- A. Mukhopadhyay
- R. K. Verma
- D. Ghosh
- S. K. Roy
- D. Deb
- J. P. Singh
- R. S. Chaurasia
- F. B.
- C. Chatterjee
- D. Chakraborty
- T. K. Das
- Arkendu Ghosh
- K. Dey
- N. Bhowmick
- S. K. Ghosh
- S. Bandyopadhyay
- P. S. Medda
- M. Raihan
- T. K. Roy
- S. Mukherjee
- G. Vinamra
- A. Kumar
- P. K. Rai
- S. Chattopadhyaya
- P. K. Sarkar
- Ashish Soni
- Anunay Priyesh
- Sidhanth Raj
- S. Bhatia
- S. Mukherkee
- Journal of Environment and Sociobiology
- Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)
- Current Science
- Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics
- International Journal of Scientific Engineering and Technology
- Journal of the Association of Engineers, India
- Indian Welding Journal
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Ghosh, A.
- A New Record of Pisania (Jeannea) Gracilis (Sowerby) (Mollusca:Gastropoda) from India
Authors
1 Zoological Survey of India, M-Block, New Alipore, Kolkata-700 053, IN
Source
Journal of Environment and Sociobiology, Vol 10, No 2 (2013), Pagination: 217-218Abstract
The genus Pisania belongs to the family Bucciniidae, order Neogastropoda, class Gastropoda and phylum Mollusca. In India only one species is represented under this genus, namely, Pisanea ignea (Gmelin) from the Bay of Bengal (Dance, 1992; Subba Rao, 2003; Suryo Rao et al., 2004). During our studies on the abundance and diversity of malacofauna of the Gulf of Kutchh, we came across one living specimen of Pisania (Jeannea) gracilis (Sowerby, 1859). The record of this species has significance from taxonomic point of view as it is recorded for the first time from India. Only one specimen of this gastropod species was collected from Dwaraka beach, Gujarat by the junior author on 17.04.2005 [ZSI Reg. No. M 27538 (Fig. 1)].
- Gravity Survey Over Bankura Anorthosite Complex, West Bengal
Authors
1 Indian School of Mines, Dhanbad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 16, No 3 (1975), Pagination: 361-369Abstract
Results of Gravity surveys conducted over Bankura anorthosite complex lying between latitude 23°28.5' to 23°33'N and longitude 86°50' to 87°15'E are discussed. The area is characterised by a gravity high of the order of 20 mgals in the eastern part and decreases to 4-5 mgals in the western part. The gravity high is found to be unrelated to the anorthosite and extends beyond the outcrop of this exposure. It is attributed to the presence of a gabbroic body underlying the anorthosite and its adjacent areas. The thickness of anorthosite layer is found to be less than 200 meters. Assuming a density contrast of +0.23 gm/cc between the underlying gabbro and the surrounding Bengal gneisses, the maximum thickness of the gabbro is found to be 5.0 km in the eastern part near Rajarampur (23°29.7'N, 87°11'E). The causative body is found to be elongated along the strike of the anorthosite exposure. It appears to be faulted underneath the Damodar river along the northern as well as the northeastern sides.- A Study on General Allometric Relationships Developed for Biomass Estimation in Regional Scale Taking the Example of Tectona grandis Grown in Bundelkhand Region of India
Authors
1 Indian Grassland and Fodder Research Institute, Jhansi 284 003, IN
2 Uttar Banga Krishi Viswavidyalaya, Cooch Behar 736 165, IN
Source
Current Science, Vol 110, No 3 (2016), Pagination: 414-419Abstract
In this communication an effort has been made to develop a general non-site specific allometric relationship taking Tectona grandis grown in semi-arid Bundelkhand region without harvesting any tree. To determine the most appropriate predictor variable for producing the relationship, different physiological parameters of this tree species like diameter at breast height (dbh), basal diameter, tree height, forking height, collar diameter, etc. were collected from the standing trees from MP part of Bundelkhand region, comprising a total of 45 sites of 4 districts namely Guna, Vidisha, Chhatarpur and Tikamgarh. The dataset contained 418 trees with biomass ranging from 12.79 kg/tree to 12707.92 kg/tree, height ranging from 1.5 to 18.5 m and dbh ranging from 0.03 to 0.44 m. For developing the models; dbh, height, dbh × height and dbh2 × height were used as predictor variables. All four contrasting sites were taken for developing allometric models and after examining model residuals and site-specific relationships, it was found that using dbh2 × height alone as the predictor variable produced the most stable model. Thus it makes regional estimation of aboveground biomass production easier with precision as accurate as site-specific allometry.Keywords
Allometry, Bundelkhand Region, Normalized Difference Vegetation Index, Residual Diagnostics, Tectona grandis.Full Text
References
- Gould, S. J., Allometry and size in ontogeny and phylogeny. Biol. Rev., 1966, 41, 587–638.
