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Статті в журналах з теми "Drive and dissipation":
1
Ikeda, Tatsuhiko N., and Masahiro Sato. "General description for nonequilibrium steady states in periodically driven dissipative quantum systems." Science Advances 6, no. 27 (July 2020): eabb4019. http://dx.doi.org/10.1126/sciadv.abb4019.
Анотація:
Laser technology has developed and accelerated photo-induced nonequilibrium physics, from both the scientific and engineering viewpoints. Floquet engineering, i.e., controlling material properties and functionalities by time-periodic drives, is at the forefront of quantum physics of light-matter interaction. However, it is limited to ideal dissipationless systems. Extending Floquet engineering to various materials requires understanding of the quantum states emerging in a balance of the periodic drive and energy dissipation. Here, we derive a general description for nonequilibrium steady states (NESSs) in periodically driven dissipative systems by focusing on systems under high-frequency drive and time-independent Lindblad-type dissipation. Our formula correctly describes the time average, fluctuation, and symmetry properties of the NESS, and can be computed efficiently in numerical calculations. This approach will play fundamental roles in Floquet engineering in a broad class of dissipative quantum systems from atoms and molecules to mesoscopic systems, and condensed matter.
2
Kumar, Naveen, Suram Singh, and Avinash Chand Yadav. "Energy fluctuations in one dimensional Zhang sandpile model." Journal of Statistical Mechanics: Theory and Experiment 2022, no. 7 (July 1, 2022): 073203. http://dx.doi.org/10.1088/1742-5468/ac7aa8.
Анотація:
Abstract We consider the Zhang sandpile model in one-dimension (1D) with locally conservative (or dissipative) dynamics and examine its total energy fluctuations at the external drive time scale. The bulk-driven system leads to Lorentzian spectra, with a cutoff time T growing linearly with the system size L. The fluctuations show 1/f α behavior with α ∼ 1 for the boundary drive, and the cutoff time varies non-linearly. For conservative local dynamics, the cutoff time shows a power-law growth T ∼ L λ that differs from an exponential form ∼exp(μL) observed for the nonconservative case. We suggest that the local dissipation is not a necessary ingredient of the system in 1D to get the 1/f noise, and the cutoff time can reveal the distinct nature of the local dynamics. We also discuss the energy fluctuations for locally nonconservative dynamics with random dissipation.
3
Palochkin, S. V., and P. N. Rudovskiy. "Energy Dissipation in a Drive Chain During Its Transverse Vibrations as a String with Fixed Ends." Proceedings of Higher Educational Institutions. Маchine Building, no. 06 (723) (June 2020): 3–9. http://dx.doi.org/10.18698/0536-1044-2020-6-3-9.
Анотація:
Chain transmissions are widespread in drives of machines used for various industrial purposes. In order to study drive dynamics, it is important to know the dissipative characteristics of its components and gears. However, the information on the damping ability of chain transmissions in research and technical literature is limited and fragmented, which makes the topic of this work, dedicated to the study of energy dissipation in transverse vibrations of chain transmission branches, of great current interest. The objective of this work was to study and determine the quantitative characteristics of energy dissipation in a drive chain experiencing the most common form of transverse vibrations as a string with fixed ends, which is characteristic of transmissions with large masses of sprockets and parts attached to them. To achieve this objective, a mathematical model of the dissipation of vibrational energy was developed using a method of estimating energy losses due to friction when parts of the chain’s hinge joint slip in a compressed contact. Engineering formulas for calculating energy dissipation per cycle of vibrations and absorption coefficient were obtained. The adequacy of the developed model and the obtained calculation formulas was confirmed by the results of the experimental determination of the absorption coefficients of the chain using the method of free damped vibrations. The results of the study allow us to conclude that chain transmissions have an increased damping capacity, and to determine the influence of transmission parameters and the oscillatory process on it.
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Chyba, Christopher F., and Kevin P. Hand. "Internal-current Lorentz-force Heating of Astrophysical Objects." Astrophysical Journal Letters 922, no. 2 (December 1, 2021): L38. http://dx.doi.org/10.3847/2041-8213/ac399d.
Анотація:
Abstract Two forms of ohmic heating of astrophysical secondaries have received particular attention: unipolar-generator heating with currents running between the primary and secondary, and magnetic induction heating due to the primary’s time-varying field. Neither appears to cause significant dissipation in the contemporary solar system. But these discussions have overlooked heating derived from the spatial variation of the primary’s field across the interior of the secondary. This leads to Lorentz-force-driven currents around paths entirely internal to the secondary, with resulting ohmic heating. We examine three ways to drive such currents, by the cross product of (1) the secondary’s azimuthal orbital velocity with the nonaxially symmetric field of the primary, (2) the radial velocity (due to nonzero eccentricity) of the secondary with the primary’s field, or (3) the out-of-plane velocity (due to nonzero inclination) with the primary’s field. The first of these operates even for a spin-locked secondary whose orbit has zero eccentricity, in strong contrast to tidal dissipation. We show that Jupiter’s moon Io today could dissipate about 600 GW (more than likely current radiogenic heating) in the outer 100 m of its metallic core by this mechanism. Had Io ever been at 3 Jovian radii instead of its current 5.9, it could have been dissipating 15,000 GW. Ohmic dissipation provides a mechanism that could operate in any solar system to drive inward migration of secondaries that then necessarily comes to a halt upon reaching a sufficiently close distance to the primary.
5
Gadomski, Adam. "Soft-Material Dissipative Formation by a Kramers-Type Picture." Research Letters in Materials Science 2007 (2007): 1–4. http://dx.doi.org/10.1155/2007/71642.
