Results 21 to 30 of about 349,876 (317)
Covert symmetry breaking [PDF]
Journal of High Energy Physics, 2020 Abstract Reduction from a higher-dimensional to a lower-dimensional field theory can display special features when the zero-level ground state has nontrivial dependence on the reduction coordinates. In particular, a delayed ‘covert’ form of spontaneous symmetry breaking can occur, revealing itself only at fourth order in the lower ...
C. W. Erickson +3 more
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Anticounterfeit packaging technologies
Journal of Advanced Pharmaceutical Technology & Research, 2010 Packaging is the coordinated system that encloses and protects the dosage form. Counterfeit drugs are the major cause of morbidity, mortality, and failure of public interest in the healthcare system.
Ruchir Y Shah +2 more
doaj +1 more source
Nigerian Journal of Medicine, 2019 BACKGROUND: This study assessed the prevalence and determinants of covert contraceptive use among women of reproductive age in Ibadan, Nigeria. METHODS: A cross sectional study among women attending a family planning clinic in a maternity teaching ...
Olutosin A Awolude, Ayodele S Olagunju
doaj +1 more source
Covert Quantum Communication [PDF]
Physical Review Letters, 2016 We extend covert communication to the quantum regime by showing that covert quantum communication is possible over optical channels with noise arising either from the environment or from the sender's lab. In particular, we show that sequences of qubits can be transmitted covertly by using both a single photon and a coherent state encoding. We study the
Arrazola, Juan Miguel, Scarani, Valerio
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Covert Communication in Intelligent Reflecting Surface-Assisted NOMA Systems: Design, Analysis, and Optimization [PDF]
IEEE Transactions on Wireless Communications, 2020 In this paper, we investigate covert communication in an intelligent reflecting surface (IRS)-assisted non-orthogonal multiple access (NOMA) system, where a legitimate transmitter (Alice) applies NOMA for downlink and uplink transmissions with a covert ...
Lu Lv +5 more
semanticscholar +1 more source
Sound change and coarticulatory variability involving English /ɹ/
Glossa, 2019 English /ɹ/ is known to exhibit covert variability, with tongue postures ranging from bunched to retroflex, as well as various degrees of lip protrusion and compression.
Bridget J. Smith +3 more
doaj +2 more sources
Between overt and covert research: concealment and disclosure in an ethnographic study of commercial hospitality [PDF]
, 2006 This article examines the ways in which problems of concealment emerged in an ethnographic study of a suburban bar and considers how disclosure of the research aims, the recruitment of informants, and elicitation of information was negotiated throughout ...
Adler, P. A. +36 more
core +1 more source
Index on Censorship, 1999 I went to Marseille… I prowled the streets all day, feeling very strung up and ready to pounce, determined to ‘trap’ life - to preserve life in the act of living. Above all, I craved to seize the whole essence, in the confines of one single photograph, of some situation that was in the process of unrolling itself before my eyes.
openaire +1 more source
Aerial Intelligent Reflecting Surface-Enabled Terahertz Covert Communications in Beyond-5G Internet of Things [PDF]
IEEE Internet of Things Journal, 2021 Unmanned aerial vehicles (UAVs) are envisioned to be extensively employed for assisting wireless communications in the Internet of Things (IoT). On the other hand, terahertz (THz)-enabled intelligent reflecting surface (IRS) is expected to be one of the ...
Milad Tatar Mamaghani, Yi Hong
semanticscholar +1 more source
A Formulation of the Potential for Communication Condition using C2KA
, 2014 An integral part of safeguarding systems of communicating agents from covert channel communication is having the ability to identify when a covert channel may exist in a given system and which agents are more prone to covert channels than others. In this
Jaskolka, Jason, Khedri, Ridha
core +4 more sources