Relevant bibliographies by topics / Broadbent

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Broadbent'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Broadbent"

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Broadbent, C. "Colin Broadbent." BMJ 345, oct31 1 (October 31, 2012): e6933-e6933. http://dx.doi.org/10.1136/bmj.e6933.

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Fye, W. B. "William Henry Broadbent." Clinical Cardiology 13, no. 1 (January 1990): 62–64. http://dx.doi.org/10.1002/clc.4960130112.

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Broadbent, Jonathan M., W. Murray Thomson, Terrie E. Moffitt, and Richie Poulton. "Broadbent et al. Respond." American Journal of Public Health 105, no. 4 (April 2015): e3-e4. http://dx.doi.org/10.2105/ajph.2015.302647.

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Broadbent, Jonathan M., W. Murray Thomson, Terrie E. Moffitt, and Richie Poulton. "Broadbent et al. Respond." American Journal of Public Health 106, no. 2 (February 2016): 213–14. http://dx.doi.org/10.2105/ajph.2015.303013.

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Lynch, Kate, Harry Henry, Erwin Ephron, and Colin McDonald. "Simon Broadbent: a tribute." International Journal of Advertising 21, no. 3 (January 2002): 421–24. http://dx.doi.org/10.1080/02650487.2002.11104940.

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Craik, Fergus, and Alan Baddeley. "Donald E. Broadbent (1926–1993)." American Psychologist 50, no. 4 (April 1995): 302–3. http://dx.doi.org/10.1037/0003-066x.50.4.302.

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Iyer, Nandini, Eric Thompson, Brian Simpson, and Griffin Romigh. "Speaking while listening: Broadbent revisited." Journal of the Acoustical Society of America 137, no. 4 (April 2015): 2208. http://dx.doi.org/10.1121/1.4920040.

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Pollack, Irwin. "Broadbent, Donald E. • 1926–1993." Journal of the Acoustical Society of America 97, no. 1 (January 1995): 720. http://dx.doi.org/10.1121/1.412238.

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Eysenck, Michael W. "Perception and Communication: D.E. Broadbent." British Journal of Psychiatry 164, no. 5 (May 1994): 711–12. http://dx.doi.org/10.1192/s0007125000034759.

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Levin, Jeff. "Alex Broadbent: Philosophy of Epidemiology." Theoretical Medicine and Bioethics 35, no. 4 (January 1, 2014): 311–14. http://dx.doi.org/10.1007/s11017-013-9274-0.

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Dissertations / Theses on the topic "Broadbent"

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Broadbent, Amber Lynn. "Magnetic resonance studies of transport in multiphase pharmaceutical delivery and mixing systems." Diss., Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/broadbent/BroadbentA0511.pdf.

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In this dissertation research utilizing magnetic resonance methods to noninvasively probe the dynamics and transport properties of novel engineering systems is presented. The systems investigated are an osmotic controlled release pharmaceutical tablet as well as two mixing and reaction devices, a Taylor-Couette device and a jet-in-tube mixer. Magnetic resonance imaging of an osmotic controlled-release pharmaceutical tablet is used to measure water concentration as a function of tablet hydration time. A 1D mass transport model for tablet water hydration directly quantifies whether osmotic or diffusive processes dominate transport and is used to estimate transport coefficients for these processes. Magnetic resonance velocity mapping of Couette and Taylor vortex flow regimes for single and two-fluid systems in a vertically oriented Taylor-Couette device are compared to simulations. For the single fluids, the magnetic resonance experiments and Fluent © computational fluid dynamics simulations show excellent agreement in determining the rotation rate at which the flow transitions from Couette to Taylor vortex flow and the corresponding critical wavelength of the unstable flow. In the two-fluid studies, immiscible fluids are axially stratified in the stable density, heavy fluid on bottom, configuration. In both simulation and experiment, the two-fluid interface is observed to remain in the Couette flow regime after the pure fluids away from the interface have transitioned to the Taylor vortex flow regime, thus indicating a stabilizing force, surface tension, at the interface. A vertically oriented co-current jet-in-tube device with acetone as the jet fluid and water as the tube fluid, operated at low jet Reynolds numbers (Re jet ~ 17), is used to produce a laminar positively buoyant jet, which transitions to an unstable mixing regime, characterized by vortex formation and breakdown in flow visualization experiments. Magnetic resonance velocity mapping and diffusion measurements at varying positions downstream of the jet exit are used to characterize the mixing due to vortex formation and breakup. The buoyancy driven instability which results from introducing the less dense acetone (SG=0.79) into the more dense water (SG=1) in opposition to gravity gives rise to significantly enhanced hydrodynamic dispersion of the two fluids. Non-equilibrium statistical mechanics concepts are introduced as a model for mixing by the formation and decay of coherent vortex structures generated by the buoyant instability.
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Broadbent, Andrew. "Aminoacyl-tRNA Synthetase Production for Unnatural Amino Acid Incorporation and Preservation of Linear Expression Templates in Cell-Free Protein Synthesis Reactions." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5703.

