scholarly journals Bargmann–Wigner formulation and superradiance problem of bosons and fermions in Kerr space–time

2015 ◽  
Vol 30 (11) ◽  
pp. 1550052 ◽  
Author(s):  
Masakatsu Kenmoku ◽  
Y. M. Cho
Keyword(s):  
Negative Energy ◽  
Space Time ◽  
The Other ◽  
Positive Energy ◽  
Independent Components ◽  
Consistent Description ◽  
Other Hand ◽  
Kerr Space

The superradiance phenomena of massive bosons and fermions in the Kerr space–time are studied in the Bargmann–Wigner formulation. In case of bi-spinor, the four independent components spinors correspond to the four bosonic freedom: one scalar and three vectors uniquely. The consistent description of the Bargmann–Wigner equations between fermions and bosons shows that the superradiance of the type with positive energy (0 < ω) and negative momentum near horizon (p H < 0) is shown not to occur. On the other hand, the superradiance of the type with negative energy (ω < 0) and positive momentum near horizon (0 < p H ) is still possible for both scalar bosons and spinor fermions.

Space creation, structural construction and force distribution

2013 ◽  
Vol 4 (1) ◽  
pp. 1-12
Author(s):  
G. Lámer
Keyword(s):  
The Other ◽  
Frame Structure ◽  
Force Distribution ◽  
Independent Components ◽  
Other Hand

Abstract The paper is an overview of issues related to the space creation of a building, possibilities of developing frame structure and connections of force distribution in the construction. In plane the force distribution can be compression, bending and tension. In space “enclosing” a geometric solid means space creation. In space as it is to be expected, the force distribution must be compression, bending and tension in two different directions at the same time. This can be really variant but in the case of surface or surface-like constructions generated by translations (and/or rotations) on one hand, there are some other surfaces, which cannot be generated by translations (and/or rotations), on the other hand, the dimension of the inside “forces” is not two but three (independent components of a two-by-two tensor either in the case of compression tension, or in the case of bending). By this, force distribution is more complicated in space than in plane.

scholarly journals Amos: ’n teologie van bedreiging?

1998 ◽  
Vol 32 (3) ◽  
Author(s):  
J. L. Helberg
Keyword(s):  
Space Time ◽  
The Other ◽  
Moral Justification ◽  
The Real ◽  
Other Hand ◽  
Personal Approach ◽  
History Of

The book of Amos contains many undertones of threat, except in the epilogue which, according to many scholars, is redactional The question thus comes to the fore whether this characteristic implies that God is seen by Amos as a God of threat for whom one can only have fear. This article, however, points out Amos’ moral justification of God's deeds. Israel's actions, on the other hand, display a self-centredness and a lack of theocentric and personal approach. Within this framework the history of salvation, especially the exodus and the conquest of the land, as well as the election, covenant and the idea of the remnant, is fossilised and God is made a captive of space, time and relations. However, Amos' proclamation implies that in reality God cannot be made captive - neither of such a religion nor of a theology of threat. Amos envisions a situation in which everything will comply with the real aim set for it/him.

Interpretation of 25-OH-D3, NEFA, and calcium correlations among cow and calf pairs

2025 ◽  
Vol 77 (04) ◽  
pp. 6511-2025
Author(s):  
SONGUL ERDOGAN ◽  
KEREM URAL ◽  
HASAN ERDOGAN ◽  
DENIZ ALIC URAL ◽  
MEHMET GULTEKIN ◽  
...  
Keyword(s):  
Energy Balance ◽  
Vitamin D3 ◽  
Colorimetric Method ◽  
Negative Energy ◽  
The Other ◽  
Negative Energy Balance ◽  
Test Results ◽  
Blood Samples ◽  
Other Hand ◽  
Cow Calf

In the present study, the aim was to determine alteration of NEFA, calcium and vitamin D3 levels in cow and calf pairs at parturition as well as correlation between each parameter levels. For this purpose, a cow-side device employing the enzymatic colorimetric method was used for measurement of NEFA and calcium levels. On the other hand, serum 25(OH)D3 analysis was performed using the fluorescence immunochromatographic method at the laboratory in the Faculty. Blood samples were taken from Vena jugularis of 15 Simmental cow and calf pairs immediately after parturition and placed in serum and heparinized tubes. In cow and calf pairs, concentration of vitamin D3 (15.6-120 and 31.8-120 ng/mL, respectively), NEFA (0.12-1.2 and 0.09-0.8 mmol/L, respectively) and calcium (1.8 ± 0.9 and 2.2 ± 0.6 mmol/L, respectively) were determined. There was no significant correlation between NEFA, Ca, and vitamin D3 in cows and calf pairs. Taking into account several co-factors that influenced test results, which could not easily be excluded, further studies may be warranted with larger cow-calf pair populations. In conclusion, vitamin D3 concentration in calves is not affected by the negative energy balance of dams in the parturition period.

