Co-based wires in the composites leads to a significant enhancement of the transmission window in the 1–6 GHz band due to the band-gap nature of the Co-based wires. The hybrid metacomposites containing microwires seem attractive in radio frequency identification application. - Highlights: • Three kinds of hybrid metacomposites containing microwires are fabricated. • Magnetic field-tunable double negative features are observed in 1–3.5 GHz. • Wave transmission enhancement adjacent to band-stop feature is obtained in 1–6 GHz. • Displayed physics are promising for radio frequency identification applications.

  10. Universal Intelligent Small Cell (UnISCell for next generation cellular networks

    Directory of Open Access Journals (Sweden)

    Mohammad Patwary

    2016-11-01

    Full Text Available Exploring innovative cellular architectures to achieve enhanced system capacity and good coverage has become a critical issue towards realizing the next generation of wireless communications. In this context, this paper proposes a novel concept of Universal Intelligent Small Cell (UnISCell for enabling the densification of the next generation of cellular networks. The proposed novel concept envisions an integrated platform of providing a strong linkage between different stakeholders such as street lighting networks, landline telephone networks and future wireless networks, and is universal in nature being independent of the operating frequency bands and traffic types. The main motivating factors for the proposed small cell concept are the need of public infrastructure re-engineering, and the recent advances in several enabling technologies. First, we highlight the main concepts of the proposed UnISCell platform. Subsequently, we present two deployment scenarios for the proposed UnISCell concept considering infrastructure sharing and service sharing as important aspects. We then describe the key future technologies for enabling the proposed UnISCell concept and present a use case example with the help of numerical results. Finally, we conclude this article by providing some interesting future recommendations.

  11. Advanced Antennas Enabled by Electromagnetic Metamaterials

    Science.gov (United States)

    2014-12-01

    using a conventional bias- tec . The RF transformer chosen was the Mini-Circuits TC1-1-13MG2+, which provided minimal insertion loss in the frequency...within the end loads. The feed point is connected to a DC ground through a bias tec on the feed line, and the DC tuning voltages arc applied to the...34 ACS Nano , vol. 5, no. 6, pp. 4641-4647, Jim. 2011. [30] D. Kern, D. Werner, and M. Lisovich, "Metafcrritcs: using electromagnetic bandgap structures

  12. SHG-specificity of cellular Rootletin filaments enables naïve imaging with universal conservation

    Science.gov (United States)

    Akiyama, Toshihiro; Inoko, Akihito; Kaji, Yuichi; Yonemura, Shigenobu; Kakiguchi, Kisa; Segawa, Hiroki; Ishitsuka, Kei; Yoshida, Masaki; Numata, Osamu; Leproux, Philippe; Couderc, Vincent; Oshika, Tetsuro; Kano, Hideaki

    2017-01-01

    Despite growing demand for truly naïve imaging, label-free observation of cilium-related structure remains challenging, and validation of the pertinent molecules is correspondingly difficult. In this study, in retinas and cultured cells, we distinctively visualized Rootletin filaments in rootlets in the second harmonic generation (SHG) channel, integrated in custom coherent nonlinear optical microscopy (CNOM) with a simple, compact, and ultra-broadband supercontinuum light source. This SHG signal was primarily detected on rootlets of connecting cilia in the retinal photoreceptor and was validated by colocalization with anti-Rootletin staining. Transfection of cells with Rootletin fragments revealed that the SHG signal can be ascribed to filaments assembled from the R234 domain, but not to cross-striations assembled from the R123 domain. Consistent with this, Rootletin-depleted cells lacked SHG signal expected as centrosome linker. As a proof of concept, we confirmed that similar fibrous SHG was observed even in unicellular ciliates. These findings have potential for broad applications in clinical diagnosis and biophysical experiments with various organisms.

  13. Enabling University Educators to Equip Students with Inter- and Transdisciplinary Competencies

    Science.gov (United States)

    Di Giulio, Antonietta; Defila, Rico

    2017-01-01

    Purpose: Inter- and transdisciplinarity are core concepts in almost all education for sustainable development (ESD) competence frameworks and curricula. To equip students with inter- and transdisciplinary competencies is highly demanding for educators. Educators must not only know how to teach students such competencies, but need to be experienced…

  14. Enabling Computational Technologies for Terascale Scientific Simulations

    Energy Technology Data Exchange (ETDEWEB)

    Ashby, S.F.

    2000-08-24

    We develop scalable algorithms and object-oriented code frameworks for terascale scientific simulations on massively parallel processors (MPPs). Our research in multigrid-based linear solvers and adaptive mesh refinement enables Laboratory programs to use MPPs to explore important physical phenomena. For example, our research aids stockpile stewardship by making practical detailed 3D simulations of radiation transport. The need to solve large linear systems arises in many applications, including radiation transport, structural dynamics, combustion, and flow in porous media. These systems result from discretizations of partial differential equations on computational meshes. Our first research objective is to develop multigrid preconditioned iterative methods for such problems and to demonstrate their scalability on MPPs. Scalability describes how total computational work grows with problem size; it measures how effectively additional resources can help solve increasingly larger problems. Many factors contribute to scalability: computer architecture, parallel implementation, and choice of algorithm. Scalable algorithms have been shown to decrease simulation times by several orders of magnitude.

  15. Metasurface-Enabled Remote Quantum Interference.

    Science.gov (United States)

    Jha, Pankaj K; Ni, Xingjie; Wu, Chihhui; Wang, Yuan; Zhang, Xiang

    2015-07-10

    An anisotropic quantum vacuum (AQV) opens novel pathways for controlling light-matter interaction in quantum optics, condensed matter physics, etc. Here, we theoretically demonstrate a strong AQV over macroscopic distances enabled by a judiciously designed array of subwavelength-scale nanoantennas-a metasurface. We harness the phase-control ability and the polarization-dependent response of the metasurface to achieve strong anisotropy in the decay rate of a quantum emitter located over distances of hundreds of wavelengths. Such an AQV induces quantum interference among radiative decay channels in an atom with orthogonal transitions. Quantum vacuum engineering with metasurfaces holds promise for exploring new paradigms of long-range light-matter interaction for atom optics, solid-state quantum optics, quantum information processing, etc.

  16. Microsystem enabled photovoltaic modules and systems

    Science.gov (United States)

    Nielson, Gregory N; Sweatt, William C; Okandan, Murat

    2015-05-12

    A microsystem enabled photovoltaic (MEPV) module including: an absorber layer; a fixed optic layer coupled to the absorber layer; a translatable optic layer; a translation stage coupled between the fixed and translatable optic layers; and a motion processor electrically coupled to the translation stage to controls motion of the translatable optic layer relative to the fixed optic layer. The absorber layer includes an array of photovoltaic (PV) elements. The fixed optic layer includes an array of quasi-collimating (QC) micro-optical elements designed and arranged to couple incident radiation from an intermediate image formed by the translatable optic layer into one of the PV elements such that it is quasi-collimated. The translatable optic layer includes an array of focusing micro-optical elements corresponding to the QC micro-optical element array. Each focusing micro-optical element is designed to produce a quasi-telecentric intermediate image from substantially collimated radiation incident within a predetermined field of view.

  17. Enabling plant synthetic biology through genome engineering.

    Science.gov (United States)

    Baltes, Nicholas J; Voytas, Daniel F

    2015-02-01

    Synthetic biology seeks to create new biological systems, including user-designed plants and plant cells. These systems can be employed for a variety of purposes, ranging from producing compounds of industrial or therapeutic value, to reducing crop losses by altering cellular responses to pathogens or climate change. To realize the full potential of plant synthetic biology, techniques are required that provide control over the genetic code - enabling targeted modifications to DNA sequences within living plant cells. Such control is now within reach owing to recent advances in the use of sequence-specific nucleases to precisely engineer genomes. We discuss here the enormous potential provided by genome engineering for plant synthetic biology. Copyright © 2014 Elsevier Ltd. All rights reserved.

  18. Enabling opportunistic resources for CMS Computing Operations

    Energy Technology Data Exchange (ETDEWEB)

    Hufnagel, Dick [Fermilab

    2015-11-19

    With the increased pressure on computing brought by the higher energy and luminosity from the LHC in Run 2, CMS Computing Operations expects to require the ability to utilize “opportunistic” resources — resources not owned by, or a priori configured for CMS — to meet peak demands. In addition to our dedicated resources we look to add computing resources from non CMS grids, cloud resources, and national supercomputing centers. CMS uses the HTCondor/glideinWMS job submission infrastructure for all its batch processing, so such resources will need to be transparently integrated into its glideinWMS pool. Bosco and parrot wrappers are used to enable access and bring the CMS environment into these non CMS resources. Here we describe our strategy to supplement our native capabilities with opportunistic resources and our experience so far using them.

  19. Multifaceted aspects of chunking enable robust algorithms.

    Science.gov (United States)

    Acuna, Daniel E; Wymbs, Nicholas F; Reynolds, Chelsea A; Picard, Nathalie; Turner, Robert S; Strick, Peter L; Grafton, Scott T; Kording, Konrad P

    2014-10-15

    Sequence production tasks are a standard tool to analyze motor learning, consolidation, and habituation. As sequences are learned, movements are typically grouped into subsets or chunks. For example, most Americans memorize telephone numbers in two chunks of three digits, and one chunk of four. Studies generally use response times or error rates to estimate how subjects chunk, and these estimates are often related to physiological data. Here we show that chunking is simultaneously reflected in reaction times, errors, and their correlations. This multimodal structure enables us to propose a Bayesian algorithm that better estimates chunks while avoiding overfitting. Our algorithm reveals previously unknown behavioral structure, such as an increased error correlations with training, and promises a useful tool for the characterization of many forms of sequential motor behavior. Copyright © 2014 the American Physiological Society.

  20. Bluetooth-enabled teleradiology: applications and complications.

    Science.gov (United States)

    Hura, Angela M

    2002-01-01

    Wireless personal area networks and local area networks are becoming increasingly more prevalent in the teleradiology and telemedicine industry. Although there has been much debate about the role that Bluetooth will play in the future of wireless technology, both promoters and doubters acknowledge that Bluetooth will have an impact on networking, even if only as a "niche" product. This article provides an overview of the Bluetooth standard and highlights current and future areas of inclusion for use in a teleradiology environment. The possibilities for Bluetooth in a teleradiology environment without wires are nearly boundless and an overview of current and proposed Bluetooth-enabled radiology equipment and vendors is provided. A comparison of Bluetooth and other wireless technologies is provided, including areas of similarity and potential conflict. Bluetooth and other wireless technologies can not only peacefully coexist but also complement each other and provide enhanced teleradiology services.

  1. Enabling Indoor Location-Based Services

    DEFF Research Database (Denmark)

    Radaelli, Laura

    of trajectory data that can be used to study how people actually use indoor spaces. In this dissertation, we contribute partial solutions that address challenges in indoor positioning and indoor trajectory management and analysis. The key enabler of indoor location-based services and indoor movement analysis...... is a well-functioning positioning system that can be easily deployed in most public places. Different technologies are able to provide indoor positioning with different accuracy and coverage, but it is difficult to find a technology that by itself can provide good positioning in the many different layouts...... of indoor spaces that exhibit more variability than outdoor spaces. We investigate the integration of different technologies for positioning. First, we examine the concept of an organic system, i.e., a system that is initialized and maintained by users, and we extend it in a vision of a fully organic indoor...

  2. Enabling a New Planning and Scheduling Paradigm

    Science.gov (United States)

    Jaap, John; Davis, Elizabeth

    2004-01-01

    The Flight Projects Directorate at NASA's Marshall Space Flight Center is developing a new planning and scheduling environment and a new scheduling algorithm to enable a paradigm shift in planning and scheduling concepts. Over the past 33 years Marshall has developed and evolved a paradigm for generating payload timelines for Skylab, Spacelab, various other Shuttle payloads, and the International Space Station. The current paradigm starts by collecting the requirements, called "tasks models," from the scientists and technologists for the tasks that they want to be done. Because of shortcomings in the current modeling schema, some requirements are entered as notes. Next a cadre with knowledge of vehicle and hardware modifies these models to encompass and be compatible with the hardware model; again, notes are added when the modeling schema does not provide a better way to represent the requirements. Finally, another cadre further modifies the models to be compatible with the scheduling engine. This last cadre also submits the models to the scheduling engine or builds the timeline manually to accommodate requirements that are expressed in notes. A future paradigm would provide a scheduling engine that accepts separate science models and hardware models. The modeling schema would have the capability to represent all the requirements without resorting to notes. Furthermore, the scheduling engine would not require that the models be modified to account for the capabilities (limitations) of the scheduling engine. The enabling technology under development at Marshall has three major components. (1) A new modeling schema allows expressing all the requirements of the tasks without resorting to notes or awkward contrivances. The chosen modeling schema is both maximally expressive and easy to use. It utilizes graphics methods to show hierarchies of task constraints and networks of temporal relationships. (2) A new scheduling algorithm automatically schedules the models

  3. Enabling Radiation Tolerant Systems for Space

    Science.gov (United States)

    Kauffman, Billy; Hardage, Donna

    1999-01-01

    A hazard to all spacecraft orbiting the Earth is the existence of a harsh environment with its subsequent effects. The effects can provide damaging or even disabling effects on spacecraft and its instruments. One of the most recognized and serious of the different space environments is ionizing radiation and its effects on spacecraft and spacecraft systems. This is increasingly becoming more of an issue for all missions due to the use of lighter composite materials, smaller satellites, and smaller electronics. NASA's Space Environments and Effects (SEE) Program was established to develop new plateaus of technical capability to reduce the cost of NASA's missions and provide leading-edge exploratory and focused technology to promote continued U.S. preeminence in space. The SEE Program has an "Implementation Plan" to develop roadmaps and fund technical tasks to enable radiation systems for space.

  4. Health-Enabled Smart Sensor Fusion Technology

    Science.gov (United States)

    Wang, Ray

    2012-01-01

    A process was designed to fuse data from multiple sensors in order to make a more accurate estimation of the environment and overall health in an intelligent rocket test facility (IRTF), to provide reliable, high-confidence measurements for a variety of propulsion test articles. The object of the technology is to provide sensor fusion based on a distributed architecture. Specifically, the fusion technology is intended to succeed in providing health condition monitoring capability at the intelligent transceiver, such as RF signal strength, battery reading, computing resource monitoring, and sensor data reading. The technology also provides analytic and diagnostic intelligence at the intelligent transceiver, enhancing the IEEE 1451.x-based standard for sensor data management and distributions, as well as providing appropriate communications protocols to enable complex interactions to support timely and high-quality flow of information among the system elements.

  5. Grid Enabled Geospatial Catalogue Web Service

    Science.gov (United States)

    Chen, Ai-Jun; Di, Li-Ping; Wei, Ya-Xing; Liu, Yang; Bui, Yu-Qi; Hu, Chau-Min; Mehrotra, Piyush

    2004-01-01

    Geospatial Catalogue Web Service is a vital service for sharing and interoperating volumes of distributed heterogeneous geospatial resources, such as data, services, applications, and their replicas over the web. Based on the Grid technology and the Open Geospatial Consortium (0GC) s Catalogue Service - Web Information Model, this paper proposes a new information model for Geospatial Catalogue Web Service, named as GCWS which can securely provides Grid-based publishing, managing and querying geospatial data and services, and the transparent access to the replica data and related services under the Grid environment. This information model integrates the information model of the Grid Replica Location Service (RLS)/Monitoring & Discovery Service (MDS) with the information model of OGC Catalogue Service (CSW), and refers to the geospatial data metadata standards from IS0 19115, FGDC and NASA EOS Core System and service metadata standards from IS0 191 19 to extend itself for expressing geospatial resources. Using GCWS, any valid geospatial user, who belongs to an authorized Virtual Organization (VO), can securely publish and manage geospatial resources, especially query on-demand data in the virtual community and get back it through the data-related services which provide functions such as subsetting, reformatting, reprojection etc. This work facilitates the geospatial resources sharing and interoperating under the Grid environment, and implements geospatial resources Grid enabled and Grid technologies geospatial enabled. It 2!so makes researcher to focus on science, 2nd not cn issues with computing ability, data locztic, processir,g and management. GCWS also is a key component for workflow-based virtual geospatial data producing.

  6. Ultracold atoms in multiple radio-frequency dressed adiabatic potentials

    Science.gov (United States)

    Harte, T. L.; Bentine, E.; Luksch, K.; Barker, A. J.; Trypogeorgos, D.; Yuen, B.; Foot, C. J.

    2018-01-01

    We present the first experimental demonstration of a multiple radio-frequency dressed potential for the configurable magnetic confinement of ultracold atoms. We load cold 87Rb atoms into a double-well potential with an adjustable barrier height, formed by three radio-frequencies applied to atoms in a static quadrupole magnetic field. Our multiple radio-frequency approach gives precise control over the double-well characteristics, including the depth of individual wells and the height of the barrier, and enables reliable transfer of atoms between the available trapping geometries. We characterize the multiple radio-frequency dressed system using radio-frequency spectroscopy, finding good agreement with the eigenvalues numerically calculated using Floquet theory. This method creates trapping potentials that can be reconfigured by changing the amplitudes, polarizations, and frequencies of the applied dressing fields and easily extended with additional dressing frequencies.

  7. Frequency Stepped Pulse Train Modulated Wind Sensing Lidar

    DEFF Research Database (Denmark)

    Olesen, Anders Sig; Pedersen, Anders Tegtmeier; Rottwitt, Karsten

    2011-01-01

    In this paper a wind sensing lidar utilizing a Frequency Stepped Pulse Train (FSPT) is demonstrated. One of the advantages in the FSTP lidar is that it enables direct measurement of wind speed as a function of distance from the lidar. Theoretically the FSPT lidar continuously produces measurements...... as is the case with a CW lidar, but at the same time with a spatial resolution, and without the range ambiguity originating from e.g. clouds. The FSPT lidar utilizes a frequency sweeping source for generation of the FSPT. The source generates a pulse train where each pulse has an optical carrier frequency...... shifted a set quantity relative to the carrier frequency of the previous pulse. In the scheme presented here, the measured frequency depends on the distance from which the signal originates. The measured frequency is related to the Doppler frequency shift induced by the wind and an integer number...

  8. Transformer-based design techniques for oscillators and frequency dividers

    CERN Document Server

    Luong, Howard Cam

    2016-01-01

    This book provides in-depth coverage of transformer-based design techniques that enable CMOS oscillators and frequency dividers to achieve state-of-the-art performance.  Design, optimization, and measured performance of oscillators and frequency dividers for different applications are discussed in detail, focusing on not only ultra-low supply voltage but also ultra-wide frequency tuning range and locking range.  This book will be an invaluable reference for anyone working or interested in CMOS radio-frequency or mm-Wave integrated circuits and systems.

  9. Structured Light-Matter Interactions Enabled By Novel Photonic Materials

    Energy Technology Data Exchange (ETDEWEB)

    Litchinitser, Natalia [Univ. at Buffalo, NY (United States); Feng, Liang [Univ. at Buffalo, NY (United States)

    2017-05-02

    The synergy of complex materials and complex light is expected to add a new dimension to the science of light and its applications [1]. The goal of this program is to investigate novel phenomena emerging at the interface of these two branches of modern optics. While metamaterials research was largely focused on relatively “simple” linearly or circularly polarized light propagation in “complex” nanostructured, carefully designed materials with properties not found in nature, many singular optics studies addressed “complex” structured light transmission in “simple” homogeneous, isotropic, nondispersive transparent media, where both spin and orbital angular momentum are independently conserved. However, if both light and medium are complex so that structured light interacts with a metamaterial whose optical materials properties can be designed at will, the spin or angular momentum can change, which leads to spin-orbit interaction and many novel optical phenomena that will be studied in the proposed project. Indeed, metamaterials enable unprecedented control over light propagation, opening new avenues for using spin and quantum optical phenomena, and design flexibility facilitating new linear and nonlinear optical properties and functionalities, including negative index of refraction, magnetism at optical frequencies, giant optical activity, subwavelength imaging, cloaking, dispersion engineering, and unique phase-matching conditions for nonlinear optical interactions. In this research program we focused on structured light-matter interactions in complex media with three particularly remarkable properties that were enabled only with the emergence of metamaterials: extreme anisotropy, extreme material parameters, and magneto-electric coupling–bi-anisotropy and chirality.

  10. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corspusculaire 24, quai Ernest-Ansermet 1211 Genève 4 Tél. 022 379 62 73 - Fax: (022) 379 69 92 Wednesday 14 October 2009 PARTICLE PHYSICS SEMINAR at 17:00 – Stückelberg Auditorium Long-lived particle searches at colliders Dr. Philippe Mermod / Oxford University The discovery of exotic long-lived particles would address a number of important questions in modern physics such as the origin and composition of dark matter and the unification of the fundamental forces. This talk will focus on searches for long-lived charged massive particles, where "charged" refers to the magnetic, electric or colour charge. Previous searches at the LEP and Tevatron Colliders allowed to put mass and cross section limits on various kinds of long-lived particles, such as Magnetic Monopoles and metastable leptons and up-type quarks. The new energy regime made available at the LHC will probe physics regions well beyond these limits. F...