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Proteins—polymers of amino acids—are a major class of biomolecules whose myriad functions facilitate many crucial biological processes. Accordingly, human control over these biological processes depends upon the ability to study, produce, and modify proteins. One innovative tool for accomplishing these aims is cell-free protein synthesis (CFPS). This technique, rather than using living cells to make protein, simply extracts the cells' natural protein-making machinery and then uses it to produce protein in vitro. Because living cells are no longer involved, scientists can freely adapt the protein production environment in ways not otherwise possible. However, improved versatility and yield of CFPS protein production is still the subject of considerable research. This work focuses on two ideas for furthering that research.The first idea is the adaptation of CFPS to make proteins containing unnatural amino acids. Unnatural amino acids are not found in natural biological proteins; they are synthesized artificially to possess useful properties which are then conferred upon any protein made with them. However, current methods for incorporating unnatural amino acids do not allow incorporation of more than one type of unnatural amino acid into a single protein. This work helps lay the groundwork for the incorporation of different unnatural amino acid types into proteins. It does this by using modified aminoacyl-tRNA synthetases (aaRSs), which are key components in CFPS, to be compatible with unnatural amino acids. The second idea is the preservation of DNA templates from enzyme degradation in CFPS. Among the advantages of CFPS is the option of using linear expression templates (LETs) in place of plasmids as the DNA template for protein production. Because LETs can be produced more quickly than plasmids can, using LETs greatly reduces the time required to obtain a DNA template for protein production. This renders CFPS a better candidate for high-throughput testing of proteins. However, LETs are more susceptible to enzyme-mediated degradation than plasmids are, which means that LET-based CFPS protein yields are lower than plasmid-based CFPS yields. This work explores the possibility of increasing the protein yield of LET-based CFPS by addition of sacrificial DNA, DNA which is not used as a protein-making template but which is degraded by the enzymes in place of the LETs.
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Burghoff, David Patrick. "Broadband terahertz photonics." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92964.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 181-190).
In recent years, quantum cascade lasers have emerged as mature semiconductor sources of light in the terahertz range, the frequency range spanning 1 to 10 THz. Though technological development has pushed their operating temperatures up to 200 Kelvin and their power levels up to Watt-level, they have remained unsuitable for many applications as a result of their narrow spectral coverage. In particular, spectroscopic and tomographic applications require sources that are both powerful and broadband. Having said that, there is no fundamental reason why quantum cascade lasers should be restricted to narrowband outputs. In fact, they possess gain spectra that are intrinsically broad, and beyond that can even be tailored to cover an octave-spanning range. This thesis explores the development of broadband sources of terahertz radiation based on quantum cascade lasers (QCLs). The chief way this is done is through the development of compact frequency combs based on THz QCLs, which are able to continuously generate milliwatt levels of terahertz power covering a fractional bandwidth of 14% of their center frequency. These devices operate on principles similar to microresonator-based frequency combs, and make use of the quantum cascade laser's fundamentally large nonlinearity to phase-lock the cavity modes. These devices will enable the development of ultra-compact dual comb spectrometers based on QCLs, and will potentially even act as complete terahertz spectrometers on a chip. This thesis also uses broadband terahertz time-domain spectroscopy to analyze the behavior of THz QCLs. By using QCLs as photoconductive switches, the usual limitations imposed by optical coupling are circumvented, and properties of the laser previously inaccessible can be directly observed. These properties include the gain and absorption of the laser gain medium, the populations of the laser's subbands, and properties of the waveguide like its loss and dispersion. Knowledge of these properties were used to guide frequency comb design, and were also used to inform simulations for designing better lasers.
by David Patrick Burghoff.
Ph. D.
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Dwivedi, Jogesh Kumar. "Investigating consumer adoption, usage and impact of broadband : UK households." Thesis, Brunel University, 2005. http://bura.brunel.ac.uk/handle/2438/5335.

