scholarly journals New developments in reaction theory: preparing for the FRIB era

2018 ◽  
Vol 178 ◽  
pp. 03001 ◽  
Author(s):  
F.M. Nunes ◽  
P.C. Capel ◽  
Ch. Elster ◽  
L. Hlophe ◽  
Jin Lei ◽  
...  
Keyword(s):  
Heavy Nuclei ◽  
Core Excitation ◽  
Faddeev Equations ◽  
New Developments ◽  
The Status ◽  
Recent Developments ◽  
Reaction Theory ◽  
R Process ◽  
The Continuum

This is a brief report on the progress made towards an exact theory for (d,p) on heavy nuclei, which is important to determine neutron capture rates for r-process nuclei. We first discuss the role of core excitation in the framework of Faddeev equations. Following that, we provide the status of the Faddeev theory being developed in the Coulomb basis with separable interactions. We then present some recent developments on nonlocal nucleon optical potentials. Finally, the progress on the theory transfer to the continuum is summarized.

scholarly journals The State of Matter in Simulations of Core-Collapse supernovae—Reflections and Recent Developments

2017 ◽  
Vol 34 ◽  
Author(s):  
Tobias Fischer ◽  
Niels-Uwe Bastian ◽  
David Blaschke ◽  
Mateusz Cierniak ◽  
Matthias Hempel ◽  
...  
Keyword(s):  
Equation Of State ◽  
Degrees Of Freedom ◽  
The State ◽  
Core Collapse ◽  
Heavy Nuclei ◽  
Isospin Asymmetry ◽  
Wide Range ◽  
Recent Developments ◽  
State Of Matter

AbstractIn this review article, we discuss selected developments regarding the role of the equation of state in simulations of core-collapse supernovae. There are no first-principle calculations of the state of matter under supernova conditions since a wide range of conditions is covered, in terms of density, temperature, and isospin asymmetry. Instead, model equation of state are commonly employed in supernova studies. These can be divided into regimes with intrinsically different degrees of freedom: heavy nuclei at low temperatures, inhomogeneous nuclear matter where light and heavy nuclei coexist together with unbound nucleons, and the transition to homogeneous matter at high densities and temperatures. In this article, we discuss each of these phases with particular view on their role in supernova simulations.

A REVIEW OF r-PROCESS NUCLEOSYNTHESIS IN THE COLLAPSAR JET

2013 ◽  
Vol 22 (10) ◽  
pp. 1330022 ◽  
Author(s):  
KO NAKAMURA ◽  
TOSHITAKA KAJINO ◽  
GRANT J. MATHEWS ◽  
SUSUMU SATO ◽  
SEIJI HARIKAE
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Gamma Ray ◽  
Reaction Network ◽  
Late Time ◽  
Heavy Nuclei ◽  
Long Duration ◽  
Test Particles ◽  
The Status ◽  
R Process

The collapsar scenario for long-duration gamma ray bursts (GRBs) has been proposed as a possible astrophysical site for r-process nucleosynthesis. We summarize the status of r-process nucleosynthesis calculations of our group and others in the context of a magnetohydrodynamics + neutrino-heated collapsar model. In the simulations of our group, we begin with a relativistic magnetohydrodynamic model including ray-tracing neutrino transport to describe the development of the black hole accretion disk and the neutrino heating of the funnel region above the black hole. The late-time evolution of the associated jet was then followed using axisymmetric special relativistic hydrodynamics. We utilized representative test particles to follow the temperature, entropy, electron fraction and density for material flowing within the jet from ejection from the accretion disk until several thousand kilometer above the black hole as temperatures fall from 9×109 to 3×108 K. The evolution of nuclear abundances from nucleons to heavy nuclei for ejected test particle trajectories has been solved in a large nuclear reaction network. It was found that an r-process-like abundance distribution forms in material ejected in the collapsar jet.

From the Quarrel of Monotheism to the Babel–Bibel Controversy

2021 ◽  
pp. 167-190
Author(s):  
Guy G. Stroumsa
Keyword(s):  
Nineteenth Century ◽  
Significant Role ◽  
Turn Of The Century ◽  
New Developments ◽  
Anti Semitism ◽  
International Impact ◽  
The Status ◽  
Political Borders

