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"CONSTITUENT"
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Constituent power and constitutional order : above, within and beside the Constitution
\"The constituent power of the people is one of the fundamental ideas of modern politics. It was first articulated during the early modern revolutions when the idea was deployed to legitimize the revolution and to develop constitutions. This study sketches the historical background and the articulation of the idea of constituent power of the people, using the threefold meaning of the idea initially suggested by Carl Schmitt: constituent power being power above the existing constitutional order, power within that order, and power beside the constitutional order. These conceptions are not only discussed in the historical context they were articulated in but also placed within the framework of contemporary political and constitutional thought. In doing so, this book explores the various emphasizes that different theorists place on the role of constituent power in democracies to provide a comprehensive understanding of how this cornerstone of political thought has evolved since it was first posited in the 18th Century.\"--Publisher's website.
Book
Searching for the constituents of the atom
This is a short account of the research that established the electron, proton and neutron as the basic constituents of atoms. It is written from the point of view of a physicist rather than a historian and tries to explain the scientific pathways to establishing these atomic constituents.
Journal Article
Interfacial ferroelectricity in rhombohedral-stacked bilayer transition metal dichalcogenides
van der Waals materials have greatly expanded our design space of heterostructures by allowing individual layers to be stacked at non-equilibrium configurations, for example via control of the twist angle. Such heterostructures not only combine characteristics of the individual building blocks, but can also exhibit physical properties absent in the parent compounds through interlayer interactions
1
. Here we report on a new family of nanometre-thick, two-dimensional (2D) ferroelectric semiconductors, where the individual constituents are well-studied non-ferroelectric monolayer transition metal dichalcogenides (TMDs), namely WSe
2
, MoSe
2
, WS
2
and MoS
2
. By stacking two identical monolayer TMDs in parallel, we obtain electrically switchable rhombohedral-stacking configurations, with out-of-plane polarization that is flipped by in-plane sliding motion. Fabricating nearly parallel-stacked bilayers enables the visualization of moiré ferroelectric domains as well as electric field-induced domain wall motion with piezoelectric force microscopy. Furthermore, by using a nearby graphene electronic sensor in a ferroelectric field transistor geometry, we quantify the ferroelectric built-in interlayer potential, in good agreement with first-principles calculations. The new semiconducting ferroelectric properties of these four new TMDs opens up the possibility of studying the interplay between ferroelectricity and their rich electric and optical properties
2
–
5
.
Rhombohedral stacking of two identical non-ferroelectric monolayer transition metal dichalcogenides enables the observation of interfacial ferroelectricity.
Journal Article
Organically linked iron oxide nanoparticle supercrystals with exceptional isotropic mechanical properties
Crystals of spherical iron oxide nanoparticles linked by oleic acid ligands show exceptional bending modulus, hardness and strength.
It is commonly accepted that the combination of the anisotropic shape and nanoscale dimensions of the mineral constituents of natural biological composites underlies their superior mechanical properties when compared to those of their rather weak mineral and organic constituents
1
. Here, we show that the self-assembly of nearly spherical iron oxide nanoparticles in supercrystals linked together by a thermally induced crosslinking reaction of oleic acid molecules leads to a nanocomposite with exceptional bending modulus of 114 GPa, hardness of up to 4 GPa and strength of up to 630 MPa. By using a nanomechanical model, we determined that these exceptional mechanical properties are dominated by the covalent backbone of the linked organic molecules. Because oleic acid has been broadly used as nanoparticle ligand, our crosslinking approach should be applicable to a large variety of nanoparticle systems.
Journal Article
Tetra- and Penta-Quark Structures in the Constituent Quark Model
With the development of high energy physics experiments, a large amount of exotic states in the hadronic sector have been observed. In order to shed some light on the nature of the tetraquark and pentaquark candidates, a constituent quark model, along with the Gaussian expansion method, has been employed systematically in real- and complex-range investigations. We review herein the double- and fully-heavy tetraquarks, but also the hidden-charm, hidden-bottom and doubly charmed pentaquarks. Several exotic hadrons observed experimentally were well reproduced within our approach; moreover, their possible compositeness and other properties, such as their decay widths and general patterns in the spectrum, are analyzed. Besides, we report also some theoretical predictions of tetra- and penta-quark states which have not seen by experiment yet.
Journal Article
Politics with the people : building a directly representative democracy
\"Many citizens in the US and abroad fear that democratic institutions have become weak, and continue to weaken. Politics with the People develops the principles and practice of 'directly representative democracy' - a new way of connecting citizens and elected officials to improve representative government. Sitting members of Congress agreed to meet with groups of their constituents via online, deliberative town hall meetings to discuss some of the most important and controversial issues of the day. The results from these experiments reveal a model of how our democracy could work, where politicians consult with and inform citizens in substantive discussions, and where otherwise marginalized citizens participate and are empowered. Moving beyond our broken system of interest group politics and partisan bloodsport, directly representative reforms will help restore citizens' faith in the institutions of democratic self-government, precisely at a time when those institutions themselves feel dysfunctional and endangered\"-- Provided by publisher.
Book
Search for baryon junctions in e+A collisions at the electron ion collider
Constituent quarks in a nucleon are the essential elements in the standard “quark model” associated with the electric charge, spin, mass, and baryon number of a nucleon. Quantum chromodynamics (QCD) describes nucleon as a composite object containing current quarks (valence quarks and sea (anti-)quarks) and gluons. These subatomic elements and their interactions are known to contribute in complex ways to the overall nucleon spin and mass. In the early development of QCD theory in the 1970s, an alternative hypothesis postulated that the baryon number might manifest itself through a non-perturbative configuration of gluon fields forming a Y-shaped topology known as the gluon junction. In this work, we propose to test such hypothesis by measuring (i) the Regge intercept of the net-baryon distributions for e+(p)Au collisions, (ii) baryon and charge transport in the isobaric ratio between e+Ru and e+Zr collisions, and (iii) target flavor dependence of proton and antiproton yields at large rapidity, transported from the hydrogen and deuterium targets in e + p(d) collisions. Our study indicates that these measurements at the EIC can help determine what carries the baryon number.
Journal Article