Relevant bibliographies by topics / RFF

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'RFF'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "RFF"

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Lien, Yu-An S., Carolyn R. Calabrese, Carolyn M. Michener, Elizabeth Heller Murray, Jarrad H. Van Stan, Daryush D. Mehta, Robert E. Hillman, J. Pieter Noordzij, and Cara E. Stepp. "Voice Relative Fundamental Frequency Via Neck-Skin Acceleration in Individuals With Voice Disorders." Journal of Speech, Language, and Hearing Research 58, no. 5 (October 2015): 1482–87. http://dx.doi.org/10.1044/2015_jslhr-s-15-0126.

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Purpose This study investigated the use of neck-skin acceleration for relative fundamental frequency (RFF) analysis. Method Forty individuals with voice disorders associated with vocal hyperfunction and 20 age- and sex-matched control participants were recorded with a subglottal neck-surface accelerometer and a microphone while producing speech stimuli appropriate for RFF. Rater reliabilities, RFF means, and RFF standard deviations derived from the accelerometer were compared with those derived from the microphone. Results RFF estimated from the accelerometer had slightly higher intrarater reliability and identical interrater reliability compared with values estimated with the microphone. Although sensor type and the Vocal Cycle × Sensor and Vocal Cycle × Sensor × Group interactions showed significant effects on RFF means, the typical RFF pattern could be derived from either sensor. For both sensors, the RFF of individuals with vocal hyperfunction was lower than that of the controls. Sensor type and its interactions did not have significant effects on RFF standard deviations. Conclusions RFF can be reliably estimated using an accelerometer, but these values cannot be compared with those collected via microphone. Future studies are needed to determine the physiological basis of RFF and examine the effect of sensors on RFF in practical voice assessment and monitoring settings.
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Puckett, Susan E., Kaleb A. Reese, Georgi M. Mitev, Valerie Mullen, Rudd C. Johnson, Kyle R. Pomraning, Brett L. Mellbye, et al. "Bacterial Resistance to Antisense Peptide Phosphorodiamidate Morpholino Oligomers." Antimicrobial Agents and Chemotherapy 56, no. 12 (September 17, 2012): 6147–53. http://dx.doi.org/10.1128/aac.00850-12.

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ABSTRACTPeptide phosphorodiamidate morpholino oligomers (PPMOs) are synthetic DNA mimics that bind cRNA and inhibit bacterial gene expression. The PPMO (RFF)3RXB-AcpP (where R is arginine, F, phenylalanine, X is 6-aminohexanoic acid, B is β-alanine, and AcpP is acyl carrier protein) is complementary to 11 bases of the essential geneacpP(which encodes acyl carrier protein). The MIC of (RFF)3RXB-AcpP was 2.5 μM (14 μg/ml) inEscherichia coliW3110. The rate of spontaneous resistance ofE. colito (RFF)3RXB-AcpP was 4 × 10−7mutations/cell division. A spontaneous (RFF)3RXB-AcpP-resistant mutant (PR200.1) was isolated. The MIC of (RFF)3RXB-AcpP was 40 μM (224 μg/ml) for PR200.1. The MICs of standard antibiotics for PR200.1 and W3110 were identical. The sequence ofacpPwas identical in PR200.1 and W3110. PR200.1 was also resistant to other PPMOs conjugated to (RFF)3RXB or peptides with a similar composition or pattern of cationic and nonpolar residues. Genomic sequencing of PR200.1 identified a mutation insbmA, which encodes an active transport protein. In separate experiments, a (RFF)3RXB-AcpP-resistant isolate (RR3) was selected from a transposome library, and the insertion was mapped tosbmA. Genetic complementation of PR200.1 or RR3 withsbmArestored susceptibility to (RFF)3RXB-AcpP. Deletion ofsbmAcaused resistance to (RFF)3RXB-AcpP. We conclude that resistance to (RFF)3RXB-AcpP was linked to the peptide and not the phosphorodiamidate morpholino oligomer, dependent on the composition or repeating pattern of amino acids, and caused by mutations insbmA. The data further suggest that (RFF)3R-XB PPMOs may be transported across the plasma membrane by SbmA.
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Dahl, Kimberly L., and Cara E. Stepp. "Changes in Relative Fundamental Frequency Under Increased Cognitive Load in Individuals With Healthy Voices." Journal of Speech, Language, and Hearing Research 64, no. 4 (April 14, 2021): 1189–96. http://dx.doi.org/10.1044/2021_jslhr-20-00134.

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Purpose The purpose of this study was to determine the effect of cognitive load on relative fundamental frequency (RFF) in individuals with healthy voices. Method Twenty adults with healthy voices read sentences under different cognitive load conditions. Each sentence contained color terms printed in colored ink, creating an embedded Stroop task. Participants read the ink color in which a word was printed, rather than the color term itself. Sentences with mismatched ink colors and printed words constituted an increased cognitive load. RFF, an acoustic correlate of laryngeal tension, was calculated for the 10 voicing cycles preceding (i.e., offset) and following (i.e., onset) voiceless consonants. Repeated measures analyses of variance were constructed to assess the effects of RFF cycle, cognitive load, and their interaction on mean RFF offset and onset. Results There was a significant effect of cognitive load condition on RFF offset. There was no significant effect of condition on RFF onset nor significant interaction between cycle and condition on RFF onset or offset values. Conclusion Reduced mean RFF offset may indicate an increase in laryngeal muscle tension during a cognitively demanding task.
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Roy, Nelson, Rebecca A. Fetrow, Ray M. Merrill, and Christopher Dromey. "Exploring the Clinical Utility of Relative Fundamental Frequency as an Objective Measure of Vocal Hyperfunction." Journal of Speech, Language, and Hearing Research 59, no. 5 (October 2016): 1002–17. http://dx.doi.org/10.1044/2016_jslhr-s-15-0354.

