Relevant bibliographies by topics / Single phase sampling

Academic literature on the topic 'Single phase sampling'

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Published: 8 September 2023

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Journal articles on the topic "Single phase sampling"

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Arun, K., and K. Selvajyothi. "Single Phase Variable Sampling Phase Locked Loop using Composite Observer." Indonesian Journal of Electrical Engineering and Computer Science 2, no. 1 (April 1, 2016): 49. http://dx.doi.org/10.11591/ijeecs.v2.i1.pp49-60.

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<p>An observer based variable sampling period phase locked loop is introduced for grid connected systems. The composite observer acts as an efficient estimator of the fundamental components from a periodic input signal rich in DC and harmonics. The observer gains are designed using pole placement technique, which inherently ensures the stability of this estimator. Even under drift frequency, a constant number of samples (512) per cycle are maintained with the help of the numerically controlled oscillator. This makes the oscillator gain elements in the observer a constant and eliminates the trigonometric computation. This phase locked loop is found to be working in a wide range of frequency 40 – 70Hz. The performance of the proposed scheme is studied with a synthetic harmonic rich signal as well as validated by implementing the PLL in Cyclone IV FPGA with a real time grid voltage.</p>
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Hu, Xinyao, Hao Zhang, Qian Zhao, Panpan Yu, Yinmei Li, and Lei Gong. "Single-pixel phase imaging by Fourier spectrum sampling." Applied Physics Letters 114, no. 5 (February 4, 2019): 051102. http://dx.doi.org/10.1063/1.5087174.

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Shields, Taylor, Adetunmise C. Dada, Lennart Hirsch, Seungjin Yoon, Jonathan M. R. Weaver, Daniele Faccio, Lucia Caspani, Marco Peccianti, and Matteo Clerici. "Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors." Sensors 22, no. 23 (December 2, 2022): 9432. http://dx.doi.org/10.3390/s22239432.

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Electro-optical sampling of Terahertz fields with ultrashort pulsed probes is a well-established approach for directly measuring the electric field of THz radiation. This technique usually relies on balanced detection to record the optical phase shift brought by THz-induced birefringence. The sensitivity of electro-optical sampling is, therefore, limited by the shot noise of the probe pulse, and improvements could be achieved using quantum metrology approaches using, e.g., NOON states for Heisenberg-limited phase estimation. We report on our experiments on THz electro-optical sampling using single-photon detectors and a weak squeezed vacuum field as the optical probe. Our approach achieves field sensitivity limited by the probe state statistical properties using phase-locked single-photon detectors and paves the way for further studies targeting quantum-enhanced THz sensing.
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Sud, U. C., Hukum Chandra, and V. K. Gupta. "Calibration-Based Product Estimator in Single- and Two-Phase Sampling." Journal of Statistical Theory and Practice 8, no. 1 (December 23, 2013): 1–11. http://dx.doi.org/10.1080/15598608.2014.840487.

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Ri, Shien, Takashi Muramatsu, and Masumi Saka. "A Phase Compensation Technique of Sampling Moiré Method for Accurate Single-Shot Phase Analysis." Applied Mechanics and Materials 70 (August 2011): 243–48. http://dx.doi.org/10.4028/www.scientific.net/amm.70.243.

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Recently, a technique for fast and accurate phase analysis called sampling moiré method has been developed for measurement of small-displacement distribution. In this study, a distribution of phase error caused by linear interpolation in case with mismatch between the sampling pitch and the grating pitch is theoretically analyzed. Moreover, a technique for effective phase compensation is proposed to reduce the periodic phase error. The performance of our compensation method is validated by a computer simulation. Phase analysis can be performed more accurately even in the case that the sampling pitch does not match to the grating pitch strictly.
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Parker, Robert C., and David L. Evans. "LiDAR Forest Inventory with Single-Tree, Double-, and Single-Phase Procedures." International Journal of Forestry Research 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/864108.

