scholarly journals Quantum mechanism of condensation and high Tc superconductivity

2019 ◽  
Vol 33 (14) ◽  
pp. 1950139
Author(s):  
Tian Ma ◽  
Shouhong Wang
Keyword(s):  
Statistical Physics ◽  
Quantum Physics ◽  
Average Energy ◽  
Physics First ◽  
Electron Pairs ◽  
High Tc ◽  
Quantum Mechanism ◽  
Recent Developments ◽  
The Common ◽  
New Interpretation

The main objective of this paper is to introduce a new quantum mechanism of condensates and superconductivity based on a new interpretation of quantum mechanical wavefunctions, and on recent developments in quantum physics and statistical physics. First, we postulate that the wavefunction [Formula: see text]e[Formula: see text] is the common wavefunction for all particles in the same class determined by the external potential V(x), [Formula: see text](x)[Formula: see text] represents the distribution density of the particles, and [Formula: see text] is the velocity field of the particles. Although the new interpretation does not alter the basic theories of quantum mechanics, it is an entirely different interpretation from the classical Bohr interpretation, removes all absurdities and offers new insights for quantum physics and for condensed matter physics. Second, we show that the key for condensation of bosonic particles is that their interaction is sufficiently weak to ensure that a large collection of boson particles are in a state governed by the same condensation wavefunction field [Formula: see text] under the same bounding potential V. For superconductivity, the formation of superconductivity comes down to conditions for the formation of electron pairs, and for the electron pairs to share a common wavefunction. Thanks to the recently developed principle of interaction dynamics (PID) interaction potential of electrons and the average-energy level formula of temperature, these conditions for superconductivity are explicitly derived. Furthermore, we obtain both microscopic and macroscopic formulas for the critical temperature. The field and topological phase transition equations for condensates are also derived.

Theory and Method and the Stakes of a Fragmented Discipline: Or, What Economics Taught Me About the Study of Religion

2020 ◽  
Author(s):  
Thomas A Lewis
Keyword(s):  
Religious Studies ◽  
The Public ◽  
Global Pandemic ◽  
Recent Developments ◽  
The Common ◽  
The Impact ◽  
Academic Study

Abstract As a discipline, the academic study of religion is strikingly fragmented, with little engagement or shared criteria of excellence across subfields. Although important recent developments have expanded the traditions and peoples studied as well as the methods used, the current extent of fragmentation limits the impact of this diversification and pluralization. At a moment when the global pandemic is catalyzing profound pressures on our universities and disciplines, this fragmentation makes it difficult to articulate to the public, to non-religious studies colleagues, and to students why the study of religion matters. We therefore too often fall back on platitudes. I argue for a revitalized methods and theories conversation that connects us even as it bears our arguments and disagreements about what we do and how. Courses in methods and theories in the study of religion represent the most viable basis we have for bringing the academic study of religion into the common conversation or argument that constitutes a discipline without sacrificing our pluralism.

Relative Reactivity Trends OP High Temperature Superconductor Phases

1992 ◽  
Vol 275 ◽  
Author(s):  
David R. Riley ◽  
Ji-Ping Zhou ◽  
A. Manthiram ◽  
John T. McDevitt
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
Relative Reactivity ◽  
Complete Understanding ◽  
High Tc ◽  
X Ray ◽  
The Common ◽  
Scanning Electron

ABSTRACTMany of the high temperature superconductor phases degrade rapidly when in the presence of water, acids, carbon dioxide or carbon monoxide. In order to foster more rapid developments in the area of high-Tc research, it will be necessary to acquire a more complete understanding of the surface chemistry of these superconducting materials. In this paper, the relative reactivity of the common cuprate phases toward water is reported. X-ray powder diffraction and scanning electron microscopy measurements are utilized here to establish the reactivity trends.