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Purpose Vocal hyperfunction, related to abnormal laryngeal muscle activity, is considered the proximal cause of primary muscle tension dysphonia (pMTD). Relative fundamental frequency (RFF) has been proposed as an objective acoustic marker of vocal hyperfunction. This study examined (a) the ability of RFF to track changes in vocal hyperfunction after treatment for pMTD and (b) the influence of dysphonia severity, among other factors, on the feasibility of RFF computation. Method RFF calculations and dysphonia severity ratings were derived from pre- and posttreatment recordings from 111 women with pMTD and 20 healthy controls. Three vowel–voiceless consonant–vowel stimuli were analyzed. Results RFF onset slope consistently varied as a function of group (pMTD vs. controls) and time (pretherapy vs. posttherapy). Significant correlations between RFF onset cycle 1 and dysphonia severity were observed. However, in many samples, RFF could not be computed, and adjusted odds ratios revealed that these unanalyzable data were linked to dysphonia severity, phonetic (vowel–voiceless consonant–vowel) context, and group (pMTD vs. control). Conclusions RFF onset appears to be sensitive to the presence and degree of suspected vocal hyperfunction before and after therapy. The large number of unanalyzable samples (related especially to dysphonia severity in the pMTD group) represents an important limitation.
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Heller Murray, Elizabeth S., Roxanne K. Segina, Geralyn Harvey Woodnorth, and Cara E. Stepp. "Relative Fundamental Frequency in Children With and Without Vocal Fold Nodules." Journal of Speech, Language, and Hearing Research 63, no. 2 (February 26, 2020): 361–71. http://dx.doi.org/10.1044/2019_jslhr-19-00058.

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Purpose Relative fundamental frequency (RFF) is an acoustic measure that is sensitive to functional voice differences in adults. The aim of the current study was to evaluate RFF in children, as there are known structural and functional differences between the pediatric and adult vocal mechanisms. Method RFF was analyzed in 28 children with vocal fold nodules (CwVN, M = 9.0 years) and 28 children with typical voices (CwTV, M = 8.9 years). RFF is the instantaneous fundamental frequency ( f 0 ) of the 10 vocalic cycles during devoicing (vocal offset) and 10 vocalic cycles during the revoicing (vocal onset) of the vowels that surround a voiceless consonant. Each cycle's f 0 was normalized to a steady-state portion of the vowel. RFF values for the cycles closest to the voiceless consonant, that is, Offset Cycle 10 and Onset Cycle 1, were examined. Results Average RFF values for Offset Cycle 10 and Onset Cycle 1 did not differ between CwVN and CwTV; however, within-subject variability of Offset Cycle 10 was decreased in CwVN. Across both groups, male children had lower Offset Cycle 10 RFF values as compared to female children. Additionally, Onset Cycle 1 values were decreased in younger children as compared to those of older children. Conclusions Unlike previous work with adults, CwVN did not have significantly different RFF values than CwTV. Younger children had lower RFF values for Onset Cycle 1 than older children, suggesting that vocal onset f 0 may provide information on the maturity of the laryngeal motor system.
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Wang, Wenbo, Ignacio Aguilar Sanchez, Gianluca Caparra, Andy McKeown, Tim Whitworth, and Elena Simona Lohan. "A Survey of Spoofer Detection Techniques via Radio Frequency Fingerprinting with Focus on the GNSS Pre-Correlation Sampled Data." Sensors 21, no. 9 (April 25, 2021): 3012. http://dx.doi.org/10.3390/s21093012.

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Radio frequency fingerprinting (RFF) methods are becoming more and more popular in the context of identifying genuine transmitters and distinguishing them from malicious or non-authorized transmitters, such as spoofers and jammers. RFF approaches have been studied to a moderate-to-great extent in the context of non-GNSS transmitters, such as WiFi, IoT, or cellular transmitters, but they have not yet been addressed much in the context of GNSS transmitters. In addition, the few RFF-related works in GNSS context are based on post-correlation or navigation data and no author has yet addressed the RFF problem in GNSS with pre-correlation data. Moreover, RFF methods in any of the three domains (pre-correlation, post-correlation, or navigation) are still hard to be found in the context of GNSS. The goal of this paper was two-fold: first, to provide a comprehensive survey of the RFF methods applicable in the GNSS context; and secondly, to propose a novel RFF methodology for spoofing detection, with a focus on GNSS pre-correlation data, but also applicable in a wider context. In order to support our proposed methodology, we qualitatively investigated the capability of different methods to be used in the context of pre-correlation sampled GNSS data, and we present a simulation-based example, under ideal noise conditions, of how the feature down selection can be done. We are also pointing out which of the transmitter features are likely to play the biggest roles in the RFF in GNSS, and which features are likely to fail in helping RFF-based spoofing detection.
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Park, Yeonggwang, and Cara E. Stepp. "Test–Retest Reliability of Relative Fundamental Frequency and Conventional Acoustic, Aerodynamic, and Perceptual Measures in Individuals With Healthy Voices." Journal of Speech, Language, and Hearing Research 62, no. 6 (June 19, 2019): 1707–18. http://dx.doi.org/10.1044/2019_jslhr-s-18-0507.