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Light Detection and Ranging (LiDAR) data at 0.5–2 m postings were used with double-sample, stratified procedures involving single-tree relationships in mixed, and single species stands to yield sampling errors ranging from % to %. LiDAR samples were selected with focal filter procedures and heights computed from interpolated canopy and DEM surfaces. Tree dbh and height data were obtained at various ratios of LiDAR, ground samples for DGPS located ground plots. Dbh-height and ground-LiDAR height models were used to predict dbh and compute Phase 2 estimates of basal area and volume. Phase 1 estimates were computed using the species probability distribution from ground plots in each strata. Phase 2 estimates were computed by randomly assigning LiDAR heights to species groups using a Monte Carlo simulation for each ground plot. There was no statistical difference between volume estimates from 0.5 m and 1 m LiDAR densities. Volume estimates from single-phase LiDAR procedures utilizing existing tree attributes and height bias relationships were obtained with sampling errors of 1.8% to 5.5%.
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Dar, Amber Yousaf, Nadia Saeed, Moustafa Omar Ahmed Abu-Shawiesh, Saman Hanif Shahbaz, and Muhammad Qaiser Shahbaz. "A new class of ratio type estimators in single- and two-phase sampling." AIMS Mathematics 7, no. 8 (2022): 14208–26. http://dx.doi.org/10.3934/math.2022783.

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<abstract> <p>The estimation of a certain population characteristics is required for several situations. The estimates are built so that the error of estimation is minimized. In several situations estimation of the population mean is required. Different estimators for the mean are available but, there is still room for improvement. In this paper, a new class of ratio-type estimators is proposed for the estimation of the population mean. The estimators are proposed for single- and two-phase sampling schemes. The expressions for bias and mean square error are obtained for single-phase and two-phase sampling estimators. Mathematical comparison of the proposed estimators has been achieved by using some existing single-phase and two-phase sampling estimators. Extensive simulations have been conducted to compare the proposed estimators with some available single- and two-phase sampling estimators. It has been observed that the proposed estimators are better than the existing estimators. Consequently, the proposed ratio estimators are recommended for use by the practitioners in various fields of industry, engineering and medical and physical sciences.</p> </abstract>
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Pei, Yu Jie, Yun Shan Zhang, Jian Guo Xu, Jing Long Mu, Lei Zhang, Pin Dong, Bo Cong, and Shu Han Wang. "Implementation of Single Phase Locked Loop Based on FPGA and its Application in SVC." Advanced Materials Research 986-987 (July 2014): 1826–32. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1826.

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Whereas three-phase phase locked loop could not get accurate phase position under three-phase unbalanced condition of the power grid, the design of single phase locked loop is implemented in the principle of single phase locked loop, based on FPGA technology. the paper explains design difficulties of single phase locked loop in detail, puts forward adaptive sampling scheme using single phase locked loop under variable frequency, increases accuracy of SVC sampling system. And tests response speed of phase locked loop via Real Time Digital Simulator for Power Systems (RTDS), through final verification in Fushun Lishizhai SVC Project, the design could meet system requirement for voltage phase accuracy.
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Tang, Yaojing, Yongle Chang, Jinrui Tang, Bin Xu, Mingkang Ye, and Hongbo Yang. "A Novel Faulty Phase Selection Method for Single-Phase-to-Ground Fault in Distribution System Based on Transient Current Similarity Measurement." Energies 14, no. 15 (August 3, 2021): 4695. http://dx.doi.org/10.3390/en14154695.

