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Bibliografie tematiche / Processus de Zero-Range

Letteratura scientifica selezionata sul tema "Processus de Zero-Range"

Autore: Grafiati

Pubblicato: 6 luglio 2024

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Articoli di riviste sul tema "Processus de Zero-Range":

1

Jeon, Intae. "Condensation in perturbed zero-range processes". Journal of Physics A: Mathematical and Theoretical 44, n. 25 (23 maggio 2011): 255002. http://dx.doi.org/10.1088/1751-8113/44/25/255002.

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2

Godrèche, Claude, e Jean-Michel Drouffe. "Coarsening dynamics of zero-range processes". Journal of Physics A: Mathematical and Theoretical 50, n. 1 (29 novembre 2016): 015005. http://dx.doi.org/10.1088/1751-8113/50/1/015005.

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3

Maes, C., e F. Redig. "Long-range spatial correlations for anisotropic zero-range processes". Journal of Physics A: Mathematical and General 24, n. 18 (21 settembre 1991): 4359–73. http://dx.doi.org/10.1088/0305-4470/24/18/022.

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4

Uchiyama, Kôhei. "Equilibrium Fluctuations for Zero-Range-Exclusion Processes". Journal of Statistical Physics 115, n. 5/6 (giugno 2004): 1423–60. http://dx.doi.org/10.1023/b:joss.0000028065.88090.af.

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5

del Molino, L. C. G., P. Chleboun e S. Grosskinsky. "Condensation in randomly perturbed zero-range processes". Journal of Physics A: Mathematical and Theoretical 45, n. 20 (4 maggio 2012): 205001. http://dx.doi.org/10.1088/1751-8113/45/20/205001.

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6

Jeon, Intae. "CONDENSATION IN DENSITY DEPENDENT ZERO RANGE PROCESSES". Journal of the Korea Society for Industrial and Applied Mathematics 17, n. 4 (25 dicembre 2013): 267–78. http://dx.doi.org/10.12941/jksiam.2013.17.267.

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7

Benois, O., A. Koukkous e C. Landim. "Diffusive behavior of asymmetric zero-range processes". Journal of Statistical Physics 87, n. 3-4 (maggio 1997): 577–91. http://dx.doi.org/10.1007/bf02181237.

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8

Seo, Insuk. "Condensation of Non-reversible Zero-Range Processes". Communications in Mathematical Physics 366, n. 2 (10 febbraio 2019): 781–839. http://dx.doi.org/10.1007/s00220-019-03346-2.

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9

Jankowski, Hanna, Jeremy Quastel e John Sheriff. "Central Limit Theorem for Zero-Range Processes". Methods and Applications of Analysis 9, n. 3 (2002): 393–406. http://dx.doi.org/10.4310/maa.2002.v9.n3.a6.

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10

Godr che, C. "Dynamics of condensation in zero-range processes". Journal of Physics A: Mathematical and General 36, n. 23 (28 maggio 2003): 6313–28. http://dx.doi.org/10.1088/0305-4470/36/23/303.

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Più fonti

Tesi sul tema "Processus de Zero-Range":

1

Tran, Hong Quan. "Cutoff phenomenon for some interacting particle systems". Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLD007.

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Abstract (sommario):

