Results 31 to 40 of about 1,607 (205)
Spectrum occupancy measurements and lessons learned in the context of cognitive radio [PDF]
, 2015 Various measurement campaigns have shown that numerous spectrum bands are vacant even though licenses have been issued by the regulatory agencies. Dynamic spectrum access (DSA) based on Cognitive Radio (CR) has been regarded as a prospective solution to ...
Ammar, M. +4 more
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Zebra stripes: the questions raised by the answers
Biological Reviews, Volume 100, Issue 6, Page 2660-2680, December 2025.ABSTRACT Multiple hypotheses have been suggested to explain why the three zebra species (Equus quagga, E. grevyi and E. zebra) are striped. We review how well these theories explain the nature (rather than simply the existence) of the stripes. Specifically, we explore how well different theories explain (i) the form of zebra stripes (especially on ...
Hamish M. Ireland, Graeme D. Ruxton
wiley +1 more source
Biconical antennas with elliptical cross-sections
Electronics Letters, 2000 The methods of coordinate transformation and conformal mapping are applied to study the problem of radiation from a biconical antenna with elliptic cross section. The infinite elliptic cone geometry can be transformed into the two-dimensional plane under the assumption of pure TEM spherical waves.
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Radio Science, Volume 60, Issue 10, October 2025.Abstract This paper presents wideband indoor channel measurements in three of the millimeter wave (mmWave) bands for the fifth generation (5G) and beyond 5G (B5G) wireless systems. Measurements were conducted at the Ka‐band (36–41 GHz) and V‐band (50–75 GHz) in office and factory/industrial environments, using Durham University's custom‐designed ...
Amar Al‐jzari, Sana Salous
wiley +1 more source
Single and Multiple Scattering in UWB Bicone Arrays
International Journal of Antennas and Propagation, 2008 An analysis of interactions between radiators in a UWB biconical array, drawing attention to single and multiple scatterings, is carried out. The complementarity between electrical coupling and radiation scattering is argued.
Raffaele D'Errico, Alain Sibille
doaj +1 more source
Biconical antennas with unequal cone angles [PDF]
IEEE Transactions on Antennas and Propagation, 1998 The problem of radiation and reception of electromagnetic waves associated with a spherically capped biconical antenna having unequal cone angles /spl psi//sub 1/ and /spl psi//sub 2/ is investigated. Both cones that comprise a bicone are excited symmetrically at the apices by a voltage source so that the only higher order modes are TM.
S.N. Samaddar, E.L. Mokole
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InfoMat, Volume 7, Issue 8, August 2025.Aiming at the management of MRSA biofilms, an all‐in‐one optical microfiber that integrated rapid quantitative analysis with synergistic antimicrobial therapy is developed. The prepared interfacial‐functionalized optical microfiber demonstrates the ability to detect MRSA concentrations in infection sites, enhance therapeutic efficacy, and assess ...
Pengwei Chen +7 more
wiley +1 more source
Oxford Journal of Archaeology, Volume 44, Issue 3, Page 228-247, August 2025.Summary This study examines four exceptional lead boat‐shaped objects recovered from the fourteenth‐century BC Chamber Tomb ZZ at the cemetery of the cosmopolitan city of Hala Sultan Tekke, Cyprus. A closely related lead object was also found in Stratum 1 of City Quarter 4 at Hala Sultan Tekke, dating to the early twelfth century BC.
Peter M. Fischer, Tzveta V. Manolova
wiley +1 more source
Advanced Science, Volume 12, Issue 28, July 24, 2025.Colloidal nanoparticles self‐assembly advances towards intelligent, customized assembly through precise control of binary co‐assemblies. This review explores the evolution from monolithic to binary assemblies, highlighting how the AI‐guided programmable assembly approach has the potential to shift from passive assembly to active intelligent design.
Cancan Li +5 more
wiley +1 more source
Omnidirectional microwave spacecraft antenna Patent [PDF]
, 1968 Microwave ominidirectional antenna for use on ...
Croswell, W. F., Gilreath, M. C.
core +1 more source