Relevant bibliographies by topics / Contribution averaging

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

Academic literature on the topic 'Contribution averaging'

Author: Grafiati
Published: 7 June 2025
Last updated: 2 August 2025

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Journal articles on the topic "Contribution averaging"

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Marteau, Pierre-François. "Estimating Road Segments Using Kernelized Averaging of GPS Trajectories." Applied Sciences 9, no. 13 (2019): 2736. http://dx.doi.org/10.3390/app9132736.

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A method called iTEKA, which stands for iterative time elastic kernel averaging, was successfully used for averaging time series. In this paper, we adapt it to GPS trajectories. The key contribution is a denoising procedure that includes an over-sampling scheme, the detection and removal of outlier trajectories, a kernelized time elastic averaging method, and a down-sampling as post-processing. The experiment carried out on benchmark datasets showed that the proposed procedure is effective and outperforms straightforward methods based on medoid or Euclidean averaging approaches.
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Schanbacher, Peter. "Averaging Across Asset Allocation Models." Jahrbücher für Nationalökonomie und Statistik 235, no. 1 (2015): 61–81. http://dx.doi.org/10.1515/jbnst-2015-0106.

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Summary Combination of asset allocation models is rewarding if (i) the applied risk function is concave and (ii) there is no dominating model. We show that most common risk functions are either concave or at least concave in common applications. In a comprehensive empirical study using standard asset allocation models we find that there is no constantly dominating model. The ranking of the models depends on the data set, the risk function and even changes over time. We find that a simple average of all asset allocation models can outperform each individual model. Our contribution is twofold. W
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Chandra Sen. "Comments on Modeling of Gauss Elimination Technique and AHA Simplex Algorithm for Multi-objective Linear Programming Problems by Sanjay Jain and Adarsh Mangal." International Journal for Modern Trends in Science and Technology 06, no. 09 (2020): 94–96. http://dx.doi.org/10.46501/ijmtst060915.

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An excellent research contribution was made by Sanjay and Adarsh in using Gauss Elimination Technique and AHA simplex method for solving multi-objective optimization (MOO) problems. The method was applied for solving MOO problems using Chandra Sen's technique and several other averaging techniques. The formulation of multi-objective function in the averaging techniques was not perfect. The example was also not appropriate.
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Barman, S. A., J. L. Ardell, J. C. Parker, M. L. Perry, and A. E. Taylor. "Pulmonary and systemic blood flow contributions to upper airways in canine lung." American Journal of Physiology-Heart and Circulatory Physiology 255, no. 5 (1988): H1130—H1135. http://dx.doi.org/10.1152/ajpheart.1988.255.5.h1130.

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The blood flow contributions and drainage patterns of the pulmonary and systemic circulations in the upper airways (trachea and main bronchi) were assessed in anesthetized dogs by injecting 15-micron radiolabeled microspheres into the right and left heart, respectively. After the animals were killed, the tracheal cartilage, tracheal muscle-mucosa, and main bronchi were excised. The tracheal cartilage and tracheal muscle-mucosa were divided into lower, middle, and upper segments for blood flow determinations. The pulmonary contribution to tracheal blood flow was very small, averaging only 0.6 +
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Donovan, John J., and Nicholas E. Pingitore. "Compositional Averaging of Continuum Intensities in Multielement Compounds." Microscopy and Microanalysis 8, no. 5 (2002): 429–36. http://dx.doi.org/10.1017/s1431927602020160.

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We find no physical basis for traditional mass-fraction weighted averaging of X-ray continuum measured in pure elements to estimate continuum production from compounds. Measurements of continuum from pairs of stable isotopes demonstrate that mass alone (the presence of more or fewer neutrons) has no effect on continuum production in electron probe microanalysis. Electron-fraction weighted averaging, which is based on the relative contribution of each constituent element to the electron (or proton) composition of a compound, proved superior to mass-fraction weighted averaging, in predicting the
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Tozer, K. N., G. B. Douglas, R. A. Moss, et al. "Early performance of oversown pasture mixtures on non-cultivable hill country at four geo-climatically different sites." Proceedings of the New Zealand Grassland Association 76 (January 1, 2014): 155–62. http://dx.doi.org/10.33584/jnzg.2014.76.2944.

