نتایج جستجو برای: feed horn

تعداد نتایج: 78456  

1996
Peter Jonsson Christer Bäckström

We present a new formalism, Horn Disjunctive Linear Relations (Horn DLRs), for reasoning about temporal constraints. We prove that deciding satissabil-ity of sets of Horn DLRs is polynomial by exhibiting an algorithm based upon linear programming. Furthermore , we prove that most other approaches to tractable temporal constraint reasoning can be encoded as Horn DLRs, including the ORD-Horn alge...

Journal: :Artif. Intell. 2015
James P. Delgrande Pavlos Peppas

This paper investigates belief revision where the underlying logic is that governing Horn clauses. We show that classical (AGM) belief revision doesn’t immediately generalise to the Horn case. In particular, a standard construction based on a total preorder over possible worlds may violate the accepted (AGM) postulates. Conversely, in the obvious extension to the AGM approach, Horn revision fun...

Journal: :Journal of Threatened Taxa 2023

The sphingid moth larvae are voracious defoliators of several crops. present study was conducted to investigate damage Acherontia styx on Jasmine, their seasonal incidence, and bioecology. Larval instars fed jasmine leaves flowers, with the highest defoliation being 35% flower 47% during September. lifecycle consisted egg, five larval instars, pupal, adult stages. eggs were pearly white in colo...

Journal: :Publications of the Astronomical Society of Japan 2021

The corrugated horn is a high performance feed often used in radio telescopes. There has been growing demand for wideband optics and horns millimeter submillimeter-wave receivers. It improves the observation efficiency allows us to observe important emission lines such as CO multiple excited states simultaneously. However, millimeter/submillimeter band, it challenging create conical with fracti...

Journal: :IEEE Open Journal of Antennas and Propagation 2021

Mode-converting metasurfaces are passive, lossless devices that can be designed to transform a set of incident modes desired transmitted modes. In this paper, mode-converting utilized synthesize arbitrary, azimuthally-invariant TM apertures. The methods presented in work used design antennas meet specific near-field and far-field criteria unlike most which solely manipulate the far field. propo...

2006
R. C. Gupta S. P. Singh

A novel, potential and efficient microwave direct contact hyperthermia applicator referred to as water-loaded box-horn for therapeutic heating of bio-medium is designed and developed at 915 and 2450 MHz. Also, theoretical expressions for fields in bio-medium as produced by a direct contact box-horn applicator have been derived using plane wave spectral technique. The box-horn is a special type ...

2015
R. Shane Tubbs Amit Sharma Marios Loukas Aaron Cohen-Gadol

BACKGROUND The location of the temporal horn is important to neurosurgeons during procedures such as amygdalohippocampectomy and intraventricular electrode placement for temporal lobe seizure monitoring. However, sometimes the temporal horn is difficult to localize, especially without neuronavigation. The authors aimed to better localize this structure using superficial anatomic landmarks. ME...

Journal: :Brain research 2001
Y Yamazaki T Maeda G Someya S Wakisaka

The temporal and spatial expression pattern of Fos protein in spinal dorsal horn neurons was examined by immunohistochemistry in rats with chronic constriction injury (CCI) to the sciatic nerve. In normal animals, a few Fos-immunoreactive (-IR) neurons were detected in the dorsal horn of the lumbar spinal cord. Following induction of CCI, a very large number of Fos-IR neurons appeared in the sp...

Journal: :Discrete Applied Mathematics 1999
Thomas Eiter Toshihide Ibaraki Kazuhisa Makino

Partially defined Boolean functions (pdBf) , where are disjoint sets of true and false vectors, generalize total Boolean functions by allowing that the function values on some input vectors are unknown. The main issue with pdBfs is the extension problem, which is deciding, given a pdBf, whether it is interpolated by a function from a given class of total Boolean functions, and computing a formu...

Journal: :Iet Microwaves Antennas & Propagation 2022

The design strategy to stabilise the phase centre (PC) of conventional horn antenna using a shaped dielectric rod is presented for aperture efficiency improvement space-fed antennas. In most practical antennas, PC location has significant variations with frequency leading error loss and reduction over bandwidth interest. To overcome this drawback, based on physical reasoning, rods appropriate e...

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