  11. Geneva University

    CERN Multimedia

    2008-01-01

    Ecole de physique - Département de physique nucléaire et corpusculaire 24, Quai Ernest-Ansermet 1211 GENEVE 4 Tél: (022) 379 62 73 Fax: (022) 379 69 92 Wednesday 29 October 2008 PARTICLE PHYSICS SEMINAR at 17.00 – Stückelberg Auditorium Precision measurements of low-energy neutrino-nucleus interactions with the SciBooNE experiment at Fermilab by Dr Michel Sorel, IFIC (CSIC and University of Valencia) «Do all modern accelerator-based neutrino experiments need to make use of kiloton-scale detectors and decade-long exposure times? In order to study the full pattern of neutrino mixing via neutrino oscillation experiments, the answer is probably yes, together with powerful proton sources. Still, to push the sensitivity of future neutrino oscillation searches into unchartered territory, those are necessary, but not sufficient, ingredients. In addition, accurate knowledge of neutrino interactions and neutrino production is mandatory. This knowledge can be acquired via small-scale and short-term dedicated n...

  12. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corpusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Lundi 6 avril 2009 PARTICLE PHYSICS SEMINAR àt 17:00 – Auditoire Stückelberg Hospital superbugs, nanomechanics and statistical physics Prof. Dr G. Aeppli / University College London The alarming growth of the antibiotic-resistant superbug, methicillin-resistant Staphylococcus aureus (MRSA) is driving the development of new technologies to investigate antibiotics and their modes of action. We report silicon cantilever based studies of self-assembled monolayers of mucopeptides which model drug-sensitive and resistant bacterial walls. The underlying concepts needed to understand the measurements will simplify the design of cantilevers and coatings for biosensing and could even impact our understanding of drug action on bacteria themselves. (Une verrée en compagnie du conférencier sera offerte après le colloque.) Organizer : Prof. Markus Büttiker ...

  13. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corpusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Wednesday 25 March 2009 PARTICLE PHYSICS SEMINAR at 17:00 – Stückelberg Auditorium Hunting for the Higgs with D0 at the Tevatron Prof. Gustaaf Brooijmans / Columbia University The search for the Higgs boson is one of the most important endeavors in current experimental particle physics. At the eve of the LHC start, the Tevatron is delivering record luminosity allowing both CDF and D0 to explore a new region of possible Higgs masses. In this seminar, the techniques used to search for the Higgs boson at the Tevatron will be explained, limiting factors will be examined, and the sensitivity in the various channels will be reviewed. The newly excluded values of the standard model Higgs mass will be presented. Information : http://dpnc.unige.ch/seminaire/annonce.html Organizer : J.-S. Graulich

  14. Geneva University

    CERN Multimedia

    2010-01-01

    Ecole de physique Département de physique nucléaire et corspusculaire 24, quai Ernest-Ansermet 1211 GENEVE 4 Tel: (022) 379 62 73 Fax: (022) 379 69 92 Wednesday 14 April 2010 PARTICLE PHYSICS SEMINAR at 17.00 hrs – Stückelberg Auditorium Dark Matter and the XENON Experiment By Dr. Marc Schumann, Physik Institut, Universität Zürich There is convincing astrophysical and cosmological evidence that most of the matter in the Universe is dark: It is invisible in every band of the electromagnetic spectrum. Weakly interacting massive particles (WIMPs) are promising Dark Matter candidates that arise naturally in many theories beyond the Standard Model. Several experiments aim to directly detect WIMPs by measuring nuclear recoils from WIMPs scattered on target nuclei. In this talk, I will give an overview on Dark Matter and direct Dark Matter detection. Then I will focus on the XENON100 experiment, a 2-phase liquid/gas time projection chamber (TPC) that ...

  15. Universal algebra

    CERN Document Server

    Grätzer, George

    1979-01-01

    Universal Algebra, heralded as ". . . the standard reference in a field notorious for the lack of standardization . . .," has become the most authoritative, consistently relied on text in a field with applications in other branches of algebra and other fields such as combinatorics, geometry, and computer science. Each chapter is followed by an extensive list of exercises and problems. The "state of the art" account also includes new appendices (with contributions from B. Jónsson, R. Quackenbush, W. Taylor, and G. Wenzel) and a well-selected additional bibliography of over 1250 papers and books which makes this a fine work for students, instructors, and researchers in the field. "This book will certainly be, in the years to come, the basic reference to the subject." --- The American Mathematical Monthly (First Edition) "In this reviewer's opinion [the author] has more than succeeded in his aim. The problems at the end of each chapter are well-chosen; there are more than 650 of them. The book is especially sui...

  16. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corpusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Wednesday 29 April 2009 PARTICLE PHYSICS SEMINAR at 17:00 - Stückelberg Auditorium Search for spin-1 excited bosons at the LHC Mihail V. Chizhov (Physics Department, Sofia University, Bulgaria) I will discuss the resonance production of new type spin-1 excited bosons, Z*, at hadron colliders. They can be observed as a Breit-Wigner resonance peak in the invariant dilepton mass distribution in the same way as the well-known hypothetical gauge bosons, Z�. This makes them very interesting objects for early searches with the LHC first data. Moreover, they have unique signatures in transverse momentum and angular distributions, which allow to distinguish them from other resonances. Information : http://dpnc.unige.ch/seminaire/annonce.html Organizer: J.-S. Graulich

  17. Digital Radio Frequency Memories

    Science.gov (United States)

    Hey-Shipton, Gregory L.

    The Digital RF Memory (DRFM) is gradually replacing the recirculating Frequency Memory Loop (FML). The shortcomings of the FML in the area of limited storage time, single signal processing, and limited ECM capabilities are overcome by the use of the DRFM. There are several architectures for the DRFM but all of them accomplish the same basic function: to convert an incoming RF signal to a low enough frequency to allow storage in a digital memory and subsequent upconversion to the original signal frequency. Multiple signal handling capabilities on a pulse by pulse basis and software controlled ECM generation make the DRFM a powerful addition to any ECM suite.

  18. Broadband frequency conversion

    DEFF Research Database (Denmark)

    Sanders, Nicolai; Jensen, Ole Bjarlin; Tidemand-Lichtenberg, Peter

    We present a simple, passive and static setup for broadband frequency conversion. By using simple optical components like lenses, mirrors and gratings, we obtain the spectral angular dispersion to match the second harmonic generation phasematching angles in a nonlinear BiBO crystal. We are able...... to frequency double a single-frequency diode laser, tunable in the 1020-1090 nm range, with almost equal efficiency for all wavelengths. In the experimental setup, the width of the phasematch was increased with a factor of 50. The method can easily be extended to other wavelength ranges and nonlinear crystals...

  19. Real-time spatial frequency domain imaging by single snapshot multiple frequency demodulation technique

    Science.gov (United States)

    Cao, Zili; Lin, Weihao; Chen, Xinlin; Zeng, Bixin; Xu, Min

    2017-02-01

    We have presented a novel Single Snapshot Multiple Frequency Demodulation (SSMD) method enabling single snapshot wide field imaging of optical properties of turbid media in the Spatial Frequency Domain. SSMD makes use of the orthogonality of harmonic functions and extracts the modulation transfer function (MTF) at multiple modulation frequencies and of arbitrary orientations and amplitudes simultaneously from a single structured-illuminated image at once. SSMD not only increases significantly the data acquisition speed and reduces motion artifacts but also exhibits excellent noise suppression in imaging as well. The performance of SSMD-SFDI is demonstrated with experiments on both tissue mimicking phantoms and in vivo for recovering optical properties. SSMD is ideal in the implementation of a real-time spatial frequency domain imaging platform, which will open up SFDI for vast applications in, for example, mapping the optical properties of a dynamic turbid medium or monitoring fast temporal evolutions.

  20. Enabling occupation at the end of life: A literature review.

    Science.gov (United States)

    Mills, Katherine; Payne, Angela

    2015-12-01

    Occupation, or meaningful activity, can contribute to the well-being and quality of life of all individuals. It is thus a logical tautology that occupation should be enabled for those at the end of life. Our present review examines current provision of these processes by Occupational Therapist, who can be much-valued members of multidisciplinary palliative care teams. Following a literature search and critical selection, 10 global papers were identified examining occupation and occupational therapy at the end of life in the acute, hospice, and community environments. Universally, there appeared to be a dearth of therapists working in end-of-life care. Provision of palliative care in hospitals was found to be compensatory or rehabilitative. Hospice therapy emerged as pleasingly occupational, though the number of hospice places was disappointingly few. Community literature was sparse, so it proved challenging to draw definitive conclusions. Promising research refracted light on occupation at home; however, it also revealed stretched domiciliary services, where clients are not well informed about the potential scope of occupational therapy. A "good death" involving a quality end-of-life experience is the foundational goal overarching all therapy and medicine in the provision of palliative care. Arguably, an occupation-focused approach provided by therapists meets client needs to enable meaningful experiences in the limited time left to them. Current occupational therapy practice environments are not necessarily achieving these goals in commensurate fashion. There is a need to promote the role of occupational therapy and circumscribe what therapists can offer. Further research is necessitated across all environments and future funding for therapist positions in palliative teams. End-of-life care can be complex and challenging; however, therapists can facilitate fulfillment of client-centered occupational goals. In engaging with personally constructed nuances of meaning

  1. Study of the long-term effects of frequency compression by behavioral verbal tests in adults.

    Science.gov (United States)

    Marchesin, Vanessa Clarizia; Iório, Maria Cecília Martinelli

    2015-01-01

    To verify the effect of long-term use of hearing aids with frequency compression for verbal behavior tests and daily activities. Thirty-two adults, aged between 30 and 60 years old, with moderate to severe sensorineural hearing loss at high frequencies with steeply sloping configuration were divided into two groups: 16 with hearing aids with frequency compression algorithm enabled and 16 not enabled. All participants underwent the detection tests of consonant sounds, monosyllable recognition in quiet environments, identification of fricative monosyllables, and Abbreviated Profile of Hearing Aid Benefit (APHAB) questionnaire in five times throughout a 12-month trial. Detection of consonant sounds, recognition of monosyllables in quiet environments and identification of fricative monosyllables improved significantly with frequency compression enabled. Participants had their APHAB scores improved whether they were adapted to the frequency compression or not. Frequency compression provides the anticipated improvement in audibility, detection of high-frequency consonant sounds, and recognition of monosyllables.

  2. Frequency of twinning in Kwara State, North-Central Nigeria

    African Journals Online (AJOL)

    O.A. Iyiola

    2012-10-05

    Oct 5, 2012 ... b Cell Biology and Genetics Unit, Department of Zoology, University of Ibadan, Ibadan, Nigeria ... d Department of Molecular Biology & Biotechnology, University of Sheffield, Firth Court, S10 2TN Sheffield, United Kingdom. Received ... We wish to update the current knowledge on the trend and frequency of.

  3. Europium enabled luminescent nanoparticles for biomedical applications

    Energy Technology Data Exchange (ETDEWEB)

    Syamchand, S.S., E-mail: syamchand.ss@gmail.com; Sony, G., E-mail: emailtosony@gmail.com

    2015-09-15

    Lanthanide based nanoparticles are receiving great attention ought to their excellent luminescent and magnetic properties and find challenging biomedical applications. Among the luminescent lanthanide NPs, europium based NPs (Eu-NPs) are better candidates for immunoassay and imaging applications. The Eu-NPs have an edge over quantum dots (QDs) by means of their stable luminescence, long fluorescence lifetime, sharp emission peaks with narrow band width, lack of blinking and biocompatibility. This review surveys the synthesis and properties of a variety of Eu-NPs consolidated from different research articles, for their applications in medicine and biology. The exquisite luminescent properties of Eu-NPs are explored for developing biomedical applications such as immunoassay and bioimaging including multimodal imaging. The biomedical applications of Eu-NPs are mostly diagnostic in nature and mainly focus on various key analytes present in biological systems. The luminescent properties of europium enabled NPs are influenced by a number of factors such as the site symmetry, the metal nanoparticles, metal ions, quantum dots, surfactants, morphology of Eu-NPs, crystal defect, phenomena like antenna effect and physical parameters like temperature. Through this review we explore and assimilate all the factors which affect the luminescence in Eu-NPs and coil a new thread of parameters that control the luminescence in Eu-NPs, which would provide further insight in developing Eu-based nanoprobes for future biomedical prospects. - Highlights: • The review describes 14 major factors that influence the luminescence properties of europium enabled luminescent nanoparticles (Eu-NPs). • Surveys different types of europium containing nanoparticles that have been reported for their biomedical applications. • Eu-NPs are conveniently divided into four different categories, based on the type of the substrates involved. The four categories are (1) virgin Eu-substrate based NPs; (2

  4. Enabling Wireless Avionics Intra-Communications

    Science.gov (United States)

    Torres, Omar; Nguyen, Truong; Mackenzie, Anne

    2016-01-01

    The Electromagnetics and Sensors Branch of NASA Langley Research Center (LaRC) is investigating the potential of an all-wireless aircraft as part of the ECON (Efficient Reconfigurable Cockpit Design and Fleet Operations using Software Intensive, Networked and Wireless Enabled Architecture) seedling proposal, which is funded by the Convergent Aeronautics Solutions (CAS) project, Transformative Aeronautics Concepts (TAC) program, and NASA Aeronautics Research Institute (NARI). The project consists of a brief effort carried out by a small team in the Electromagnetic Environment Effects (E3) laboratory with the intention of exposing some of the challenges faced by a wireless communication system inside the reflective cavity of an aircraft and to explore potential solutions that take advantage of that environment for constructive gain. The research effort was named EWAIC for "Enabling Wireless Aircraft Intra-communications." The E3 laboratory is a research facility that includes three electromagnetic reverberation chambers and equipment that allow testing and generation of test data for the investigation of wireless systems in reflective environments. Using these chambers, the EWAIC team developed a set of tests and setups that allow the intentional variation of intensity of a multipath field to reproduce the environment of the various bays and cabins of large transport aircraft. This setup, in essence, simulates an aircraft environment that allows the investigation and testing of wireless communication protocols that can effectively be used as a tool to mitigate some of the risks inherent to an aircraft wireless system for critical functions. In addition, the EWAIC team initiated the development of a computational modeling tool to illustrate the propagation of EM waves inside the reflective cabins and bays of aircraft and to obtain quantifiable information regarding the degradation of signals in aircraft subassemblies. The nose landing gear of a UAV CAD model was used

  5. Single frequency semiconductor lasers

    CERN Document Server

    Fang, Zujie; Chen, Gaoting; Qu, Ronghui

    2017-01-01

    This book systematically introduces the single frequency semiconductor laser, which is widely used in many vital advanced technologies, such as the laser cooling of atoms and atomic clock, high-precision measurements and spectroscopy, coherent optical communications, and advanced optical sensors. It presents both the fundamentals and characteristics of semiconductor lasers, including basic F-P structure and monolithic integrated structures; interprets laser noises and their measurements; and explains mechanisms and technologies relating to the main aspects of single frequency lasers, including external cavity lasers, frequency stabilization technologies, frequency sweeping, optical phase locked loops, and so on. It paints a clear, physical picture of related technologies and reviews new developments in the field as well. It will be a useful reference to graduate students, researchers, and engineers in the field.

  6. Lunch frequency among adolescents

    DEFF Research Database (Denmark)

    Pedersen, Trine Pagh; Holstein, Bjørn E; Krølner, Rikke

    2016-01-01

    frequency was most common among students who were boys, 13- and 15-year-olds, from medium and low family social class, descendants of immigrants, living in a single-parent family and in a reconstructed family. School-level analyses suggested that having access to a canteen at school was associated with low......OBJECTIVE: To investigate: (i) how lunch frequency of adolescents varies between schools and between classes within schools; (ii) the associations between frequency of lunch and individual sociodemographic factors and school characteristics; and (iii) if any observed associations between lunch...... frequency and school characteristics vary by gender and age groups. DESIGN: Cross-sectional study in which students and school headmasters completed self-administered questionnaires. Associations were estimated by multilevel multivariate logistic regression. SETTING: The Danish arm of the Health Behaviour...

  7. The Upgraded Tennessee State University 2m Automatic Spectroscopic Telescope

    Science.gov (United States)

    Muterspaugh, Matthew W.; Williamson, M. H.; Fekel, F. C.; Harrison, C.

    2012-01-01

    We recently have completed several upgrades to the Tennessee State University (TSU) 2m automatic spectroscopic telescope (AST), which is located at Fairborn Observatory, Washington Camp, Arizona. A new 4K x 4K Fairchild 486 CCD with 15 micron pixels, housed in a dewar cooled by a CryoTiger refrigeration system, has allowed us to substantially increase the wavelength coverage and greatly reduce the noise of our echelle spectra. A new beam splitter cube has increased the throughput of the system by about 1 magnitude. A recently built instrument head enables us to rapidly switch between commercial fibers of different diameters, allowing us to use different resolutions for different stars. Microlenses, attached to the ends of those fibers, have improved the f-ratio compatibility of the fibers and the spectrograph system. We discuss these enhancements and the resulting throughput improvements. The TSU 2m AST is available for joint projects with outside observers. As a robotic telescope dedicated to spectroscopic observations, the AST provides rare opportunities for observing programs that benefit from high cadences. In its previous incarnation it has participated in several photometric-spectroscopic observing campaigns such as the one completed in 2010 on the B8 supergiant Rigel. Simultaneous with MOST satellite photometry, the 2m AST obtained 442 spectra on 20 nights. This intensive series of spectroscopic observations plus somewhat less numerous spectra, taken for several years before the joint campaign, enabled the identification of Rigel's spectrum of pulsation frequencies.

  8. Enabling the enabler: Using access to information to ensure the right ...

    African Journals Online (AJOL)

    ... the protestinfo.org.za website. The results of these efforts show that compliance with the RGA is uneven. This article explores the flaws in the regulatory environment that have led to this level of apathy within government, despite the crucial role of the right to protest and the right of access to information as enabling rights in ...

  9. Vision and operational concept for enabling advanced traveler information services : market readiness assessment (EnableATIS).

    Science.gov (United States)

    2012-05-01

    The purpose of this market readiness assessment is to identify next steps for USDOT to research, demonstrate and advance the objectives of EnableATIS. This will include demonstrating those key concepts that will be within the USDOT and agency sphere ...

  10. Simple, multiplexed, PCR-based barcoding of DNA enables sensitive mutation detection in liquid biopsies using sequencing.

    Science.gov (United States)

    Ståhlberg, Anders; Krzyzanowski, Paul M; Jackson, Jennifer B; Egyud, Matthew; Stein, Lincoln; Godfrey, Tony E

    2016-06-20

    Detection of cell-free DNA in liquid biopsies offers great potential for use in non-invasive prenatal testing and as a cancer biomarker. Fetal and tumor DNA fractions however can be extremely low in these samples and ultra-sensitive methods are required for their detection. Here, we report an extremely simple and fast method for introduction of barcodes into DNA libraries made from 5 ng of DNA. Barcoded adapter primers are designed with an oligonucleotide hairpin structure to protect the molecular barcodes during the first rounds of polymerase chain reaction (PCR) and prevent them from participating in mis-priming events. Our approach enables high-level multiplexing and next-generation sequencing library construction with flexible library content. We show that uniform libraries of 1-, 5-, 13- and 31-plex can be generated. Utilizing the barcodes to generate consensus reads for each original DNA molecule reduces background sequencing noise and allows detection of variant alleles below 0.1% frequency in clonal cell line DNA and in cell-free plasma DNA. Thus, our approach bridges the gap between the highly sensitive but specific capabilities of digital PCR, which only allows a limited number of variants to be analyzed, with the broad target capability of next-generation sequencing which traditionally lacks the sensitivity to detect rare variants. © The Author(s) 2016. Published by Oxford University Press on behalf of Nucleic Acids Research.

  11. Fuel properties to enable lifted-flame combustion

    Energy Technology Data Exchange (ETDEWEB)

    Kurtz, Eric [Ford Motor Company, Dearborn, MI (United States)

    2015-03-15

    The Fuel Properties to Enable Lifted-Flame Combustion project responded directly to solicitation DE-FOA-0000239 AOI 1A, Fuels and Lubricants for Advanced Combustion Regimes. This subtopic was intended to encompass clean and highly-efficient, liquid-fueled combustion engines to achieve extremely low engine-out nitrogen oxides (NOx) and particulate matter (PM) as a target and similar efficiency as state-of-the-art direct injection diesel engines. The intent of this project was to identify how fuel properties can be used to achieve controllable Leaner Lifted Flame Combustion (LLFC) with low NOx and PM emissions. Specifically, this project was expected to identify and test key fuel properties to enable LLFC and their compatibility with current fuel systems and to enhance combustion models to capture the effect of fuel properties on advanced combustion. Successful demonstration of LLFC may reduce the need for after treatment devices, thereby reducing costs and improving thermal efficiency. The project team consisted of key technical personnel from Ford Motor Company (FMC), the University of Wisconsin-Madison (UW), Sandia National Laboratories (SNL) and Lawrence Livermore National Laboratories (LLNL). Each partner had key roles in achieving project objectives. FMC investigated fuel properties relating to LLFC and sooting tendency. Together, FMC and UW developed and integrated 3D combustion models to capture fuel property combustion effects. FMC used these modeling results to develop a combustion system and define fuel properties to support a single-cylinder demonstration of fuel-enabled LLFC. UW investigated modeling the flame characteristics and emissions behavior of different fuels, including those with different cetane number and oxygen content. SNL led spray combustion experiments to quantify the effect of key fuel properties on combustion characteristics critical for LLFC, as well as single cylinder optical engine experiments to improve fundamental

  12. Design and modeling of inductors, capacitors and coplanar waveguides at tens of GHz frequencies

    CERN Document Server

    Aryan, Naser Pour

    2015-01-01

    This book describes the basic principles of designing and modelling inductors, MIM capacitors and coplanar waveguides at frequencies of several tens of GHz. The author explains the design and modelling of key, passive elements, such as capacitors, inductors and transmission lines that enable high frequency MEMS operating at frequencies in the orders of tens of GHz.