“Unity in Diversity” Reloaded: The European Court of Human Rights’ Turn to Subsidiarity and its Consequences

2021 ◽  
Vol 15 (1) ◽  
pp. 93-123
Author(s):  
Mikael Rask Madsen
Keyword(s):  
Human Rights ◽  
European Convention ◽  
Reform Process ◽  
Individual Member ◽  
Member States ◽  
European Court ◽  
Recent Developments ◽  
Unity In Diversity ◽  
The Common ◽  
Individual Justice

Abstract The European Convention of Human Rights system was originally created to sound the alarm if democracy was threatened in the member states. Yet, it eventually developed into a very different system with a focus on providing individual justice in an ever growing number of member states. This transformation has raised fundamental questions as to the level of difference and diversity allowed within the common European human rights space. Was the system to rest on minimum standards with room for domestic differences, or was it to create uniform standards? These questions have come up as increasingly contentious issues over the past years and have triggered a number of reforms seeking to introduce more subsidiarity in the system, striking a different balance between the European and national oversight of human rights. The article analyses this turn to subsidiarity by exploring whether the reform process has introduced new forms of difference and diversity within the common space of European human rights. Covering the period from 2000 to the end of 2019 and using a dataset of all judgments of the period, the article provides a structural analysis of developments in reference to the margin of appreciation which is the European Court of Human Rights’ long-standing tool for balancing the common standards, yet leaving space for individual member states to find local solutions to implementing those standards. It concludes that recent developments have contributed to a more federal-style construction of European human rights with more space for differences within the common general standards.

scholarly journals Understanding axial progenitor biology in vivo and in vitro

Development ◽  
2021 ◽  
Vol 148 (4) ◽  
pp. dev180612
Author(s):  
Filip J. Wymeersch ◽  
Valerie Wilson ◽  
Anestis Tsakiridis
Keyword(s):  
Spinal Cord ◽  
Vertebral Column ◽  
Cell Types ◽  
Disease Modelling ◽  
Recent Developments ◽  
The Common ◽  
Key Features ◽  
Trunk Musculature

ABSTRACTThe generation of the components that make up the embryonic body axis, such as the spinal cord and vertebral column, takes place in an anterior-to-posterior (head-to-tail) direction. This process is driven by the coordinated production of various cell types from a pool of posteriorly-located axial progenitors. Here, we review the key features of this process and the biology of axial progenitors, including neuromesodermal progenitors, the common precursors of the spinal cord and trunk musculature. We discuss recent developments in the in vitro production of axial progenitors and their potential implications in disease modelling and regenerative medicine.

Time-asymmetric fluctuations in the atmosphere: daily mean temperatures and total-column ozone

2010 ◽  
Vol 368 (1933) ◽  
pp. 5721-5735 ◽  
Author(s):  
Péter Kiss ◽  
Imre M. Jánosi
Keyword(s):  
Statistical Physics ◽  
Dissipative Systems ◽  
Total Column Ozone ◽  
Recent Developments ◽  
Significant Step ◽  
Simple Step ◽  
Temperature Records ◽  
Breaking Time ◽  
Column Ozone ◽  
Total Column

Fluctuations breaking time-reversal symmetry are common attributes of dissipative systems operating far from equilibrium. Recent developments in non-equilibrium statistical physics represent a significant step towards an understanding of how time-reversible microscopic laws can yield to inherent irreversibility on meso- or macroscopic scales. Most of the theoretical conclusions consider quantities (e.g. entropy production) that are difficult to obtain with an appropriate accuracy in real systems. Probably less-complicated measures, such as the simple step-number ratio used in this work, can also help to characterize time-asymmetric fluctuations. In the first part, we give a short summary of recent results on asymmetric daily mean temperature changes. The second part discusses total-column ozone fluctuations, where statistically significant asymmetries are also detected. A detailed correlation analysis of ozone signals and high-altitude temperature records supports the strong coupling between tropospheric dynamics and stratospheric processes on synoptic time scales.

scholarly journals Beyond switches: Rotaxane- and catenane-based synthetic molecular motors

