21 research outputs found
Oxygen mass transfer studies on batch cultivation of P. aeruginosa in a biocalorimeter
In the present work volumetric mass transfer coefficient (kLa) was
investigated during batch cultivations of Pseudomonas aeruginosa on a
nutrient media. The effects of process variables (viz. impeller speed,
oxygen flow and geometry of impeller) on the volumetric mass transfer
coefficient of oxygen, kLa, in a biocalorimeter (Bio-RC1) was
investigated and reported in this research work. The experimental data
have been analyzed employing MATLAB to obtain the influences of the
process parameters on kLa. An attempt was made to correlate volumetric
mass transfer coefficient with metabolic heat production rate at
optimized process conditions. The correlation reported in this work
would be useful to control and scale up of bioprocesses
Privacy Aware Experiments without Cookies
Consider two brands that want to jointly test alternate web experiences for
their customers with an A/B test. Such collaborative tests are today enabled
using \textit{third-party cookies}, where each brand has information on the
identity of visitors to another website. With the imminent elimination of
third-party cookies, such A/B tests will become untenable. We propose a
two-stage experimental design, where the two brands only need to agree on
high-level aggregate parameters of the experiment to test the alternate
experiences. Our design respects the privacy of customers. We propose an
estimater of the Average Treatment Effect (ATE), show that it is unbiased and
theoretically compute its variance. Our demonstration describes how a marketer
for a brand can design such an experiment and analyze the results. On real and
simulated data, we show that the approach provides valid estimate of the ATE
with low variance and is robust to the proportion of visitors overlapping
across the brands.Comment: Technical repor
Discovering salient objects from videos using spatiotemporal salient region detection
Detecting salient objects from images and videos has many useful applications in computer vision. In this paper, a novel spatiotemporal salient region detection approach is proposed. The proposed approach computes spatiotemporal saliency by estimating spatial and temporal saliencies separately. The spatial saliency of an image is computed by estimating the color contrast cue and color distribution cue. The estimations of these cues exploit the patch level and region level image abstractions in a unified way. The aforementioned cues are fused to compute an initial spatial saliency map, which is further refined to emphasize saliencies of objects uniformly, and to suppress saliencies of background noises. The final spatial saliency map is computed by integrating the refined saliency map with center prior map. The temporal saliency is computed based on local and global temporal saliencies estimations using patch level optical flow abstractions. Both local and global temporal saliencies are fused to compute the temporal saliency. Finally, spatial and temporal saliencies are integrated to generate a spatiotemporal saliency map. The proposed temporal and spatiotemporal salient region detection approaches are extensively experimented on challenging salient object detection video datasets. The experimental results show that the proposed approaches achieve an improved performance than several state-of-the-art saliency detection approaches. In order to compensate different needs in respect of the speed/accuracy tradeoff, faster variants of the spatial, temporal and spatiotemporal salient region detection approaches are also presented in this paper
Parametrizations of Inclusive Cross Sections for Pion Production in Proton-Proton Collisions
Accurate knowledge of cross sections for pion production in proton-proton
collisions finds wide application in particle physics, astrophysics, cosmic ray
physics and space radiation problems, especially in situations where an
incident proton is transported through some medium, and one requires knowledge
of the output particle spectrum given the input spectrum. In such cases
accurate parametrizations of the cross sections are desired. In this paper we
review much of the experimental data and compare to a wide variety of different
cross section parametrizations. In so doing, we provide parametrizations of
neutral and charged pion cross sections which provide a very accurate
description of the experimental data. Lorentz invariant differential cross
sections, spectral distributions and total cross section parametrizations are
presented.Comment: 32 pages with 15 figures. Published in Physical Review D62, 094030.
File includes 6 tex files. The main file is paper.tex which has include
statements refering to the rest. figures are in graphs.di
Phase I study of MLN8237—investigational Aurora A kinase inhibitor—in relapsed/refractory multiple myeloma, Non-Hodgkin lymphoma and chronic lymphocytic leukemia
Probabilistic linear function approximation for value-based reinforcement learning
Reinforcement learning (RL) is a computational framework for learning sequential decision strategies from the interaction of an agent with an unknown dynamic environment. This thesis focuses on value-based reinforcement learning methods, which rely on computing utility values for different behavior strategies that can be adopted by the agent. Real-world complex problems involve very large discrete or continuous state spaces where the use of approximate methods is required. It has been observed that subtle differences in the approximate methods result in very different theoretical properties and empirical behavior. In this thesis, we propose a new framework for discussing many popular function approximation methods, called Probabilistic Linear Function Approximation. This allows us to highlight the key differences of several approximation algorithms used in RL
Oxygen mass transfer studies on batch cultivation of P. aeruginosa in a biocalorimeter
In the present work volumetric mass transfer coefficient (kLa) was
investigated during batch cultivations of Pseudomonas aeruginosa on a
nutrient media. The effects of process variables (viz. impeller speed,
oxygen flow and geometry of impeller) on the volumetric mass transfer
coefficient of oxygen, kLa, in a biocalorimeter (Bio-RC1) was
investigated and reported in this research work. The experimental data
have been analyzed employing MATLAB to obtain the influences of the
process parameters on kLa. An attempt was made to correlate volumetric
mass transfer coefficient with metabolic heat production rate at
optimized process conditions. The correlation reported in this work
would be useful to control and scale up of bioprocesses
Impact of atrioventricular compliance in rheumatic mitral stenosis patients undergoing percutaneous mitral balloon valvotomy
Next Generation of 100-μm-Pitch Wafer-Level Packaging and Assembly for Systems-on-Package
According to the latest ITRS roadmap, the pitch of area array packages is expected to decrease to 100 um by 2009. Simultaneously, the electrical performance of these interconnections needs to be improved to support data rates in excess of 10 Gbps, while guaranteeing thermomechanical reliability and lowering the cost. These requirements are challenging, thus, needing innovative interconnection designs and technologies. This paper describes the development of three interconnection schemes for wafer-level packages (WLPs) at 100-µm-pitch, involving rigid, compliant, and semicompliant interconnection technologies, extending the state of the art in each. Extensive electrical and mechanical modeling was carried out to optimize the geometry of the interconnections with respect to electrical performance and thermomechanical reliability. It was found that the requirements of electrical performance often conflict with those of thermomechanical reliability and the final “optimum” design is a tradeoff between the two. For the three interconnection schemes proposed, it was found that the electrical requirements can be met fairly well but acceptable mechanical reliability may require organic boards with coefficient of thermal expansion of 10 ppm/K or lower