scholarly journals Staggering of angular momentum distribution in fission

2018 ◽  
Vol 169 ◽  
pp. 00023
Author(s):  
Pierre Tamagno ◽  
Olivier Litaize
Keyword(s):  
Angular Momentum ◽  
Excitation Energy ◽  
Momentum Distribution ◽  
Ad Hoc ◽  
Rayleigh Distribution ◽  
Fission Process ◽  
Angular Momenta ◽  
Model Derivation ◽  
The Impact

We review here the role of angular momentum distributions in the fission process. To do so the algorithm implemented in the FIFRELIN code [?] is detailed with special emphasis on the place of fission fragment angular momenta. The usual Rayleigh distribution used for angular momentum distribution is presented and the related model derivation is recalled. Arguments are given to justify why this distribution should not hold for low excitation energy of the fission fragments. An alternative ad hoc expression taking into account low-lying collectiveness is presented as has been implemented in the FIFRELIN code. Yet on observables currently provided by the code, no dramatic impact has been found. To quantify the magnitude of the impact of the low-lying staggering in the angular momentum distribution, a textbook case is considered for the decay of the 144Ba nucleus with low excitation energy.

scholarly journals Microscopic analysis of homogeneous electron gas by considering dipole–dipole interaction

2017 ◽  
Vol 31 (35) ◽  
pp. 1750334 ◽  
Author(s):  
G. H. Bordbar ◽  
F. Pouresmaeeli
Keyword(s):  
Angular Momentum ◽  
Total Angular Momentum ◽  
Electron Gas ◽  
Microscopic Analysis ◽  
Dipole Interaction ◽  
Angular Momenta ◽  
State Dependent ◽  
Analytic Expressions ◽  
Quantization Formalism ◽  
The Impact

Implying perturbation theory, the impact of the dipole–dipole interaction (DDI) on the thermodynamic properties of a homogeneous electron gas at zero temperature is investigated. Through the second quantization formalism, the analytic expressions for the ground state energy and the DDI energy are obtained. In this paper, the DDI energy has similarities with the previous works done by others. We show that its general behavior depends on density and the total angular momentum. Especially, it is found that the DDI energy has a highly state-dependent behavior. With the growth of density, the magnitude of DDI energy, which is found to be the summation of all energy contributions of the states with even and odd total angular momenta, grows linearly. It is also found that for the states with even and odd total angular momenta, the DDI energy contributions are corresponding to the positive and negative values, respectively. In particular, an increase of total angular momentum leads to decline in the magnitude of energy contribution. Therefore, the dipole–dipole interaction reveals distinct characteristics in comparison with central-like interactions.

Fighting the fire: improvisational behavior during the production launch of new products

2014 ◽  
Vol 34 (6) ◽  
pp. 722-749 ◽  
Author(s):  
Uwe Gross
Keyword(s):  
Problem Solving ◽  
New Product Development ◽  
Ad Hoc ◽  
New Products ◽  
New Product ◽  
Content Type ◽  
Real World Problem ◽  
Problem Solving Behavior ◽  
The Impact

Purpose – Short-term problem solving during production launch may result in extended lead times and increased overall costs of new product development, thereby reducing the overall profitability of a new product. While the previous literature suggests formalized procedures and systematic problem solving approaches, empirical analyses indicate improvised, non-systematic, and ad hoc responses actually being used in firms’ real world problem solving processes. The purpose of this paper is to explain the role of such non-systematic approaches for the efficiency and effectiveness of problem solving processes during production launch. Design/methodology/approach – The paper empirically explores the impact of improvisational problem-solving behavior on a firm's production launch efficiency and on the success of new products. Moreover, the paper investigates the moderating role of technology familiarity, project complexity, and the number of occurring problems during production launch. Findings – The paper finds evidence for a positive curvilinear effect of improvisational problem-solving behavior on new product success and production launch efficiency. Additionally, the paper finds that improvisation is especially reasonable in complex and familiar projects or in the case of many unplanned changes during production launch. Research limitations/implications – The study provides evidence for the relevance of routinized and improvisational behavior during production launch. Practical implications – Improvisational behavior decreases the performance of the production launch and the financial performance of a new product in the case of frequent product changes or complex projects. Originality/value – For the first time behavioral theory is applied to the phenomenon of production launch and problem solving.

scholarly journals Restriction on orbital angular momentum distribution: a role of media in vortex beams propagation

2018 ◽  
Vol 26 (13) ◽  
pp. 17227 ◽  
Author(s):  
Tao Zhang ◽  
Yi-Dong Liu ◽  
Kuo Yang ◽  
Jiandong Wang ◽  
Pusheng Liu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Momentum Distribution ◽  
Vortex Beams