Sur un espace d’états fini, une chaîne de Markov irréductible à temps continu converge vers sa mesure stationnaire unique, ou en d’autres termes, se mélange. La convergence est mesurée par rapport à la distance en variation totale. Dans la théorie moderne des chaînes de Markov, nous nous intéressons aux chaînes où l’espace d’états devient grand. En étudiant certains modèles de mélange de cartes, Aldous, Diaconis et Shashahani ont découvert le phénomène remarquable maintenant connu sous le nom de cutoff : lorsque l’espace d’états devient grand, la distance entre la chaîne et l’équilibre reste proche de sa valeur maximale pendant une longue période, puis chute soudainement vers zéro sur une échelle de temps beaucoup plus courte. Depuis, le phénomène de cutoff a été observé dans de nombreux contextes différents, tels que les chaînes de naissance et de mort, les systèmes de spin à haute température, les systèmes de particules en interaction, etc. Malgré l’accumulation de modèles, il n’existe pas encore de théorie générale permettant de prédire efficacement cutoff. Au lieu de cela, le cutoff est montré modèle par modèle. Dans cette thèse, nous étudions trois systèmes de particules en interaction: le processus d’exclusion unidimensionnel avec réservoirs, le processus de Glauber-Exclusion dans le régime à haut température, et le processus de Zero-Range à champ-moyen avec potentiel croissant sous-linéairement. Pour chaque modèle, nous établissons cutoff et fournissons une estimation fine pour le trou spectral. Nous nous concentrons particulièrement sur le cadre de la percolation de l’information introduit par Lubetzky et Sly, qui nous permet de montrer le cutoff même sans connaître la formule explicite de la mesure invariante
On a finite state space, an irreducible continuous-time Markov chain converges to its unique stationary measure, or in other words, mixes. The convergence is often measured by the total variation distance. In the modern theory of Markov Chains, we are interested in the case where the state space becomes large. When studying some models of card shuffling, Aldous, Diaconis, and Shashahani discovered a remarkable phenomenon now known as cutoff: as the state space becomes large, the distance between the chain and equilibrium stays close to its maximal value for a long time and then suddenly drops to near zero in a much shorter time scale. Since then, the cutoff phenomenon has been observed in many different contexts, such as birth and death chains, high-temperature spin systems, interacting particle systems, etc. Despite the accumulation of models, there is not yet a general theory to effectively predict cutoff. Instead, cutoff is proved model by model.In this thesis, we study three models : the one-dimensional Exclusion process with reservoirs, the Glauber-Exclusion process in the high-temperature regime, and the mean-field Zero-Range process with increasing sublinear potential. These three models all fall under the category of interacting particle systems. For each model, we establish cutoff and provide a sharp estimate on the spectral gap. We particularly focus on the information percolation framework introduced by Lubetzky and Sly, which allows us to show cutoff even without knowing the explicit formula of the invariant measure

2

Thompson, Alasdair Graham. "Lattice models of pattern formation in bacterial dynamics". Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/6248.

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In this thesis I study a model of self propelled particles exhibiting run-and tumble dynamics on lattice. This non-Brownian diffusion is characterised by a random walk with a finite persistence length between changes of direction, and is inspired by the motion of bacteria such as Escherichia coli. By defining a class of models with multiple species of particle and transmutation between species we can recreate such dynamics. These models admit exact analytical results whilst also forming a counterpart to previous continuum models of run-and- tumble dynamics. I solve the externally driven non-interacting and zero-range versions of the model exactly and utilise a field theoretic approach to derive the continuum fluctuating hydrodynamics for more general interactions. I make contact with prior approaches to run-and-tumble dynamics of lattice and determine the steady state and linear stability for a class of crowding interactions, where the jump rate decreases as density increases. In addition to its interest from the perspective of nonequilibrium statistical mechanics, this lattice model constitutes an efficient tool to simulate a class of interacting run-and-tumble models relevant to bacterial motion. Pattern formation in bacterial colonies is confirmed to be able to stem solely from the interplay between a diffusivity that depends on the local bacterial density and regulated division of the cells, in particular without the need for any explicit chemotaxis. This simple and generic mechanism thus provides a null hypothesis for pattern formation in bacterial colonies which has to be falsified before appealing to more elaborate alternatives. Most of the literature on bacterial motility relies on models with instantaneous tumbles. As I show, however, the finite tumble duration can play a major role in the patterning process. Finally a connection is made to some real experimental results and the population ecology of multiple species of bacteria competing for the same resources is considered.

3

Marahrens, Daniel. "On some nonlinear partial differential equations for classical and quantum many body systems". Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244203.

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This thesis deals with problems arising in the study of nonlinear partial differential equations arising from many-body problems. It is divided into two parts: The first part concerns the derivation of a nonlinear diffusion equation from a microscopic stochastic process. We give a new method to show that in the hydrodynamic limit, the particle densities of a one-dimensional zero range process on a periodic lattice converge to the solution of a nonlinear diffusion equation. This method allows for the first time an explicit uniform-in-time bound on the rate of convergence in the hydrodynamic limit. We also discuss how to extend this method to the multi-dimensional case. Furthermore we present an argument, which seems to be new in the context of hydrodynamic limits, how to deduce the convergence of the microscopic entropy and Fisher information towards the corresponding macroscopic quantities from the validity of the hydrodynamic limit and the initial convergence of the entropy. The second part deals with problems arising in the analysis of nonlinear Schrödinger equations of Gross-Pitaevskii type. First, we consider the Cauchy problem for (energy-subcritical) nonlinear Schrödinger equations with sub-quadratic external potentials and an additional angular momentum rotation term. This equation is a well-known model for superfluid quantum gases in rotating traps. We prove global existence (in the energy space) for defocusing nonlinearities without any restriction on the rotation frequency, generalizing earlier results given in the literature. Moreover, we find that the rotation term has a considerable influence in proving finite time blow-up in the focusing case. Finally, a mathematical framework for optimal bilinear control of nonlinear Schrödinger equations arising in the description of Bose-Einstein condensates is presented. The obtained results generalize earlier efforts found in the literature in several aspects. In particular, the cost induced by the physical work load over the control process is taken into account rather then often used L^2- or H^1-norms for the cost of the control action. We prove well-posedness of the problem and existence of an optimal control. In addition, the first order optimality system is rigorously derived. Also a numerical solution method is proposed, which is based on a Newton type iteration, and used to solve several coherent quantum control problems.