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In modern electrical power distribution systems, the effective operation of inverter-based arc suppression devices relies on the accuracy of faulty phase selection. In the traditional methods of faulty phase selection for single-phase-to-ground faults (SPGs), power frequency-based amplitude and phase characteristics are used to identify the faulty phase. In the field, when a high-resistance SPG occurs in the system, traditional methods are difficult for accurately identifying the faulty phase because of the weak fault components and complicated process. A novel realizable and effective method of faulty phase selection based on transient current similarity measurements is presented when SPGs occur in resonantly grounded distribution systems in this paper. An optimized Hausdorff distance matrix (MOHD) is proposed and constructed by the transient currents of three phases’ similarity measurements within a certain time window of our method. This MOHD is used to select the sampling time window adaptively, which allows the proposed method to be applied to any scale of distribution systems. Firstly, when a SPG occurs, the expressions for the transient phase current mutation in the faulty and sound phases are analyzed. Then, the sampling process is segmented into several selection units (SUs) to form the MOHD-based faulty phase selection method. Additionally, the Hausdorff distance algorithm (HD) is used to calculate the waveform similarities of the transient phase current mutation among the three phases to form the HD-based faulty phase selection method. Finally, a practical resonant grounded distribution system is modeled in PSCAD/EMTDC, and the effectiveness and performance of the proposed method is compared and verified under different fault resistances, fault inception angles, system topologies, sampling time windows and rates of data missing.
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Kung’u, John, and Leo Odongo. "Ratio-Cum-Product Estimator Using Multiple Auxiliary Attributes in Single Phase Sampling." Open Journal of Statistics 04, no. 04 (2014): 239–45. http://dx.doi.org/10.4236/ojs.2014.44023.

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Dissertations / Theses on the topic "Single phase sampling"

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Braun, Stefan K. "Aspekte des „Samplings“." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-147027.

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Mash-Ups (auch Bootlegging, Bastard Pop oder Collage genannt) erfreuen sich seit Jahren steigender Beliebtheit. Waren es zu Beginn der 1990er Jahre meist nur 2 unterschiedliche Popsongs, deren Gesangs- und Instrumentenspuren in Remixform ineinander gemischt wurden, existieren heute Multi-Mash-Ups mit mehreren Dutzend gemixten und gesampelten Songs, Interpreten, Videosequenzen und Effekten. Eine Herausforderung stellt die Kombination unterschiedlichster Stile dar, diese zu neuen tanzbaren Titeln aus den Charts zu mischen. Das Mash-Up Projekt Pop Danthology z.B. enthält in einem knapp 6 minütigen aktuellen Musikclip 68 verschiedene Interpreten, u. a. Bruno Mars, Britney Spears, Rhianna und Lady Gaga. Die Verwendung und das Sampeln fremder Musik- und Videotitel kann eine Urheberrechtsverletzung darstellen. Die Komponisten des Titels „Nur mir“ mit Sängerin Sabrina Setlur unterlagen in einem Rechtsstreit, der bis zum BGH führte. Sie haben im Zuge eines Tonträger-Samplings, so der BGH , in das Tonträgerherstellerrecht der Kläger (Musikgruppe Kraftwerk) eingegriffen, in dem sie im Wege des „Sampling“ zwei Takte einer Rhythmussequenz des Titels „Metall auf Metall“ entnommen und diese im eigenen Stück unterlegt haben. Der rasante technische Fortschritt macht es mittlerweile möglich, immer einfacher, schneller und besser Musik-, Film- und Bildaufnahmen zu bearbeiten und zu verändern. Computer mit Bearbeitungssoftware haben Keyboards, Synthesizer und analoge Mehrspurtechnik abgelöst. Die Methoden des Samplings unterscheiden sich von der klassischen Raubkopie dahingehend, dass mit der Sampleübernahme eine weitreichende Umgestaltung und Bearbeitung erfolgt. Die Raubkopie zeichnet sich durch eine unveränderte Übernahme des Originals aus. Betroffen von den Auswirkungen eines nicht rechtmäßig durchgeführten Sampling sind Urheber- und Leistungsschutzrechte ausübender Künstler sowie Leistungsschutzrechte von Tonträgerherstellern. U. U. sind auch Verstöße gegen das allgemeine Persönlichkeits- und Wettbewerbsrecht Gegenstand von streitigen Auseinandersetzungen.
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Book chapters on the topic "Single phase sampling"

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Neves, Claudia Mara Sperandio, João Felipe Coimbra Leite Costa, Leonardo Souza, Fernando Guimaraes, and Geraldo Dias. "Methodology for Defining the Optimal Drilling Grid in a Laterite Nickel Deposit Based on a Conditional Simulation." In Springer Proceedings in Earth and Environmental Sciences, 151–62. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-19845-8_13.

