Abstract
In this note we compare the views of Bohr (known as the Copenhagen interpretation of quantum mechanics) with the views of Bell: complementarity versus nonlocality.
1 Introduction
Success of the recent experiments to violate the Bell inequality [1] aimed to close all basic loopholes[1] [2, 3, 4] give the impression that the last chapter of the long “EPR-Bell story” has been finally completed, see [5, 6] for assertions of this point of view (but cf. [7, 8]). My personal conviction is that no experiment (independent of its excellence) can be used as the deciding argument in the debates related to meaning of the phrase “violation of Bell’s inequality”, see [8]. Therefore, although this special issue has some orientation toward the analysis of loopholes, this note is devoted to foundational aspects. At the same time it is clear that further analyses of loopholes and experimental data are needed, cf. [9, 10, 11].
The main aim of this note is not to confront local realism, the quantum theory and experiment (as it is typically done), but to analyze the additional impact of Bell’s argument on the foundations of quantum theory. I compare the positions of Bohr and Bell, complementarity versus nonlocality. To appreciate the following, we must not forget that (at least originally) Bell was very sympathetic to the ideas of Bohm about the emergence of quantum mechanics from a nonlocal realistic theory - Bohmian mechanics.[2] (Some prominent Bohmians are even angry that the “Bell-project” (including experiments) did not lead to the world-wide recognition of Bohmian mechanics as the only correct interpretation of quantum mechanics.) Nonlocality is an “additional element” which Bell consistently advertised for the quantum foundations. My position is that this additional element is entirely unnecessary and that the consequences of the experimental violations of Bell’s inequality are zero when compared to the experimental confirmation of interference in quantum systems! Of course, this is true only from the viewpoint of quantum foundations. The Bell-type experiments have a great technological value, since they demonstrated that correlations between quantum systems can survive at very long distances [12].
2 Bohr’s complementarity
There is general feeling that the writings of Niels Bohr [13] are difficult to understand. Therefore few researchers read Bohr: the young generation of quantum physicist has typically never read Bohr (nor von Neumann). In fact, however, Bohr’s position is very clear:
(B1): An output of any observable is composed of contributions from a system under measurement and the measurement device.
(B2): Therefore the whole experimental arrangement (context) has to be taken into account.
(B3): There is no reason to expect that all experimental contexts can be combined. Therefore there is no reason to expect that all observables can be measured jointly. This is the essence of the principle of complementarity. Hence, there can exist incompatible observables. Their existence is proved by interference experiments.
Comments
(CB2): Here context is understood generally as a complex of experimental physical conditions. So, it is not reduced to a measurement of a compatible observable, as it is common in modern discussions about quantum contextuality. The Bohr viewpoint on context was elaborated in my previous work, see, e.g., monograph [16].
(CB3): The principle of complementarity is so natural that one should be surprised if it were not valid. The main reason for being surprised by quantum complementarity is that the preceding probabilistic model, classical statistical mechanics, was formulated without the reference to this principle. Here the observable and intrinsic features of systems were identified. We remark that the principle of complementarity was better: assimilated by Bohr from psychology, where the existence of the complementarity of cognitive contexts was widely accepted [17]. Moreover, it seems that classical statistical mechanics is the only model of natural science and humanities that can neglect this principle.
Niels Bohr elaborated on these views in the process of the analysis of Heisenberg’s uncertainty principle and the two slit experiment. The latter was considered as a set of three experiments, corresponding to three different experimental contexts: C12 - both slits are open, C1 - only the upper slit is open, C2 only the lower slit is open. Interference experiments for a variety of quantum systems provide the experimental confirmation of Bohr’s principle of complementarity.
We now present the direct citation of Bohr (from his discussions with Einstein [18]) - just to show that Bohr is readable[3]:
“The new progress in atomic physics was commented upon from various sides at the International Physical Congress held in September 1927, at Como in commemoration of Volta. In a lecture on that occasion, I advocated a point of view conveniently termed “complementarity”… This crucial point, which was to become a main theme of the discussions reported in the following, implies the impossibility of any sharp separation between the behaviour of atomic objects and the interaction with the measuring instruments which serve to define the conditions under which the phenomena appear. In fact, the individuality of the typical quantum effects finds its proper expression in the circumstance that any attempt of subdividing the phenomena will demand a change in the experimental arrangement introducing new possibilities of interaction between objects and measuring instruments which in principle cannot be controlled. Consequently, evidence obtained under different experimental conditions cannot be comprehended within a single picture, but must be regarded as complementary in the sense that only the totality of the phenomena exhausts the possible information about the objects.” Under these circumstances an essential element of ambiguity is involved in ascribing conventional physical attributes to atomic objects, as is at once evident in the dilemma regarding the corpuscular and wave properties of electrons and photons, where we have to do with contrasting pictures, each referring to an essential aspect of empirical evidence.