4

Gannon, Mark Andrew. "Passeios aleatórios em redes finitas e infinitas de filas". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-16102017-154842/.

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Um conjunto de modelos compostos de redes de filas em grades finitas servindo como ambientes aleatorios para um ou mais passeios aleatorios, que por sua vez podem afetar o comportamento das filas, e desenvolvido. Duas formas de interacao entre os passeios aleatorios sao consideradas. Para cada modelo, e provado que o processo Markoviano correspondente e recorrente positivo e reversivel. As equacoes de balanceamento detalhado sao analisadas para obter a forma funcional da medida invariante de cada modelo. Em todos os modelos analisados neste trabalho, a medida invariante em uma grade finita tem forma produto. Modelos de redes de filas como ambientes para multiplos passeios aleatorios sao estendidos a grades infinitas. Para cada modelo estendido, sao especificadas as condicoes para a existencia do processo estocastico na grade infinita. Alem disso, e provado que existe uma unica medida invariante na rede infinita cuja projecao em uma subgrade finita e dada pela medida correspondente de uma rede finita. Finalmente, e provado que essa medida invariante na rede infinita e reversivel.
A set of models composed of queueing networks serving as random environments for one or more random walks, which themselves can affect the behavior of the queues, is developed. Two forms of interaction between the random walkers are considered. For each model, it is proved that the corresponding Markov process is positive recurrent and reversible. The detailed balance equa- tions are analyzed to obtain the functional form of the invariant measure of each model. In all the models analyzed in the present work, the invariant measure on a finite lattice has product form. Models of queueing networks as environments for multiple random walks are extended to infinite lattices. For each model extended, the conditions for the existence of the stochastic process on the infinite lattice are specified. In addition, it is proved that there exists a unique invariant measure on the infinite network whose projection on a finite sublattice is given by the corresponding finite- network measure. Finally, it is proved that that invariant measure on the infinite lattice is reversible.

5

Feng, Fan-fu. "On the totally asymmetric zero range processes /". 2005. http://wwwlib.umi.com/dissertations/gateway.

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Thesis (Ph. D.)--New York University, Graduate School of Arts and Science, 2005.
Typescript. Includes bibliographical references (leaf 120). Also available in electronic format on the World Wide Web. Access restricted to users affiliated with the licensed institutions.

6

Wu, Fong-Min, e 吳峰岷. "Occupation time large deviations for zero range processes". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/26542360757160491330.

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碩士
國立臺灣大學
數學研究所
95
In this paper, we investigate occupation time large deviations for one dimensional mean zero asymmetric zero range processes. Applying contraction principle to large deviations of empirical measureas, we derive a lower bound of occupation time large deviation.

7

Wu, Fong-Min. "Occupation time large deviations for zero range processes". 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-0307200708330700.

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Libri sul tema "Processus de Zero-Range":

1

Borodin, Alexei, e Leonid Petrov. Integrable probability: stochastic vertex models and symmetric functions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797319.003.0002.

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This chapter presents the study of a homogeneous stochastic higher spin six-vertex model in a quadrant. For this model concise integral representations for multipoint q-moments of the height function and for the q-correlation functions are derived. At least in the case of the step initial condition, these formulas degenerate in appropriate limits to many known formulas of such type for integrable probabilistic systems in the (1+1)d KPZ universality class, including the stochastic six-vertex model, ASEP, various q-TASEPs, and associated zero-range processes. The arguments are largely based on properties of a family of symmetric rational functions that can be defined as partition functions of the higher spin six-vertex model for suitable domains; they generalize classical Hall–Littlewood and Schur polynomials. A key role is played by Cauchy-like summation identities for these functions, which are obtained as a direct corollary of the Yang–Baxter equation for the higher spin six-vertex model.

Capitoli di libri sul tema "Processus de Zero-Range":

1

Landim, Claudio. "Hydrodynamic Equation for Mean Zero Asymmetric Zero Range Processes". In Cellular Automata and Cooperative Systems, 395–402. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1691-6_31.

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2

Taiebat, Mahdi, e Yannis F. Dafalias. "A Zero Elastic Range Hypoplasticity Model for Sand". In Holistic Simulation of Geotechnical Installation Processes, 237–56. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52590-7_10.

