Informatics Publishing Limited

G. Shyamala ¹, K. P. Shivanand ², S. Suresh Babu ³

Affiliations
1 Civil Engineering Department, VLB Janakiammal College of Engineering and Technology, Coimbatore-641 042, T.N., IN
2 Civil Engineering Department, Siddaganga Institute of Technology, Tumkur, T.N., IN
3 Civil Engineering Department, Erode Sengunthar Engineering College, Erode-638 057, T.N., IN

Abstract

The pollutant samples ere collected from the drains of 11 stations each at the banks of River Cauvery and Kalingarayan canal to analyse physico-chemical characteristics. The data clearly revealed the pollution pattern and magnitude of pollutant load in the study area. The quality of pollutants and possible suggestions to minimize the pollution hazards have been discussed.

Keywords

Water Pollution, Domestic Sewage, Industrial Effluents, River Cauvery.

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G. Shyamala ¹, K. P. Shivanand ², S. Suresh Babu ¹

Affiliations
1 Department of Civil Engineering, V.L.B. Janakiammal College of Engineering and Technology, Kovaipudur, Coimbatore-641 642, T.N., IN
2 Department of Civil Engineering, Siddaganga Institute of Technology, Tumkur, T.N., IN

Abstract

Ground water is being polluted due to sustained habitat practices including industrial activities and urbanization. The catastrophic sources of pollution decline the quality standards of both surface and ground waters. These destructive sources have been mapped with IRSP6MX image (NRSA courtesy) along with its attributes, thereof to serve as a comprehensive quality manual under GIS environment for the study area, a part of the Cauvery river basin.

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Sobhan Kumar Kompalli ¹, S. Suresh Babu ¹, Lakshmi N. Bharatan ², K. Krishna Moorthy ³

Affiliations
1 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
2 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuinram 695 022, IN
3 ISRO Head Quarters, Bengaluru 560 231, IN

Abstract

Long-term measurements (from August 2009 to December 2014) of aerosol black carbon mass concentration (M_BC) and spectral aerosol optical depth (AOD) were carried out from a high-altitude location, Hanle in western trans-Himalaya as part of the Regional Aerosol Warming Experiment. Both MBC and AOD showed distinct annual pattern with a clear spring-time enhancement (April-June) with significant inter-annual variability associated with the changes in source processes. The potential source regions contributing to the spring-time enhancement in aerosol loading are the dust-dominated west Asian region as well as biomass burning from NW India. The overall annual mean value of M_BC over Hanle is extremely low compared to many other Himalayan locations, including the Ganges Valley Aerosol Experiment campaign site at Nainital, which also showed spring-time (pre-monsoon) enhancement. The vertical extents of elevated aerosol layers, which contribute to the spring-time enhancement, are found to be in the range 5-7 km amsl from the analysis of vertical profiles of extinction coefficients from CALIPSO data.

Keywords

Aerosol Optical Depth, Black Carbon, Spring-Time Enhancement, High-Altitude Locations.

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Ajeet Sharma ¹, S. Senthil Selvan ¹, S. Suresh Babu ², D. Elango ²

Affiliations
1 Civil Engineering Department, SRM University, Chennai - 603203, Tamil Nadu, IN
2 Civil Engineering Department, Valliammai Engineering College, Chennai - 603203, Tamil Nadu, IN

Abstract

Cold-formed steels are made by rolling or pressing steel into semi-finished or finished goods at room temperatures. Cold-formed steel products are made by the working of steel billet, bar or sheet using stamping, rolling and including roll forming or presses to deform it into a usable product. Objective: By flexural-torsional behaviour channel section connected back to back. Four specimen of built up I section formed by using symmetric channel section connected back to back with the help of bolts provided in the web part of section. All the specimens were tested for flexural-torsional strength under two point loading. For this analytical study of cold-formed channel section four specimen of dimension of a 230 mm × 100 mm × 3 mm with a lip of 30 mm and 4 specimens of dimension of 180 mm x 50 mm x 1.6 mm with a lip of 20 mm and 1.8 m length were loaded vertically were unrestrained to allow flexural buckling. Method: The analytical investigation of the built up I section will be carried out using FEM modelling ANSYS. The theoretical values are calculated using IS 801:1975 and BS-5:5950. Findings: For the selected channel section with 230 mm and 180 mm depth the difference in theoretical, analytical and experimental results are found to be 2.5% and 4%. Application: Further this study can be carried out for steel section with increased or decreased depth of web and lip. It can also be used as a roofing sheet in warehouses etc.

Keywords

Back to Back Connection, Cold−Formed Steel, Flexural and Torsional Behaviour, Lipped Channel Section, Torsoinal Behaviour.