Assessing the role of corrections included in the GRACE/GRACE-FO data in determination of hydrological and cryospheric signal in polar motion excitation

2021 ◽  
Author(s):  
Justyna Śliwińska ◽  
Małgorzata Wińska ◽  
Jolanta Nastula
Keyword(s):  
Angular Momentum ◽  
Polar Motion ◽  
Reference Frames ◽  
Temporal Variations ◽  
Terrestrial Reference Frames ◽  
Geophysical Processes ◽  
Terrestrial Water ◽  
Hydrological Angular Momentum ◽  
The Impact

<p>Assessing the impact of continental hydrosphere and cryosphere on polar motion (PM) variations is one of the crucial tasks in contemporary geodesy. The pole coordinates, as one of the Earth Orientation Parameters, are needed to define the relationship between the celestial and terrestrial reference frames. Therefore, the variations in PM should be monitored and interpreted in order to assess the role of geophysical processes in this phenomenon.</p><p>The role of hydrological and cryospheric signals in PM is usually examined by computing hydrological excitation (hydrological angular momentum, HAM) and cryospheric excitation (cryospheric angular momentum, CAM) of  PM, commonly treated together as HAM/CAM.</p><p>The Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) missions deliver temporal variations of the gravity field resulting from changes in global mass redistribution. The so-called GRACE/GRACE-FO Level-3 (L3) data delivers changes in terrestrial water storage (TWS) that can be used for computation of HAM/CAM.</p><p>For best possible representation of TWS, a number of corrections are introduced in the L3 data by computing centres. Such corrections are, among others, glacial isostatic adjustment (GIA) correction, geocenter correction and C<sub>20</sub> coefficient correction.</p><p>The main goal of this study is to examine the impact of corrections included in GRACE/GRACE-FO data on HAM/CAM determined. More specifically, we test their influence on HAM/CAM trends, seasonal changes and non-seasonal variations. We also examine the change in compliance between HAM/CAM and hydrological plus cryospheric signal in geodetically observed excitation when the corrections are used. To achieve our goals, we use GRACE and GRACE-FO L3 datasets provided by Jet Propulsion Laboratory (JPL), Center for Space Research (CSR), and Goddard Space Flight Center (GSFC).</p>

The role of sports diplomacy in recognition of newly created states

2020 ◽  
pp. 92-98
Author(s):  
Marina Okladnaya ◽  
Ivan Shchehlakov
Keyword(s):  
Ad Hoc ◽  
Main Body ◽  
Sports Diplomacy ◽  
Football Match ◽  
The Government ◽  
Sport Events ◽  
Definition Of ◽  
The Impact ◽  
Problem Setting

Problem setting. Sport becomes an important part of modern life. Nowadays there are many international sports competitions and events, where unrecognized states take part. In connect with this, such cases have an impact on society and social media. Consequently, there is a question of the impact of sports diplomacy on recognition of states and its importance on this procedure. Target research. To identify the impact of sport diplomacy on the recognition of newly created states. Analysis of recent researches and publications. The object of research was recognition in international law of a large number of both domestic and foreign scientists, among which, Telipko V.E., Ovcharenko A.S., Feldman D.І., Janatayev H.M., whose doctrinal developments provide an important theoretical basis for studying the issue of the impact of sports diplomacy on recognition of states. Article’s main body. Forms of recognition of states were identified in the article. It was determined that there are three form of recognition: de jure, de facto and ad hoc. Definition of sports diplomacy was given. It was proposed that in ad hoc recognition as the representative of the state should be considered not only a representative of the Government, but also other persons with official powers given by authorities. Cases of using sports diplomacy were analyzed. Usually a platform of sports diplomacy is different sport events where unrecognized states take part. The examples of such events are participation of Kosovo Republic in Olimpic Games in Brazil, Kosovo’s entry into FIFA, the football match between Kosovo Republic and Ukraine and others. In this way, sports representatives of the states enter into the negotiations and establish relationships between the states, which don’t recognize each other. It was found that sports diplomacy can be a way of ad hoc recognition. Conclusions and prospects of development. Sports diplomacy is a type of diplomacy, which purpose is to provide state foreign policy in the field of sports. However, sports diplomacy doesn’t cause de jure or de facto recognition of states; it can influence on recognition of the states by helping to build relationships between them.