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Abstract A trial was conducted on non-cultivable hill country (>20o slope) at four sites to determine the effect of seed mixture (grass+legume+herb vs legume) and sowing time (spring vs autumn) on plant establishment. Sites were in Canterbury (1 site), Hawke's Bay (2) and Waikato (1) on north and south aspects and differed predominantly in climate. In the first spring after sowing (12 months after spring sowing; 6 months after autumn sowing), sown legume and total sown species contributions (% of total dry matter (DM)) were: greater in the grass+legume+herb than legume mixtures; greater whe
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Ding, Xue Wen, Berthold Mahundi, Fei Yang, and Guang Quan Xu. "Image Fusion Using Wavelet Transform and Fuzzy Reasoning." Applied Mechanics and Materials 239-240 (December 2012): 1336–39. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1336.

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The image fusion algorithm discussed in this paper which utilizes wavelet decomposition and fuzzy reasoning combines images from diverse imaging sensors into a single composite image. It first decomposed source images through wavelet transform, computed the extent of each source image’s contribution through fuzzy reasoning using the area feature of source images, and then fused the coefficients through weighted averaging with the extents of each source images’ contributions as the weight coefficients. Experimental results indicate the final composite image may have more complete information co
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Altrio, Raynaldo Free, and Bani Saad. "ANALISIS LAJU PERTUMBUHAN KONTRIBUSI PKB, PBBKB DAN BBNKB TERHADAP PENDAPATAN ASLI DAERAH (STUDI KASUS TERHADAP PADA JAWA BARAT DAN DKI JAKARTA Periode Tahun 2015-2019)." Journal of Accounting, Management and Islamic Economics 1, no. 2 (2023): 469–78. http://dx.doi.org/10.35384/jamie.v1i2.464.

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The purpose of this study is to find out the growth rate and tax contribution generated by Motor Vehicle Tax (PKB), Motor Vehicle Fuel Tax (UNKB) and Motor Vehicle Name Duty (BBNKB) in West Java province and DKI Jakarta with research range 2015-2019. This type of research is quantitative descriptive with the type of data used, namely primary and secondary data. The analysis used is the analysis of growth rates and contributions. The results of the study showed that the growth rate of PKB, UNKB and BBNKB in West Java and DKI Jakarta annually experienced ups and downs, with the highest growth ra
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Forte, Esther, Andrew J. Haslam, George Jackson, and Erich A. Müller. "Effective coarse-grained solid–fluid potentials and their application to model adsorption of fluids on heterogeneous surfaces." Phys. Chem. Chem. Phys. 16, no. 36 (2014): 19165–80. http://dx.doi.org/10.1039/c4cp00670d.

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In the present contribution we emphasise the necessity of using an adequate averaging procedure to obtain effective fluid–surface potentials. A procedure to develop free-energy-averaged fluid–surface potentials retaining the important temperature dependence of the coarse-grained particle-surface interaction is described.
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Liljebäck, Pål, Kristin Y. Pettersen, Øyvind Stavdahl, and Jan Tommy Gravdahl. "Lateral undulation of snake robots: a simplified model and fundamental properties." Robotica 31, no. 7 (2013): 1005–36. http://dx.doi.org/10.1017/s0263574713000295.

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SUMMARYThis paper considers the lateral undulation motion of snake robots. The first contribution of the paper is a model of lateral undulation dynamics developed for control design and stability analysis purposes. The second contribution is an analysis of the simplified model that shows that any asymptotically stabilizing control law for the snake robot to an equilibrium point must be time varying. Furthermore, the analysis shows that a snake robot (with four links) is strongly accessible from almost any equilibrium point, except for certain singular configurations, and that the robot does no
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Dissertations / Theses on the topic "Contribution averaging"

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Cintra, Daniel. "Contribution à l'étude du phénomène d'oscillation argumentaire." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1220/document.