- Peng, C., Growth and yield models for uneven-aged stands: past, present and future. For. Ecol. Manag., 2000, 132, 259–279.
- Favrichon, V., Modeling the dynamics and species composition of tropical mixed- species uneven-aged natural forest: effects of alternative cutting regimes. For. Sci., 1998, 44, 113–124.
- Namaalwa, J., Eid, T. and Sankhayan, P., A multi-species densitydependent matrix growth model for the dry woodlands of Uganda. For. Ecol. Manage., 2005, 213, 312–327.
- Picard, N., Yalibanda, Y., Namkosserena, S. and Baya, F., Estimating the stock recovery rate using matrix models. For. Ecol. Manage., 2008, 255, 3597–3605.
- Gourlet-Fleury, S. and Houllier, F., Modelling diameter increment in a lowland evergreen rain forest in French Guiana. For. Ecol. Manage., 2000, 131, 269–289.
- Crow, T. R., Common regression to estimate tree biomass in tropical stands. For. Sci., 1978, 24, 110–114.
- Ketterings, Q. M., Richard, C., Yakub, A. and Cheryl, A. P., Reducing uncertainty in the use of allometric biomass equations for predicting above-ground tree biomass in mixed secondary forests. For. Ecol. Manage., 2001, 146, 199–209.
- Menon, A. R. R. and Thomas, T. P., National carbon project: Spatial assessment of vegetation and soil carbon pool of Northern Kerala, Final report of the project, 2011, p. 13; ISSN 0970-8103.
- Gertner, G. Z., The sensitivity of measurement error in stand volume estimation. Can. J. For. Res., 1991, 20, 800–804.
- Zanne, A. E. et al., Global wood density database. Dryad, 2009, identifier (http://hdl.handle.net/10255/dryad.235).
- Priyanka, B., Chaubey, O. P. and Singhal, P. K., Biomass accumulation and carbon sequestration in Tectona grandis Linn. f. and Gmelina arborea Roxb. Int. J. Bio-Sci. Bio-Technol., 2013, 5, 153–173.
- Brown, S. and Luge, A. E., Aboveground biomass estimates for tropical moist forests of the Brazilian Amazon. Jaterciercia, 1992, 17, 8–18.
- Simon, E., Buendia, L., Miwa, K., Ngara, T. and Tanabe, K. (eds), IPCC Guidelines for National Greenhouse Gas Inventories, Institute for Global Environmental Strategies (IGES) for the IPCC, 2006, vol. 1, pp. 4–12; ISBN: 4-88788-032-4.
- Parresol, B. R., Assessing tree and stand biomass: a review with examples and critical comparisons. For. Sci., 1999, 45, 573–593.
- Montgomery, D. C., Peck, E. A. and Vining, G. G., Introduction to Linear Regression Analysis, John Wiley & Sons, 2003, 3rd edn.
- Shapiro, S. S. and Wilk, M. B., An analysis of variance test for normality (complete samples). Biometrika, 1965, 52, 591–611.
- Ecosystems and Human Well-Being
Authors
1 Department of Zoology, Bankura Christian College, Bankura-722101, West Bengal, IN
Source
Journal of Environment and Sociobiology, Vol 8, No 1 (2011), Pagination: 25-42Abstract
Over the past 50 years, humans have altered their environment to a significant extent, although human well-being is dependent on ecosystem functioning. Ecosystems are particularly affected by unsustainable use of resources, such as, food, water, and timber. Ecosystem functions depend on water, carbon, and other nutrients cycles. Human activities have modified these cycles in a number of way. Use of ecosystems for recreation, spiritual enrichment, cultural purposes, and for other short term benefits is growing continuously, although ecosystem capacity to provide such services has reported to be declined significantly. Human well-being depends on material welfare, health, good social relations, security and freedom, which are affected by changes in ecosystem services. Intensive ecosystem use often produces short-term advantage.