We comment that often Bohr’s principle of complementarity is reduced to (B3), existence of complementary experimental contexts. However, as we can see from Bohr’s writing, (B1) and (B2) are the fundamental counterparts of this principle.
We now briefly discuss the EPR-Bohr debate. Many authors point to lack of clarity of Bohr’s reply [19] to the EPR paper [20]. However, the reply can be summarized in a very simple way: it is impossible to measure in one experiment incompatible observables even in the EPR-setting; therefore the EPR definition of realism is metaphysical - the end of the debate (from Bohr’s viewpoint).
3 Probabilistic representation of Bohr’s complementarity
A weak side of Bohr’s position is that he did not use the formal probabilistic framework for the principle of complementarity. However, this can be explained by a purely historical reason: the rigorous mathematical formalization of classical probability theory was finished by A. N. Kolmogorov only in 1933 [21].
The probabilistic representation of the principle of complementarity is given in the framework of contextual probability theory elaborated by the author [16]. Here each experimental context C generates its own probability space, a triple 𝓟C = (ΩC, 𝓕C, PC), where ΩC is a set of elementary events, 𝓕C is a system of subsets of ΩC representing events (mathematically formalized as so-called σ-algebra), and PC is a probability measure on 𝓕C. Observables are represented by random variables, maps ξ: ΩC → R such that for any interval A⊂ R its inverse image ξ−1(A) = {ω ∈ ΩC: ξ(ω) ∈ A} ∈ 𝓕. The latter condition gives the possibility to define the probability distribution of a random variable, pξ(A) = PC(ω ∈ ΩC: ξ(ω) ∈ A). If a few observables are compatible, i.e., they can be measured under the common experimental context C, then they can be represented as random variables on the same probability space 𝓟C. In this (and only this) case their joint probability distribution is well defined:
Although the consistent representation of contextual probability theory was finalized only recently [16], the founders of probability theory were well aware of the context-dependence of probabilistic representations. In Kolmogorov’s book [21] presenting the axiomatics of the modern probability theory, it was explicitly pointed out that each complex of experimental conditions (in our terminology - context) generates its own probability space, see section 2 [21]. Unfortunately, Kolmogorov did not label probability spaces by the context index. And it appears that this very important interpretational issue was completely missed by readers of his book. Later he published a paper (but in Russian) explaining the contextuality of probability, see [22]. Here all probabilities were labeled by corresponding contexts, he used notation P(A| C). He stressed that in general this is not the usual classical conditional probability given by the Bayes formula. Unfortunately, this paper is practically unknown (I got to know about it from the former students of Kolmogorov, Bulinskii and Shiryaev, in a private conversation). Moreover, already in the 19th century Boole (who presented one of the first rigorous mathematical models of probability [23], [24]) pointed to the existence of incompatible observables and studied conditions for the existence of the common probability representation for a group of observables. He was the first who derived the inequality which nowadays is known as the Bell inequality. Later in the early 1960s Soviet probabilist Vorob’ev investigated this problem in great detail [25]. He derived all inequalities which then were rediscovered by physicists. However, the main stream of probability theory ignored this important problem[4] and the interest to Boole-Vorob’ev type inequalities was generated only after the works of Bell who derived independently one of such inequalities. We stress once again that in mathematics such studies were considered as studies about compatibility of observables and the possibility to represent them in a common probability space.
4 Does the Copenhagenist need nonlocality?
The Bell argument is based on the violation of some inequalities for joint probabilities or correlations [16, 22, 27, 28], which can be derived only under the assumption that there exists the common (Kolmogorov) probability space 𝓟 in which all observables involved in such inequalities can be jointly represented as random variables. In physical terms these observables should be compatible. A follower of the Copenhagen interpretation sharing the views of Niels Bohr would not be able to derive the Bell inequality for observables considered in Bell’s argument. Thus he would say that Bell’s argument contradicts the Copenhagen interpretation of quantum mechanics.