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3

Kipnis, Claude, e Claudio Landim. "An Example of Reversible Gradient System: Symmetric Zero Range Processes". In Grundlehren der mathematischen Wissenschaften, 67–114. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03752-2_6.

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4

Ferrari, Pablo A., e Valentin V. Sisko. "Escape of mass in zero-range processes with random rates". In Institute of Mathematical Statistics Lecture Notes - Monograph Series, 108–20. Beachwood, Ohio, USA: Institute of Mathematical Statistics, 2007. http://dx.doi.org/10.1214/074921707000000300.

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5

Griffith, Luke. "Engaging the “Defective Vending Machine”". In Unraveling the Gray Area Problem, 95–115. Cornell University Press, 2023. http://dx.doi.org/10.7591/cornell/9781501773068.003.0006.

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This chapter provides an overview of the Intermediate-Range Nuclear Forces (INF) negotiations of the Reagan administration. It explains how the zero option was President Reagan's way of getting the Soviet intermediate-range missiles out of Europe. To enhance US bargaining leverage, American policymakers planned to implement the basing program. The chapter cites how the Reagan administration remained mindful of European politics amidst the negotiation process. However, President Reagan typically stuck to his principles of distrusting the Soviet leadership and demanded a global INF agreement with stringent verification provisions. The chapter then highlights how the INF Treaty with Moscow remained in a deadlock.

6

Cruickshank, Steven. "What is a function?" In Mathematics and Statistics in Anaesthesia, 97–98. Oxford University PressNew York, NY, 1998. http://dx.doi.org/10.1093/oso/9780192623133.003.0021.

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Abstract We use the idea of a function throughout this book, but what do we mean by a ‘function’? We will treat a function as a rule that transforms one set of real numbers to another set of real numbers. The function is a process; we feed in a value at one end and the function rule generates an output value at the other end. We may need to be rather particular about defining the range of values that we may input into the function; for instance, the function x) = 1/(x) is undefined at x = 0, and we must restrict the input range when defining the function to exclude x = 0, since it is impossible to divide by zero.

7

Dong, PengBo. "Internal Flow and Spray Dynamics of Multi-Hole Nozzle". In Droplet Dynamics [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104601.

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Faced with dual challenges of “carbon neutral” and emission control, fossil fuel-based internal combustion engines need to explore new ways and technical paths to reduce harmful emissions and Carbon dioxide emissions simultaneously. Fuel injection process is playing a significant role not only in traditional engines but also in new low/zero carbon engines. Multi-hole nozzles have a wide range of applications in the fuel supply system. While the accepted spray study work and jet break-up models are usually developed under the quasi-steady-state of fuel injection by a single-hole nozzle. There are rare models that can describe the whole break-up processes of multi-hole nozzle spray, including complex internal flow factors, plume interaction, and the effect of start/end of injection. In this chapter, characteristics of spray morphology, evolution processes, and evaporation characteristics, emerging from the practical diesel multi-hole nozzles, were discussed and analyzed during the transient injection processes in detail. Moreover, the relationship between multi-hole nozzle internal flow properties and the corresponding spray behaviors was investigated by numerical simulation method systematically. Therefore, multi-hole spray modeling processes under engine operating conditions and the optimized design of diesel multi-hole nozzles are expected to get some benefits and clues from the current results.

8

Hlastala, Michael P., e Albert J. Berger. "Pulmonary Gas Exchange". In Physiology of Respiration, 114–33. Oxford University PressNew York, NY, 2001. http://dx.doi.org/10.1093/oso/9780195138467.003.0007.

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Abstract Ventilation delivers O2 to and removes CO2 from the lung. The circulation transports O2 and CO2 between the lung and the peripheral tissue. The mechanisms for the exchange of O2 and CO2 between the alveolar gas and pulmonary capillary blood are the subject of this chapter. These passive mechanisms can be influenced by outside factors, such as gravity and barometric pressure, and they are altered by most respiratory diseases. The factors determining efficiency of the exchange process can be separated into two major components: diffusion and matching of ventilation to perfusion (V)QJ. Furthermore, diffusion can be divided into three components: the gas phase, the alveolocapillary membrane, and the blood. The VA/Q ratio spans a broad range from zero (shunt, no ventilation) to infinity (dead space, no perfusion). Shunt is discussed as a special entity, although it represents only the extreme lower limit of the VA/Q range.

9

"Applying Formalism". In Videogame Formalism. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland: Amsterdam University Press, 2023. http://dx.doi.org/10.5117/9789463720663_ch05.