  13. Enabling scientific workflows in virtual reality

    Science.gov (United States)

    Kreylos, O.; Bawden, G.; Bernardin, T.; Billen, M.I.; Cowgill, E.S.; Gold, R.D.; Hamann, B.; Jadamec, M.; Kellogg, L.H.; Staadt, O.G.; Sumner, D.Y.

    2006-01-01

    To advance research and improve the scientific return on data collection and interpretation efforts in the geosciences, we have developed methods of interactive visualization, with a special focus on immersive virtual reality (VR) environments. Earth sciences employ a strongly visual approach to the measurement and analysis of geologic data due to the spatial and temporal scales over which such data ranges, As observations and simulations increase in size and complexity, the Earth sciences are challenged to manage and interpret increasing amounts of data. Reaping the full intellectual benefits of immersive VR requires us to tailor exploratory approaches to scientific problems. These applications build on the visualization method's strengths, using both 3D perception and interaction with data and models, to take advantage of the skills and training of the geological scientists exploring their data in the VR environment. This interactive approach has enabled us to develop a suite of tools that are adaptable to a range of problems in the geosciences and beyond. Copyright ?? 2008 by the Association for Computing Machinery, Inc.

  14. Multimode Communication Protocols Enabling Reconfigurable Radios

    Directory of Open Access Journals (Sweden)

    Berlemann Lars

    2005-01-01

    Full Text Available This paper focuses on the realization and application of a generic protocol stack for reconfigurable wireless communication systems. This focus extends the field of software-defined radios which usually concentrates on the physical layer. The generic protocol stack comprises common protocol functionality and behavior which are extended through specific parts of the targeted radio access technology. This paper considers parameterizable modules of basic protocol functions residing in the data link layer of the ISO/OSI model. System-specific functionality of the protocol software is realized through adequate parameterization and composition of the generic modules. The generic protocol stack allows an efficient realization of reconfigurable protocol software and enables a completely reconfigurable wireless communication system. It is a first step from side-by-side realized, preinstalled modes in a terminal towards a dynamic reconfigurable anymode terminal. The presented modules of the generic protocol stack can also be regarded as a toolbox for the accelerated and cost-efficient development of future communication protocols.

  15. Smart sensors enable smart air conditioning control.

    Science.gov (United States)

    Cheng, Chin-Chi; Lee, Dasheng

    2014-06-24

    In this study, mobile phones, wearable devices, temperature and human motion detectors are integrated as smart sensors for enabling smart air conditioning control. Smart sensors obtain feedback, especially occupants' information, from mobile phones and wearable devices placed on human body. The information can be used to adjust air conditioners in advance according to humans' intentions, in so-called intention causing control. Experimental results show that the indoor temperature can be controlled accurately with errors of less than ±0.1 °C. Rapid cool down can be achieved within 2 min to the optimized indoor capacity after occupants enter a room. It's also noted that within two-hour operation the total compressor output of the smart air conditioner is 48.4% less than that of the one using On-Off control. The smart air conditioner with wearable devices could detect the human temperature and activity during sleep to determine the sleeping state and adjusting the sleeping function flexibly. The sleeping function optimized by the smart air conditioner with wearable devices could reduce the energy consumption up to 46.9% and keep the human health. The presented smart air conditioner could provide a comfortable environment and achieve the goals of energy conservation and environmental protection.

  16. Smart Sensors Enable Smart Air Conditioning Control

    Directory of Open Access Journals (Sweden)

    Chin-Chi Cheng

    2014-06-01

    Full Text Available In this study, mobile phones, wearable devices, temperature and human motion detectors are integrated as smart sensors for enabling smart air conditioning control. Smart sensors obtain feedback, especially occupants’ information, from mobile phones and wearable devices placed on human body. The information can be used to adjust air conditioners in advance according to humans’ intentions, in so-called intention causing control. Experimental results show that the indoor temperature can be controlled accurately with errors of less than ±0.1 °C. Rapid cool down can be achieved within 2 min to the optimized indoor capacity after occupants enter a room. It’s also noted that within two-hour operation the total compressor output of the smart air conditioner is 48.4% less than that of the one using On-Off control. The smart air conditioner with wearable devices could detect the human temperature and activity during sleep to determine the sleeping state and adjusting the sleeping function flexibly. The sleeping function optimized by the smart air conditioner with wearable devices could reduce the energy consumption up to 46.9% and keep the human health. The presented smart air conditioner could provide a comfortable environment and achieve the goals of energy conservation and environmental protection.

  17. Enabling technologies for autonomous MAV operations

    Science.gov (United States)

    Elbanhawi, M.; Mohamed, A.; Clothier, R.; Palmer, J. L.; Simic, M.; Watkins, S.

    2017-05-01

    The utility of micro air vehicles (MAVs) has expanded significantly in the last decade, and there are now numerous commercial systems available at relatively low cost. This expansion has arisen mainly due to the miniaturisation of flight control systems and advances in energy storage and propulsion technologies. Several emerging applications involve routine operation of MAVs in complex urban environments such as parcel delivery, communications relay and environmental monitoring. However, MAVs currently rely on one or more operators-in-the-loop and, whilst desirable, full autonomous operation has not yet been achieved. In this review paper, autonomous MAV operation in complex environments is explored with conceptualisation for future MAV operation in urban environments. Limitations of current technologies are systematically examined through consideration of the state-of-the-art and future trends. The main limitations challenging the realisation of fully autonomous MAVs are mainly attributed to: computational power, communication and energy storage. These limitations lead to poor sensing and planning capabilities, which are essential components of autonomous MAVs. Possible solutions are explored with goal of enabling MAVs to reliably operate autonomously in urban environments.

  18. Enabling Process Alignment for IT Entrepreneurship

    Directory of Open Access Journals (Sweden)

    Sonia D. Bot

    2012-11-01

    Full Text Available All firms use information technology (IT. Larger firms have IT organizations whose business function is to supply and manage IT infrastructure and applications to support the firm's business objectives. Regardless of whether the IT function has been outsourced or is resident within a firm, the objectives of the IT organization must be aligned to the strategic needs of the business. It is often a challenge to balance the demand for IT against the available supply within the firm. Most IT organizations have little capacity to carry out activities that go beyond the incremental ones that are needed to run the immediate needs of the business. A process-ambidexterity framework for IT improves the IT organization's entrepreneurial ability, which in turn, better aligns the IT function with the business functions in the firm. Process ambidexterity utilizes both process alignment and process adaptability. This article presents a framework for process alignment in IT. This is useful for understanding how the processes in Business Demand Management, a core component of the process-ambidexterity framework for IT, relate to those in IT Governance and IT Supply Chain Management. The framework is presented through three lenses (governance, business, and technology along with real-world examples from major firms in the USA. Enabling process alignment in the IT function, and process ambidexterity overall, benefits those who govern IT, the executives who lead IT, as well as their peers in the business functions that depend on IT.

  19. Enabling students to make investigations through spreadsheets

    Directory of Open Access Journals (Sweden)

    Erol - KARAKIRIK

    2015-01-01

    Full Text Available Spreadsheets are widely used in education to save time and simulate many scenarios in many different disciplines. However, they are not usually employed to provide rich interactions in the class although they provide huge computational powers and relate data in different places. It is argued in this paper that spreadsheets could also be used as an empowering tool for making inferences in the class by enabling students to investigate an open-ended problem, to make discussions about the problem and to share their results by turning a spreadsheet into an empowering tool. Constructivist approach requires students make conjectures and test them through cognitive tools provided such as Dynamic geometry environments. User could be required to investigate an open-ended problem by the help of available macros or templates provided by the instructor in a spreadsheet. It not only motivates the user to participate in the class but also make them think about the problem at hand. Our approach is exemplified through macros prepared for a math class and divisibility features of binomial coefficients were investigated through spreadsheets in this paper.

  20. Nanomaterial-enabled membranes for water treatment

    Science.gov (United States)

    Rogensues, Adam Roy

    Incorporating engineered nanomaterials as components of synthetic membranes can improve their separation performance and endow membranes with additional functions. This work explores two approaches to the design of membranes modified with nanomaterials. In the first chapter, exfoliated graphite nanoplatelets (xGnP) decorated with gold nanoparticles were embedded in a polysulfone matrix to fabricate phase inversion nanocomposite membranes. The cast membranes were evaluated as flow-through membrane reactors in experiments on the catalytic reduction of 4-nitrophenol. The nanocomposite membranes were not as catalytically efficient as those fabricated by modifying anodized alumina membranes polyelectrolyte multilayers (PEMs) containing gold nanoparticles. However, because of the facility of membrane casting by phase inversion and new opportunities enabled by the demonstrated hierarchy-based approach to nanocomposite membrane design, such membrane may hold commercial promise. In the second part of the study, the practicability of PEM-based nanofiltration was evaluated under conditions of precipitative fouling (i.e. scaling) by calcium sulfate. Polyelectrolytes were deposited onto 50 kDa polyethersulfone membranes to create PEM-based nanofiltration membranes. The prepared membranes were compared with the commercial NF270 membrane in terms of flux and rejection performance, as well as the morphology of gypsum crystals formed on the membrane surface. None of the PEM coatings tested inhibited scale formation.

  1. Enabler for the agile virtual enterprise

    Science.gov (United States)

    Fuerst, Karl; Schmidt, Thomas; Wippel, Gerald

    2001-10-01

    In this presentation, a new approach for a flexible low-cost Internet extended enterprise (project FLoCI-EE) will be presented. FLoCI-EE is a project in the fifth framework program of the European commission with 8 partners from 4 countries, which started in January 2001 and will be finished in December 2003. The main objective of FLoCI-EE is the development of a software prototype, which enables flexible enterprise cooperation with the aim to design, manufacture and sell products commonly, independent of enterprise borderlines. The needed IT-support includes functions of product data management (PDM), enterprise resource planning (ERP), supply chain management (SCM) and customer relationship management (CRM). Especially for small and medium sized enterprises, existing solutions are too expensive and inflexible to be of use under current turbulent market conditions. The second part of this paper covers the item Web Services, because in the role-specific support approach of FLoCI-EE, there are user- interface-components, which are tailored for specific roles in an enterprise. These components integrate automatically the services of the so-called basic-components, and the externally offered Web Services like UDDI.

  2. Syllable frequency and word frequency effects in spoken and written word production in a non-alphabetic script

    Directory of Open Access Journals (Sweden)

    Qingfang eZhang

    2014-02-01

    Full Text Available The effects of word frequency and syllable frequency are well-established phenomena in domain such as spoken production in alphabetic languages. Chinese, as a non-alphabetic language, presents unique lexical and phonological properties in speech production. For example, the proximate unit of phonological encoding is syllable in Chinese but segments in Dutch, French or English. The present study investigated the effects of word frequency and syllable frequency, and their interaction in Chinese written and spoken production. Significant facilitatory word frequency and syllable frequency effects were observed in spoken as well as in written production. The syllable frequency effect in writing indicated that phonological properties (i.e., syllabic frequency constrain orthographic output via a lexical route, at least, in Chinese written production. However, the syllable frequency effect over repetitions was divergent in both modalities: it was significant in the former two repetitions in spoken whereas it was significant in the second repetition only in written. Due to the fragility of the syllable frequency effect in writing, we suggest that the phonological influence in handwritten production is not mandatory and universal, and it is modulated by experimental manipulations. This provides evidence for the orthographic autonomy hypothesis, rather than the phonological mediation hypothesis. The absence of an interaction between word frequency and syllable frequency showed that the syllable frequency effect is independent of the word frequency effect in spoken and written output modalities. The implications of these results on written production models are discussed.

  3. Reaching for the Horizon: Enabling 21st Century Antarctic Science

    Science.gov (United States)

    Rogan-Finnemore, M.; Kennicutt, M. C., II; Kim, Y.

    2015-12-01

    The Council of Managers of National Antarctic Programs' (COMNAP) Antarctic Roadmap Challenges(ARC) project translated the 80 highest priority Antarctic and Southern Ocean scientific questionsidentified by the community via the SCAR Antarctic Science Horizon Scan into the highest prioritytechnological, access, infrastructure and logistics needs to enable the necessary research to answer thequestions. A workshop assembled expert and experienced Antarctic scientists and National AntarcticProgram operators from around the globe to discern the highest priority technological needs includingthe current status of development and availability, where the technologies will be utilized in the Antarctic area, at what temporal scales and frequencies the technologies will be employed,and how broadly applicable the technologies are for answering the highest priority scientific questions.Secondly the logistics, access, and infrastructure requirements were defined that are necessary todeliver the science in terms of feasibility including cost and benefit as determined by expected scientific return on investment. Finally, based on consideration of the science objectives and the mix oftechnologies implications for configuring National Antarctic Program logistics capabilities andinfrastructure architecture over the next 20 years were determined. In particular those elements thatwere either of a complexity, requiring long term investments to achieve and/or having an associated cost that realistically can only (or best) be achieved by international coordination, planning and partnerships were identified. Major trends (changes) in logistics, access, and infrastructure requirements were identified that allow for long-term strategic alignment of international capabilities, resources and capacity. The outcomes of this project will be reported.

  4. Enabling High Efficiency Nanoplasmonics with Novel Nanoantenna Architectures

    Science.gov (United States)

    Cohen, Moshik; Shavit, Reuven; Zalevsky, Zeev

    2015-12-01

    Surface plasmon polaritons (SPPs) are propagating excitations that arise from coupling of light with collective electron oscillations. Characterized by high field intensity and nanometric dimensions, SPPs fashion rapid expansion of interest from fundamental and applicative perspectives. However, high metallic losses at optical frequencies still make nanoplasmonics impractical when high absolute efficiency is paramount, with major challenge is efficient plasmon generation in deep nanoscale. Here we introduce the Plantenna, the first reported nanodevice with the potential of addressing these limitations utilizing novel plasmonic architecture. The Plantenna has simple 2D structure, ultracompact dimensions and is fabricated on Silicon chip for future CMOS integration. We design the Plantenna to feed channel (20 nm × 20 nm) nanoplasmonic waveguides, achieving 52% coupling efficiency with Plantenna dimensions of λ3/17,000. We theoretically and experimentally show that the Plantenna enormously outperforms dipole couplers, achieving 28 dB higher efficiency with broad polarization diversity and huge local field enhancement. Our findings confirm the Plantenna as enabling device for high efficiency plasmonic technologies such as quantum nanoplasmonics, molecular strong coupling and plasmon nanolasers.

  5. High-Frequency Learning.

    Science.gov (United States)

    Hollenbeck, Michelle D.

    1997-01-01

    For the past five years, Andover, Kansas middle-schoolers in an amateur radio club and class have sent and received Morse code messages, assembled and soldered circuit boards, designed and built antenna systems, and used computer programs to analyze radio communications problems. A successful bond issue financed a ham shack enabling students to…

  6. UNIVERSAL AUTO-CALIBRATION FOR A RAPID BATTERY IMPEDANCE SPECTRUM MEASUREMENT DEVICE

    Energy Technology Data Exchange (ETDEWEB)

    Jon P. Christophersen; John L. Morrison; William H. Morrison

    2014-03-01

    Electrochemical impedance spectroscopy has been shown to be a valuable tool for diagnostics and prognostics of energy storage devices such as batteries and ultra-capacitors. Although measurements have been typically confined to laboratory environments, rapid impedance spectrum measurement techniques have been developed for on-line, embedded applications as well. The prototype hardware for the rapid technique has been validated using lithium-ion batteries, but issues with calibration had also been identified. A new, universal automatic calibration technique was developed to address the identified issues while also enabling a more simplified approach. A single, broad-frequency range is used to calibrate the system and then scaled to the actual range and conditions used when measuring a device under test. The range used for calibration must be broad relative to the expected measurement conditions for the scaling to be successful. Validation studies were performed by comparing the universal calibration approach with data acquired from targeted calibration ranges based on the expected range of performance for the device under test. First, a mid-level shunt range was used for calibration and used to measure devices with lower and higher impedance. Next, a high excitation current level was used for calibration, followed by measurements using lower currents. Finally, calibration was performed over a wide frequency range and used to measure test articles with a lower set of frequencies. In all cases, the universal calibration approach compared very well with results acquired following a targeted calibration. Additionally, the shunts used for the automated calibration technique were successfully characterized such that the rapid impedance measurements compare very well with laboratory-scale measurements. These data indicate that the universal approach can be successfully used for onboard rapid impedance spectra measurements for a broad set of test devices and range of

  7. Enabling a Scientific Cloud Marketplace: VGL (Invited)

    Science.gov (United States)

    Fraser, R.; Woodcock, R.; Wyborn, L. A.; Vote, J.; Rankine, T.; Cox, S. J.

    2013-12-01

    The Virtual Geophysics Laboratory (VGL) provides a flexible, web based environment where researchers can browse data and use a variety of scientific software packaged into tool kits that run in the Cloud. Both data and tool kits are published by multiple researchers and registered with the VGL infrastructure forming a data and application marketplace. The VGL provides the basic work flow of Discovery and Access to the disparate data sources and a Library for tool kits and scripting to drive the scientific codes. Computation is then performed on the Research or Commercial Clouds. Provenance information is collected throughout the work flow and can be published alongside the results allowing for experiment comparison and sharing with other researchers. VGL's "mix and match" approach to data, computational resources and scientific codes, enables a dynamic approach to scientific collaboration. VGL allows scientists to publish their specific contribution, be it data, code, compute or work flow, knowing the VGL framework will provide other components needed for a complete application. Other scientists can choose the pieces that suit them best to assemble an experiment. The coarse grain workflow of the VGL framework combined with the flexibility of the scripting library and computational toolkits allows for significant customisation and sharing amongst the community. The VGL utilises the cloud computational and storage resources from the Australian academic research cloud provided by the NeCTAR initiative and a large variety of data accessible from national and state agencies via the Spatial Information Services Stack (SISS - http://siss.auscope.org). VGL v1.2 screenshot - http://vgl.auscope.org

  8. Integrated and Intelligent Manufacturing: Perspectives and Enablers

    Directory of Open Access Journals (Sweden)

    Yubao Chen

    2017-10-01

    Full Text Available With ever-increasing market competition and advances in technology, more and more countries are prioritizing advanced manufacturing technology as their top priority for economic growth. Germany announced the Industry 4.0 strategy in 2013. The US government launched the Advanced Manufacturing Partnership (AMP in 2011 and the National Network for Manufacturing Innovation (NNMI in 2014. Most recently, the Manufacturing USA initiative was officially rolled out to further “leverage existing resources... to nurture manufacturing innovation and accelerate commercialization” by fostering close collaboration between industry, academia, and government partners. In 2015, the Chinese government officially published a 10-year plan and roadmap toward manufacturing: Made in China 2025. In all these national initiatives, the core technology development and implementation is in the area of advanced manufacturing systems. A new manufacturing paradigm is emerging, which can be characterized by two unique features: integrated manufacturing and intelligent manufacturing. This trend is in line with the progress of industrial revolutions, in which higher efficiency in production systems is being continuously pursued. To this end, 10 major technologies can be identified for the new manufacturing paradigm. This paper describes the rationales and needs for integrated and intelligent manufacturing (i2M systems. Related technologies from different fields are also described. In particular, key technological enablers, such as the Internet of Things and Services (IoTS, cyber-physical systems (CPSs, and cloud computing are discussed. Challenges are addressed with applications that are based on commercially available platforms such as General Electric (GE’s Predix and PTC’s ThingWorx.