Local Ownership of the International Criminal Tribunal for Rwanda: Restorative and Retributive Effects

2012 ◽  
Vol 12 (3) ◽  
pp. 427-456 ◽  
Author(s):  
Matthew Saul
Keyword(s):  
Ad Hoc ◽  
International Criminal ◽  
Negative Impact ◽  
International Criminal Tribunal ◽  
Local Ownership ◽  
International Criminal Tribunals ◽  
Central Argument ◽  
The Impact ◽  
Local Input

This article identifies and explores the approach taken by the UN Security Council to local ownership of the establishment of the International Criminal Tribunal for Rwanda (ICTR). In so doing, the article seeks to contribute toward a comprehensive understanding of the role of the ICTR in transitional Rwanda, as well as to identify lessons for the initiation of ad hoc international criminal tribunals in the future. The perspective that is adopted is centred on considerations of restoration, but attention is also given to the impact of the approach taken to the establishment of the ICTR on the delivery of retribution. A central argument is that the possibility of including a broad range of local input during the establishment of an international criminal tribunal should be taken seriously, as this represents a useful opportunity to enhance the legitimacy of a tribunal and its outcomes. However, it is also contended that any attempt at fostering a sense of local ownership during the establishment of an international criminal tribunal should be tailored to suit the context, in order to reduce the scope for it to have a negative impact on the overall effectiveness of a tribunal.

scholarly journals The role of the clinical professions in the regulation of healthcare in England: walking the tightrope

2009 ◽  
Vol 33 (9) ◽  
pp. 321-324
Author(s):  
Paul Lelliott
Keyword(s):  
Ad Hoc ◽  
Healthcare Services ◽  
Care Quality ◽  
Clinical Expertise ◽  
Delivery Of Care ◽  
Care Quality Commission ◽  
The Impact ◽  
Ownership Of Information

SummaryThe Royal Colleges and other professional bodies could use their clinical expertise, authority and influence with clinicians to improve the quality of regulation of healthcare services. At present, their contribution to regulation in England is ad hoc and informal. Better engagement could increase the impact that professional bodies have on patient care and create a new role for them as arbiters of quality in the organisation and delivery of care. the requirement for healthcare provider organisations to register with the Care Quality Commission from April 2010 and the National Health Service Next Stage Review have created an opportunity for closer collaboration. However, there are problems that must be overcome. These include the ownership of information about the quality of care and the uses to which this is put. It would be self-defeating if closer working with the regulator undermined the trust that clinicians have in quality improvement work led by the professional bodies.

scholarly journals Employing TALYS to deduce angular momentum rootmean-square values, Jrms, in fission fragments

2020 ◽  
Vol 239 ◽  
pp. 03019
Author(s):  
A Al-Adili ◽  
A. Solders ◽  
V. Rakopoulos
Keyword(s):  
Angular Momentum ◽  
Nuclear Reaction ◽  
Fission Process ◽  
Fission Fragments ◽  
Angular Momenta ◽  
Isomeric Yield ◽  
Consistent Performance ◽  
Spin Distributions ◽  
Nuclear Applications ◽  
Do So

Fission fragments exhibit large angular momenta J, which constitutes a challenge for fission models to fully explain. Systematic measurements of isomeric yield ratios (IYR) are needed for basic nuclear reaction physics and nuclear applications, especially as a function of mass number and excitation energy. One goal is to improve the current understanding of the angular momentum generation and sharing in the fission process. To do so, one needs to improve the modeling of nuclear de-excitation. In this work, we have used the TALYS nuclear-reaction code to relax excited fission fragments and to extract root-mean-square (rms) values of initial spin distributions, after comparison with experimentally determined IYRs. The method was assessed by a comparative study on 252Cf(sf) and 235U(nth,f). The results show a consistent performance of TALYS, both in comparison to reported literature values and to other fission codes. A few discrepant Jrms values were also found. The discrepant literature values could need a second consideration as they could possibly be caused by outdated models. Our TALYS method will be refined to better comply with contemporary sophisticated models and to reexamine older deduced values in literature.

scholarly journals Force-Mediating Particle of Coupling of Spin Angular Momenta

2021 ◽  
pp. 49-65
Author(s):  
ShaoXu Ren
Keyword(s):  
Angular Momentum ◽  
Topological Space ◽  
Spin Coupling ◽  
Spin Angular Momentum ◽  
Spin Particle ◽  
Angular Momenta

In this paper, a hypothesis is proposed, that something similar to what happen to the puzzle of the energy losing in decay of neutron may also occur to the puzzle of the sum losing of the z-components of spin angular momenta in the synthetic course of spin coupling in Spin Topological Space. The former puzzle is related to hidden neutrial antineutrino that carries a small amount of energy away, the latter puzzle is related to hidden "constructive" zero-spin particle playing the role of a force-mediator that carries some amount of spin angular momentum, which just offsets the same amount of angular momentum losing in the formation of spin coupling.

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