Relevant bibliographies by topics / Non-homogeneous

Academic literature on the topic 'Non-homogeneous'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 January 2023

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Journal articles on the topic "Non-homogeneous"

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Pashenkov, V. V. "Homogeneous and non-homogeneous duality." Russian Mathematical Surveys 42, no. 5 (October 31, 1987): 95–121. http://dx.doi.org/10.1070/rm1987v042n05abeh001486.

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Liu, Jun, Junping Kong, and Qinying Fan. "Performance Analysis of Non-Homogeneous Hybrid Production Lines." International Journal of Machine Learning and Computing 4, no. 5 (2014): 463–67. http://dx.doi.org/10.7763/ijmlc.2014.v4.455.

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Rahimov, Ibrahim. "Homogeneous Branching Processes with Non-Homogeneous Immigration." Stochastics and Quality Control 36, no. 2 (December 1, 2021): 165–83. http://dx.doi.org/10.1515/eqc-2021-0033.

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Abstract The stationary immigration has a limited effect over the asymptotic behavior of the underlying branching process. It affects mostly the limiting distribution and the life-period of the process. In contrast, if the immigration rate changes over time, then the asymptotic behavior of the process is significantly different and a variety of new phenomena are observed. In this review we discuss branching processes with time non-homogeneous immigration. Our goal is to help researchers interested in the topic to familiarize themselves with the current state of research.
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Zaballa, Ion, and Juan M. Gracia. "On difference linear periodic systems II. Non-homogeneous case." Applications of Mathematics 30, no. 6 (1985): 403–12. http://dx.doi.org/10.21136/am.1985.104170.

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Cattiaux, Patrick, and Laurent Mesnager. "Hypoelliptic non-homogeneous diffusions." Probability Theory and Related Fields 123, no. 4 (August 1, 2002): 453–83. http://dx.doi.org/10.1007/s004400100194.

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Capitelli, Nicolas Ariel, and Elias Gabriel Minian. "Non-homogeneous combinatorial manifolds." Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry 54, no. 1 (June 17, 2012): 419–39. http://dx.doi.org/10.1007/s13366-012-0114-6.

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Panario, Daniel, Murat Sahin, and Qiang Wang. "Non-homogeneous conditional recurrences." Linear and Multilinear Algebra 66, no. 10 (October 3, 2017): 2089–99. http://dx.doi.org/10.1080/03081087.2017.1384445.

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Amann, Manuel. "Non-formal homogeneous spaces." Mathematische Zeitschrift 274, no. 3-4 (December 6, 2012): 1299–325. http://dx.doi.org/10.1007/s00209-012-1117-6.

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Chattopadhyay, A., S. Gupta, Pato Kumari, and V. K. Sharma. "Torsional wave propagation in non-homogeneous layer between non-homogeneous half-spaces." International Journal for Numerical and Analytical Methods in Geomechanics 37, no. 10 (February 24, 2012): 1280–91. http://dx.doi.org/10.1002/nag.2083.

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Yeh, W. C., C. K. Hu, F. B. Liu, and C. F. Hu. "Efficiency Measurement for Non-homogeneous Units in a Fuzzy Environment." International Journal of Trade, Economics and Finance 11, no. 4 (August 2020): 65–70. http://dx.doi.org/10.18178/ijtef.2020.11.4.668.

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Dissertations / Theses on the topic "Non-homogeneous"

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Witt, James David Samuel. "Superconductivity and non-homogeneous magnetism." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610601.

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Ben, Mahjoub Otman. "Non-local dynamics and intermittency in non-homogeneous flows." Doctoral thesis, Universitat Politècnica de Catalunya, 2000. http://hdl.handle.net/10803/6572.