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Despite a large investment, the majority of countries especially the UK demonstrate a slow adoption of broadband. In order to enhance the adoption and use of broadband this research examines the factors influencing the decisions of household consumers. This research aims to address the two main areas of concern: first, to investigate consumer-level factors affecting the adoption of broadband in UK households; and second, to understand the usage of broadband and its impact upon household consumers in the UK. This research adopted a quantitative approach that was executed in the following steps. First, it developed a conceptual model by selecting and justifying relevant constructs from appropriate theories and models related to technology adoption, usage and impact. Second, it operationalised the constructs by developing and validating the research instrument by employing the content validity, reliability and construct validity approach. Finally, it empirically validated and refined the conceptual model by employing a survey research approach. The findings suggested that all the constructs included in the conceptual model, except knowledge, significantly influence the consumers when adopting broadband in a UK household. The significant constructs include relative advantage, utilitarian outcomes, hedonic outcomes, primary influence, facilitating conditions resources and self-efficacy. The rate and variety of Internet usage is significantly higher for broadband consumers than narrowband ones. It was also found that significantly more numbers of broadband consumers perceived changes in time allocation patterns on various daily life activities than narrowband ones. This research contributes towards theory, practice and policy. The contribution of this research towards theory is that it integrates and determines the appropriate information systems (IS) literature in order to enhance knowledge of technology adoption from the consumers' perspectives. An added contribution to theory is the development and validation of a research instrument that future studies can utilise to examine broadband and other similar technologies in household context. Considering the slow adoption of broadband, this research also provides implications for policy makers and the providers of broadband in order to encourage and promote homogenous adoption and usage.
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Stevens, Irena. "Policy implications of municipal investment in Georgia's wireline broadband networks." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49081.

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The Community Broadband Investment Act, introduced in the Georgia legislature in 2012 and 2013 is a reflection of a broader national debate over the role of government investment in broadband infrastructure. The bill would limit local governments' ability to invest in broadband infrastructure for their communities because of arguments that government entry into the telecommunications sector crowds-out private competition, does not serve the public adequately, and lacks a comprehensive business model or best practices. A closer look at the history of utility regulation and various economic perspectives on the proper government role in utility provision reveals that government has had an extensive historical role in utility infrastructure investment and regulation, and several economic doctrines support the conclusion that government can be helpful in facilitating effective broadband service to their communities. Case studies of different models of municipal broadband networks in Georgia reveal that government entry can facilitate private sector competition, often provides quality service, and has a set of best practices. The success of municipal broadband reveals an evolution in the approach to telecommunications regulation from a regulated monopoly approach to a public-private cooperation approach which considers public participation with private entities on a dynamic scale. Government-entry into the broadband market was a rational decision for several Georgia communities due to their unique set of circumstances, and while municipal broadband may not be the answer to many communities' problems with meeting public demand, communities should be allowed to maintain flexibility in their decision-making about how to best serve their residents, effectively allowing them to decide which combination of public and private advantages they can leverage to meet the demand of their communities in relation to their unique local characteristics.
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JIANG, YANYAN. "BROADBAND INVESTMENT AND REGULATION." Doctoral thesis, Università Cattolica del Sacro Cuore, 2010. http://hdl.handle.net/10280/693.

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La tesi è strutturata in 3 capitoli e analizza gli investimenti e la regolamentazione nel broadband market". Il primo capitolo analizza la letteratura teorica ed empirica sul rapporto tra gli investimenti e la regolamentazione nel settore delle telecomunicazioni. Il secondo capitolo fornisce un'analisi teorica sullo "stepping-stone theory". La terza parte fornisce un'analisi sull'impatto dei diversi regimi normativi per la costruzione della Next Generation Networks.
This dissertation is composed of three papers and discusses the issue of investment and regulation in broadband market. The first paper reviews the specialized but growing branch of the literature. It surveys the relevant theoretical and empirical literature on the relationship between regulation, at both retail and wholesale level, and investment in telecoms infrastructures. Theoretical analyses state that with respect to retail (incentive) regulation, the firm‘s incentive to invest is related to the level of price cap. As for access regulation, mandatory unbundling can possibly discourage firms‘ incentive to invest, but this is not the case for all circumstances because some studies have displayed an opposite (positive) effect on investment. The influence of regulators‘ limited ability to make credible commitment ex ante is not negligible either. Evidence in empirical findings exhibits a certain disunity. The majority concludes that local loop unbundling based on forward-looking cost methodology discourages both ILECs and CLECs from investing in networks, so that the stepping-stone theory is possibly not supported by the data; other findings support the non-negative effect of access regulation on investment. The second paper provides theoretical analysis on the stepping-stone theory. We dynamically model the competition between a vertically-integrated incumbent firm and a facilities-free new entrant in broadband market, where both firms are entitled with investment options: not only can the incumbent decide how much to spend in upgrading its existing network, but also the entrant can choose whether and when to invest on the construction of its own network. The analysis is conducted under three different kinds of competition: pure services-based, pure facilities-based and mixed competition. We find that the entrant's ability to provide value-added services affects the incumbent's investment choice. Our simulation results support the stepping-stone theory that access regulation provides an impetus for the entrant to invest in their own facilities after entering the market based on leased lines. It is also socially desirable because both the overall welfare and the consumer surplus are maximized in a regulated market under mixed competition. The third paper studies impacts of different regulatory regimes on the construction of Next Generation Networks (NGNs). We model the competition between a vertically-integrated incumbent firm and a facilities-free entrant firm in broadband market, where the incumbent has an investment option to upgrade its current network to the NGN. In order to analyze how policy settings affect the incumbent firm‘s investment choice, three kinds of regulatory regimes are discussed: no regulation, partial regulation (only the traditional network is regulated and the NGN is unregulated) and full regulation (both the traditional network and the NGN are regulated). We find that not only the entrant‘s ability to provide value-added services, but also the substitution factor that indexes the decrease in consumers‘ willingness to pay for the traditional service once the investment occurs, affect the incumbent‘s investment choice. Moreover, the comparison of results under different regimes shows that the incumbent invests the most under partial regulation, which sheds some light on impelling the deployment of Next Generation Networks.
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Johnson, André Mark Allan. "Broadband feed antenna design." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43532.