Poverty level remains high in more than one billion people, who are dependent on ecosystems with an income of less than $1 per day as reported elsewhere. Regions including some parts of Africa, Asia and Latin America have the greatest ecosystemrelated problems and are facing developmental challenges. Habitat change occurs, for instance, when the area of land used for agriculture or cities is expanded. Instability and unproductivity including desertification, water logging, mineralization and many other unwanted outcomes throughout the world are continuing. Habitat fragmentation by roads, canals, power lines limits the species potential for dispersal and colonization. Indirect drivers, like changes in human population, economic activity and technology as well as socio-political and cultural factors affect ecosystems by influencing direct drivers. World climate has changed and continues to change, affecting temperature, rainfall and sea levels.
Intensive fertilizer use has polluted ecosystems. Climate change and high nutrient levels in water are becoming increasing problems. Ecosystem management for shortterm benefits is increasing. Loss of biodiversity makes it difficult for ecosystems to recover from damage. Once an ecosystem has undergone an abrupt change, recovery to the original state is slow, costly, and sometimes impossible. Changes in ecosystems complexity- functioning relationships could diminish the stability, resistance and resilience of managed terrestrial ecosystems, and may jeopardize important food and fibre sources, and ability of natural ecosystems both to provide natural resources, and to remove pollutants from atmosphere.
Ecological complexity and ecosystem functioning depend on factors that govern species coexistence. Complexity of landscapes is determined by number of ecosystem types, their characteristics, their sizes and shapes, and associated connectivity. Complexity at this scale would have large consequences on regional to global scale processes. Presence and arrangement of keystone ecosystem types, such as, wetlands often determine total carbon and nitrogen balance of a region. Changes in average or extreme environmental events and intense land use management are believed to increase species extinction rate in isolated habitat fragments. Loss of key species, such as, top predators, fruit dispersers and pollinators from habitat may severely disrupt ecosystems functioning. Land use changes due to expanding urbanization, concomitant landscape fragmentation and intensification of production systems. Such change results in transformation of an ecosystem, form one state to another state, via a transition phase.
The combined value of 17 ecosystem services has been reported in the estimated range of US$16-54 trillion per year by Costanza and others. About 30% of modern medicines are developed from plants and animals, and 10 of the world's 25 topselling drugs in 1997 were reported to be derived from natural sources. Global market value of pharmaceuticals derived from genetic resources is estimated at US $ 75 000-150 000 million annually. Some 75% of the world's populations rely for health care on traditional medicines, which are derived directly from natural sources as recorded elsewhere. Socio-economic development of human civilization and human well-being depends on long-term health of environment including ecosystems. Environmental problems are generally addressed in isolation, but practically such problems are interrelated, and originate from the ischolar_main cause of unsustainable development. Damage to natural ecosystems and release of environmental pollutants must be minimized for protecting natural ecosystem, and human well-being.
Keywords
Ecosystem Services, Human Well-Being, Drivers of Changes, Ecosystem Functioning, Global Warming, Human Population Growth, Land Conversion.- Transmission Effect and Impact Effect of Urban Economic Growth
Authors
Source
Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 36, No 1 (1994), Pagination: 28-41Abstract
This paper seeks to establish the thesis that all round development over a sufficiently large area is not possible. Since, an increase in production has a two- fold effect while markets of some sectors located in specific regions are stimulated, invariably there is a depressing effect on some other regions or sectors. There is thus, rarely a balanced growth either over all regions or over all sectors. To counter balance this tendency, as far as possible through mobility of labour and transfer of capital from one sector to another becomes necessary. A historical illustration with time series data for Iran of the middle east growing very fast as a whole at that time is given.- On Endogenising Population in Input-Output Framework
Authors
Source
Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 28, No 2 (1986), Pagination: 171-180Abstract
In this paper an attempt has been made to extend the input-output model in a new direction by bringing the population into the model on the lines of other sectors but in a meaningful way by extending slightly the concept of the augmented matrix which incorporates the consumption vector (col) and employment vector (row) within the model with its own system of co-efficients.- The Application of Generalised Inverse in Static and Dynamic Input-Output Analysis
Authors
Source
Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 25, No 2 (1983), Pagination: 147-172Abstract
Conventional input-output analysis either in its static form or in its dynamic form normally requires a non-singular coefficient matrix for the solution of its system of equations. This sets a handicap to the handling of interesting systems of equation except by severely reducing its size to the minimum achievable non-singular form, or, to approach the system in ways which do not require the inversion of the coefficient matrix.- Input-Output Models for Planning in a Mixed Economy - A New Approach
Authors
Source
Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 23, No 3-4 (1981), Pagination: 345-351Abstract
The original input-output model as formulated by Professor Leontief was one of a general equilibrium type, popularly known as the closed version, described in condensed form below:
Let xl, X2, X3 be the outputs of three sectors in the economy Xl, x2 being intermediate sectors and X3 the household sector. Let Xij (i, j = 1,2,3) be the flows or deliveries from sector i to j in such a system. Then two sets of balance relations could be set up.
