133 research outputs found
Adsorption Behaviour of Diisopropyl Flourophosphate on Whetlerite Carbon
Breakthrough behaviour of diisopropyl florophosphate (DFP) vapour on whetlerite carbon has been studied by using modified wheeler equation. The kinetic saturation capacity and pseudo first order rate constant with respect to the effect of various parameters such as bed weight, flow rate, concentration and temperature were correlated. The results of this study indicate that breakthrough time is increased with increase of the bed weight of carbon. Rate constant value increases as flow rate increases, while kinetic saturation capacity value is invariable.Defence Science Journal, 2013, 63(5), pp.473-477, DOI:http://dx.doi.org/10.14429/dsj.63.251
Analyzing the potential benefits of CDN augmentation strategies for internet video workloads
Video viewership over the Internet is rising rapidly, and market pre-dictions suggest that video will comprise over 90 % of Internet traf-fic in the next few years. At the same time, there have been signs that the Content Delivery Network (CDN) infrastructure is being stressed by ever-increasing amounts of video traffic. To meet these growing demands, the CDN infrastructure must be designed, pro-visioned and managed appropriately. Federated telco-CDNs and hybrid P2P-CDNs are two content delivery infrastructure designs that have gained significant industry attention recently. We ob-served several user access patterns that have important implica-tions to these two designs in our unique dataset consisting of 30 million video sessions spanning around two months of video view-ership from two large Internet video providers. These include par-tial interest in content, regional interests, temporal shift in peak load and patterns in evolution of interest. We analyze the impact of our findings on these two designs by performing a large scale measurement study. Surprisingly, we find significant amount of synchronous viewing behavior for Video On Demand (VOD) con-tent, which makes hybrid P2P-CDN approach feasible for VOD and suggest new strategies for CDNs to reduce their infrastructure costs. We also find that federation can significantly reduce telco-CDN provisioning costs by as much as 95%
Higher order antibunching in intermediate states
Since the introduction of binomial state as an intermediate state, different
intermediate states have been proposed. Different nonclassical effects have
also been reported in these intermediate states. But till now higher order
antibunching or higher order subpoissonian photon statistics is predicted only
in one type of intermediate state, namely shadowed negative binomial state.
Recently we have shown the existence of higher order antibunching in some
simple nonlinear optical processes to establish that higher order antibunching
is not a rare phenomenon (J. Phys. B 39 (2006) 1137). To establish our earlier
claim further, here we have shown that the higher order antibunching can be
seen in different intermediate states, such as binomial state, reciprocal
binomial state, hypergeometric state, generalized binomial state, negative
binomial state and photon added coherent state. We have studied the possibility
of observing the higher order subpoissonian photon statistics in different
limits of intermediate states. The effect of different control parameters have
also been studied in this connection and it has been shown that the depth of
nonclassicality can be tuned by controlling various physical parameters.Comment: 12 Pages LaTeX 2e, 11 figure
Quantum properties of the parametric amplifier with and without pumping field fluctuations
The parametric amplifier with and without the pumping fluctuations of
coupling function is considered when the fields are initially prepared in
coherent light.
The pumping fluctuations are assumed to be normally distributed with
time-dependent variance. The effects of antibunching and anticorrelation of
photons on the photon distribution, correlation between modes and factorial
moments are demonstrated. A possible enhancement of photon antibunching for
certain values of initial mean photon numbers is shown and discussed. We have
shown also that new states (called modified squeezed vacuum states or even
thermal states) can be generated from such an interaction. Further, we have
demonstrated that the sum photon-number distribution can exhibit collapses and
revivals in the photon-number domain somewhat similar to those known in the
Jaynes-Cummings model.Comment: 17 pages, 6figure
Polyimide Electrode-Based Electrical Stimulation Impedes Early Stage Muscle Graft Regeneration
Given the increasing use of regenerative free muscle flaps for various reconstructive procedures and neuroprosthetic applications, there is great interest and value in their enhanced regeneration, revascularization, and reinnervation for improved functional recovery. Here, we implant polyimide-based mircroelectrodes on free flap grafts and perform electrical stimulation for 6 weeks in a murine model. Using electrophysiological and histological assessments, we compare outcomes of stimulated grafts with unstimulated control grafts. We find delayed reinnervation and abnormal electromyographic (EMG) signals, with significantly more polyphasia, lower compound muscle action potentials and higher fatigability in stimulated animals. These metrics are suggestive of myopathy in the free flap grafts stimulated with the electrode. Additionally, active inflammatory processes and partial necrosis are observed in grafts stimulated with the implanted electrode. The results suggest that under this treatment protocol, implanted epimysial electrodes and electrical stimulation to deinnervated, and devascularized flaps during the early recovery phase may be detrimental to regeneration. Future work should determine the optimal implantation and stimulation window for accelerating free muscle graft regeneration
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