Анотація:
We consider a model soft-material formation in dimensiond(a degree of freedom) undergoing an entropic drive, deeply rooted in first law of thermodynamics as well as in entropy production, namely, dissipation rate. It turns out that for such entropy-driven (dissipative) process, two strategies of making the formation orderly can be seen. In low-temperature limit, one may promote curvature-controlled, surface-tension involving scenario, usually characteristic of polycrystals and bubbles. In high-temperature limit, there can be a chance for creating order by establishing viscoelastic phase separation, promoting some microstress field's microrheological action that somehow renormalizes the system toward ordering. The latter, in turn, is very characteristic of protein and/or colloid network formations. This altogether implies that a disordering thermodynamic factor, such as the entropy can typically be, is able to effectively promote ordering by respective energy dissipation, in particular for soft-matter rearrangements and clusterings with weak interactions among the basic material's units, namely, “soft” grains.
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GUPTA, ROHINI, JOHN WILLIS, and LAWRENCE T. PILEGGI. "LOW POWER DESIGN OF OFF-CHIP DRIVERS AND TRANSMISSION LINES: A BRANCH AND BOUND APPROACH." International Journal of High Speed Electronics and Systems 07, no. 02 (June 1996): 249–67. http://dx.doi.org/10.1142/s0129156496000104.
Анотація:
As electronic systems grow in functional complexity, hence size, the design is often forced into a multi-chip solution. For such systems, the power dissipation due to the off-chip drivers (OCDs) and the off-chip interconnect capacitance can contribute to a significant portion of the overall system power. Often, however, this excessive power dissipation is unwarranted, since a smaller OCD can be used to drive the transmission line load, hence reducing the net capacitance being switched. The objective of this paper is to enable power dissipation trade-off decisions during the high-level phases of design and to minimize the power dissipation of OCDs and their associated interconnect. First, a termination metric is described that uses width optimization of RLC interconnects. Then, in terms of a proposed linear driver model, the low power design objective is posed as an integer programming problem and a branch and bound enumeration algorithm is presented. The driver and interconnect sizes are determined which will preserve signal quality, dispense with additional termination components, meet delay requirements, and minimize the overall power dissipation.
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Chaudhari, Abhijit P., Shane P. Kelly, Riccardo J. Valencia-Tortora, and Jamir Marino. "Zeno crossovers in the entanglement speed of spin chains with noisy impurities." Journal of Statistical Mechanics: Theory and Experiment 2022, no. 10 (October 1, 2022): 103101. http://dx.doi.org/10.1088/1742-5468/ac8e5d.
Анотація:
Abstract We use a noisy signal with finite correlation time to drive a spin (dissipative impurity) in the quantum XY spin chain and calculate the dynamics of entanglement entropy (EE) of a bipartition of spins, for a stochastic quantum trajectory. We compute the noise averaged EE of a bipartition of spins and observe that its speed of spreading decreases at strong dissipation, as a result of the Zeno effect. We recover the Zeno crossover and show that noise averaged EE can be used as a proxy for the heating and Zeno regimes. Upon increasing the correlation time of the noise, the location of the Zeno crossover shifts at stronger dissipation, extending the heating regime.
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Teixeira, W. S., F. L. Semião, J. Tuorila, and M. Möttönen. "Assessment of weak-coupling approximations on a driven two-level system under dissipation." New Journal of Physics 24, no. 1 (December 31, 2021): 013005. http://dx.doi.org/10.1088/1367-2630/ac43ee.
Анотація:
Abstract The standard weak-coupling approximations associated to open quantum systems have been extensively used in the description of a two-level quantum system, qubit, subjected to relatively weak dissipation compared with the qubit frequency. However, recent progress in the experimental implementations of controlled quantum systems with increased levels of on-demand engineered dissipation has motivated precision studies in parameter regimes that question the validity of the approximations, especially in the presence of time-dependent drive fields. In this paper, we address the precision of weak-coupling approximations by studying a driven qubit through the numerically exact and non-perturbative method known as the stochastic Liouville–von Neumann equation with dissipation. By considering weak drive fields and a cold Ohmic environment with a high cutoff frequency, we use the Markovian Lindblad master equation as a point of comparison for the SLED method and study the influence of the bath-induced energy shift on the qubit dynamics. We also propose a metric that may be used in experiments to map the regime of validity of the Lindblad equation in predicting the steady state of the driven qubit. In addition, we study signatures of the well-known Mollow triplet and observe its meltdown owing to dissipation in an experimentally feasible parameter regime of circuit electrodynamics. Besides shedding light on the practical limitations of the Lindblad equation, we expect our results to inspire future experimental research on engineered open quantum systems, the accurate modeling of which may benefit from non-perturbative methods.
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Wang, Yong Cong, You Kun Zhang, and Yan Hui Lu. "Heat Analysis of Vehicle Drive Axle." Applied Mechanics and Materials 851 (August 2016): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amm.851.299.
Анотація:
The vehicle drive axle is one of the main sources of power loss in drivetrain system, and its improvements can have a significant impact on vehicle fuel economy. Gears churning loss, bearing friction loss and engaging friction loss all make a great contribution to the heat generation. The temperatures of lubricants, the gear tooth contacting surfaces, and the bearing surfaces are critical to the overall axle performance in terms of power losses, fatigue life, and wear. So it is important to understand the heat generation and dissipation in automotive drive axle. However, the quantities of understandings of drive axle temperature is limited and published information is deficient.In this paper, we establish the mathematical model of heat generation and dissipation to investigate the connection between thermal behavior and power loss. Power loss is consist of churning loss, bearing friction loss and engaging friction loss. And also we simulate the model to get the conclusion and then conduct the experiments to verify the correctness of the theories and models.
10
Palochkin, S. V., M. A. Karnaukhov, M. A. Lyubchenko, and P. N. Rudovskiy. "Energy dissipation in the variable stiffness couplings with a serpentine spring at the torsional vibrations." Proceedings of Higher Educational Institutions. Маchine Building, no. 6 (759) (June 2023): 3–11. http://dx.doi.org/10.18698/0536-1044-2023-6-3-11.
