A case of dual interpretation of Einstein-Maxwell fields

1985 ◽  
Vol 17 (4) ◽  
pp. 381-385 ◽  
Author(s):  
P. Wils ◽  
N. Van den Bergh
Keyword(s):  
Maxwell Fields ◽  
Dual Interpretation

scholarly journals Phenotypic Detection of Metallo-β-Lactamase in Imipenem-ResistantPseudomonas aeruginosa

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Yalda Khosravi ◽  
Mun Fai Loke ◽  
Eng Guan Chua ◽  
Sun Tee Tay ◽  
Jamuna Vadivelu
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbapenem Resistance ◽  
Detection Capability ◽  
Interpretation Criteria ◽  
Choice Of Treatment ◽  
Feasible Option ◽  
Dual Interpretation ◽  
Global Concern ◽  
Synergy Test ◽  
Disk Test

Carbapenems are the primary choice of treatment for severePseudomonas aeruginosainfection. However, the emergence of carbapenem resistance due to the production of metallo-β-lactamases (MBLs) is of global concern. In this study, 90 imipenem- (IPM- or IP-) resistantP. aeruginosa(IRPA) isolates, including 32 previously tested positive and genotyped for MBL genes by PCR, were subjected to double-disk synergy test (DDST), combined disk test (CDT), and imipenem/imipenem-inhibitor (IP/IPI)E-test to evaluate their MBLs detection capability. All three methods were shown to have a sensitivity of 100%. However, DDST was the most specific of the three (96.6%), followed by IP/IPIE-test interpreted based on the single criteria of IP/IPI≥8as positive (62.1%), and CDT was the least specific (43.1%). Based on the data from this evaluation, we propose that only IRPA with IP MIC>16 μg/mL and IP/IPI≥8by IP/IPIE-test should be taken as positive for MBL activity. With the new dual interpretation criteria, the MBL IP/IPIE-test was shown to achieve 100% sensitivity as well as specificity for the IRPA in this study. Therefore, the IP/IPIE-test is a viable alternative phenotypic assay to detect MBL production in IRPA in our population in circumstances where PCR detection is not a feasible option.

Boundary conditions for Maxwell fields in Kerr-AdS spacetimes

2016 ◽  
Vol 25 (09) ◽  
pp. 1641011 ◽  
Author(s):  
Mengjie Wang
Keyword(s):  
Black Holes ◽  
Angular Momentum ◽  
Boundary Conditions ◽  
Energy Flux ◽  
Momentum Flux ◽  
De Sitter ◽  
Perturbative Methods ◽  
Flux Boundary Conditions ◽  
Maxwell Fields ◽  
New Type

Perturbative methods are useful to study the interaction between black holes and test fields. The equation for a perturbation itself, however, is not complete to study such a composed system if we do not assign physically relevant boundary conditions. Recently we have proposed a new type of boundary conditions for Maxwell fields in Kerr-anti-de Sitter (Kerr-AdS) spacetimes, from the viewpoint that the AdS boundary may be regarded as a perfectly reflecting mirror, in the sense that energy flux vanishes asymptotically. In this paper, we prove explicitly that a vanishing energy flux leads to a vanishing angular momentum flux. Thus, these boundary conditions may be dubbed as vanishing flux boundary conditions.

scholarly journals MPF Problem over Modified Medial Semigroup Is NP-Complete

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 571 ◽  
Author(s):  
Eligijus Sakalauskas ◽  
Aleksejus Mihalkovich
Keyword(s):  
Power Function ◽  
Polynomial Time ◽  
Cryptographic Protocols ◽  
Binary Field ◽  
Dual Interpretation ◽  
Np Complete ◽  
Matrix Power ◽  
Necessary Constraints ◽  
One Way Function ◽  
Polynomial Time Reduction

This paper is a continuation of our previous publication of enhanced matrix power function (MPF) as a conjectured one-way function. We are considering a problem introduced in our previous paper and prove that tis problem is NP-Complete. The proof is based on the dual interpretation of well known multivariate quadratic (MQ) problem defined over the binary field as a system of MQ equations, and as a general satisfiability (GSAT) problem. Due to this interpretation the necessary constraints to MPF function for cryptographic protocols construction can be added to initial GSAT problem. Then it is proved that obtained GSAT problem is NP-Complete using Schaefer dichotomy theorem. Referencing to this result, GSAT problem by polynomial-time reduction is reduced to the sub-problem of enhanced MPF, hence the latter is NP-Complete as well.

scholarly journals Positive Energy Driven CTCs In ADM 3+1 Space – Time of Unprotected Chronology

2021 ◽  
Author(s):  
Deep Bhattacharjee
Keyword(s):  
Energy Density ◽  
Energy Momentum Tensor ◽  
Momentum Tensor ◽  
Space Time ◽  
Exotic Matter ◽  
Positive Energy ◽  
Spacelike Hypersurfaces ◽  
Stress Energy ◽  
Maxwell Fields ◽  
Stress Energy Momentum Tensor

Chronology unprotected mechanisms are considered with a very low gravitational polarization to make the wormhole traversal with positive energy density everywhere. No need of exotic matter has been considered with the assumption of the Einstein-Dirac-Maxwell Fields, encountering above the non-zero stress-energy-momentum tensor through spacelike hypersurfaces by a hyperbolic coordinate shift.

?Infrared? Maxwell fields

1986 ◽  
Vol 18 (6) ◽  
pp. 633-640 ◽  
Author(s):  
S. Chakravarty ◽  
J. Ivancovich ◽  
E. T. Newman
Keyword(s):  
Maxwell Fields

On some Einstein-Maxwell fields of high symmetry

1985 ◽  
Vol 17 (7) ◽  
pp. 659-668 ◽  
Author(s):  
M. A. H. MacCallum
Keyword(s):  
High Symmetry ◽  
Maxwell Fields
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