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AbstractIn mining projects, the confidence in an estimate is associated with the quantity and quality of the available information. Thus, the closer the data to the targeted location, the smaller the error associated with the estimated value. In the advanced stages of a project (i.e. the pre-feasibility and feasibility phases), it is usual to take samples derived from drillings. Since sampling and chemical analysis involve high costs, it is essential that these costs contribute to a reduction in the uncertainty of estimation. This paper presents a workflow for a case study of a lateritic nickel deposit and proposes a methodology to address the issue of optimising the drilling grid based on uncertainty derived from Gaussian conditional geostatistical simulations. The usefulness of the proposed workflow is demonstrated in terms of saving time and money when selecting a drill hole grid.
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Dawar, Kshitij, Sanjay Srinivasan, and Mort D. Webster. "Application of Reinforcement Learning for Well Location Optimization." In Springer Proceedings in Earth and Environmental Sciences, 81–110. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-19845-8_7.

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AbstractThe extensive deployment of sensors in oilfield operation and management has led to the collection of vast amounts of data, which in turn has enabled the use of machine learning models to improve decision-making. One of the prime applications of data-based decision-making is the identification of optimum well locations for hydrocarbon recovery. This task is made difficult by the relative lack of high-fidelity data regarding the subsurface to develop precise models in support of decision-making. Each well placement decision not only affects eventual recovery but also the decisions affecting future wells. Hence, there exists a tradeoff between recovery maximization and information gain. Existing methodologies for placement of wells during the early phases of reservoir development fail to take an abiding view of maximizing reservoir profitability, instead focusing on short-term gains. While improvements in drilling technologies have dramatically lowered the costs of producing hydrocarbon from prospects and resulted in very efficient drilling operations, these advancements have led to sub-optimal and haphazard placement of wells. This can lead to considerable number of unprofitable wells being drilled which, during periods of low oil and gas prices, can be detrimental for a company’s solvency. The goal of the research is to present a methodology that builds machine learning models, integrating geostatistics and reservoir flow dynamics, to determine optimum future well locations for maximizing reservoir recovery. A deep reinforcement learning (DRL) framework has been proposed to address the issue of long-horizon decision-making. The DRL reservoir agent employs intelligent sampling and utilizes a reward framework that is based on geostatistical and flow simulations. The implemented approach provides opportunities to insert expert information while basing well placement decisions on data collected from seismic data and prior well tests. Effects of prior information on the well placement decisions are explored and the developed DRL derived policies are compared to single-stage optimization methods for reservoir development. Under similar reward framework, sequential well placement strategies developed using DRL have been shown to perform better than simultaneous drilling of several wells.
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"Single-Phase Fluid Flow Through Porous Media." In Wireline Formation Testing: Hardware, Pressure Transient Testing, Interpretation and Sampling, 59–78. Society of Petroleum EngineersRichardson, Texas, USA, 2021. http://dx.doi.org/10.2118/9781613998434-04.

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Roszkowska, A., K. Łuczykowski, N. Warmuzińska, and B. Bojko. "SPME and Related Techniques in Biomedical Research." In Evolution of Solid Phase Microextraction Technology, 357–418. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839167300-00357.

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This chapter describes a wide range of applications of the SPME technique in biomedical research, beginning from investigations focused on the monitoring of the level of drugs used in the treatment of different diseases, through targeted analysis of endogenous compounds (metabolites) to untargeted metabolomics studies. The reader will find information about diverse SPME sampling strategies adopted to address demanding tasks, e.g., single cell analysis or on site sampling at the surgery room, discussion of unique features of SPME, and the areas of science, where the technology can be successfully deployed. In the first part of this chapter, various SPME protocols in the analysis of drugs used in cardiovascular and central nervous system diseases, immunosuppressants, anticancer drugs, and medications used in pain therapy are summarized. In addition, the aspects related to the application of SPME sampling in drug binding studies are described. In the second part of this chapter, the overview of the SPME technique in the determination of non-volatile and volatile compounds within targeted and untargeted metabolomic approaches along with their applications in the microbial, cellular, tissue, and biofluid analysis within different areas of medical science is presented. Finally, the authors discuss the issues related to the stability of target compounds based on several investigations utilizing SPME technology in comparison to traditional techniques described in the literature. Finally, present and future perspectives about the SPME technology in the area of bioanalysis and medical diagnostics are provided.
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Breva, Yannick, Johannes Kröger, Tobias Kersten, and Steffen Schön. "Estimation and Validation of Codephase Center Correction Using the Empirical Mode Decomposition." In International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/1345_2022_159.

