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Relevant bibliographies by topics / Time-varying source

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Academic literature on the topic 'Time-varying source'

Author: Grafiati

Published: 20 February 2023

Last updated: 21 February 2023

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Journal articles on the topic "Time-varying source"

1

Coviello, Christian M., P. A. Yoon, and Leon H. Sibul. "Source separation and tracking for time-varying systems." IEEE Transactions on Aerospace and Electronic Systems 44, no. 3 (July 2008): 1198–214. http://dx.doi.org/10.1109/taes.2008.4655374.

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Soares, Cristiano, Martin Siderius, and Sérgio M. Jesus. "Source localization in a time-varying ocean waveguide." Journal of the Acoustical Society of America 112, no. 5 (November 2002): 1879–89. http://dx.doi.org/10.1121/1.1508786.

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Kian, Yavar, Éric Soccorsi, Qi Xue, and Masahiro Yamamoto. "Identification of time-varying source term in time-fractional diffusion equations." Communications in Mathematical Sciences 20, no. 1 (2022): 53–84. http://dx.doi.org/10.4310/cms.2022.v20.n1.a2.

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Eremin, Anton, Ekaterina Stefanyuk, and Liubov Abisheva. "Research on Heat Conductivity with a Time-Varying Heat Source." Applied Mechanics and Materials 698 (December 2014): 637–42. http://dx.doi.org/10.4028/www.scientific.net/amm.698.637.

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Using additional boundary conditions in the integral method of the heat balance, an approximate analytical solution to the heat conduction problem for an endless plate with time-varying heat sources has been found. It is shown that with any heat source capacity an unlimited plate temperature increase takes place in the course of time.

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Zuk, Nathaniel, and Bertrand Delgutte. "Neural coding of time-varying interaural time differences and time-varying amplitude in the inferior colliculus." Journal of Neurophysiology 118, no. 1 (July 1, 2017): 544–63. http://dx.doi.org/10.1152/jn.00797.2016.

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Binaural cues occurring in natural environments are frequently time varying, either from the motion of a sound source or through interactions between the cues produced by multiple sources. Yet, a broad understanding of how the auditory system processes dynamic binaural cues is still lacking. In the current study, we directly compared neural responses in the inferior colliculus (IC) of unanesthetized rabbits to broadband noise with time-varying interaural time differences (ITD) with responses to noise with sinusoidal amplitude modulation (SAM) over a wide range of modulation frequencies. On the basis of prior research, we hypothesized that the IC, one of the first stages to exhibit tuning of firing rate to modulation frequency, might use a common mechanism to encode time-varying information in general. Instead, we found weaker temporal coding for dynamic ITD compared with amplitude modulation and stronger effects of adaptation for amplitude modulation. The differences in temporal coding of dynamic ITD compared with SAM at the single-neuron level could be a neural correlate of “binaural sluggishness,” the inability to perceive fluctuations in time-varying binaural cues at high modulation frequencies, for which a physiological explanation has so far remained elusive. At ITD-variation frequencies of 64 Hz and above, where a temporal code was less effective, noise with a dynamic ITD could still be distinguished from noise with a constant ITD through differences in average firing rate in many neurons, suggesting a frequency-dependent tradeoff between rate and temporal coding of time-varying binaural information. NEW & NOTEWORTHY Humans use time-varying binaural cues to parse auditory scenes comprising multiple sound sources and reverberation. However, the neural mechanisms for doing so are poorly understood. Our results demonstrate a potential neural correlate for the reduced detectability of fluctuations in time-varying binaural information at high speeds, as occurs in reverberation. The results also suggest that the neural mechanisms for processing time-varying binaural and monaural cues are largely distinct.

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Zugmeyer, O., and J. P. Le Cadre. "A Multiscale Time-Varying Approach to Moving Source Tracking." IFAC Proceedings Volumes 25, no. 14 (July 1992): 481–86. http://dx.doi.org/10.1016/s1474-6670(17)50779-x.

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Bolster, Diogo, and CP Caulfield. "Transients in natural ventilation — A time-periodically-varying source." Building Services Engineering Research and Technology 29, no. 2 (May 2008): 119–35. http://dx.doi.org/10.1177/0143624407087849.

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Jiang, Jiaojiao, Sheng Wen, Shui Yu, Yang Xiang, and Wanlei Zhou. "Rumor Source Identification in Social Networks with Time-Varying Topology." IEEE Transactions on Dependable and Secure Computing 15, no. 1 (January 1, 2018): 166–79. http://dx.doi.org/10.1109/tdsc.2016.2522436.

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Sutton, Eric, and Helen Na. "Time-varying reconstruction of the ionosphere. 2. Data source analysis." International Journal of Imaging Systems and Technology 9, no. 6 (1998): 491–99. http://dx.doi.org/10.1002/(sici)1098-1098(1998)9:6<491::aid-ima11>3.0.co;2-0.

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Zhang, Jie, Hongli Gao, Qiyue Liu, and Christopher Grebe. "A new real-time signal processing approach for frequency-varying machinery." Journal of Vibration and Control 24, no. 11 (January 5, 2017): 2359–68. http://dx.doi.org/10.1177/1077546316687923.

