241 research outputs found
Development of composite calibration standard for quantitative NDE by ultrasound and thermography
No full textInspection of aircraft components for damage utilizing ultrasonic Non-Destructive Evaluation (NDE) is a time intensive endeavor. Additional time spent during aircraft inspections translates to added cost to the company performing them, and as such, reducing this expenditure is of great importance. There is also great variance in the calibration samples from one entity to another due to a lack of a common calibration set. By characterizing damage types, we can condense the required calibration sets and reduce the time required to perform calibration while also providing procedures for the fabrication of these standard sets. We present here our effort to fabricate composite samples with known defects and quantify the size and location of defects, such as delaminations, and impact damage. Ultrasonic and Thermographic images are digitally enhanced to accurately measure the damage size. Ultrasonic NDE is compared with thermography.This proceeding may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.
This proceeding appeared in Dayal, Vinay, Zach G. Benedict, Nishtha Bhatnagar, and Adam G. Harper. "Development of composite calibration standard for quantitative NDE by ultrasound and thermography." In AIP Conference Proceedings, vol. 1949, no. 1, p. 060006. AIP Publishing LLC, 2018, and may be found at
DOI: 10.1063/1.5031552.
Copyright 2018 The Author(s).
Posted with permission
Universal Statistical Properties of Inertial-particle Trajectories in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence
No full textWe obtain new universal statistical properties of heavy-particle trajectories in three-dimensional, statistically steady, homogeneous, and isotropic turbulent flows by direct numerical simulations. We show that the probability distribution functions (PDFs) P(Φ), of the angle Φ between the Eulerian velocity u and the particle velocity v, at a point and time, scales as P(Φ) ∼Φ−, with a new universal exponent ≃ 4
Rabies DNA vaccine encoding lysosome-targeted glycoprotein supplemented with Emulsigen-D confers complete protection in preexposure and postexposure studies in BALB/c mice
No full textThe worldwide incidence of rabies and the inability of currently used vaccination strategies to provide highly potent and cost-effective therapy indicate the need for an improved rabies vaccine. Thus, DNA vaccine based on lysosome-targeted glycoprotein of the rabies virus was evaluated in BALB/c mice. It imparted partial protection (60%) against challenge with 20 LD50 of the challenge virus standard (CVS) strain of rabies virus. To improve the outcome of vaccination, to ultimately enhance the immune response, we investigated different routes for DNA vaccine delivery, varied doses of DNA, and the influence of adjuvant supplementation. The highest immune response pertaining to IgG antibody titer, with a predominantly IgG1/IgG2a subclass distribution, effective cellular immunity, and a high level of rabies virus neutralizing antibodies (RVNAs) was attained by the optimized DNA vaccine formulation comprising intramuscular administration of 100 µg of DNA vaccine supplemented with Emulsigen®-D. In preexposure prophylaxis, a 3-dose regimen of this formulation generated a high RVNA titer (32 IU/ml) and conferred complete protection against challenge with 20 LD50 of CVS. For postexposure efficacy analysis, rabies was experimentally induced with 50 LD50 of CVS. Subsequent therapy with 5 doses of the formulation completely prevented rabies in BALB/c mice, which maintained protective RVNA titers of 4 IU/ml. The World Health Organization recommended rabies protective titer threshold is 0.5 IU/ml. Thus, this optimized DNA vaccine formulation provides an avenue for preventing and controlling rabies.-Kaur, M., Saxena, A., Rai, A., and Bhatnagar, R. Rabies DNA vaccine encoding lysosome-targeted glycoprotein supplemented with Emulsigen-D confers complete protection in preexposure and postexposure studies in BALB/c mice
What drives Indian Non-SOE FDI into Africa?
No full textThis paper puts FDI received by Africa from Indian enterprises that are not owned by State owned enterprises (non-SOE) under the empirical lens, placing it within a broader mandate of increasing Indo-African relations beyond trade. The use of international business literature for a qualitative regression analysis using panel data for 2008-18 shines a light on the host country factors that drive FDI to Africa. These include country alliances, GDP and net overseas development assistance of host African countries. This analysis contributes to the sparse literature on African FDI inflows from developing countries like India. It also pioneers the distinction between Indian SOEs and non-SOEs in an empirical analysis
Intraoral excision of large submental dermoid
No full textSublingual dermoids are the rarest forms of craniofacial dermoids mostly seen in young individuals. Excision of large and deep submental dermoid is generally done via extraoral approach scarring the most prominent part of the face, which can lead to post operative scar hypertrophy and hyperpigmentation especially in non-Caucasian races. Presence of such scars leads to adverse psychological effects in young individuals. Excision via intraoral route, although technically demanding, can be simplified using basic principles of plastic surgery leading to optimal aesthetic outcome with least downtime. We excised a large sublingual dermoid extending deep to the mylohyoid muscle through intraoral approach with excellent cosmetic results. Clinicians dealing with such lesions should keep these principals in their armamentarium when dealing with this rare subset of cases
Performance and hardware complexity analysis of programmable radio platform for MIMO OFDM based WLAN systems
No full textEmerging wireless technologies and standards present a design space with multiple dimensions in terms of time, physical hardware space, and technology trends. Efficient evaluation of a desired combination of these dimensions to support multiple technologies and standards presents a significant challenge. We study the feasibility of a multiprotocol architecture without sacrificing the Quality of Service. An architecture facilitating such a mechanism can be implemented at different layers in the network stack with each layer offering a tradeoff between complexity and latency. Careful analysis of the physical layer reveals that most blocks of the transceiver can be reused for different protocols without significant architectural change. In addition to the feasibility analysis, we also identify common blocks in the network stack that could be possibly reused buying us significant hardware gains without sacrificing the aggregate system throughput. Our study presents the gate count complexity and the performance analysis of programmable radio architecture with the 802.11n (Draft 3.0) MIMO-OFDM based protocol stream and 802.11a OFDM based WLAN protocol stream. In this thesis, we demonstrate that multiple protocols can be supported using the same hardware under acceptable latency requirements. Complexity of the system in terms of gate count has been determined. It has been found that for shorter frame sizes, it is better to process less number of OFDM symbols at a time. However, for larger frame sizes, it is beneficial to process large number (four to eight) of OFDM symbols at a time. Also, the minimum clock rate required to run the hardware, would vary depending upon the number of OFDM Symbols processed. The switching and multiplexing overhead of the programmable radio platform has also been investigated. Finally, our simulator is capable of evaluating bottlenecks, if any.M.S.Includes bibliographical references (p. 75-76)
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