Results 241 to 250 of about 238,679 (287)

Magnetized Emergent Universe with Null Radiation Flow

International Journal of Theoretical Physics, 2015
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
J K Singh
exaly   +3 more sources

Generation of Radiation Null for the HMSIW Leaky-Wave Antenna

IEEE Antennas and Wireless Propagation Letters, 2017
A new design of half-mode substrate integrated waveguide leaky-wave antenna with radiation null in the radiation pattern is proposed in this letter. The radiation null is realized by controlling the leakage constant of the effective radiation sections (ERSs).
Zheng Li, Junhong Wang
exaly   +2 more sources

Bianchi Type-I Cosmological Model with Null Radiation Flow

International Journal of Theoretical Physics, 2015
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
J K Singh
exaly   +2 more sources

The realizing of radiation null for a SSPPs leaky-wave antenna

2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE), 2017
A new design of spoof surface plasmon polaritons (SSPPs) leaky-wave antenna (LWA) with radiation null in the radiation pattern is proposed in this paper. The antenna is fed with coplanar waveguide, and consists of a main radiation section and an auxiliary radiation section. By controlling the initial phase, the phase constant and the radiation strength
Junhong Wang
exaly   +2 more sources

Null cone computation of gravitational radiation

Journal of Mathematical Physics, 1983
The production of gravitational waves is explored, both analytically and numerically, using a null cone formulation of axially symmetric gravitational and matter fields. The coupled field equations are written in an integral form, on a single conformally compactified patch, which is well suited for numerical computation.
R. A. Isaacson, J. S. Welling, J. Winicour   +2 more
openaire   +1 more source

The Methods for Generating Radiation Null in Filtering Antennas

2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall), 2019
Filtering antennas have been achieved more attention for the advantages of reducing the requirement of the filter in wireless communication systems. The radiation nulls of filtering antenna can further improve the frequency selectivity and decrease the mutual coupling between the closely placed antennas operating at different frequencies so that the ...
Lei Wang, Kai Xu, Jin Shi
openaire   +1 more source

Harmonic and Null Descriptions of Gravitational Radiation

Physical Review, 1968
Abstract : The problem of an axially symmetric space-time containing gravitational waves in the usual Bondi null coordinate system is considered. This Bondi frame is then related to asymptotically harmonic coordinates by means of a characteristic initial value problem.
Richard A. Isaacson, Jeffrey Winicour
openaire   +1 more source

IV.—On Properties of Null Geodesics, and their Application to the Theory of Radiation

Proceedings of the Royal Society of Edinburgh, 1934
In a previous paper an expression was given by one of us for the Doppler effect in a de Sitter universe. In the present communication an attempt is made to obtain a more general expression for the Doppler effect, and for this purpose certain results have been derived relating to the properties of null geodesics in a general Riemannian space.
Kermack, W. O., M'Crea, W. H., Whittaker, E. T.   +2 more
openaire   +2 more sources

Slotted Waveguide Antenna With Two Radiation Nulls

IEEE Transactions on Antennas and Propagation, 2008
A design of a linear array antenna having two radiation nulls and otherwise omnidirectional radiation pattern is reported. A new configuration of a waveguide broad wall longitudinal slot doublet with positive and negative offsets with respect to the waveguide center line is used to design the array.
Priyanka Mondal, Ajay Chakrabarty
openaire   +1 more source

Null Search for Bursts of Gravitational Radiation

Physical Review Letters, 1973
A calibrated detector of kilohertz-band gravitational radiation has been built which has sufficiently improved sensitivity over Weber's apparatus to allow comparison with his two-detector coincidence results. No events were observed by us at 710 Hz during a recent three-month period of observation.
openaire   +1 more source