  9. "Nanotechnology Enabled Advanced Industrial Heat Transfer Fluids"

    Energy Technology Data Exchange (ETDEWEB)

    Dr. Ganesh Skandan; Dr. Amit Singhal; Mr. Kenneth Eberts; Mr. Damian Sobrevilla; Prof. Jerry Shan; Stephen Tse; Toby Rossmann

    2008-06-12

    ABSTRACT Nanotechnology Enabled Advanced industrial Heat Transfer Fluids” Improving the efficiency of Industrial Heat Exchangers offers a great opportunity to improve overall process efficiencies in diverse industries such as pharmaceutical, materials manufacturing and food processing. The higher efficiencies can come in part from improved heat transfer during both cooling and heating of the material being processed. Additionally, there is great interest in enhancing the performance and reducing the weight of heat exchangers used in automotives in order to increase fuel efficiency. The goal of the Phase I program was to develop nanoparticle containing heat transfer fluids (e.g., antifreeze, water, silicone and hydrocarbon-based oils) that are used in transportation and in the chemical industry for heating, cooling and recovering waste heat. Much work has been done to date at investigating the potential use of nanoparticle-enhanced thermal fluids to improve heat transfer in heat exchangers. In most cases the effect in a commercial heat transfer fluid has been marginal at best. In the Phase I work, we demonstrated that the thermal conductivity, and hence heat transfer, of a fluid containing nanoparticles can be dramatically increased when subjected to an external influence. The increase in thermal conductivity was significantly larger than what is predicted by commonly used thermal models for two-phase materials. Additionally, the surface of the nanoparticles was engineered so as to have a minimal influence on the viscosity of the fluid. As a result, a nanoparticle-laden fluid was successfully developed that can lead to enhanced heat transfer in both industrial and automotive heat exchangers

  10. Cusps enable line attractors for neural computation

    Science.gov (United States)

    Xiao, Zhuocheng; Zhang, Jiwei; Sornborger, Andrew T.; Tao, Louis

    2017-11-01

    Line attractors in neuronal networks have been suggested to be the basis of many brain functions, such as working memory, oculomotor control, head movement, locomotion, and sensory processing. In this paper, we make the connection between line attractors and pulse gating in feed-forward neuronal networks. In this context, because of their neutral stability along a one-dimensional manifold, line attractors are associated with a time-translational invariance that allows graded information to be propagated from one neuronal population to the next. To understand how pulse-gating manifests itself in a high-dimensional, nonlinear, feedforward integrate-and-fire network, we use a Fokker-Planck approach to analyze system dynamics. We make a connection between pulse-gated propagation in the Fokker-Planck and population-averaged mean-field (firing rate) models, and then identify an approximate line attractor in state space as the essential structure underlying graded information propagation. An analysis of the line attractor shows that it consists of three fixed points: a central saddle with an unstable manifold along the line and stable manifolds orthogonal to the line, which is surrounded on either side by stable fixed points. Along the manifold defined by the fixed points, slow dynamics give rise to a ghost. We show that this line attractor arises at a cusp catastrophe, where a fold bifurcation develops as a function of synaptic noise; and that the ghost dynamics near the fold of the cusp underly the robustness of the line attractor. Understanding the dynamical aspects of this cusp catastrophe allows us to show how line attractors can persist in biologically realistic neuronal networks and how the interplay of pulse gating, synaptic coupling, and neuronal stochasticity can be used to enable attracting one-dimensional manifolds and, thus, dynamically control the processing of graded information.

  11. Hopping models and ac universality

    DEFF Research Database (Denmark)

    Dyre, Jeppe; Schrøder, Thomas

    2002-01-01

    Some general relations for hopping models are established. We proceed to discuss the universality of the ac conductivity which arises in the extreme disorder limit of the random barrier model. It is shown that the relevant dimension entering into the diffusion cluster approximation (DCA) is the h......Some general relations for hopping models are established. We proceed to discuss the universality of the ac conductivity which arises in the extreme disorder limit of the random barrier model. It is shown that the relevant dimension entering into the diffusion cluster approximation (DCA......) is the harmonic (fracton) dimension of the diffusion cluster. The temperature scaling of the dimensionless frequency entering into the DCA is discussed. Finally, some open problems regarding ac universality are listed....

  12. A generalized strategy for designing (19)F/(1)H dual-frequency MRI coil for small animal imaging at 4.7 Tesla.

    Science.gov (United States)

    Hu, Lingzhi; Hockett, Frank D; Chen, Junjie; Zhang, Lei; Caruthers, Shelton D; Lanza, Gregory M; Wickline, Samuel A

    2011-07-01

    To propose and test a universal strategy for building (19) F/(1) H dual-frequency RF coil that permits multiple coil geometries. The feasibility to design (19) F/(1) H dual-frequency RF coil based on coupled resonator model was investigated. A series capacitive matching network enables robust impedance matching for both harmonic oscillating modes of the coupled resonator. Two typical designs of (19) F/(1) H volume coils (birdcage and saddle) at 4.7T were implemented and evaluated with electrical bench test and in vivo (19) F/(1) H dual-nuclei imaging. For various combinations of internal resistances of the sample coil and secondary resonator, numerical solutions for the tunable capacitors to optimize impedance matching were obtained using a root-seeking program. Identical and homogeneous B1 field distribution at (19) F and (1) H frequencies were observed in bench test and phantom image. Finally, in vivo mouse imaging confirmed the sensitivity and homogeneity of the (19) F/(1) H dual-frequency coil design. A generalized strategy for designing (19) F/(1) H dual-frequency coils based on the coupled resonator approach was developed and validated. A unique feature of this design is that it preserves the B1 field homogeneity of the RF coil at both resonant frequencies. Thus it minimizes the susceptibility effect on image co-registration. Copyright © 2011 Wiley-Liss, Inc.

  13. Recruiting Diverse Students and Enabling Them to Succeed in STEM

    Science.gov (United States)

    Tremmel, Michael J.; Pre-Major in Astronomy Program

    2015-01-01

    Improving the diversity within the rapidly growing fields of science, technology, engineering, and mathematics (STEM) has become a forefront issue facing collegiate departments today. It is well known that there are large gaps in the participation and performance of minorities, women, and low-income students within these fields and that special attention must be paid in order to close this gap. Since 2005, the Pre-Major in Astronomy Program (Pre-MAP) at the University of Washington (UW) Department of Astronomy has made a concentrated effort to recruit and retain underrepresented undergraduates in STEM, at which it has been very successful. Of course, recruiting these students can be a challenge, as is creating a curriculum and atmosphere that enables undergraduates to successfully participate in real astronomy research during their first or second year at a four-year college. Pre-MAP recruits a significant population of minorities and women into the program. The structure of the seminar is intended to not only provide necessary skills and experience, but also create a collaborative and supportive atmosphere among each cohort. I will discuss the recruitment practices of Pre-MAP as well as the structure of the seminar and how it addresses the goal of early participation and success in STEM research and course work.The intent of this talk is to share our methods so that more programs like Pre-MAP can be adopted successfully in other institutions.

  14. International organizations to enable world-wide mobile satellite services

    Science.gov (United States)

    Anglin, Richard L., Jr.

    1993-01-01

    Numbers of systems exist or have been proposed to provide world-wide mobile satellite services (MSS). Developers of these systems have formulated institutional structures they consider most appropriate for profitable delivery of these services. MSS systems provide niche services and complement traditional telecommunications networks; they are not integrated into world-wide networks. To be successful, MSS system operators must be able to provide an integrated suite of services to support the increasing globalization, interconnectivity, and mobility of business. The critical issue to enabling 'universal roaming' is securing authority to provide MSS in all of the nations of the world. Such authority must be secured in the context of evolving trends in international telecommunications, and must specifically address issues of standardization, regulation and organization. Today, only one existing organization has such world-wide authority. The question is how proponents of new MSS systems and services can gain similar authority. Securing the appropriate authorizations requires that these new organizations reflect the objectives of the nations in which services are to be delivered.

  15. Fast fundamental frequency estimation

    DEFF Research Database (Denmark)

    Nielsen, Jesper Kjær; Jensen, Tobias Lindstrøm; Jensen, Jesper Rindom

    2017-01-01

    Modelling signals as being periodic is common in many applications. Such periodic signals can be represented by a weighted sum of sinusoids with frequencies being an integer multiple of the fundamental frequency. Due to its widespread use, numerous methods have been proposed to estimate the funda......Modelling signals as being periodic is common in many applications. Such periodic signals can be represented by a weighted sum of sinusoids with frequencies being an integer multiple of the fundamental frequency. Due to its widespread use, numerous methods have been proposed to estimate...... the fundamental frequency, and the maximum likelihood (ML) estimator is the most accurate estimator in statistical terms. When the noise is assumed to be white and Gaussian, the ML estimator is identical to the non-linear least squares (NLS) estimator. Despite being optimal in a statistical sense, the NLS...... estimator has a high computational complexity. In this paper, we propose an algorithm for lowering this complexity significantly by showing that the NLS estimator can be computed efficiently by solving two Toeplitz-plus-Hankel systems of equations and by exploiting the recursive-in-order matrix structures...

  16. [Frequency of epidural analgesia for vaginal delivery].

    Science.gov (United States)

    Atanassova, M; Nikolov, A

    2011-01-01

    To establish the frequency of epidural analgesia for vaginal delivery. The research includes 51 632 deliveries for 16 years period. Total frequency of vaginal delivery with EA, compared to total number of vaginal deliveries for period is 11.77%. The frequency shows tendency to slowly increase in the beginning of the period, probably because of getting experienced among some of the obstetricians, after then frequency stay relatively constant. Except care of somatic health of mother and foetus, modern obstetrics requires to ensure maximum comfort of parturient, to satisfy requirements of modern women for "painless" delivery and leave a positive memory of birth. That is why more frequently use of EA for vaginal delivery is necessary. EA is an approved method for anesthetizing vaginal delivery. It is established slowly increasing frequency of EA for anesthetizing vaginal delivery. The frequency of EA in University hospital "Maichin dom" is relatively low in comparison with mentioned in literature values, which raises the question of finding ways to further promote and increase the application of EA.

  17. The UCAR Africa Initiative: Enabling African Solutions to African Needs

    Science.gov (United States)

    Pandya, R.; Bruintjes, R.; Foote, B.; Heck, S.; Hermann, S.; Hoswell, L.; Konate, M.; Kucera, P.; Laing, A.; Lamptey, B.; Moncrieff, M.; Ramamurthy, M.; Roberts, R.; Spangler, T.; Traoré, A.; Yoksas, T.; Warner, T.

    2007-12-01

    The University Corporation for Atmospheric Research (UCAR) Africa Initiative (AI) is a coordinated effort aimed at building sustainable partnerships between UCAR and African institutions in order to pursue research and applications for the benefit of the African people. The initiative is based on four fundamental operating principles, concisely summarized by the overall philosophy of enabling African solutions to African needs. The four principles are: • Collaborate with African institutions • Focus on institutional capacity building and research support • Explore science research themes critical to Africa and important for the world • Leverage the research infrastructure in UCAR to add value These principles are realized in a set of pilot activities, chosen for their high probability of short-term results and ability to set the stage for longer-term collaboration. The three pilot activities are listed below. 1. A modest radar network and data-distribution system in Mali and Burkina Faso, including a data-sharing MOU between the Mail and Burkina Faso Weather Services. 2. A partnership among UCAR, the Ghana Meteorological Agency, and the Ghana university community to develop an operational Weather Research and Forecasting (WRF) model for West Africa. The output is used by researchers and operational forecasters in Africa. Model output is also part of a demonstration project that aims to allow humanitarian agencies to share geo-referenced information in Africa via a web portal. 3. A workshop in Ouagadougou, Burkina Faso from April 2-6, 2007, with the theme Improving Lives by Understanding Weather. The workshop, co-organized with Programme SAAGA and the Commité Permanent Inter-Etats de Lutte Contre la Sécheresse dans le Sahel (CILSS), included over 80 participants from 18 countries, and produced a set of recommendations for continued collaboration. Our presentation will provide an update of these pilot activities and point to future directions. Recognizing

  18. Enabling technologies for the prassi autonomous robot

    Energy Technology Data Exchange (ETDEWEB)

    Taraglio, S.; Nanni, V. [ENEA, Robotics and Information Technology Division, Rome (Italy)

    2001-07-01

    In this book are summarised some of the results of the PRASSI project as presented by the different partners of the effort. PRASSI is an acronym which stands for Autonomous Robotic Platform for the Security and Surveillance of plants, the Italian for it is 'Piattaforma Robotica per la Sorveglianza e Sicurezza d'Impianto'. This project has been funded by the Italian Ministry for the Education, the University and the Research (MIUR) in the framework of the project High Performance Computing Applied to Robotics (Calcolo Parallelo con Applicazioni alla Robotica) of the law 95/1995. The idea behind such an initiative is that of fostering the knowledge and possibly the use of high performance computing in the research and industrial community. In other words, robotic scientists are always simplifying their algorithms or using particular approaches (e.g. soft computing) in order to use standard processors for difficult sensorial data processing; well, what if an embedded parallel computer were available, with at least one magnitude more of computing power?.

  19. Characteristics of Radio-Frequency Circuits Utilizing Ferroelectric Capacitors

    Science.gov (United States)

    Eskridge, Michael; Gui, Xiao; MacLeod, Todd; Ho, Fat D.

    2011-01-01

    Ferroelectric capacitors, most commonly used in memory circuits and variable components, were studied in simple analog radio-frequency circuits such as the RLC resonator and Colpitts oscillator. The goal was to characterize the RF circuits in terms of frequency of oscillation, gain, etc, using ferroelectric capacitors. Frequencies of oscillation of both circuits were measured and studied a more accurate resonant frequency can be obtained using the ferroelectric capacitors. Many experiments were conducted and data collected. A model to simulate the experimental results will be developed. Discrepancies in gain and frequency in these RF circuits when conventional capacitors are replaced with ferroelectric ones were studied. These results will enable circuit designers to anticipate the effects of using ferroelectric components in their radio- frequency applications.

  20. Frequency Standards and Metrology

    Science.gov (United States)

    Maleki, Lute

    2009-04-01

    Preface / Lute Maleki -- Symposium history / Jacques Vanier -- Symposium photos -- pt. I. Fundamental physics. Variation of fundamental constants from the big bang to atomic clocks: theory and observations (Invited) / V. V. Flambaum and J. C. Berengut. Alpha-dot or not: comparison of two single atom optical clocks (Invited) / T. Rosenband ... [et al.]. Variation of the fine-structure constant and laser cooling of atomic dysprosium (Invited) / N. A. Leefer ... [et al.]. Measurement of short range forces using cold atoms (Invited) / F. Pereira Dos Santos ... [et al.]. Atom interferometry experiments in fundamental physics (Invited) / S. W. Chiow ... [et al.]. Space science applications of frequency standards and metrology (Invited) / M. Tinto -- pt. II. Frequency & metrology. Quantum metrology with lattice-confined ultracold Sr atoms (Invited) / A. D. Ludlow ... [et al.]. LNE-SYRTE clock ensemble: new [symbol]Rb hyperfine frequency measurement - spectroscopy of [symbol]Hg optical clock transition (Invited) / M. Petersen ... [et al.]. Precise measurements of S-wave scattering phase shifts with a juggling atomic clock (Invited) / S. Gensemer ... [et al.]. Absolute frequency measurement of the [symbol] clock transition (Invited) / M. Chwalla ... [et al.]. The semiclassical stochastic-field/atom interaction problem (Invited) / J. Camparo. Phase and frequency noise metrology (Invited) / E. Rubiola ... [et al.]. Optical spectroscopy of atomic hydrogen for an improved determination of the Rydberg constant / J. L. Flowers ... [et al.] -- pt. III. Clock applications in space. Recent progress on the ACES mission (Invited) / L. Cacciapuoti and C. Salomon. The SAGAS mission (Invited) / P. Wolf. Small mercury microwave ion clock for navigation and radioScience (Invited) / J. D. Prestage ... [et al.]. Astro-comb: revolutionizing precision spectroscopy in astrophysics (Invited) / C. E. Kramer ... [et al.]. High frequency very long baseline interferometry: frequency standards and

  1. Estimativa da porcentagem de biodisponibilidade e frequência de ferro nos cardápios do restaurante de um Hospital Universitário = Estimate of the percentage of bioavailability and frequency of iron in the menu of a University Hospital restaurant

    Directory of Open Access Journals (Sweden)

    Jailane de Souza Aquino

    2009-01-01

    Full Text Available O objetivo do presente estudo foi calcular a biodisponibilidade de ferro e avaliar a frequência deste mineral nos cardápios do restaurante de um Hospital Universitário. Um algoritmo foi utilizado para cálculo da porcentagem de ferro biodisponível em quatrocardápios. O cardápio nº 2 apresentou a maior frequência de ferro; o nº 3, a menor. A maior média de ferro ingerido foi a evidenciada no cardápio 2, com 19,93 mg de ferro, porém a maior biodisponibilidade foi encontrada no cardápio 3, com 1,79 mg de ferro. Tanto aquantidade de ferro ingerida quanto a biodisponível destes cardápios não apresentaram diferença significativa (p > 0,05, no entanto suas médias absolutas de biodisponibilidade foram influenciadas com maior intensidade pela presença de ácido ascórbico e tecidos animais,e menos pelas gorduras. As refeições apresentaram biodisponibilidade intermediária e os cardápios mostraram-se inadequados, em sua maioria, para gestantes. Pode-se observar que nem sempre a maior frequência de ferro resultará em maior ingestão e em maior absorção,pois tudo isso depende de sua biodisponibilidade na refeição.The purpose of this study was to calculate the bioavailability of iron and evaluate the frequency of that mineral in the menus of the restaurant of a university hospital. An algorithm was used to calculate the percentage of iron bioavailability in four meals. Institutional meal no. 2 presented the highest frequency of iron, whereas no. 3 presented the lowest. The highest average of ingested iron was evidenced in meal no. 2, with 19.93 mg of iron; however, the largest bioavailability was found in menu no. 3, with 1.79 mg of iron. The amount of iron ingested and the bioavailable amount in these menus did not present significant difference (p > 0.05, however, their absolute bioavailability averages were influenced with larger intensity by the presence of ascorbic acid and animal tissues, and less so by fats. The meals

  2. A Frequency-Depth Explicit Interaction Theory Formulation

    DEFF Research Database (Denmark)

    Ruiz, Pau Mercadé; Ferri, Francesco; Kofoed, Jens Peter

    2016-01-01

    An alternative definition of the usual diffraction transfer matrix defined by Kagemoto and Yue (1986) has been developed. A method is thereby presented which enables the prediction of the diffraction transfer matrix for any desired wave frequency and water depth. The method has been tested...... been shown for the case of a fixed water depth condition and predicting for different wave frequencies. Furthermore, the investigations have shown promising results when only accounting for travelling wave modes....

  3. Post qualifying specialist awards: approaches to enabling work-based learning in social work

    OpenAIRE

    Rutter, Lynne; Williams, Sarah

    2008-01-01

    All post-qualifying social work specialist awards are required to include ‘enabling the learning of others’, so that specialist social workers can provide basic support to learners in the workplace (GSCC 2006). This paper reports on a new programme unit we have designed at Bournemouth University.\\ud \\ud Our overall approach encompasses the necessary competences, but also provides for a more holistic and flexible outcome – capability. We follow the ideas of authors such as Lester (1995), Fook ...

  4. Superconductors Enable Lower Cost MRI Systems

    Science.gov (United States)

    2013-01-01

    The future looks bright, light, and green, especially where aircraft are concerned. The division of NASA s Fundamental Aeronautics Program called the Subsonic Fixed Wing Project is aiming to reach new heights by 2025-2035, improving the efficiency and environmental impact of air travel by developing new capabilities for cleaner, quieter, and more fuel efficient aircraft. One of the many ways NASA plans to reach its aviation goals is by combining new aircraft configurations with an advanced turboelectric distributed propulsion (TeDP) system. Jeff Trudell, an engineer at Glenn Research Center, says, "The TeDP system consists of gas turbines generating electricity to power a large number of distributed motor-driven fans embedded into the airframe." The combined effect increases the effective bypass ratio and reduces drag to meet future goals. "While room temperature components may help reduce emissions and noise in a TeDP system, cryogenic superconducting electric motors and generators are essential to reduce fuel burn," says Trudell. Superconductors provide significantly higher current densities and smaller and lighter designs than room temperature equivalents. Superconductors are also able to conduct direct current without resistance (loss of energy) below a critical temperature and applied field. Unfortunately, alternating current (AC) losses represent the major part of the heat load and depend on the frequency of the current and applied field. A refrigeration system is necessary to remove the losses and its weight increases with decreasing temperature. In 2001, a material called magnesium diboride (MgB2) was discovered to be superconducting. The challenge, however, has been learning to manufacture MgB2 inexpensively and in long lengths to wind into large coils while meeting the application requirements.