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In this chapter, we apply the formalist approach to videogame analysis, for which we laid the groundwork in chapters 1–3 and further described in chapter 4, to two case studies: Kentucky Route Zero, which is often considered to be an art game, and The Legend of Zelda: Breath of the Wild, a mainstream AAA game. We demonstrate in detail the steps involved in the process, from the initial aspects of the game that intrigue the player critic, through to the identification of devices, defamiliarization, and the dominant. We provide examples of how this process starts from the player’s aesthetic experience and takes the context of play into consideration. Through the analysis of these two very different games, we demonstrate the range and diversity of possible applications of our videogame formalism.

10

Saunders, Nigel, e Richard Smith. "Case study: Environmental planning in a post-COVID-19 world". In COVID-19 and Social Determinants of Health, a cura di Adrian Bonner, 319–25. Policy Press, 2023. http://dx.doi.org/10.1332/policypress/9781447364948.003.0023.

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Nigel Saunders, Director at Pozzoni Architecture, considers whether recent developments to the procurement of environmental design and construction services, driven by a mixture of new government policies, the national response to the 2020 COVID-19 pandemic, and ambitions to reach net-zero carbon by 2050, go far enough. He explores emerging techniques for the assessment of ‘value’ during the procurement of contracts, advocating that there are a wide range of assessment criteria that should form the bedrock of subsequent successful relationships. With fundamental questions remaining around hidden costs and who should carry the losses associated with tendering processes in construction, design and planning, as well as other key industries such as healthcare, he encourages a sustainable model of public–private relationalism that is focused on transparent partnerships with purpose and longevity.

Atti di convegni sul tema "Processus de Zero-Range":

1

Bogacz, L., Z. Burda, W. Janke e B. Waclaw. "Free zero-range processes on networks". In SPIE Fourth International Symposium on Fluctuations and Noise, a cura di János Kertész, Stefan Bornholdt e Rosario N. Mantegna. SPIE, 2007. http://dx.doi.org/10.1117/12.726304.

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2

Kobayashi, Koichi, e Keisuke Yamazaki. "Parameter estimation accuracy and active learning in the zero-range process". In 2012 12th International Conference on Intelligent Systems Design and Applications (ISDA). IEEE, 2012. http://dx.doi.org/10.1109/isda.2012.6416641.

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3

Wähler, Tobias, e Peter Dress. "Road to a zero degree total temperature range post exposure bake process". In Photomask Technology, a cura di Hiroichi Kawahira e Larry S. Zurbrick. SPIE, 2008. http://dx.doi.org/10.1117/12.801369.

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4

Xu, Jia. "Pre-Run-Time Scheduling of Asynchronous and Periodic Processes With Offsets, Release Times, Deadlines, Precedence and Exclusion Relations". In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87769.

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Utilizing non-zero offsets when scheduling real-time periodic processes significantly increases the chances of satisfying all the timing constraints in a real-time system. In this paper, a method that enables the utilization of non-zero offsets in the pre-run-time scheduling of asynchronous and periodic processes with release times, deadlines, precedence and exclusion relations on either a uniprocessor or on a multiprocessor in real-time embedded systems is presented. This paper also identifies for the first time, the set of general conditions that a periodic process newpi with release time rnewpi, computation time cnewpi, deadline dnewpi, period prdnewpi, permitted range of offset onewpi, must satisfy, in order to satisfy the timing constraints of any given asynchronous process ai with computation time cai, deadline dai, minimum time between two consecutive requests minai, and earliest time that asynchronous process ai can make a request for execution lai. A method based on these general conditions for converting asynchronous processes with earliest request times into new periodic processes with offset constraints is also introduced.

5

Um, Soyeon, Sangjin Kim, Seongyon Hong, Sangyeob Kim e Hoi-Jun Yoo. "LOG-CIM: A 116.4 TOPS/W Digital Computing-In-Memory Processor Supporting a Wide Range of Logarithmic Quantization with Zero-Aware 6T Dual-WL Cell". In 2023 IEEE Asian Solid-State Circuits Conference (A-SSCC). IEEE, 2023. http://dx.doi.org/10.1109/a-sscc58667.2023.10347959.

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6

Perry, J., e M. Perl. "Selecting Material Properties for Maximizing Gun Firing Power". In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28002.

