scholarly journals Anisotropic Nucleation, Growth and Ripening under Stirring—A Phenomenological Model

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1254
Author(s):  
Andriy Gusak ◽  
Yaroslav Huriev ◽  
Jürn W. P. Schmelzer
Keyword(s):  
Open System ◽  
Phenomenological Model ◽  
Homogeneous Nucleation ◽  
Main Parameter ◽  
Open Systems ◽  
Kinetic Equations ◽  
Aggregation Kinetics ◽  
External Influence ◽  
Ripening Stage ◽  
Anisotropic Formation

The anisotropic formation of elongated metal-oxide aggregates in water under intensive stirring is analyzed. It is treated in terms of anisotropic ballistically mediated aggregation kinetics in open systems. The basic kinetic equations describing the stages of homogeneous nucleation, independent growth, and ripening of the aggregates are formulated for the open system under the external influence with the stirring intensity as the main parameter governing the process. The most significant elongation of the aggregates is shown to evolve at the ripening stage.

THE QUANTUM TRAJECTORY APPROACH TO GEOMETRIC PHASE FOR OPEN SYSTEMS

2005 ◽  
Vol 20 (22) ◽  
pp. 1635-1654 ◽  
Author(s):  
ANGELO CAROLLO
Keyword(s):  
Quantum System ◽  
Open System ◽  
Geometric Phase ◽  
Open Systems ◽  
Quantum Trajectory ◽  
Operational Method ◽  
Markovian Approximation ◽  
Physical Systems ◽  
Quantum Jump ◽  
Trajectory Approach

The quantum jump method for the calculation of geometric phase is reviewed. This is an operational method to associate a geometric phase to the evolution of a quantum system subjected to decoherence in an open system. The method is general and can be applied to many different physical systems, within the Markovian approximation. As examples, two main source of decoherence are considered: dephasing and spontaneous decay. It is shown that the geometric phase is to very large extent insensitive to the former, i.e. it is independent of the number of jumps determined by the dephasing operator.

Aspects of the weak-coupling theory of open systems

1983 ◽  
Vol 61 (11) ◽  
pp. 1479-1485 ◽  
Author(s):  
I. D. Cox ◽  
W. E. Hagston ◽  
B. J. Holmes
Keyword(s):  
Perturbation Theory ◽  
Open System ◽  
Weak Coupling ◽  
Open Systems ◽  
Higher Order ◽  
Projection Operators ◽  
Coupling Theory ◽  
Weak Coupling Theory ◽  
Damping Theory ◽  
Insight Into

Damping theory of an open system S is usually formulated in terms of projection operators which introduce nonuniqueness into the analysis. An insight into the nature of the approximations that arise from this aspect of the formalism is revealed by considering systems of varying complexity. This leads to the conclusion that the results of higher order perturbation theory approximations may not be meaningful.

scholarly journals A Generalized Monte Carlo Approach for the Analysis of Quantum-Transport Phenomena in Mesoscopic Systems: Interplay Between Coherence and Relaxation

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 197-202
Author(s):  
Fausto Rossi ◽  
Stefano Ragazzi ◽  
Aldo Di Carlo ◽  
Paolo Lugli
Keyword(s):  
Monte Carlo ◽  
Quantum Transport ◽  
Open Systems ◽  
Transport Phenomena ◽  
Kinetic Equations ◽  
Numerical Approach ◽  
Mesoscopic Systems ◽  
Bloch Oscillations ◽  
Self Energy ◽  
Spatial Boundary

A theoretical investigation of quantum-transport phenomena in mesoscopic systems is presented. In particular, a generalization to “open systems” of the well-known Semiconductor Bloch equations is proposed. Compared to the conventional Bloch theory, the presence of spatial boundary conditions manifest itself through self-energy corrections and additional source terms in the kinetic equations, which are solved by means of a generalized Monte Carlo simulation.The proposed numerical approach is applied to the study of the scattering-induced suppression of Bloch oscillations in semiconductor superlattices as well as to the analysis of quantum-transport phenomena in double-barrier structures.