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Contribution à l’étude du phénomène d’oscillation argumentaire. L’oscillateur argumentaire a un mouvement stable périodique, à une fréquence proche de sa fréquence fondamentale, lorsqu’il est soumis à une excitation provenant d’une source de type harmonique, à une fréquence qui est un multiple de ladite fréquence fondamentale, et agissant de manière telle que son interaction avec le système dépende des coordonnées d’espace du système. La présente thèse étudie quelques systèmes argumentaires et essaie de mettre en évidence des relations symboliques entre les paramètres de ces systèmes et leur c
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Books on the topic "Contribution averaging"

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Chance, Kelly, and Randall V. Martin. Data Fitting. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199662104.003.0011.

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This chapter explores several of the most common and useful approaches to atmospheric data fitting as well as the process of using air mass factors to produce vertical atmospheric column abundances from line-of-sight slant columns determined by data fitting. An atmospheric spectrum or other type of atmospheric sounding is usually fitted to a parameterized physical model by minimizing a cost function, usually chi-squared. Linear fitting, when the model of the measurements is linear in the model parameters is described, followed by the more common nonlinear fitting case. For nonlinear fitting, t
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Zeitlin, Vladimir. Rotating Shallow-Water Models with Full Coriolis Force. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198804338.003.0016.

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The derivation of the rotating shallow-water model by vertical averaging is carried on in the tangent plane approximation without neglecting the vertical component of the Coriolis force, and contributions of the vertical component of velocity in its horizontal component (‘non-traditional’ terms), leading to one- and two-layer ‘non-traditional’ rotating shallow-water models. A similar approach on the whole sphere encounters difficulties with conservation of angular momentum. Consistent ‘non-traditional’ rotating shallow-water equations in this case are obtained from the variational principle, w
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Book chapters on the topic "Contribution averaging"

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Malisch, Rainer, Alexander Schächtele, Ralf Lippold, et al. "Overall Conclusions and Key Messages of the WHO/UNEP-Coordinated Human Milk Studies on Persistent Organic Pollutants." In Persistent Organic Pollutants in Human Milk. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34087-1_16.

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AbstractBuilding on the two rounds of exposure studies with human milk coordinated by the World Health Organization (WHO) in the mid-1980s and 1990s on polychlorinated biphenyls (PCB), polychlorinated dibenzo-p-dioxins (PCDD), and polychlorinated dibenzofurans (PCDF), five expanded studies on persistent organic pollutants (POPs) were performed between 2000 and 2019. After the adoption of the Stockholm Convention on POPs (the Convention) in 2001, WHO and the United Nations Environment Programme (UNEP) collaborated in joint studies starting in 2004. The collaboration aimed at provision of POPs d
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Brockmann, Jan Martin, Moritz Borlinghaus, Christian Neyers, and Wolf-Dieter Schuh. "On the Coestimation of Long-Term Spatio-Temporal Signals to Reduce the Aliasing Effect in Parametric Geodetic Mean Dynamic Topography Estimation." In International Association of Geodesy Symposia. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/1345_2023_224.

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AbstractThe geodetic estimation of the mean dynamic ocean topography (MDT) as the difference between the mean of the sea surface and the geoid remains, despite the simple relation, still a difficult task. Mainly, the spectral inconsistency between the available altimetric sea surface height (SSH) observations and the geoid information causes problems in the separation process of the spatially and temporally averaged SSH into geoid and MDT. This is aggravated by the accuracy characteristics of the satellite derived geoid information, as it is only sufficiently accurate for a resolution of about
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Ali, Mohammed Yousef Salem, Mohamed Abdel-Nasser, Mohammed Jabreel, Aida Valls, and Marc Baget. "Segmenting the Optic Disc Using a Deep Learning Ensemble Model Based on OWA Operators." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2021. http://dx.doi.org/10.3233/faia210149.