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AbstractIn high precision Global Navigation Satellite Systems (GNSS) applications, it is necessary to take phase center corrections (PCC) into account. Beside these corrections for carrier phase measurements, also corrections for the codephase are necessary, so called codephase center corrections (CPC). The CPC, also known as group delay variations, are antenna dependent delays of the received codephase, which are varying with azimuth and elevation of the incoming GNSS signal. A concept for estimating absolute CPC and PCC for multi GNSS signals has been established by the Institut für Erdmessung.In this paper, the standard calibration approach with a sampling rate of 1 Hz is briefly described, which works well for PCC estimation. The main challenge of this approach for estimating repeatable CPC patterns is the significantly higher noise to pattern ratio in the observations compared to PCC determination. Therefore, an alternative processing strategy is presented in this contribution. By increasing the sampling rate to 10 Hz, the empirical mode decomposition can be used to reduce the noise of the input observations by maintaining all pattern information. With this method, the calibration repeatability is improved by 46% to 60% for GPS and Galileo C1C signals for a geodetic antenna. Moreover, the estimated pattern is validated in the positioning domain with a single point positioning approach. By considering the estimated CPC the accuracy of the height component can be improved.
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Milic, Ljiljana. "Lth-Band Digital Filters." In Multirate Filtering for Digital Signal Processing, 206–41. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-178-0.ch007.

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Digital Lth-band FIR and IIR filters are the special classes of digital filters, which are of particular interest both in single-rate and multirate signal processing. The common characteristic of Lth-band lowpass filters is that the 6 dB (or 3 dB) cutoff angular frequency is located at p/L, and the transition band is approximately symmetric around this frequency. In time domain, the impulse response of an Lth-band digital filter has zero valued samples at the multiples of L samples counted away from the central sample to the right and left directions. Actually, an Lth-band filter has the zero crossings at the regular distance of L samples thus satisfying the so-called zero intersymbol interference property. Sometimes the Lthband filters are called the Nyquist filters. The important benefit in applying Lth band FIR and IIR filters is the efficient implementation, particularly in the case L = 2 when every second coefficient in the transfer function is zero valued. Due to the zero intersymbol interference property, the Lth-band filters are very important for digital communication transmission systems. Another application is the construction of Hilbert transformers, which are used to generate the analytical signals. The Lth-band filters are also used as prototypes in constructing critically sampled multichannel filter banks. They are very popular in the sampling rate alteration systems as well, where they are used as decimation and interpolation filters in single-stage and multistage systems. This chapter starts with the linear-phase Lth-band FIR filters. We introduce the main definitions and present by means of examples the efficient polyphase implementation of the Lth-band FIR filters. We discuss the properties of the separable (factorizable) linear-phase FIR filter transfer function, and construct the minimum-phase and the maximum-phase FIR transfer functions. In sequel, we present the design and efficient implementation of the halfband FIR filters (L = 2). The class of IIR Lth-band and halfband filters is presented next. Particular attention is addressed to the design and implementation of IIR halfband filters. Chapter concludes with several MATLAB exercises for self study.
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Marks II, Robert J. "Multidimensional Signal Analysis." In Handbook of Fourier Analysis & Its Applications. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780195335927.003.0013.

