scholarly journals S-, P- and R-striations as attractors for electron phase trajectories in spatially periodic resonance fields

2021 ◽  
Vol 2103 (1) ◽  
pp. 012216
Author(s):  
Yuri Golubovskii ◽  
Tatiana Gurkova ◽  
Sergei Valin
Keyword(s):  
Boltzmann Equation ◽  
Positive Column ◽  
Tuning Fork ◽  
Point Of View ◽  
Inert Gases ◽  
Dynamic Approach ◽  
Phase Trajectories ◽  
Resonant Modes ◽  
Resonance Properties ◽  
Spatially Periodic

Abstract A new point of view on the appearance of S-, P- and R-striations in a positive column of inert gases is proposed, based on a dynamic analysis of the resonance properties of electron phase trajectories in spatially periodic fields. The positive column may be considered as a resonator containing a set of resonant modes. Like a tuning fork, being disturbed, it responds with one of the modes, in particular with of S-, P-, or R-modes or striations, depending on the discharge conditions. The dynamic approach eliminates the difficulties of the kinetic theory associated with the long length of the solution of Boltzmann equation, which is much greater than the length of the positive column.

A comparison of kinetic and fluid models of the positive column of discharges in inert gases

1999 ◽  
Vol 32 (4) ◽  
pp. 456-470 ◽  
Author(s):  
Yu B Golubovskii ◽  
I A Porokhova ◽  
J Behnke ◽  
J F Behnke
Keyword(s):  
Positive Column ◽  
Inert Gases ◽  
Fluid Models

scholarly journals Influence of Tuning Fork Resonance Properties on Quartz-Enhanced Photoacoustic Spectroscopy Performance

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3825 ◽  
Author(s):  
Huadan Zheng ◽  
Haoyang Lin ◽  
Lei Dong ◽  
Yihua Liu ◽  
Pietro Patimisco ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Quality Factor ◽  
Photoacoustic Spectroscopy ◽  
Electrical Resistance ◽  
Tuning Fork ◽  
Resonance Frequencies ◽  
Resonance Properties ◽  
Tuning Forks ◽  
Quartz Tuning Forks ◽  
Fundamental Resonance Frequency

A detailed investigation of the influence of quartz tuning forks (QTFs) resonance properties on the performance of quartz-enhanced photoacoustic spectroscopy (QEPAS) exploiting QTFs as acousto-electric transducers is reported. The performance of two commercial QTFs with the same resonance frequency (32.7 KHz) but different geometries and two custom QTFs with lower resonance frequencies (2.9 KHz and 7.2 KHz) were compared and discussed. The results demonstrated that the fundamental resonance frequency as well as the quality factor and the electrical resistance were strongly inter-dependent on the QTF prongs geometry. Even if the resonance frequency was reduced, the quality factor must be kept as high as possible and the electrical resistance as low as possible in order to guarantee high QEPAS performance.

OBSERVING DISTRIBUTION IN PROCESSES: STATIC AND DYNAMIC LOCALITIES

1995 ◽  
Vol 06 (04) ◽  
pp. 353-393 ◽  
Author(s):  
ILARIA CASTELLANI
Keyword(s):  
Local History ◽  
Transition System ◽  
Point Of View ◽  
Dynamic Approach ◽  
Distributed Structure ◽  
Static Approach ◽  
Definition Of ◽  
Location Equivalence

The distributed structure of CCS processes can be made explicit by assigning different locations to their parallel components. These locations then become part of what is observed of a process. The assignment of locations may be done statically, or dynamically as the execution proceeds. The dynamic approach was developed first, in Refs. [4,5], as it appeared to be more convenient for defining notions of location equivalence and preorder. Extending previous work by L. Aceto1 we study here the static approach, which is more natural from an intuitive point of view, and more manageable for verification purposes. We define static notions of location equivalence and preorder, and show that they coincide with the dynamic ones. To establish the equivalence of the two location semantics, we introduce an intermediate transition system called occurrence system, which incorporates both notions of locality. This system supports a definition of local history preserving bisimulation for CCS, which is a third formulation of location equivalence.