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Development of condition monitoring approaches has played a key role in the stability and safety of frequency-varying machinery operations. Conventional time–frequency analysis methods suffer problems such as analysis results being too complex to realize highly intelligent and automated condition monitoring systems. Blind source separation is an attractive tool due to its excellent performance in separating defect source signals from their mixtures without detailed knowledge of sources and mixing processes; however, it can only be applied under some strict conditions. In this paper, a nonuniform sampling model is built and a new processing algorithm of frequency-varying signal is proposed. The relationship between the power spectral density (PSD) of the vibration signal of frequency-varying machinery and frequencies at different rotational speeds is derived. The proposed method can adaptively eliminate the influence of the varying rotational speed in the revised PSD. Some classical signal analysis methods are implemented to compare with the proposed approach by simulations. An experiment has been conducted by using a JD-1 wheel/rail simulation facility to illustrate the effectiveness of the proposed method.

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Dissertations / Theses on the topic "Time-varying source"

1

Liang, Yifan. "Separation optimality and generalized source-channel coding for time-varying channels /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Huang, Danlan. "Entrainment in Pulsing plumes." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/21168.

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The main contribution of this work is to investigate the entrainment in plumes with constant and time-varying source conditions experimentally. The study aims to build up an experiment rig to conduct the bulk entrainment measurement in plumes. Secondly, the study aims to examine the influences the forcing frequency and amplitude have on entrainment in pulsing plumes, where the flow rate, momentum and buoyancy are sinusoidal functions of time. Finally, the study aims to investigate the validity of the integral model for pure plumes with constant source conditions established by Morton et al. (Proc R Soc Lond A 234(1196):1–23, 1956) in pulsing plumes, as well as the virtual origin correction method for lazy plumes proposed by Hunt and Kaye (J Fluid Mech 435:377–396, 2001) in both constant source plumes and pulsing plumes. Experiments were conducted to verify the pulses in pulsing plumes. Plumes are formed by issuing saline fluid downwards into a less dense uniform environment from a round pipe. The pulsing flow is generated by a programmable ISMATEC gear pump. The evolution of the pulses in pulsing plumes is revealed by applying the light-attenuation method with high frequency imaging. Pulsing is shown to affect the development of the flow, as the forcing frequency at the source dominates the frequency of the flow downstream. To study the bulk entrainment in pulsing plumes, turbulent axisymmetric lazy plumes with constant source conditions were examined initially. The bulk dilution and entrainment measurements were achieved by using the experimental approach of Hunt and Kaye (J Fluid Mech 435:377–396, 2001). The integral relationship for the local flow rate Q(z) and local momentum M(z) from the model established by Morton et al. (Proc R Soc Lond A 234(1196):1–23, 1956) for constant source plumes was used to determine the average local entrainment. Experiments with pulsing plumes were carried out with a flow rate amplitude ranged from 33% to 80% and the non-dimensional frequency - Strouhal number 〖St=fD/U〗_0 ranged from 0.012 to 1.2, where the maximum frequency f of this pulsing plume is in the order of the eddy turnover time scale at the source, D is the source diameter and U_0 is the average velocity at the source. The entrainment coefficient was determined in pulsing plumes and was found within the range of the entrainment values in plumes with constant source conditions. The influence of the forcing frequency and amplitude is examined, and found to be very small over the entire range of source conditions considered. The virtual origin correction method of Hunt and Kaye (J Fluid Mech 435:377–396, 2001) is found to give a reasonably good estimation in predicting the virtual origin in pulsing plumes. The results suggest that the local entrainment velocity is proportional to the time-average local plume velocity even in pulsing plumes where the local velocity is varying with time. This supports the application of the integral model of Morton et al. (Proc R Soc Lond A 234(1196):1–23, 1956) to building ventilation problems and environmental flows where these conditions exist.

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Lee, Jong-Sik. "Time-varying filter modelling and time-frequency characterisation of non-stationary sound fields due to a moving source." Thesis, University of Southampton, 1989. https://eprints.soton.ac.uk/52248/.

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This thesis deals with the problems of modelling, interpretation and estimation of `non-stationary' processes with particular reference to acoustic problems. A common assumption in the modelling and analysis of a random process is that the process is `stationary'. Such an assumption may be a satisfactory approximation in many instances, but there are situations in which the processes are obviously non-stationary. In particular many physical non-stationary processes exhibit a `frequency-modulated' structure. An important example of such processes is the sound perceived by an observer due to a moving source emitting a random signal. In the thesis two methods are studied for the characterisation of such non-stationary processes; i) `time-frequency' spectral characterisation and ii) time-varying filter modelling. Two major candidates for `time-frequency' (time-varying) spectral characterisation of non-stationary processes are the Wigner-Ville spectrum and Priestley's evolutionary spectrum. Properties, prediction and estimation of the two time-frequency spectra and the relation between them are discussed. The time-frequency spectra of the sound field due to a moving source are predicted and these spectra are used as the basis for estimation of the acoustic directionality pattern of the source. As to the time-varying filter modelling of such non-stationary processes, a technique called the `covariance-equivalent' method is discussed. The covariance-equivalent technique is used to model the sound field due to a moving source emitting a random signal in single-path/single-sensor cases. The covariance-equivalent method, which has only been applicable to single-component processes, is extended to include the sound field in multi-path/multi-sensor cases by using the concept of the complex envelope (complex process). Finally estimation problems of practical importance, including that of (i) the source acoustic directionality pattern and (ii) time-varying delay estimation problems, are formulated and solved in terms of the covariance-equivalent models, and simulation studies are also performed. The simulation results justify that the covariance-equivalent method is an effective characterisation of such non-stationary processes.

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Sun, Xiaole, Ivan B. Djordjevic, and Mark A. Neifeld. "Secret Key Rates and Optimization of BB84 and Decoy State Protocols Over Time-Varying Free-Space Optical Channels." IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2016. http://hdl.handle.net/10150/621687.