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The optic disc (OD) is the point where the retinal vessels begin. OD carries essential information linked to Diabetic Retinopathy and glaucoma that may cause vision loss. Therefore, accurate segmentation of the optic disc from eye fundus images is essential to develop efficient automated DR and glaucoma detection systems. This paper presents a deep learning-based system for OD segmentation based on an ensemble of efficient semantic segmentation models for medical image segmentation. The aggregation of the different DL models was performed with the ordered weighted averaging (OWA) operators. We
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"A SOCIAL AVERAGING THEOREM FOR GROUP DECISION MAKING." In Contributions To Information Integration Theory. Psychology Press, 2014. http://dx.doi.org/10.4324/9781315807324-6.

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"TWO PROBLEMS IN COGNITIVE ALGEBRA: IMPUTATIONS AND AVERAGING VERSUS MULTIPLYING." In Contributions To Information Integration Theory. Psychology Press, 2014. http://dx.doi.org/10.4324/9781315807324-9.

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López de Aberasturi Gómez, Alejandra, Jordi Sabater-Mir, and Carles Sierra. "Learning Brain-Storming with Multiagent Multi-Armed Bandits." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2024. http://dx.doi.org/10.3233/faia240419.

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We formalise human teamwork in tasks involving judgment as a public goods game. Our focus is on tasks where members’ contributions are combined through weighted averaging, such as brain-storming. Using a multiagent system, we examine the alignment between learned agent strategies and Nash Equilibria. Overall, our results demonstrate that our multiagent system effectively approximates the Nash Equilibria of the game.
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Kaimal, J. C., and J. J. Finnigan. "Acquisition and Processing of Atmospheric Boundary Layer Data." In Atmospheric Boundary Layer Flows. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195062397.003.0010.

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Much of what we know about the structure of the boundary layer is empirical, the result of painstaking analysis of observational data. As our understanding of the boundary layer evolved, so did our ability to define more clearly the requirements for sensing atmospheric variables and for processing that information. Decisions regarding choice of sampling rates, averaging time, detrending, ways to minimize aliasing, and so on, became easier to make. We find we can even standardize most procedures for real-time processing. The smaller, faster computers, now within the reach of most boundary layer
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Rathor, Girraj Prasad, and Sanjeev Kumar Gupta. "Improving Multimodality Image Fusion through Integrate AFL and Wavelet Transform." In Biometrics. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0983-7.ch073.

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Image fusion based on different wavelet transform is the most commonly used image fusion method, which fuses the source pictures data in wavelet space as per some fusion rules. But, because of the uncertainties of the source images contributions to the fused image, to design a good fusion rule to incorporate however much data as could reasonably be expected into the fused picture turns into the most vital issue. On the other hand, adaptive fuzzy logic is the ideal approach to determine uncertain issues, yet it has not been utilized as a part of the outline of fusion rule. A new fusion techniqu
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Rathor, Girraj Prasad, and Sanjeev Kumar Gupta. "Improving Multimodality Image Fusion through Integrate AFL and Wavelet Transform." In Pattern and Data Analysis in Healthcare Settings. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0536-5.ch008.

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Image fusion based on different wavelet transform is the most commonly used image fusion method, which fuses the source pictures data in wavelet space as per some fusion rules. But, because of the uncertainties of the source images contributions to the fused image, to design a good fusion rule to incorporate however much data as could reasonably be expected into the fused picture turns into the most vital issue. On the other hand, adaptive fuzzy logic is the ideal approach to determine uncertain issues, yet it has not been utilized as a part of the outline of fusion rule. A new fusion techniqu
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Ankuria, A., O. Biswas, B. Giri, and M. Mime. "ALTERNATIVE MARINE FUELS: A GREEN APPROACH TOWARDS ACHIEVING CARBON NEUTRALITY." In Futuristic Trends in Renewable & Sustainable Energy Volume 3 Book 2. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bars2p2ch7.