- An Inter-Industrial Programming Model for Production and Transportation of Commodities for Different Regions of India
Authors
Source
Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 9, No 2 (1967), Pagination: 210-227Abstract
This paper is in the nature of an exploratory study into the optimal pattern of regional production and exchange of commodities in India. The process of economic development for India as a whole has raised urgent problems of the kind of dispersion that should he made of industries in order that the different regions may have satisfactory rates of growth without loss of efficiency, while the operation of the industries as a whole may also be efficient both as regards production and transportation. This is important especially in India in view of the fact that a large part of total industrial investment in India is in the public sector and is, therefore, guided according to notions of national welfare, in so far as is consistent with certain norms of efficiency.- Lemon Cv. Assam Lemon (Citrus limon Burm.) Quality and Soil-Leaf Nutrient Availability Affected by Different Pruning Intensities and Nutrient Management
Authors
1 Department of Fruits and Orchard Management, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia 741 252, IN
2 Department of Pomology and Post Harvest Technology, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar 736 165, IN
3 Department of Agronomy, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar 736 165, IN
4 Department of Plantation Crops and Processing, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar 736 165, IN
5 Department of Agricultural Statistics, Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar 736 165, IN
Source
Current Science, Vol 112, No 10 (2017), Pagination: 2051-2065Abstract
A field experiment was laid out in two factorial randomized block design with four levels of pruning and seven levels of nutrients, consisting recommended dose of fertilizers and different combinations of organic manure (vermicompost), inorganic fertilizer, bio-fertilizer (azotobacter), mycorrhiza (VAM) and their interaction between 2013 and 2015 on 9-year-old lemon plants. Studies revealed that all physicochemical parameters, viz. fruit weight, puncture force, total soluble solid, total sugar, ascorbic acid were highest in (P3N4) combination of higher level of pruning. However, the maximum availability of leaf and soil nutrients was recorded in N4.Keywords
Lemon, Nutrient Management, Pruning, Soil-Leaf Nutrient Availability, Yield and Quality.Full Text
References
- Iglesias, D. J. et al., Physiology of citrus fruiting. Brazilian J. Plant Physiol., 2007, 19, 333–362.
- Anon., In National Horticulture Board Data Base, National Horticulture Board, 2015.
- Singh, I. P. and Singh, S., In Citrus Monograph, ICAR Publication, National Research Centre for Citrus, Nagpur, 2006, p. 30.
- Singh, R. and Saxena, S. K., In Fruits, National Book Trust, India, New Delhi, 2008, p. 91.
- Khehra, S. and Bal, J. S., Influence of organic and inorganic nutrient sources on growth of lemon (Citrus limon Burm.) Cv. Baramasi. J. Exp. Biol. Agril. Sci., 2014, 2, 126–129.
- Zekri, M. and Orbeza, T. A., Plant nutrients for citrus trees. In Extension Service Fact Sheets SL 200, Florida cooperative extension service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, 2003.
- Singh, S., Gill, P. S., Dhillon, W. S. and Singh, S., Effect of heading back on photosynthesis, yield and fruit quality in pear. Not Sci. Biol., 2012, 4, 90–94.
- Mazumdar, B. C. and Majumder, K., Determination of chemical constituents. In Methods of Physico-Chemical Analysis of Fruits, Daya Publishing House, Delhi, 2003, pp. 93–139.
- Rangana, S., Ascorbic acid. In Manual Analysis of Fruit and Vegetable Products, Tata McGraw-Hill Publishing Co. Ltd, New Delhi, 1977, pp. 94–101.
- Abd EL-Migeed., M. M., Saleh, M. S. and Mostafa, E. A. M., The beneficial effect of minimizing mineral nitrogen fertilization on Washington Navel orange trees by using organic and biofertilizers. World J. Agric. Sci., 2007, 3, 80–85.