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We optimize secret key rates (SKRs) of weak coherent pulse (WCP)-based quantum key distribution (QKD) over time-varying free-space optical channels affected by atmospheric turbulence. The random irradiance fluctuation due to scintillation degrades the SKR performance of WCP-based QKD, and to improve the SKR performance, we propose an adaptive scheme in which transmit power is changed in accordance with the channel state information. We first optimize BB84 and decoy state-based QKD protocols for different channel transmittances. We then present our adaptation method, to overcome scintillation effects, of changing the source intensity based on channel state predictions from a linear autoregressive model while ensuring the security against the eavesdropper. By simulation, we demonstrate that by making the source adaptive to the time-varying channel conditions, SKRs of WCP-based QKD can be improved up to over 20%.

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Heaton, Matthew J. "Temporally Correlated Dirichlet Processes in Pollution Receptor Modeling." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1861.pdf.

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De, Santis Massimiliano. "Time-varying risk premia, sources of macroeconomic risk, and aggregate stock market behavior /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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Nguyen, Linh Trung. "Estimation and separation of linear frequency- modulated signals in wireless communications using time - frequency signal processing." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15984/.

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Signal processing has been playing a key role in providing solutions to key problems encountered in communications, in general, and in wireless communications, in particular. Time-Frequency Signal Processing (TFSP) provides eective tools for analyzing nonstationary signals where the frequency content of signals varies in time as well as for analyzing linear time-varying systems. This research aimed at exploiting the advantages of TFSP, in dealing with nonstationary signals, into the fundamental issues of signal processing, namely the signal estimation and signal separation. In particular, it has investigated the problems of (i) the Instantaneous Frequency (IF) estimation of Linear Frequency-Modulated (LFM) signals corrupted in complex-valued zero-mean Multiplicative Noise (MN), and (ii) the Underdetermined Blind Source Separation (UBSS) of LFM signals, while focusing onto the fast-growing area of Wireless Communications (WCom). A common problem in the issue of signal estimation is the estimation of the frequency of Frequency-Modulated signals which are seen in many engineering and real-life applications. Accurate frequency estimation leads to accurate recovery of the true information. In some applications, the random amplitude modulation shows up when the medium is dispersive and/or when the assumption of point target is not valid; the original signal is considered to be corrupted by an MN process thus seriously aecting the recovery of the information-bearing frequency. The IF estimation of nonstationary signals corrupted by complex-valued zero-mean MN was investigated in this research. We have proposed a Second-Order Statistics approach, rather than a Higher-Order Statistics approach, for IF estimation using Time-Frequency Distributions (TFDs). The main assumption was that the autocorrelation function of the MN is real-valued but not necessarily positive (i.e. the spectrum of the MN is symmetric but does not necessary has the highest peak at zero frequency). The estimation performance was analyzed in terms of bias and variance, and compared between four dierent TFDs: Wigner-Ville Distribution, Spectrogram, Choi-Williams Distribution and Modified B Distribution. To further improve the estimation, we proposed to use the Multiple Signal Classification algorithm and showed its better performance. It was shown that the Modified B Distribution performance was the best for Signal-to-Noise Ratio less than 10dB. In the issue of signal separation, a new research direction called Blind Source Separation (BSS) has emerged over the last decade. BSS is a fundamental technique in array signal processing aiming at recovering unobserved signals or sources from observed mixtures exploiting only the assumption of mutual independence between the signals. The term "blind" indicates that neither the structure of the mixtures nor the source signals are known to the receivers. Applications of BSS are seen in, for example, radar and sonar, communications, speech processing, biomedical signal processing. In the case of nonstationary signals, a TF structure forcing approach was introduced by Belouchrani and Amin by defining the Spatial Time- Frequency Distribution (STFD), which combines both TF diversity and spatial diversity. The benefit of STFD in an environment of nonstationary signals is the direct exploitation of the information brought by the nonstationarity of the signals. A drawback of most BSS algorithms is that they fail to separate sources in situations where there are more sources than sensors, referred to as UBSS. The UBSS of nonstationary signals was investigated in this research. We have presented a new approach for blind separation of nonstationary sources using their TFDs. The separation algorithm is based on a vector clustering procedure that estimates the source TFDs by grouping together the TF points corresponding to "closely spaced" spatial directions. Simulations illustrate the performances of the proposed method for the underdetermined blind separation of FM signals. The method developed in this research represents a new research direction for solving the UBSS problem. The successful results obtained in the research development of the above two problems has led to a conclusion that TFSP is useful for WCom. Future research directions were also proposed.

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Nguyen, Linh-Trung. "Estimation and separation of linear frequency- modulated signals in wireless communications using time - frequency signal processing." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15984/1/Nguyen_Linh-Trung_Thesis.pdf.