We want to stress that one who accepts the Copenhagen interpretation would not need nonlocality to explain a violation of Bell’s inequality for quantum observables. For him, this is the direct consequence of the principle of complementarity. For Copenhagenist, an experimental violation of Bell’s inequality is just another confirmation of the principle of complementarity, so to say a complement to the interference experiment. (In fact, the situation is even simpler: experiments to violate Bell’s inequality can be reformulated in the form of interference experiments [29]).
Of course, someone who rejects the Copenhagen interpretation can be excited by Bell’s attempt to go beyond quantum theory. But even for such a person, the initial guess would be that the principle of complementarity might be violated. At least its violation sounds not as mystical as nonlocality.
5 Are novel quantum technologies based on spooky action at a distance?
There is the very common opinion that the present quantum technological revolution is based on “new quantum mechanics” and that quantum nonlocality is the most important foundational component of this revolution. I am not sure that this opinion is justified. It seems that complementarity (interference) is the most basic foundational condition of successful development of quantum technologies. Consider the project on quantum random generators. “Irreducible quantum randomness” (what ever it means) was invented by von Neumann and it is totally based on complementarity, see (B1), section 2. Quantum cryptography is a consequence of complementarity, see (B3), section 2.
Now we move to the most exciting feature of quantum systems - entanglement. However, by itself an entangled state ψ ∈ H1 ⊗ H2 represented as superposition of the form
for the two fixed bases |i〉1 and |j〉2 (in corresponding Hilbert state spaces) does not exhibit nonclassical features. Nonclassicality arises from the possibility to operate with superpositions with respect to “incompatible bases”, i.e., complementarity of the observables of the form Ak ⊗ Bk, k = 1,2,… Of course, the conventionally oriented fellow would emphasize that nonseparability is not a consequence of complementarity. And this is correct. But, nonseparability is just the quantum mechanical representation of correlations between degrees of freedom of two systems. If Ψ is separable, Ψ = Ψ1 ⊗ Ψ2, then mathematical expectations are factorisable:
(there are no correlations at the level of mathematical expectations of the observables). If Ψ is entangled, then we can find two such observables A and B that
In quantum information theory loudly emphasizes the entangled states are more powerful information resource than separable states. But who would be surprised that correlations carry the additional information resource? See paper [30] on entanglement for classical Brownian motions for further discussion.
Now we turn to the most complicated issue, quantum computing.[5] I again claim that complementarity, i.e., the existence and the possibility to process in parallel complementary representations of information, is the crucial issue in justification of quantum computing. Entanglement provides an additional (and very important) computational resource as carrying correlations which are produced in the processes of preparation and the dynamical performance of quantum algorithms. The latter can be based either on the unitary Schrödinger dynamics or dynamics described by theory of open quantum systems, e.g., in its approximate form based on Gorini-Kossakowski-Sudarshan-Lindblad equation. It would be interesting to present this heuristic statement in the formal mathematical framework.
Since we started to speak about the state dynamics, this is a good place to point to one of the main distinguishing contributions of quantum information theory: emphasizing the possibility of preserving complementarity[6]and correlations encoded in entangled state during the state dynamics. Of course, it was important to find the right quantum variables with such features. In fact, it was done by Bohm who reformulated the EPR-argument by using electron’s spin projections, instead of the position and momentum observables. This approach was automatically extended to photon’s polarization projections. The following experimental research to demonstrate preserving of correlations and complementarity (culminated in [2, 3, 4]) played the determining role in development of quantum information theory and modern quantum technologies.
Thus “new quantum mechanics” based on the quantum information theory foundationally is the same as “old quantum mechanics” of Bohr and Heisenberg.[7] Finally, we remark that all basic foundational features of entangled states can be found already in the book of von Neumann (although he did not use the term “entanglement”). Von Neumann treated entanglement in the framework of Bohr’s complementarity, see [31] for English edition.
6 Concluding remarks
One cannot sit on two chairs. Either you follow the conventional quantum theory and the incompatibility interpretation of observables represented by non-commuting operators in this theory or you involve the so-called “quantum nonlocality”.
Even those who reject Bohr’s views and wish to go beyond quantum theory, should rather question the principle of complementarity and the existence of incompatible observables.
Those who are interested in quantum nonlocality must find a possibility to separate the issues of nonlocality and incompatibility. If this mystical action at a distance cannot be uncoupled from complementarity then, by Occam’s Razor argument, nonlocality should be rejected as unnecessary addition to the theory.