The Tale of Fabled Creatures

2021 ◽  
pp. 215-233
Author(s):  
M. Nur Erdem
Keyword(s):  
Digital Media ◽  
Daily Life ◽  
Space Time ◽  
Point Of View ◽  
The Other ◽  
Other Hand ◽  
The Media ◽  
The Subject ◽  
Physical Beauty

Violence has been a part of daily life in both traditional and digital media. Consequently, neither the existence of violence in the media nor the debates on this subject are new. On the other hand, the presentation of violence in fictional content should be viewed from a different point of view, especially in the context of aesthetization. Within this context, in this chapter, the serial of Penny Dreadful is analyzed. As analyzing method, Tahsin Yücel's model of the “space/time coordinates of narrative” is used. And the subject of “aestheticization of violence” is analyzed through a serial with the elements of person, space, and time. Thus, the role of not only physical beauty but also different components in the aestheticization of violence is examined.

Some aspects of energy metabolism of the sow during pregnancy

1971 ◽  
Vol 13 (4) ◽  
pp. 677-683 ◽  
Author(s):  
M. W. A. Verstegen ◽  
A. J. H. van Es ◽  
H. J. Nijkamp
Keyword(s):  
Energy Requirement ◽  
Live Weight ◽  
Negative Energy ◽  
The Other ◽  
Positive Energy ◽  
Dietary Energy ◽  
Respiration Chamber ◽  
Dietary Energy Intake ◽  
Energy Balances ◽  
Balance Trials

SUMMARYSixteen energy and N-balance trials with six sows were performed to study the energy requirement and protein gain of the animals during different stages in the second half of pregnancy. Energy and N-balances were measured during periods of 1 week and gaseous exchange was measured in a respiration chamber. The animals received 2·0,2·5,2·75 or 3 0 kg/day of a normal concentrate ration for sows. In one experiment, one animal had a negative energy balance on the 2 kg ration in the sixth week of pregnancy but in the other experiments the dietary energy intake was sufficient for positive energy balances until a few days before parturition. The N-balances were about 20 to 32 g/day in the second half of the gestation period. With 2·5 and 2·75 kg feed there was a negative deposition of fat at about 2 weeks before parturition. Heat production increased during pregnancy, but at a greater rate during the last 2 weeks. Until 2 to 3 weeks before parturition 2·5 to 2·75 kg of feed seemed to be adequate to meet the energy requirement of a pregnant sow of 180–200 kg live weight. During the last 2 weeks 3 kg was sufficient.

scholarly journals Reflexões sobre a educação escolar quilombola: elementos para a prática docente

Horizontes ◽  
2015 ◽  
Vol 33 (2) ◽  
Author(s):  
Evanilson Tavares de França ◽  
Maria Batista Lima
Keyword(s):  
Teaching Practice ◽  
Space Time ◽  
Power Relation ◽  
School Education ◽  
The Other ◽  
African Culture ◽  
Other Hand ◽  
Pedagogic Institute ◽  
Black Movement ◽  
Do So

ResumoA compreensão de quilombo como território de resistência e preservação da cultura de base africana perpassa os discursos de pesquisadores diversos, como Almeida, O’Dwyer e Arruti, inserindo-se nas análises deste último as ressemantizações sofridas pelo termo e os determinantes históricos que as trouxeram à luz. A ressemantização, ainda segundo Arruti, que interpreta quilombo como território de resistência, vai compor as bandeiras do Movimento Negro Unificado (MNU). Por outro lado, o entendimento de currículo como relação de poder e como instrumento/estratégia capaz de interferir na formação do outro revela o quanto este instituto pedagógico é capaz de inserir/excluir, empoderar/fragilizar, desvelar/camuflar. É neste cenário de entendimentos que se insereeste artigo, objetivando pensar/propor saberes capazes de fomentar a Educação Escolar Quilombola nosterritórios dos remanescentes quilombos e nas unidades de ensino que atendem a estudantes originários/as daquelas comunidades. Para tanto, construímos diálogos com as legislações (vigentes) e com teóricos que abordam a temática. Palavras-chave: quilombo; currículo; educação escolar quilombola. Reflections on quilombola school education: elements for teaching practice AbstractThe understanding of a quilombo as a resistance territory and african culture preservation territory permeates the words of several researchers, such as Almeida, O’Dwyer and Arruti, being inserted in the last author’s analysis the changes in meaning suffered by the expression and the historical determinants which brought those to light. – It’s precisely the change in meaning, still according to Arruti, who interprets a quilombo as a space/time of resistance that will compose the flags of the United Black Movement (UBM). On the other hand, the understanding of curriculum as a power relation and as a tool/strategy capable of interfering in the formation of other emphasizes how much this pedagogic institute is able to insert/exclude, empower/weaken, revealing/hiding. It is in such a scenario of thoughts and understandings that this article is inserted, aiming to think/propose knowledges capable of promoting Quilombola School Education in the territories of the remaining quilombos and at the educational units that assist students originated/from that community. To do so, we have established dialogues with legislations (in effect) and also with theorists who do research on the topic.Keywords: quilombo; curriculum; quilombola school education.