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Signal processing has been playing a key role in providing solutions to key problems encountered in communications, in general, and in wireless communications, in particular. Time-Frequency Signal Processing (TFSP) provides eective tools for analyzing nonstationary signals where the frequency content of signals varies in time as well as for analyzing linear time-varying systems. This research aimed at exploiting the advantages of TFSP, in dealing with nonstationary signals, into the fundamental issues of signal processing, namely the signal estimation and signal separation. In particular, it has investigated the problems of (i) the Instantaneous Frequency (IF) estimation of Linear Frequency-Modulated (LFM) signals corrupted in complex-valued zero-mean Multiplicative Noise (MN), and (ii) the Underdetermined Blind Source Separation (UBSS) of LFM signals, while focusing onto the fast-growing area of Wireless Communications (WCom). A common problem in the issue of signal estimation is the estimation of the frequency of Frequency-Modulated signals which are seen in many engineering and real-life applications. Accurate frequency estimation leads to accurate recovery of the true information. In some applications, the random amplitude modulation shows up when the medium is dispersive and/or when the assumption of point target is not valid; the original signal is considered to be corrupted by an MN process thus seriously aecting the recovery of the information-bearing frequency. The IF estimation of nonstationary signals corrupted by complex-valued zero-mean MN was investigated in this research. We have proposed a Second-Order Statistics approach, rather than a Higher-Order Statistics approach, for IF estimation using Time-Frequency Distributions (TFDs). The main assumption was that the autocorrelation function of the MN is real-valued but not necessarily positive (i.e. the spectrum of the MN is symmetric but does not necessary has the highest peak at zero frequency). The estimation performance was analyzed in terms of bias and variance, and compared between four dierent TFDs: Wigner-Ville Distribution, Spectrogram, Choi-Williams Distribution and Modified B Distribution. To further improve the estimation, we proposed to use the Multiple Signal Classification algorithm and showed its better performance. It was shown that the Modified B Distribution performance was the best for Signal-to-Noise Ratio less than 10dB. In the issue of signal separation, a new research direction called Blind Source Separation (BSS) has emerged over the last decade. BSS is a fundamental technique in array signal processing aiming at recovering unobserved signals or sources from observed mixtures exploiting only the assumption of mutual independence between the signals. The term "blind" indicates that neither the structure of the mixtures nor the source signals are known to the receivers. Applications of BSS are seen in, for example, radar and sonar, communications, speech processing, biomedical signal processing. In the case of nonstationary signals, a TF structure forcing approach was introduced by Belouchrani and Amin by defining the Spatial Time- Frequency Distribution (STFD), which combines both TF diversity and spatial diversity. The benefit of STFD in an environment of nonstationary signals is the direct exploitation of the information brought by the nonstationarity of the signals. A drawback of most BSS algorithms is that they fail to separate sources in situations where there are more sources than sensors, referred to as UBSS. The UBSS of nonstationary signals was investigated in this research. We have presented a new approach for blind separation of nonstationary sources using their TFDs. The separation algorithm is based on a vector clustering procedure that estimates the source TFDs by grouping together the TF points corresponding to "closely spaced" spatial directions. Simulations illustrate the performances of the proposed method for the underdetermined blind separation of FM signals. The method developed in this research represents a new research direction for solving the UBSS problem. The successful results obtained in the research development of the above two problems has led to a conclusion that TFSP is useful for WCom. Future research directions were also proposed.

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Balfoussia, Chiona. "Observable and latent macroeconomic sources of time-varying bond risk premia and their significance in modelling inflation." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431576.

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Lee, Sang Gu. "Integrating Data from Multiple Sources to Estimate Transit-Land Use Interactions and Time-Varying Transit Origin-Destination Demand." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/265832.

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This research contributes to a very active body of literature on the application of Automated Data Collection Systems (ADCS) and openly shared data to public transportation planning. It also addresses the interaction between transit demand and land use patterns, a key component of generating time-varying origin-destination (O-D) matrices at a route level. An origin-destination (O-D) matrix describes the travel demand between two different locations and is indispensable information for most transportation applications, from strategic planning to traffic control and management. A transit passenger's O-D pair at the route level simply indicates the origin and destination stop along the considered route. Observing existing land use types (e.g., residential, commercial, institutional) within the catchment area of each stop can help in identifying existing transit demand at any given time or over time. The proposed research addresses incorporation of an alighting probability matrix (APM) - tabulating the probabilities that a passenger alights at stops downstream of the boarding at a specified stop - into a time-varying O-D estimation process, based on the passenger's trip purpose or activity locations represented by the interactions between transit demand and land use patterns. In order to examine these interactions, this research also uses a much larger dataset that has been automatically collected from various electronic technologies: Automated Fare Collection (AFC) systems and Automated Passenger Counter (APC) systems, in conjunction with other readily available data such as Google's General Transit Feed Specification (GTFS) and parcel-level land use data. The large and highly detailed datasets have the capability of rectifying limitations of manual data collection (e.g., on-board survey) as well as enhancing any existing decision-making tools. This research proposes use of Google's GTFS for a bus stop aggregation model (SAM) based on distance between individual stops, textual similarity, and common service areas. By measuring land use types within a specified service area based on SAM, this research helps in advancing our understanding of transit demand in the vicinity of bus stops. In addition, a systematic matching technique for aggregating stops (SAM) allows us to analyze the symmetry of boarding and alightings, which can observe a considerable passenger flow between specific time periods and symmetry by time period pairs (e.g., between AM and PM peaks) on an individual day. This research explores the potential generation of a time-varying O-D matrix from APC data, in conjunction with integrated land use and transportation models. This research aims at incorporating all valuable information - the time-varying alighting probability matrix (TAPM) that represents on-board passengers' trip purpose - into the O-D estimation process. A practical application is based on APC data on a specific transit route in the Minneapolis - St. Paul metropolitan area. This research can also provide other practical implications. It can help transit agencies and policy makers to develop decision-making tools to support transit planning, using improved databases with transit-related ADCS and parcel-level land use data. As a result, this work not only has direct implications for the design and operation of future urban public transport systems (e.g., more precise bus scheduling, improve service to public transport users), but also for urban planning (e.g., for transit oriented urban development) and travel forecasting.

