The role of dissipation in macroscopic quantum tunneling and in near-field propagation

2019 ◽  
Vol 33 (11) ◽  
pp. 1950131
Author(s):  
A. Ranfagni ◽  
G. P. Pazzi ◽  
I. Cacciari
Keyword(s):  
Quantum Tunneling ◽  
Wave Attenuation ◽  
Near Field ◽  
Superconducting Devices ◽  
Transition Elements ◽  
Microwave Propagation ◽  
Dissipative Effects ◽  
Alternative Approach ◽  
Macroscopic Quantum Tunneling

A stochastic model, which demonstrated to be capable of determining dissipative effects in the microwave circuits loading superconducting devices, is found to be suitable also for analyzing near-field microwave propagation when the wave attenuation is interpreted as a dissipative effect. An alternative approach to the problem is offered by Feynman’s transition elements.

Macroscopic quantum tunneling: a transition-elements analysis of traversal time

2003 ◽  
Vol 316 (6) ◽  
pp. 351-356 ◽  
Author(s):  
A Agresti ◽  
C Ranfagni ◽  
P Sandri ◽  
A Ranfagni ◽  
R Ruggeri
Keyword(s):  
Quantum Tunneling ◽  
Transition Elements ◽  
Macroscopic Quantum ◽  
Traversal Time ◽  
Macroscopic Quantum Tunneling

Macroscopic quantum tunneling of charge density waves

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-161-Pr10-163
Author(s):  
H. Matsukawa ◽  
H. Miyake ◽  
M. Yumoto ◽  
H. Fukuyama
Keyword(s):  
Charge Density ◽  
Quantum Tunneling ◽  
Charge Density Waves ◽  
Density Waves ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Tunneling

scholarly journals Robust Universal Inference

Entropy ◽  
2021 ◽  
Vol 23 (6) ◽  
pp. 773
Author(s):  
Amichai Painsky ◽  
Meir Feder
Keyword(s):  
Robust Estimation ◽  
Minimax Estimator ◽  
Worst Case ◽  
Capacity Theory ◽  
Alternative Approach ◽  
True Model ◽  
Finite Set ◽  
Universal Prediction ◽  
Estimation Scheme

Learning and making inference from a finite set of samples are among the fundamental problems in science. In most popular applications, the paradigmatic approach is to seek a model that best explains the data. This approach has many desirable properties when the number of samples is large. However, in many practical setups, data acquisition is costly and only a limited number of samples is available. In this work, we study an alternative approach for this challenging setup. Our framework suggests that the role of the train-set is not to provide a single estimated model, which may be inaccurate due to the limited number of samples. Instead, we define a class of “reasonable” models. Then, the worst-case performance in the class is controlled by a minimax estimator with respect to it. Further, we introduce a robust estimation scheme that provides minimax guarantees, also for the case where the true model is not a member of the model class. Our results draw important connections to universal prediction, the redundancy-capacity theorem, and channel capacity theory. We demonstrate our suggested scheme in different setups, showing a significant improvement in worst-case performance over currently known alternatives.

scholarly journals Chemical and Biological Molecules Involved in Differentiation, Maturation, and Survival of Dopaminergic Neurons in Health and Parkinson’s Disease: Physiological Aspects and Clinical Implications

Biomedicines ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 754
Author(s):  
Giulia Gaggi ◽  
Andrea Di Credico ◽  
Pascal Izzicupo ◽  
Giovanni Iannetti ◽  
Angela Di Baldassarre ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Dopaminergic Neurons ◽  
Potential Role ◽  
High Efficiency ◽  
Biological Molecules ◽  
Alternative Approach ◽  
Non Coding Rnas ◽  
Set Up

Parkinson’s disease (PD) is one of the most common neurodegenerative disease characterized by a specific and progressive loss of dopaminergic (DA) neurons and dopamine, causing motor dysfunctions and impaired movements. Unfortunately, available therapies can partially treat the motor symptoms, but they have no effect on non-motor features. In addition, the therapeutic effect reduces gradually, and the prolonged use of drugs leads to a significative increase in the number of adverse events. For these reasons, an alternative approach that allows the replacement or the improved survival of DA neurons is very appealing for the treatment of PD patients and recently the first human clinical trials for DA neurons replacement have been set up. Here, we review the role of chemical and biological molecules that are involved in the development, survival and differentiation of DA neurons. In particular, we review the chemical small molecules used to differentiate different type of stem cells into DA neurons with high efficiency; the role of microRNAs and long non-coding RNAs both in DA neurons development/survival as far as in the pathogenesis of PD; and, finally, we dissect the potential role of exosomes carrying biological molecules as treatment of PD.

Theory of macroscopic quantum tunneling in Nb/Au/YBCO Josephson junctions

2007 ◽  
Vol 463-465 ◽  
pp. 80-83 ◽  
Author(s):  
S. Kawabata ◽  
A.A. Golubov ◽  
Ariando ◽  
C.J.M. Verwijs ◽  
H. Hilgenkamp
Keyword(s):  
Quantum Tunneling ◽  
Josephson Junctions ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Tunneling

scholarly journals “Incompleteness” and the Quest for Multiple Identities in South Africa

2015 ◽  
Vol 50 (3) ◽  
pp. 81-107 ◽  
Author(s):  
Bernard C. Lategan
Keyword(s):  
South Africa ◽  
Cultural Diversity ◽  
Identity Formation ◽  
Social Cohesion ◽  
Historical Memory ◽  
Multiple Identities ◽  
The Self ◽  
Important Goal ◽  
Alternative Approach

The article explores the contours of multiple identities in contrast to singular identities in situations of social complexity and cultural diversity. Nyamnjoh's concepts of “incompleteness” and “frontier Africans” imply an alternative approach to identity formation. Although the formation of one's own, singular identity is a necessary stage in the development of each individual, it has specific limitations. This is especially true in situations of complexity and diversity and where the achievement of social cohesion is an important goal. With reference to existing theories of identity formation, an alternative framework is proposed that is more appropriate for the dynamic, open-ended nature of identity and better suited to encourage the enrichment of identity. The role of imagination, a strategy for crossing borders (with reference to Clingman's concept of a “grammar of identity”), the search for commonality, and the effect of historical memory are discussed. Enriched and multiple identities are not achieved by replacement or exchange, but by widening (existing) singular identities into a more inclusive and diverse understanding of the self.

Sign in / Sign up

Export Citation Format

Share Document