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La tesi analitza les dinàmiques no locals i la intermitència en fluids no homogenis i no isotròpics tant en experiments de laboratori com en dades geogràfiques. Després de l'estudi sobre els models que descriuen la intermitència en fluids homogenis i isotròpics, presentem un model per fluids no homogenis i no isotropics. El model es basa en l'anàlisi de la jerarquia de transmissió d'energia. S'utilitza la tècnica de la Extended Self Similarity amb l'objectiu d'estudiar l'escala de lleis de les funcions estructurals de velocitat. Els resultats experimentals de tres tipus de fluids que s'han comparat amb el model per fluids no homogenis i no isotròpics són els següents: turbulència generada per un cilindre en un canal de vent i turbulència generada per una reixa i per un jet en un canal d'aigua. S'analitza la turbulència geogràfica del Delta de l'Ebre i del Knebel Vig i els resultats són comparats amb els del model anteriorment esmentat. La contribució principal és el descobriment d'un paràmetre aparentment relacionat amb la jerarquia de transmissió d'energia en el rang inercial que juga un paper clau en la comprensió de les dinàmiques dels fluids no homogenis.
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The thesis analyze the non-local dynamics and intermittency in non-homogeneous and non-isotropic flows both in the laboratory experiments and geophysical data. After a review on models describing intermittency in homogeneous and isotropic flows, a different model for non-homogeneous and non-isotropic flows is introduced. A model is based on the analysis of the energy transfer hierarchy. The technique of Extended Self Similarity is used to study the scaling laws of the velocity structure functions. Experimental results of three type of flows cylinder wake turbulence in wind tunnel, grid and jet turbulence in water channel are presented and compared with the model. The geophysical turbulence in the Ebro Delta and Knebel Vig are analyzed and the results are compared with the model. The important contribution is the discovery of a new apparently parameter related to the energy transfer hierarchy in the inertial range which plays a key role in the understanding of the dynamics of the non-homogeneous flows.
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Alnuaimi, Nasser Abdullah. "Modeling ultrasonic transducer in homogeneous and non-homogeneous media using DPSM method." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280583.

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Modeling ultrasonic transducers is an important aspect of research in nondestructive evaluation and testing. In most nondestructive evaluation applications, the ultrasonic transducers are traditionally modeled as: (1) point sources generating spherical wave fronts (2) line sources generating cylindrical wave fronts, or (3) planar surfaces generating plane wave fronts. In reality, the transducer front face has finite dimensions; it is neither point source nor planar source because the ultrasound that emits from a piezoelectric transducer does not originate from a point or an infinite plane, but instead originates from the finite surface of the piezoelectric element with flat or curved front face. Analytically modeling the fields radiated by ultrasonic transducers is a very difficult task because of the large number of possible transducer types, sizes and configurations that are used in practice. In this study, a semi analytical technique the Distributed Point Source Method (DPSM) is adapted to model ultrasonic transducers. The DPSM discretizes the transducer surface into a finite number of elemental surfaces. As a result, the complexity associated with the discretization of the three-dimensional problem geometry as done in the finite element technique is reduced. In the DPSM technique, the fundamental governing equations for elastic wave propagation in a fluid and in a solid are solved. For this reason, the DPSM technique is called a semi-analytical technique. In this research, computer codes for computing the ultrasonic field in a three dimensional inhomogeneous medium in front of a transducer of finite dimension have been written in MatLab. Two different cases are considered in this study, nonhomogeneous fluid and fluid-solid interface. Both normal and inclined incidence cases are investigated. This investigation shows that DPSM is an efficient technique for modeling ultrasonic transducers in nonhomogeneous media.
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La, Vecchia Miriam. "Bacterial chemotaxis in non-homogeneous shear flow." Thesis, KTH, Mekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36075.

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Lee, Siew-Eang. "Transmission of sound through non-homogeneous walls." Thesis, Heriot-Watt University, 1985. http://hdl.handle.net/10399/1656.