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This thesis describes the development of a log-periodic waveguide feed antenna from concept to design and finally to prototyping and testing. An electromagnetic simulator (CST) was used to evaluate different design concepts and a design based on a nested coaxial waveguide structure was selected. A design was developed that included a common excitation structure for all the waveguides and an aperture matching structure that scales periodically with frequency. In the design, each waveguide has a bandwidth ratio of 2:1 and the total bandwidth of the design is 1 GHz to 8 GHz. A physical model was created using the SolidWorks design software and a prototype was manufactured and tested. Simulation results were in good agreement with the experimental results over the majority of the antenna's bandwidth. The antenna design had good farfield patterns across most of the antenna's bandwidth with frequency-specific farfield issues. The return loss of the antenna varied greatly with frequency, being greater than 2 dB across the entire bandwidth of the antenna and greater than 6 dB for the majority of the bandwidth of the antenna. There were significant difficulties in achieving a good return loss at the aperture which limited the return loss of the antenna. This work demonstrates the potential of employing a nested coaxial waveguide structure for wideband feed applications.
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Sparandara, Jennie. "Broadband and work habits." CONNECT TO ELECTRONIC THESIS, 2007. http://dspace.wrlc.org/handle/1961/4178.

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Reim, Klaus Franz. "Broadband optical quantum memory." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:d0d73ed2-32c2-4de9-8b3d-fcf8b88b22b4.

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This thesis is about the experimental implementation of a high-speed and robust quantum memory for light. A novel far off-resonant Raman approach to ensemble-based quantum memories in a room-temperature environment is developed and demonstrated. Storage and retrieval of sub-nanosecond, weak coherent light pulses at the single-photon-level with total efficiencies exceeding 30% and storage times of up to 4 μs are achieved. The coherence of the memory is shown by directly interfering a copy of the incident signal with the retrieved signal from the memory. The unconditional noise floor of the memory is found to be low enough to operate the memory in the quantum regime at room temperature. Multiple readout of a single stored excitation is demonstrated, suggesting that 100% readout is possible in different temporal modes. Furthermore, first results regarding the storage and retrieval of polarisation encoded qubits are obtained. This and the memory’s ability to operate in the quantum regime at room temperature with a low unconditional noise floor illustrate its potential usefulness for real world applications.
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Stock, Michael. "Broadband interferometry of lightning." Thesis, New Mexico Institute of Mining and Technology, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3684400.

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A lightning interferometer is an instrument which determines the direction to a lightning-produced radio point source by correlating the signal received at two or more antennas. Such instruments have been used with great success for several decades in the study of the physical processes present in a lightning flash. However, previous instruments have either been sensitive to only a narrow radio bandwidth so that the correlation can be done using analog hardware, or have been sensitive to a wide bandwidth but only recorded a short duration of the radiation produced by a lightning flash.

In this dissertation, a broad bandwidth interferometer is developed which is capable of recording the VHF radio emission over the entire duration of a lightning flash. In order to best utilize the additional data, the standard processing techniques have been redeveloped from scratch using a digital cross correlation algorithm. This algorithm can and does locate sources as faint as the noise level of the antennas, typically producing 100,000 or more point source locations over the course of a lightning flash.