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The design of gun barrels aims at maximizing its firing power determined by its SMP — the maximal allowed firing pressure, which is considerably enhanced by inducing a favorable residual stress field through the barrel’s wall commonly by the autofrettage process. Presently, there are two distinct processes: hydrostatic and swage autofrettage. In both processes the barrel’s material is fully or partially plastically deformed. Recently, a 3-D code was developed, which finally enables a realistic simulation of both swage and hydraulic autofrettage, using the experimentally measured stress-strain curve, and incorporating the Bauschinger effect. This code enables a detailed analysis of all the factors involving the final SMP of a barrel, and it can be used to establish the optimal process for any gun barrel design. A major outcome of this analysis was the fact that the SMP of an autofrettaged barrel is dictated by the detailed plastic characteristics on the barrel’s material. The main five plastic parameters of the material that have been identified are: the exact (zero offset) value of the yield stress, the universal plastic curve in tension and in compression, the Bauschinger Effect Factor (BEF) curve, and the Elastic-Plastic Transition Range (EPTR). A detailed analysis of these three materials points to the fact that the major parameter determining the barrel’s SMP is the yield stress of the material and that the best way to determine it is by the newly developed “zero offset” method. All these four parameters have a greater influence on the SMP of an hydraulically autofrettaged barrel than on a swaged one.

7

G. Giorges, Aklilu, e Comas Haynes. "Applied Experimental Work Designed to Evaluate the Fundamental Heat Transfer From Rotation Only and Rotation and Translation Motion due to Complex Shapes". In ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-111610.

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Abstract An ongoing objective of food processors is to achieve efficiency without compromising food safety and quality standards. The food production environment is designed to produce specific products with a balance of resources, environment, human labor, automation, quality, and safety while also maximizing productivity and profitability. Energy efficiency plays a major role in food processing, and the heating and cooling processes are continually evolving. In poultry processing, where heterogeneous and complex-shaped products are processed, the thermal process cannot be easily predicted based on previous work done primarily with well-defined shapes and material properties. To understand the fundamentals of this complex system of heat transfer, applied experimental work is designed. It is designed to evaluate the flow type effect while keeping all the other features similar. The current work assesses the degree of differences and similarities between two motions: 1. Rotational system and 2. Rotational and translational system, which represent the in-line industrial water chilling system in practice. The test chicken carcasses were prepared by placing thermocouples at the core of the breast meat while suspended by the leg on the shackle. The cooling process was studied for motion of continually changing rotational direction with two revolutions in clockwise and counterclockwise directions for the duration of the test, with a rotational speed of 1 Hz and a near-zero-degree medium. The results showed a similar cooling profile. Furthermore, the statistical analysis of the data showed that, for the mass range test, the results were not statistically different. Since rotational only test requires less resources, the simpler rotational-only test can be used as a surrogate to evaluate some industrial processing conditions and treatments.

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Temizel, Cenk, Cengiz Yegin, F. Bahar Hosgor, Hakki Aydin e Shah Kabir. "Exploring Green Energy Applications in the Oil and Gas Industry". In SPE Canadian Energy Technology Conference. SPE, 2022. http://dx.doi.org/10.2118/208900-ms.

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Abstract With the ongoing paradigm shift in the Oil and Gas industry towards greener alternatives with net-zero objectives, several developing technologies have been recently deployed or proposed as promising solutions. The overall goals are to decrease carbon footprint and improve the projects’ economics and net present value (NPV). This study outlines the latest developments with underlying principles, practices, and economics. This holistic approach encompasses the overall feasibility with the challenges and the benefits. A comprehensive literature survey has been carried out on publicly available data to provide the theoretical background, rationale of use, screening and selection criteria, difficulties, and the workarounds. Systems to integrate the green methods with the respective oil and gas processes appear in detail, from screening to implementation. We outline economics under various scenarios with CAPEX methods and OPEX-intensive approaches to maximize the NPV. The technical details of the integration under multiple conditions that affect the system's efficiency, such as weather, seasonal temperature changes, wind, and solar exposure, have been investigated. Efficient integration of the selected green methods with the associated oil and gas process proves to be a concrete step towards a net-zero objective. Such integration brings additional benefits of improved economics with minimal effects in terms of capital intensiveness or other burdens on the overall economics. These items range from solar thermal applications in heavy oil recovery to heat recovery from the produced fluids, biomass, geothermal, wind, and wave for offshore processes. Cases with multigreen energy methods, such as solar and heat recovery, demonstrate promising outcomes. This article examines some of the latest green methods with various aspects corresponding to the selected oil and gas processes. We specifically focus on energy generation through standalone green methods and extracting energy from oil and gas processes in a greenway. The overall objective is to close the current gap in the literature.

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Sullivan, Anthony, Anil Saigal, Roselita Fragoudakis, Michael A. Zimmerman e Arash Ahmadzadegan. "Quantifying the Directionality of Liquid Crystalline Polymers in Extrusion Processes Using an Order Parameter". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52658.