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Purpose Recent studies have shown that an acoustic measure, relative fundamental frequency (RFF), has potential for the assessment of excessive laryngeal tension and vocal effort associated with functional and neurological voice disorders. This study presents an analysis of the test–retest reliability of RFF in individuals with healthy voices and a comparison of reliability between RFF and conventional measures of voice. Method Acoustic and aerodynamic measurements and Consensus Auditory–Perceptual Evaluation of Voice (CAPE-V) were performed on 28 individuals with healthy voices on 5 consecutive days. Participants produced RFF stimuli, a sustained /ɑ/, and a reading passage to allow for extraction of acoustic measures and CAPE-V ratings; /pa/ trains were produced to allow for extraction of aerodynamic measures. Results Moderate reliabilities (intraclass correlation coefficient [ICC] = .64–.71) were found for RFF values. Mean vocal fundamental frequency, smoothed cepstral peak prominence, shimmer, harmonics-to-noise ratio, and mean airflow rate exhibited good-to-excellent reliabilities (ICC = .76–.99). ICCs for jitter and phonation threshold pressure were moderately reliable (ICC = .67–.74). ICCs for subglottal pressure estimates and all CAPE-V parameters showed poor reliabilities (ICC = .31–.58). Conclusion RFF has comparable reliability to conventional measures of voice. This expands the potential for clinical application of RFF. Supplemental Material https://doi.org/10.23641/asha.8233376
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Vojtech, Jennifer M., Dante D. Cilento, Austin T. Luong, Jacob P. Noordzij, Manuel Diaz-Cadiz, Matti D. Groll, Daniel P. Buckley, Victoria S. McKenna, J. Pieter Noordzij, and Cara E. Stepp. "Acoustic Identification of the Voicing Boundary during Intervocalic Offsets and Onsets Based on Vocal Fold Vibratory Measures." Applied Sciences 11, no. 9 (April 23, 2021): 3816. http://dx.doi.org/10.3390/app11093816.

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Methods for automating relative fundamental frequency (RFF)—an acoustic estimate of laryngeal tension—rely on manual identification of voiced/unvoiced boundaries from acoustic signals. This study determined the effect of incorporating features derived from vocal fold vibratory transitions for acoustic boundary detection. Simultaneous microphone and flexible nasendoscope recordings were collected from adults with typical voices (N = 69) and with voices characterized by excessive laryngeal tension (N = 53) producing voiced–unvoiced–voiced utterances. Acoustic features that coincided with vocal fold vibratory transitions were identified and incorporated into an automated RFF algorithm (“aRFF-APH”). Voiced/unvoiced boundary detection accuracy was compared between the aRFF-APH algorithm, a recently published version of the automated RFF algorithm (“aRFF-AP”), and gold-standard, manual RFF estimation. Chi-square tests were performed to characterize differences in boundary cycle identification accuracy among the three RFF estimation methods. Voiced/unvoiced boundary detection accuracy significantly differed by RFF estimation method for voicing offsets and onsets. Of 7721 productions, 76.0% of boundaries were accurately identified via the aRFF-APH algorithm, compared to 70.3% with the aRFF-AP algorithm and 20.4% with manual estimation. Incorporating acoustic features that corresponded with voiced/unvoiced boundaries led to improvements in boundary detection accuracy that surpassed the gold-standard method for calculating RFF.
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Park, Yeonggwang, Manuel Díaz Cádiz, Kathleen F. Nagle, and Cara E. Stepp. "Perceptual and Acoustic Assessment of Strain Using Synthetically Modified Voice Samples." Journal of Speech, Language, and Hearing Research 63, no. 12 (December 14, 2020): 3897–908. http://dx.doi.org/10.1044/2020_jslhr-20-00294.

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Purpose Assessment of strained voice quality is difficult due to the weak reliability of auditory-perceptual evaluation and lack of strong acoustic correlates. This study evaluated the contributions of relative fundamental frequency (RFF) and mid-to-high frequency noise to the perception of strain. Method Stimuli were created using recordings of speakers producing /ifi/ with a comfortable voice and with maximum vocal effort. RFF values of the comfortable voice samples were synthetically lowered, and RFF values of the maximum vocal effort samples were synthetically raised. Mid-to-high frequency noise was added to the samples. Twenty listeners rated strain in a visual sort-and-rate task. The effects of RFF modification and added noise on strain were assessed using an analysis of variance; intra- and interrater reliability were compared with and without noise. Results Lowering RFF in the comfortable voice samples increased their perceived strain, whereas raising RFF in the maximum vocal effort samples decreased their strain. Adding noise increased strain and decreased intra- and interrater reliability relative to samples without added noise. Conclusions Both RFF and mid-to-high frequency noise contribute to the perception of strain. The presence of dysphonia may decrease the reliability of auditory-perceptual evaluation of strain, which supports the need for complementary objective assessments. Supplemental Material https://doi.org/10.23641/asha.13172252
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Lien, Yu-An S., Caitlin I. Gattuccio, and Cara E. Stepp. "Effects of Phonetic Context on Relative Fundamental Frequency." Journal of Speech, Language, and Hearing Research 57, no. 4 (August 2014): 1259–67. http://dx.doi.org/10.1044/2014_jslhr-s-13-0158.

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Purpose The effect of phonetic context on relative fundamental frequency (RFF) was examined, in order to develop stimuli sets with minimal within-speaker variability that can be implemented in future clinical protocols. Method Sixteen speakers with healthy voices produced RFF stimuli. Uniform utterances consisted of 3 repetitions of the same voiced sonorant-voiceless consonant-voiced sonorant speech sequence; moderately variable sentences contained speech sequences with a single voiceless phoneme (/f/, /s/, /ʃ/, /p/, /t/, or /k/); highly variable sentences were loaded with speech sequences using multiple phonemes. Effects of stimulus type (uniform, moderately variable, and highly variable) and phoneme identity (/f/, /s/, /ʃ/, /p/, /t/, and /k/) on RFF means and standard deviations were determined. Results Stimulus type and the interaction of vocal cycle and stimulus type were significant for RFF means and standard deviations but with small effect sizes. Phoneme identity and the interaction of vocal cycle and phoneme identity on RFF means and standard deviations were also significant with small to medium effect sizes. Conclusions For speakers with healthy voices, uniform utterances with /f/ and /ʃ/ have the lowest standard deviations and thus are recommended for RFF-based assessments. Future work is necessary to extend these findings to disordered voices.
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Dissertations / Theses on the topic "RFF"

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Stephanie-victoire, Noémie. "Les marchés de la SNCF depuis la création de RFF." Paris 13, 2000. http://www.theses.fr/2000PA131039.