At very low received power levels, the likelihood that a signal received at the antenna will be affected by the environmental noise is substantially higher. For this reason, the processing allows for the integration windows of the cross correlation to be heavily overlapped. In this way, the location of each event can be based on a distribution of windows. Further, noise identification techniques which leverage the heavily overlapped windows have been developed based on: the closure delay, the standard deviation, the correlation amplitude, and the number of contributing windows. The filtration techniques have proven to be very successful at identifying and removing mis-located sources, while removing the minimum number of low amplitude sources which are well located.

In the past, lightning interferometers have been limited to using only two perpendicular baselines to determine the direction to each point source. Additional techniques are developed in this dissertation for efficiently computing the image of a point source in the sky using an arbitrary number of antennas in an arbitrary configuration. The multiple baseline techniques further improves the sensitivity and accuracy of the locations provided by broadband interferometers.

To demonstrate the usefulness of broadband interferometers, the activity of 6 flashes spanning a diverse selection of lightning flash types are examined in this dissertation. This includes detailed analysis of negative stepped leaders, positive un-stepped leaders, K-changes, and fast positive breakdown. Initial breakdown pulses which are seen at the beginning of the flash are found to be no different than horizontal negative leader steps seen later in the flash. Evidence is found that positive leaders produce VHF radiation, as opposed to all of the radiation in the positive breakdown region being produced by retrograde negative breakdown. The time resolved three-dimensional velocity of 47 K-changes occurring in two flashes is measured. And finally, fast positive breakdown is characterized and found to be produced by a positive streamer process instead of a leader process.

Observations made with the instrument showcase the capabilities of a continuous sampling broadband interferometer. The instrument makes possible measurements which were difficult or impossible to obtain in the past, and the preliminary observations allude to many exciting scientific findings to come.

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Books on the topic "Broadbent"

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Steed, Judy. Broadbent: The search for integrity. Markham, Ont: Viking, 1988.

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Steed, Judy. Ed Broadbent: The pursuit of power. Markham, Ont., Canada: Viking, 1988.

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Steed, Judy. Ed Broadbent: The pursuit of power. Markham, Ont: Penguin Books, 1988.

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Steed, Judy. Ed Broadbent: The pursuit of power. Markham, Ont: Penguin Books, 1989.

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Haslop, Dennis. Broadbent telecommunications: A step into the future. Henley: The Management College, 1993.

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Ed Broadbent: La conquête obstinée du pouvoir. Montréal, Qué: Éditions de l'homme, 1988.

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Broadbent, Stephen. Stephen Broadbent, sculptor: Commissions from 1987-1997. Prenton, Wirral: G. Woodland, 1998.

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Broadbent, J. M. (John Michael), 1927-. Broadbent's wein-notizen: Michael Broadbent bescreibt und bewertet grosse weine und jahrgänge aus drei jahrhunderten. Bern: Hallwag Verlag in Zusammenarbeit mit Christie's London, 1994.

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Levitt, Joseph. Fighting back for jobs and justice: Ed Broadbent in parliament. Ottawa: LLA Pub., 1996.

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Broadbent, J. M. (John Michael), 1927-. Candidature of J. Michael Broadbent [in the] election of sheriffs for the City of London. London: C. Hughes, 1993.

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Book chapters on the topic "Broadbent"

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Sánchez-González, José C., José C. Loredo-Narciandi, Peggy Brady-Amoon, Vincent W. Hevern, John A. Mills, Roger K. Thomas, Alan J. Feldman, et al. "Broadbent, Donald." In Encyclopedia of the History of Psychological Theories, 135–37. New York, NY: Springer US, 2012. http://dx.doi.org/10.1007/978-1-4419-0463-8_36.

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Craik, Fergus I. M. "Broadbent, Donald E." In Encyclopedia of psychology, Vol. 1., 476–77. Washington: American Psychological Association, 2000. http://dx.doi.org/10.1037/10516-182.

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Weik, Martin H. "broadband." In Computer Science and Communications Dictionary, 147. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_1869.

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Callan, Kristine E., Lucas Illing, and Daniel J. Gauthier. "Broadband Chaos." In Nonlinear Laser Dynamics, 317–32. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527639823.ch13.

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Rowbotham, T. R. "Broadband fibre." In Communications After ad2000, 201–14. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-3066-4_14.

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Lagasse, Paul, and Ingrid Moerman. "Broadband Communication." In True Visions, 185–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-28974-6_10.