Анотація:
The paper presents results of the theoretical research of the structural vibration damping in the variable stiffness couplings with a serpentine spring, which are rather widely used in the drives of the heavy engineering and machine tool products exposed to the vibration loads. When performing dynamic calculations of the drives of such machines, it is necessary to know the dissipative characteristics of their components and parts, including the indicated couplings. The paper considers the case of torsional harmonic vibrations characteristic for the coupling drive with a serpentine spring associated with twisting of the shafts connected by this coupling due to the attached parts imbalance. Quantitative characteristics of the torsional vibration energy dissipation in the couplings under consideration were studied and determined using the well-known method for estimating the vibration energy losses due to friction during slipping in the compressed parts’ contact. Mathematical model of the torsional vibration damping in a coupling was developed, which makes it possible to determine its quantitative characteristics in the form of vibration energy dissipation per cycle and the absorption coefficient depending on the coupling design parameters and the vibration process. The proposed model is implemented as an interactive application program in the MATLAB computer environment.
Дисертації з теми "Drive and dissipation":
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Real, Elgueda Bastián Maximiliano. "Transport and driven-dissipative localization in exciton-polariton lattices." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR025.
Анотація:
La simulation des Hamiltoniens de réseaux dans les plateformes photoniques a permis de mieux comprendre les nouvelles propriétés de transport et de localisation dans le contexte de la physique de l'état solide. En particulier, les exciton-polaritons constituent un système polyvalent permettant d'étudier ces propriétés dans des réseaux avec des structures de bande intrigantes en présence de pertes et de gains, et d'interactions entre particules. Les polaritons sont des quasi-particules hybrides lumière-matière résultant du couplage fort entre les photons et les excitons dans les microcavités semi-conductrices, dont les propriétés peuvent être directement accessibles dans les expériences de photoluminescence. Dans cette thèse, nous étudions premièrement les caractéristiques des réseaux en nid d'abeille déformés, composés de résonateurs de polaritons couplés, à haut contenu photonique. Dans un réseau déformé de façon critique, nous mettons en évidence à la fois un transport semi-Dirac et une localisation anisotrope des photons. Deuxièmement, nous montrons qu'un forçage judicieux dans des réseaux de résonateurs à pertes permet l'apparition de nouveaux modes localisés. En utilisant des réseaux de polaritons sous un forçage résonant par plusieurs faisceaux optiques, nous démontrons la possibilité de localiser la lumière sur différentes géométries, voir jusqu'à un seul site. Enfin, nous profitons de l'interaction de polaritons dépendant de la polarisation pour démontrer un effet optique de type Zeeman dans un seul micropilier. En combinant le couplage spin-orbite optique, inhérent aux microstructures semi-conductrices, avec l'effet Zeeman, induit par l'interaction, nous montrons l'émission de faisceaux de vortex avec une chiralité bien définie. Cette thèse met en lumière la puissance des plateformes de polaritons pour étudier les Hamiltoniens de réseaux avec des propriétés sans précédent. Elle apporte également un premier pas vers la génération, entièrement optique, de phases topologiques dans les réseauxThe simulation of lattice Hamiltonians in photonic platforms has been enlightening in the understanding of novel transport and localization properties in the context of solid-state physics. In particular, exciton-polaritons provide a versatile system to investigate these properties in lattices with intriguing band structures in the presence of gain and loss, and particle interactions. Polaritons are hybrid light-matter quasiparticles arising from the strong coupling between photons and excitons in semiconductor microcavities, whose properties can be directly accessed in photoluminescence experiments. In this thesis, we firstly study the features of strained honeycomb lattices made of coupled polariton resonators having high photonic content. In a critically strained lattice, we evidence both a semi-Dirac transport and an anisotropic localization of photons. Secondly, we show that a judicious driving in lattices of lossy resonators allows the appearance of novel localized modes. Using polariton lattices driven resonantly with several optical beams, we demonstrate the localization of light in at-will geometries down to a single site. Finally, we take advantage of the polarization-dependent polariton interaction to demonstrate an optical Zeeman-like effect in a single micropillar. In combination with optical spin-orbit coupling inherent to semiconductor microstructures, the interaction-induced Zeeman effect results in emission of vortex beams with a well-defined chirality. This thesis brings to light the power of polariton platforms to study lattice Hamiltonians with unprecedented properties and it also provides a first step towards the fully-optical generation of topological phases in lattices
2
Scarlatella, Orazio. "Driven-Dissipative Quantum Many-Body Systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS281/document.