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Ladirective 93/38/CEE du conseil du 14 juin 1993 impose la mise en concurrence et la publicité aux marchés conclus dans les secteurs de l'eau, de l'energie, des transports et des télécommunications afin de mettre en eouvre des pratiques commerciales loyales. Cependant, les entreprises qui exploitent ces secteurs, ont la possibilité de choisir entre les différentes procédures de passation des marchés (ouvertes, restreintes ou négociées). Cette fléxibilité est appliquée par la Société Nationale des Chemins de Fer Français (SNCF). Exclue du champs d'application du code des marchés publics, cet établissement public industriel et commercial a crée son propre cadre juridique composé de cahiers de clauses et de conditions générales, justifié par la particularité de ses marchés. Ainsi, dans le domaone ferroviaire, l'exploitant du service de transport de voyageurs et de marchandises ainsi que la gestion des infrastructures ferroviaires exigent des compétences spécifiques de la part des entrepreneurs, des fournisseurs et des prestataires de services. Cette spécificité limite le nombre d'entreprises soumissionnaire. La création du Réseau Ferré de France (RFF) par la loi du 13 février 1997 complique le régime juridique applicable aux marchés de la SNCF. En effet, en application de la directive 91/440/CEE du conseil du 29 juillet 1991, relative au développement des chemeins de fer communautaires, la création de RFF répond aux besoins d'assurer un désendettement de la SNCF et de séparer la gestion de l'infrastructure et l'exploitation du service de transport ferroviaire. Par conséquent, cette loi du 13 février 1997 prévoit une nouvelle répartition des compétences entre la SNCF et RFF qui a plusieurs conséquences sur les procédues de passation des marchés conclus dans le domaine ferroviaire. Dans le domaine de la gestion de l'infrastructure ferroviaire, RFF est maître d'ouvrage des nouveaux investissements et confie à la SNCF un mandat de maîtrise d'ouvrage pour des ensembles d'opérations. Cet établissement public industriel et commercial attribue les marchés alors que les procédures de passation et de sélection des entreprises soumissionnaires sont menées par la SNCF. Dans le domaine de l'exploitation du service de transport, la SNCF conserve son ancien cadre juridique.
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Lovett, Victoria Anne. "Voice Features of Sjogren's Syndrome: Examination of Relative Fundamental Frequency (RFF) During Connected Speech." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5749.

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The purpose of this study was to examine the effectiveness of relative fundamental frequency (RFF) in quantifying voice disorder severity and possible change with treatment in individuals with Primary Sjögren's Syndrome (SS). Participants completed twice-daily audio recordings during an ABAB within-subjects experimental study investigating the effects of nebulized saline on voice production in this population. Voice samples of the Rainbow Passage from seven of the eight individuals with Primary SS involved in a larger investigation met inclusion criteria for analysis, for a total of 555 tokens. The results indicated that RFF values for this sample were similar to previously reported RFF values for individuals with voice disorders. RFF values improved with nebulized saline treatment but did not fall within the normal range for typical speakers. These findings were similar to other populations of voice disorders who experienced improvement, but not complete normalization, of RFF with treatment. Patient-based factors, such as age and diagnosis as well as measurement and methodological factors, might affect RFF values. The results from this study indicate that RFF is a potentially useful measure in quantifying voice production and disorder severity in individuals with Primary SS.
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Chraibi, Sarrah. "Faire ou faire-faire les Achats : le modèle de RFF et de SNCF Réseau à l’épreuve des faits." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIL443.

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L’externalisation peut s’avérer une épée à double tranchant : face aux opportunités qu’elle présente, les dangers qu’elle engendre, s’ils ne sont pas suffisamment maitrisés, peuvent aller jusqu’à menacer la pérennité de l’entreprise. L'externalisation des Achats à caractère stratégique est de son côté assez émergente et nécessite donc la mise en place d’une nouvelle méthode organisationnelle dans les pratiques de l’entreprise. Cette recherche démontre qu’un modèle de management mixte (vertical et horizontal) peut s’avérer efficace pour l’externalisation des Achats à caractère stratégique et s’intéresse ensuite à tous les Achats de l’entreprise en développant un modèle d’aide à la décision du faire ou faire-faire des Achats. La méthodologie suivie est qualitative se basant sur une étude de cas approfondie et des entretiens d’experts
A great deal of attention has been paid to the performance of business networks in supply chain management, firms are collaborating more to develop long term business relationships. However, limited empirical evidence exists to validate a plural management model as a key success factor in a strategic supplier relationship. The purpose of this research is to enrich our understanding about how to manage an external provider relationship in case of outsourcing strategic procurement by providing empirical evidence. Then this research draws a decision making process for the Make-or-Buy of procurement activities which includes: Analysis of the current situation, Preparation for the Make-or-Buy choice, Scope of Make-or-Buy, Make-or-Buy analysis and Make-or-Buy choice. This research examines an in-depth qualitative case and contributes to the literature by providing empirical evidence
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Barradas, Pedro Jorge Rodrigues. "Um sistema de controlo de gestão automatizado como forma de obter maior qualidade, eficiência e eficácia na gestão dos recursos financeiros." Master's thesis, Instituto Superior de Ciências Sociais e Políticas, 2013. http://hdl.handle.net/10400.5/5182.