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Weik, Martin H. "broadband exchange." In Computer Science and Communications Dictionary, 147. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_1870.

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Weik, Martin H. "broadband system." In Computer Science and Communications Dictionary, 148. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_1873.

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Brewster, R. L. "Broadband ISDN." In ISDN Technology, 77–83. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1592-6_8.

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Acampora, Anthony S. "Broadband Applications." In An Introduction to Broadband Networks, 317–27. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4757-9165-5_8.

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Conference papers on the topic "Broadbent"

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Oliveira, Rafael Mello, Antônio C. G. Maçada, and Adolfo A. Vanti. "Infra-estrutura de Tecnologia de Informação – Análise da Visão e Conjunto de Serviços - Estudo Piloto." In II Simpósio Brasileiro de Sistemas de Informação. Sociedade Brasileira de Computação, 2005. http://dx.doi.org/10.5753/sbsi.2005.14964.

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A decisão de quanto investir e qual tipo de infra-estrutura determinada empresa necessita é uma escolha estratégica decisiva para as empresas. Este artigo trata da utilização do modelo proposto por Weill & Broadbent na determinação da visão e conjunto de serviços de infra-estrutura de TI em um terminal de containers, e analisa a viabilidade da utilização deste modelo em uma pesquisa quantitativa. O estudo é um teste piloto com os administradores, CIO (Chief Information Officer) e CEO (Chief Executive Officer) da Tecon Rio Grande S.A. e o produto da pesquisa é a apresentação da verificação da efetividade do modelo nas proposições apresentadas.
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He, Daqian, Dahai Zhang, Congying Wang, and Xirui Peng. "A Broadband Array Signal Processing Method Based on Joint Sparsity of Signal Spatial Domain." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95530.

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Abstract Broadband underwater acoustic signal direction of arrival (DOA) estimation method is an important part of underwater array signal processing. The commonly used array signal DOA estimation algorithms due to the restriction of algorithm principles, are unable to process broadband array signal effectively, at the case of the arriving signals have strong correlation, small sampling snapshots or small arrival angle. Therefore, we need a new efficient algorithm to meet the increasing demand of broadband under water acoustic signal processing method. This paper makes use of the broadband acoustic signal similarity of joint sparsity in signal spatial domain received by underwater sonar arrays, establishes the whole space grid covering all broadband frequency domain slices. On the basis, the global sparsity of each frequency domain slice is combined with sparse element extraction class algorithm. By integrating the energy of signal on each slice, the spatial sparsity of each slice is obtained, from which we can get the directions of the arriving broadband wave signals. Through the simulation analysis and experimental verification on lake, we can be see that: The SDJS algorithm improves the performance and signal processing capability of the algorithm compared with the traditional algorithms. Therefore SDJS algorithm has a widely range of research value and application space.
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Xu, Kun-Bo, Wei-Yang Qiao, Fan Tong, Wei-Jie Chen, and Liang-Feng Wang. "Broadband Sound Power Determination With Modal Decomposition." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42812.

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For the assessment and improvement of noise reduction concepts and the validation of broadband sound power determination in flow ducts, the detailed knowledge of the in-duct acoustic mode spectrum and subsequent broadband noise sources separation is of great interest. A broadband noise mode analysis method was experimentally applied on broadband sound fields at 4 operation points, which were generated by means of a low speed fan test rig. Two axial sensor arrays were mounted wall-flush upstream of the fan. Measurements were made at operating conditions from 40% to 100% rotor design speed. On the whole, broadband mode waves transmitted in the flow direction is 2dB higher than against the flow direction. Mode amplitude results show that the mode decomposition results strongly depend on the chosen reference microphone. Sound power becomes higher as the speed increases. The deviation of results in and against flow directions calculated with different reference microphones is 4dB at all the operation points except for 40% design speed. A deviation of almost 10dB appears in broadband sound power results with different reference microphone in the frequency range, much higher than the results of previous experiment. The method is more accurate if it considers the phenomenon that mode waves in turbo-machinery are partly correlated with each other.
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Kubota, Madoka, Morris Flynn, Takashi Hikihara, and Vakhtang Putkaradze. "Tree-Like Resonators Assembly for Broadband Energy Harvesting." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34834.