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Books on the topic "Time-varying source"

1

Chang-Jin, Kim. Sources of monetary growth uncertainty and economic activity: The time-varying-parameter model with heteroskedasticity in the disturbance terms. [Toronto, Ont: York University, Dept. of Economics, 1990.

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Chappell, Dave. Waterflooding: Design and Development. Society of Petroleum EngineersRichardson, Texas, USA, 2020. http://dx.doi.org/10.2118/9781613998021.

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Used successfully for more than a century, waterflooding remains the most widely performed process relying on an external energy source to maximize reservoir recovery. Multiple factors across a wide range of disciplines contribute to the delivery of a fully optimized project, but not all of these critical success factors have been well-documented. A focus on further optimizing all the varying parts of the process has emerged over time to deliver project success. Waterflooding: Design and Development reviews the factors that can contribute to poor waterflood performance and considers how they can be properly managed.

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Chappell, Dave. Waterflooding: Chemistry. Society of Petroleum EngineersRichardson, Texas, USA, 2020. http://dx.doi.org/10.2118/9781613997949.

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Used successfully for more than a century, waterflooding remains the most widely performed process relying on an external energy source to maximize reservoir recovery. Multiple factors across a wide range of disciplines contribute to the delivery of a fully optimized project, but not all of these critical success factors have been well-documented. A focus on further optimizing all the varying parts of the process has emerged over time to deliver project success. Waterflooding: Chemistry explores in detail the significant impacts that chemistry-related issues can have on the progress of waterflood projects.

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Chappell, Dave. Waterflooding: Facilities and Operations. Society of Petroleum EngineersRichardson, Texas, USA, 2020. http://dx.doi.org/10.2118/9781613998106.

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Used successfully for more than a century, waterflooding remains the most widely performed process relying on an external energy source to maximize reservoir recovery. Multiple factors across a wide range of disciplines contribute to the delivery of a fully optimized project, but not all of these critical success factors have been well-documented. A focus on further optimizing all the varying parts of the process has emerged over time to deliver project success. Waterflooding: Facilities and Operations looks at the design of injection and production systems and how they influence success in waterflooding.

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Chappell, Dave. Waterflooding: Surveillance and Remediation. Society of Petroleum EngineersRichardson, Texas, USA, 2020. http://dx.doi.org/10.2118/9781613998069.

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Used successfully for more than a century, waterflooding remains the most widely performed process relying on an external energy source to maximize reservoir recovery. Multiple factors across a wide range of disciplines contribute to the delivery of a fully optimized project, but not all of these critical success factors have been well-documented. A focus on further optimizing all the varying parts of the process has emerged over time to deliver project success. Waterflooding: Surveillance and Remediation describes the various elements that could be included as components in a waterflood-management surveillance plan and reviews the options available to improve flood performance.

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Chappell, Dave. Waterflooding: Injection Regime and Injection Wells. Society of Petroleum EngineersRichardson, Texas, USA, 2020. http://dx.doi.org/10.2118/9781613997987.

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Used successfully for more than a century, waterflooding remains the most widely performed process relying on an external energy source to maximize reservoir recovery. Multiple factors across a wide range of disciplines contribute to the delivery of a fully optimized project, but not all of these critical success factors have been well-documented. A focus on further optimizing all the varying parts of the process has emerged over time to deliver project success. Waterflooding: Injection Regime and Injection Wells explores the benefits and drawbacks of both matrix and fractured injection and reviews the impacts that these injection regimes can have on waterflood performance.

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Sovacool, Benjamin K. The History and Politics of Energy Transitions. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198802242.003.0002.

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According to some definitions, an energy transition refers to the time that elapses between the introduction of a new primary energy source, or prime mover, and its rise to claiming a substantial share of the overall energy market. According to one academic view, energy transitions take an incredibly long time to occur. Another view argues the opposite. It suggests that there have been many transitions at varying scales that have occurred quite quickly—that is, between a few years and a decade or so, or within a single generation. This chapter holds that both sides are partly right, and partly wrong. After presenting evidence in support of either thesis, it elucidates four lessons for energy analysts and policymakers.

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Bachleitner, Kathrin. Collective Memory in International Relations. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192895363.001.0001.

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This book traces the influence of collective memory in international relations (IR). It inquires where a country’s memory first emerges and how it guides states through time in world politics. It locates the origins of national memory in political strategies within the international environment. The study then turns to the domestic landscape, where among a country’s public, it finds memory to be the carrier of national identity over time. From there, however, the analysis reverts to the international sphere: in the medium term, collective memory begins to channel international state behaviour, whereas, in the long run, it circumvents a country’s normative horizons. In this book, collective memory is thus assumed to become manifest in world politics in four varying forms: as a country’s political strategy, as its public identity, as underwriting its international state behaviour, and finally, as a source for its national values. All four theorized manifestations of memory are tested in a comparative study of (West) Germany and Austria and the impact their diverse post-war interpretations of the Nazi legacy had on their international policies over time. With the illustrative help of the empirical cases, the book not only explores whether collective memory has an influence on political outcomes but how and why it matters for IR.

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Haesemeyer, Christian, and Charles A. Weibel. The Norm Residue Theorem in Motivic Cohomology. Princeton University Press, 2019. http://dx.doi.org/10.23943/princeton/9780691191041.001.0001.