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Tsamis, Alexandros 1976. "Digital graft : towards a non-homogeneous materiality." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28810.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2004.
Includes bibliographical references (leaves 104-110).
(cont.) and form development. Through this approach, space can be perceived not as distributed geometries, but rather as a composite graft responding locally to flows of programmatic and environmental parameters.
Digital methodologies have radically shifted our conception of the design process, as well as our understanding of geometry in terms of flexible relationships instead of finite positions in space. However, the material tectonic that digital means imply has not yet been explored on the basis of the new possibilities disclosed by these very same tools. Tectonic investigations have almost exclusively focused on construction techniques and primarily on the optimisation of methods that preceded the appearance of digital tools. I would argue, that computer generated architecture might imply a new understanding of matter and mass. So far, the materialization of formal expressions instigated by such processes are primarily based on techniques of assembly, which do not negotiate the advanced levels of material complexity that the tools put forward. This thesis lies on the premise of investigating modes to address an emergent rather than imposed materiality of distributions, instigated by computer-generated processes. Methodologically, this thesis has a twofold task. The former is to interrogate an alternate prism of construction history, which does not shed emphasis on geometry, but rather on mass and matter, paraphrasing Michel Serres. The atter task is to launch design experiments that respond to an alternate, emerging perception of material densities, constellations and coagulations. Through a series of digital case studies it becomes both a "theoretical" and "technical" probe of a materiality with local differences exploring non-homogeneous ways of distributing matter in space. Three material strategies--thread, component and substance--will be presented in an attempt to address modes of interrogating a reciprocal relationship between material
by Alexandros Tsamis.
S.M.
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Qiu, Hongtao. "Natural convection in a non-homogeneous enclosure." Ann Arbor, Mich. : ProQuest, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3303953.

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Thesis (Ph.D. in Mechanical Engineering)--S.M.U.
Title from PDF title page (viewed Mar. 16, 2009). Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1917. Adviser: Jose L. Lage. Includes bibliographical references.
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Redd, Preston T. "Market Dynamics with Non-Homogeneous Poisson Processes." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3630.

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The Bertrand Duopoly model for demand in economics is a well-used model. Although this model has important insights towards pricing strategy, it does not accurately depict true market behaviors. In this paper, we will examine the advantages and disadvantages of the current model and its assumptions.We then take a whole new approach towards modeling this phenomena, using Poisson processes to model the demand of goods. We will discuss why this is a better approach and explain how we can extend this to better understand pricing strategies and market dynamics. We then apply our findings to the newsvendor problem, a commonly used problem in inventory management. Using non-homogeneous Poisson processes we explain how to find an optimal pricing strategy and an optimal inventory level for the newsvendor problem.In this paper we explain how to extend the newsvendor problem to a newsvendor duopoly problem. Again we show how to find the optimal pricing strategies and inventory levels for multiple goods in a market. Having found the optimal pricing strategy and inventory level, we then examine the market dynamics in more details. We explore monopolistic and duopolistic markets where the goods range from complements to substitutes and homogeneous to differentiated goods. We discuss how to model the progression of the inventory probabilities and then explain how to price inventory options.
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Legg, Matthew W. "Non-Gaussian and non-homogeneous Poisson models of snapping shrimp noise." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/839.

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The problem of sonar detection and underwater communication in the presence of impulsive snapping shrimp noise is considered. Non-Gaussian amplitude and nonhomogeneous Poisson temporal statistical models of shrimp noise are investigated from the perspective of a single hydrophone immersed in shallow waters. New statistical models of the noise are devised and used to both challenge the superiority of existing models, and to provide alternative insights into the underlying physical processes.A heuristic amplitude statistical model of snapping shrimp noise is derived from first principles and compared with the Symmetric-α-stable model. The models are shown to have similar variability through the body of the amplitude probability density functions of real shrimp noise, however the new model is shown to have a superior fit to the extreme tails. Narrow-band detection using locally optimum detectors derived from these models show that the Symmetric-α-stable detector retains it's superiority, despite providing a poorer overall fit to the amplitude probability density functions. The results also confirm the superiority of the Symmetric-α-stable detector for detection of narrowband signals in shrimp noise from Australian waters.The temporal nature of snapping from a field of shrimp is investigated by considering the snapping as a point process in time. Point process analysis techniques are drawn from the fields of optics, neuro-physics, molecular biology, finance and computer science, and applied to the problem of snapping shrimp noise. It is concluded that the snapping is not consistent with a homogeneous Poisson process and that correlations exist in the point process on three different time scales. The cause of short time correlations is identified as surface reflected replicas, and models of medium time correlations are investigated. It is shown that a Cox-Ingersoll-Ross driven doubly-stochastic Poisson model is able to describe the medium time correlations observed from the counting process, but a k[superscript]th-order interval analysis reveals that there is more information contained within the snapping than can be described by the model. Analysis of shrimp snap times over a full day provides evidence of correlation between snap events on long time scales. Simulation of ocean noise is conducted to illustrate the use of such temporal models, and implications for their use in detection algorithms are discussed.
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Forcillo, Nicolò. "Free Boundary Regularity of Some Non-Homogeneous Problems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16392/.