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N dimensional signals are characterized as values in an N dimensional space. Each point in the space is assigned a value, possibly complex. Each dimension in the space can be discrete, continuous, or on a time scale. A black and white movie can be modelled as a three dimensional signal.Acolor picture can be modelled as three signals in two dimensions, one each, for example, for red, green and blue. This chapter explores Fourier characterization of different types of multidimensional signals and corresponding applications. Some signal characterizations are straightforward extensions of their one dimensional counterparts. Others, even in two dimensions, have properties not found in one dimensional signals. We are fortunate to be able to visualize structures in two, three, and sometimes four dimensions. It assists in the intuitive generalization of properties to higher dimensions. Fourier characterization of multidimensional signals allows straightforward modelling of reconstruction of images from their tomographic projections. Doing so is the foundation of certain medical and industrial imaging, including CAT (for computed axial tomography) scans. Multidimensional Fourier series are based on models found in nature in periodically replicated crystal Bravais lattices [987, 1188]. As is one dimension, the Fourier series components can be found from sampling the Fourier transform of a single period of the periodic signal. The multidimensional cosine transform, a relative of the Fourier transform, is used in image compression such as JPG images. Multidimensional signals can be filtered. The McClellan transform is a powerful method for the design of multidimensional filters, including generalization of the large catalog of zero phase one dimensional FIR filters into higher dimensions. As in one dimension, the multidimensional sampling theorem is the Fourier dual of the Fourier series. Unlike one dimension, sampling can be performed at the Nyquist density with a resulting dependency among sample values. This property can be used to reduce the sampling density of certain images below that of Nyquist, or to restore lost samples from those remaining. Multidimensional signal and image analysis is also the topic of Chapter 9 on time frequency representations, and Chapter 11 where POCS is applied signals in higher dimensions.
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Hiza, M., J. Nighswander, and A. Kurkjian. "Mixture Preparation and Sampling Hydrocarbon Reservoir Fluids." In Measurement of the Thermodynamic Properties of Single Phases, 97–123. Elsevier, 2003. http://dx.doi.org/10.1016/s1874-5644(03)80007-3.

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Dunn, Graham. "Statistics and the design of experiments and surveys." In New Oxford Textbook of Psychiatry, 137–43. Oxford University Press, 2012. http://dx.doi.org/10.1093/med/9780199696758.003.0017.

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Research into mental illness uses a much wider variety of statistical methods than those familiar to a typical medical statistician. In many ways there is more similarity to the statistical toolbox of the sociologist or educationalist. It would be a pointless exercise to try to describe this variety here but, instead, we shall cover a few areas that are especially characteristic of psychiatry. The first and perhaps the most obvious is the problem of measurement. Measurement reliability and its estimation are discussed in the next section. Misclassification errors are a concern of the third section, a major part of which is concerned with the estimation of prevalence through the use of fallible screening questionnaires. This is followed by a discussion of both measurement error and misclassification error in the context of modelling patterns of risk. Another major concern is the presence of missing data. Although this is common to all areas of medical research, it is of particular interest to the psychiatric epidemiologist because there is a long tradition (since the early 1970s) of introducing missing data by design. Here we are thinking of two-phase or double sampling (often confusingly called two-stage sampling by psychiatrists and other clinical research workers). In this design a first-phase sample are all given a screen questionnaire. They are then stratified on the basis of the results of the screen (usually, but not necessarily, using two strata—likely cases and likely non-cases) and subsampled for a second-phase diagnostic interview. This is the major topic of the third section. If we are interested in modelling patterns of risk, however, we are not usually merely interested in describing patterns of association. Typically we want to know if genetic or environmental exposures have a causal effect on the development of illness. Similarly, a clinician is concerned with answers to the question ‘What is the causal effect of treatment on outcome?’ How do we define a causal effect? How do we measure or estimate it? How do we design studies in order that we can get a valid estimate of a causal effect of treatment? Here we are concerned with the design and analysis of randomized controlled trials (RCTs). This is the focus of the fourth section of the present chapter. Finally, at the end of this chapter pointers are given to where the interested reader might find other relevant and useful material on psychiatric statistics.
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Lesot, Philippe, and Olivier Lafon. "Combining Fast 2D NMR Methods and Oriented Media." In Fast 2D Solution-state NMR, 441–75. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839168062-00441.