  5. Bioblendstocks that Enable High Efficiency Engine Designs

    Energy Technology Data Exchange (ETDEWEB)

    McCormick, Robert L.; Fioroni, Gina M.; Ratcliff, Matthew A.; Zigler, Bradley T.; Farrell, John

    2016-11-03

    The past decade has seen a high level of innovation in production of biofuels from sugar, lipid, and lignocellulose feedstocks. As discussed in several talks at this workshop, ethanol blends in the E25 to E50 range could enable more highly efficient spark-ignited (SI) engines. This is because of their knock resistance properties that include not only high research octane number (RON), but also charge cooling from high heat of vaporization, and high flame speed. Emerging alcohol fuels such as isobutanol or mixed alcohols have desirable properties such as reduced gasoline blend vapor pressure, but also have lower RON than ethanol. These fuels may be able to achieve the same knock resistance benefits, but likely will require higher blend levels or higher RON hydrocarbon blendstocks. A group of very high RON (>150) oxygenates such as dimethyl furan, methyl anisole, and related compounds are also produced from biomass. While providing no increase in charge cooling, their very high octane numbers may provide adequate knock resistance for future highly efficient SI engines. Given this range of options for highly knock resistant fuels there appears to be a critical need for a fuel knock resistance metric that includes effects of octane number, heat of vaporization, and potentially flame speed. Emerging diesel fuels include highly branched long-chain alkanes from hydroprocessing of fats and oils, as well as sugar-derived terpenoids. These have relatively high cetane number (CN), which may have some benefits in designing more efficient CI engines. Fast pyrolysis of biomass can produce diesel boiling range streams that are high in aromatic, oxygen and acid contents. Hydroprocessing can be applied to remove oxygen and consequently reduce acidity, however there are strong economic incentives to leave up to 2 wt% oxygen in the product. This oxygen will primarily be present as low CN alkyl phenols and aryl ethers. While these have high heating value, their presence in diesel fuel

  6. Hydrologic Prediction Through Earthcube Enabled Hydrogeophysical Cyberinfrastructure

    Science.gov (United States)

    Versteeg, R. J.; Johnson, D.

    2012-12-01

    to "develop a framework to understand and predict responses of the Earth as a system— from the space-atmosphere boundary to the core, including the influences of humans and ecosystems." Effective development of hydrologic prediction tools will require the hydrogeophysical community to engage in and become conversant with the cyberinfrastructure community. In my presentation I will provide several examples of how such tools could look like, and what some of the opportunities are for getting this engagement going and develop cyberinfrastructure enabled hydrologic prediction tools.

  7. ULEO - Universal Linking of engineering objects

    NARCIS (Netherlands)

    Zimmermann, J.U.; Zimmerman, J.U.; Haasis, S.; van Houten, Frederikus J.A.M.

    2002-01-01

    This paper reports on ongoing research in the field of feature-based product development. The resulting ULEO approach aims at enabling a high-quality flow of information between applications and at universal automation of product model generation. This is achieved by modeling all classes of relevant

  8. Exploring the HI Universe with ASKAP

    NARCIS (Netherlands)

    Meyer, Martin

    2009-01-01

    The survey speed of ASKAP makes it a prime instrument with which to survey the HI universe, enabling it to carry out both wide surveys of the entire sky, as well as deep surveys covering cosmologically representative volumes. Here, the use of ASKAP to study deep HI fields is discussed as proposed by

  9. University-School Partnerships: An Organizational Evaluation.

    Science.gov (United States)

    Jones, Richard V.

    Sixteen goal-like statements were developed around P. Reed's contention that university-public school partnerships promote interdependence between groups, a balanced exchange of valued commodities, shared decision making, adaptations to inherent barriers, and an enabling support structure. The questionnaire was pilot tested with members of other…

  10. Exploring the role of leadership in enabling contextual ambidexterity

    NARCIS (Netherlands)

    Havermans, L.A.; Den Hartog, D.N.; Keegan, A.E.; Uhl-Bien, M.

    2015-01-01

    Sustainable success calls for contextually ambidextrous organizing. According to theory, this entails enabling simultaneous high levels of exploration and exploitation within a subsystem. The practices involved in enabling contextual ambidexterity form a major and relatively unexplored leadership

  11. Enabling performance measurement in a small professional service firm

    NARCIS (Netherlands)

    Groen, B.A.C.; van de Belt, M.; Wilderom, C.P.M.

    2012-01-01

    Purpose - Showing why developing an enabling PMS can be useful to small PSFs and how small PSFs can develop such an enabling PMS. Design/methodology/approach - We used a process-consultation type of action research design. We developed an enabling PMS in close cooperation with the employees of a

  12. The Free Universal Construction Kit

    DEFF Research Database (Denmark)

    Stephensen, Jan Løhmann; Hansen, Lone Koefoed

    2013-01-01

    With the increasing economic accessibility of 3D printers, the lessons learned and the logics cultivated on digital Web 2.0 now seems applicable to the world of material things. Released in early 2012 by the artist groups F.A.T. and Sy-lab, the Free Universal Construction Kit is a set of 3D...... drawings that enable everyone with access to a 3D printer to make connectors, “the missing links”, between intellectual property restricted toys like LEGO, Tinkertoys, and Fischertechnik. However, when describing this project as “reverse engineering as a civic activity”, it seems obvious that F...

  13. High frequency electromagnetic dosimetry

    CERN Document Server

    Sánchez-Hernández, David A

    2009-01-01

    Along with the growth of RF and microwave technology applications, there is a mounting concern about the possible adverse effects over human health from electromagnetic radiation. Addressing this issue and putting it into perspective, this groundbreaking resource provides critical details on the latest advances in high frequency electromagnetic dosimetry.

  14. Frequency scanning microstrip antennas

    DEFF Research Database (Denmark)

    Danielsen, Magnus; Jørgensen, Rolf

    1979-01-01

    The principles of using radiating microstrip resonators as elements in a frequency scanning antenna array are described. The resonators are cascade-coupled. This gives a scan of the main lobe due to the phase-shift in the resonator in addition to that created by the transmission line phase...

  15. Metamaterial for Radar Frequencies

    Science.gov (United States)

    2012-09-01

    capacitive coupling with adjacent patches, as shown in Figure 3. The via provides inductance to ground. Figure 3. (a) Planar LH distributed periodic...After [20]). The capacitance in the structure balances out the inductance present when the cylinder is placed in a square array. The metallic... RADAR FREQUENCIES by Szu Hau Tan September 2012 Thesis Advisor: David C. Jenn Second Reader: James Calusdian

  16. Frequency of orthodontic extraction

    Science.gov (United States)

    Dardengo, Camila de S.; Fernandes, Luciana Q. P.; Capelli, Jonas

    2016-01-01

    Introduction: The option of dental extraction for orthodontic purposes has been debated for more than 100 years, including periods when it was widely used in treatment, including the present, during which other methods are used to avoid dental extractions. The objective was to analyze the frequency of tooth extraction treatment performed between 1980 and 2011 at the Orthodontic Clinic of Universidade Estadual do Rio de Janeiro (UERJ). Material and Methods: The clinical records of 1484 patients undergoing orthodontic treatment were evaluated. The frequency of extractions was evaluated with regard to sex, Angle's classification, the different combinations of extractions and the period when orthodontic treatment began. Chi-square test was used to determine correlations between variables, while the chi-square test for trends was used to assess the frequency of extractions over the years. Results: There was a reduction of approximately 20% in the frequency of cases treated with tooth extraction over the last 32 years. The most frequently extracted teeth were first premolars. Patients with Class I malocclusion showed fewer extractions, while Class II patients underwent a higher number of extraction treatment. There were no statistically significant differences with regard to sex. Conclusion: New features introduced into the orthodontic clinic and new esthetic concepts contributed to reducing the number of cases treated with dental extractions. However, dental extractions for orthodontic purposes are still well indicated in certain cases. PMID:27007762

  17. Updating Labelling Theory: Normalizing but not Enabling

    Directory of Open Access Journals (Sweden)

    Thomas Scheff

    2017-04-01

    Full Text Available Normal 0 21 false false false NO-BOK X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Vanlig tabell"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} In modern societies we often make judgements of certain kinds of behaviour that are virtually automatic: delusions show that one is crazy, wrong answers show that one is ignorant, and so on. The theory of labelling/normalization suggests caution in making these judgements because of the effect they are likely to have on the social relationship, feelings of rejection and embarrassment. There is a social-emotional component in all human contact that can be managed independently of the content. Equal care is needed to avoid both labelling and enabling. Two extended and three brief concrete examples of normalizing are discussed. The social-emotional component seems to be critical in most relationships, both in psychotherapy and education, as suggested by the examples. Normal 0 21 false false false NO-BOK X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Vanlig tabell"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font

  18. Fusion-Enabled Pluto Orbiter and Lander

    Science.gov (United States)

    Thomas, Stephanie

    2017-01-01

    The Pluto orbiter mission proposed here is credible and exciting. The benefits to this and all outer-planet and interstellar-probe missions are difficult to overstate. The enabling technology, Direct Fusion Drive, is a unique fusion engine concept based on the Princeton Field-Reversed Configuration (PFRC) fusion reactor under development at the Princeton Plasma Physics Laboratory. The truly game-changing levels of thrust and power in a modestly sized package could integrate with our current launch infrastructure while radically expanding the science capability of these missions. During this Phase I effort, we made great strides in modeling the engine efficiency, thrust, and specific impulse and analyzing feasible trajectories. Based on 2D fluid modeling of the fusion reactors outer stratum, its scrape-off-layer (SOL), we estimate achieving 2.5 to 5 N of thrust for each megawatt of fusion power, reaching a specific impulse, Isp, of about 10,000 s. Supporting this model are particle-in-cell calculations of energy transfer from the fusion products to the SOL electrons. Subsequently, this energy is transferred to the ions as they expand through the magnetic nozzle and beyond. Our point solution for the Pluto mission now delivers 1000 kg of payload to Pluto orbit in 3.75 years using 7.5 N constant thrust. This could potentially be achieved with a single 1 MW engine. The departure spiral from Earth orbit and insertion spiral to Pluto orbit require only a small portion of the total delta-V. Departing from low Earth orbit reduces mission cost while increasing available mission mass. The payload includes a lander, which utilizes a standard green propellant engine for the landing sequence. The lander has about 4 square meters of solar panels mounted on a gimbal that allows it to track the orbiter, which beams 30 to 50 kW of power using a 1080 nm laser. Optical communication provides dramatically high data rates back to Earth. Our mass modeling investigations revealed that if

  19. Single snapshot multiple frequency modulated imaging of subsurface optical properties of turbid media with structured light

    OpenAIRE

    M. Xu; Zili Cao; Weihao Lin; Xinlin Chen; Longfei Zheng; Bixin Zeng

    2016-01-01

    We report a novel demodulation method that enables single snapshot wide field imaging of optical properties of turbid media in the Spatial Frequency Domain (SFD). This Single Snapshot Multiple frequency Demodulation (SSMD) method makes use of the orthogonality of harmonic functions to extract the modulation transfer function (MTF) at multiple modulation frequencies simultaneously from a single structured-illuminated image at once. The orientation, frequency, and amplitude of each modulation c...

  20. Frequency scanning interferometry for CLIC component fiducialisation

    CERN Document Server

    Kamugasa, Solomon William; Mainaud Durand, Helene; CERN. Geneva. ATS Department

    2016-01-01

    We present a strategy for the fiducialisation of CLIC’s Main Beam Quadrupole (MBQ) magnets using Frequency Scanning Interferometry (FSI). We have developed complementary device for a commercial FSI system to enable coordinate determination via multilateration. Using spherical high index glass retroreflectors with a wide acceptance angle, we optimise the geometry of measurement stations with respect to fiducials -- thus improving the precision of coordinates. We demonstrate through simulations that the 10 μm uncertainty required in the vertical and lateral axes for the fiducialisation of the MBQ can be attained using FSI multilateration.

  1. What fosters entrepreneurs at university colleges?

    DEFF Research Database (Denmark)

    Thomassen, Mette Lindahl

    entrepreneurship at university colleges be identified in order to solidify the entrepreneurial education? If cases where students have become entrepreneurs are studied, as a method to identify entrepreneurship supporting and enabling educational elements, a future research question is raised: “How do student......), it seems contradictory to use quantitative research methods to look for causal relations between educational elements and student entrepreneurs, therefore a qualitative approach is suggested. Implications: In order to answer all of the questions raised, further research is needed. Value...... of the following paper is to what extent the knowledge generated at the universities can be transferred directly to a university college context? The second question raised is centered on the “what” of entrepreneurship education relating to content: How can educational elements that enable and promote...

  2. What fosters entrepreneurs at university colleges?

    DEFF Research Database (Denmark)

    Thomassen, Mette Lindahl

    2014-01-01

    of the following paper is to what extent the knowledge generated at the universities can be transferred directly to a university college context? The second question raised is centered on the “what” of entrepreneurship education relating to content: How can educational elements that enable and promote...... educational institutions have been imposed to foster entrepreneurs, a need for knowledge in terms of the Where, What, When, Who and How of entrepreneurship education (Hindle, 2007) has emerged. In the light of the context dependency of entrepreneurship education (Hannon P. D., 2006), the first main question...... entrepreneurship at university colleges be identified in order to solidify the entrepreneurial education? If cases where students have become entrepreneurs are studied, as a method to identify entrepreneurship supporting and enabling educational elements, a future research question is raised: “How do student...

  3. Benchmarking in University Toolbox

    Directory of Open Access Journals (Sweden)

    Katarzyna Kuźmicz

    2015-06-01

    Full Text Available In the face of global competition and rising challenges that higher education institutions (HEIs meet, it is imperative to increase innovativeness and efficiency of their management. Benchmarking can be the appropriate tool to search for a point of reference necessary to assess institution’s competitive position and learn from the best in order to improve. The primary purpose of the paper is to present in-depth analysis of benchmarking application in HEIs worldwide. The study involves indicating premises of using benchmarking in HEIs. It also contains detailed examination of types, approaches and scope of benchmarking initiatives. The thorough insight of benchmarking applications enabled developing classification of benchmarking undertakings in HEIs. The paper includes review of the most recent benchmarking projects and relating them to the classification according to the elaborated criteria (geographical range, scope, type of data, subject, support and continuity. The presented examples were chosen in order to exemplify different approaches to benchmarking in higher education setting. The study was performed on the basis of the published reports from benchmarking projects, scientific literature and the experience of the author from the active participation in benchmarking projects. The paper concludes with recommendations for university managers undertaking benchmarking, derived on the basis of the conducted analysis.

  4. Microwave Frequency Multiplier

    Science.gov (United States)

    Velazco, J. E.

    2017-02-01

    High-power microwave radiation is used in the Deep Space Network (DSN) and Goldstone Solar System Radar (GSSR) for uplink communications with spacecraft and for monitoring asteroids and space debris, respectively. Intense X-band (7.1 to 8.6 GHz) microwave signals are produced for these applications via klystron and traveling-wave microwave vacuum tubes. In order to achieve higher data rate communications with spacecraft, the DSN is planning to gradually furnish several of its deep space stations with uplink systems that employ Ka-band (34-GHz) radiation. Also, the next generation of planetary radar, such as Ka-Band Objects Observation and Monitoring (KaBOOM), is considering frequencies in the Ka-band range (34 to 36 GHz) in order to achieve higher target resolution. Current commercial Ka-band sources are limited to power levels that range from hundreds of watts up to a kilowatt and, at the high-power end, tend to suffer from poor reliability. In either case, there is a clear need for stable Ka-band sources that can produce kilowatts of power with high reliability. In this article, we present a new concept for high-power, high-frequency generation (including Ka-band) that we refer to as the microwave frequency multiplier (MFM). The MFM is a two-cavity vacuum tube concept where low-frequency (2 to 8 GHz) power is fed into the input cavity to modulate and accelerate an electron beam. In the second cavity, the modulated electron beam excites and amplifies high-power microwaves at a frequency that is a multiple integer of the input cavity's frequency. Frequency multiplication factors in the 4 to 10 range are being considered for the current application, although higher multiplication factors are feasible. This novel beam-wave interaction allows the MFM to produce high-power, high-frequency radiation with high efficiency. A key feature of the MFM is that it uses significantly larger cavities than its klystron counterparts, thus greatly reducing power density and arcing

  5. LOFAR- The Low Frequency Array

    Science.gov (United States)

    Falcke, H. D. E.

    2006-08-01

    LOFAR is an innovative radio telescope in the frequency range of 10-240 MHz, realized as a phased array. It will become the largest radio telescope in the world in the time frame 2006-2010, located in Northern Europe. LOFAR is being implemented as a Wide Area Sensor Network which connects thousands of cheap sensors spread throughout the country to a central super computer using an ultra-broadband, synchronized data network. As the central processor IBM has provided its Blue Gene/L supercomputer. It will process streaming data with about 0.5 Terabit per second. Many simple radio antennas connected to the network turn it into a huge radio telescope for cosmological studies. In addition, geophones will turn LOFAR into an earthquake monitoring system and infrasound and meteorology sensors will turn LOFAR into a real-time weather monitoring array for agricultural applications. LOFAR is the first radio telescopes that can listen to radio signals from the entire sky overhead, on all time scales, at a large range of frequencies, and even look back in time for a couple of seconds. The main strength of LOFAR are surveys. One goal is to detect the first generation of black holes and galaxies in the universe during the epoch of reionization and study hydrogen formed after the big bang. LOFAR is also an ideal system to discover transient and sporadic radio signals. Likely transient sources to be discovered with LOFAR are bursting stars and Jupiter-like planets, gamma-ray bursts, radio outbursts from black holes, but also lightning on Earth and even radio flashes from ultra-high energy cosmic particles hitting the Earth atmosphere. Some LOFAR prototypes have recently been built. They have produced the first instantaneous all-sky maps and discovered the radio emission from cosmic particle air showers.

  6. Low frequency phase signal measurement with high frequency squeezing

    OpenAIRE

    Zhai, Zehui; Gao, Jiangrui

    2011-01-01

    We calculate the utility of high-frequency squeezed-state enhanced two-frequency interferometry for low-frequency phase measurement. To use the high-frequency sidebands of the squeezed light, a two-frequency intense laser is used in the interferometry instead of a single-frequency laser as usual. We find that the readout signal can be contaminated by the high-frequency phase vibration, but this is easy to check and avoid. A proof-of-principle experiment is in the reach of modern quantum optic...

  7. A Compact High Frequency Doppler Radio Scatterometer for Coastal Oceanography

    Science.gov (United States)

    Flament, P. J.; Harris, D.; Flament, M.; Fernandez, I. Q.; Hlivak, R.; Flores-vidal, X.; Marié, L.

    2016-12-01

    A low-power High Frequency Doppler Radar has been designed for large series production. The use of commercial-off-the-shelf components is maximized to minimize overall cost. Power consumption is reduced to 130W in full duty and 20W in stand-by under 20-36 V-DC, thus enabling solar/wind and/or fuel cell operation by default. For 8 channels, commercial components and sub-assemblies cost less than k20 excluding coaxial antenna cables, and less than four man-weeks of technician suffice for integration, testing and calibration, suggesting a final cost of about k36, based on production batches of 25 units. The instrument is integrated into passively-cooled 90x60x20 cm3 field-deployable enclosures, combining signal generation, transmitter, received, A/D converter and computer, alleviating the need for additional protection such as a container or building. It uses frequency-ramped continuous wave signals, and phased-array transmissions to decouple the direct path to the receivers. Five sub-assemblies are controlled by a Linux embedded computer: (i) direct digital synthesis of transmit and orthogonal local oscillator signals, derived from a low phase noise oven-controlled crystal; (ii) distributed power amplifiers totaling 5 W, integrated into λ/8 passive transmit antenna monopoles; (iii) λ/12 compact active receive antenna monopoles with embedded out-of-band rejection filters; (iv) analog receivers based on complex demodulation by double-balanced mixers, translating the HF spectrum to the audio band; (v) 24-bit analog-to-digital sigma-delta conversion at 12 kHz with 512x oversampling, followed by decimation to a final sampling frequency of 750 Hz. Except for the HF interference rejection filters, the electronics can operate between 3 and 50 MHz with no modification. At 13.5 MHz, 5 W transmit power, 15 min integration time, the high signal-to-noise ratio permits a typical range of 120 km for currents measurements with 8-antenna beam-forming. The University of Hawaii HFR

  8. Vortices at Microwave Frequencies

    Science.gov (United States)

    Silva, Enrico; Pompeo, Nicola; Dobrovolskiy, Oleksandr V.

    2017-11-01

    The behavior of vortices at microwave frequencies is an extremely useful source of information on the microscopic parameters that enter the description of the vortex dynamics. This feature has acquired particular relevance since the discovery of unusual superconductors, such as cuprates. Microwave investigation then extended its field of application to many families of superconductors, including the artificially nanostructured materials. It is then important to understand the basics of the physics of vortices moving at high frequency, as well as to understand what information the experiments can yield (and what they can not). The aim of this brief review is to introduce the readers to some basic aspects of the physics of vortices under a microwave electromagnetic field, and to guide them to an understanding of the experiment, also by means of the illustration of some relevant results.

  9. Breakfast frequency among adolescents

    DEFF Research Database (Denmark)

    Pedersen, Trine Pagh; Holstein, Bjørn E; Damsgaard, Mogens Trab

    2016-01-01

    , quality of family communication and family support. Further, analyses suggested that the associations were more pronounced among girls, immigrants and adolescents from other family structure than traditional. The study highlights the importance of the family setting in promoting regular breakfast......OBJECTIVE: To investigate (i) associations between adolescents' frequency of breakfast and family functioning (close relations to parents, quality of family communication and family support) and (ii) if any observed associations between breakfast frequency and family functioning vary...... by sociodemographic factors. DESIGN: School-based cross-sectional study. Students completed a web-based questionnaire. Associations were estimated by multilevel multivariate logistic regression. SETTING: Danish arm of the Health Behaviour in School-aged Children study, 2014. SUBJECTS: Adolescents aged 13 and 15 years...