2008 ◽  
Vol 80 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Euan R. Kay ◽  
David A. Leigh
Keyword(s):  
Molecular Motors ◽  
Physical Science ◽  
Statistical Physics ◽  
Biological Process ◽  
Molecular Level ◽  
Molecular Machines ◽  
Interlocked Molecules ◽  
Recent Developments ◽  
New Generation ◽  
First Time

Nature uses molecular motors and machines in virtually every significant biological process, but learning how to design and assemble simpler artificial structures that function through controlled molecular-level motion is a major challenge for contemporary physical science. The established engineering principles of the macroscopic world can offer little more than inspiration to the molecular engineer who creates devices for an environment where everything is constantly moving and being buffeted by other atoms and molecules. Rather, experimental designs for working molecular machines must follow principles derived from chemical kinetics, thermodynamics, and nonequilibrium statistical physics. The remarkable characteristics of interlocked molecules make them particularly useful for investigating the control of motion at the molecular level. Yet, the vast majority of synthetic molecular machines studied to date are simple two-state switches. Here we outline recent developments from our laboratory that demonstrate more complex molecular machine functions. This new generation of synthetic molecular machines can move continuously and progressively away from equilibrium, and they may be considered true prototypical molecular motors. The examples discussed exemplify two, fundamentally different, "Brownian ratchet" mechanisms previously developed in theoretical statistical physics and realized experimentally in molecular-level devices for the first time in these systems.

Child Rights and the Movement from Status to Agency: Human Rights and the Removal of the Legal Disabilities of Vulnerability

2015 ◽  
Vol 84 (2) ◽  
pp. 183-220
Author(s):  
Sevda Clark
Keyword(s):  
Human Rights ◽  
International Law ◽  
Legal Status ◽  
Human Rights Law ◽  
Child Rights ◽  
Sociological Approach ◽  
Legal Ideology ◽  
Recent Developments ◽  
The Common ◽  
Universal Norm

Using ideology as heuristic, a legal sociological approach is employed to critically evaluate a child’s legal status and its evolution since the eighteenth century. Four principal phases are identified: (1) legal ideology of individualism in the common law tradition; (2) movement from status to contract; (3) movement from status to rights; and (4) movement from status to agency. To strengthen legal agency both status and capacity are addressed. In the fourth phase, legal status has evolved in ways capable of facilitating children’s legal agency; it has evolved from being static to being dynamic, and is now determined by reference to public international law, rather than territorially. This article advances a universal norm of legal capacity to sue for violations of human rights, which is derived from the recent developments in human rights law. In the evolution of children’s rights we are presently witnessing the movement from status to agency.

Quantum Information

MRS Bulletin ◽  
2005 ◽  
Vol 30 (2) ◽  
pp. 99-104 ◽  
Author(s):  
Luiz Davidovich
Keyword(s):  
Quantum Information ◽  
San Francisco ◽  
Quantum Physics ◽  
Quantum Algorithms ◽  
Rapid Development ◽  
Superposition Principle ◽  
Deep Understanding ◽  
Single Atom ◽  
Recent Developments ◽  
Fundamental Research

AbstractThe following article is based on the plenary address by Luiz Davidovich (Federal University of Rio de Janeiro), presented on April 14, 2004, at the 2004 MRS Spring Meeting in San Francisco. The field of quantum information is a discipline that aims to investigate methods for characterizing, transmitting, storing, compressing, and computationally utilizing the information carried by quantum states. It owes its rapid development over the last few years to several factors: the ability, developed in several laboratories, to control and measure simple microscopic systems; the discovery of fast quantum algorithms; and the recognition that Moore's law will soon lead to the single-atom limit of elementary computing gates.Cryptography and quantum computing are among the main applications in the field.They rely on the subtle and fundamental properties of the quantum world: the unavoidable disturbance associated with measurement, the superposition principle, and the nonlocal properties of entangled states. Progress in this area is intimately connected to a deep understanding of quantum physics: recent achievements include the experimental demonstration of teleportation and detailed investigations of the role of the environment in the quantum–classical transition. This article reviews basic concepts and recent developments in the field of quantum information, emphasizing the close ties between fundamental research and possible applications.

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