Results 41 to 50 of about 1,607 (205)

New Standards for the Validation of EMC Test Sites particularly above 1 GHz [PDF]

, 2005
Standards for the validation of alternative test sites with conducting groundplane exist for the frequency range 30-1000 MHz since the end of the eighties.
F. W. Trautnitz, H. Garbe, S. Battermann
core   +2 more sources

Oued Chebeika 002: A new CI1 meteorite linked to outer solar system bodies

Meteoritics &Planetary Science, Volume 60, Issue 7, Page 1441-1479, July 2025.
Abstract CI1 chondrites are rare meteorites with high scientific value. In fact, they are the most chemically primitive meteorites and show evidence of intense parent‐body aqueous alteration. They also share strong similarities with samples from Ryugu and Bennu asteroids returned by the JAXA Hayabusa2 and NASA's OSIRIS‐REx missions.
J. Gattacceca, M. Gounelle, B. Devouard, J.‐A. Barrat, L. Bonal, A. J. King, C. Maurel, P. Beck, M. Roskosz, J.‐C. Viennet, D. Mukherjee, N. Dauphas, P. R. Heck, T. Yokoyama, K. López García, O. Poch, O. Grauby, C. S. Harrison, V. Vinogradoff, P. Vernazza, S. Tikoo, V. Vidal, P. Rochette, D. AuYang, D. Borschneck, J. Juraszek, B. Clark   +26 more
wiley   +1 more source

Approximate Analysis on a Wide Angle Biconical Antenna

Tongxin xuebao, 1984
In this paper, the broad band performance of a wideangle biconical antenna has been analysed and demonstrated. First, the formulas by which its pattern and input impedance can be calculated are developed.
Lin Changlu
doaj   +2 more sources

Thermo‐Mechanical Degradation Kinetics of a High‐Density Poly(Ethylene) Using a Closed‐Cavity Rheometer

Journal of Applied Polymer Science, Volume 142, Issue 17, May 5, 2025.
A time and material saving method to investigate multiple processing of polyolefins is developed. A commercial rheometer is used to emulate a thermo‐mechanical treatment of the polymer during processing. A kinetic model is suggested to predict the change of the molecular weight as a function of time, temperature and in‐phase shear stress.
Tim Schülein, Christos K. Georgantopoulos, Lars Bolk, Volker Herrmann, Manfred Wilhelm   +4 more
wiley   +1 more source

Evaluation of prediction accuracy for the Longley-Rice model in the FM and TV bands [PDF]

, 2013
Accurate geographical coverage predictions maps for FM and TV are needed for channel and frequency allocations and in order to avoid unwanted interferences.
Bizopoulos, Aristotelis, Cosmas, John, Kasampalis, Stylianos, Lazaridis, Pavlos, Zaharis, Zaharias D.   +4 more
core  

Absolute calibration of the LOPES antenna system

, 2005
Radio emission in extensive air showers arises from an interaction with the geomagnetic field and is subject of theoretical studies. This radio emission has advantages for the detection of high energy cosmic rays compared to secondary particle or ...
Apel, W. D., Badea, F., Bahren, L., Bekk, K., Bercuci, A., Bertaina, M., Biermann, P. L., Blumer, J., Bozdog, H., Butcher, Harvey, Nehls, S.   +10 more
core   +2 more sources

Ancient and historical cooking pots and food: an eternal communion. A topical review

Archaeometry, Volume 67, Issue 1, Page 219-234, February 2025.
Abstract This contribution provides a topical view at and review of traditional clay‐based utilitarian cooking pots that were used for millennia to prepare, serve, display, and distribute foodstuff. Key mechanical and thermal properties of ceramic cooking vessels will be discussed and strategies of property optimization outlined.
Robert B. Heimann
wiley   +1 more source

Review of conceptual and empirical approaches to characterize infiltration

Vadose Zone Journal, Volume 24, Issue 1, January/February 2025.
Abstract Infiltration regulates the movement and storage of water at the soil–atmosphere interface and is, therefore, a key component of many related physical and biogeochemical processes. Numerous studies have examined infiltration over the past two centuries.
Christelle Basset, Majdi Abou Najm, Rafael Angulo‐Jaramillo, Vincenzo Bagarello, Behzad Ghanbarian, Simone Di Prima, Massimo Iovino, Laurent Lassabatère, Ryan Stewart   +8 more
wiley   +1 more source

Biconical Cavity Utilised in Realising Quadruple‐ and Quintuple‐Mode Wideband Bandpass Filters

IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
This article introduces the biconical cavity as a novel multimode resonator for wideband bandpass filters, enabling effective mode separation and suppression of higher‐order resonances. A quadruple‐mode prototype operating at 3.82 GHz with 46.8% FBW and a quintuple‐mode prototype at 3.52 GHz with 67.2% FBW were designed, fabricated and measured ...
Maha H. Elfeshawy, Hany F. Hammad, Yasmine A. Zaghloul   +2 more
wiley   +1 more source

Accommodating version of a schematic eye for emmetropia and myopia

Ophthalmic and Physiological Optics, Volume 45, Issue 1, Page 221-230, January 2025.
Abstract Aim To develop an accommodating, wide‐angle, schematic eye for emmetropia and myopia in which spectacle refraction and accommodation level are input parameters. Method The schematic eye is based on an earlier unaccommodated refraction‐dependent eye for myopia developed by Atchison in 2006.
David A. Atchison, W. Neil Charman
wiley   +1 more source