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The fisheries sector is experiencing rapid growth to meet the escalating global demand for seafood. One critical factor contributing to the environmental impact of this sector is fuel consumption, which varies significantly based on the fishing methods employed. This paper reviews the findings of numerous studies that have assessed the environmental implications of capture fisheries using the life cycle assessment (LCA) method. It is reported that the annual fuel consumption in the fisheries industry amounts to approximately 50 million cubic meters, equivalent to 1.2% of global oil consumption
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Conference papers on the topic "Contribution averaging"

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Kosel, T. H., and S. S. Aptekar. "Effect of Hard Second-Phase Particles on the Erosion Resistance of Model Alloys." In CORROSION 1986. NACE International, 1986. https://doi.org/10.5006/c1986-86113.

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Abstract The dependence of erosion rate on second-phase volume fraction (SPVF) has been studied for Cu/Al2O3 and Cu/WC(W2C) model alloys produced by pressing and sintering. The intention of the study was to investigate the reasons for the poor contribution to erosion resistance made by large hard second-phase particles (SPP) in other studies. The results show that for the Cu/Al2O3 alloys, the erosion rate generally increased with SPVF, demonstrating a negative contribution to erosion resistance. This occurred despite the fact that the measured erosion rate of monolithic Al2O3 was lower by one
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Tastan, Nurbek, Samar Fares, Toluwani Aremu, Samuel Horváth, and Karthik Nandakumar. "Redefining Contributions: Shapley-Driven Federated Learning." In Thirty-Third International Joint Conference on Artificial Intelligence {IJCAI-24}. International Joint Conferences on Artificial Intelligence Organization, 2024. http://dx.doi.org/10.24963/ijcai.2024/554.

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Federated learning (FL) has emerged as a pivotal approach in machine learning, enabling multiple participants to collaboratively train a global model without sharing raw data. While FL finds applications in various domains such as healthcare and finance, it is challenging to ensure global model convergence when participants do not contribute equally and/or honestly. To overcome this challenge, principled mechanisms are required to evaluate the contributions made by individual participants in the FL setting. Existing solutions for contribution assessment rely on general accuracy evaluation, oft
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Leggett, John, Edward Richardson, Stephan Priebe, Aamir Shabbir, Vittorio Michelassi, and Richard Sandberg. "Loss Analysis of Unsteady Turbomachinery Flows Based on the Mechanical Work Potential." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91253.

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Abstract Loss analysis is a valuable technique for improving the thermodynamic performance of turbomachines. Analysing loss in terms of the ‘mechanical work potential’ (Miller, R.J., ASME Turbo Expo 2013, GT2013-95488) provides an instantaneous and local account of the thermal and aerodynamic mechanisms contributing to the loss of thermodynamic performance. This study develops the practical application of mechanical work potential loss analysis, providing the mathematical formulations necessary to perform loss analysis using practical Reynolds-Averaged Navier-Stokes (RANS) or Large Eddy Simula
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Simon, J. F., and O. Le´onard. "On the Role of the Deterministic and Circumferential Stresses in Throughflow Calculations." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50119.

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This paper presents a throughflow analysis tool developed in the context of the average-passage flow model elaborated by Adamczyk. The Adamczyk’s flow model describes the 3-D time-averaged flow field within a blade row passage. The set of equations that governs this flow field is obtained by performing a Reynolds averaging, a time averaging and a passage-to-passage averaging on the Navier-Stokes equations. The throughflow level of approximation is obtained by performing an additional circumferential averaging on the 3-D average-passage flow. The resulting set of equations is similar to the 2-D
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Seiple, William, Irwin Siegel, and Ronald Carr. "Focal ERG Measures of Temporal Modulation Sensitivity." In Noninvasive Assessment of Visual Function. Optica Publishing Group, 1985. http://dx.doi.org/10.1364/navf.1985.tub3.