Acknowledgement
This paper was partially supported by the EU-project “Quantum Information Access and Retrieval Theory” (QUARTZ), Grant No. 721321.
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© 2017 Andrei Khrennikov
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
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- The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Erratum to: The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Rhetoric, logic, and experiment in the quantum nonlocality debate
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- What If Quantum Theory Violates All Mathematics?
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Relativity, anomalies and objectivity loophole in recent tests of local realism
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- The photon identification loophole in EPRB experiments: computer models with single-wing selection
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Bohr against Bell: complementarity versus nonlocality
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Is Einsteinian no-signalling violated in Bell tests?
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Bell’s “Theorem”: loopholes vs. conceptual flaws
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Nonrecurrence and Bell-like inequalities
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Three-dimensional computer models of electrospinning systems
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Electric field computation and measurements in the electroporation of inhomogeneous samples
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Modelling of magnetostriction of transformer magnetic core for vibration analysis
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Comparison of the fractional power motor with cores made of various magnetic materials
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Dynamics of the line-start reluctance motor with rotor made of SMC material
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Inhomogeneous dielectrics: conformal mapping and finite-element models
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Topology optimization of induction heating model using sequential linear programming based on move limit with adaptive relaxation
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Detection of inter-turn short-circuit at start-up of induction machine based on torque analysis
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Current superimposition variable flux reluctance motor with 8 salient poles
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Modelling axial vibration in windings of power transformers
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Field analysis & eddy current losses calculation in five-phase tubular actuator
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Hybrid excited claw pole generator with skewed and non-skewed permanent magnets
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Electromagnetic phenomena analysis in brushless DC motor with speed control using PWM method
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Field-circuit analysis and measurements of a single-phase self-excited induction generator
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- A comparative analysis between classical and modified approach of description of the electrical machine windings by means of T0 method
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Field-based optimal-design of an electric motor: a new sensitivity formulation
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Application of the parametric proper generalized decomposition to the frequency-dependent calculation of the impedance of an AC line with rectangular conductors
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Virtual reality as a new trend in mechanical and electrical engineering education
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Holonomicity analysis of electromechanical systems
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- An accurate reactive power control study in virtual flux droop control
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Localized probability of improvement for kriging based multi-objective optimization
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Research of influence of open-winding faults on properties of brushless permanent magnets motor
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Optimal design of the rotor geometry of line-start permanent magnet synchronous motor using the bat algorithm
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Model of depositing layer on cylindrical surface produced by induction-assisted laser cladding process
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Detection of inter-turn faults in transformer winding using the capacitor discharge method
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- A novel hybrid genetic algorithm for optimal design of IPM machines for electric vehicle
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Lamination effects on a 3D model of the magnetic core of power transformers
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Detection of vertical disparity in three-dimensional visualizations
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Calculations of magnetic field in dynamo sheets taking into account their texture
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- 3-dimensional computer model of electrospinning multicapillary unit used for electrostatic field analysis
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Optimization of wearable microwave antenna with simplified electromagnetic model of the human body
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Induction heating process of ferromagnetic filled carbon nanotubes based on 3-D model
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Speed control of an induction motor by 6-switched 3-level inverter
Articles in the same Issue
- Regular Articles
- Analysis of a New Fractional Model for Damped Bergers’ Equation
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- Optimal homotopy perturbation method for nonlinear differential equations governing MHD Jeffery-Hamel flow with heat transfer problem
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- Distributed containment control of heterogeneous fractional-order multi-agent systems with communication delays
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- Quantum mechanics with geometric constraints of Friedmann type
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- Analysis of Drude model using fractional derivatives without singular kernels
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- An unsteady MHD Maxwell nanofluid flow with convective boundary conditions using spectral local linearization method
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- New analytical solutions for conformable fractional PDEs arising in mathematical physics by exp-function method
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- CO2 capture by polymeric membranes composed of hyper-branched polymers with dense poly(oxyethylene) comb and poly(amidoamine)
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- Chain on a cone
- Regular Articles
- Multi-task feature learning by using trace norm regularization
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- Superluminal tunneling of a relativistic half-integer spin particle through a potential barrier
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- Neutrosophic triplet normed space
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- Lie algebraic discussion for affinity based information diffusion in social networks
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- Radiation dose and cancer risk estimates in helical CT for pulmonary tuberculosis infections