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Trabalho de Projeto para obtenção de grau de Mestre em MPA – Administração Pública
Trabalho no Gabinete de Gestão Financeira do Ministério da Educação desde 2006, na Direção de Serviços de Sistemas de Informação, desempenhando funções nas áreas do desenvolvimento e gestão de Bases de Dados. Ao longo destes anos, tem-se verificado uma sobrecarga crescente de informação, que tem vindo a originar vários problemas, nomeadamente: a) existência de muita informação para o mesmo facto; b) existência de soluções não integradas que impossibilita a partilha da informação; c) dificuldade em saber que informação está correta; d) dificuldade em saber onde se encontra a informação correta; e) existência de trabalho repetitivo e redundante no tratamento da informação; f) a utilização massiva do suporte papel em detrimento do formato digital; g) enorme esforço de compatibilização das informações que apresentam infraestruturas de base diferentes; h) decisor confronta-se com muita informação sobre o mesmo assunto. O desafio que abraçamos com este trabalho de investigação foi o de apontar e sugerir aspetos que devem ser observados pelo GGF para “adapta-lo” aos modernos conceitos de gestão. Concluímos que a adoção de “políticas” que fomentem a centralização da informação por um lado, a desmaterialização por outro lado, e a racionalização de outros serviços potencializados pelas TIC, corresponderá a uma possível solução.
Since 2006 I’ve been working for the Ministry of Education, at the Financial Administration Department at Direção de Serviços de Sistemas de Informação, in development and Database administration. During all these years an overloaded increasing of information has been being recognized, causing some problems, such as: a)the existence of lots of information about the same fact; b)the existence of non-integrated solutions which make it impossible to share information; c)difficulty in recognizing the right information; d)difficulty in recognizing where the right information is; e)the existence of a repeated and redundant work in the information’s treatment; f)a wasteful use of paper support instead of the use of the digital form; g)a hard effort to make compatible information coming from different bases; h)the one who most decide is confronted by too much information at the same time. With this work we intended to focus on aspects that must be carefully observed by GGF in order to adapt it to the modern concepts of management. We inferred that the use of polities that, on the one hand increase the information centralization and, on the other hand provide its dematerialization and, yet, the rationalization of other services empowered by CIT, can be a possible solution.
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Smith, Travis R. "Comparing RF Fingerprinting Performance of Hobbyist and Commercial-Grade SDRs." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1608139109925131.

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Signé, Elisabeth. "Réactivité radicalaire de RFI, RFH et RFC2H4I : application à la synthèse." Montpellier 2, 1992. http://www.theses.fr/1992MON20253.

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Un chapitre bibliographique situe la reactivite radicalaire des composes r#fi, r#fh et r#fch#2ch#2i (r#f: c#nf#2#n#+#1 lineaire, n = 2,4,6,8). Il est ensuite decrit la synthese originale de r#fbr et r#fcl a partir de r#fi et r#fh mis en presence a 160 et 300c d'agents bromants et chlorants notamment cbr#4 et ccl#4 (chapitre 2). Enfin, une synthese amelioree de r#fch#2ch#2oh a pu etre effectuee par reaction de r#fch#2ch#2i avec des amides en presence d'initiateurs radicalaires (etudes cinetiques aspects mecanistique) (chapitre 3)
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Castilho, Sara Isabel Pereira. "Estudo da frequência fundamental relativa na tensão laríngea." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13589.

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Mestrado em Ciências da Fala e da Audição
Neste estudo analisou-se o comportamento da frequência fundamental relativa (RFF) em indivíduos com nódulos vocais (N=9), com Edema de Reinke (N=15) e sem patologia vocal ( N=24), procurando perceber a relação entre este parâmetro e a tensão laríngea. Selecionaram-se dez sequências do tipo VCV do texto foneticamente equilibrado “O Vento Norte e o Sol”. Destas sequências extraíram-se os valores de RFF. Ainda no texto, numa das vogais selecionadas, extraíram-se os parâmetros F0, Jitter, Shimmer e HNR. Estes parâmetros foram também calculados a partir de uma vogal sustentada. Para avaliar a tensão, recorreu-se à avaliação percetiva, pela escala GRBAS.Com os valores de RFF dos informantes dos diferentes grupos aplicou-se uma ANOVA onde não se encontraram diferenças significativas para o fator diagnóstico e encontraram-se diferenças no fator ciclos. Os valores de RFF obtidos dentro de cada grupo apresentam uma grande dispersão. Estudou-se também a correlação entre o RFF e a tensão medida percetivamente mas os resultados não foram estatisticamente significativos. Analisaram-se também os parâmetros de tensão, F0, Jitter, Shimmer e HNR e encontraram-se diferenças entre os grupos com a tensão, a F0 e o HNR. Neste estudo não foi possível estabelecer uma relação clara entre o RFF e a tensão laríngea, sendo esta medida de difícil aplicabilidade clínica.
In this study the behaviour of the relative fundamental frequency (RFF) in healthy speakers (N=24) and speakers with voice disorders (vocal fold nodules N=9; Reinke’s edema N=15), and the relation between this measure and laryngeal tension, were analysed. Ten phonetic VCV sequencies from the phonetically balance text ”The North Wind and the Sun” were selected, to calculate RFF measures. In the same text, in one selected vowel, and in one sustained vowel, the following acoustic measures were extracted: F0, Jitter, Shimmer and HNR. Strain was also perceptually assessed with the GRBAS scale. An ANOVA of RFF values from the different groups, was used but no statistically significant differences between the three groups were found. However there were statistical differences between the cycles. The RFF values within each group were widely dispersed. There was no correlation between RFF and strain. Fundamental frequency (F0), Jitter, Shimmer and HNR values were also analysed, and results revealed that there were differences between strain, F0 and HNR. In this study we could conclude that it was not possible to establish a correlation between RFF and laryngeal tension, and that it is hard to see the aplicability of the RFF measure in a clinical context.
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Costa, Rejane. "RGF." Florianópolis, SC, 2001. http://repositorio.ufsc.br/xmlui/handle/123456789/79713.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.
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Sabemos que as crianças sentem-se motivadas a estudar com o auxílio de recursos computacionais. Com o surgimento das novas tecnologias podemos destacar a mais inovadora delas, a Hipermídia, com um grande poder de aplicabilidade na Educação.
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Wu, Lingling. "Surface processing by RFI PECVD and RFI PSII." W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539623997.