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In this work, we deal with the study of some free boundary problems governed by non-homogeneous equations. In particular, we are interested in the regularity of the free boundaries for solutions of one-phase problems associated with non-divergence elliptic operators with variable coefficients.
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Books on the topic "Non-homogeneous"

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Marc, Deschamps, and SpringerLink (Online service), eds. Ultrasonic Wave Propagation in Non Homogeneous Media. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009.

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Muravskii, B. Grigori. Mechanics of Non-Homogeneous and Anisotropic Foundations. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-540-44573-9.

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Leger, Alain, and Marc Deschamps, eds. Ultrasonic Wave Propagation in Non Homogeneous Media. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89105-5.

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Muravskii, B. Grigori. Mechanics of Non-Homogeneous and Anisotropic Foundations. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001.

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Kobayashi, Toshiyuki. On discontinuous group actions on non-Riemannian homogeneous spaces. Kyoto, Japan: Kyōto Daigaku Sūri Kaiseki Kenkyūjo, 2006.

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Wang, Bao-lin. Coupled thermo-electro-magneto-mechanical cracking of non-homogeneous media. New York: Nova Science Publishers, 2008.

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Manolis, George D., Petia S. Dineva, Tsviatko V. Rangelov, and Frank Wuttke. Seismic Wave Propagation in Non-Homogeneous Elastic Media by Boundary Elements. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-45206-7.

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Tolsa, Xavier. Analytic Capacity, the Cauchy Transform, and Non-homogeneous Calderón–Zygmund Theory. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-00596-6.

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Analytic capacity, the Cauchy transform, and non-homogeneous Calderón-Zygmund theory. Heidelberg: Birkhäuser, 2014.

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Karihaloo, B. L., ed. IUTAM Symposium on Analytical and Computational Fracture Mechanics of Non-Homogeneous Materials. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-0081-8.

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Book chapters on the topic "Non-homogeneous"

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Paparrizos, Ioannis. "Homogeneous and Non-homogeneous Algorithms." In Optimization Theory, Decision Making, and Operations Research Applications, 241–48. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5134-1_17.

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Millington, Peter. "Non-Homogeneous Backgrounds." In Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 111–27. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_10.

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Devolder, Pierre, Jacques Janssen, and Raimondo Manca. "Homogeneous and Non-Homogeneous Renewal Models." In Basic Stochastic Processes, 47–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119184584.ch2.

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Altenbach, Holm. "Analysis Of Homogeneous And Non-Homogeneous Plates." In Solid Mechanics And Its Applications, 1–36. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8772-1_1.

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Devolder, Pierre, Jacques Janssen, and Raimondo Manca. "Homogeneous and Non-Homogeneous Semi-Markov Models." In Basic Stochastic Processes, 113–63. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119184584.ch4.

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Pelosi, P., L. Brazzi, and I. Ravagnan. "ARDS Lung: Homogeneous or Non-Homogeneous Impairment?" In Anaesthesia, Pain, Intensive Care and Emergency Medicine — A.P.I.C.E., 249–56. Milano: Springer Milan, 1997. http://dx.doi.org/10.1007/978-88-470-2296-6_19.