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This paper specifies the configuration of a harvester for absorbing energy from ambient oscillation with broadband frequencies. Two major methodologies for broadband harvesting have been developed, one is the use of a nonlinear oscillator, and the other is the use of multiple resonators. We focus on the traditional way of assembling multiple resonators but suggest some nontrivial improvements in the configuration. In order to make a variety of resonant frequencies, resonators can be connected in series, in the form of a tree-like structure. The energy absorption of the tree configuration harvester under broadband frequency excitation is tested, and additionally the placement of multiple resonators is also considered. The numerical results indicate that our proposal of the tree configuration might be useful under broadband frequency excitation.
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Samuelson-Sanford, Cameron B., Frederic F. Grant, Philip S. Hashimoto, and Yahya Y. Bayraktarli. "Structure Response and Clipping Factor Variabilities Using Probabilistic In-Structure Response Spectra for Functional Seismic Fragility Evaluation of Equipment." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45660.

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For seismic probabilistic safety assessment of nuclear power plants (NPPs), test-based seismic fragilities for equipment can be developed using the results of dynamic testing. Electric Power Research Institute (EPRI) TR-103959 [1] formulates test-based equipment fragilities by comparing broadband test response spectra (TRS) to broadband demand spectra. Alternatively, broadband capacity spectra based on earthquake experience can be compared to broadband demand spectra to develop seismic fragilities for equipment that meet the screening criteria of EPRI NP-6041-SL [2]. In-structure demand spectra can exhibit narrow spectral peaks. A clipping factor recommended by EPRI TR-103959 [1] is typically used to clip these peaks to obtain median broadband demand spectra for comparison to broadband TRS. Similarly, a clipping factor recommended by EPRI NP-6041-SL [2] is typically used to obtain conservative deterministic broadband demand spectra for seismic margin assessment. Four methods are investigated to assess their applicability for estimating clipping factor variability and structure response variability from probabilistic in-structure response spectra (ISRS) with narrow spectral peaks. Probabilistic ISRS at a given structural degree of freedom (DOF) are obtained from thirty simulations by the Latin Hypercube Sampling method. The most rigorous method involves independently clipping each of the thirty probabilistic ISRS. Structure response and clipping factor variabilities are calculated based on statistical analyses of the thirty clipped ISRS. The other three methods are simplified alternatives to the more rigorous method and require less quantification effort. They involve calculating the median and 84th percentile non-exceedance probability (NEP) ISRS from the thirty unclipped ISRS. The clipping factors and associated clipping factor and structural response variabilities are calculated following the guidance of EPRI TR-103959 [1] and EPRI NP-6041-SL [2]. The results of the four methods are compared, and recommendations for determining the total variability due to structure response and peak clipping are developed. Two approaches that take the lesser combined variability for structure response and clipping from two methods are found to reasonably approximate the more rigorous method.
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Xu, Kunbo, Weiyang Qiao, Fan Tong, and Renke Wei. "Radial Mode Analysis of Broadband Noise in Flow Ducts Using Azimuthal Sensor Array." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64524.

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For the evaluation and improvement of fan noise reduction notions and the verification of broadband sound power measurement in flow ducts, special interest was given to the analysis of the broadband noise fields in duct. Two axial sensor arrays were wall-flush mounted upstream of a single-stage axial fan in the circular duct section of the fan inlet, staggered by 180° in the circumferential direction. During the tests, the rotating drum was rotated by step of 6 degrees to give a total 840 measurement points. There are two static reference microphones mounted upstream of rotating measurement section. Time-series of 12 seconds duration were recorded at each of the 30 azimuthal positions of the rotating duct in order to allow for a statistically accurate cross-correlation data analysis. This method is able to discriminate the sound waves propagating in upstream and downstream directions. Special attention was given to the blade passing frequencies of the axial fan. Rotor-stator interaction mode dominates the incident sound field, while modes with low azimuthal order play an important role in the reflected sound field. The reflected broadband sound power is almost 10dB lower than the transmitted sound field in a broad-frequency range. On the whole, this method behaves robustly in decomposition of broadband noise in flow duct and delivers physically meaningful broadband mode amplitudes.
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Violato, Daniele, Arjen de Jong, and Joachim Golliard. "Advances in Universal Scaling for Broadband Turbulent Noise in Internal Flow Devices." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28299.

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This paper focuses on the scalability of broadband turbulent noise in internal pipe flows. It discusses a universal scaling approach for broadband turbulent noise that is based on surface acoustic power modeled by ANSYS Fluent. This investigation proposes a strategy for amplitude scaling at frequencies above the onset frequency for non-planar acoustic waves, offering a generalized formulation for circular and rectangular pipes. Information based on the surface acoustic power, wall shear stress, kinetic energy and dynamic pressure is explored in view of improving the frequency scaling approach. For short, long and mitred bends, the reversed method is applied to reconstruct the broadband noise spectra, which compare well with the experimental ones. Finally, the noise spectra reconstruction is performed for T-joint and tees geometries.
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Darling, Douglas, Krishnan Radhakrishnan, and Ayo Oyediran. "Combustion Noise at Elevated Pressures in a Liquid-Fueled Premixed Combustor." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-308.

