Results 31 to 40 of about 29,016 (334)
The Berkeley tunable far infrared laser spectrometers [PDF]
, 1991 A detailed description is presented for a tunable far infrared laser spectrometer based on frequency mixing of an optically pumped molecular gas laser with tunable microwave radiation in a Schottky point contact diode.
Blake, G. A. +7 more
core +1 more source
Fibered spherical 3-orbifolds [PDF]
, 2015 In early 1930s Seifert and Threlfall classified up to conjugacy the finite subgroups of $\mathrm{SO}(4)$, this gives an algebraic classification of orientable spherical 3-orbifolds. For the most part, spherical 3-orbifolds are Seifert fibered.
Mecchia, Mattia, Seppi, Andrea
core +3 more sources
Leida xuebao, 2023 The radar seeker is the core equipment for the terminal guidance of precision-guided weapons. It has significant benefits, such as long range and weather resistance, and plays an important role in ensuring the accuracy of missile strikes.
Haoliang LI, Siwei CHEN
doaj +1 more source
Corner reflectors and Quantum-Non-Demolition Measurements in gravitational wave antennae
, 2004 We propose Fabry-Perot cavity with corner reflectors instead of spherical mirrors to reduce the contribution of thermoelastic noise in the coating which is relatively large for spherical mirrors and which prevents the sensitivity better than Standard ...
Abramovici +22 more
core +1 more source
Remote Sensing, 2023 C-SAR/01 and C-SAR/02 serve as successors to the GF-3 satellite. They are designed to operate in tandem with GF-3, collectively forming a C-band synthetic aperture radar (SAR) satellite constellation.
Yanan Jiao +5 more
doaj +1 more source
A Low Noise Receiver for Submillimeter Astronomy [PDF]
, 1986 A broadband, low noise heterodyne receiver, suitable for astronomical use, has been built using a Pb alloy superconducting tunnel junction (SIS). The RF coupling is quasioptical via a bowtie antenna on a quartz lens and is accomplished without any tuning
Miller, R. E. +3 more
core +1 more source
Variable beamwidth corner reflector antenna
Electronics Letters, 1998 A simple and successful design for a variable beamwidth corner reflector antenna is presented. The gain and the -3 dB beamwidth of the antenna are predicted using the finite difference time domain (FDTD) method. The predicted results are compared with measured data and good agreement is reported.
U.O. Sterr +2 more
openaire +1 more source
A New Corner-Reflector Antenna With Tunable Gain Based on Active Frequency Selective Surfaces
IEEE Open Journal of Antennas and Propagation, 2020 A new corner-reflector antenna with a tunable gain based on active frequency selective surfaces (AFSSs) is presented. The proposed design comprises a dipole antenna as a source of the electromagnetic (EM) waves, and three reconfigurable AFSS layers of ...
Ghada Hussain Elzwawi +3 more
doaj +1 more source
Shock wave focusing using geometrical shock dynamics [PDF]
, 1997 A finite-difference numerical method for geometrical shock dynamics has been developed based on the analogy between the nonlinear ray equations and the supersonic potential equation.
Cates, J. E., Sturtevant, B.
core +1 more source
Absorbing properties of metamaterial dihedral corner reflector
Materials Research Express, 2020 In this paper, the absorbing property of metal-cross shaped metamaterial dihedral (MCMD) and cross-cross shaped metamaterial dihedral (CCMD) with the same parameters are investigated. In TE mode, the absorptivities are 91.1% at 9.17 GHz for MCMD and 99.7%
Taoming Lu +5 more
doaj +1 more source