15,155 research outputs found
Efficient transient simulation of transmission lines
The paper focuses on revealing the salient structural aspects of a new transmission-line model with a view to exploiting them for gains in efficiency and accuracy. The new transmission-line model has as its basis the Telegraphers Equations but the manner of solution is what distinguishes the new approach from existing transmission-line simulation techniques. The technique is based on identifying natural modes of oscillation on the transmission line. The result is a model structure which can be tailored to the accuracy requirements of a simulation and which is amenable to tuning to fit measured admittance data
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The Pen Pal Project
In the early 1990âs, at a CUNY writing center conference, I heard about a pen
pal project between writing center tutors at an Eastern Pennsylvanian
University and children from an inner-city primary school. I was intrigued by
the description and filed the idea as one that I would like to try if ever I could
create the opportunity. By the fall of 2002, conditions and circumstances
seemed right to experiment at last with organizing a service-learning project
that would connect writing center tutors from my university with children from
an inner-city elementary school in a neighborhood that adjoins my universityâs.University Writing Cente
Relation between dust and radio luminosity in optically selected early type galaxies
We have surveyed an optical/IR selected sample of nearby E/S0 galaxies with
and without nuclear dust structures with the VLA at 3.6 cm to a sensitivity of
100 Jy. We can construct a Radio Luminosity Function (RLF) of these
galaxies to ~10^19 W/Hz and find that ~50% of these galaxies have AGNs at this
level. The space density of these AGNs equals that of starburst galaxies at
this luminosity. Several dust-free galaxies have low luminosity radio cores,
and their RLF is not significantly less than that of the dusty galaxies.Comment: 8 pages, 5 figures, accepted for publication in A&
Asymptotic expansion of the difference of two Mahler measures
We show that for almost every polynomial P(x,y) with complex coefficients,
the difference of the logarithmic Mahler measures of P(x,y) and P(x,x^n) can be
expanded in a type of formal series similar to an asymptotic power series
expansion in powers of 1/n. This generalizes a result of Boyd. We also show
that such an expansion is unique and provide a formula for its coefficients.
When P has algebraic coefficients, the coefficients in the expansion are linear
combinations of polylogarithms of algebraic numbers, with algebraic
coefficients.Comment: 25 pages. V2: Demoted previous Corollary 1 to a comment, after
realizing that Boyd had already proved that bit. Made small corrections to
Lemma 5, streamlined the proof of Lemma 9, and reworded section 9.
In Defense of His Holiness: The Cellini Plaque
The plaque depicting Cellini was donated to Gettysburg College by Reverend Jeremiah Zimmerman, Class of 1873, who later became a lecturer at Syracuse University and a frequent benefactor of Gettysburg College. A highly educated alum, Reverend Zimmerman became a clergyman and traveled the world for over a decade to further his studies, ranging from Asian culture to ancient coinage.
The plaque itself measures 32â x 26.75â x 2.5â, is of considerable weight for a porcelain plate, and is painted in the 19th century academic style to offer a dramatic interpretation of Benvenuto Celliniâs actions during the 1527 Sack of Rome. Specifically, the scene captures a dramatized (or even perhaps imagined) moment of Cellini outside the Castel SantâAngelo, the site of a fortress used by the Holy See to defend against outside invaders. [excerpt
SUB LEGE TO SUB GRATIA: An Iconographic Study of Van Eyckâs Annunciation
When the Archangel Gabriel descended from heaven to inform the Virgin Mary of her status as Godâs chosen vehicle for the birth of Jesus Christ, she was immediately filled with a sense of apprehension. Gabrielâs words, â...invenisti enim gratiam apud Deum [you have found favor with God],â reassured the Virgin that she would face no harm, and the scene of the Annunciation (what this moment has come to be called) has forever been immortalized in Christian belief as a watershed moment in the New Testament. While many Byzantine icons of the Medieval period sought to depict this snapshot in time and commemorate its importance, the most notable artistic examples of The Annunciation began to appear in the 15th century as the stylistic and symbolic traditions of the Renaissance began to take shape. While the works of artists such as Sandro Botticelli and Leonardo da Vinci have come to generally be known as the touchstones of this early Renaissance period, the talents and contributions of northern masters must not be overlooked
Pollution control legislation and the capital-appropriations- expenditure lag
Pollution ; Environmental policy
Earthtime
Quantification of geological time represents one of the fundamental challenges for earth
scientists as it permits the determination of rates of change, integration of disparate geological
datasets and assessment of coincidence (or lack thereof) so often central to hypothesis
testing. Knowing the age of certain rocks, be it a thick accumulation of volcanic lava or an
extinction layer, allows us to say something about causality. The extinction of the dinosaurs
at the end of the Cretaceous Period, âaboutâ 66 million years ago is the poster child for such
cause-and-effect arguments. At âaboutâ the same time, a large asteroid struck what is now the
Gulf of Mexico, however a series of voluminous volcanic eruptions in India are also âaboutâ the
same age. Both are viable kill mechanisms, and both are closely correlated in time with the
extinction, but knowing they are âaboutâ the same age is not good enough
Design methodology for a maximum sequence length MASH digital delta-sigma modulator
The paper proposes a novel structure for a MASH digital delta-sigma modulator (DDSM) in order to achieve a long sequence length. The expression for the sequence length is derived. The condition to produce the maximum sequence length is also stated. It is proved that the modulator output only
depends on the structure of the first-order error feedback
modulator (EFM1) which is the first stage of a Multi-stAge noise SHaping (MASH) modulator
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