- Fiske, C. H. and Row, Y. S., In Experimental Biochemical Research Techniques (eds Cowgill, R. W. and Pardec, A. B.), 1925, p. 177.
- Jackson, M. L., In Soil Chemical Analysis, Asia Publishing House, New Delhi, 1962, pp. 115–120.
- Ghosh, S. P., Citrus. In Fruits: Tropical and Subtropical (eds Bose, T. K. and Mitra, S. K.), Naya Prakash Publishers, Calcutta, 1996, pp. 63–131.
- Singha, A., Adak, T., Kumar, K., Shukla, S. K. and Singh, V. K., Effect of integrated nutrient management on dehydrogenase activity, soil organic carbon and soil moisture variability in a mango orchard ecosystem. J. Anim. Plant Sci., 2014, 24, 843–849.
- Subbiah, B. V. and Asija, G. L., A rapid procedure of determination of available nitrogen in soil. Curr. Sci., 1956, 25, 259–260.
- Saha, A. K., In Method of Physical and Chemical Analysis of Soil, Kalyani Publishers, West Bengal, 2008, pp. 1–169.
- Bray, R. H. and Kurtz, L. P., Determination of total organic and available form of phosphorus in soil. Soil Sci., 1945, 59, 39–45.
- Black, C. A., In Methods of Soil Analysis, Part II, Agron. Ser. No. 9, American Society of Agronomy Inc., Madison, Wisconsin, USA, 1965.
- Singh, S. S., Srivestera, V. S. and Singh, P., Training/pruning. In Advances in Citriculture (ed. Singh, S.), Kalyani Publisher, Karnataka, India, 2004, pp. 206–219.
- Ahmad, S., Chatha, Z. A., Nasir, M. A., Aziz, A., Virk, N. A. and Khan, A. R., Effect of pruning on the yield and quality of kinnow fruit. J. Agric. Soc. Sci., 2006, 2, 51–53.
- Lal, G. and Dayal, H., Effect of integrated nutrient management on yield and quality of acid lime (Citrus aurentifolia swingle). Afr. J. Agric. Sci., 2014, 9, 2985–2991.
- Kumar, H., Katiyar, P. N., Singh, A. K. and Rajkumar, B. V., Effect of different pruning severity on growth and yield of ber (Zizyphus mauritiana Lamk), cv. Banarsi Karaka. Int. J. Curr. Microbiol. Applied Sci., 2014, 3, 935–940.
- Prakash, S., Kumar, V., Saroj, P. L. and Sirohi, S. C., Response of yield and quality of winter guava to severity of summer pruning. Indian J. Hortic., 2012, 69, 173–176.
- Sandhu, S. and Bal, J. S., Response of lemon cv. Baramasi to foliar feeding of nutrients. Indian J. Hortic., 2012, 69, 281–283.
- Sites, J. W. and Reitz, H. J., The variation in individual Valencia oranges from differences locations of the tree as a guide to sampling methods and sport picking for quality soluble solids in the juice. Proc. Amer. Soc. Hortic. Sci., 1948, 54, 1–10.
- Kumar, V., Singh, M. K., Singh, M., Dev, P. and Mohan, B., Influence of integrated nutrient management (INM) on yield and quality of lemon (Citrus limon Burn.) cv. Pant Lemon-I under western UP conditions. Ann. Hortic., 2012, 5, 137–139.
- Goldwebber, S., Boss, M. and Lynch, S. J., Some effects of nitrogen, phosphorus and potassium fertilization on the growth, yield and quality of persian limes. In Proc. Fla. State Hort. Soc., 1956, 69, 328–332.
- Yadav, A. K., Singh, J. K. and Singh, H. K., Studies on integrated nutrient management in flowering, fruiting, yield and quality of mango cv. Amrapali under high density orcharding. Indian J. Hortic., 2011, 68, 453–460.
- Dutta, P., Kundu, S., Bauri, F. K., Talang, H. and Majumder, D., Effect of bio-fertilizers on physicochemical qualities and leaf mineral composition of guava grown in alluvial zone of West Bengal. J. Crop Weed., 2014, 10, 268–271.
- Shukla, S. K., Adak, T., Singha, A., Kumar, K., Singh, V. K. and Singh, A., Response of guava trees (Psidium guajava) to soil application of mineral and organic fertilizer and biofertilizers under conditions of low fertile soil. J. Hortic. Res., 2014, 22, 105–114.