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R. Srinivasan ¹, Sidramappa V. Itti ², S. Suresh Babu ¹

Affiliations
1 Department of Civil Engineering, Adhiyamaan College of Engineering, Hosur, Tamilnadu-635109, IN
2 K.L.E. College of Engineering & Technology, Chikodi-591201, Belagavi, Karnataka, IN

Abstract

Infill panels are widely used as interior partitions and external walls in buildings, but they are usually treated as non-structural elements and in a lot of cases their stiffness is not included in the reinforced concrete design. While performing the evaluation of existing reinforced concrete buildings, to know the actual behavior of structure, effect of infill need to be incorporated in seismic evaluation. The masonry infill has been modeled as an equivalent diagonal structural element using Main-stone theory. Pushover analysis has been carried out on bare frame and frame with infill. The result shows that infill, if present in all storeys, gives a significant contribution to the energy dissipation capacity. Seismic performance assessments indicate that, the infill frame has the lowest collapse risk and the bare frame is found to be the most vulnerable to earthquake-induced collapse. The diagonal strut has been modeled using E-tabs software and pushover analysis is performed. The example building is analyzed; the effect of masonry infill in seismic evaluation of bare frame and frame with masonry infill is studied. The results obtained from the analysis are compared in terms of strength and stiffness with bare frame.

Keywords

Seismic Performance, Dynamic Loads, Masonry Infill, Pushover Analysis, Main-Stone Theory.

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K. Krishna Moorthy , S. Suresh Babu , B. V. Krishna Murthy , J. Srinivasan

Abstract

No Abstract.

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Mukunda M. Gogoi ¹, S. Suresh Babu ¹, B. S. Arun ¹, K. Krishna Moorthy ², A. Ajay ³, P. Ajay ⁴, Arun Suryavanshi ⁵, Arup Borgohain ⁶, Anirban Guha ⁷, Atiba Shaikh ⁸, Binita Pathak ⁴, Biswadip Gharai ⁹, Boopathy Ramasamy ¹⁰, G. Balakrishnaiah ¹¹, Harilal B. Menon ⁸, Jagdish Chandra Kuniyal ¹², Jayabala Krishnan ¹³, K. Rama Gopal ¹¹, M. Maheswari ¹³, Manish Naja ¹⁴, Parminder Kaur ⁷, Pradip K. Bhuyan ⁴, Pratima Gupta ¹⁵, Prayagraj Singh ¹⁶, Priyanka Srivastava ¹⁴, R. S. Singh ¹⁷, Ranjit Kumar ¹⁵, Shantanu Rastogi ¹⁶, Shyam Sundar Kundu ⁶, Sobhan Kumar Kompalli ¹, Subhasmita Panda ¹⁰, Tandule Chakradhar Rao ¹¹, Trupti Das ¹⁰, Yogesh Kant ¹⁸

Affiliations
1 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
4 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
5 Regional Remote Sensing Centre, Indian Space Research Organisation, Nagpur 440 033, IN
6 North Eastern – Space Application Centres, Shillong 793 103, IN
7 Department of Physics, Tripura University, Suryamaninagar, Agartala 799 022, IN
8 Department of Marine Sciences, Goa University, Goa 403 206, IN
9 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
10 Indian Institute of Mineral and Materials Technology, Bhubaneswar 751 013, IN
11 Sri Krishna Devaraya University, Anantapur 515 003, IN
12 G. B. Pant Institute of Himalayan Environment and Development, Kullu 175 126, IN
13 Tamil Nadu Agricultural University, Coimbatore 641 003, IN
14 Aryabhatta Research Institute of Observational Sciences, Nainital 263 002, IN
15 Department of Chemistry, Dayalbagh Educational Institute, Agra 282 005, IN
16 Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273 009, IN
17 Department of Chemical Engineering, IIT-BHU, Varanasi 221 005, IN
18 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN

Abstract

In this study, we assess the response of ambient aero-sol black carbon (BC) mass concentrations and spec-tral absorption properties across Indian mainland during the nation-wide lockdown (LD) in connection with the Coronavirus Disease 19 (COVID-19) pan-demic. The LD had brought near to total cut-off of emissions from industrial, traffic (road, railways, ma-rine and air) and energy sectors, though the domestic emissions remained fairly unaltered. This provided a unique opportunity to delineate the impact of fossil fuel combustion sources on atmospheric BC characte-ristics. In this context, the primary data of BC meas-ured at the national network of aerosol observatories (ARFINET) under ISRO-GBP are examined to assess the response to the seizure of emissions over distinct geographic parts of the country. Results indicate that average BC concentrations over the Indian mainland are curbed down significantly (10–40%) from pre-lockdown observations during the first and most in-tense phase of lockdown. This decline is significant with respect to the long-term (2015–2019) averaged (climatological mean) values. The drop in BC is most pronounced over the Indo-Gangetic Plain (>60%) and north-eastern India (>30%) during the second phase of lockdown, while significant reduction is seen during LD1 (16–60%) over central and peninsular Indian as well as Himalayan and sub-Himalayan regions. De-spite such a large reduction, the absolute magnitude of BC remained higher over the IGP and north-eastern sites compared to other parts of India. Notably, the spectral absorption index of aerosols changed very little over most of the locations, indicating the still persisting contribution of fossil-fuel emissions over most of the locations.

Keywords

ARFINET, Black Carbon, COVID-19.

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