Shabnumā-wa-Rūznumā A Rare Astronomical Instrument Extant in Two Specimens

a cross-comparative dtudy between two textbook series in terms of the presentation of politeness

چکیده ندارد.

Two-dimensional silicon vidicon astronomical photometer.

We have developed and successfully used an integrating two-dimensional silicon diode array vidicon photometer which is exceptionally well suited for use with telescopes. The video signal is read out from the 1-cm silicon target of the vidicon through a current mode preamplifier and then converted to digital form and stored on magnetic tape. The 256 x 256 element frames are recorded at 20,000 ei...

Case Report: Permanent Maxillary First Molar with Two Roots and Two Canals: A Rare Case Report

Abstract: Human maxillary first molars are usually considered as three-rooted teeth with four root canals for the presence of a second canal in the Mesio Buccal root (MB2). In addition, lateral ramifications and apical delta of the root canal system may frequently occur, increasing the probability of leaving untreated spaces after the root canal therapy. A thorough knowledge of root canal mor...

Congental Glucose- Galactose Malabsorption a Rare Cause of Diarrhea in Infancy Period: Report of Two Cases

Improved Mirror Coatings for use in the Lyman Ultraviolet to Enhance Astronomical Instrument Capabilities

This paper will describe efforts at developing broadband mirror coatings with high performance that will extend from infrared wavelengths down to the Far-Ultraviolet (FUV) spectral region. These mirror coatings would be realized by passivating the surface of freshly made aluminum coatings with XeF2 gas in order to form a thin AlF3 overcoat that will protect the aluminum from oxidation and, henc...

a synchronic and diachronic approach to the change route of address terms in the two recent centuries of persian language

terms of address as an important linguistics items provide valuable information about the interlocutors, their relationship and their circumstances. this study was done to investigate the change route of persian address terms in the two recent centuries including three historical periods of qajar, pahlavi and after the islamic revolution. data were extracted from a corpus consisting 24 novels w...