- Bohane, L. and Tiwari, R., Effect of integrated nutrient management on physico-chemical parameter of ber under malwa plateau conditions. Ann. Plant and Soil Res., 2014, 16, 346–348.
- Kumar, D. and Pandey, V., Effect of NPK fertigation on growth, yield and quality of banana ‘Rasthali’ in coastal agro-climatic conditions of eastern India. Indian J. Agric. Sci., 2011, 78, 798–800.
- Gharge, D. D., Karadge, B. A. and Gandhi, M. B., Cumulative effect of VAM fungus and Rhizobium on carbohydrate and mineral content of Carica papaya L. Indian J. Adv. Plant Res., 2014, 1, 50–55.
- Bhattarai, B. P. and Tomar, C. S., Effect of integrated nutrient management on leaf nutrient status of walnut (Juglans regia L.). Nepal J. Sci. Technol., 2009, 10, 63–67.
- Shaheen, M. A., AbdElWahab, S. M., El-Morsy, F. M. and Ahmed, A. S. S., Effect of organic and biofertilizers as a partial substitute for NPK mineral fertilizer on vegetative growth, leaf mineral content, yield and fruit quality of superior grapevine. J. Hort. Sci. Ornamental Plants, 2013, 5, 151–159.
- Bala, S., Chaudhary, V. R. and Shukla, H. S., Effect of organic manure and biofertilizers with graded dose of NPK on soil and leaf nutrient status of aonla (Emblica officinalis Gaertn.) cv. Banarasi. Karnataka J. Agric. Sci., 2011, 24, 709–711.
- Effect of Fibre Blend Ratios on Yarn Properties
Authors
1 Textile Engineering Department, Daffodil International University, Dhaka, BD
Source
International Journal of Scientific Engineering and Technology, Vol 4, No 4 (2015), Pagination: 243-246Abstract
Yarn properties can be altered through blending fibres. According to the requirement different properties can be achieved by different blending ratios. Among the different blends cotton and polyester, cotton and wool, wool and acrylic, cotton and nylon, jute and acrylic, cotton and rayon etc are common. Flax and polyester has been a popular blend now-a-days and depicts excellent properties than their individual yarn properties. Different proportion of flax and polyester has been tested to observe the yarn properties and it is found that polyester was perfectly fits with low proportion of flax. Their blends with specific ratios exhibit excellent properties which hence ultimately contribute to the fabric properties.Keywords
Polyester, Flax, Blend, Imperfection, Hairiness.Full Text
- A Few Words on Infrared Rays and Stress Analysis by Invisible Light
Authors
1 Department of Mechanical Engineering, Bengal Engineering College, Howrah, IN
2 Department of Applied Mechanics, Bengal Engineering College, Howrah, IN
Source
Journal of the Association of Engineers, India, Vol 52, No 3 (1977), Pagination: 149-162Abstract
It was Sir William Harschel (discoverer of Urenus), Royal Astronomer of King George III of England who first discovered the infrared rays in 1800 Harschel's most important contributions provided the following findings for the later works:I) he showed that there was satisfactory detector available for investigating the new region of the spectrum by using a sensible mercury in glass thermometer at the different part of spectrum band of suns rays, 2) he raised questions regarding the basic similarity of light and heat. In 1830 Nobili made the first thermocouple based on Seebeck's effect.- Identification and Assessment of the HAZ Softening and Hardening Phenomena for Submerged Arc Welding Process for Structural Steel Plates
Authors
1 Department of Mechanical Engg. Govt Engineering College, Kalyani, W.B,, IN
2 MECON India Ltd., Ranchi, IN
3 Department of Mechanical Engg. & Mining Machinery Engg., Indian School of Mines, University, Dhanbad, IN
Source
Indian Welding Journal, Vol 42, No 2 (2009), Pagination: 37-42Abstract
Submerged Arc Welding (SAW) process has lot of social and economical implication. Critical set of variables are involved in this process, and they are needed to be controlled. An attempt has been made in this paper to find out- the influence of the heat input on HAZ hardness (change of hardness & microstructure) for Submerged Arc Welding Process of Mild steel plates. Mild steel plates are welded by changing input variables (current, voltage, trolley speed, i.e. heat input) and Rockwell hardness No. on different grid points (points are taken horizontally & vertically 2 mm apart) of welded surface and at the zone adjacent to the welded portion has been observed. A detailed analysis of the microstructure changes is carried out to understand the HAZ softening phenomenon.