Анотація:
Ma thèse de doctorat était consacrée à l'étude des systèmes quantiques à plusieurs corps dissipatifs et pilotés. Ces systèmes représentent des plateformes naturelles pour explorer des questions fondamentales sur la matière dans des conditions de non-équilibre, tout en ayant un impact potentiel sur les technologies quantiques émergentes. Dans cette thèse, nous discutons d'une décomposition spectrale de fonctions de Green de systèmes ouverts markoviens, que nous appliquons à un modèle d'oscillateur quantique de van der Pol. Nous soulignons qu’une propriété de signe des fonctions spectrales des systèmes d’équilibre ne s’imposait pas dans le cas de systèmes ouverts, ce qui produisait une surprenante "densité d’états négative", avec des conséquences physiques directes. Nous étudions ensuite la transition de phase entre une phase normale et une phase superfluide dans un système prototype de bosons dissipatifs forcés sur un réseau. Cette transition est caractérisée par une criticité à fréquence finie correspondant à la rupture spontanée de l'invariance par translation dans le temps, qui n’a pas d’analogue dans des systèmes à l’équilibre. Nous discutons le diagramme de phase en champ moyen d'une phase isolante de Mott stabilisée par dissipation, potentiellement pertinente pour des expériences en cours. Nos résultats suggèrent qu'il existe un compromis entre la fidélité de la phase stationnaire à un isolant de Mott et la robustesse d'une telle phase à taux de saut fini. Enfin, nous présentons des développements concernant la théorie du champ moyen dynamique (DMFT) pour l’étude des systèmes à plusieurs corps dissipatifs et forcés. Nous introduisons DMFT dans le contexte des modèles dissipatifs et forcés et nous développons une méthode pour résoudre le problème auxiliaire d'une impureté couplée simultanément à un environnement markovien et à un environnement non-markovien. À titre de test, nous appliquons cette nouvelle méthode à un modèle simple d’impureté fermioniqueMy PhD was devoted to the study of driven-dissipative quantum many-body systems. These systems represent natural platforms to explore fundamental questions about matter under non-equilibrium conditions, having at the same time a potential impact on emerging quantum technologies. In this thesis, we discuss a spectral decomposition of single-particle Green functions of Markovian open systems, that we applied to a model of a quantum van der Pol oscillator. We point out that a sign property of spectral functions of equilibrium systems doesn't hold in the case of open systems, resulting in a surprising ``negative density of states", with direct physical consequences. We study the phase transition between a normal and a superfluid phase in a prototype system of driven-dissipative bosons on a lattice. This transition is characterized by a finite-frequency criticality corresponding to the spontaneous break of time-translational invariance, which has no analog in equilibrium systems. Later, we discuss the mean-field phase diagram of a Mott insulating phase stabilized by dissipation, which is potentially relevant for ongoing experiments. Our results suggest that there is a trade off between the fidelity of the stationary phase to a Mott insulator and robustness of such a phase at finite hopping. Finally, we present some developments towards using dynamical mean field theory (DMFT) for studying driven-dissipative lattice systems. We introduce DMFT in the context of driven-dissipative models and developed a method to solve the auxiliary problem of a single impurity, coupled simultaneously to a Markovian and a non-Markovian environment. As a test, we applied this novel method to a simple model of a fermionic, single-mode impurity
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Kohler, Sigmund. "The interplay of chaos and dissipation in driven quantum systems." [S.l.] : [s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=981056199.
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Siemer, Bernd, Viktor Holubec, Petr Chvosta, and Philipp Maass. "Fluctuation dissipation theorem and Onsager coefficients in driven diffusion systems." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198659.
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Capela, Matheus. "Kolmogorov-Sinai entropy and dissipation in driven classical hamiltonian systems." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8216.
Анотація:
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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
Diversas relações entre física e teoria de informação foram estabelecidas desde o trabalho de Shannon. Entropia é um elemento essencial nesta conexão, quantificando a informação transferida em um experimento. Mecânica estatística está conectada à teoria de informação através do princípio de máxima entropia, definindo as distribuições de probabilidade de estados de equilíbrio como aquelas que maximizam a entropia sujeita as condições físicas apropriadas. A energia dissipada em um processo clássico está conectada a divergência de Kullback-Leibler. Recentemente, Still e colaboradores mostraram que a ineficiência energética em um processo estocástico Markoviano é equivalente a ineficiência do modelo, definida como a diferença em informação que o estado do sistema compartilha com as variáveis externas no futuro e passado. Isto sugere que imprevisibilidade e ineficiência energética estejam relacionadas no âmbito da física clássica. O objetivo deste trabalho é estabelecer uma relação entre o comportamento randômico de sistemas clássicos, quantificado pela entropia de Kolmogorov-Sinai, com a ineficiência energética.
Many connections between physics and information theory have been revealed since the development of classical information theory by Shannon. A key concept in this connection is entropy, which represents the amount of information transferred to the observer who performs measurements in an experiment. Statistical mechanics is a physical theory deeply connected to information by Jaynes’ Maximum Entropy principle, which defines equilibrium probability distributions as the ones that maximizes entropy under some physical constraints. In this way, these distributions are the less unbiased probabilities that can be assignment to an event. Following this path, the dissipated energy in a classical Hamiltonian process (also known as the thermodynamic entropy production) was connected to the relative entropy between the forward and backward probability densities. A recent work by Still et al. has revealed that energetic inefficiency and model inefficiency are equivalent concepts in Markovian processes, where the latter is defined as the difference in mutual information that the system’s state shares with the future and past environmental variables. This raises the question whether model unpredictability and energetic inefficiency are connected in the framework of classical physics. The aim of this study is to connect the concepts of random behavior of a classical Hamiltonian system with its energetic inefficiency. The random behavior of a classical system is quantified by the Kolmogorov-Sinai entropy associated with its dynamics, an information-theoretic approach to chaos, whereas energetic inefficiency is measured by the dissipated work.
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Siemer, Bernd, Viktor Holubec, Petr Chvosta, and Philipp Maass. "Fluctuation dissipation theorem and Onsager coefficients in driven diffusion systems." Diffusion fundamentals 24 (2015) 47, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14567.
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Dröse, Thorsten. "Metastability and depinning in inhomogeneous driven dissipative systems." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963296493.
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Vorberg, Daniel. "Generalized Bose-Einstein Condensation in Driven-dissipative Quantum Gases." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234044.