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NMR in oriented samples (anisotropic solvents) offers access to informative residual order-dependent NMR interactions, including chemical shift anisotropies (RCSAs), dipolar couplings (RDCs), and quadrupolar couplings (RQCs), while preserving high spectral resolution. The analysis of these spectra often requires two-dimensional (2D) NMR experiments due to these additional anisotropic interactions. In addition, accelerated 2D NMR experiments can be essential for particular investigations, including in situ monitoring of chemical reactions or the observation of dilute isotopes, e.g. 2H and 13C, since the stability of oriented phases is limited in time and the magnetic field, B0, can drift in the absence of 2H lock. We provide here an overview of these fast 2D NMR experiments in anisotropic media. These developments have benefited from those for isotropic solutions, such as fast pulsing techniques enhancing the polarization, sparse sampling, Hadamard spectroscopy or spatial encoding. Nevertheless, fast 2D NMR in mesophases and solids present particular challenges, since these 2D spectra usually display lower signal-to-noise ratios, non-Lorentzian lineshapes, lower spectral resolution and wider spectral widths than their counterparts for isotropic solutions. We discuss here the advantages and limitations of various approaches, which have been applied for the fast 2D NMR spectra of mesophases and solids.
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Conference papers on the topic "Single phase sampling"

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Vajpayee, Vineet, and P. Sumathi. "Adaptive sampling frequency based phase locking scheme for single-phase grid converters." In 2013 International Conference on Communications and Signal Processing (ICCSP). IEEE, 2013. http://dx.doi.org/10.1109/iccsp.2013.6577062.

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Barolak, Jonathan, David Goldberger, Claudia Schrama, Charles Durfee, and Daniel Adams. "High frame rate, phase and amplitude resolved imaging of single events using beam-sampling single-shot ptychography." In Real-time Measurements, Rogue Phenomena, and Single-Shot Applications VIII, edited by Georg Herink, Daniel R. Solli, and Serge Bielawski. SPIE, 2023. http://dx.doi.org/10.1117/12.2650367.

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Katayama, Ikufumi, and Ryo Tamaki. "Singleshot and high-sensitivity detection of terahertz waveforms using phase-offset electro-optic sampling and an echelon mirror." In Real-time Measurements, Rogue Phenomena, and Single-Shot Applications VIII, edited by Georg Herink, Daniel R. Solli, and Serge Bielawski. SPIE, 2023. http://dx.doi.org/10.1117/12.2652127.

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Suzuki, Kensuke, and Keiji Wada. "Current Control using Pulsed Current Sampling Considering Sampling Points and Sensor Positions for Single-Phase Inverter." In 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2019. http://dx.doi.org/10.1109/apec.2019.8721791.

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Yu, Yi, and Changyuan Yu. "OSNR Monitoring by Using Single Sampling Channel Generated 2-D Phase Portrait." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/ofc.2014.th2a.49.

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Yoshida, Morito, Yuichi Hanashima, and Tomoki Yokoyama. "1MHz sampling high-speed single-phase PLL control using FPGA based hardware controller." In 2012 7th International Power Electronics and Motion Control Conference (IPEMC 2012). IEEE, 2012. http://dx.doi.org/10.1109/ipemc.2012.6258817.

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Abe, Hironori, and Hiroshi Fujimoto. "Multirate Perfect Tracking Control of Single-phase Inverter with Inter Sampling for Arbitrary Waveform." In 2007 Power Conversion Conference - Nagoya. IEEE, 2007. http://dx.doi.org/10.1109/pccon.2007.373060.

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Galvan Sanchez, Francisco. "Innovative Single-Phase Tank Technology for In-Situ Sample Validation Enhances Fluid Sampling Integrity." In International Petroleum Technology Conference. International Petroleum Technology Conference, 2013. http://dx.doi.org/10.2523/16564-abstract.

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Galvan Sanchez, Francisco. "Innovative Single-Phase Tank Technology for In-Situ Sample Validation Enhances Fluid Sampling Integrity." In International Petroleum Technology Conference. International Petroleum Technology Conference, 2013. http://dx.doi.org/10.2523/iptc-16564-abstract.

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Kuo, Chin-Chang, and Ying-Yu Tzou. "FPGA predictive control for single-phase active NPC grid inverters with multi-sampling technique." In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7793060.

