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2018 - 20192
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Author: Annu × End date: 2019 × Start date: 2018 × Type: Thesis ×
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    ThesisItemOpen Access
    Genetic and Environmental Architecture of Twins Cognition
    (CCSHAU, 2019) Annu; Dhanda, Bimla
    Genetic and environmental influences on cognition of twins from two districts of state Haryana were assessed. A sample of 100 pairs of twins in the age groups of 6-8 years was chosen from selected locations. Cognition of twins was assessed with help of Wechsler Intelligence Scale for Children WISC-R (Wechsler, 1974) whereas home environment was assessed by using the Home Observation for Measurement of the Environment (HOME) Inventory (Bradley et al. 1988). Regarding personal profile of the respondents, the results revealed that most of the twins were boys having one sibling and second ordinal position. Majority of the twins were living in nuclear family with medium size family structure. With regard to parental education, highest percentage of twins were having their fathers educated 11th and above level but were farmers, where as mothers were educated upto matriculation that was the reason they were homemakers. Result on the twins indicated that all the aspects of cognitive abilities, namely, similarities, digit span, arithmetic, object assembly, comprehension and picture arrangement were found to make significant difference in cognition of twins on the basis of standard test. The heritability estimates shown a great role of genes in framing the overall cognitive abilities of twins. The significant associations of cognitive abilities were found with the variables namely; caste, mother education and occupation in Hisar district. Home environment was also influential factor for development of cognitive abilities in twins of both districts.
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    ThesisItemOpen Access
    Techno-economic evaluation of solar biomass shredder
    (CCSHAU, 2018) Annu; Yadvika
    The present study was carried out to evaluate the techo-economic performance of shredder. Four crops residues viz. wheat straw, paddy straw, pearl millet stalk, and cotton stalks were selected for shredding purpose. Shredding of crop residues was done at speeds (1500, 2500 and 3500) and at five moisture content (6, 8, 10, 12, and 14 %) expect for wheat which was also shredded at 16% and18% moisture content. Both the moisture content and rotational speed significantly affected the performance of shredder. The output results showed that the initial length, diameter and bulk density was recorded as ( 45.7 cm, 3.32 mm), (98.7cm, 3.28mm), (182.7cm,14.3mm) and (145cm,17.1mm) and bulk density was (23.20-28.70 kg/m3), (13.76-14.16 kg/m3), (27.00-31.27 kg/m3) and (14.37-18.20 kg/m3). and for of wheat straw, paddy straw, pearl millet stalk and cotton stalk, respectively. Both the moisture content and rotational speed significantly affected the performance of shredder. Capacity, shredding efficiency and power consumption for shredder were evaluated for all the crop residues. It was found that maximum capacity of 60.39kg/h, 55.61kg/h, 46.77 kg/h and 41.68 kg/h were obtained at 6% moisture content and 3500 rpm for all the crop residues. The optimum shredding efficiency of 97.6%, 96.8%, 98.5% and 99.1% were obtained for wheat straw, paddy straw, pearl millet stalk and cotton stalk, respectively. The maximum power consumption and of shredder was observed to be 2.03 kWh, 2.02 kWh, 2.14 kWh and 1.93 kWh at 16% moisture content and 3500 rpm for wheat straw and 12% moisture content and 3500 rpm for paddy straw, pearl millet stalk and for cotton stalk, respectively. The maximum bulk density was observed as 47.27 kg/m3, 52.23 kg/m3, 58.54 kg/m3 and 69.49 kg/m3 at 18% moisture content and 2500 rpm for wheat straw and at12% moisture content and 3500 rpm for paddy straw, pearl millet stalk and for cotton stalk, respectively. Particle size distribution was also studied for shredded crop residues through sieve analysis. The maximum average length with its weight percentage were recorded as 76.73 mm and 60.73% at 18% moisture content and 1500 rpm, 71.78mm and 60.11%, 60.20 mm and 51.96%, 62.01 mm and 70.12% at 14% moisture content and 1500 rpm for wheat straw, paddy straw, pearl millet stalk, cotton stalk, respectively. The study of environmental parameters during the entire study showed that the solar radiation varied between 770 to 1289 W/m2 while, temperature varied from 33.1°C to 38.4 °C and humidity varied from 24.6 % to 40.3 % during the entire study period. The payback period and benefit cost ratio of machine were calculated as 4.0 years and 5.0.