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Liquid crystalline polymers (LCPs) are among a high-performance class of materials, which derive unique mechanical, chemical, and electrical characteristics from their long-range molecular order. The evolution of anisotropic orientation in the LCP microstructure during processing, however, can adversely affect the macroscopic polymer behavior. Simulation of this anisotropy is crucial to the design of manufacturing processes producing the desired material properties, and the ability to quantify the polymer directionality is a necessary metric of the model. Using a Monte-Carlo approach introduced by Goldbeck-Wood et al., a practical method for simulating LCP orientation is used to model the polymer flow, and the directionality results are then used to calculate a quantitative molecular degree of order. This metric, known as the order parameter, is an ideal candidate for measuring the LCP orientation, ranging from zero to unity between the isotropic and perfectly aligned states, respectively, as it is sensitive to both the direction of the average molecular orientation, as well as to the distribution of crystals around the average orientation. The effects of varying process parameters in the directionality model on the order parameter are shown. Understanding of these relationships will ultimately drive the design of manufacturing processes for more isotropic materials.

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Langenstein, Magnus, e Jan Hansen-Schmidt. "The Worlds’ First Ever Cooling Tower Acceptance Test Using Process Data Reconciliation". In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89643.

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The cooling capacity of cooling towers is influenced by multiple constructive and atmospheric parameters in a very complex way. This leads to strong variations of the measured cold-water temperature and causes unacceptable unreliability of conventional acceptance tests, which are based on single point measurements. In order to overcome this lack of accuracy a new approach to acceptance test based on process data reconciliation has been developed by BTB Jansky and applied at a nuclear power plant. This approach uses process data reconciliation according to VDI 2048 [1, 2] to evaluate datasets over a long period covering different operating conditions of the cooling tower. Data reconciliation is a statistical method to determine the true process parameters with a statistical probability of 95% by considering closed material-, mass- and energy balances. Datasets which are not suitable for the evaluation due to strong transient gradients are excluded beforehand, according to well-defined criteria. The reconciled cold-water temperature is then compared, within a wet bulb temperature range of 5°C to 20°C to the manufacturer’s guaranteed temperature. Finally, if the average deviation between reconciled and guaranteed value over the evaluated period is below zero, the cooling tower guarantee is fulfilled.

Rapporti di organizzazioni sul tema "Processus de Zero-Range":

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Hayat, Muhammad Adnan, Khalid Alhadhrami e Amro Elshurafa. Challenges and Opportunities for Sustainable Deployment of Bioenergy with Carbon Capture and Storage Pathways (BECCS) Globally. King Abdullah Petroleum Studies and Research Center, novembre 2023. http://dx.doi.org/10.30573/ks--2023-dp28.

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Countries are exploring various options to achieve net-zero emissions, including bioenergy with carbon capture and storage (BECCS), which is the process of capturing and storing carbon dioxide (CO2) from processes that utilize bioenergy to produce heat, electricity or biofuels. However, this technology faces sustainability concerns, an unclear public perception and has complex value chains for its emissions. Adding to this complexity, the literature presents two opposing views regarding the potential of BECCS to achieve negative emissions. This paper analyzes in detail a wide range of BECCS pathways in terms of their ability to achieve negative emissions and their associated costs. Out of the seven assessed pathways, our analysis shows that the corn-to-ethanol and biomethane-production-from-maize BECCS pathways in the U.S., along with biomethane production from wet manure in Europe and baling of straw pellets with trans-Atlantic shipment, can achieve negative emissions at a cost of 50, 108, 159 and 232 dollars per ton of CO2 ($/tCO2), respectively. Other technologies, such as poplar pellets, forest residue and agricultural residue with trans-Atlantic shipments, are not able to achieve negative emissions.

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Potts, Tavis, e Rebecca Ford. Leading from the front? Increasing Community Participation in a Just Transition to Net Zero in the North-East of Scotland. Scottish Universities Insight Institute, dicembre 2022. http://dx.doi.org/10.57064/2164/19722.