  10. Ultra-sensitive NEMS-based cantilevers for sensing, scanned probe and very high-frequency applications.

    Science.gov (United States)

    Li, Mo; Tang, H X; Roukes, M L

    2007-02-01

    Scanning probe microscopies (SPM) and cantilever-based sensors generally use low-frequency mechanical devices of microscale dimensions or larger. Almost universally, off-chip methods are used to sense displacement in these devices, but this approach is not suitable for nanoscale devices. Nanoscale mechanical sensors offer a greatly enhanced performance that is unattainable with microscale devices. Here we describe the fabrication and operation of self-sensing nanocantilevers with fundamental mechanical resonances up to very high frequencies (VHF). These devices use integrated electronic displacement transducers based on piezoresistive thin metal films, permitting straightforward and optimal nanodevice readout. This non-optical transduction enables applications requiring previously inaccessible sensitivity and bandwidth, such as fast SPM and VHF force sensing. Detection of 127 MHz cantilever vibrations is demonstrated with a thermomechanical-noise-limited displacement sensitivity of 39 fm Hz(-1/2). Our smallest devices, with dimensions approaching the mean free path at atmospheric pressure, maintain high resonance quality factors in ambient conditions. This enables chemisorption measurements in air at room temperature, with unprecedented mass resolution less than 1 attogram (10(-18) g).

  11. Frequency steerable acoustic transducers

    Science.gov (United States)

    Senesi, Matteo

    Structural health monitoring (SHM) is an active research area devoted to the assessment of the structural integrity of critical components of aerospace, civil and mechanical systems. Guided wave methods have been proposed for SHM of plate-like structures using permanently attached piezoelectric transducers, which generate and sense waves to evaluate the presence of damage. Effective interrogation of structural health is often facilitated by sensors and actuators with the ability to perform electronic, i.e. phased array, scanning. The objective of this research is to design an innovative directional piezoelectric transducer to be employed for the localization of broadband acoustic events, or for the generation of Lamb waves for active interrogation of structural health. The proposed Frequency Steerable Acoustic Transducers (FSATs) are characterized by a spatial arrangement of active material which leads to directional characteristics varying with frequency. Thus FSATs can be employed both for directional sensing and generation of guided waves without relying on phasing and control of a large number of channels. The analytical expression of the shape of the FSATs is obtained through a theoretical formulation for continuously distributed active material as part of a shaped piezoelectric device. The FSAT configurations analyzed in this work are a quadrilateral array and a geometry which corresponds to a spiral in the wavenumber domain. The quadrilateral array is experimentally validated, confirming the concept of frequency-dependent directionality. Its limited directivity is improved by the Wavenumber Spiral FSAT (WS-FSAT), which, instead, is characterized by a continuous frequency dependent directionality. Preliminary validations of the WS-FSAT, using a laser doppler vibrometer, are followed by the implementation of the WS-FSAT as a properly shaped piezo transducer. The prototype is first used for localization of acoustic broadband sources. Signal processing

  12. Radio Frequency Spectrum Management

    Science.gov (United States)

    1980-03-01

    limits, emmission standards, etc., cover many pages. Other available non-technical policy statements are of the motherhood-and-apple-pie ilk. Further...and 2) by allowing the onscene commander who is acutely aware of the radio frequency emmission environment in his area to make assignments. The author...need for investment in specific human capi- tal vice on the job experience, it will never eliminate it. Rather vice education and training in

  13. Micro Ion Frequency Standard

    Science.gov (United States)

    2009-11-01

    Figure 6. (a) Fabricated VCSEL . (b) Emission spectrum of VCSEL at 1 mA drive current . As expected, our initial VCSEL wafers produced much less...light source at 369 nm. (a) (b) Figure 7. (a) 740-nm VCSEL output power and voltage versus current . (b) Periodically poled KTP crystal with...micro ion frequency standard and relevant current results. INTRODUCTION Vapor cell atomic clocks have seen extreme miniaturization within the past

  14. EO Domain Specific Knowledge Enabled Services (KES-B)

    Science.gov (United States)

    Varas, J.; Busto, J.; Torguet, R.

    2004-09-01

    This paper recovers and describes a number of major statements with respect to the vision, mission and technological approaches of the Technological Research Project (TRP) "EO Domain Specific Knowledge Enabled Services" (project acronym KES-B), which is currently under development at the European Space Research Institute (ESRIN) under contract "16397/02/I- SB". Resulting from the on-going R&D activities, the KES-B project aims are to demonstrate with a prototype system the feasibility of the application of innovative knowledge-based technologies to provide services for easy, scheduled and controlled exploitation of EO resources (e.g.: data, algorithms, procedures, storage, processors, ...), to automate the generation of products, and to support users in easily identifying and accessing the required information or products by using their own vocabulary, domain knowledge and preferences. The ultimate goals of KES-B are summarized in the provision of the two main types of KES services: 1st the Search service (also referred to as Product Exploitation or Information Retrieval; and 2nd the Production service (also referred to as Information Extraction), with the strategic advantage that they are enabled by Knowledge consolidated (formalized) within the system. The KES-B system technical solution approach is driven by a strong commitment for the adoption of industry (XML-based) language standards, aiming to have an interoperable, scalable and flexible operational prototype. In that sense, the Search KES services builds on the basis of the adoption of consolidated and/or emergent W3C semantic-web standards. Remarkably the languages/models Dublin Core (DC), Universal Resource Identifier (URI), Resource Description Framework (RDF) and Ontology Web Language (OWL), and COTS like Protege [1] and JENA [2] are being integrated in the system as building bricks for the construction of the KES based Search services. On the other hand, the Production KES services builds on top of

  15. A data management system to enable urgent natural disaster computing

    Science.gov (United States)

    Leong, Siew Hoon; Kranzlmüller, Dieter; Frank, Anton

    2014-05-01

    consequences Hard deadline: Missing a hard deadline renders the computation useless and results in full catastrophic consequences. A prototype of this system has a REST-based service manager. The REST-based implementation provides a uniform interface that is easy to use. New and upcoming file transfer protocols can easily be extended and accessed via the service manager. The service manager interacts with the other four managers to coordinate the data activities so that the fundamental natural disaster urgent computing requirement, i.e. deadline, can be fulfilled in a reliable manner. A data activity can include data storing, data archiving and data storing. Reliability is ensured by the choice of a network of managers organisation model[1] the configuration manager and the fault tolerance manager. With this proposed design, an easy to use, resource-independent data management system that can support and fulfill the computation of a natural disaster prediction within stipulated deadlines can thus be realised. References [1] H. G. Hegering, S. Abeck, and B. Neumair, Integrated management of networked systems - concepts, architectures, and their operational application, Morgan Kaufmann Publishers, 340 Pine Stret, Sixth Floor, San Francisco, CA 94104-3205, USA, 1999. [2] H. Kopetz, Real-time systems design principles for distributed embedded applications, second edition, Springer, LLC, 233 Spring Street, New York, NY 10013, USA, 2011. [3] S. H. Leong, A. Frank, and D. Kranzlmu¨ ller, Leveraging e-infrastructures for urgent computing, Procedia Computer Science 18 (2013), no. 0, 2177 - 2186, 2013 International Conference on Computational Science. [4] N. Trebon, Enabling urgent computing within the existing distributed computing infrastructure, Ph.D. thesis, University of Chicago, August 2011, http://people.cs.uchicago.edu/~ntrebon/docs/dissertation.pdf.

  16. Recursive Time-Frequency Reassignment

    OpenAIRE

    Nilsen, Geir Kjetil

    2007-01-01

    A fast algorithm for producing time-frequency representations (TFRs) is proposed. The resulting TFRs have optional time-frequency resolution up to optimality. The algorithm is further extended with a method known as time-frequency reassignment. The main implication is that time-frequency reassignment now becomes well suited for real-time implementations.

  17. Using Texting to Support Students' Transition to University

    Science.gov (United States)

    Harley, Dave; Winn, Sandra; Pemberton, Sarah; Wilcox, Paula

    2007-01-01

    This article argues that judicious use of mobile phone text messaging by university staff has the potential to enhance the support provided to students by an academic department during the transition to university. It reports on an evaluation of a desktop computer application, "Student Messenger," which enables staff to send text…

  18. Association of Universities and Colleges of Canada Partnership ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    For almost 30 years, IDRC has enabled the Association of Universities and Colleges of Canada to provide Canadian universities with liaison and information services on ... International Development Week, observed February 4-10 this year, is an opportunity to focus on Canada's contributions to global development.

  19. A Space-Qualified Single Frequency Fiber Laser for LISA Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Single frequency high power lasers have been considered to be an enabling technology for NASA's Laser Interferometer Space Antenna (LISA). PolarOnyx proposes, for...

  20. A near infrared laser frequency comb for high precision Doppler planet surveys

    Directory of Open Access Journals (Sweden)

    Bally J.

    2011-07-01

    Full Text Available Perhaps the most exciting area of astronomical research today is the study of exoplanets and exoplanetary systems, engaging the imagination not just of the astronomical community, but of the general population. Astronomical instrumentation has matured to the level where it is possible to detect terrestrial planets orbiting distant stars via radial velocity (RV measurements, with the most stable visible light spectrographs reporting RV results the order of 1 m/s. This, however, is an order of magnitude away from the precision needed to detect an Earth analog orbiting a star such as our sun, the Holy Grail of these efforts. By performing these observations in near infrared (NIR there is the potential to simplify the search for distant terrestrial planets by studying cooler, less massive, much more numerous class M stars, with a tighter habitable zone and correspondingly larger RV signal. This NIR advantage is undone by the lack of a suitable high precision, high stability wavelength standard, limiting NIR RV measurements to tens or hundreds of m/s [1, 2]. With the improved spectroscopic precision provided by a laser frequency comb based wavelength reference producing a set of bright, densely and uniformly spaced lines, it will be possible to achieve up to two orders of magnitude improvement in RV precision, limited only by the precision and sensitivity of existing spectrographs, enabling the observation of Earth analogs through RV measurements. We discuss the laser frequency comb as an astronomical wavelength reference, and describe progress towards a near infrared laser frequency comb at the National Institute of Standards and Technology and at the University of Colorado where we are operating a laser frequency comb suitable for use with a high resolution H band astronomical spectrograph.

  1. LOFAR/H-ATLAS: The low-frequency radio luminosity - star-formation rate relation

    Science.gov (United States)

    Gürkan, G.; Hardcastle, MJ; Smith, DJB; Best, PN; Bourne, N.; Calistro-Rivera, G.; Heald, G.; Jarvis, MJ; Prandoni, I.; Röttgering, H. J. A.; Sabater, J.; Shimwell, T.; Tasse, C.; Williams, WL

    2018-01-01

    Radio emission is a key indicator of star-formation activity in galaxies, but the radio luminosity-star formation relation has to date been studied almost exclusively at frequencies of 1.4 GHz or above. At lower radio frequencies the effects of thermal radio emission are greatly reduced, and so we would expect the radio emission observed to be completely dominated by synchrotron radiation from supernova-generated cosmic rays. As part of the LOFAR Surveys Key Science project, the Herschel-ATLAS NGP field has been surveyed with LOFAR at an effective frequency of 150 MHz. We select a sample from the MPA-JHU catalogue of SDSS galaxies in this area: the combination of Herschel, optical and mid-infrared data enable us to derive star-formation rates (SFRs) for our sources using spectral energy distribution fitting, allowing a detailed study of the low-frequency radio luminosity-star-formation relation in the nearby Universe. For those objects selected as star-forming galaxies (SFGs) using optical emission line diagnostics, we find a tight relationship between the 150 MHz radio luminosity (L150) and SFR. Interestingly, we find that a single power-law relationship between L150 and SFR is not a good description of all SFGs: a broken power law model provides a better fit. This may indicate an additional mechanism for the generation of radio-emitting cosmic rays. Also, at given SFR, the radio luminosity depends on the stellar mass of the galaxy. Objects which were not classified as SFGs have higher 150-MHz radio luminosity than would be expected given their SFR, implying an important role for low-level active galactic nucleus activity.

  2. Tuningless Load Frequency Control Through Active Engagement of Distributed Resources

    DEFF Research Database (Denmark)

    Prostejovsky, Alexander; Marinelli, Mattia; Rezkalla, Michel M.N.

    2017-01-01

    The increasing share of volatile and inverter-based energy sources render electric power grids increasingly susceptible to disturbances. Established Load Frequency Control (LFC) schemes are rigid and require careful tuning, making them unsuitable for dynamically changing environments. In this paper......, we present a fast and tuningless frequency control approach that tackles these shortcomings by means of modern grid monitoring and communications infrastructures in a two-fold concurrent process. First, direct observation of supply and demand enables fast power balancing decoupled from the total...... system dynamics. Second, primary resources are actively involved in frequency restoration by systematic adjustment of their frequency reference setpoints. In contrast to the commonly used Automatic Generation Control (AGC), the proposed Direct Load Frequency Control (DLFC) does not require an integrator...

  3. Optimizing DER Participation in Inertial and Primary-Frequency Response

    Energy Technology Data Exchange (ETDEWEB)

    Dall-Anese, Emiliano [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Zhao, Changhong [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Guggilam, Swaroop [University of Minnesota; Dhople, Sairaj [University of Minnesota; Chen, Yu Christine [University of British Columbia

    2018-01-25

    This paper develops an approach to enable the optimal participation of distributed energy resources (DERs) in inertial and primary-frequency response alongside conventional synchronous generators. Leveraging a reduced-order model description of frequency dynamics, DERs' synthetic inertias and droop coefficients are designed to meet time-domain performance objectives of frequency overshoot and steady-state regulation. Furthermore, an optimization-based method centered around classical economic dispatch is developed to ensure that DERs share the power injections for inertial- and primary-frequency response in proportion to their power ratings. Simulations for a modified New England test-case system composed of ten synchronous generators and six instances of the IEEE 37-node test feeder with frequency-responsive DERs validate the design strategy.

  4. Sound field control for a low-frequency test facility

    DEFF Research Database (Denmark)

    Pedersen, Christian Sejer; Møller, Henrik

    2013-01-01

    The two largest problems in controlling the reproduction of low-frequency sound for psychoacoustic experiments is the effect of the room due to standing waves and the relatively large sound pressure levels needed. Anechoic rooms are limited downward in frequency and distortion may be a problem even...... at moderate levels, while pressure-field playback can give higher sound pressures but is limited upwards in frequency. A new solution that addresses both problems has been implemented in the laboratory of Acoustics, Aalborg University. The solution uses one wall with 20 loudspeakers to generate a plane wave...... that is actively absorbed when it reaches the 20 loudspeakers on the opposing wall. This gives a homogeneous sound field in the majority of the room with a flat frequency response in the frequency range 2-300 Hz. The lowest frequencies are limited to sound pressure levels in the order of 95 dB. If larger levels...

  5. The Flipped Classroom, Disruptive Pedagogies, Enabling Technologies and Wicked Problems: Responding to "The Bomb in the Basement"

    Science.gov (United States)

    Hutchings, Maggie; Quinney, Anne

    2015-01-01

    The adoption of enabling technologies by universities provides unprecedented opportunities for flipping the classroom to achieve student-centred learning. While higher education policies focus on placing students at the heart of the education process, the propensity for student identities to shift from partners in learning to consumers of…

  6. Frequency locking of an extended-cavity quantum cascade laser to a frequency comb for precision mid infrared spectroscopy

    KAUST Repository

    Alsaif, Bidoor

    2017-11-02

    Extended-cavity quantum cascade lasers (EC-QCLs) enable mode-hope-free frequency sweeps in the mid-infrared region over ranges in excess of 100 cm−1, at speeds up to 1 THz/s and with a 100-mW optical power level. This makes them ideally suited for broadband absorption spectroscopy and for the simultaneous detection of multiple gases. On the other hand, their use for precision spectroscopy has been hampered so far by a large amount of frequency noise, resulting in an optical linewidth of about 30 MHz over 50 ms [1]. This is one of the reasons why neither their frequency nor their phase have been so far locked to a frequency comb. Their use in combination with frequency combs has been performed in an open loop regime only [2], which has the merit of preserving the inherently fast modulation speed of these lasers, yet not to afford high spectral resolution and accuracy.

  7. Rydberg-atom based radio-frequency electrometry using frequency modulation spectroscopy in room temperature vapor cells.

    Science.gov (United States)

    Kumar, Santosh; Fan, Haoquan; Kübler, Harald; Jahangiri, Akbar J; Shaffer, James P

    2017-04-17

    Rydberg atom-based electrometry enables traceable electric field measurements with high sensitivity over a large frequency range, from gigahertz to terahertz. Such measurements are particularly useful for the calibration of radio frequency and terahertz devices, as well as other applications like near field imaging of electric fields. We utilize frequency modulated spectroscopy with active control of residual amplitude modulation to improve the signal to noise ratio of the optical readout of Rydberg atom-based radio frequency electrometry. Matched filtering of the signal is also implemented. Although we have reached similarly, high sensitivity with other read-out methods, frequency modulated spectroscopy is advantageous because it is well-suited for building a compact, portable sensor. In the current experiment, ∼3 µV cm-1 Hz-1/2 sensitivity is achieved and is found to be photon shot noise limited.

  8. Low-frequency wideband vibration energy harvesting by using frequency up-conversion and quin-stable nonlinearity

    Science.gov (United States)

    Wang, Chen; Zhang, Qichang; Wang, Wei

    2017-07-01

    This work presents models and experiments of an impact-driven and frequency up-converted wideband piezoelectric-based vibration energy harvester with a quintuple-well potential induced by the combination effect of magnetic nonlinearity and mechanical piecewise-linearity. Analysis shows that the interwell motions during coupled vibration period enable to increase electrical power output in comparison to conventional frequency up-conversion technology. Besides, the quintuple-well potential with shallower potential wells could extend the harvester's operating bandwidth to lower frequencies. Experiments demonstrate our proposed approach can dramatically boost the measured power of the energy harvester as much as 35 times while its lower cut-off frequency is two times lower than that of a conventional counterpart. These results reveal our proposed approach shows promise for powering portable wireless smart devices from low-intensity, low-frequency vibration sources.

  9. MEMS Based Broadband Piezoelectric Ultrasonic Energy Harvester (PUEH) for Enabling Self-Powered Implantable Biomedical Devices

    Science.gov (United States)

    Shi, Qiongfeng; Wang, Tao; Lee, Chengkuo

    2016-01-01

    Acoustic energy transfer is a promising energy harvesting technology candidate for implantable biomedical devices. However, it does not show competitive strength for enabling self-powered implantable biomedical devices due to two issues – large size of bulk piezoelectric ultrasound transducers and output power fluctuation with transferred distance due to standing wave. Here we report a microelectromechanical systems (MEMS) based broadband piezoelectric ultrasonic energy harvester (PUEH) to enable self-powered implantable biomedical devices. The PUEH is a microfabricated lead zirconate titanate (PZT) diaphragm array and has wide operation bandwidth. By adjusting frequency of the input ultrasound wave within the operation bandwidth, standing wave effect can be minimized for any given distances. For example, at 1 cm distance, power density can be increased from 0.59 μW/cm2 to 3.75 μW/cm2 at input ultrasound intensity of 1 mW/cm2 when frequency changes from 250 to 240 kHz. Due to the difference of human body and manual surgical process, distance fluctuation for implantable biomedical devices is unavoidable and it strongly affects the coupling efficiency. This issue can be overcome by performing frequency adjustment of the PUEH. The proposed PUEH shows great potential to be integrated on an implanted biomedical device chip as power source for various applications. PMID:27112530

  10. Resonance frequency analysis

    Directory of Open Access Journals (Sweden)

    Rajiv K Gupta

    2011-01-01

    Full Text Available Initial stability at the placement and development of osseointegration are two major issues for implant survival. Implant stability is a mechanical phenomenon which is related to the local bone quality and quantity, type of implant, and placement technique used. The application of a simple, clinically applicable, non-invasive test to assess implant stability and osseointegration is considered highly desirable. Resonance frequency analysis (RFA is one of such techniques which is most frequently used now days. The aim of this paper was to review and analyze critically the current available literature in the field of RFA, and to also discuss based on scientific evidence, the prognostic value of RFA to detect implants at risk of failure. A search was made using the PubMed database to find all the literature published on "Resonance frequency analysis for implant stability" till date. Articles discussed in vivo or in vitro studies comparing RFA with other methods of implant stability measurement and articles discussing its reliability were thoroughly reviewed and discussed. A limited number of clinical reports were found. Various studies have demonstrated the feasibility and predictability of the technique. However, most of these articles are based on retrospective data or uncontrolled cases. Randomized, prospective, parallel-armed longitudinal human trials are based on short-term results and long-term follow up are still scarce in this field. Nonetheless, from available literature, it may be concluded that RFA technique evaluates implant stability as a function of stiffness of the implant bone interface and is influenced by factors such as bone type, exposed implant height above the alveolar crest. Resonance frequency analysis could serve as a non-invasive diagnostic tool for detecting the implant stability of dental implants during the healing stages and in subsequent routine follow up care after treatment. Future studies, preferably randomized

  11. University Student Attitudes and Behavior Toward Drugs.

    Science.gov (United States)

    Horowitz, Joseph L.; Sedlacek, William E.