The chapter ponders the massive international impact of Renan’s views on Semitic monotheism. This impact, spread across linguistic, religious, and political borders, enduringly echoed the idea of Semitic monotheism. At the same time, it triggered a series of polemical responses that questioned the very legitimacy of the idea. The chapter also reviews new developments among German historians of religion in the last decades of the nineteenth century on the approach of biblical monotheism. In particular, we focus on another major scholarly affair, which took place at turn of the century, around a scholarly school that sought to discredit the idea of the Israelite origins of monotheism. These developments must be understood in the context of the growing racial anti-Semitism. The significant role of Jewish scholars in both affairs, in which the status of ancient Israelite monotheism was questioned, will also be surveyed.

scholarly journals The perfect prosodic word in Danish

2015 ◽  
Vol 38 (1) ◽  
pp. 5-36 ◽  
Author(s):  
Junko Ito ◽  
Armin Mester
Keyword(s):  
Optimality Theory ◽  
Essential Role ◽  
Constituent Structure ◽  
Prosodic Word ◽  
Its Analysis ◽  
The Status ◽  
Recent Developments ◽  
Presence And Absence ◽  
Match Theory

The Danishstød, a kind of glottal prosody associated with certain syllables, as inbarʔn‘child’ (cf. stødlessbarnlig‘childish’), has long been the target of intense phonological investigation. In this paper, we show that its analysis requires an understanding of the prosodic constituent structure of Danish, and of the essential role of theperfect prosodic word(coextensive with one foot). After motivating this notion on independent grounds, both in other languages and in the context of acquisition, we show that the Danish stød system, analyzed in Optimality Theory, provides a window on the workings of the perfect prosodic word, regulating the presence and absence of stød in some of the much-discussed cases in the literature. In conclusion, we discuss the status of the perfect prosodic word in the light of recent developments in phonological theory, such as Match Theory.

Continuum Modeling for Repetitive Lattice Structures

1988 ◽  
Vol 41 (7) ◽  
pp. 285-296 ◽  
Author(s):  
Ahmed K. Noor
Keyword(s):  
Lattice Structures ◽  
Continuum Modeling ◽  
The Matrix ◽  
The Status ◽  
Analytic Expressions ◽  
Recent Developments ◽  
Definition Of ◽  
Constitutive Matrix ◽  
The Continuum

The status and some recent developments of continuum modeling for repetitive lattice structures are summarized. Discussion focuses on a number of aspects including definition of an effective substitute continuum; characterization of the continuum model; and the different approaches for generating the properties of the continuum, namely, the constitutive matrix, the matrix of mass densities, and the matrix of thermal coefficients. Also, a simple approach is presented for generating the analytic expressions and/or numerical values of the continuum properties. Sample numerical results are presented to demonstrate the effectiveness of the continuum modeling approach. Future directions of research on continuum modeling are identified. These include needed extensions and applications of continuum modeling as well as computational strategies and modeling techniques.

Monads, Composition, and Force

2018 ◽  
Author(s):  
Richard T. W. Arthur
Keyword(s):  
Passive Force ◽  
Continuous Creation ◽  
Starting Point ◽  
Original Contribution ◽  
The Status ◽  
The Continuum ◽  
Scholastic Tradition

This book offers a fresh interpretation of Leibniz’s theory of substance, taking as starting point his claims that he introduced his monads to solve the problem of the composition of the continuum. It is argued that they can only perform this function if they are understood as requisites for each of the actual parts into which matter is divided, and as sources of the actions distinguishing and making actual these parts. Bodies are not composed of monads, but presuppose them for their reality; and motions are not composed of monadic states, but presuppose their tendencies to change and resist changes. This comprises an original contribution to mereology, which is given a formal rendering using Leibniz’s own logical concepts and notation. The reading is supported by a thorough analysis of the development of Leibniz’s thought, showing how his embodied monads emerge from his long dalliance with atomism, and how his doctrine of dominant and subordinate monads derives from his immersion in the scholastic tradition of the Plurality of Forms, as he seeks to preserve the role of substantial forms in enacting God’s providential plans in a way compatible with a thoroughgoing mechanism. New insight is offered into Leibniz’s construal of bodies and motions as phenomena, his simultaneous advocacy of simple and corporeal substances, his attempt to provide a theory of substantial bonds, the status of passive force in his dynamics, his endorsement of continuous creation and the discreteness of change, and the status of monadic states as momentary.

scholarly journals Constraints of the Low-x Structure of Protons and Nuclei

2020 ◽  
Vol 235 ◽  
pp. 03001
Author(s):  
Thomas Peitzmann
Keyword(s):  
Particle Production ◽  
Open Charm ◽  
The Status ◽  
Recent Developments ◽  
Electromagnetic Probes ◽  
Low X