THE RECONSTRUCTION OF THE FOKKER-PLANCK AND MASTER EQUATIONS ON THE BASIS OF EXPERIMENTAL DATA: H-THEOREM AND S-THEOREM

1993 ◽  
Vol 03 (01) ◽  
pp. 119-129 ◽  
Author(s):  
Yu. L. KLIMONTOVICH
Keyword(s):  
Open Systems ◽  
Kinetic Equations ◽  
Master Equations ◽  
Stationary States ◽  
Control Parameters ◽  
Experimental Time Series ◽  
H Theorem ◽  
The Mean ◽  
The Given ◽  
Fokker Planck

The method of reconstruction of Fokker-Planck and Master equations for nonlinear open systems on the basis of experimental time series is considered. In the process of time evolution the entropy of a system, renormalized to the given value of the mean effective energy, increases in accordance with the kinetic equations (H-theorem). The evolution of the renormalized entropy of stationary states in the space of rule (control) parameters is also considered (S-theorem).

E-Cigarettes: Policy Options and Legal Issues Amidst Uncertainty

2015 ◽  
Vol 43 (S1) ◽  
pp. 23-26 ◽  
Author(s):  
Nancy Kaufman ◽  
Margaret Mahoney
Keyword(s):  
Smoking Cessation ◽  
Propylene Glycol ◽  
Open System ◽  
Closed System ◽  
Open Systems ◽  
Delivery Systems ◽  
Legal Issues ◽  
Policy Options ◽  
Electronic Nicotine Delivery Systems ◽  
Closed Systems

E-cigarettes, sometimes referred to as ENDS (Electronic Nicotine Delivery Systems), include a broad range of products that deliver nicotine via heating and aerosolization of the drug. ENDS come in a variety of forms, but regardless of form generally consist of a solution containing humectant (e.g., propylene glycol or glycerol), flavorings, and usually nicotine (some solutions do not contain nicotine); a battery-powered coil that heats the solution into an aerosol (usually referred to as vapor) in an atomizing chamber; and a mouthpiece through which the user draws the vapor into the mouth and lungs. The devices may be closed systems containing prefilled cartridges, or open systems, where the user manually refills a 1-2 ml. tank with solution. What started as closed-system cigarette-shaped devices marketed as an adjunct for smoking cessation, has transitioned rapidly to literally thousands of hip and funky-designed open-system hookah pens, vape pens, and modifiable devices. For younger people, these forms are the “in” thing, while traditional cigarette-shaped devices are “out.”

scholarly journals Economics and interdisciplinarity: an open-systems approach

2017 ◽  
Vol 37 (2) ◽  
pp. 343-362
Author(s):  
VÍTOR NEVES
Keyword(s):  
Political Economy ◽  
Open System ◽  
Systems Approach ◽  
Open Systems ◽  
Object Of Study

ABSTRACT This is a text on economics and interdisciplinarity. It takes account of the plurality of meanings that the practice of interdisciplinarity has assumed in economics, discusses why interdisciplinarity is essential to the study of the economy and analyzes two models of what interdisciplinarity should be in economics. Reference is also made to the obstacles inherent in the practice of interdisciplinarity. Its ultimate goal is to show why the economy (as an object of study), being an open system, cannot be left to economists alone requiring, instead, a pluralistic, political economy understanding of the ‘economic’.

scholarly journals THE POSITION FILLING OF PRATAMA HIGH LEADERSHIP IN CIANJUR REGENCY UNDER GOOD GOVERNANCE CONCEPT

2017 ◽  
Vol 17 (2) ◽  
pp. 129
Author(s):  
Tanti Kirana Utami
Keyword(s):  
Open System ◽  
Good Governance ◽  
Open Systems ◽  
Descriptive Analysis ◽  
The State ◽  
Fundamental Change ◽  
Competitive System ◽  
Selection Committee ◽  
Triangulation Method ◽  
Local Agencies