    To investigate incidence and frequency of use of 8 drugs ranging from marijuana to LSD to heroin, 2 anonymous polls were administered to 2,141 incoming freshmen and returning students at the University of Maryland during the summer and fall of 1971. Students' reasons for using and not using drugs, students' attitudes toward legalizing, using, and…

  12. Empowering University Students through Physical Fitness for ...

    African Journals Online (AJOL)

    This paper reports the findings of a study that investigated 252 University of Ilorin students' awareness of the benefits of physical fitness and the need for empowering them for lifetime productivity. Data were collected using a self developed questionnaire and analysed using frequency counts, percentage and chi-square.

  13. Introducing RFID at Middlesex University Learning Resources

    Science.gov (United States)

    Hopkinson, Alan; Chandrakar, Rajesh

    2006-01-01

    Purpose: To describe the first year of the implementation of radio frequency identification (RFID) in Middlesex University Learning Resources. Design/methodology/approach: The technology is explained in detail to set the scene. Information on the implementation is presented in chronological order. Findings: Problems which would generally be…

  14. Origin (?) of the Universe

    Indian Academy of Sciences (India)

    Origin (?) of the Universe. 2. The Expanding Universe. Jayant Narlikar, Director,. Inter-University Centre for Astronomy and. Astrophysics, works on action at a distance in physics, new theories of gravitation and new models of the universe. He has made strong efforts to promote teaching and research in astronomy in.

  15. The Global University Press

    Science.gov (United States)

    Dougherty, Peter J.

    2012-01-01

    The modern world's understanding of American university press has long been shaped by university-press books. American university-press books are good international advertisements for the universities whose logos grace their spines. The growth of transnational scholarship and the expansion of digital communications networks are converging in ways…

  16. On universal quantum dimensions

    Science.gov (United States)

    Mkrtchyan, R. L.

    2017-08-01

    We represent in the universal form restricted one-instanton partition function of supersymmetric Yang-Mills theory. It is based on the derivation of universal expressions for quantum dimensions (universal characters) of Cartan powers of adjoint and some other series of irreps of simple Lie algebras. These formulae also provide a proof of formulae for universal quantum dimensions for low-dimensional representations, needed in derivation of universal knot polynomials (i.e. colored Wilson averages of Chern-Simons theory on 3d sphere). As a check of the (complicated) formulae for universal quantum dimensions we prove numerically Deligne's hypothesis on universal characters for symmetric cube of adjoint representation.

  17. Quantum Phase Transition and Universal Dynamics in the Rabi Model.

    Science.gov (United States)

    Hwang, Myung-Joong; Puebla, Ricardo; Plenio, Martin B

    2015-10-30

    We consider the Rabi Hamiltonian, which exhibits a quantum phase transition (QPT) despite consisting only of a single-mode cavity field and a two-level atom. We prove QPT by deriving an exact solution in the limit where the atomic transition frequency in the unit of the cavity frequency tends to infinity. The effect of a finite transition frequency is studied by analytically calculating finite-frequency scaling exponents as well as performing a numerically exact diagonalization. Going beyond this equilibrium QPT setting, we prove that the dynamics under slow quenches in the vicinity of the critical point is universal; that is, the dynamics is completely characterized by critical exponents. Our analysis demonstrates that the Kibble-Zurek mechanism can precisely predict the universal scaling of residual energy for a model without spatial degrees of freedom. Moreover, we find that the onset of the universal dynamics can be observed even with a finite transition frequency.

  18. One-way quantum computing in the optical frequency comb.

    Science.gov (United States)

    Menicucci, Nicolas C; Flammia, Steven T; Pfister, Olivier

    2008-09-26

    One-way quantum computing allows any quantum algorithm to be implemented easily using just measurements. The difficult part is creating the universal resource, a cluster state, on which the measurements are made. We propose a scalable method that uses a single, multimode optical parametric oscillator (OPO). The method is very efficient and generates a continuous-variable cluster state, universal for quantum computation, with quantum information encoded in the quadratures of the optical frequency comb of the OPO.

  19. Behavioral estimates of human frequency selectivity at low frequencies

    DEFF Research Database (Denmark)

    Orellana, Carlos Andrés Jurado

    on physical sound measurements. In this PhD thesis a detailed description of frequency selectivity at low frequencies is given. Different experiments have been performed to determine the properties of human auditory filters. Besides, loudness perception of low-frequency sinusoidal signals has been evaluated...

  20. Universal emergence of PageRank

    Energy Technology Data Exchange (ETDEWEB)

    Frahm, K M; Georgeot, B; Shepelyansky, D L, E-mail: frahm@irsamc.ups-tlse.fr, E-mail: georgeot@irsamc.ups-tlse.fr, E-mail: dima@irsamc.ups-tlse.fr [Laboratoire de Physique Theorique du CNRS, IRSAMC, Universite de Toulouse, UPS, 31062 Toulouse (France)

    2011-11-18

    The PageRank algorithm enables us to rank the nodes of a network through a specific eigenvector of the Google matrix, using a damping parameter {alpha} Element-Of ]0, 1[. Using extensive numerical simulations of large web networks, with a special accent on British University networks, we determine numerically and analytically the universal features of the PageRank vector at its emergence when {alpha} {yields} 1. The whole network can be divided into a core part and a group of invariant subspaces. For {alpha} {yields} 1, PageRank converges to a universal power-law distribution on the invariant subspaces whose size distribution also follows a universal power law. The convergence of PageRank at {alpha} {yields} 1 is controlled by eigenvalues of the core part of the Google matrix, which are extremely close to unity, leading to large relaxation times as, for example, in spin glasses. (paper)

  1. Ceramic Electrolyte Membrane Technology: Enabling Revolutionary Electrochemical Energy Storage

    Science.gov (United States)

    2015-10-05

    Sep-2014 Approved for Public Release; Distribution Unlimited Final Report: Ceramic Electrolyte Membrane Technology : Enabling Revolutionary...2601 30-Sep-2014 ABSTRACT Number of Papers published in peer-reviewed journals: Final Report: Ceramic Electrolyte Membrane Technology : Enabling... technology to fabricate larger LLZO ceramic membranes . The goal of this work is to develop ceramic processing technology to fabricate LLZO membranes that

  2. Using Computational Toxicology to Enable Risk-Based ...

    Science.gov (United States)

    presentation at Drug Safety Gordon Research Conference 2016 on research efforts in NCCT to enable Computational Toxicology to support risk assessment. Slide presentation at Drug Safety Gordon Research Conference 2016 on research efforts in NCCT to enable Computational Toxicology to support risk assessment.

  3. Creating Enabling Environments for Small and Medium Enterprises ...

    African Journals Online (AJOL)

    It has been observed that small and medium scale enterprise ( SME) are the bedrock of a nation\\'s industrial and technological advancement. Hence, creating an enabling environment for SMEs to thrive will result in development. This paper examines the enabling environment with particular reference to good governance ...

  4. Enabling performance measurement in a small professional service firm.

    NARCIS (Netherlands)

    Groen, B.A.C.; van de Belt, Mirthe; Wilderom, Celeste P.M.

    2012-01-01

    Purpose – The purpose of this paper is to show why developing an enabling performance measurement system (PMS) can be useful to small professional service firms (PSFs) and how small PSFs can develop such an enabling PMS. Design/methodology/approach – The authors used a process‐consultation type of

  5. AFC-Enabled Vertical Tail System Integration Study

    Science.gov (United States)

    Mooney, Helen P.; Brandt, John B.; Lacy, Douglas S.; Whalen, Edward A.

    2014-01-01

    This document serves as the final report for the SMAAART AFC-Enabled Vertical Tail System Integration Study. Included are the ground rule assumptions which have gone into the study, layouts of the baseline and AFC-enabled configurations, critical sizing information, system requirements and architectures, and assumed system properties that result in an NPV assessment of the two candidate AFC technologies.

  6. Optical frequency divider with division uncertainty at the 10^(-21) level

    CERN Document Server

    Yao, Yuan; Yu, Hongfu; Bi, Zhiyi; Ma, Longsheng

    2016-01-01

    Optical clocks with unprecedented accuracy of 10^(-18) will lead to innovations in many research areas. All the applications of optical clocks rely on the ability of precisely converting the frequency from one optical clock to another, or particularly to the frequencies in the fiber telecom band for long-distance transmission. Here, we report a low-noise, high precision optical frequency divider. It can realize accurate optical frequency conversion as well as enable precise measurement of optical frequency ratios. By comparing against the frequency ratio between the fundamental and the second harmonic of a 1064 nm laser rather than a second similar system, the optical frequency divider is demonstrated to have a frequency division instability of 6e-19 at 1 s and a fractional frequency division uncertainty of 1.4e-21, nearly three orders of magnitude better than the most accurate optical clocks. It allows optical clocks to be accessible to many precision measurement applications.

  7. High-frequency Rayleigh-wave method

    Science.gov (United States)

    Xia, J.; Miller, R.D.; Xu, Y.; Luo, Y.; Chen, C.; Liu, J.; Ivanov, J.; Zeng, C.

    2009-01-01

    High-frequency (???2 Hz) Rayleigh-wave data acquired with a multichannel recording system have been utilized to determine shear (S)-wave velocities in near-surface geophysics since the early 1980s. This overview article discusses the main research results of high-frequency surface-wave techniques achieved by research groups at the Kansas Geological Survey and China University of Geosciences in the last 15 years. The multichannel analysis of surface wave (MASW) method is a non-invasive acoustic approach to estimate near-surface S-wave velocity. The differences between MASW results and direct borehole measurements are approximately 15% or less and random. Studies show that simultaneous inversion with higher modes and the fundamental mode can increase model resolution and an investigation depth. The other important seismic property, quality factor (Q), can also be estimated with the MASW method by inverting attenuation coefficients of Rayleigh waves. An inverted model (S-wave velocity or Q) obtained using a damped least-squares method can be assessed by an optimal damping vector in a vicinity of the inverted model determined by an objective function, which is the trace of a weighted sum of model-resolution and model-covariance matrices. Current developments include modeling high-frequency Rayleigh-waves in near-surface media, which builds a foundation for shallow seismic or Rayleigh-wave inversion in the time-offset domain; imaging dispersive energy with high resolution in the frequency-velocity domain and possibly with data in an arbitrary acquisition geometry, which opens a door for 3D surface-wave techniques; and successfully separating surface-wave modes, which provides a valuable tool to perform S-wave velocity profiling with high-horizontal resolution. ?? China University of Geosciences (Wuhan) and Springer-Verlag GmbH 2009.

  8. Freqüência de indivíduos com intolerância à glicose em jejum em um hospital universitário: comparação de critérios diagnósticos Frequency of individuals with impaired fasting glucose in a university hospital: comparison of diagnostic criteria

    Directory of Open Access Journals (Sweden)

    Dilênia de Oliveira Cipriano

    2006-12-01

    Full Text Available A intolerância à glicose de jejum (IGJ, uma condição metabólica que na maioria das vezes precede o diabetes, geralmente não causa sintomas, necessitando da dosagem da glicemia de jejum para ser diagnosticada. Em 2003, o Comitê de Especialistas em Diagnóstico e Classificação do Diabetes Mellitus (Expert Committee on the Diagnosis and Classification of Diabetes Mellitus recomendou a redução do ponto de corte para o diagnóstico da IGJ de 110mg/dl para 100mg/dl, endossado pela Sociedade Brasileira de Diabetes (SBD, em 2005. No entanto ainda não há consenso sobre a adoção desses valores. O objetivo deste estudo foi avaliar a freqüência de pacientes com IGJ atendidos, de agosto a novembro de 2005, no Hospital Universitário Oswaldo Cruz da Universidade de Pernambuco (HUOC/UPE, comparando os critérios de diagnóstico. Foram avaliadas glicemias de 428 indivíduos, sendo 65% do sexo feminino. A média de idade dos pacientes foi de 52,3 anos (± 15,4, sendo que 78,3% desses estavam na faixa etária 40 anos. Do total da amostra, 4% tiveram glicemia de jejum sugestiva de diabetes ( 126mg/dl, enquanto 7% dos resultados foram compatíveis com IGJ, segundo os critérios anteriormente adotados ( 110mg/dl e Impaired fasting glucose (IFG, a condition that most times precedes diabetes, generally does not produce any symptoms. In 2003, the Expert Committee on the Diagnosis and Classification of Diabetes Mellitus recommended a lower cutoff point (from 110mg/dl to 100mg/dl for fasting plasma glucose to confirm its diagnosis, a measure officially endorsed by the Brazilian Society of Diabetes (BSD in 2005. The objective of this study was to evaluate the frequency of patients who presented IFG seen at the State University Hospital Oswaldo Cruz, utilizing both criteria of diagnosis, from August to November 2005. The sample consisted of 428 individuals, 65% of whom were females, with a mean age of 52.3 years (± 15.4 and a percentage of 78.3% of this

  9. Ocean World Exploration and SLS: Enabling the Search for Life

    Science.gov (United States)

    Creech, Stephen D.; Vane, Greg

    2016-01-01

    Whether life exists on worlds other than Earth is one of the most compelling questions facing space science today. Given that, on Earth, life exists wherever water is found, worlds harboring large amounts of water are prime targets in the search for an answer to this question. Jovian moons Europa, Callisto, and Ganymede; Saturnian moons Enceladus and Titan; and possibly Neptune's Triton are all worlds in the outer solar system on which large quantities of water can be found in solid and liquid form. So compelling are these worlds as targets for scientific study that the United States Congress recently initiated a directive to NASA to create an "Ocean Worlds Exploration Program, comprised of frequent small, medium and large missions that poses the potential to revolutionize our understanding of the solar system and life within it, perhaps more profoundly event than the modern-day search for past or extant life on Mars. Any life detected at the remote "ocean worlds" in the outer solar system would likely have formed and evolved along an independent path from life on Earth itself, giving us a deeper understanding of the potential for broad variety amongst life in the universe. In NASA's robotic study of Mars, a key to the success of the "search for water" was the ability to conduct iterative exploration via a series of missions launched on a regular cadence based on 26-month cycles of prime planetary-alignment windows of reduced transit time. Through this cadence, NASA was able to send to Mars a series of orbiters and landers, using the knowledge gained from each mission to inform and refine the goals of the next. The ability to conduct iterative exploration in this manner could have a substantial impact on exploration of the "ocean worlds," allowing scientists to narrow their targets of interest in the search for life based on data sent back by successive missions. This ability is currently limited by the transit periods available from contemporary evolved expendable

  10. Sensitivity of echo enabled harmonic generation to sinusoidal electron beam energy structure

    Science.gov (United States)

    Hemsing, E.; Garcia, B.; Huang, Z.; Raubenheimer, T.; Xiang, D.

    2017-06-01

    We analytically examine the bunching factor spectrum of a relativistic electron beam with sinusoidal energy structure that then undergoes an echo-enabled harmonic generation (EEHG) transformation to produce high harmonics. The performance is found to be described primarily by a simple scaling parameter. The dependence of the bunching amplitude on fluctuations of critical parameters is derived analytically, and compared with simulations. Where applicable, EEHG is also compared with high gain harmonic generation (HGHG) and we find that EEHG is generally less sensitive to several types of energy structure. In the presence of intermediate frequency modulations like those produced by the microbunching instability, EEHG has a substantially narrower intrinsic bunching pedestal.

  11. High frequency nanotube oscillator

    Science.gov (United States)

    Peng, Haibing [Houston, TX; Zettl, Alexander K [Kensington, TX

    2012-02-21

    A tunable nanostructure such as a nanotube is used to make an electromechanical oscillator. The mechanically oscillating nanotube can be provided with inertial clamps in the form of metal beads. The metal beads serve to clamp the nanotube so that the fundamental resonance frequency is in the microwave range, i.e., greater than at least 1 GHz, and up to 4 GHz and beyond. An electric current can be run through the nanotube to cause the metal beads to move along the nanotube and changing the length of the intervening nanotube segments. The oscillator can operate at ambient temperature and in air without significant loss of resonance quality. The nanotube is can be fabricated in a semiconductor style process and the device can be provided with source, drain, and gate electrodes, which may be connected to appropriate circuitry for driving and measuring the oscillation. Novel driving and measuring circuits are also disclosed.

  12. Frequency selective bolometers

    DEFF Research Database (Denmark)

    Kowitt, M.S.; Fixsen, D.J.; Goldin, A.

    1996-01-01

    We propose a concept for radiometry in the millimeter, the submillimeter, and the far-IR spectral regions, the frequency selective bolometer (FSB). This system uses a bolometer as a coupled element of a tuned quasi-optical interference filter in which the absorption, the transmission......-dimensional transmission-line model. Instruments based on FSB technology should have several advantages over current multiband bolometric radiometers including smaller and more compact cryogenic optics; reduced demands on cryostat size and weight, high coupling efficiency, minimum constraints on the geometry in the focal...... plane. An FSB system can be configured as a multiband, close-packed focal-plane array, permitting efficient use of the throughput of a telescope....

  13. Instantaneous Frequency Attribute Comparison

    Science.gov (United States)

    Yedlin, M. J.; Margrave, G. F.; Ben Horin, Y.

    2013-12-01

    The instantaneous seismic data attribute provides a different means of seismic interpretation, for all types of seismic data. It first came to the fore in exploration seismology in the classic paper of Taner et al (1979), entitled " Complex seismic trace analysis". Subsequently a vast literature has been accumulated on the subject, which has been given an excellent review by Barnes (1992). In this research we will compare two different methods of computation of the instantaneous frequency. The first method is based on the original idea of Taner et al (1979) and utilizes the derivative of the instantaneous phase of the analytic signal. The second method is based on the computation of the power centroid of the time-frequency spectrum, obtained using either the Gabor Transform as computed by Margrave et al (2011) or the Stockwell Transform as described by Stockwell et al (1996). We will apply both methods to exploration seismic data and the DPRK events recorded in 2006 and 2013. In applying the classical analytic signal technique, which is known to be unstable, due to the division of the square of the envelope, we will incorporate the stabilization and smoothing method proposed in the two paper of Fomel (2007). This method employs linear inverse theory regularization coupled with the application of an appropriate data smoother. The centroid method application is straightforward and is based on the very complete theoretical analysis provided in elegant fashion by Cohen (1995). While the results of the two methods are very similar, noticeable differences are seen at the data edges. This is most likely due to the edge effects of the smoothing operator in the Fomel method, which is more computationally intensive, when an optimal search of the regularization parameter is done. An advantage of the centroid method is the intrinsic smoothing of the data, which is inherent in the sliding window application used in all Short-Time Fourier Transform methods. The Fomel technique

  14. Robust power system frequency control

    CERN Document Server

    Bevrani, Hassan

    2014-01-01

    This updated edition of the industry standard reference on power system frequency control provides practical, systematic and flexible algorithms for regulating load frequency, offering new solutions to the technical challenges introduced by the escalating role of distributed generation and renewable energy sources in smart electric grids. The author emphasizes the physical constraints and practical engineering issues related to frequency in a deregulated environment, while fostering a conceptual understanding of frequency regulation and robust control techniques. The resulting control strategi

  15. Universal platform for quantitative analysis of DNA transposition

    Directory of Open Access Journals (Sweden)

    Pajunen Maria I

    2010-11-01

    Full Text Available Abstract Background Completed genome projects have revealed an astonishing diversity of transposable genetic elements, implying the existence of novel element families yet to be discovered from diverse life forms. Concurrently, several better understood transposon systems have been exploited as efficient tools in molecular biology and genomics applications. Characterization of new mobile elements and improvement of the existing transposition technology platforms warrant easy-to-use assays for the quantitative analysis of DNA transposition. Results Here we developed a universal in vivo platform for the analysis of transposition frequency with class II mobile elements, i.e., DNA transposons. For each particular transposon system, cloning of the transposon ends and the cognate transposase gene, in three consecutive steps, generates a multifunctional plasmid, which drives inducible expression of the transposase gene and includes a mobilisable lacZ-containing reporter transposon. The assay scores transposition events as blue microcolonies, papillae, growing within otherwise whitish Escherichia coli colonies on indicator plates. We developed the assay using phage Mu transposition as a test model and validated the platform using various MuA transposase mutants. For further validation and to illustrate universality, we introduced IS903 transposition system components into the assay. The developed assay is adjustable to a desired level of initial transposition via the control of a plasmid-borne E. coli arabinose promoter. In practice, the transposition frequency is modulated by varying the concentration of arabinose or glucose in the growth medium. We show that variable levels of transpositional activity can be analysed, thus enabling straightforward screens for hyper- or hypoactive transposase mutants, regardless of the original wild-type activity level. Conclusions The established universal papillation assay platform should be widely applicable to a

  16. Integrated nanophotonic frequency shifter on the silicon-organic hybrid (SOH) platform for laser vibrometry

    Energy Technology Data Exchange (ETDEWEB)

    Lauermann, M.; Weimann, C.; Palmer, R.; Schindler, P. C. [Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology, 76131 Karlsruhe (Germany); Koeber, S.; Freude, W., E-mail: christian.koos@kit.edu; Koos, C., E-mail: christian.koos@kit.edu [Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany and Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen (Germany); Rembe, C. [Polytec GmbH, 76337 Waldbronn (Germany)

    2014-05-27

    We demonstrate a waveguide-based frequency shifter on the silicon photonic platform, enabling frequency shifts up to 10 GHz. The device is realized by silicon-organic hybrid (SOH) integration. Temporal shaping of the drive signal allows the suppression of spurious side-modes by more than 23 dB.

