News Article | September 7, 2016
A new device developed by researchers in India and Canada makes it possible to test food and bodies of water for bacterial contamination and produce conclusive results within minutes. In a study featured in the journal Optics Letters, scientists at the Indian Institute of Technology Kanpur (IITK) and the University of Quebec described how they were able to create a sensor capable of detecting bacterial pathogens, such as E. coli, in food and water sources. What makes the new technology revolutionary is that it allows researchers to confirm potential contamination within 15 to 20 minutes, which is much faster compared to the 24 hours or longer that it usually takes using other forms of diagnostics. "Using currently available technologies, which are mostly based on amplification of the sample, it takes several hours to days to detect the presence of bacteria," study co-author Saurabh Mani Tripathi said. "A fast and accurate detection alternative is, therefore, preferable over the existing technology." The new device makes use of viruses called bacteriophages that are known to latch onto certain forms of bacteria and kill them. The researchers bonded these microorganisms to the surface of optical fibers located at the center of the sensor. If the bacteriophages happen to grab any bacteria from a sample, the light on the optical fibers will change to signify that it is indeed contaminated. According to the researchers, they had to overcome limitations in using optical fibers to detect bacterial contamination. Such components are particularly vulnerable to changes in temperatures, which could make it difficult to get a concrete reading. To remedy this, the developers added an extra optical component to the sensor that would cancel out any potential shifts caused by temperature changes. This allows the device to be used in outdoor settings such as in testing water reservoirs on site. Researchers can adjust the new sensor in order to detect other bacterial strains aside from E. coli by simply changing the bacteriophages on the device. Tripathi and his colleagues are now working with Canadian company Security and Protection International to produce the device for commercial use. They hope to produce portable versions that will only cost a few thousand dollars. Bacterial contaminations continue to be one major public health concern. In 2015, several diners at Chipotle restaurants were sickened after eating food contaminated with E. coli. Cases of listeria and salmonella contaminations have also led to mass recalls of food and other products from retail stores and supermarkets. © 2017 Tech Times, All rights reserved. Do not reproduce without permission.
Sravanthi S.,IITK |
Malik J.N.,IITK |
Vikrama B.,Archaeological Survey of India
2012 14th International Conference on Ground Penetrating Radar, GPR 2012 | Year: 2012
Ahichhatra, is 20 km from Bareilly district, Uttar Pradesh, one of the most ancient settlements in India. It encompasses differential accumulation of cultural and structural deposits beginning from 2500BC - 1200AD. Ground Penetrating Radar (GPR) survey, involving both 2D & 3D profiling, helped in finding the buried structures at the site and also in understanding the pattern of occupancy. GPR and surface investigations carried out at Ahichhatra revealed slumped and displaced walls, warped surfaces, buried pavements and ruins of various foundations that spread over a wide range of area. These evidences are indicative of a large magnitude earthquake related damage and deformation, most likely having earthquake source in Himalayan foothills. ©2012 IEEE.
Rajeshwaran M.S.,IITK |
ASME 2015 Gas Turbine India Conference, GTINDIA 2015 | Year: 2015
The leading edge serrations are a type of passive flow control techniques in a compressor cascade. They are particularly attractive as they have been observed to increase the stall angle. This stall postponing character of the serrations is helpful in preventing compressor surge and widens the operational window of the compressor. Due to the simpler geometry of the serration type used in this study, it can be easily implemented onto the existing compressor blades. An experimental study on the flow modifications and losses due to these serrations are conducted in a linear cascade tunnel. The experiments are conducted on blades of NACA 65209 airfoil with and without leading edge serrations at Re of 120,000. Four serration profiles of various width and amplitude are compared. End plane measurements taken with 5-hole probe are studied for the better serration profile and surface flow visualizations are conducted to study the variation in the surface flow pattern on the suction side. The surface flow visualization reveals the presence of local recirculation zones and stream wise vortices created from each wave of the serration leading to flow attachment. These serrated blades have higher losses at 0 deg incidence; the reason for the same is found to be the flat leading edge surfaces formed from serration. © Copyright 2015 by ASME.
Agrawal S.,IITK |
Agrawal S.,PDPM Indian Institute of Information Technology, Design & Manufacturing |
Sengupta R.N.,IITK |
Shanker K.,IITK |
Kumar N.,PDPM Indian Institute of Information Technology, Design & Manufacturing
World Academy of Science, Engineering and Technology | Year: 2011
In this paper a simulation study is performed for a two stage serial supply chain having a retailer at the lower level and a supplier at the upper level. In order to see the supply chain dynamics; this paper studies the characteristics of upstream demand process when the end customer demand is considered as non stationary seasonal. This work is different from other research works in the sense that they do not consider seasonal behavior of demand of the products in their study. The code for simulation model is written in Matlab 6.5 and the characteristics of demand process has been studied using SAS package where we first identify and estimate the different parameters of the time series model of the order quantity/demand processes. Our results show that when the end customer demand is considered as non stationary seasonal ARIMA(0,1,1)×(0,1,1)12 process, the upstream demand process also follows an ARIMA (0,1,1)×(0,1,1)12 process. © 2011, WASET - World Academy of Science, Engineering and Technology. All Rights Reserved.
Gupta N.,IITK |
Tiwari B.N.,National Institute of Nuclear Physics, Italy |
Bellucci S.,National Institute of Nuclear Physics, Italy
International Journal of Electrical Power and Energy Systems | Year: 2013
This paper presents the intrinsic geometric model for the solution of power system planning and its operation. This problem is large-scale and nonlinear, in general. Thus, we have developed the intrinsic geometric model for the network reliability and voltage stability, and examined it for the two and three parameter systems. The robustness of the proposed model is illustrated by introducing variations of the network parameters. Exact analytical results show the accuracy as well as the efficiency of the proposed solution technique. © 2012 Elsevier Ltd. All rights reserved.
Mukerjee A.,IITK |
Neema K.,IITK |
International Conference Recent Advances in Natural Language Processing, RANLP | Year: 2011
Breaking away from traditional attempts at coreference resolution from discourse-only inputs, we try to do the same by constructing rich verb semantics from perceptual data, viz. a 2-D video. Using a bottom-up dynamic attention model and relative-motion-features between agents in the video, transitive verbs, their argument ordering etc. are learned through association with co-occurring adult commentary. This leads to learning of synonymous NP phrases as well as anaphora such as "it","each other" etc. This preliminary demonstration argues for a new approach to developmental NLP, with multi-modal semantics as the basis for computational language learning.