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Jayaprakash, J.
- Evaluating Biometric Traits for Selecting Elite Trees in Acacia nilotica (Var. Indica) Based on Progeny Trials in Tropical India
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Authors
Source
Indian Forester, Vol 136, No 5 (2010), Pagination: 652-660Abstract
To improve the growth and yield of Acacia nilotica Linn. (Babul) a study was conducted using genetically superior elite trees. The study revealed that the selected traits viz. plant height, basal diameter, number of branches and volume were highly significant which indicate higher variability among half-sibs. Further, regression analysis revealed that the half-sibs of TNPKM1 and KRKL2 are best and may be utilized for future breeding programmes. Overall study implies that the traits like plant height, basal diameter and number of branches have maximum influence on volume, hence the traits will be useful in selecting Acacia nilotica trees for agroforestry development programmes.Keywords
Genetic Advance, Phenotypic Variation, Genotypic Variation
- Evaluation of Aonla (Emblica officinalis Gaertn.) Cultivars for Agroforestry System in North-western Himalayas
Abstract Views :362 |
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Fruit, Medicinal Value
Authors
Source
Indian Forester, Vol 137, No 4 (2011), Pagination: 447-452Abstract
An experiment was conducted to screen suitable 'aonla' cultivars for agri-horti system and quantify low cost moisture conservation practice as weed mulch for aonla grown on wasteland of Doon Valley at Indo-Italian Fruit Development Project at Dhakrani, Dehradun. The four cultivars of aonla with three levels of weed mulch in urd-toria crop rotation were tested on degraded lands of Doon Valley. NA-7 cultivar of aonla was recorded maximum fruit yield (59.8 kgtree-1 ), grain yield of Urd (6.1 qha-1 ), Toria (4.5 qha-1 ) and canopy volume (78.5 m3 ) on such land followed by Chakaiya which attained -1canopy volume (90.2 m3 ), fruit yield (58.1 kg tree-1 ) with minimum grain yield of 'urd' (5.76 qha-1 ) and 'toria' (4.54 qha-1 ). NA-7 observed maximum fruit size (43.76 g) followed by NA-10 whereas Chakaiya produced maximum vitamin-C (561.73 mg 100 g fruit-1 ) and TSS (21.62 %). Weed mulch applied @ 20 kg tree had conserved more moisture and influenced growth and yield attributes in all the cultivars as compared to control plot significantly. Economically, NA-7 is better for intercropping with urd-toria crop rotation as compared to Chakaiya, NA-10 and NA-6. Hence, it is concluded that NA-7 cultivar of aonla is most suited for agrihorti system on degraded lands due to less canopy volume and good returns from the system.Keywords
Emblica Officinalis, Agri-horti System, North-western Himalayas, Important IndigenousFruit, Medicinal Value
- A Longitudinal Study to Analyse & Quantify Functional Capacity Post- Coronary Artery Bypass Grafting
Abstract Views :275 |
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Authors
Affiliations
1 Jamia Hamdard, New Delhi, IN
2 Centre for Physiotherapy & Rehabilitation Sciences, Jamia Millia Islamia, New Delhi, IN
3 Department of Physiotherapy, Artemis Health Institute, Gurgaon, IN
1 Jamia Hamdard, New Delhi, IN
2 Centre for Physiotherapy & Rehabilitation Sciences, Jamia Millia Islamia, New Delhi, IN
3 Department of Physiotherapy, Artemis Health Institute, Gurgaon, IN
Source
Indian Journal of Physiotherapy & Occupational Therapy-An International Journal, Vol 6, No 3 (2012), Pagination: 139-143Abstract
Study Objective: to analyze and quantify the Functional capacity in post-coronary bypass subjects by using six minute walk test on 6th and 13th post operative day by comparing their value with matched normal subject.
Sample: a convenient sample of 15 patients, 12 male and 03 female age group of 40-60 years who underwent coronary artery bypass grafting (CABG) included in this study. In group B, 15 age, sex, height and weight matched normal subjects were also taken to compare the data of patients to analyze the CABG patients functional capacity.
Design: a longitudinal quasi- experimental design.
Methods: the 6minute walk test (6MWD) was conducted according to standardized protocol on each of test days. Participants were told "the purpose of this test is to see how far you can walk in six minutes". Oxygen saturation, heart rate, blood pressure, respiratory rate and rate of perceived exertion was taken at the start and end of six minute walk test and distance covered in six minutes noted, similarly, 6 minute walk test was conducted on the matched normal subjects and the following distance noted.
Results: results showed significant increase in six minute walk distance over the period of time. The mean value of 6MWD on 6th post-operative day was 280 + 46 meter which increased to statistically significant level of 355 + 43 meters on 13th post operative day (p=0.00). When looking at change in 6MWD covered by CABG subjects and normal subjects on 13th post-op day, indicating the decrease in lag or improvement in 6MWD between CABG subjects and matched normal group. However, none of the patient reached to values of normal matched group by 13th post-op day.