Анотація:
Bose-Einstein condensation is a collective quantum phenomenon where a macroscopic number of bosons occupies the lowest quantum state. For fixed temperature, bosons condense above a critical particle density. This phenomenon is a consequence of the Bose-Einstein distribution which dictates that excited states can host only a finite number of particles so that all remaining particles must form a condensate in the ground state. This reasoning applies to thermal equilibrium. We investigate the fate of Bose condensation in nonisolated systems of noninteracting Bose gases driven far away from equilibrium. An example of such a driven-dissipative scenario is a Floquet system coupled to a heat bath. In these time-periodically driven systems, the particles are distributed among the Floquet states, which are the solutions of the Schrödinger equation that are time periodic up to a phase factor. The absence of the definition of a ground state in Floquet systems raises the question, whether Bose condensation survives far from equilibrium. We show that Bose condensation generalizes to an unambiguous selection of multiple states each acquiring a large occupation proportional to the total particle number. In contrast, the occupation numbers of nonselected states are bounded from above. We observe this phenomenon not only in various Floquet systems, i.a. time-periodically-driven quartic oscillators and tight-binding chains, but also in systems coupled to two baths where the population of one bath is inverted. In many cases, the occupation numbers of the selected states are macroscopic such that a fragmented condensation is formed according to the Penrose-Onsager criterion. We propose to control the heat conductivity through a chain by switching between a single and several selected states. Furthermore, the number of selected states is always odd except for fine-tuning. We provide a criterion, whether a single state (e.g., Bose condensation) or several states are selected. In open systems, which exchange also particles with their environment, the nonequilibrium steady state is determined by the interplay between the particle-number-conserving intermode kinetics and particle-number-changing pumping and loss processes. For a large class of model systems, we find the following generic sequence when increasing the pumping: For small pumping, no state is selected. The first threshold, where the stimulated emission from the gain medium exceeds the loss in a state, is equivalent to the classical lasing threshold. Due to the competition between gain, loss and intermode kinetics, further transitions may occur. At each transition, a single state becomes either selected or deselected. Counterintuitively, at sufficiently strong pumping, the set of selected states is independent of the details of the gain and loss. Instead, it is solely determined by the intermode kinetics like in closed systems. This implies equilibrium condensation when the intermode kinetics is caused by a thermal environment. These findings agree well with observations of exciton-polariton gases in microcavities. In a collaboration with experimentalists, we observe and explain the pump-power-driven mode switching in a bimodal quantum-dot micropillar cavityDie Bose-Einstein-Kondensation ist ein Quantenphänomen, bei dem eine makroskopische Zahl von Bosonen den tiefsten Quantenzustand besetzt. Die Teilchen kondensieren, wenn bei konstanter Temperatur die Teilchendichte einen kritischen Wert übersteigt. Da die Besetzungen von angeregten Zuständen nach der Bose-Einstein-Statistik begrenzt sind, bilden alle verbleibenden Teilchen ein Kondensat im Grundzustand. Diese Argumentation ist im thermischen Gleichgewicht gültig. In dieser Arbeit untersuchen wir, ob die Bose-Einstein-Kondensation in nicht wechselwirkenden Gasen fern des Gleichgewichtes überlebt. Diese Frage stellt sich beispielsweise in Floquet-Systemen, welche Energie mit einer thermischen Umgebung austauschen. In diesen zeitperiodisch getriebenen Systemen verteilen sich die Teilchen auf Floquet-Zustände, die bis auf einen Phasenfaktor zeitperiodischen Lösungen der Schrödinger-Gleichung. Die fehlende Definition eines Grundzustandes wirft die Frage nach der Existenz eines Bose-Kondensates auf. Wir finden eine Generalisierung der Bose-Kondensation in Form einer Selektion mehrerer Zustände. Die Besetzung in jedem selektierten Zustand ist proportional zur Gesamtteilchenzahl, während die Besetzung aller übrigen Zustände begrenzt bleibt. Wir beobachten diesen Effekt nicht nur in Floquet-Systemen, z.B. getriebenen quartischen Fallen, sondern auch in Systemen die an zwei Wärmebäder gekoppelt sind, wobei die Besetzung des einen invertiert ist. In vielen Fällen ist die Teilchenzahl in den selektierten Zuständen makroskopisch, sodass nach dem Penrose-Onsager Kriterium ein fragmentiertes Kondensat vorliegt. Die Wärmeleitfähigkeit des Systems kann durch den Wechsel zwischen einem und mehreren selektierten Zuständen kontrolliert werden. Die Anzahl der selektierten Zustände ist stets ungerade, außer im Falle von Feintuning. Wir beschreiben ein Kriterium, welches bestimmt, ob es nur einen selektierten Zustand (z.B. Bose-Kondensation) oder viele selektierte Zustände gibt. In offenen Systemen, die auch Teilchen mit der Umgebung austauschen, ist der stationäre Nichtgleichgewichtszustand durch ein Wechselspiel zwischen der (Teilchenzahl-erhaltenden) Intermodenkinetik und den (Teilchenzahl-ändernden) Pump- und Verlustprozessen bestimmt. Für eine Vielzahl an Modellsystemen zeigen wir folgendes typisches Verhalten mit steigender Pumpleistung: Zunächst ist kein Zustand selektiert. Die erste Schwelle tritt auf, wenn der Gewinn den Verlust in einer Mode ausgleicht und entspricht der klassischen Laserschwelle. Bei stärkerem Pumpen treten weitere Übergänge auf, an denen je ein einzelner Zustand entweder selektiert oder deselektiert wird. Schließlich ist die Selektion überraschenderweise unabhängig von der Charakteristik des Pumpens und der Verlustprozesse. Die Selektion ist vielmehr ausschließlich durch die Intermodenkinetik bestimmt und entspricht damit den oben beschriebenen geschlossenen Systemen. Ist die Kinetik durch ein thermisches Bad hervorgerufen, tritt wie im Gleichgewicht eine Grundzustands-Kondensation auf. Unsere Theorie ist in Übereinstimmung mit experimentellen Beobachtungen von Exziton-Polariton-Gasen in Mikrokavitäten. In einer Kooperation mit experimentellen Gruppen konnten wir den Modenwechsel in einem bimodalen Quantenpunkt-Mikrolaser erklären
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Van, Schalkwyk Daniel Jacobus. "Dynamics and Energy Management of Electric Vehicles." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/725.
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Elliott, Matthew. "Theory of nonclassical photonic states in driven-dissipative circuit quantum electrodynamics." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/841210/.