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This book presents the complete proof of the Bloch–Kato conjecture and several related conjectures of Beilinson and Lichtenbaum in algebraic geometry. Brought together here for the first time, these conjectures describe the structure of étale cohomology and its relation to motivic cohomology and Chow groups. Although the proof relies on the work of several people, it is credited primarily to Vladimir Voevodsky. The book draws on a multitude of published and unpublished sources to explain the large-scale structure of Voevodsky's proof and introduces the key figures behind its development. It proceeds to describe the highly innovative geometric constructions of Markus Rost, including the construction of norm varieties, which play a crucial role in the proof. It then addresses symmetric powers of motives and motivic cohomology operations. The book unites various components of the proof that until now were scattered across many sources of varying accessibility, often with differing hypotheses, definitions, and language.

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Book chapters on the topic "Time-varying source"

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Jiang, Jiaojiao, Sheng Wen, Shui Yu, Bo Liu, Yang Xiang, and Wanlei Zhou. "Identifying Propagation Source in Time-Varying Networks." In Malicious Attack Propagation and Source Identification, 117–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02179-5_10.

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Musafere, F., A. Sadhu, and K. Liu. "Time-Varying System Identification Using a Hybrid Blind Source Separation Method." In Structural Health Monitoring, Damage Detection & Mechatronics, Volume 7, 99–104. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29956-3_11.

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Rueda, Luis, and B. John Oommen. "On Families of New Adaptive Compression Algorithms Suitable for Time-Varying Source Data." In Advances in Information Systems, 234–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30198-1_24.

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Shah, Sanil, and Ajit Kumar Parwani. "Estimation of Time-Varying Heat Source for One-Dimensional Heat Conduction by Conjugate Gradient Method." In Advances in Intelligent Systems and Computing, 329–39. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1966-2_29.

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Reames, Donald V. "Gradual SEP Events." In Solar Energetic Particles, 97–133. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66402-2_5.

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AbstractGradual solar energetic-particle (SEP) events are “big proton events” and are usually much more “gradual” in their decay than in their onset. As their intensities increase, particles streaming away from the shock amplify Alfvén waves that scatter subsequent particles, increasing their acceleration, eventually limiting ion flow at the “streaming limit.” Waves generated by higher-speed protons running ahead can also throttle the flow of lower-energy ions, flattening spectra and altering abundances in the biggest SEP events. Thus, we find that the A/Q-dependence of scattering causes element-abundance patterns varying in space and time, which define source-plasma temperatures T, since the pattern of Q values of the ions depends upon temperature. Differences in T explain much of the variation of element abundances in gradual SEP events. In nearly 70% of gradual events, SEPs are shock-accelerated from ambient coronal plasma of ~0.8–1.6 MK, while 24% of the events involve material with T ≈ 2–4 MK re-accelerated from residual impulsive-suprathermal ions with pre-enhanced abundances. This source-plasma temperature can occasionally vary with solar longitude across the face of a shock. Non-thermal variations in ion abundances in gradual SEP events reaccelerated from the 2–4 MK impulsive source plasma are reduced, relative to those in the original impulsive SEPs, probably because the accelerating shock waves sample a pool of ions from multiple jet sources. Late in gradual events, SEPs become magnetically trapped in a reservoir behind the CME where spectra are uniform in space and decrease adiabatically in time as the magnetic bottle containing them slowly expands. Finally, we find variations of the He/O abundance ratio in the source plasma of different events.

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Choudhuri, Arnab Rai. "Electromagnetic Fields of Time-Varying Sources." In Advanced Electromagnetic Theory, 187–206. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5944-8_6.

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Ouellette, Nadine, France Meslé, Jacques Vallin, and Jean-Marie Robine. "Supercentenarians and Semi-supercentenarians in France." In Demographic Research Monographs, 105–23. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49970-9_9.

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AbstractThe purpose of this study is twofold. Firstly, it attempts to exhaustively identify cases of French supercentenarians and semi-supercentenarians and to validate their alleged age at death. Secondly, it seeks to uncover careful patterns and trends in probabilities of death and life expectancy at very old ages in France. We use three sets of data with varying degrees of accuracy and coverage: nominative transcripts from the RNIPP (Répertoire national d’identification des personnes physiques), death records from the vital statistics system, and “public” lists of individual supercentenarians. The RNIPP stands out as the most reliable source. Based on all deaths registered in the RNIPP at the alleged ages of 110+ for extinct cohorts born between 1883 and 1901, errors are only few, at least for individuals who were born and died in France. For alleged semi-supercentenarians, age validation on a very large sample shows that errors are extremely rare, suggesting the RNIPP data can be used without any verification until age 108 at the minimum. Moreover, a comparison with “public” lists of individual supercentenarians reveals a single missing occurrence only in the RNIPP transcripts since 1991. While the quality of vital statistics data remains quite deficient at very old ages compared to RNIPP, the analytical results show a significant improvement over time at younger old ages. Our RNIPP-based probabilities of death for females appear to level-off at 0.5 between ages 108 and 111, but data becomes too scarce afterwards to assess the trend. Also, we obtain a quite low life expectancy value of 1.2 years at age 108.

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Cheng, Yougan, Ronny Straube, Abed E. Alnaif, Lu Huang, Tarek A. Leil, and Brian J. Schmidt. "Virtual Populations for Quantitative Systems Pharmacology Models." In Methods in Molecular Biology, 129–79. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2265-0_8.