Conclusion : This study help us suggest that the patient with this age group following CABG achieve functional capacity in the range of 3-5 MET's and could easily perform activities in this range by 13th post op day. Further, understanding functional level will assist in determining patient's need for rehabilitation services after CABG surgery.
Keywords
Six Minute Walk Distance, Coronary Artery Bypass Grafting, Cardiac RehabilitationReferences
- Okraine Karen, Banerjee Devi K, Eisenberg Mark J. Coronary Heart disease: the developing world. American Heart Journal 2004; 148: 7-15.
- Singh Ram N, Sosa Julia A, Albany NY, Green.George E. Long term fate of the internal mammary artery & saphenous vein grafts. J Thoracic Cardiovascular surgery 1983; 86: 359-363.
- 3Michael X. Pham, Jonathan N. Myers and Victor F. Froelicher. Cardiac Rehabilitation Cardiovascular Medicine 2007, Section IV, 1113-1132.
- 4Gerald F. Fletcher; Gary J. Balady; Ezra A.; Bernard Chaitman,; Robert Eckel, MD; Jerome Fleg; Victor F. Froelicher; Arthur S. Leon; Ileana L. Piña; Roxanne Rodney; Denise A. Simons-Morton; Mark A. Williams; Terry Bazzarre. Exercise Standards for Testing and Training: A Statement for Healthcare Professionals From the American Heart Association. Circulation. 2001; 104: 1694-1740.
- Brooks D, Solway S, Gibbons WJ.ATS statement on six-minute walk test. Am J Respir Crit Care Med. 2003 May 1; 167(9): 1287.
- Jaeger AA, Hlatky MA, Paul SM, Gortner SR. Functional capacity after cardiac surgery in elderly patients. J Am Coll Cardiol 1994 Jul; 24(1).
- Hirschhorn AD, Richards D, Mungovan SF, Morris NR, Adams L. Supervised Moderate Intensity Exercise Improves Distance Walked at Hospital Discharge Following Coronary Artery Bypass Graft Surgery-A. Randomised Controlled Trial. Heart Lung Circ. 2007: Nov 28.
- DiMattio MJ, Tulman L. A longitudinal study of functional status and correlates following coronary artery bypass graft surgery in women. Nurs Res. 2003; Mar-Apr; 52(2): 98-107, Nurs Res. 2003 Jul-Aug; 52(4).
- Livelihood Security through Litchi (Litchi chinensis L.)-Based Agri-Horticultural Models for Resource-Poor Communities of Indian Sub-Himalaya
Abstract Views :257 |
PDF Views:88
Authors
Avinash Chandra Rathore
1,
H. Lal
1,
N. K. Sharma
1,
Harsh Mehta
1,
J. Jayaprakash
1,
O. P. Chaturvedi
1
Affiliations
1 Central Soil and Water Conservation Research and Training Institute, Kaulagarh Road, Dehradun 248 003, IN
1 Central Soil and Water Conservation Research and Training Institute, Kaulagarh Road, Dehradun 248 003, IN
Source
Current Science, Vol 106, No 11 (2014), Pagination: 1481-1484Abstract
No Abstract.Full Text
- Experimental Investigation of DSS/HRS GTAW Weldments
Abstract Views :136 |
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Authors
Affiliations
1 Department of Mechanical Engineering, St Peters University, Avadi, Chennai - 600054, IN
2 Department of Mechanical Engineering, Dr. MGR Educational and Research Institute University, Chennai - 600095, IN
3 Department of Automobile Engineering, Sathyabama University, Chennai - 600119, IN
1 Department of Mechanical Engineering, St Peters University, Avadi, Chennai - 600054, IN
2 Department of Mechanical Engineering, Dr. MGR Educational and Research Institute University, Chennai - 600095, IN
3 Department of Automobile Engineering, Sathyabama University, Chennai - 600119, IN
Source
Indian Journal of Science and Technology, Vol 9, No 43 (2016), Pagination:Abstract
Objectives: The Gas Tungsten Arc Welding (GTAW) of blanks 2 mm thick of Duplex Stainless Steel (DSS) and Hot Rolled Medium and High Tensile Structural Steel (HRS) is carried out to investigate the metallurgical, mechanical properties and the fracture. Methods: The characterization of the weldments involves tests, viz. macrostructure, microstructure, micro composition analysis through Energy Dispersive Analysis of X ray (EDAX) to find out the metallurgical properties and micro hardness test, tensile test, bend test to determine the mechanical properties of the weldments. Topography of tensile test fractured specimens was analyzed with the help of Scanning Electron Microscope (SEM) and determines the influence of the welding on the ductility of the weld material. Findings: The increase in the weld zone micro hardness and formation of dendritic delta ferrite microstructure, when compared with the DSS parent metal having elongated grained austenite with ferrite and the HRS parent metal having fine grains of ferrite, caused the joint efficiency of the DSS/HRS weldment to increase. The Energy Dispersive Analysis of X ray (EDAX) indicates the formation of dendritic delta ferrite microstructure is attributed to the presence of elements like Si and Cr. The SEM fractography analysis indicates that the weldments possess good tensile strength without decrease in ductility of the fusion zone. Applications: Experimental investigation of mechanical properties and microstructure of DSS-HRS dissimilar GTAW weld joints and fracture analysis with EDAX to identify the changes in the chemical compositions of the fractured specimen.Keywords