Анотація:
Superconducting circuits provide an architecture upon which cavity quantum electrodynamics (QED) can be implemented at microwave frequencies in a highly tunable environment. Known as circuit QED, these systems can achieve larger nonlinearities, stronger coupling and greater controllability than can be achieved in cavity QED, all in a customisable, solid state device, making this technology an exciting test bed for both quantum optics and quantum information processing. These new parameter regimes open up new avenues for quantum technology, while also allowing older quantum optics results to finally be tested. In particular is is now possible to experimentally produce nonclassical states, such as squeezed and Schr\"odinger cat states, relatively simply in these devices. Using open quantum systems methods, in this thesis we investigate four problems which involve the use of nonclassical states in circuit QED. First we investigate the effects of a Kerr nonlinearity on the ability to preserve transported squeezed states in a superconducting cavity, and whether this setup permits us to generate, and perform tomography, of a highly squeezed field using a qubit, with possible applications in the characterisation of sources of squeezed microwaves. Second, we present a novel scheme for the amplification of cat states using a coupled qubit and external microwave drives, inspired by the stimulated Raman adiabatic passage. This scheme differs from similar techniques in circuit QED in that it is deterministic and therefore compatible with a protocol for stabilising cat states without the need for complex dissipation engineering. Next we use solutions of Fokker-Planck equations to study the exact steady-state response of two nonlinear systems: a transmon qubit coupled to a readout resonator, where we find good agreement with experiments and see simultaneous bistability of the cavity and transmon; and a parametrically driven nonlinear resonator, where we compare the classical and quantum phases of the system and discuss applications in the generation of squeezed states and stabilisation of cat states. Finally, we investigate the use of two different types of superconducting qubits in a single experiment, seeing that this enables engineering of the self- and cross-Kerr effects in a line of cavities. This could provide a valuable means of entangling cavity states, in addition to a resource for quantum simulation.
Книги з теми "Drive and dissipation":
1
Räty, Raimo. Studies on nonlinear dynamics of driven vibrating systems with dissipation. Helsinki: Finnish Academy of Technology, 1992.
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Kavokin, Alexey V., Jeremy J. Baumberg, Guillaume Malpuech, and Fabrice P. Laussy. Strong Coupling: Polariton Bose Condensation. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198782995.003.0008.
Анотація:
In this Chapter we address the physics of Bose-Einstein condensation and its implications to a driven-dissipative system such as the polariton laser. We discuss the dynamics of exciton-polaritons non-resonantly pumped within a microcavity in the strong coupling regime. It is shown how the stimulated scattering of exciton-polaritons leads to formation of bosonic condensates that may be stable at elevated temperatures, including room temperature.
Частини книг з теми "Drive and dissipation":
1
Cohen, D. "Driven Chaotic Mesoscopic Systems, Dissipation and Decoherence." In Dynamics of Dissipation, 317–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-46122-1_14.
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Jarzynski, C. "What Is the Microscopic Response of a System Driven Far From Equilibrium?" In Dynamics of Dissipation, 63–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-46122-1_4.
3
Garrett, Steven L. "Dissipative Hydrodynamics." In Understanding Acoustics, 421–52. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_9.
Анотація:
Abstract In the previous chapter, the resonance frequency, ωo, of a Helmholtz resonator was calculated. When driven at that frequency, the predicted pressure amplitude inside the resonator’s volume (compliance) became infinite. This was because the theory used to model that inertance and compliance network in Figs. 10.1007/978-3-030-44787-8_8#Fig11 and 10.1007/978-3-030-44787-8_8#Fig15, and in Eq. (10.1007/978-3-030-44787-8_8#Equ50), did not include any dissipation. By introducing DeltaEC, we were able to calculate the amount of power dissipated in the neck (inertance) and volume (compliance) of a 500 ml boiling flask. In this chapter, those losses will be calculated from hydrodynamic “first principles.”
4
Large, Steven J. "Optimal Discrete Control: Minimizing Dissipation in Discretely Driven Systems." In Springer Theses, 113–34. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-030-85825-4_7.
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Kirakosyan, A. S. "Dissipative Soliton Dynamics in Strongly Driven Ferromagnets." In Nonlinearity and Disorder: Theory and Applications, 415–22. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0542-5_35.
6
Fujisawa, Naoki, Christopher D. Bertram, Klaus Schindhelm, Manoja Ranawake, and Mitsuo Umezu. "Energy Dissipation of Diaphragms for a Pneumatically Driven Artificial Heart." In Heart Replacement, 259–64. Tokyo: Springer Japan, 1996. http://dx.doi.org/10.1007/978-4-431-67020-9_35.
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Ko, Kwangman. "ADL-Driven Simulator Generation for Energy Dissipation Tracing and Monitoring." In Lecture Notes in Electrical Engineering, 459–66. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4516-2_46.
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Roy, Kaushik, and Sharat Prasad. "Power dissipation driven FPGA place and route under delay constraints." In Field-Programmable Logic Architectures, Synthesis and Applications, 57–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-58419-6_69.
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Yamaguchi, Makoto, and Tetsuo Ogawa. "Equilibrium to Nonequilibrium Condensation in Driven-Dissipative Semiconductor Systems." In Principles and Methods of Quantum Information Technologies, 341–61. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55756-2_16.
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Babin, Sergey A., Evgeniy V. Podivilov, Denis S. Kharenko, Anastasia E. Bednyakova, Mikhail P. Fedoruk, Olga V. Shtyrina, Vladimir L. Kalashnikov, and Alexander A. Apolonski. "SRS-Driven Evolution of Dissipative Solitons in Fiber Lasers." In Nonlinear Optical Cavity Dynamics, 277–316. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527686476.ch12.
Тези доповідей конференцій з теми "Drive and dissipation":
1
Wu, Yingdan, Michael J. Leamy, and Michael Varenberg. "Belt-Drive Mechanics: Energy Losses in the Presence of Detachment Waves." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97643.
Анотація:
Abstract The dissipative rolling friction moment in a simple belt-drive system is estimated both experimentally and computationally while taking into account the detachment events at the belt-pulley interface. Shear traction is estimated based on measurements of the shear strain along the contact arc. It is shown that the dissipative moment can be approximated by taking the difference between the shear traction and the load carried by the belt. A model is developed for analyzing the contributions of different components to this dissipative moment by considering both the volumetric and surface hysteresis losses. The computed rolling friction moment is found to be in good agreement with that estimated based on the experiments. It is also found that while the shear- and stretching-induced energy losses contribute the most to the dissipation in the belt drive system, the losses associated with the Schallamach waves of detachment make up a considerable portion of the dissipation in the driver case.