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- A comparison study of steady-state vibrations with single fractional-order and distributed-order derivatives
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- Some new remarks on MHD Jeffery-Hamel fluid flow problem
- Regular Articles
- Numerical investigation of magnetohydrodynamic slip flow of power-law nanofluid with temperature dependent viscosity and thermal conductivity over a permeable surface
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- Charge conservation in a gravitational field in the scalar ether theory
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- Measurement problem and local hidden variables with entangled photons
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- Compression of hyper-spectral images using an accelerated nonnegative tensor decomposition
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- Fabrication and application of coaxial polyvinyl alcohol/chitosan nanofiber membranes
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- Calculating degree-based topological indices of dominating David derived networks
- Regular Articles
- The structure and conductivity of polyelectrolyte based on MEH-PPV and potassium iodide (KI) for dye-sensitized solar cells
- Regular Articles
- Chiral symmetry restoration and the critical end point in QCD
- Regular Articles
- Numerical solution for fractional Bratu’s initial value problem
- Regular Articles
- Structure and optical properties of TiO2 thin films deposited by ALD method
- Regular Articles
- Quadruple multi-wavelength conversion for access network scalability based on cross-phase modulation in an SOA-MZI
- Regular Articles
- Application of ANNs approach for wave-like and heat-like equations
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Study on node importance evaluation of the high-speed passenger traffic complex network based on the Structural Hole Theory
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A mathematical/physics model to measure the role of information and communication technology in some economies: the Chinese case
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Numerical modeling of the thermoelectric cooler with a complementary equation for heat circulation in air gaps
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- On the libration collinear points in the restricted three – body problem
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Research on Critical Nodes Algorithm in Social Complex Networks
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A simulation based research on chance constrained programming in robust facility location problem
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A mathematical/physics carbon emission reduction strategy for building supply chain network based on carbon tax policy
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Mathematical analysis of the impact mechanism of information platform on agro-product supply chain and agro-product competitiveness
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A real negative selection algorithm with evolutionary preference for anomaly detection
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A privacy-preserving parallel and homomorphic encryption scheme
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Random walk-based similarity measure method for patterns in complex object
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A Mathematical Study of Accessibility and Cohesion Degree in a High-Speed Rail Station Connected to an Urban Bus Transport Network
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Design and Simulation of the Integrated Navigation System based on Extended Kalman Filter
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Oil exploration oriented multi-sensor image fusion algorithm
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Analysis of Product Distribution Strategy in Digital Publishing Industry Based on Game-Theory
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Expanded Study on the accumulation effect of tourism under the constraint of structure
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Unstructured P2P Network Load Balance Strategy Based on Multilevel Partitioning of Hypergraph
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Research on the method of information system risk state estimation based on clustering particle filter
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Demand forecasting and information platform in tourism
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Physical-chemical properties studying of molecular structures via topological index calculating
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Local kernel nonparametric discriminant analysis for adaptive extraction of complex structures
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- City traffic flow breakdown prediction based on fuzzy rough set
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Conservation laws for a strongly damped wave equation
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Blending type approximation by Stancu-Kantorovich operators based on Pólya-Eggenberger distribution
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Computing the Ediz eccentric connectivity index of discrete dynamic structures
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A discrete epidemic model for bovine Babesiosis disease and tick populations
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Study on maintaining formations during satellite formation flying based on SDRE and LQR
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Relationship between solitary pulmonary nodule lung cancer and CT image features based on gradual clustering
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- A novel fast target tracking method for UAV aerial image
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Fuzzy comprehensive evaluation model of interuniversity collaborative learning based on network
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Conservation laws, classical symmetries and exact solutions of the generalized KdV-Burgers-Kuramoto equation
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- After notes on self-similarity exponent for fractal structures
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Excitation probability and effective temperature in the stationary regime of conductivity for Coulomb Glasses
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Comparisons of feature extraction algorithm based on unmanned aerial vehicle image
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Research on identification method of heavy vehicle rollover based on hidden Markov model
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Classifying BCI signals from novice users with extreme learning machine
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Topics on data transmission problem in software definition network
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Statistical inferences with jointly type-II censored samples from two Pareto distributions
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Estimation for coefficient of variation of an extension of the exponential distribution under type-II censoring scheme
- Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
- Analysis on trust influencing factors and trust model from multiple perspectives of online Auction
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Coupling of two-phase flow in fractured-vuggy reservoir with filling medium
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Production decline type curves analysis of a finite conductivity fractured well in coalbed methane reservoirs
