2,732 research outputs found
Some Normality Criteria
In this article we prove some normality criteria for a family of meromorphic
functions which involves sharing of a non-zero value by certain differential
monomials generated by the members of the family. These results generalizes
some of the results of Schwick.Comment: 16 Pages. Comments are welcome, Communicate
On a Theorem of Schwick
Let D be a domain, n, k be positive integers and n >= K+3. Let F be a family
of functions meromorphic in D. If each f in F satisfies (f^n)^(k) not equal to
1 for z in D, then F is normal family. This result was proved by Schwick. In
this paper we extend this result.Comment: Comments are welcom
A Criterion for quasi normality in
In this article, we give a Zalcman type renormalization result for the
quasinormality of a family of holomorphic functions on a domain in
that takes values in a complete complex Hermitian manifold.Comment: 11 page
Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars-III
This is continuation of our programme to search for the elusive radio-quiet
BL Lacs, by carrying out a systematic search for intranight optical variability
(INOV) in a subset of `weak-line quasars' which are already designated as
`high-confidence BL Lac candidate' and are also known to be radio-quiet. For 6
such radio-quiet weak-line quasars (RQWLQs), we present here new INOV
observations taken in 11 sessions of duration >3 hours each. Combining these
data with our previously published INOV monitoring of RQWLQs in 19 sessions
yields INOV observations for a set of 15 RQWLQs monitored in 30 sessions, each
lasting more than 3 hours. The 30 differential light curves, thus obtained for
the 15 RQWLQs, were subjected to a statistical analysis using the F-test, and
the deduced INOV characteristics of the RQWLQs then compared with those
published recently for several prominent AGN classes, also applying the F-test.
From our existing INOV observations, there is a hint that RQWLQs in our sample
show a significantly higher INOV duty cycle than radio-quiet quasars and radio
lobe-dominated quasars. Two sessions when we have detected strong (blazar-like)
INOV for RQWLQs are pointed out, and these two RQWLQs are therefore the best
known candidates for radio-quiet BL Lacs, deserving to be pursued. For a proper
comparison with the INOV properties already established for (brighter) members
of several prominent classes of AGN, a factor of 2-3 improvement in the INOV
detection threshold for the RQWLQs is needed and it would be very interesting
to check if that would yield a significantly higher estimate for INOV duty
cycle than is found here.Comment: 9 pages, 1 figure and 4 tables, accepted for publication in MNRAS
main journal. arXiv admin note: text overlap with arXiv:1212.5384,
arXiv:1403.744
Subconvexity bound for L-functions: \lowercase{t}-aspect
Let be a holomorphic Hecke eigenform or a Hecke-Maass cusp form for the
full modular group . In this paper we shall use circle
method to prove the Weyl exponent for -functions. We shall prove
that
for any $\epsilon > 0.
Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars-IV
We report an extension of our program to search for radio-quiet BL Lac
candidates using intra-night optical variability (INOV) as a probe. The present
INOV observations cover a well-defined representative set of 10 `radio-quiet
weak-emission-line quasars' (RQWLQs), selected from a newly published sample of
46 such sources, derived from the Sloan Digital Sky Survey (Data release 7).
Intra-night CCD monitoring of the 10 RQWLQs was carried out in 18 sessions
lasting at least 3.5 hours. For each session, differential light curves (DLCs)
of the target RQWLQ were derived relative to two steady comparison stars
monitored simultaneously. Combining these new data with those already published
by us for 15 RQWLQs monitored in 30 sessions, we estimate an INOV duty cycle of
for the RQWLQs, which appears inconsistent with BL Lacs. However,
the observed INOV events (which occurred in just two of the sessions) are
strong (with a fractional variability amplitude 10\%), hence
blazar-like. We briefly point out the prospects of an appreciable rise in the
estimated INOV duty cycle for RQWLQs with a relatively modest increase in
sensitivity for monitoring these rather faint objects.Comment: 8 pages, 2 figures, accepted in MNRA
On Heterogeneous Regenerating Codes and Capacity of Distributed Storage Systems
Heterogeneous Distributed Storage Systems (DSS) are close to real world
applications for data storage. Internet caching system and peer-to-peer storage
clouds are the examples of such DSS. In this work, we calculate the capacity
formula for such systems where each node store different number of packets and
each having a different repair bandwidth (node can be repaired by contacting a
specific set of nodes). The tradeoff curve between storage and repair bandwidth
is studied for such heterogeneous DSS. By analyzing the capacity formula new
minimum bandwidth regenerating (MBR) and minimum storage regenerating (MBR)
points are obtained on the curve. It is shown that in some cases these are
better than the homogeneous DSS.Comment: submitted to conference Netcod 2014, 3 figures, 5 page
Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars-II
This is continuation of our search for the elusive radio-quiet blazars, by
carrying out a systematic programme to detect intranight optical variability
(INOV) in a subset of `Weak-Lines-Quasars' (WLQs) which are designated as `high
confidence BL Lac candidates' and are known to be radio-quiet. For 10 such
RQWLQs, we present here the INOV observations taken in 16 sessions of durations
> 3.5 hours each. Combining these data with our previously published INOV
monitoring of RQWLQs in 13 sessions, gives a set of INOV observations of 15
RQWLQs monitored in 29 sessions each lasting more than 3.5 hours. The 29
differential light curves (DLCs), thus obtained for the 15 RQWLQs, were
subjected to an statistical analysis using the F-test and the deduced INOV
characteristics of the RQWLQs are compared with those published recently for
several prominent AGN classes, also using the F-test. However, since the RQWLQs
are generally 1-2 magnitudes fainter, a rigorous comparison has to wait for
somewhat more sensitive INOV observations than those presented here. Based on
our existing INOV observations, it seems that RQWLQs in our sample show a
significantly higher INOV duty cycle than radio-quiet quasars and radio
lobe-dominated quasars. Two sessions when we detected rather strong
(blazar-like) INOV for RQWLQs are pointed out and both these RQWLQs are
therefore candidates for radio-quiet BL Lacs.Comment: 8 pages, 2 figures and 3 tables, accepted for publication in MNRAS
main journa
A Mathematical Model of Foreign Capital Inflow
The paper models foreign capital inflow from the developed to the developing
countries in a stochastic dynamic programming (SDP) framework. Under some
regularity conditions, the existence of the solutions to the SDP problem is
proved and they are then obtained by numerical technique because of the
non-linearity of the related functions. A number of comparative dynamic
analyses explore the impact of parameters of the model on dynamic paths of
capital inflow, interest rate in the international loan market and the exchange
rate.Comment: 32 pages, 4 sets of figures each set consists of capital inflow,
interest rate and exchange rat
Synthesis and characterization of novel benzimidazole embedded 1,3,5-trisubstituted pyrazolines as antimicrobial agents
Efficient syntheses of some new substituted pyrazoline derivatives linked to
substituted benzimidazole scaffold were performed by multistep reaction
sequences. All the synthesized compounds were characterized using elemental
analysis and spectral studies (IR, 1D/2D NMR techniques and mass spectrometry).
The synthesized compounds were screened for their antimicrobial activity
against selected Gram-positive and Gram-negative bacteria, and fungi strain.
The compounds with halo substituted phenyl group at C5 of the 1-phenyl
pyrazoline ring (15, 16 and 17) showed significant antibacterial activity.
Among the screened compounds, 17 showed most potent inhibitory activity (MIC =
64 {\mu}g mL-1) against a bacterial strain. The tested compounds werefound to
be almost inactive against the fungal strain C. albicans, apart from
pyrazoline-1-carbothiomide 21, which was moderately active.Comment: 9 Pages,2 figures, 1 tabl
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