2
Miyoshi, Masahiro, Tetsuharu Kawasaki, Satoru Takahashi, and Hironori Mine. "90mm Magneto-Optical Disk Drive With Digital Servo." In Optical Data Storage. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ods.1991.me1.
Анотація:
As personal computers and OA machines with higer level functions continue decrease in size recently, the requirements for external storage devices are becoming exacting. The 130mm magneto-optical disk drives presently used cannot necessarily meet those requirements. We have developed a 90mm magneto-optical disk drive, aiming at higher performance, small size and lower power dissipation, as well as higher reliability. The target of lower power dissipation is important in order to prevent a rise in temperature inside the drive, to realize higher-density packaging and to decrease the quantity of cooling airflow which causes the accumulation of dust.
3
Yang, J. P., C. P. H. Tan, and E. H. Ong. "Enhancement of Hard Disk Drive Heat Dissipations With Integrated Cooling Devices." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69115.
Анотація:
Thermal management has become a significant issue to be considered whilst designing high performance and high reliable hard disk drives (HDD). This paper proposes a compact ultra-thin cooling device for enhancing heat dissipation of HDD. The miniature device was designed and prototyped to its optimal cooling efficiency according to the thermal characteristics of operating HDD. The experimental results of this newly developed device show that it can offer up to 35% enhancement of heat dissipation with a lower power consumption of 10 mW. Furthermore, the low power consumption device has been fully integrated with the disk drive without modifying the structure of the disk drive. This device provides a key for the design engineers in developing reliable and longer operational life hard disk drives.
4
Han, Haochen, Bo Wang, Bo Li, Tengfei Cheng, Hui Fengliu, Yao Zhang, and Fei Chu. "Intelligent Direct-Drive Top Drive Design of Synchronous Permanent Magnet Motor with Phase Change Heat Dissipation." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/214648-ms.
Анотація:
Abstract In drilling operation, drilling NPT caused by top drive mechanical failure and high noisy and energy suffered a lot onsite. This paper introduces a top drive which utilizes a permanent magnet synchronous AC motor to drive the quill directly without a gearbox which can shorten drive chain. Meanwhile, its symmetrical and compact mechanical construction and shorter main and control cables obviously improve installation efficiency and effectively reduce the failure rate. We conducted research through structural design, motor efficiency and heat dissipation, and automation system upgrades to form a set of high-efficiency, high-performance direct drive top drive. Transmission structure aspect: design of direct-drive top drive structure, calculation and verification of main load bearing parts, analysis of top drive failure types and effects. Motor energy efficiency aspect: research on speed measurement method of permanent magnet direct drive motor, precise control method of permanent magnet direct drive motor, and closed phase change heat dissipation technology. Automation enhancement aspect: research on control system architecture, self-diagnosis system, One-click operating system. This study resulted in three research findings including synchronous permanent magnet motor design, One-Click operating system with self-diagnosis and efficient self-circulation heat dissipation technology. The new generation of direct-drive top drive can reduce current required by 100-200A and increase efficiency by 20-30% compared with asynchronous motor, while meeting the requirements of corresponding rated load, rated power, speed and continuous torque. It can realize quill rotation precision less than 1° under load and keep the speed fluctuation reduced from 10.6% to 1.1% by improving the motor dynamic response performance. The One-click control method realized by preset parameters can reduce the driller's repeated operation and visual judgment. The tripping efficiency can be increased by 11.9%, reducing the driller's operation complexity and improving drilling safety. The application of phase-change heat dissipation system can reduce ambient noise to 72dB without external circulating pump. At present, over 10 sets of this new equipment have been delivered and industrial applications have been launched in CNPC Dagang Oilfield, CNPC Weiyuan National Shale-Gas Demonstration Zone and Sinopec NiuYe Shale-Gas Demonstration Zone. Till now nearly 20 wells have been conduct with running trouble-free throughout. Intelligent direct drive top drive of synchronous permanent magnet motor with phase change heat dissipation can not only improve the top drive mechanical transmission efficiency and extend the service life of main components, but also can reduce energy consumption and improve the automation level of top drive, making the top drive further satisfy the high-demanded requirements in drilling operation. We believe that there will be a great demand in deep wells, ultra-deep wells and unconventional oil and gas resources exploitation, which has a broad application prospect and good economic and social benefits.
5
Dyck, Christopher W., James J. Allen, Robert J. Huber, and Jeffry J. Sniegowski. "High Amplitude Secondary Mass Drive." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1092.
Анотація:
Abstract In this paper we describe a high amplitude electrostatic drive for surface micromachined mechanical oscillators that may be suitable for vibratory gyroscopes. It is an advanced design of a previously reported dual mass oscillator (Dyck, et. al., 1999). The structure is a 2 degree-of-freedom, parallel-plate driven motion amplifier, termed the secondary mass drive oscillator (SMD oscillator). During each cycle the device contacts the drive plates, generating large electrostatic forces. Peak-to-peak amplitudes of 54 μm have been obtained by operating the structure in air with an applied voltage of 11 V. We describe the structure, present the analysis and design equations, and show recent results that have been obtained, including frequency response data, power dissipation, and out-of-plane motion.
6
Wang, Mingzong, Jeng Yung Lai, Yu-Po Wang, and C. S. Hsiao. "A Comprehensive Study in Thermal Dissipation Assessment of Hard Disk Drive Component." In 2006 International Conference on Electronic Materials and Packaging. IEEE, 2006. http://dx.doi.org/10.1109/emap.2006.4430612.
7
Lee, Eung Chang, Jinsung Rho, Bong Jae Lee, and Heeyoub Kang. "Heat Dissipation Analysis of M.2 NVMe Solid-State Drive in Vacuum." In 2019 International Vacuum Electronics Conference (IVEC). IEEE, 2019. http://dx.doi.org/10.1109/ivec.2019.8744950.
