Health damage cost of automotive air pollution: Cost benefit analysis of fuel quality upgradation for Indian cities.

The paper has analysed the economic implication of judicial activism of the apex court of India in the regulation of automotive air pollution. It estimates the health damage cost of urban air pollution for 35 major urban agglomerations of India arising from automotive emissions and the savings that can be achieved by the regulation of fuel quality so as to conform to the Euro norms. It has used the results of some US based study and has applied the transfer of benefit method from the US to the Indian situation for the purpose. The paper finally makes a benefit cost analysis of refinery upgradation for such improvement of fuel quality.Urban air pollution ; Health damage cost ; Benefit-cost comparison

Turn-to-turn fault diagnosis of an Induction motor by the analysis of Transient and Steady state Stator current

This work proposes an online diagnosis of turn-to-turn stator winding fault of an induction motor through the combine use of Wavelet Transform (WT) and Fast Fourier Transform (FFT). Both steady state and non-stationary transient part of motor stator currents are assessed for detection of this inter turn short circuit fault. First non-stationary part is assessed by formation of contour of the coefficients of Continuous Wavelet Transform (CWT) of stator current – result shows significant change of amplitude at certain frequencies. Secondly, the supply frequency is filtered off from the steady part of motor current. Then on this filtered signal (i) Fast Fourier Transform (FFT) is performed where from spectrums are observed at different percentage of inter turn short condition and (ii) performing Discrete Wavelet Transform (DWT) detailed wave energy has been calculated using Parseval’s theorem. Work has been performed both under load and no-load condition of the motor. The proposed method has been validated in a laboratory prototype. Results indicate that the proposed technique is suitable for real-time application Keywords: CWT, DWT, FFT, fault diagnosis, induction motor, inter-turn short, wave energ

Giant retroperitoneal liposarcoma: report of a rare case

Retroperitoneal liposarcoma is an uncommon malignant mesenchymal tumour of adipocytic differentiation. Giant retroperitoneal liposarcoma is a rare entity which achieves such a large tumour bulk without any significant clinical symptoms due to deep seated location of the tumour. Though incidence of distant metastasis is less but local recurrence is fairly common. Surgical management is the key of management in retroperitoneal liposarcoma in spite of its large size and local invasion to vital organs. We are reporting a case of giant retroperitoneal liposarcoma of 27.5 Kg in a 45 year old female patient

Laminar fluid flow and heat transfer in an annulus with an externally enhanced inner tube

Laminar forced convection in a double-pipe heat exchanger is studied numerically. In this study, an isothermal tube with periodic enhancements (promoters) is placed concentrically inside an isulated circular tube. Pressure drop and heat transfer characteristics of promoters are obtained at various geometric and flow condtions. These are compared to an unenhanced (circular) tube annulus of identical length and heat transfer surface area while the mass flow rate and the Reynolds number are kept the same. A promoter with Gaussian shape established superiority over a cosine shape and other normal distribution shapes, since it provides high heat transfer enhancement with a small increase in the pressure drop. Effects of promoter length and spacing on the pressure drop and heat transfer are small. The pressure drop is influenced significantly by the promoter height and the annular grap, while the promoter height is the only significant geometric parameter affecting the heat transfer. At Reynolds numbers of less than 500, the pressure drop in the enhanced tube annulus is 50 percent more than in the unenhanced tube annulus. Heat transfer enhancement, though small (about 20 percent) at a Peclet number (ReD Pr) less than 200, increases with the Reynolds number and the Prandtl number. At the highest ReD (=1,000) and Pr (=5) investigated, heat transfer from the enhanced tube annulus is about eight times more than that from the unenhanced tube annulus. However, for this case the pressure drop increase by only a factor of two.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30922/1/0000592.pd

An evaluation of phase change microcapsules for use in enhanced heat transfer fluids

The results of an experimental study to evaluate the properties of microencapsulated phase change materials have been presented. Two phase change materials, n-eicosane and stearic acid, have been used in the study. The microcapsules were manufactured with two different wall thickness, comprising of approximately 15% and 30% of the total microcapsule volume. Three different microcapsule sizes ranging from 50[mu] to 250[mu] have been considered. The microcapsules with thinner walls are unable to withstand repeated thermal cycling past the melting point. However, the microcapsules with thicker walls were found to be both structurally as well as thermally stable.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/29260/1/0000317.pd

Sero-prevalence of SARS CoV-2 specific antibody among general population of Tripura, India: A baseline observation

Background: Spectrum of COVID-19 disease ranges from asymptomatic or mild symptomatic to life threatening cases. Population based sero-epidemiological studies are useful for assessing the magnitude of COVID-19 infection in a geographic area and it is helpful for planning control measures. Objectives: To estimate the sero-prevalence of SARS CoV-2 antibody in the general population of Tripura and to study the factors associated with it. Methodology: This community based cross-sectional study was conducted from 15th October to 14th November 2020 among 4800 subjects selected from the whole state of Tripura, India by probability proportionate to size sampling technique using 30 clusters. Electrochemiluminescence (eCLIA) based assay was used to test the serum samples for SARS-CoV-2 specific antibody. Data entry and analysis was performed using SPSS-25 for windows and sero-prevalence was expressed in percentages. Binary logistic regression model was used for predicting sero-positivity by including the significant factors associated with SARS-CoV-2 infection as found out by univariate analysis. Result: Sero-prevalence of SARS-CoV-2 antibody was found to be 34% among the general population of Tripura and it varied from 42.4% to 19.7% across different districts. Logistic regression model has identified, urban residency (OR: 1.21, 95% CI: 1.03-1.42), ethnic community (OR: 0.55, 95% CI: 0.48-0.64) and literacy (OR: 1.41, 95% CI: 1.13-1.77) as the independent risk factors for SARS-CoV-2 sero-positivity (p<0.05). Conclusion: Approximately one out of three residents of Tripura has already acquired the novel SARS CoV-2 infection. As the threshold required for achieving herd immunity against COVID-19 is not yet known, control measures need to be continued for preventing further spread of disease in the community

Low reynolds number flow and heat transfer experiments in 7-rod vertical bundles

Experiments have been conducted in 7-rod vertical bundles within circular shell. Buoyancy supports the forced flow in one and opposes it in the other. The Reynolds number range nominally covered 900 to 30000; but no distinct transition was observed. The behaviour is explained through a porous medium model. Procedures for estimating bundle-average permeability and fRe values on the basis of porosity have been illustrated for the case of forced flow. Although friction was increased in downflow and decreased in upflow due to buoyancy, change in thermal transport rate was not discerned within Gr/Re = +/- 40.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30644/1/0000286.pd

Industry/University Collaboration at the University of Michigan-Dearborn: A Focus on Relevant Technology

https://deepblue.lib.umich.edu/bitstream/2027.42/154104/1/kampfner1996.pd

Industry/University Collaboration at the University of Michigan-Dearborn: A Focus on Relevant Technology

https://deepblue.lib.umich.edu/bitstream/2027.42/154105/1/kampfner1997.pd

Industry/University Collaboration at the University of Michigan-Dearborn: A Focus on Relevant Technology

https://deepblue.lib.umich.edu/bitstream/2027.42/154106/1/kampfner1998.pd