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Noise generated in gas turbine combustors can exist in several forms — broadband noise, sharp resonant peaks, and regular or intermittent non-linear pulsing. In the present study, dynamic pressure measurements were made in several JP-5-fueled combustor configurations, at various mean pressures and temperatures. The fluctuating pressure was measured at mean pressures from 6 to 14 atm and inlet temperatures from 550 K to 850 K. The goal of the present work was to study the effect of changes in mean flow conditions on combustor noise: both broadband noise and sharp tones were considered. In general, the shape of the broadband noise spectrum was consistent from one configuration to another. The shape of the spectrum was influenced by the acoustic filtering of the combustion zone. This filtering ensured the basic consistency of the spectra. In general, the trends in broadband noise observed at low mean pressures were also seen at high mean pressures; that is, the total sound level decreased with both increasing equivalence ratio and increasing inlet temperature. The combustor configurations without a central pilot experienced higher broadband noise levels and were more susceptible to narrow peak resonances than configurations with a central pilot. The sharp peaks were more sensitive to the mean flow than was the broadband noise, and the effects were not always the same. In some situations, increasing the equivalence ratio made the sharp peaks grow, while at other conditions, increasing the equivalence ratio made the sharp peaks shrink. Thus, it was difficult to predict when resonances would occur, however, they were reproducible. Noise was also observed near lean blow out. As with other types of noise, lean blow out noise was affected by the combustion chamber acoustics, which apparently maintains the fluctuations at a uniform frequency. However, the actual conditions when this type of noise was experienced appeared to simply follow the lean blow out limit, as it varied with mean temperature and pressure.
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Gavin, Joseph R., Peter D. Lysak, Michael L. Jonson, and Gerald C. Lauchle. "Benefits of Rake and Skew for Turbulence Ingestion Noise." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55385.

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Turbulent flow through a fan or pump produces a broadband spectrum of unsteady lifting forces on the blades. These forces cause undesirable blade stresses, blade vibration and sound. Jonson (1994) has shown that broadband improvements can be obtained by adding rake and skew to the stacking line of rotor blade sections. This paper adds understanding to those experimental results, and shows that benefits can be reliably predicted using analytical methods.
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van Wijngaarden, Erik, Johan Bosschers, and Gert Kuiper. "Aspects of the Cavitating Propeller Tip Vortex as a Source of Inboard Noise and Vibration." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77271.

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This paper surveys fluid dynamic-acoustic mechanisms that may explain low-frequent, broadband hull excitation experienced on board of ships and caused by propeller cavitation. Observations obtained from sea trials and model scale experiments are used to describe the hydrodynamics involved in each particular mechanism. The investigations are still ongoing and aim to identify causes of broadband inboard noise and vibration on passenger vessels in the frequency range of 20 to 70 Hz.
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Reports on the topic "Broadbent"

1

Holland, Charles W. Broadband Acoustic Clutter. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612194.

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Holland, Charles W. Broadband Acoustic Clutter. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada533133.

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Holland, Charles W. Broadband Acoustic Clutter. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada541180.

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Holland, Charles W. Broadband Acoustic Clutter. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada542055.

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Holland, Charles W. Broadband Acoustic Clutter. Fort Belvoir, VA: Defense Technical Information Center, September 2009. http://dx.doi.org/10.21236/ada531877.

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Greenstein, Shane, and Ryan McDevitt. The Broadband Bonus: Accounting for Broadband Internet's Impact on U.S. GDP. Cambridge, MA: National Bureau of Economic Research, February 2009. http://dx.doi.org/10.3386/w14758.

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Erskine, D. Techniques in Broadband Interferometry. Office of Scientific and Technical Information (OSTI), January 2004. http://dx.doi.org/10.2172/15009760.

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Uyehara, Catherine, and Scott Stewart. Broadband Respiratory Virus Surveillance. Fort Belvoir, VA: Defense Technical Information Center, October 2011. http://dx.doi.org/10.21236/ada555802.

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Alaniz, Gabriel. Tuning Broadband Microwave Amplifiers. Office of Scientific and Technical Information (OSTI), September 2003. http://dx.doi.org/10.2172/815637.

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Hodgkiss, William S. Broadband Multichannel Source-Receive Nodes. Fort Belvoir, VA: Defense Technical Information Center, March 2009. http://dx.doi.org/10.21236/ada499403.

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