8
Ghoreishy, H., A. Yazdian, Sh Farhangi, and M. Mohamadian. "Reducing Common-mode voltage and power dissipation in cascaded multilevel inverters with flexible dc sources." In 2010 1st Power Electronic & Drive Systems & Technologies Conference (PEDSTC). IEEE, 2010. http://dx.doi.org/10.1109/pedstc.2010.5471836.
9
Hui-Hui, Huang, Tsai Chien-Hsiung, and He Wei-Ta. "Numerical Modeling of Heat Dissipation inside the Continuously Variable Transmission of a 400cc Scooter." In JSAE/SAE Small Engine Technologies Conference & Exhibition. 10-2 Gobancho, Chiyoda-ku, Tokyo, Japan: Society of Automotive Engineers of Japan, 2017. http://dx.doi.org/10.4271/2017-32-0028.
Анотація:
<div class="section abstract"><div class="htmlview paragraph">In this study, the temperature of solid/fluid inside a continuously variable transmission (CVT) of a 400 cc scooter is investigated numerically utilizing ANSYS FLUENT. The moving reference frame (MRF) technique with conjugate heat transfer between gases and solid rotation/translation are implemented to carry out the simulation. The emphasis of the present study is put on the effects of CVT housing configuration, belt’s thermal conductivity, and the heat dissipated from the crankcase on the thermal-flow-field of CVT.</div><div class="htmlview paragraph">The numerical results show that the temperature of the drive/driven pulleys are concurred with those of experimental results. It is found that the proposed design of partition plate inside the CVT housing can direct the flow into belt and prevent the fluid around driven and drive pulley from mixing, and can further decrease the temperatures of the belt and pulley. The increase of thermal conductivity of belt will increase the average temperature of belt but minimize the temperature difference on it. In addition, the temperature of driven pulley will decrease when belt transition from high ratio to low ratio due to the increase of its rotational speed. The heat dissipation from the crankcase to CVT housing is also explored that the ribs in the housing adjacent to the crankcase served as the fin to enhance the heat transfer from engine to CVT housing. In comparison with the methods proposed by other researchers, this method is found to be the most detailed model.</div></div>
10
Mylnikov, V. Yu, S. O. Potashin, G. S. Sokolovskii, and N. S. Averkiev. "Emergent Equilibrium and Quantum Criticality in Systems with Two-Photon Drive and Dissipation." In 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2023. http://dx.doi.org/10.1109/cleo/europe-eqec57999.2023.10232262.
Звіти організацій з теми "Drive and dissipation":
1
Krommes, J. A. Comments on ''theory of dissipative density-gradient-driven turbulence in the tokamak edge'' (Phys. Fluids 28, 1419 (1985)). Office of Scientific and Technical Information (OSTI), November 1985. http://dx.doi.org/10.2172/6284230.
2
Cahaner, Avigdor, Sacit F. Bilgili, Orna Halevy, Roger J. Lien, and Kellye S. Joiner. effects of enhanced hypertrophy, reduced oxygen supply and heat load on breast meat yield and quality in broilers. United States Department of Agriculture, November 2014. http://dx.doi.org/10.32747/2014.7699855.bard.
Анотація:
Original objectivesThe objectives of this project were to evaluate the growth performance, meat yield and quality attributes of broiler strains widely differing in their genetic potential under normal temperature vs. warm temperature (short and long-term) conditions. Strain differences in breast muscle accretion rate, metabolic responses under heat load and, gross and histopathological changes in breast muscle under thermal load was also to be characterized. BackgroundTremendous genetic progress has been made in broiler chicken growth rate and meat yield since the 1950s. Higher growth rate is driven by higher rates of feed intake and metabolism, resulting in elevated internal heat production. Hot rearing conditions negatively affect broiler growth by hindering dissipation of heat and may lead to a lethal elevation in body temperature. To avoid heat-induced mortality, broilers reduce feed intake, leading to depressed growth rate, lower weight gain, reduce breast meat yield and quality. Thus, the genetic potential of contemporary commercial broilers (CCB) is not fully expressed under hot conditions. Major conclusions, solutions, and achievementsResearch conducted in Israel focused on three broiler strains – CCB, Featherless, Feathered sibs (i.e., sharing similar genetic background). Complimentary research trials conducted at Auburn utilized CCB (Cobb 500, Cobb 700, Ross 308, Ross 708), contrasting their performance to slow growing strains. Warm rearing conditions consistently reduced feed intake, growth rate, feed efficiency, body weight uniformity and breast muscle yield, especially pronounced with CCB and magnified with age. Breast meat quality was also negatively affected, as measured by higher drip loss and paler meat color. Exposure to continuous or short-term heat stress induced respiratory alkalosis. Breast muscle histomorphometrics confirmed enhanced myofiber hypertrophy in CCB. Featherless broilers exhibited a significant increase in blood-vessel density under warm conditions. Rapid growth and muscle accretion rate was correlated to various myopathies (white striping, woody and necrotic) as well as to increases in plasma creatinekinase levels. Whether the trigger(s) of muscle damage is loss of cellular membrane integrity due to oxidative damage or tissue lactate accumulation, or to loss of inter-compartmental cation homeostasis is yet to be determined. Based on genome-wide single-nucleotide polymorphism array genotyping, identification of the gene with the recessive mutation Scaleless (sc) facilitated the development a dCAPS assay to discriminate between sc carrier (sc/+) and non-carrier (+/+) individuals. ImplicationsThis project confirmed that featherless broiler strains grow efficiently with high yield and quality of breast meat, even under warm rearing conditions that significantly depress the overall performance of CCB. Therefore, broiler meat production in hot regions and climates can be substantially improved by introducing the featherless gene into contemporary commercial broiler stocks. This approach has become more feasible with the development of dCAPS assay. A novel modification of the PCR protocol (using whole blood samples instead of extracted DNA) may contribute to the efficient development of commercial featherless broiler strains. Such strains will allow expansion of the broiler meat production in developing countries in warm climates, where energy intensive environmental control of rearing facilities are not economical and easily achievable.