3,109 research outputs found
Reviving the Macrobrachium rosenbergii (de Man) fishery in Vembanad Lake, India
In Vembanad Lake and its confluent rivers (Kerala, India), the catches of Macrobrachium rosenbergii (de Man) were reported to have dwindled to a mere 39 t in the 1980s from average landings of 300 t during the 1960s. This decline is due to the impact of a number of human interventions affecting the ecosystem and, hence, the stocks of M. rosenbergii. Monitoring of landings in 1994-1995 and 1995-1996 indicates an improvement in catches. This paper discusses the reasons for the decline and revival in stocks and suggestions for their replenishment
Design And Implementation Of Up-Conversion Mixer And Lc-Quadrature Oscillator For IEEE 802.11a WLAN Transmitter Application Utilizing 0.18 Pm CMOS Technology [TK7871.99.M44 H279 2008 f rb].
Perlumbaan implementasi litar terkamil radio, dengan kos yang rendah telah menggalakkan penggunaan teknologi CMOS.
The drive for cost reduction has led to the use of CMOS technology for highly integrated radios
Observability of Dark Matter Substructure with Pulsar Timing Correlations
Dark matter substructure on small scales is currently weakly constrained, and
its study may shed light on the nature of the dark matter. In this work we
study the gravitational effects of dark matter substructure on measured pulsar
phases in pulsar timing arrays (PTAs). Due to the stability of pulse phases
observed over several years, dark matter substructure around the Earth-pulsar
system can imprint discernible signatures in gravitational Doppler and Shapiro
delays. We compute pulsar phase correlations induced by general dark matter
substructure, and project constraints for a few models such as monochromatic
primordial black holes (PBHs), and Cold Dark Matter (CDM)-like NFW subhalos.
This work extends our previous analysis, which focused on static or single
transiting events, to a stochastic analysis of multiple transiting events. We
find that stochastic correlations, in a PTA similar to the Square Kilometer
Array (SKA), are uniquely powerful to constrain subhalos as light as , with concentrations as low as that predicted by standard
CDM.Comment: 45 pages, 12 figure
Singlet Scalar Resonances and the Diphoton Excess
ATLAS and CMS recently released the first results of searches for diphoton
resonances in 13 TeV data, revealing a modest excess at an invariant mass of
approximately 750 GeV. We find that it is generically possible that a singlet
scalar resonance is the origin of the excess while avoiding all other
constraints. We highlight some of the implications of this model and how
compatible it is with certain features of the experimental results. In
particular, we find that the very large total width of the excess is difficult
to explain with loop-level decays alone, pointing to other interesting bounds
and signals if this feature of the data persists. Finally we comment on the
robust Z-gamma signature that will always accompany the model we investigate
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