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Chandrasekar, N.
- Calophyllum apetalum Interceded Blend of Silver Nanoparticles and their Antimicrobial Impact
Abstract Views :343 |
PDF Views:195
Authors
C. P. Chandrappa
1,
M. Govindappa
1,
N. Chandrasekar
2,
Sonia Sarkar
1,
Sepuri Ooha
1,
R. Channabasava
1,
G. S. Vijay Kumar
3,
C. P. Ramesh
4
Affiliations
1 Dept of Biotechnology, Shridevi Institute of Engg and Technology, Sira Road, Tumkur- 572106, Karnataka, IN
2 Department of Chemistry, Shridevi Institute of Engineering and Technology, Sira Road, Tumkur-572106, Karnataka, IN
3 Department of Microbiology, Shridevi Institute of Medical Sciences and Research Hospital, Tumkur-572 106, Karnataka, IN
4 Department of Zoology, N.S.R.P. Govt. Degree College for Women, Hindupur, Andhrapradesh, IN
1 Dept of Biotechnology, Shridevi Institute of Engg and Technology, Sira Road, Tumkur- 572106, Karnataka, IN
2 Department of Chemistry, Shridevi Institute of Engineering and Technology, Sira Road, Tumkur-572106, Karnataka, IN
3 Department of Microbiology, Shridevi Institute of Medical Sciences and Research Hospital, Tumkur-572 106, Karnataka, IN
4 Department of Zoology, N.S.R.P. Govt. Degree College for Women, Hindupur, Andhrapradesh, IN
Source
Indian Journal of NanoScience, Vol 4, No 2 (2016), Pagination: 1-7Abstract
Background/Objective: synthesis of silver nanoparticles by the extract of Calophyllum apetalum and their characterization to find out size and morphology of the particles.
Methodology: The characterization was done by X-Ray diffractive (XRD), UV- Visible spectroscopy and scanning electron microscopy (SEM). X-Ray diffraction (XRD) was used to find out the particle size and SEM image was used to determine its morphology.
Findings: 94nm silver nanoparticles were synthesized.
Improvements/Application: As antibacterial agents.
Keywords
Calophyllum apetalum, UV-VIS, SEM, XRD, Silver Nanoparticles, Antibacterial.Full Text
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- Evaluation of Arc Welding Process Using Digital Storage Oscilloscope and High Speed Camera
Abstract Views :424 |
PDF Views:9
Authors
Affiliations
1 Weldcraft Private Limited, Yeshwanthpur, Bangalore - 560 022, IN
2 Materials Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, IN
3 National Institute of Technology, Karnataka, Surathkal - 575 025, IN
1 Weldcraft Private Limited, Yeshwanthpur, Bangalore - 560 022, IN
2 Materials Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, IN
3 National Institute of Technology, Karnataka, Surathkal - 575 025, IN
Source
Indian Welding Journal, Vol 48, No 4 (2015), Pagination: 35-43Abstract
Digital Storage Oscilloscope (DSO) and a high speed camera with laser light illumination are used to monitor manual metal arc (MMA) welding process. Welding was carried out using different type of welding power sources and electrodes. Dynamic variation in current and voltage was recorded using a DSO with very high sampling of four Giga samples/s. Arc welding process was imaged using high speed camera simultaneously. Data obtained from DSO were subjected to time domain and statistical analysis. Probability density distribution (PDD) analysis of the voltage and current signals were carried out.
The results showed that a proper filtering should be applied for the raw data collected using DSO to generate useful information. It was possible to correlate various physical processes that occur during welding with corresponding variations in voltage and current. High speed images from the camera enabled to view the physical processes that occur during arc welding and hence helped to obtain this one to one correlation. Statistical analysis showed that PDD generated from the acquired data is unique to a welding power source or a consumable or a welder. Hence PDDs can be used to evaluate performance of power sources or consumables. Accordingly, separate PDDs for a inverter and a generator power source were produced. By combining both imaging and DSO signals it was also possible to show different modes of metal transfer in arc welding process. Thus the feasibility of monitoring arc welding process using DSO and high speed camera has been demonstrated successfully.
Keywords
Metal Transfer, Arc Welding, High Speed Imaging, Statistical Analysis, Welding Signal Analysis.
- Field Energy Approach for Homogenization of Metamaterials
Abstract Views :126 |
PDF Views:0
Authors
Affiliations
1 School of Electronics Engineering, VIT University, Chennai - 600127, Tamil Nadu, IN
1 School of Electronics Engineering, VIT University, Chennai - 600127, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 8, No 20 (2015), Pagination:Abstract
Objectives: In recent years metamaterials have been widely accepted to explore its new and unique electromagnetic properties. Metamaterials differ from conventional materials in terms of its structure i.e. they have inclusions in place of atoms and molecules. It is because of this uncommon structure and geometry that metamaterials show these electromagnetic properties. Methods: To know about these responses in detail there is a nee d to find parameters like permittivity and permeability for these materials. To simplify this complicated process of calculation of parameters, homogenization techniques are used. Findings: So, this paper deals with the study of homogenization technique called Field Energy Method and retrieval of parameters from it. It also focuses on comparing Field Energy Method with Average Method and proving that earlier is more efficient than the later.Keywords
Average Method, Electromagnetic Waves, Field Energy Method, Homogenization, Metamaterial.Full Text