I review recent developments in the study of the low-x partonic content of pro- tons and nuclei, with a focus on the latter, as one expects possible deviations from linear QCD evolution to be most pronounced in that case. I give examples of recent theoretical descriptions of HERA measurements with a focus on the role of BFKL evolution. I then concentrate on the status and assumptions of nuclear PDFs and the possibility to use for- ward particle production at the LHC as further constraint, in particular measurements of open charm and the potential of electromagnetic probes.

scholarly journals The European response to the COVID-19 crisis at the regional level and its effects on the shaping of the new European Cohesion Policy

2021 ◽  
Vol 7 (1) ◽  
pp. 4-17
Author(s):  
Rui Castro Vieira
Keyword(s):  
Regional Policy ◽  
Regional Level ◽  
The European Union ◽  
European Regions ◽  
Cohesion Policy ◽  
New Developments ◽  
Governance Model ◽  
Financial Framework ◽  
Recent Developments

This paper focuses on the effects of the COVID-19 pandemic and its repercussions on the EU’s Cohesion Policy. We will analyse the regional and territorial problems created by the COVID-19 crisis and the influences it had on the new developments of the Cohesion Policy. The evolution of the Cohesion Policy will be addressed, particularly the development of conditionality. The developments on the European Multiannual Financial Framework and the regional policy following the recent developments of the European response to the COVID-19 crisis and the new role of Regions will also be examined. The aim of the paper is to identify and characterise the effects of the pandemic on the European Regions and its repercussions for the development of the new Cohesion Policy and its governance model. The need for a more flexible Cohesion Policy and the opportunities afforded to the Regions and the evolution of the European Union Multilevel Governance Framework, that come from the recent developments on the proposed European Recovery Plan are also reflected

The study of interfacial reactions of nickel thin films on GaAs

1983 ◽  
Vol 41 ◽  
pp. 156-157
Author(s):  
L.J. Chen ◽  
Y.F. Hsieh
Keyword(s):  
Thin Films ◽  
Integrated Circuits ◽  
Interfacial Reactions ◽  
Metal Contacts ◽  
Nickel Thin Films ◽  
Thin Foils ◽  
The Status ◽  
Si Doped ◽  
Electron Microscopes

One measure of the maturity of a device technology is the ease and reliability of applying contact metallurgy. Compared to metal contact of silicon, the status of GaAs metallization is still at its primitive stage. With the advent of GaAs MESFET and integrated circuits, very stringent requirements were placed on their metal contacts. During the past few years, extensive researches have been conducted in the area of Au-Ge-Ni in order to lower contact resistances and improve uniformity. In this paper, we report the results of TEM study of interfacial reactions between Ni and GaAs as part of the attempt to understand the role of nickel in Au-Ge-Ni contact of GaAs.N-type, Si-doped, (001) oriented GaAs wafers, 15 mil in thickness, were grown by gradient-freeze method. Nickel thin films, 300Å in thickness, were e-gun deposited on GaAs wafers. The samples were then annealed in dry N2 in a 3-zone diffusion furnace at temperatures 200°C - 600°C for 5-180 minutes. Thin foils for TEM examinations were prepared by chemical polishing from the GaA.s side. TEM investigations were performed with JE0L- 100B and JE0L-200CX electron microscopes.

How do histone modifications contribute to transgenerational epigenetic inheritance in C. elegans?

2020 ◽  
Vol 48 (3) ◽  
pp. 1019-1034 ◽  
Author(s):  
Rachel M. Woodhouse ◽  
Alyson Ashe
Keyword(s):  
Histone Modifications ◽  
Molecular Mechanisms ◽  
Epigenetic Inheritance ◽  
Nematode Caenorhabditis Elegans ◽  
Histone Methyltransferases ◽  
Transgenerational Epigenetic Inheritance ◽  
C Elegans ◽  
Recent Developments ◽  
Gene Regulatory

Gene regulatory information can be inherited between generations in a phenomenon termed transgenerational epigenetic inheritance (TEI). While examples of TEI in many animals accumulate, the nematode Caenorhabditis elegans has proven particularly useful in investigating the underlying molecular mechanisms of this phenomenon. In C. elegans and other animals, the modification of histone proteins has emerged as a potential carrier and effector of transgenerational epigenetic information. In this review, we explore the contribution of histone modifications to TEI in C. elegans. We describe the role of repressive histone marks, histone methyltransferases, and associated chromatin factors in heritable gene silencing, and discuss recent developments and unanswered questions in how these factors integrate with other known TEI mechanisms. We also review the transgenerational effects of the manipulation of histone modifications on germline health and longevity.

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