Magnetic Relaxation of γ-Fe2O3 Nanoparticles Arrangements and Electronic Phase-Segregated Systems

2008 ◽  
Vol 8 (6) ◽  
pp. 2883-2890 ◽  
Author(s):  
C. E. Hoppe ◽  
F. Rivadulla ◽  
J. Vidal-Vidal ◽  
M. A. López-Quintela ◽  
J. Rivas
Keyword(s):  
Magnetic Particles ◽  
Point Of View ◽  
Theoretical Point ◽  
Dipolar Interactions ◽  
Dynamic Approach ◽  
Classical Systems ◽  
Electronic Phase ◽  
Effective Particle ◽  
Magnetic States ◽  
Concentrated Systems

γ-Fe2O3 nanoparticles have been synthesized and dispersed in a polymeric matrix, forming a series of composites with different concentrations of magnetic particles. The effect of volume polydispersity and dipolar interactions on the relaxation behavior is discussed. We have paid special attention to the dynamic approach to discuss a possible true superspin-glass transition in highly concentrated composites. To avoid the practical limitations that appear in highly concentrated systems of particles, like the formation of aggregates, etc., we have studied the glassy phase that appears spontaneously in certain strongly electronic correlated materials close to a metal-insulator transition. It must be emphasized that from a theoretical point of view these inhomogenous magnetic states could present important advantages over classical dispersions of particles, like field-control of the effective particle size. The results are compared with other recently obtained for classical systems of particles.

Structural and dynamic descriptions of the development of Utricularia foliosa and U. australis

1990 ◽  
Vol 68 (9) ◽  
pp. 1989-2003 ◽  
Author(s):  
Rolf Sattler ◽  
Rolf Rutishauser
Keyword(s):  
Electron Microscopy ◽  
Leaf Development ◽  
Point Of View ◽  
Developmental Morphology ◽  
Dynamic Approach ◽  
Plant Form ◽  
Dynamic Description ◽  
Structural Descriptions ◽  
Process Combination ◽  
Scanning Electron

In this developmental investigation of Utricularia foliosa and U. australis by means of scanning electron microscopy we demonstrate the relativity of morphological facts and descriptions. We provide several descriptions in terms of the structural categories "stem" and '"leaf." These contrasting, if not contradictory, descriptions are complementary to each other, i.e., they present different aspects of the unusual complexity of these species. In addition to these structural descriptions, we provide a dynamic description in terms of process morphology. According to this dynamic approach, each form is seen as a process combination. Structural change during ontogeny and phylogeny is a change in process combinations. From this point of view, the unusual process combinations of the two Utricularia species do not pose a morphological problem, although they cannot be clearly assigned to mutually exclusive categories such as stem and leaf. In addition to the clarification of the developmental morphology of the two Utricularia species, this investigation illustrates process morphology as a general approach to the description and comparison of plant form. The relevance of this approach to other biological disciplines such as cladistics is briefly indicated. Key words: Utricularia, Lentibulariaceae, shoot development, leaf development, morphogenesis, process morphology.

scholarly journals Dynamic Quantum Tomography Model for Phase-Damping Channels

2016 ◽  
Vol 23 (04) ◽  
pp. 1650019 ◽  
Author(s):  
Artur Czerwiński ◽  
Andrzej Jamiołkowski
Keyword(s):  
Open Quantum Systems ◽  
Initial Density ◽  
Main Idea ◽  
Quantum Tomography ◽  
Quantum Systems ◽  
Point Of View ◽  
Dynamic Approach ◽  
Open Quantum ◽  
Phase Damping ◽  
Strong Motivation

In this paper we propose a dynamic quantum tomography model for open quantum systems with evolution given by phase-damping channels. Mathematically, these channels correspond to completely positive trace-preserving maps defined by the Hadamard product of the initial density matrix with a time-dependent matrix which carries the knowledge about the evolution. Physically, there is a strong motivation for considering this kind of evolution because such channels appear naturally in the theory of open quantum systems. The main idea behind a dynamic approach to quantum tomography claims that by performing the same kind of measurement at some time instants one can obtain new data for state reconstruction. Thus, this approach leads to a decrease in the number of distinct observables which are required for quantum tomography; however, the exact benefit for employing the dynamic approach depends strictly on how the quantum system evolves in time. Algebraic analysis of phase-damping channels allows one to determine criteria for quantum tomography of systems in question. General theorems and observations presented in the paper are accompanied by a specific example, which shows step by step how the theory works. The results introduced in this paper can potentially be applied in experiments where there is a tendency to look at quantum tomography from the point of view of economy of measurements, because each distinct kind of measurement requires, in general, preparing a separate setup.

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