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Le Gat, Yves. "Non-Homogeneous Birth Process." In Recurrent Event Modeling Based on the Yule Process, 23–31. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119261285.ch3.

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Brémaud, Pierre. "Non-homogeneous Markov Chains." In Texts in Applied Mathematics, 399–422. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45982-6_12.

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Millington, Peter. "Non-Homogeneous Loop Integrals." In Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 157–70. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_15.

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Banichuk, Nikolay, Juha Jeronen, Pekka Neittaanmäki, Tytti Saksa, and Tero Tuovinen. "Non-Homogeneous Tension Profile." In Mechanics of Moving Materials, 69–88. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01745-7_4.

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Conference papers on the topic "Non-homogeneous"

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Yilmaz, Koray, and K. Mucahit Uner. "Non-Parametric Radar Detection In Homogeneous And Non-Homogeneous Environments." In 2007 IEEE 15th Signal Processing and Communications Applications. IEEE, 2007. http://dx.doi.org/10.1109/siu.2007.4298647.

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Grigoras, Carmen, and Victor Grigoras. "Hyperchaotic Non-homogeneous Neural Network." In 2021 International Symposium on Signals, Circuits and Systems (ISSCS). IEEE, 2021. http://dx.doi.org/10.1109/isscs52333.2021.9497455.

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Vo Tam Van, Chau Yuen, and Jing Li. "Non-homogeneous distributed storage systems." In 2012 50th Annual Allerton Conference on Communication, Control, and Computing (Allerton). IEEE, 2012. http://dx.doi.org/10.1109/allerton.2012.6483346.

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Levant, Arie. "Non-homogeneous finite-time-convergent differentiator." In 2009 Joint 48th IEEE Conference on Decision and Control (CDC) and 28th Chinese Control Conference (CCC). IEEE, 2009. http://dx.doi.org/10.1109/cdc.2009.5400277.

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Abdelrahman, Omer H., and Erol Gelenbe. "Packets travelling in non-homogeneous networks." In the 14th ACM international conference. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/2068897.2068959.

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ILLUMINATI, FABRIZIO, MARCO PATRIARCA, and PASQUALE SODANO. "QUANTUM DISSIPATION IN NON HOMOGENEOUS ENVIRONMENTS." In Proceedings of the International Workshop. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789814503877_0012.

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Mostacciuolo, Elisa, Stephan Trenn, and Francesco Vasca. "Averaging for non-homogeneous switched DAEs." In 2015 54th IEEE Conference on Decision and Control (CDC). IEEE, 2015. http://dx.doi.org/10.1109/cdc.2015.7402665.

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Levant, Arie. "Non-Lyapunov homogeneous SISO control design." In 2017 IEEE 56th Annual Conference on Decision and Control (CDC). IEEE, 2017. http://dx.doi.org/10.1109/cdc.2017.8264661.

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Kraevoy, Vladislav, Alla Sheffer, Ariel Shamir, and Daniel Cohen-Or. "Non-homogeneous resizing of complex models." In ACM SIGGRAPH Asia 2008 papers. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1457515.1409064.

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Saket, A., P. K. Dubey, N. Mishra, S. Dhar, and D. Kandar. "Non homogeneous clutter mitigation using STAP." In 2012 International Conference on Radar, Communication and Computing (ICRCC 2012). IEEE, 2012. http://dx.doi.org/10.1109/icrcc.2012.6450564.

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Reports on the topic "Non-homogeneous"

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Coletti, Alessandro. Signatures from In-situ Light Scattering of Non-Homogeneous Non-Spherical Particles. Fort Belvoir, VA: Defense Technical Information Center, February 1987. http://dx.doi.org/10.21236/ada178761.

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Mitov, Kosto V. Critical Markov Branching Processes with Non-homogeneous Poisson Immigration. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, July 2020. http://dx.doi.org/10.7546/crabs.2020.07.02.