A fundamental change in terms of structuring government apparatus particularly position filling of pratama high leadership in local agencies openly aimed to realize good governance. This paper examines the application of open systems in position filling of pratama high leadership of regional secretary in Cianjur and the government's readiness of Cianjur regency in the implementation of position filling of pratama high leadership (regional secretary). This research applied normative juridical approach by descriptive analysis while the analysis of data used triangulation method. The results of this study are the position filling of pratama high leadership (regional secretary) in Cianjur already introduced an open and competitive system by forming a selection committee to establish and coordinate with the State Civil Administrative Commission in the implementation of the administration and the competence of official candidates. In filling the position of high leadership, a regulation of sanctions and rewards for position of pratama high leadership related to the performance is required.Keywords: position of Pratama high leadership, open system, good governance

scholarly journals Time-local unraveling of non-Markovian stochastic Schrödinger equations

Quantum ◽  
2017 ◽  
Vol 1 ◽  
pp. 29 ◽  
Author(s):  
Antoine Tilloy
Keyword(s):  
Numerical Simulation ◽  
Quantum Mechanics ◽  
Random Field ◽  
Open System ◽  
Open Systems ◽  
Schrodinger Equations ◽  
Auxiliary Equation ◽  
Simulation Algorithm ◽  
Schrödinger Equations ◽  
Short Times

Non-Markovian stochastic Schrödinger equations (NMSSE) are important tools in quantum mechanics, from the theory of open systems to foundations. Yet, in general, they are but formal objects: their solution can be computed numerically only in some specific cases or perturbatively. This article is focused on the NMSSE themselves rather than on the open-system evolution they unravel and aims at making them less abstract. Namely, we propose to write the stochastic realizations of linear NMSSE as averages over the solutions of an auxiliary equation with an additional random field. Our method yields a non-perturbative numerical simulation algorithm for generic linear NMSSE that can be made arbitrarily accurate for reasonably short times. For isotropic complex noises, the method extends from linear to non-linear NMSSE and allows to sample the solutions of norm-preserving NMSSE directly.

Amplifying the Significance of Systems Theory

2017 ◽  
pp. 301-308
Author(s):  
Mambo Mupepi
Keyword(s):  
System Theory ◽  
Open System ◽  
Closed System ◽  
Open Systems ◽  
System Behavior ◽  
Internal Dynamics ◽  
Key Stakeholders ◽  
Stable Performance ◽  
Regulate System ◽  
Increase Productivity

In system theory organizations are viewed as closed or open systems. An open system interacts with the environment for its sustainability. The closed system does not interact with its setting consequently its behavior depends largely on internal dynamics of its parts. The centricity of an open organizational structure is one created and empowered to learn and change very fast to successfully achieve desired goals. However open systems need to embrace change as follows: transform inputs of energy and information to produce the products demanded by the customers, transact with key stakeholders to access resources, regulate system behavior to achieve stable performance, and adapt to continuously changing high velocity competition to increase productivity.

Biological applications of kinetic analysis of a two-compartment open system

1961 ◽  
Vol 16 (5) ◽  
pp. 771-782 ◽  
Author(s):  
Moris L. Shore
Keyword(s):  
Open System ◽  
Open Systems ◽  
Specific Activity ◽  
Biological Systems ◽  
Central Compartment ◽  
Graphical Analysis ◽  
Primary Data ◽  
Total Rate ◽  
Practical Applications ◽  
System Data

Complex metabolic steady state systems in which a central compartment (blood) exchanges compound with independent peripheral compartments (tissues), with synthesis and loss of compound occurring in the system, are examined. Factors that result in the simplification of complex biological systems into two-compartment open systems are discussed. Equations are derived for the two-compartment open system which allow calculation of: compartment size for central and combined peripheral compartments, total rate of exchange between these compartments, and total rate of synthesis and loss of compound from the system. Data required for these calculations can be obtained with relative ease from the accessible central compartment. Thus, a tracer dose of labeled compound is introduced into the central compartment and the specific activity-time relations of the compound are determined. Values derived by graphical analysis of this curve and knowledge of the dose of labeled compound administered are the only primary data needed to determine the parameters of the system. Practical applications of this analysis to model and biological systems are presented. Submitted on March 13, 1961

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