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Flow Characteristic and Heat Transfer for Non-Newtonian Nanofluid in Rectangular Microchannels with Teardrop Dimples/Protrusions
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- The size prediction of potential inclusions embedded in the sub-surface of fused silica by damage morphology
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Research on carbonate reservoir interwell connectivity based on a modified diffusivity filter model
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- The method of the spatial locating of macroscopic throats based-on the inversion of dynamic interwell connectivity
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Unsteady mixed convection flow through a permeable stretching flat surface with partial slip effects through MHD nanofluid using spectral relaxation method
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- A volumetric ablation model of EPDM considering complex physicochemical process in porous structure of char layer
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Numerical simulation on ferrofluid flow in fractured porous media based on discrete-fracture model
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Macroscopic lattice Boltzmann model for heat and moisture transfer process with phase transformation in unsaturated porous media during freezing process
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Modelling of intermittent microwave convective drying: parameter sensitivity
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Simulating gas-water relative permeabilities for nanoscale porous media with interfacial effects
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Simulation of counter-current imbibition in water-wet fractured reservoirs based on discrete-fracture model
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Investigation effect of wettability and heterogeneity in water flooding and on microscopic residual oil distribution in tight sandstone cores with NMR technique
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Special Issue: Ever New "Loopholes" in Bell’s Argument and Experimental Tests
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Erratum to: The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Rhetoric, logic, and experiment in the quantum nonlocality debate
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- What If Quantum Theory Violates All Mathematics?
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Relativity, anomalies and objectivity loophole in recent tests of local realism
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- The photon identification loophole in EPRB experiments: computer models with single-wing selection
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Bohr against Bell: complementarity versus nonlocality
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Is Einsteinian no-signalling violated in Bell tests?
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Bell’s “Theorem”: loopholes vs. conceptual flaws
- Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
- Nonrecurrence and Bell-like inequalities
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Three-dimensional computer models of electrospinning systems
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Electric field computation and measurements in the electroporation of inhomogeneous samples
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Modelling of magnetostriction of transformer magnetic core for vibration analysis
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Comparison of the fractional power motor with cores made of various magnetic materials
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Dynamics of the line-start reluctance motor with rotor made of SMC material
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Inhomogeneous dielectrics: conformal mapping and finite-element models
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Topology optimization of induction heating model using sequential linear programming based on move limit with adaptive relaxation
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Detection of inter-turn short-circuit at start-up of induction machine based on torque analysis
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Current superimposition variable flux reluctance motor with 8 salient poles
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Modelling axial vibration in windings of power transformers
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Field analysis & eddy current losses calculation in five-phase tubular actuator
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Hybrid excited claw pole generator with skewed and non-skewed permanent magnets
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Electromagnetic phenomena analysis in brushless DC motor with speed control using PWM method
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Field-circuit analysis and measurements of a single-phase self-excited induction generator
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- A comparative analysis between classical and modified approach of description of the electrical machine windings by means of T0 method
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Field-based optimal-design of an electric motor: a new sensitivity formulation
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Application of the parametric proper generalized decomposition to the frequency-dependent calculation of the impedance of an AC line with rectangular conductors
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Virtual reality as a new trend in mechanical and electrical engineering education
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Holonomicity analysis of electromechanical systems
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- An accurate reactive power control study in virtual flux droop control
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Localized probability of improvement for kriging based multi-objective optimization
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Research of influence of open-winding faults on properties of brushless permanent magnets motor
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Optimal design of the rotor geometry of line-start permanent magnet synchronous motor using the bat algorithm
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Model of depositing layer on cylindrical surface produced by induction-assisted laser cladding process
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Detection of inter-turn faults in transformer winding using the capacitor discharge method
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- A novel hybrid genetic algorithm for optimal design of IPM machines for electric vehicle
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Lamination effects on a 3D model of the magnetic core of power transformers
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Detection of vertical disparity in three-dimensional visualizations
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Calculations of magnetic field in dynamo sheets taking into account their texture
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- 3-dimensional computer model of electrospinning multicapillary unit used for electrostatic field analysis
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Optimization of wearable microwave antenna with simplified electromagnetic model of the human body
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Induction heating process of ferromagnetic filled carbon nanotubes based on 3-D model
- Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
- Speed control of an induction motor by 6-switched 3-level inverter