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An RFI plasma enhanced chemical vapor deposition (PECVD) system and a large-scale RF plasma source immersion ion implantation (PSII) system were designed and built to study two forms of 3-D surface processing, PECVD and PSII. Using the RFI PECVD system, Ti-6Al-4V substrates were coated with diamond-like carbon films with excellent tribological and optical properties. as an innovation, variable angle spectroscopic ellipsometry (VASE) was successfully applied for non-destructive, 3-D, large-area tribological coatings quality investigation.;Based on the experience with the RFI PECVD system, a large-scale RFICP source was designed and built for the PSIL Langmuir probe and optical emission spectroscopy studies indicated that the RFI source produced stable, uniform, and clean plasma. MAGIC code was for the first time used to model PSII process, addressing different target geometries and boundaries, materials, plasma parameters, illustrated sheath formation and evolution, field distribution, ion and electron trajectories, ion incident angles, and dose distributions, which are critical for PSII design and understanding.;The RF PSII system was developed into a versatile large-area, uniform, 3-D surface processing apparatus, capable of PSII, PVD, PECVD, and in situ surface cleaning and interface properties modification, for multilayer, multi-step, and high performance surface engineering. Using the RFI PSII system, for the first time, PSII was studied as a mask-based surface layer conversion technique, for pattern writing by implantation as an alternative to current deposition-based and ink-based direct write technologies. It operates at low substrate temperature, keeps the original surface finish and dimensions, and avoids adhesion problem. A different operating mode of the RF source was discovered to perform biased sputtering of high purity quartz, which turned the RFI PSII system into a novel integrated RF PSII/PVD system for large-area, uniform, nitrogen-doped, and hydrogen-free SiO2 films deposition at low substrate temperatures. Nitrogen-doped SiO2 films with excellent optical properties were deposited on semiconductor, metal, and polymer substrates with excellent adhesion. Ellipsometry was used again for non-destructive SiO2 coatings investigation. FEL test electrodes processed by PSII/PVD showed suppressed field emission. A group of transition metals and an FEL test electrode were also implanted by nitrogen using the PSII mode and analyzed.
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Yong, Iparraguirre Cristian Alfredo, Pajar Giovanna Leonidas Palacios, Ríos Magaly Paola Peña, and Vellon Juan Pablo Baldeon. "Ruta Ruff." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653804.

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En el presente trabajo se detectó una problemática para los dueños de los canes que no tenían tiempo para pasear a sus mascotas y/o no tener con quien dejarlos cuando ellos salían por periodos largos de tiempo, para el cual presentamos esta solución un medio de intermediación digital Ruta Ruff. Este medio digital pone a disposición una cartera amplia de paseadores en donde podrán escoger al paseador que más se asemeja a sus necesidades. Las instalaciones se encontrarán en Calle Los Guacamayos 197 Of. 102 Urb. Limatambo Surquillo, Lima – Perú. Para iniciar las opresiones la empresa Ruta Ruff necesitara una inversión de S/. 60,201.00 para la implementación de los activos fijos y S/. 16,256 para la publicidad del primer mes, obteniendo utilidades a partir del octavo mes de haber iniciado sus operaciones y con una tasa de crecimiento de usuarios de 100% en el primer año, para lo cual contamos dentro de los miembros un equipo con experiencia en el campo de la administración, marketing y contabilidad. Este proyecto tiene mucho potencial debido al crecimiento de la población que cuenta con una mascota en casa, asimismo muchas de ellas cada vez más y con más frecuencias usan aplicativos móviles para adquirir productos y servicios, entonces esta propuesta de negocio encaja muy bien con el nuevo estilo de consumo del ciudadano de Lima Metropolitana.
In this work, a problem was detected for the owners of the dogs who did not have time to walk their pets and / or have no one to leave them with when they went out for long periods of time, for which we present this solution as a means of intermediation. Ruff Route digital. This digital medium offers a wide portfolio of walkers where they can choose the walker that most closely matches their needs. The facilities will be located at Calle Los Guacamayos 197 Of. 102 Urb. Limatambo Surquillo, Lima - Peru. To start the oppressions, the Ruta Ruff company will need an investment of S /. 60,201.00 for the implementation of fixed assets and S /. 16,256 for the advertising of the first month, obtaining profits from the eighth month of starting operations and with a growth rate of 100% users in the first year, for which we have within the team a team with experience in field of administration, marketing and accounting. This project has a lot of potential due to the growth of the population that has a pet at home, also many of them more and more and more frequently use mobile applications to acquire products and services, so this business proposal fits very well with the new consumption style of the citizen of Metropolitan Lima.
Trabajo de investigación
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Books on the topic "RFF"

1

Riff raff. New York: Dramatists Play Service, 1997.

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Barnes, Douglas F. The Challenge of Rural Electrification: Strategies for Developing Countries (RFF Press) (RFF Press) (RFF Press) (RFF Press). Resources for the Future Press, 2007.

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Barnes, Douglas F. The Challenge of Rural Electrification: Strategies for Developing Countries (RFF Press) (RFF Press) (RFF Press) (RFF Press). Resources for the Future Press, 2007.

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(Editor), Wade E. Martin, Carol Raish (Editor), and Brian Kent (Editor), eds. Wildfire Risk: Human Perceptions and Management Implications (RFF Press) (RFF Press) (RFF Press). Resources For the Future Press, 2007.

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(Editor), Wade E. Martin, Carol Raish (Editor), and Brian Kent (Editor), eds. Wildfire Risk: Human Perceptions and Management Implications (RFF Press) (RFF Press) (RFF Press). Resources For the Future Press, 2007.

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Guijt, Irene. Negotiated Learning: Collaborative Monitoring for Forest Resource Management (RFF Press) (RFF Press) (RFF Press). RFF Press, 2007.

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Negotiated Learning: Collaborative Monitoring for Forest Resource Management (RFF Press) (RFF Press) (RFF Press). Resources for the Future Press, 2007.