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Reports on the topic "Single phase sampling"

1

George, Grant, and Hawley. PR-015-13611-R01 Evaluation of Selected Sampling Techniques on Hydrocarbon-Wet Gas Streams. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2014. http://dx.doi.org/10.55274/r0010403.

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This project evaluated selected single-phase gas sampling methods as candidates for use in sampling hydrocarbon-wet gas streams and obtaining representative samples of only the gas phase, rather than samples of both the gas and liquid. Two spot sampling methods, the helium �pop� method and the floating piston cylinder method, were chosen for evaluation. To capture samples of only the gas phase required one or more arrangements for separating liquids from the sample stream. To this end, a coalescing filter and a vortex separator were chosen for testing with the two sampling methods. The various sampling approaches were tested using the Sampling Method Performance Verification Procedure of API MPMS Chapter 14.1, Appendix F, adapted as appropriate for use in hydrocarbon-wet gas streams. Preliminary tests at SwRI�s Metering Research Facility (MRF) were used to identify possible problems with the equipment and sampling procedures, so that the equipment and procedures could be corrected before the formal tests were conducted. The formal tests were performed at a field site carrying a hydrocarbon-wet gas stream from a shale formation. Results of the formal tests produced recommendations to improve the general ability of the chosen wet-gas sampling method to capture accurate samples of the gas phase, as well as recommended changes to the API Sampling Verification Procedure for testing wet-gas sampling methods.
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George and Grant. PR-015-14609-R01 Study of Sample Probe Minimum Insertion Depth Requirements. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2015. http://dx.doi.org/10.55274/r0010844.

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Probes for natural gas sample collection and analysis must extend far enough into the pipeline to avoid contaminants at the pipe wall, but must not be so long that there is a risk of flow-induced resonant vibration and failure. PRCI has sponsored a project to determine the minimum probe depth for obtaining a representative single-phase gas sample in flows with small amounts of contaminants. To this end, Phase 1 of the project involved a review of existing literature and industry standards to identify key probe design parameters. Several current standards for sampling clean, dry natural gas were reviewed, and their requirements for sample probe dimensions and mounting arrangements were compared. Some of these standard requirements suggested probe designs and sampling approaches that could be used to collect gas-only samples from two-phase flows. A literature review identified many useful studies of two-phase flows and phase behavior. While few of these studies evaluated probe designs, the majority examined the behavior of gas and liquid in two-phase flows, methods of predicting flow regimes, and methods of predicting flow conditions that define the minimum probe depth for gas-only samples in gas-liquid flows. Useful recommendations were provided for selecting general probe features where liquids must be rejected from the gas sample. A basic design procedure was also provided to select the minimum sample probe insertion length and optimum installation position for known flow conditions. Plans to test the recommendations and the design procedure in Phase 2 of the project were also discussed. This report has a related webinar.
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Mikula, R. J., I. S. Parsons, V. A. Munoz, W. W. Lam, C. Payette, and K. C. McAuley. High-temperature settling of bitumen from Aostra's underground test facility. Natural Resources Canada/CMSS/Information Management, 1990. http://dx.doi.org/10.4095/331489.

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Several bitumen samples from AOSTRA's Underground Test Facility were obtained (heat exchanger outlet) in order to characterize the emulsion droplet size distribution and to ultimately establish whether or not high temperature settling could successfully be used to separate the bitumen and water phases. Characterization of the dispersed phase was not straightforward since the samples varied. The samples would sometimes be separated into a large bitumen mass and significant free water and sometimes be quite fluid with dispersed bitumen. It was our opinion that sampling contamination, perhaps with residual soaps, lead to some samples remaining as a bitumen in water emulsion without separating. Normally, one would expect that the bitumen would separate from the free water. Preliminary characterization of the solids in the feed was also done since it is known that mineral/solids composition can influence emulsion formation and the stability of rag layers in bitumen/water separation schemes. High temperature settling evaluations proved the feasibility of this type of settling as a method of bitumen separation producing a product of less than 5% water. Good results were achieved with temperatures from 190 to 220 °C and 250 to 1000 ppm demulsifier. Separation without demulsifiers vas not successful. Product samples were examined microscopically to determine the dispersed water size distributions.
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