Duplex Stainless Steel, GTAW, Hot Rolled Steel, Mechanical Properties, Microstructure.Full Text
- Mechanical Properties and Phase Transformations in Resistance Spot Welded Dissimilar Joints of AISI409M/AISI301 Steel
Abstract Views :179 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical Engineering, St Peters University, Avadi, Chennai - 600054, Tamil Nadu, IN
2 Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
3 Department of Mechanical Engineering, Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
4 Department of Automobile Engineering, Sathyabama University, Chennai - 600119, Tamil Nadu, IN
1 Department of Mechanical Engineering, St Peters University, Avadi, Chennai - 600054, Tamil Nadu, IN
2 Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
3 Department of Mechanical Engineering, Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
4 Department of Automobile Engineering, Sathyabama University, Chennai - 600119, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 42 (2016), Pagination:Abstract
Objectives: This study aims to investigate the mechanical properties and phase transformations in dissimilar metal joints between AISI 301 Austenitic Stainless Steel and AISI 409M Ferritic Stainless Steel, joined by resistance spot welding. Methods/Analysis: Mechanical properties such as tensile shear strength, failure energy, failure mode, nugget size and surface indentation were analysed at varying current ratings. Macrostructure was examined for size and shape. Microstructure at various locations such as, fusion zone and heat affected zones were investigated. Micro hardness measurement was done at various locations along the weld. Findings: Peak load incremented progressively with rise in welding current, till the commencement of severe expulsion. Weld zone hardness showed a higher value than that of nearby heat affected zones and parent metals. Increment in welding current resulted in enlargement of weld nugget and rise in energy absorption capacity. Electrode indentation values were seen to be correlated with welding current values positively. Fusion zone microstructure consists of marten site and ferrite. Asymmetrical nugget shape was observed. Novelty/Improvement: This study explores the properties, both mechanical and microstructure of AISI 409M-AISI 301 steel dissimilar joint, joined by resistance spot welding.Keywords
AISI301, AISI409M, Failure mode, Microstructure, Peak load.Full Text
- Mechanical Properties and Phase Transformations in Resistance Spot Welded Dissimilar Joints of AISI409M/AISI301 Steel
Abstract Views :135 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical Engineering, St Peters University, Avadi, Chennai- 600054, Tamil Nadu, IN
2 Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
3 Department of Mechanical Engineering, Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
4 Department of Automobile Engineering, Sathyabama University, Chennai - 600119, Tamil Nadu, IN
1 Department of Mechanical Engineering, St Peters University, Avadi, Chennai- 600054, Tamil Nadu, IN
2 Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
3 Department of Mechanical Engineering, Dr MGR Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
4 Department of Automobile Engineering, Sathyabama University, Chennai - 600119, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 41 (2016), Pagination:Abstract
Objectives: In this study, the mechanical properties and phase transformations of resistance spot welded dissimilar joints between austenitic stainless steel AISI 301 and ferity stainless steel AISI 409M are investigated. Methods/Analysis: Mechanical properties such as tensile shear strength, failure energy, failure mode, nugget size and surface indentation were analysed at varying current ratings. Macrostructure was examined for size and shape. Microstructure at various locations such as, fusion zone and heat affected zones were investigated. Micro hardness measurement was done at various locations along the weld. Findings: Tensile shear strength increases with increase in welding current in expulsion free welds. Fusion zone hardness was found to be larger than that of both base metals and heat affected zones. Nugget size and energy absorbing capacity of the spot weld were found to be in correlation with weld current in expulsion free samples. Electrode indentation on the nugget surface increases with increase in welding current. Fusion zone microstructure consists of martensite and ferrite. Asymmetrical nugget shape was observed. Novelty/Improvement: Investigating the effects of resistance spot welding on the mechanical properties and phase transformations of ferritic-austenitic dissimilar metal weld joint.Keywords
AISI301, AISI409M, Dissimilar Metal Welding, Resistance Spot Welding, Tensile Shear Strength.Full Text