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Resources, for. The RFF Superfund National Priorities List Database (RFF Press). RFF Press, 1995.

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Oates, Wallace E. The RFF Reader in Environmental and Resource Policy (RFF Press). RFF Press, 2006.

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Oates, Wallace E. The RFF Reader in Environmental and Resource Policy (RFF Press). RFF Press, 2006.

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Book chapters on the topic "RFF"

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Langer, Arthur M. "Establishing Requirements Using RFP and RFI." In Guide to Software Development, 49–70. London: Springer London, 2011. http://dx.doi.org/10.1007/978-1-4471-2300-2_4.

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Cardullo, R. J. "Work, Family, and Politics: Ken Loach’s Riff-Raff." In Teaching Sound Film, 205–11. Rotterdam: SensePublishers, 2016. http://dx.doi.org/10.1007/978-94-6300-726-9_22.

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Pachnis, V., A. Belayew, and S. M. Tilghman. "Studies into the raf and Rif Genes in the Mouse." In Current Topics in Microbiology and Immunology, 50–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70740-7_7.

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Martemyanov, Kirill A., Pooja Parameswaran, Irene Aligianis, Mark Handley, Marga Gual-Soler, Tomohiko Taguchi, Jennifer L. Stow, et al. "RAF-1 (C-RAF)." In Encyclopedia of Signaling Molecules, 1562–70. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0461-4_591.

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Varga, Andrea, and Manuela Baccarini. "RAF-1 (C-RAF)." In Encyclopedia of Signaling Molecules, 4415–24. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67199-4_591.

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Gottron, Thomas, and Steffen Staab. "RDF." In Encyclopedia of Social Network Analysis and Mining, 1497–98. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-6170-8_114.

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Posypaiko, V. I., and E. A. Alekseeva. "RbF." In Phase Equilibria in Binary Halides, 377–80. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-9024-4_141.

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Gottron, Thomas, and Steffen Staab. "RDF." In Encyclopedia of Social Network Analysis and Mining, 2036–38. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7131-2_114.

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Bien, Christian G., Christian E. Elger, Ali R. Afzal, Sirajedin Natah, Ritva Häyrinen-Immonen, Yrjö Konttinen, George S. Zubenko, et al. "RFS." In Encyclopedia of Molecular Mechanisms of Disease, 1852. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_6700.

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Yue, Ning J., Kent Lambert, Jay E. Reiff, Anthony E. Dragun, Ning J. Yue, Jay E. Reiff, Jean St. Germain, et al. "RFA." In Encyclopedia of Radiation Oncology, 756. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-85516-3_1245.

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Conference papers on the topic "RFF"

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Chhangani, Varun, Rangeet Mitra, and Vimal Bhatia. "RFF Based Parallel Detection for Massive MIMO." In 2020 European Conference on Networks and Communications (EuCNC). IEEE, 2020. http://dx.doi.org/10.1109/eucnc48522.2020.9200947.

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Deng, Wei, Zhen Wang, Wei Liu, Hongliang Chang, Feiyi Xie, Zhe Wang, and Hong Wen. "The Evaluation of RFF Authentication for Edge Computing." In 2020 IEEE International Conference on Artificial Intelligence and Information Systems (ICAIIS). IEEE, 2020. http://dx.doi.org/10.1109/icaiis49377.2020.9194949.

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Japertas, Saulius, Aurelijus Budnikas, and Gedeiminas Činčikas. "Identification Technology of Mobile Phone Devices Using RFF." In International Conference on Wireless Information Networks and Systems. SCITEPRESS - Science and and Technology Publications, 2014. http://dx.doi.org/10.5220/0005011800470052.

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Rubab, Saddaf, Mohd Fadzil Hassan, Ahmad Kamil Mahmood, and Syed Nasir Mehmood Shah. "Random Forest Forecast (RFF): One hour ahead jobs in volunteer grid." In 2016 3rd International Conference on Computer and Information Sciences (ICCOINS). IEEE, 2016. http://dx.doi.org/10.1109/iccoins.2016.7783223.

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Luo, Weifeng, Xinchen Xu, Wei Deng, Shan He, Man Li, Feiyi Xie, and Hong Wen. "A RFF Access Authentication Technology Based on K-Nearest Neighbor Method." In 2019 International Conference on Intelligent Computing, Automation and Systems (ICICAS). IEEE, 2019. http://dx.doi.org/10.1109/icicas48597.2019.00183.

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Portella, Luigi, Crescenzo D'Alterio, Marianeve Polimeno, Caterina Ieranò, Maria Napolitano, Rosa Calemma, Antonio Barbieri, et al. "Abstract 4645: Preclinical development of RFF-1, a novel rational designed CXCL12 mimetic drug." In Proceedings: AACR 103rd Annual Meeting 2012‐‐ Mar 31‐Apr 4, 2012; Chicago, IL. American Association for Cancer Research, 2012. http://dx.doi.org/10.1158/1538-7445.am2012-4645.

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Zainuddin, Nurjuanis Z., Benjamin A. Lindley, and Geoffrey T. Parks. "Towards Optimal In-Core Fuel Management of Thorium-Plutonium-Fuelled PWR Cores." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15246.