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n line with Scottish Net Zero targets and the national strategy for a Just Transition, the Northeast of Scotland is transforming towards a low carbon future with a number of high-profile industry and policy initiatives. With the region home to global energy companies and historical high levels of energy sector employment, the narrative on transition is predominantly framed within an industrial and technological context, including narratives on new opportunities in green jobs, green industrial development, technical innovation and new infrastructure to support energy transition. As the energy landscape shifts in the North-East of Scotland, the impacts will be felt most keenly in communities from shifts in employment to changes to local supply chains. It is important to note that Net Zero ambitions will also change the nature and structure of communities in the region, for those within a shifting oil and gas industry and those without. A just transition ensures that all voices are heard, engaged and included in the process of change, and that communities, including those who have benefited and those who have not, have a stake in determining the direction of travel of a changing society and economy of the North-east. As a result, there is a need for a community-oriented perspective to transition which discusses a range of values and perspectives, the opportunities and resources available for transition and how communities of place can support the process of change toward Net Zero. Social transformation is a key element of a just transition and community engagement, inclusion and participation is embedded in the principles laid down by the Just Transition Commission. Despite this high-level recognition of social justice and inclusion at the heart of transition, there has been little move to understand what a just transition means in the context of local communities in the NorthEast. This project aims to address this imbalance and promote the ability of communities to not only engage but to help steer net zero transitions. It seeks to uncover and build a stronger local consensus about the vision and pathways for civil society to progress a just transition in the Northeast of Scotland. The project aims to do this through bringing together civil society, academic, policy and business stakeholders across three interactive workshops to: 1. Empower NE communities to engage with the Just Transition agenda 2. Identify what are the key issues within a Just Transition and how they can be applied in the Northeast. 3. Directly support communities by providing training and resources to facilitate change by working in partnership. The project funding supported the delivery of three professionally facilitated online workshops that were held over 2021/22 (Figure 1). Workshop 1 explored the global principles within a just transition and how these could apply to the Scottish context. Workshop 2 examined different pathways and options for transition in the context of Northeast Scotland. Workshop 3, in partnership with NESCAN explored operational challenges and best practices with community participants. The outcomes from the three workshops are explored in detail.

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Allen, Kathy, Andy Nadeau e Andy Robertston. Natural resource condition assessment: Salinas Pueblo Missions National Monument. National Park Service, maggio 2022. http://dx.doi.org/10.36967/nrr-2293613.

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The Natural Resource Condition Assessment (NRCA) Program aims to provide documentation about the current conditions of important park natural resources through a spatially explicit, multi-disciplinary synthesis of existing scientific data and knowledge. Findings from the NRCA will help Salinas Pueblo Missions National Monument (SAPU) managers to develop near-term management priorities, engage in watershed or landscape scale partnership and education efforts, conduct park planning, and report program performance (e.g., Department of the Interior’s Strategic Plan “land health” goals, Government Performance and Results Act). The objectives of this assessment are to evaluate and report on current conditions of key park resources, to evaluate critical data and knowledge gaps, and to highlight selected existing stressors and emerging threats to resources or processes. For the purpose of this NRCA, staff from the National Park Service (NPS) and Saint Mary’s University of Minnesota – GeoSpatial Services (SMUMN GSS) identified key resources, referred to as “components” in the project. The selected components include natural resources and processes that are currently of the greatest concern to park management at SAPU. The final project framework contains nine resource components, each featuring discussions of measures, stressors, and reference conditions. This study involved reviewing existing literature and, where appropriate, analyzing data for each natural resource component in the framework to provide summaries of current condition and trends in selected resources. When possible, existing data for the established measures of each component were analyzed and compared to designated reference conditions. A weighted scoring system was applied to calculate the current condition of each component. Weighted Condition Scores, ranging from zero to one, were divided into three categories of condition: low concern, moderate concern, and significant concern. These scores help to determine the current overall condition of each resource. The discussions for each component, found in Chapter 4 of this report, represent a comprehensive summary of current available data and information for these resources, including unpublished park information and perspectives of park resource managers, and present a current condition designation when appropriate. Each component assessment was reviewed by SAPU resource managers, NPS Southern Colorado Plateau Network (SCPN) staff, or outside experts. Existing literature, short- and long-term datasets, and input from NPS and other outside agency scientists support condition designations for components in this assessment. However, in some cases, data were unavailable or insufficient for several of the measures of the featured components. In other instances, data establishing reference condition were limited or unavailable for components, making comparisons with current information inappropriate or invalid. In these cases, it was not possible to assign condition for the components. Current condition was not able to be determined for six of the ten components due to these data gaps. For those components with sufficient available data, the overall condition varied. Two components were determined to be in good condition: dark night skies and paleontological resources. However, both were at the edge of the good condition range, and any small decline in conditions could shift them into the moderate concern range. Of the components in good condition, a trend could not be assigned for paleontological resources and dark night skies is considered stable. Two components (wetland and riparian communities and viewshed) were of moderate concern, with no trend assigned for wetland and riparian communities and a stable trend for viewshed. Detailed discussion of these designations is presented in Chapters 4 and 5 of this report. Several park-wide threats and stressors influence the condition of priority resources in SAPU...