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Snyder, Wesley E. Active Contours for Multispectral Images With Non-Homogeneous Sub-Regions. Fort Belvoir, VA: Defense Technical Information Center, September 2005. http://dx.doi.org/10.21236/ada440479.

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Rangaswamy, Muralidhar. Space-Time Adaptive Processing (STAP) Performance in Non-Homogeneous Radar Clutter. Fort Belvoir, VA: Defense Technical Information Center, November 2001. http://dx.doi.org/10.21236/ada398137.

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Rusek, J. J., M. K. Minthorn, N. L. Purcell, T. C. Pavia, and J. R. Grote. Non-Toxic Homogeneous Miscible Fuel (NHMF) Development for Hypergolic Bipropellant Engines,. Fort Belvoir, VA: Defense Technical Information Center, January 1996. http://dx.doi.org/10.21236/ada329058.

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Marengo, Edwin A., and Anthony Devaney. Inverse Source Problem in Non-homogeneous and Metamaterial Background Media: Antenna Synthesis and Performance Bounds. Fort Belvoir, VA: Defense Technical Information Center, February 2009. http://dx.doi.org/10.21236/ada496252.

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Hart, Carl, and Gregory Lyons. A tutorial on the rapid distortion theory model for unidirectional, plane shearing of homogeneous turbulence. Engineer Research and Development Center (U.S.), July 2022. http://dx.doi.org/10.21079/11681/44766.

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The theory of near-surface atmospheric wind noise is largely predicated on assuming turbulence is homogeneous and isotropic. For high turbulent wavenumbers, this is a fairly reasonable approximation, though it can introduce non-negligible errors in shear flows. Recent near-surface measurements of atmospheric turbulence suggest that anisotropic turbulence can be adequately modeled by rapid-distortion theory (RDT), which can serve as a natural extension of wind noise theory. Here, a solution for the RDT equations of unidirectional plane shearing of homogeneous turbulence is reproduced. It is assumed that the time-varying velocity spectral tensor can be made stationary by substituting an eddy-lifetime parameter in place of time. General and particular RDT evolution equations for stochastic increments are derived in detail. Analytical solutions for the RDT evolution equation, with and without an effective eddy viscosity, are given. An alternative expression for the eddy-lifetime parameter is shown. The turbulence kinetic energy budget is examined for RDT. Predictions by RDT are shown for velocity (co)variances, one-dimensional streamwise spectra, length scales, and the second invariant of the anisotropy tensor of the moments of velocity. The RDT prediction of the second invariant for the velocity anisotropy tensor is shown to agree better with direct numerical simulations than previously reported.
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Waganet, R. J., John Duxbury, Uri Mingelgrin, John Hutson, and Zev Gerstl. Consequences of Nonequilibrium Pesticide Fate Processes on Probability of Leaching from Agricultural Lands. United States Department of Agriculture, January 1994. http://dx.doi.org/10.32747/1994.7568769.bard.

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Pesticide leaching in heterogeneous field soils is relatively unstudied and is the focus of this project. A wide variety of heterogeneous soils exist, characterized by processes that result from the presence of structural cracks, worm holes, and other preferred pathways within which the majority of transport can occur (called physical non-equilibrium processes), along with the presence of sorption processes that are both equilibrium and kinetic (chemical non-equilibrium processes). Previous studies of pesticide leaching have focused primarily on relatively homogeneous soils, which are less widely distributed in nature, but more studied due to the relative ease with which quantitative theory can be applied to interpret experimental results. The objectives of the proposed project were: first, to gain greater insight into the basic physical and chemical processes that characterize non-equilibrium systems, second, to improve our ability to predict pesticide leaching in heterogeneous field soils, and third, to estimate the consequences of non-equilibrium processes at the field scale by conducting an analysis of the probability of pesticide leaching when non-equilibrium processes prevail. The laboratory, theoretical and modelling aspects of the project were successful; the field aspects less so. We gained greater insight into basic processes in heterogeneous field soils, and we improved and tested tools (simulation models) and the methodology of using such tools for assessing the probability of pesticide leaching as a contribution to broader risk analysis efforts.
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9

Wallach, Rony, Tammo Steenhuis, Ellen R. Graber, David DiCarlo, and Yves Parlange. Unstable Flow in Repellent and Sub-critically Repellent Soils: Theory and Management Implications. United States Department of Agriculture, November 2012. http://dx.doi.org/10.32747/2012.7592643.bard.