Keywords
SAW, HAZ Hardness, Rockwell Hardness No., Microstructure, Grain Growth.- Indepth Investigations into the Capability of Plazma Arc Cutting of Mild Steel Tubes
Authors
1 Department of Mechanical Engineering & Mining Machinery Engineering, Indian School of Mines University, Dhanbad, IN
2 Mecon Ltd., Ranchi, IN
Source
Indian Welding Journal, Vol 42, No 3 (2009), Pagination: 58-64Abstract
Plasma Arc cutting (PAC) is a process of cutting steel and other metals (or sometimes other materials) using a plasma torch. In this method, an inert gas (in some units, compressed air) is blown at high speed out of a nozzle. At the same time an electrical arc is formed through that gas from the nozzle to the surface being cut, turning some of that gas to plasma. The plasma is sufficiently hot to melt the metal being cut and moves sufficiently fast to blow molten metal away from the cut. Plasma can also be used for plasma arc welding and other applications. In Plasma Arc Cutting (PAC), the plasma gas flow is enhanced so that the intense and deeply penetrating plasma jet cuts through the material and molten material is removed as cutting dross. PAC differs from oxy-fuel cutting in that the plasma process operates by using the arc to melt the metal whereas in the oxy-fuel process, the oxygen oxidizes the metal and the heat from the exothermic reaction melts the metal. Unlike oxy-fuel cutting, the PAC process can be applied to cutting metals which form refractory oxides such as stainless steel, cast iron, aluminum, and other non-ferrous alloys. In this paper the deviations in the thickness of the cut profile of the square tubes are critically analyzed for assessment of the deviations in the cut surface of the square tubes of structural steel due to the phenomena like top edge rounding, dross, cut surface bevel angle, top spatter and extended kerf width etc.
Keywords
Top Edge Rounding, Kerf Width, Dross, Top Spatter, Cut Surface Bevel Angle.- Analysis of The Influence of The Heat Input and Bead Volume on HAZ Hardness for Submerged Arc Welding Process of Mild Steel Plates
Authors
1 Department of Mechanical Engineering and Mining Machinery Engineering, ISMU, Dhanbad, IN
2 Departments of Mechanical Engineering, Kalyani Govt. Engineering College, Kalyani, W.B.,, IN
3 MECON Limited, Ranchi, Jharkhand, IN
Source
Indian Welding Journal, Vol 41, No 3 (2008), Pagination: 46-51Abstract
In Submerged Arc Welding process involves critical set of variables which are needed to control. An attempt has been made in this paper to find out- the influence of the heat input and bead volume on HAZ Hardness for Submerged Arc Welding Process of Mild steel plates. Mild steel plates are welded by changing input variables (current, voltage, trolley speed, i.e. heat input) and Rockwell hardness no. has been observed on welded portion and at the zone adjacent to the welded portion. A detailed analysis of the microstructure changes is carried out to understand the HAZ softening phenomenon.
Keywords
SAW, Microstructure, HAZ, Hardness.- Weldbead Parametric Estimation of SAW Process Through Neural Network
Authors
1 Dept., Kalyani Govt Engg. College, Kaiyani, IN
2 Mecon Limited, Ranchi, IN
3 Department of Mechanical Engg. & Mining Machinery Engg. Indian School of Mines University, Dhanbad, IN
Source
Indian Welding Journal, Vol 40, No 4 (2007), Pagination: 33-43Abstract
In this paper, an attempt has been taken to develop a model to predict the yield characteristics (weld bead parameters) of Submerged Arc Welding (SAW) process with the help of neural network technique. The SAW process has been chosen for this application because of the complex set of variables and high set up cost involved in the process as well as its significant application in the manufacturing of critical equipments which have a lot of economic and social implications.
Under this study the neural network model has been trained according to the actual inputs and outputs.
After completing training, the desired inputs have been given to the model and it gives the estimated output value. And according to this we can also estimate the error between the actual and predicted results. Neural network is implemented here because of having remarkable ability to derive meaning from complicated or imprecise data and can be used to extract patterns and detect trends that are too complex to be noticed by either humans or other computer techniques. Hence a trained neural network can be thought of as an "expert" in the category of information it has been given to analyses.