scholarly journals Relativistic Brueckner-Hartree-Fock Theory in Infinite Nuclear Matter

2021 ◽  
Vol 252 ◽  
pp. 02001
Author(s):  
Peter Ring ◽  
Sibo Wang ◽  
Qiang Zhao ◽  
Jie Meng
Keyword(s):  
Nuclear Matter ◽  
Complete Solution ◽  
Negative Energy ◽  
The Other ◽  
Positive Energy ◽  
Density Functionals ◽  
Matrix Elements ◽  
Hartree Fock ◽  
Microscopic Derivation ◽  
Covariant Density

On the way of a microscopic derivation of covariant density functionals, the first complete solution of the relativistic Brueckner-Hartree-Fock (RBHF) equations is presented for symmetric nuclear matter. In most of the earlier investigations, the G-matrix is calculated only in the space of positive energy solutions. On the other side, for the solution of the relativistic Hartree-Fock (RHF) equations, also the elements of this matrix connecting positive and negative energy solutions are required. So far, in the literature, these matrix elements are derived in various approximations. We discuss solutions of the Thompson equation for the full Dirac space and compare the resulting equation of state with those of earlier attempts in this direction.

scholarly journals RADIATION OF THE INNER HORIZON OF THE REISSNER–NORDSTRÖM BLACK HOLE

2006 ◽  
Vol 15 (06) ◽  
pp. 817-843 ◽  
Author(s):  
ARI PELTOLA ◽  
JARMO MÄKELÄ
Keyword(s):  
Black Hole ◽  
Quantum Effects ◽  
Negative Energy ◽  
Space Time ◽  
Black Hole Thermodynamics ◽  
Positive Energy ◽  
Positive Temperature ◽  
White Hole ◽  
Virtual Particle ◽  
Inner Horizon

Despite over thirty years of research in black hole thermodynamics, our understanding of the possible role played by the inner horizons of Reissner–Nordström and Kerr–Newman black holes in black hole thermodynamics is still somewhat incomplete. There are derivations which imply that the temperature of the inner horizon is negative and it is not quite clear what this means. Motivated by this problem, we perform a detailed analysis of the radiation emitted by the inner horizon of the Reissner–Nordström black hole. As a result, we find that in a maximally extended Reissner–Nordström space–time virtual particle–antiparticle pairs are created at the inner horizon of the Reissner–Nordström black hole such that real particles with positive energy and temperature are emitted towards the singularity from the inner horizon and, as a consequence, antiparticles with negative energy are radiated away from the singularity through the inner horizon. We show that these antiparticles will be emitted from the white hole horizon in the maximally extended Reissner–Nordström space–time, at least when the hole is near extremality. The energy spectrum of the antiparticles leads to a positive temperature for the white hole horizon. In other words, our analysis predicts that in addition to the radition effects of black hole horizons, the white hole horizon also radiates. The black hole radiation is caused by the quantum effects at the outer horizon, whereas the white hole radiation is caused by the quantum effects at the inner horizon of the Reissner–Nordström black hole.

Paradoxes of Nature

2020 ◽  
pp. 87-98
Author(s):  
Demetris Nicolaides
Keyword(s):  
Quantum Mechanics ◽  
Uncertainty Principle ◽  
Apparent Motion ◽  
Space Time ◽  
The Other ◽  
Even Start ◽  
Other Hand ◽  
Logical Paradoxes

Parmenides’s insinuation of an unchanging universe is assertively supported by Zeno with various logical paradoxes that question the very nature of plurality, space, time, and the reality of apparent motion. The dichotomy is his most famous paradox. To begin a trip, say, from here to the door, a traveler must travel the first half of it, but before she does that she must travel half of the first half, and in fact half of that, ad infinitum. Since there will always exist a smaller first half to be traveled first, Zeno questions whether a traveler can ever even start a trip. Zeno’s analysis is logical; on the other hand, things everywhere appear to be moving. Hence, either Zeno’s reasoning is wrong or appearances are deceptive. Empowered by the uncertainty principle of quantum mechanics, it will be argued that, at best, the phenomenon of motion is experimentally unverifiable!

Sign in / Sign up

Export Citation Format

Share Document