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Water repellency causes unstable wetting fronts that result in water moving in preferential flowpaths through homogeneous soils as well in structured soils where macropores enhance the preferential flow pattern. Water repellency is typically associated with extended water ponding on the soil surface, but we have found that repellency is important even before the water ponds. Preferential flow fingers can form under conditions where the contact angle is less than 90o, but greater than 0o. This means that even when the soil is considered wettable (i.e., immediate penetration of water), water distribution in the soil profile can be significantly non-uniform. Our work concentrated on various aspects of this subject, with an emphasis on visualizing water and colloid flow in soil, characterizing mathematically the important processes that affect water distribution, and defining the chemical components that are important for determining contact angle. Five papers have been published to date from this research, and there are a number of papers in various stages of preparation.
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10

Pullammanappallil, Pratap, Haim Kalman, and Jennifer Curtis. Investigation of particulate flow behavior in a continuous, high solids, leach-bed biogasification system. United States Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7600038.bard.

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Recent concerns regarding global warming and energy security have accelerated research and developmental efforts to produce biofuels from agricultural and forestry residues, and energy crops. Anaerobic digestion is a promising process for producing biogas-biofuel from biomass feedstocks. However, there is a need for new reactor designs and operating considerations to process fibrous biomass feedstocks. In this research project, the multiphase flow behavior of biomass particles was investigated. The objective was accomplished through both simulation and experimentation. The simulations included both particle-level and bulk flow simulations. Successful computational fluid dynamics (CFD) simulation of multiphase flow in the digester is dependent on the accuracy of constitutive models which describe (1) the particle phase stress due to particle interactions, (2) the particle phase dissipation due to inelastic interactions between particles and (3) the drag force between the fibres and the digester fluid. Discrete Element Method (DEM) simulations of Homogeneous Cooling Systems (HCS) were used to develop a particle phase dissipation rate model for non-spherical particle systems that was incorporated in a two-fluid CFDmultiphase flow model framework. Two types of frictionless, elongated particle models were compared in the HCS simulations: glued-sphere and true cylinder. A new model for drag for elongated fibres was developed which depends on Reynolds number, solids fraction, and fibre aspect ratio. Schulze shear test results could be used to calibrate particle-particle friction for DEM simulations. Several experimental measurements were taken for biomass particles like olive pulp, orange peels, wheat straw, semolina, and wheat grains. Using a compression tester, the breakage force, breakage energy, yield force, elastic stiffness and Young’s modulus were measured. Measurements were made in a shear tester to determine unconfined yield stress, major principal stress, effective angle of internal friction and internal friction angle. A liquid fludized bed system was used to determine critical velocity of fluidization for these materials. Transport measurements for pneumatic conveying were also assessed. Anaerobic digestion experiments were conducted using orange peel waste, olive pulp and wheat straw. Orange peel waste and olive pulp could be anaerobically digested to produce high methane yields. Wheat straw was not digestible. In a packed bed reactor, anaerobic digestion was not initiated above bulk densities of 100 kg/m³ for peel waste and 75 kg/m³ for olive pulp. Interestingly, after the digestion has been initiated and balanced methanogenesis established, the decomposing biomass could be packed to higher densities and successfully digested. These observations provided useful insights for high throughput reactor designs. Another outcome from this project was the development of low cost devices to measure methane content of biogas for off-line (US$37), field (US$50), and online (US$107) applications.
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