  17. Nonlinear-optical up and down frequency-converting backward-wave metasensors and metamirrors

    CERN Document Server

    Popov, Alexander K; Myslivets, Sergey A; Shalaev, Mikhail I; Slabko, Vitaly V

    2013-01-01

    A concept of a family of unique backward-wave photonic devices, such as frequency up and down converting nonlinear-optical mirrors, sensors, modulators, filters and amplifiers is proposed. Novel materials are considered, which support coexistence of ordinary and backward waves and thus enable enhanced nonlinear-optical frequency-conversion processes. Particular properties of short-pulse regime are investigated.

  18. Genome Enabled Discovery of Carbon Sequestration Genes in Poplar

    Energy Technology Data Exchange (ETDEWEB)

    Filichkin, Sergei; Etherington, Elizabeth; Ma, Caiping; Strauss, Steve

    2007-02-22

    The goals of the S.H. Strauss laboratory portion of 'Genome-enabled discovery of carbon sequestration genes in poplar' are (1) to explore the functions of candidate genes using Populus transformation by inserting genes provided by Oakridge National Laboratory (ORNL) and the University of Florida (UF) into poplar; (2) to expand the poplar transformation toolkit by developing transformation methods for important genotypes; and (3) to allow induced expression, and efficient gene suppression, in roots and other tissues. As part of the transformation improvement effort, OSU developed transformation protocols for Populus trichocarpa 'Nisqually-1' clone and an early flowering P. alba clone, 6K10. Complete descriptions of the transformation systems were published (Ma et. al. 2004, Meilan et. al 2004). Twenty-one 'Nisqually-1' and 622 6K10 transgenic plants were generated. To identify root predominant promoters, a set of three promoters were tested for their tissue-specific expression patterns in poplar and in Arabidopsis as a model system. A novel gene, ET304, was identified by analyzing a collection of poplar enhancer trap lines generated at OSU (Filichkin et. al 2006a, 2006b). Other promoters include the pGgMT1 root-predominant promoter from Casuarina glauca and the pAtPIN2 promoter from Arabidopsis root specific PIN2 gene. OSU tested two induction systems, alcohol- and estrogen-inducible, in multiple poplar transgenics. Ethanol proved to be the more efficient when tested in tissue culture and greenhouse conditions. Two estrogen-inducible systems were evaluated in transgenic Populus, neither of which functioned reliably in tissue culture conditions. GATEWAY-compatible plant binary vectors were designed to compare the silencing efficiency of homologous (direct) RNAi vs. heterologous (transitive) RNAi inverted repeats. A set of genes was targeted for post transcriptional silencing in the model Arabidopsis system; these include the floral

  19. Frequency effects in compound production

    NARCIS (Netherlands)

    Bien, H.; Levelt, W.J.M.; Baayen, R.H.

    2005-01-01

    Four experiments investigated the role of frequency information in compound production by independently varying the frequencies of the first and second constituent as well as the frequency of the compound itself. Pairs of Dutch noun-noun compounds were selected such that there was a maximal contrast

  20. Dissecting gamma frequency activity during human memory processing.

    Science.gov (United States)

    Kucewicz, Michal T; Berry, Brent M; Kremen, Vaclav; Brinkmann, Benjamin H; Sperling, Michael R; Jobst, Barbara C; Gross, Robert E; Lega, Bradley; Sheth, Sameer A; Stein, Joel M; Das, Sandthitsu R; Gorniak, Richard; Stead, S Matthew; Rizzuto, Daniel S; Kahana, Michael J; Worrell, Gregory A

    2017-05-01

    Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not clear, however, which processes contribute to human brain gamma frequency activity, or their dynamics and roles during memory processing. Here a large dataset of intracranial recordings obtained during encoding of words from 101 patients was used to detect, characterize and compare induced gamma frequency activity events. Individual bursts of gamma frequency activity were isolated in the time-frequency domain to determine their spectral features, including peak frequency, amplitude, frequency span, and duration. We found two distinct types of gamma frequency activity events that showed either narrowband or broadband frequency spans revealing characteristic spectral properties. Narrowband events, the predominant type, were induced by word presentations following an initial induction of broadband events, which were temporally separated and selectively correlated with evoked response potentials, suggesting that they reflect different neural activities and play different roles during memory encoding. The two gamma frequency activity types were differentially modulated during encoding of subsequently recalled and forgotten words. In conclusion, we found evidence for two distinct activity types induced in the gamma frequency range during cognitive processing. Separating these two gamma frequency activity components contributes to the current understanding of electrophysiological biomarkers, and may prove useful for emerging neurotechnologies targeting, mapping and modulating distinct neurophysiological processes in normal and epileptogenic brain

  1. PT -symmetric spectral singularity and negative-frequency resonance

    Science.gov (United States)

    Pendharker, Sarang; Guo, Yu; Khosravi, Farhad; Jacob, Zubin

    2017-03-01

    Vacuum consists of a bath of balanced and symmetric positive- and negative-frequency fluctuations. Media in relative motion or accelerated observers can break this symmetry and preferentially amplify negative-frequency modes as in quantum Cherenkov radiation and Unruh radiation. Here, we show the existence of a universal negative-frequency-momentum mirror symmetry in the relativistic Lorentzian transformation for electromagnetic waves. We show the connection of our discovered symmetry to parity-time (PT ) symmetry in moving media and the resulting spectral singularity in vacuum fluctuation-related effects. We prove that this spectral singularity can occur in the case of two metallic plates in relative motion interacting through positive- and negative-frequency plasmonic fluctuations (negative-frequency resonance). Our work paves the way for understanding the role of PT -symmetric spectral singularities in amplifying fluctuations and motivates the search for PT symmetry in novel photonic systems.

  2. Interactive tool that empowers structural understanding and enables FEM analysis in a parametric design environment

    DEFF Research Database (Denmark)

    Christensen, Jesper Thøger; Parigi, Dario; Kirkegaard, Poul Henning

    2014-01-01

    This paper introduces an interactive tool developed to integrate structural analysis in the architectural design environment from the early conceptual design stage. The tool improves exchange of data between the design environment of Rhino Grasshopper and the FEM analysis of Autodesk Robot...... of Architecture and Design at Aalborg University...... Structural Analysis. Further the tool provides intuitive setup and visual aids in order to facilitate the process. Enabling students and professionals to quickly analyze and evaluate multiple design variations. The tool has been developed inside the Performance Aided Design course at the Master...

  3. Staying the course: Examining enablers and barriers to student success within undergraduate nursing programmes

    Directory of Open Access Journals (Sweden)

    Victoria Boyd

    2012-01-01

    Full Text Available In line with current trends towards a positive and enhancement-led perspective, this account of a research project carried out in a Scottish university considers the student nurse experience as a lens for examining retention enablers. Two phases of interviews with final year students from a diverse cohort, many of whom were adult learners, informed the development of a series of themes and recommendations for better understanding factors which encourage persistence. A combination of grounded theory thematic analysis and narrative interpretation was used in this research to encourage a rich biographical component.

  4. Superhigh-frequency radiometer with post-detector pulse-duration modulation

    CERN Document Server

    Filatov, A V

    2002-01-01

    Paper describes a superhigh-frequency radiometer with extra pulse-duration modulation of reference signal by low frequency. Pulse-duration modulation is realized due to various coefficients of reference signal sharing in resistive attenuators of a low-frequency unit. Design of radiometer makes use of modification of zero measurement method when automatic control is realized by variation of pulse-duration signal duration. Radiometer switching to zero balance in a low-frequency section enables to use high-frequency units of any modulating radiometer with symmetry modulation

  5. Organizational Enablers for Governance and Governmentality of Projects

    DEFF Research Database (Denmark)

    Müller, Ralf; Pemsel, Sofia; Shao, Jingting

    2014-01-01

    governance, governance of projects and governmentality. Outcomes indicate that governance is enabled through different forms of flexibility at different levels of governance, institutional setup and authority at the project level, flexible structures and mindsets of people at the organizational level......This study identifies the organizational enablers for governance in the realm of projects. We first conceptualize organizational enablers as comprising of process facilitators and discursive abilities, each with its own factors and mechanisms. Then we apply this concept to the literature on project...

  6. A single nano cantilever as a reprogrammable universal logic gate

    Science.gov (United States)

    Chappanda, K. N.; Ilyas, S.; Kazmi, S. N. R.; Holguin-Lerma, J.; Batra, N. M.; Costa, P. M. F. J.; Younis, M. I.

    2017-04-01

    The current transistor-based computing circuits use multiple interconnected transistors to realize a single Boolean logic gate. This leads to higher power requirements and delayed computing. Transistors are not suitable for applications in harsh environments and require complicated thermal management systems due to excessive heat dissipation. Also, transistor circuits lack the ability to dynamically reconfigure their functionality in real time, which is desirable for enhanced computing capability. Further, the miniaturization of transistors to improve computational power is reaching its ultimate physical limits. As a step towards overcoming the limitations of transistor-based computing, here we demonstrate a reprogrammable universal Boolean logic gate based on a nanoelectromechanical cantilever (NC) oscillator. The fundamental XOR, AND, NOR, OR and NOT logic gates are condensed in a single NC, thereby reducing electrical interconnects between devices. The device is dynamically switchable between any logic gates at the same drive frequency without the need for any change in the circuit. It is demonstrated to operate at elevated temperatures minimizing the need for thermal management systems. It has a tunable bandwidth of 5 MHz enabling parallel and dynamically reconfigurable logic device for enhanced computing.

  7. A single nano cantilever as a reprogrammable universal logic gate

    KAUST Repository

    Chappanda, K. N.

    2017-02-24

    The current transistor-based computing circuits use multiple interconnected transistors to realize a single Boolean logic gate. This leads to higher power requirements and delayed computing. Transistors are not suitable for applications in harsh environments and require complicated thermal management systems due to excessive heat dissipation. Also, transistor circuits lack the ability to dynamically reconfigure their functionality in real time, which is desirable for enhanced computing capability. Further, the miniaturization of transistors to improve computational power is reaching its ultimate physical limits. As a step towards overcoming the limitations of transistor-based computing, here we demonstrate a reprogrammable universal Boolean logic gate based on a nanoelectromechanical cantilever (NC) oscillator. The fundamental XOR, AND, NOR, OR and NOT logic gates are condensed in a single NC, thereby reducing electrical interconnects between devices. The device is dynamically switchable between any logic gates at the same drive frequency without the need for any change in the circuit. It is demonstrated to operate at elevated temperatures minimizing the need for thermal management systems. It has a tunable bandwidth of 5 MHz enabling parallel and dynamically reconfigurable logic device for enhanced computing.

  8. Universities as Potential Actors for Sustainable Development

    Directory of Open Access Journals (Sweden)

    Michael von Hauff

    2014-05-01

    Full Text Available Universities can contribute to the solutions of major challenges of the 21st century such as increasing environmental and socio-economic crises, inequalities of income and wealth and political instabilities by integrating the concept of sustainable development (SD in research, organization, and by educating future decision makers. For instance, by integrating sustainability into the organization, universities can lead by example. Furthermore, through the curriculum, future decision makers can learn the competences needed to solve ecological, social, and economic problems in societies. However, despite their possible importance, universities in Germany fall behind internationally in implementing sustainable strategies. Therefore this paper presents/introduces an approach to how universities can implement the holistic concept of SD that considers all three dimensions (economic, ecological, and social relating to their main functions of research and education in addition to their organization. Additionally this paper analyzes the current state of implementing sustainability strategies at universities, and how the success of these implementation efforts can be evaluated and be fostered further. We find that assessment systems enable universities to systematically use their potential for action for SD by initiating, evaluating, and accelerating the sustainability process. This also applies in the case of German universities, where the implementation of SD is still in the early stages.

  9. Global network centrality of university rankings

    Science.gov (United States)

    Guo, Weisi; Del Vecchio, Marco; Pogrebna, Ganna

    2017-10-01

    Universities and higher education institutions form an integral part of the national infrastructure and prestige. As academic research benefits increasingly from international exchange and cooperation, many universities have increased investment in improving and enabling their global connectivity. Yet, the relationship of university performance and its global physical connectedness has not been explored in detail. We conduct, to our knowledge, the first large-scale data-driven analysis into whether there is a correlation between university relative ranking performance and its global connectivity via the air transport network. The results show that local access to global hubs (as measured by air transport network betweenness) strongly and positively correlates with the ranking growth (statistical significance in different models ranges between 5% and 1% level). We also found that the local airport's aggregate flight paths (degree) and capacity (weighted degree) has no effect on university ranking, further showing that global connectivity distance is more important than the capacity of flight connections. We also examined the effect of local city economic development as a confounding variable and no effect was observed suggesting that access to global transportation hubs outweighs economic performance as a determinant of university ranking. The impact of this research is that we have determined the importance of the centrality of global connectivity and, hence, established initial evidence for further exploring potential connections between university ranking and regional investment policies on improving global connectivity.

  10. Universal deformation formulas

    OpenAIRE

    Remm, E.; Markl, M.

    2015-01-01

    We give a conceptual explanation of universal deformation formulas for unital associative algebras and prove some results on the structure of their moduli spaces. We then generalize universal deformation formulas to other types of algebras and their diagrams.

  11. Suicide Among University Students

    Science.gov (United States)

    Sims, Lily; Ball, Michael J.

    1973-01-01

    A detailed study of university and provincial records was undertaken to determine whether or not the low rates of suicide at the University of Alberta might have resulted from incomplete reporting. (Authors/CB)

  12. Metaphor and Universal Language.

    Science.gov (United States)

    Blown, Eric; And Others

    1990-01-01

    Attempts to identify elements of universal language and probes the limitations of the communication metaphor. Universal language is discussed in terms of the theory of quantum nonlocality and the implications of this theory for communication with extraterrestrial beings. (PCB)

  13. The Ohio State University.

    Science.gov (United States)

    CAUSE/EFFECT, 1978

    1978-01-01

    The three computer service facilities at Ohio State University in Columbus are described. Computer services are provided for: instructional purposes, public service activities, university management, the hospital information system, and student services. (BH)

  14. The Worldhood university

    DEFF Research Database (Denmark)

    Bengtsen, Søren Smedegaard; Nørgård, Rikke Toft

    now approach the mode 3 university, which is a university for, in, and of the world. However, new difficulties and challenges also become visible when moving into the mode 3 worldhood university. As we have argued elsewhere making the university belong to the world, and vice-versa, is a challenge...... and society risks breaking down, when the purpose of the university is no longer clear to the public, and indeed this becomes further complicated when the notion of the public itself becomes confused. Hereby we risk that the dialogue between the university and the public – their thinking together – breaks...... as an enclosed world is, as Barnett points out, that it may become ideological as well, where “[t]he university is unable to think imaginatively about itself, beyond its contemporary self-understandings.”, whereby our reflections on the future university needs to include a “counter-ideology thinking.” (Barnett...

  15. The Alien University

    DEFF Research Database (Denmark)

    Bengtsen, Søren Smedegaard

    2018-01-01

    - they are alien. The conditions of universities today is not one of crisis and upheaval, as with the postmodern universities, it is one of night travel and exile. The alien university leaves behind the epistemological skirmishes of the postmodern university with all its rhetoric and knowledge activism. Thinking...... in the alien university is a move into a whirlpool of nothingness, a “nocturnal space”, where “[d]arkness fills it like a content; it is full, but full of the nothingness of everything.” (Levinas, 2001, p.53). In the alien university thinking is not situated, and instead of rhizomes, and assemblages of thought......, there is merely an imposing and nightly “swarming of points.” (ibid.). There is no place for the alien university, and exactly this exile of thought makes possible the move beyond postmodernism and the mentality of political crisis. The alien university is not in the future as such, but it is not entirely...

  16. Universities metaranking. Positioning of the Spanish universities

    Directory of Open Access Journals (Sweden)

    Teodoro Luque-Martínez

    2018-02-01

    Full Text Available This study proposes the elaboration of a meta-ranking, including the 14 Spanish universities which appear in at least four of the five global rankings considered in this study, that are some of the world’s most influential. It is necessary to differentiate between research rakings that use bibliometric data and rankings that take into account other aspects and other forms of data collection, basically based on surveys. Spanish universities attain better positions in the first group. The investigation highlighted that the higher weaknesses we can find are in the internationalization, the reputation or in the student-teacher ratio. The one exception is for universities that stand out in the two dimensions. Regarding the outcome, there is an evident need for a greater internationalisation, to improve the reputation of the higher education institutions and to enhance the international visibility of the Spanish universities.

  17. Temporal mode selectivity by frequency conversion in second-order nonlinear optical waveguides

    DEFF Research Database (Denmark)

    Reddy, D. V.; Raymer, M. G.; McKinstrie, C. J.

    2013-01-01

    in a transparent optical network using temporally orthogonal waveforms to encode different channels. We model the process using coupled-mode equations appropriate for wave mixing in a uniform second-order nonlinear optical medium pumped by a strong laser pulse. We find Green functions describing the process......We explore theoretically the feasibility of using frequency conversion by sum- or difference-frequency generation, enabled by three-wave-mixing, for selectively multiplexing orthogonal input waveforms that overlap in time and frequency. Such a process would enable a drop device for use...

  18. Energy based correlation criteria in the mid-frequency range

    Science.gov (United States)

    Biedermann, J.; Winter, R.; Wandel, M.; Böswald, M.

    2017-07-01

    Aircraft structures are characterized by their lightweight design. As such, they are prone to vibrations. Numerical models based on the Finite Element Method often show significant deviations when the mid-frequency range is considered, where strong interaction between vibrations and acoustics is present. Model validation based on experimental modal data is often not possible due to the high modal density that aircraft fuselage structures exhibit in this frequency range. Classical correlation criteria like the Modal Assurance Criterion require mode shapes and can therefore not be applied. Other correlation criteria using frequency response data, such as the Frequency Domain Assurance Criterion, are highly sensitive to even small structural modifications and fail to indicated the correlation between test and analysis data in the mid-frequency range. Nevertheless, validated numerical models for the mid- to high-frequency ranges are a prerequisite for acoustic comfort predictions of aircraft cabin. This paper presents a new method for the correlation of response data from test and analysis in the mid-frequency range to support model validation in the mid-frequency range and to enable the usage of finite element models in this frequency range. The method is validated on a stiffened cylindrical shell structure, which represents a scale-model of an aircraft fuselage. The correlation criterion presented here is inspired by Statistical Energy Analysis and is based on kinetic energies integrated over frequency bands and spatially integrated over surface areas of the structure. The objective is to indicate frequency bands where the finite element model needs to be adjusted to better match with experimental observations and to locate the areas where these adjustments should be applied.

  19. The use of low frequency AC for offshore wind power

    Energy Technology Data Exchange (ETDEWEB)

    Schuette, T.; Stroem, M.; Gustavsson, Bo [Balfour Beatty Rail AB, Vaesteraas (Sweden)

    2001-07-01

    Low frequency AC, that means AC with a frequency well below the usual frequencies 50 or 60 Hz, has today its main use in single phase AC electrified railways in a number of European countries (16 2/3 Hz), USA (25 Hz) and Costa Rica (20 Hz). Offshore wind power is well suited to 'join the club' as low frequency AC has a number of advantages for that use: Low frequency AC better fits the low revolution frequency of wind power rotors. This can either be used for reduction of pole number for direct generation machines or for a reduction of the gear ratio for conventional machines, resulting in simpler, lighter and more reliable gearboxes. Low frequency AC gives rise to lower charging current/reactive power production, which restricts the maximum cable length for 50 - 60 Hz heavily due to the high specific capacitance of power cables. For low frequency AC, cables longer than 100 km are possible, which is necessary for many future offshore wind power sites. Low frequency AC enables for the use of (air insulated) transmission lines at loads well above their characteristic power, often up to their thermal maximum load. This means that weak 50 or 60 Hz lines between the shore and consumers or stronger parts of a national grid can transfer more power when operated with low frequency AC. On all aspects of low frequency AC, profound knowledge has been accumulated the last century in the railway sector and can be made available for wind power.

  20. Gambling with the Universe

    Science.gov (United States)

    Hawking, Stephen

    2002-05-01

    This is an excerpt from Stephen Hawking's book The Universe in a Nutshell. Roger Penrose and Stephen Hawking, Lucasian Professor of Mathematics at the University of Cambridge, were able to show that Einstein's General Theory of Relativity implied that the universe and time itself must have had a beginning in a tremendous explosion. The discovery of the expansion of the universe is one of the great intellectual revolutions of the twentieth century.