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AbstractQuantitative systems pharmacology (QSP) places an emphasis on dynamic systems modeling, incorporating considerations from systems biology modeling and pharmacodynamics. The goal of QSP is often to quantitatively predict the effects of clinical therapeutics, their combinations, and their doses on clinical biomarkers and endpoints. In order to achieve this goal, strategies for incorporating clinical data into model calibration are critical. Virtual population (VPop) approaches facilitate model calibration while faced with challenges encountered in QSP model application, including modeling a breadth of clinical therapies, biomarkers, endpoints, utilizing data of varying structure and source, capturing observed clinical variability, and simulating with models that may require more substantial computational time and resources than often found in pharmacometrics applications. VPops are frequently developed in a process that may involve parameterization of isolated pathway models, integration into a larger QSP model, incorporation of clinical data, calibration, and quantitative validation that the model with the accompanying, calibrated VPop is suitable to address the intended question or help with the intended decision. Here, we introduce previous strategies for developing VPops in the context of a variety of therapeutic and safety areas: metabolic disorders, drug-induced liver injury, autoimmune diseases, and cancer. We introduce methodological considerations, prior work for sensitivity analysis and VPop algorithm design, and potential areas for future advancement. Finally, we give a more detailed application example of a VPop calibration algorithm that illustrates recent progress and many of the methodological considerations. In conclusion, although methodologies have varied, VPop strategies have been successfully applied to give valid clinical insights and predictions with the assistance of carefully defined and designed calibration and validation strategies. While a uniform VPop approach for all potential QSP applications may be challenging given the heterogeneity in use considerations, we anticipate continued innovation will help to drive VPop application for more challenging cases of greater scale while developing new rigorous methodologies and metrics.

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Kumar, Divesh, and Satish Kansal. "Allocation of Different Types of DG Sources in a Time-Varying Radial Distribution Networks." In Cognitive Informatics and Soft Computing, 49–60. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8763-1_5.

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Zugmeyer, O., and J. P. Le Cadre. "A MULTISCALE TIME-VARYING APPROACH TO MOVING SOURCE TRACKING." In Adaptive Systems in Control and Signal Processing 1992, 481–86. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-08-041717-2.50082-3.

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Conference papers on the topic "Time-varying source"

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Nguyen, Thinh, Tom Potter, Christof Karmonik, Robert Grossman, and Yingchun Zhang. "EEG source localization constrained by time varying fMRI." In 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7318441.

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Krishna Priya G. S., Santanu Bandyopadhyay, and Harish Pillai. "Optimum source sizing to satisfy time varying demand." In 2014 2nd International Conference on Green Energy and Technology (ICGET). IEEE, 2014. http://dx.doi.org/10.1109/icget.2014.6966660.

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Aguerri, Inaki Estella, and Deniz Gunduz. "Wireless source transmission with time-varying side information." In 2011 International Symposium of Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks (WiOpt). IEEE, 2011. http://dx.doi.org/10.1109/wiopt.2011.5930043.

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Chen, Fangzhou, Bin Li, and Can Emre Koksal. "Low-delay distributed source coding for time-varying sources with unknown statistics." In IEEE INFOCOM 2015 - IEEE Conference on Computer Communications. IEEE, 2015. http://dx.doi.org/10.1109/infocom.2015.7218447.

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Vielva, Erdogmus, Pantaleon, Santamaria, Pereda, and Principe. "Underdetermined blind source separation in a time-varying environment." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1005330.

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Vielva, L., D. Erdogmus, C. Pantaleon, I. Santamaria, J. Pereda, and J. C. Principe. "Underdetermined blind source separation in a time-varying environment." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745292.

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Aguerri, Inaki Estella, and Deniz Gunduz. "Systematic lossy source transmission over Gaussian time-varying channels." In 2013 IEEE International Symposium on Information Theory (ISIT). IEEE, 2013. http://dx.doi.org/10.1109/isit.2013.6620176.

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DeYoung, Marcus R., and Brian L. Evans. "Blind Source Separation with a Time-Varying Mixing Matrix." In 2007 41st Asilomar conference on Signals, Systems and Computers (ACSSC). IEEE, 2007. http://dx.doi.org/10.1109/acssc.2007.4487289.

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Al-Momani, Sajedah, Hasan S. Mir, and Hasan Al-Nashash. "Epileptogenic Foci Time Varying Source Loca1ization Using Source Affine Image Reconstruction (SAFFIRE) Algorithm." In 2019 IEEE Jordan International Joint Conference on Electrical Engineering and Information Technology (JEEIT). IEEE, 2019. http://dx.doi.org/10.1109/jeeit.2019.8717487.

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Rubega, M., D. Pascucci, J. Rue Queralt, P. Van Mierlo, P. Hagmann, G. Plomp, and C. M. Michel. "Time-varying effective EEG source connectivity: the optimization of model parameters*." In 2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2019. http://dx.doi.org/10.1109/embc.2019.8856890.

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Reports on the topic "Time-varying source"

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Amin, Moeness. Classification and Discrimination of Sources with Time-Varying Frequency and Spatial Spectra. Fort Belvoir, VA: Defense Technical Information Center, October 2002. http://dx.doi.org/10.21236/ada406349.

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Baral, Aniruddha, Jeffery Roesler, and Junryu Fu. Early-age Properties of High-volume Fly Ash Concrete Mixes for Pavement: Volume 2. Illinois Center for Transportation, September 2021. http://dx.doi.org/10.36501/0197-9191/21-031.