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In this study we applied the powerful stimulus control inherent in psychophysical methods to electroretinographic study of the modulation sensitivities (deLange curves) of the mid-and outer-retinal layers in the macular region. Focal ERG (FERG) thresholds were determined both by signal averaging and by using lock-in amplifier retrieval of responses in real-time. The aim of this study was to partition out the retinal contribution to the deLange curve (the FERG data) and compare the results with the similarly derived psychophysical results.
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Belyuchenko, K. V., M. V. Klimenko, K. G. Ratovsky, and V. V. Klimenko. "COMPARISON BETWEEN CONTRIBUTIONS OF DIFFERENT ALTITUDE INTERVALS TO THE RESPONSE OF REGIONAL ELECTRON CONTENT AT HIGH LATITUDE TO GEOMAGNETIC STORMS IN SPRING." In Baikal Young Scientists’ International School on Fundamental Physics. Institute of Solar-Terrestrial Physics SB RAS, 2024. http://dx.doi.org/10.62955/0135-3748-2024-102.

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Based on the Global Self-Consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP), the response of the regional electron content of the ionosphere (REC) at high latitudes was calculated for the storm of March 17, 2015 and for an isolated reference geomagnetic AE storm obtained by averaging the AE index variation using the superposition of epochs with key moments corresponding to the AE index maximum. In this paper, the contribution of three altitude intervals (80–300 km, 300–800 km and 800–20000 km) to the response of high-latitude REC to geomagnetic storms will be consider
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Desnoyers, Yvon. "The Relative Importance of Destructive Analyses for Radiological Characterization With Geostatistics." In ASME 2023 International Conference on Environmental Remediation and Radioactive Waste Management. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/icem2023-109666.

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Abstract Geostatistics provides innovative tools for the radiological characterization of nuclear facilities under decommissioning as well as contaminated sites for remediation. The relevance of this approach relies on the presence of a spatial continuity for radiological contamination. In this case, geostatistics provides reliable activity estimates, uncertainty quantification and risk analysis, which are essential decision-making tools for decommissioning and dismantling projects of nuclear installations. The experimental variogram γ(h) is calculated by averaging, within classes of distance
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Coscia, Kevin, Sudhakar Neti, Alparslan Oztekin, Spencer Nelle, Satish Mohapatra, and Tucker Elliott. "The Thermophysical Properties of the NaNO3-KNO3, LiNO3-NaNO3, and LiNO3-KNO3 Systems." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64465.

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The present work comprises of thermophysical properties of nitrate-based binary heat transfer fluids of various compositions. For various nitrate mixtures, specific heat, latent heat of fusion, and viscosity as a function of shear rate are reported at various temperatures. Phase diagrams have also been constructed for these binary mixtures using differential scanning calorimetry. It was found that the contribution of the lithium nitrate on the binary mixtures had the largest increase in specific heat. As with most fluids, viscosity significantly decreases with temperature. The latent heat of t
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Shan, Youngbin, Yaoguang Wu, Aiguo Hu, and Fanlei Li. "Interactive Analysis (IRA) Determining Focal Reservoir Parameters Dominating Estimated Ultimate Recovery (EUR)." In Gas & Oil Technology Showcase and Conference. SPE, 2023. http://dx.doi.org/10.2118/214115-ms.

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Abstract Interactive Analysis (IRA) is a new reservoir study method which applies to both condensate oil & gas reservoir and conventional oil & gas reservoir. IRA establishes the correspondence between stage EUR equivalents and reservoir parameters. Often, reservoir parameters include but not limited to porosity, permeability, burst pressure, Poisson rate, Oil saturation or Gas content, Free gas content and adsorption gas content, pay zone thickness, resistivity, mud content, etc. In a specific compartmentalization, it is important to decide which parameter is the focal parameter domin
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Hespeel, D., G. Giovannelli, and B. E. Forestier. "Wavenumber-Frequency Spectrum Measurement of Wall Shear Stress Fluctuations Beneath a Planar Turbulent Boundary Layer." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0500.

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Abstract The majority of past and recent works on the wall pressure spectrum of a turbulent boundary layer considers that the wall shear stress effects are negligible. To estimate the contribution of the shear stress dipoles to the wall pressure generation, instantaneous fluctuations of streamwise wall shear stress have been measured using hot-element probes in a planar turbulent boundary layer. Considering various factors such as heat loss to the probe substrate, frequency response of the probes, spanwise averaging and length to diameter ratio of the heated element, the wall shear stress freq
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