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Plutonium is a significant proliferation concern as well as a major contributor to the long-term toxicity of nuclear waste. Partial incineration in PWRs with uranium-MOX fuel is often considered to mitigate these concerns. Thorium-MOX is an alternative fuel with superior material properties and higher plutonium destruction rates, as shown in multiple feasibility studies. However, the core performance and operational characteristics (e.g. discharge burn-up, feasibility of controlling the core) are ultimately dependent on the core loading pattern (LP) and burnable poison (BP) design. In this paper, the LP for Th-Pu fuel of various compositions is optimized for (1) discharge burn-up, (2) radial form factor (RFF), (3) cycle length, (4) moderator temperature coefficient (MTC), and (5) reactivity swing over cycle. Maximizing the cycle length makes the discharge burn-up and reactivity swing worse due to placement of once- and twice-burnt fuel near the core periphery. It also makes the MTC less negative. The harder neutron spectrum of Th-Pu fuel compared to conventional U fuel favours the use of distributed integral burnable poisons to control the reactivity swing over the cycle. This leads to a significant amount of dissimilarity between LPs with relatively similar performance measures, and between optimal LPs for different Pu loadings in the fuel. The RFF can vary throughout the cycle but a careful placement of the assemblies can mitigate this. The cycle reactivity swing is controlled using enriched soluble boron, which makes the MTC worse, and this constrains feasibility for high Pu loading in the fuel.
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Elkacimi, Younes, and Norbert Mu¨ller. "Regenerative Flow Pumps and Compressors (RFP/RFC) Applications for Water as Refrigerant." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13486.

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This paper presents some preliminary design consideration of Regenerative Flow Pumps and Compressors (RFP/RFC) and their application in chillers that use water (R718) as the sole refrigerant. A brief overview of the fundamentals and hypothesis of the operation of RFP/RFC is presented. A one-dimensional (1-D) performance prediction code of an RFP/RFC model is developed using geometric parameters as input. Results of a sensitivity analysis are briefly discussed as they are validated using CFD analysis and suggest design changes for performance enhancement. Finally the RFC may be considered as an interesting alternative solution for R718-chiller application especially for smaller capacities and operation with lower speed.
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Clifford, Dale. "Academic | Practice Partnership— Developing Responsive Architecture." In AIA/ACSA Intersections Conference. ACSA Press, 2015. http://dx.doi.org/10.35483/acsa.aia.inter.15.2.

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Academic entities have the ability to assemble resources and form ‘local labs’ able to creatively address complex technical problems. This paper describes academic partnerships with professional practice that offer responsive materials design expertise not available in many architectural firms. The following projects are funded by grants, gifts, and consultation mechanisms with architectural firms during the Request for Qualifications (RFQ) and the Request for Proposals (RFP) phase in competitive design solicitations. The RFQ and the RFP mechanisms are high-value low-risk means for architectural firms to add research and development capabilities to their project team. Example are given of two collaborative projects that have brought practice-based research to the architectural office and brought practical experience to students.
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Raheel, Mukarrum, and Abraham Engeda. "Current Status, Design and Performance Trends for the Regenerative Flow Compressors and Pumps." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39594.

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Regenerative flow compressors and pumps, hereafter called RFC/RFP have found many applications in industry; still they are the most neglected turbomachines in the family of dynamic compressors. The number of publications existing in literature is very small compared to the large number of papers about the centrifugal and axial turbocompressors. This paper gives a detail discussion of fundamentals and working principle of regenerative turbomachines. Regenerative compressors are compared with centrifugal compressors and the importance of regenerative turbomachines in low specific speed range is emphasized. The major findings of available literature on regenerative turbomachine are summarized. The current status, limitations and some of the challenges faced by RFC/RFP are assessed in context of performance improvement. The paper concludes with an overview of ongoing research and future directions to be followed for performance improvement of this neglected class of turbomachines.
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Reports on the topic "RFF"

1

Ko, Hanseok. Forth Graphics Toolbox (A User's Guide for Use with RFF Forth). Fort Belvoir, VA: Defense Technical Information Center, June 1991. http://dx.doi.org/10.21236/ada242916.

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Eggert, L. Moving the Undeployed TCP Extensions RFC 1072, RFC 1106, RFC 1110, RFC 1145, RFC 1146, RFC 1379, RFC 1644, and RFC 1693 to Historic Status. RFC Editor, May 2011. http://dx.doi.org/10.17487/rfc6247.

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Daigle, L., ed. The RFC Series and RFC Editor. RFC Editor, July 2007. http://dx.doi.org/10.17487/rfc4844.

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Housley, R., and L. Daigle, eds. The RFC Series and RFC Editor. RFC Editor, February 2020. http://dx.doi.org/10.17487/rfc8729.

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Pichler, Rupert. The Research Financing Act. A New Framework for Publicly Funded Research in Austria and its Impact on Evaluation. Fteval - Austrian Platform for Research and Technology Policy Evaluation, July 2021. http://dx.doi.org/10.22163/fteval.2021.514.

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On 7 July 2020, the National Council – the first chamber of the Austrian Parliament – passed a package of legislation introducing a new framework for the methods of allocating federal budgets to research, technology, and innovation (RTI). Its core is the Research Financing Act (RFA), complemented by several amendments to existing laws that are necessary for its implementation. Entry into force was on 25 July 2020, the amendments became effective as of 1 January 2021 (BGBl1. I No. 75/20202). The RFA is the biggest legislative project in the field of RTI policy since 2004 when the Research Funding Agency (FFG) was established (Pichler et al. 2007, pp. 329-336; Stampfer et al. 2010, pp. 775-776). For the first time, budget law regulations are now aligned with the needs of institutions performing or funding RTI (Pichler 2021). This article outlines the background and content of the RFA and concludes with a view on the significance of evaluation within the new system.
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Brennan M. J., V. LoDestro, and T. Russo. RFQ Repetition Rate. Office of Scientific and Technical Information (OSTI), July 1986. http://dx.doi.org/10.2172/1131540.

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Hersey, Anne. ChEMBL-RDF/20.0. EMBL-EBI, February 2015. http://dx.doi.org/10.6019/chembl.rdf.20.0.

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Cottingham J. G. R.F. bucket area. Office of Scientific and Technical Information (OSTI), May 1986. http://dx.doi.org/10.2172/1150412.

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Flanagan, H., and S. Ginoza. RFC Style Guide. RFC Editor, September 2014. http://dx.doi.org/10.17487/rfc7322.

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Flanagan, H. RFC Format Framework. RFC Editor, December 2016. http://dx.doi.org/10.17487/rfc7990.

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