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High-volume fly ash concrete (HVFAC) is more cost-efficient, sustainable, and durable than conventional concrete. This report presents a state-of-the-art review of HVFAC properties and different fly ash characterization methods. The main challenges identified for HVFAC for pavements are its early-age properties such as air entrainment, setting time, and strength gain, which are the focus of this research. Five fly ash sources in Illinois have been repeatedly characterized through x-ray diffraction, x-ray fluorescence, and laser diffraction over time. The fly ash oxide compositions from the same source but different quarterly samples were overall consistent with most variations observed in SO3 and MgO content. The minerals present in various fly ash sources were similar over multiple quarters, with the mineral content varying. The types of carbon present in the fly ash were also characterized through x-ray photoelectron spectroscopy, loss on ignition, and foam index tests. A new computer vision–based digital foam index test was developed to automatically capture and quantify a video of the foam layer for better operator and laboratory reliability. The heat of hydration and setting times of HVFAC mixes for different cement and fly ash sources as well as chemical admixtures were investigated using an isothermal calorimeter. Class C HVFAC mixes had a higher sulfate imbalance than Class F mixes. The addition of chemical admixtures (both PCE- and lignosulfonate-based) delayed the hydration, with the delay higher for the PCE-based admixture. Both micro- and nano-limestone replacement were successful in accelerating the setting times, with nano-limestone being more effective than micro-limestone. A field test section constructed of HVFAC showed the feasibility and importance of using the noncontact ultrasound device to measure the final setting time as well as determine the saw-cutting time. Moreover, field implementation of the maturity method based on wireless thermal sensors demonstrated its viability for early opening strength, and only a few sensors with pavement depth are needed to estimate the field maturity.

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de Vries, Gaaitzen, Linda Arfelt, Dorothea Drees, Mareike Godemann, Calumn Hamilton, Bente Jessen-Thiesen, Ahmet Ihsan Kaya, Hagen Kruse, Emmanuel Mensah, and Pieter Woltjer. The Economic Transformation Database (ETD): content, sources, and methods. UNU-WIDER, 2021. http://dx.doi.org/10.35188/unu-wider/wtn/2021-2.

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This note introduces the GGDC/UNU-WIDER Economic Transformation Database (ETD), which provides time series of employment and real and nominal value added by 12 sectors in 51 countries for the period 1990–2018. The ETD includes 20 Asian, 9 Latin American, 4 Middle-East and North African, and 18 sub-Saharan African countries at varying levels of economic development. The ETD is constructed on the basis of an in-depth investigation of the availability and usability of statistical sources on a country-by-country basis. The ETD provides researchers with data to analyse the variety and determinants of structural transformation and supports policies aimed at sustained growth and poverty reduction.

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McKinnon, Mark, Craig Weinschenk, and Daniel Madrzykowski. Modeling Gas Burner Fires in Ranch and Colonial Style Structures. UL Firefighter Safety Research Institute, June 2020. http://dx.doi.org/10.54206/102376/mwje4818.

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The test scenarios ranged from fires in the structures with no exterior ventilation to room fires with flow paths that connected the fires with remote intake and exhaust vents. In the ranch, two replicate fires were conducted for each room of origin and each ventilation condition. Rooms of fire origin included the living room, bedroom, and kitchen. In the colonial, the focus was on varying the flow paths to examine the change in fire behavior and the resulting damage. No replicates were conducted in the colonial. After each fire scene was documented, the interior finish and furnishings were replaced in affected areas of the structure. Instrumentation was installed to measure gas temperature, gas pressure, and gas movement within the structures. In addition, oxygen sensors were installed to determine when a sufficient level of oxygen was available for flaming combustion. Standard video and firefighting IR cameras were also installed inside of the structures to capture information about the fire dynamics of the experiments. Video cameras were also positioned outside of the structures to monitor the flow of smoke, flames, and air at the exterior vents. Each of the fires were started from a small flaming source. The fires were allowed to develop until they self-extinguished due to a lack of oxygen or until the fire had transitioned through flashover. The times that fires burned post-flashover varied based on the damage occurring within the structure. The goal was have patterns remaining on the ceiling, walls, and floors post-test. In total, thirteen experiments were conducted in the ranch structure and eight experiments were conducted in the colonial structure. All experiments were conducted at UL's Large Fire Laboratory in Northbrook, IL. Increasing the ventilation available to the fire, in both the ranch and the colonial, resulted in additional burn time, additional fire growth, and a larger area of fire damage within the structures. These changes are consistent with fire dynamics based assessments and were repeatable. Fire patterns within the room of origin led to the area of origin when the ventilation of the structure was considered. Fire patterns generated pre-flashover, persisted post-flashover if the ventilation points were remote from the area of origin.

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Global Education Monitoring Report - Non-state actors in education: Who chooses? Who loses? UNESCO, December 2021. http://dx.doi.org/10.54676/ytjt5864.

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Non-state actors’ role extends beyond provision of schooling to interventions at various education levels and influence spheres. Alongside its review of progress towards SDG 4, including emerging evidence on the COVID-19 pandemic’s impact, the 2021/2 Global Education Monitoring Report urges governments to see all institutions, students and teachers as part of a single system. Standards, information, incentives and accountability should help governments protect, respect and fulfil the right to education of all, without turning their eyes away from privilege or exploitation. Publicly funded education does not have to be publicly provided but disparity in education processes, student outcomes and teacher working conditions must be addressed. Efficiency and innovation, rather than being commercial secrets, should be diffused and practised by all. To that end, transparency and integrity in the public education policy process need to be maintained to block vested interests. The report’s rallying call – Who chooses? Who loses? – invites policymakers to question relationships with non-state actors in terms of fundamental choices: between equity and freedom of choice; between encouraging initiative and setting standards; between groups of varying means and needs; between immediate commitments under SDG 4 and those to be progressively realized (e.g. post-secondary education); and between education and other social sectors. Supporting the fifth Global Education Monitoring Report are two online tools: PEER, a policy dialogue resource describing non-state activity and regulations in the world’s education systems; and VIEW, a new website consolidating sources and providing new completion rate estimates over time.

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