148 research outputs found
Large Solutions of Semilinear Elliptic Equations with Nonlinear Gradient Terms
We show that large positive solutions exist for the equation ( P ± ) : Δ u ± | ∇ u | q = p ( x ) u γ in Ω ⫅ R N ( N ≥ 3 ) for appropriate choices of γ \u3e 1 , q \u3e 0 in which the domain Ω is either bounded or equal to R N . The nonnegative function p is continuous and may vanish on large parts of Ω . If Ω = R N , then p must satisfy a decay condition as | x | → ∞ . For ( P + ) , the decay condition is simply ∫ 0 ∞ t ϕ ( t ) d t \u3c ∞ , where ϕ ( t ) = max | x | = t p ( x ) . For ( P − ) , we require that t 2 + β ϕ ( t ) be bounded above for some positive β . Furthermore, we show that the given conditions on γ and p are nearly optimal for equation ( P + ) in that no large solutions exist if either γ ≤ 1 or the function p has compact support in Ω
Subaru and Keck Observations of the Peculiar Type Ia Supernova 2006gz at Late Phases
Recently, a few peculiar Type Ia supernovae (SNe) that show exceptionally
large peak luminosity have been discovered. Their luminosity requires more than
1 Msun of 56Ni ejected during the explosion, suggesting that they might have
originated from super-Chandrasekhar mass white dwarfs. However, the nature of
these objects is not yet well understood. In particular, no data have been
taken at late phases, about one year after the explosion. We report on Subaru
and Keck optical spectroscopic and photometric observations of the SN Ia
2006gz, which had been classified as being one of these "overluminous" SNe Ia.
The late-time behavior is distinctly different from that of normal SNe Ia,
reinforcing the argument that SN 2006gz belongs to a different subclass than
normal SNe Ia. However, the peculiar features found at late times are not
readily connected to a large amount of 56Ni; the SN is faint, and it lacks [Fe
II] and [Fe III] emission. If the bulk of the radioactive energy escapes the SN
ejecta as visual light, as is the case in normal SNe Ia, the mass of 56Ni does
not exceed ~ 0.3 Msun. We discuss several possibilities to remedy the problem.
With the limited observations, however, we are unable to conclusively identify
which process is responsible. An interesting possibility is that the bulk of
the emission might be shifted to longer wavelengths, unlike the case in other
SNe Ia, which might be related to dense C-rich regions as indicated by the
early-phase data. Alternatively, it might be the case that SN 2006gz, though
peculiar, was actually not substantially overluminous at early times.Comment: 8 pages, 6 figures, 4 tables. Accepted for publication in The
Astrophysical Journa
The Vehicle, Spring 1997
Vol. 38, No. 2
Table of Contents
Poetry:
Don QuixotePatrick Scanlanpage 1
Last SupperChristine Starrpage 1
Marriage VowsKristopher Clausingpage 2
The LibraryPatrick Lairpage 4
GuruJohn Dylan McNeilpage 5
Tripping in OzKim Evanspage 5
TranceStephanie Kavanaughpage 6
The CleftEmilie Roypage 7
FlannelAmanda Watsonpage 8
Strip PokerEbben Moorepage 8
IceJohn Dylan McNeilpage 9
ChloeMichael Kawapage 11
OrchardCarmella Cosenzapage 12
Jenn & Cookie MonsterJacob Tolbertpage 13
Barry ManilowKatie Wrightpage 14
GoodbyesShannon Goodallpage 15
Prose:
Alice (A Short, Short Story)Carmella Cosenzapage 17
UntitledJoe Robesonpage 17
A New World AloneKendall W. Baumanpage 22
Biographiespage 35https://thekeep.eiu.edu/vehicle/1069/thumbnail.jp
Designing all-graphene nanojunctions by covalent functionalization
We investigated theoretically the effect of covalent edge functionalization,
with organic functional groups, on the electronic properties of graphene
nanostructures and nano-junctions. Our analysis shows that functionalization
can be designed to tune electron affinities and ionization potentials of
graphene flakes, and to control the energy alignment of frontier orbitals in
nanometer-wide graphene junctions. The stability of the proposed mechanism is
discussed with respect to the functional groups, their number as well as the
width of graphene nanostructures. The results of our work indicate that
different level alignments can be obtained and engineered in order to realize
stable all-graphene nanodevices
Mature autologous dendritic cell vaccines in advanced non-small cell lung cancer: a phase I pilot study
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Background: Overall therapeutic outcomes of advanced non-small-cell lung cancer (NSCLC) are poor. The dendritic cell (DC) immunotherapy has been developed as a new strategy for the treatment of lung cancer. The purpose of this study was to evaluate the feasibility, safety and immunologic responses in use in mature, antigen-pulsed autologous DC vaccine in NSCLC patients. Methods: Five HLA-A2 patients with inoperable stage III or IV NSCLC were selected to receive two doses of 5 x 107 DC cells administered subcutaneous and intravenously two times at two week intervals. The immunologic response, safety and tolerability to the vaccine were evaluated by the lymphoproliferation assay and clinical and laboratorial evolution, respectively. Results: The dose of the vaccine has shown to be safe and well tolerated. The lymphoproliferation assay showed an improvement in the specific immune response after the immunization, with a significant response after the second dose (p = 0.005). This response was not long lasting and a tendency to reduction two weeks after the second dose of the vaccine was observed. Two patients had a survival almost twice greater than the expected average and were the only ones that expressed HER-2 and CEA together. Conclusion: Despite the small sample size, the results on the immune response, safety and tolerability, combined with the results of other studies, are encouraging to the conduction of a large clinical trial with multiples doses in patients with early lung cancer who underwent surgical treatment.30Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Department of Radiology of the Hospital Estadual Sumare UNICAMPSCOGConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)CNPq [401327/05-1
Type Ia Supernovae as Stellar Endpoints and Cosmological Tools
Empirically, Type Ia supernovae are the most useful, precise, and mature
tools for determining astronomical distances. Acting as calibrated candles they
revealed the presence of dark energy and are being used to measure its
properties. However, the nature of the SN Ia explosion, and the progenitors
involved, have remained elusive, even after seven decades of research. But now
new large surveys are bringing about a paradigm shift --- we can finally
compare samples of hundreds of supernovae to isolate critical variables. As a
result of this, and advances in modeling, breakthroughs in understanding all
aspects of SNe Ia are finally starting to happen.Comment: Invited review for Nature Communications. Final published version.
Shortened, update
Effect of sampling effort and sampling frequency on the composition of the planktonic crustacean assemblage: a case study of the river Danube
Although numerous studies have focused
on the seasonal dynamics of riverine zooplankton,
little is known about its short-term
variation. In order to examine the effects of sampling
frequency and sampling effort, microcrustacean
samples were collected at daily intervals
between 13 June and 21 July of 2007 in a parapotamal
side arm of the river Danube, Hungary.
Samples were also taken at biweekly intervals
from November 2006 to May 2008. After presenting
the community dynamics, the effect of
sampling effort was evaluated with two different
methods; the minimal sample size was also estimated.
We introduced a single index (potential
dynamic information loss; to determine the potential
loss of information when sampling frequency
is reduced. The formula was calculated for the total abundance, densities of the dominant taxa, adult/larva ratios of copepods and for two different diversity measures. Results suggest that abundances may experience notable fluctuations even within 1 week, as do diversities and adult/larva ratios
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