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- A Study on the Effectiveness of Active Fin Roll-Stabilizers through Numerical Simulation
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International Journal of Innovative Research and Development, Vol 1, No 10Sp (2012), Pagination: 145-159Abstract
The effectiveness of a given fin on the roll motion of a given naval platform over a range of speed, heading, loading conditions are studied. The roll motions of the hull are determined based on both coupled sway-roll-yaw equations and uncoupled roll equations, and it is found that roll predictions can be significantly different from these two sets of equations suggesting a strong coupling between particularly sway and roll. The effect of the active fins given by a generic control equation where the fin angle depends on roll angle, roll velocity as well as roll acceleration is added within the equation of motion to determine the roll with the controls working. Results of the numerically simulated roll over different frequency and speed ranges for different control parameters for the chosen hull show that at higher speeds the roll can be reduced by as much as a factor of 6, while at lower speeds, this factor is somewhat low, of the order of 3.Full Text
- A Report on Soil and Plant Parasitic Nematodes (Orders:Dorylaimida and Tylenchida) of Maharashtra, India
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1 Zoological Survey of India, M-Block, New Alipore, Kolkata-700053, IN
1 Zoological Survey of India, M-Block, New Alipore, Kolkata-700053, IN
Source
Journal of Environment and Sociobiology, Vol 14, No 2 (2017), Pagination: 241-254Abstract
Soil and plant parasitic nematodes are hidden enemies of agriculture due to their minute structure and are responsible for serious yield losses. During taxonomic survey on soil free living and plant parasitic nematodes from April, 2012 to March, 2015 in Maharashtra 19 species belonging to the order Dorylaimida and 9 species under Tylenchida were collected. These are identified following the keys made by Jairajpuri and Ahmad (1992) and Siddiqi (2000) for the orders Dorylaimid and Tylenchida respectively. Two dorylaimid species are newly recorded from India. Six dorylaimid and 2 tylenchid species are recorded for the first time from Maharashtra. The specimens are deposited to the National Zoological Collections of Zoological Survey of India, Kolkata with registration number. A consolidated report of 32 species under 21 genera and 11 families of Dorylaimida and 49 species under 22 genera and 11 families of Tylenchida described and recorded so far from Maharashtra till date is presented herein.Keywords
Nematode, Dorylaimida, Tylenchida, Taxonomy, Maharashtra.
References
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- New Species of Nygolaimoidea, Nygellus shamimi Sp. Nov. (Nematoda:Dorylaimida) with a first Record of Aetholaimus indicus from West Bengal, India
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1 Zoological Survey of India, M-Block, New Alipore, Kolkata-700053, West Bengal, IN
1 Zoological Survey of India, M-Block, New Alipore, Kolkata-700053, West Bengal, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 115, No 3 (2015), Pagination: 223-229Abstract
Thorne (1939) established the genus Nygellus with a single species clavatus having a combination of features of both Nygolaimidae and Belondiridae. Inspite of the nygolaimoid pharynx and mural tooth, he placed the genus under Belondiridae due to the presence of sheath of spiral muscles surrounding the basal expanded part of pharynx. Later Williams (1958) and Jairajpuri (1964) included two didelphic species Nygellus symmetricus and N. caudatus respectively in the genus because of the presence of spiral muscles around the basal part of pharynx. Clark (1961) transferred the genus Nygellus Thorne, 1939 to Nygolaimidae considering the nygolaimoid characters to be more fundamental and important than belondiroid characters.Full Text
- Some Species of Dorylaimoidea (Nematoda) Associated with Guava and Litchi, with New Records from West Bengal, India
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Authors
Affiliations
1 Zoological Survey of India, M – Block, New Alipore, Kolkata – 700 053, West Bengal, IN
1 Zoological Survey of India, M – Block, New Alipore, Kolkata – 700 053, West Bengal, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 115, No 1 (2015), Pagination: 7-19Abstract
Few specimens of Aporcelaimellus amylovorus (Thorne and Swanger, 1936) Heyns, 1965, Aporcelaimellus baqrii Ahmad & Jairajpuri, 1982, Aporcelaimellus chauhani Baqri & Khera, 1975, Aporcelaimellus coomansi Baqri and Khera, 1975, Aporcelaimellus indicus Baqri & Jairajpuri, 1968, Aporcelaimellus papillatus (Bastian, 1865) Baqri and Khera, 1975, Aporcelaimellus tritici (Bastian, 1865) Andrássy, 1986 and Tyleptus projectus Thorne, 1939 were collected from soil around the ischolar_mains of guava and litchi plantations at different locations of South 24-Parganas, West Bengal, India. Among these A. papillatus and A. tritici are the new records from India.Full Text
- Free Living and Plant Parasitic Soil Nematodes (Orders Dorylaimida and Tylenchida) of Himachal Pradesh, India
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PDF Views:137
Authors
Affiliations
1 Zoological Survey of India, M-Block, New Alipore, Kolkata - 700053, IN
1 Zoological Survey of India, M-Block, New Alipore, Kolkata - 700053, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 114, No 3 (2014), Pagination: 379-390Abstract
Himachal Pradesh is a state in Northern part of India with Shimla as the state capital. It is spread over 21,495 sq miles (55,670 km2), and is bordered by the states of Jammu and Kashmir on the north, Punjab on the west and south-west, Haryana and Uttar Pradesh on the south, Uttarakhand on the south-east. Himachal Pradesh is located between 30°10´ to 33°12´ north latitude and 75°47´ to 79°04' east longitude.Full Text
- A New and a Known Species of Telotylenchinae (Tylenchida: Belonolaimidae) from West Bengal, India
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PDF Views:124
Authors
Affiliations
1 Zoological Survey of India, M - Block, New Alipore, Kolkata - 700 053, West Bengal, IN
2 Parasitology Laboratory, Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
1 Zoological Survey of India, M - Block, New Alipore, Kolkata - 700 053, West Bengal, IN
2 Parasitology Laboratory, Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 112, No 2 (2012), Pagination: 27-34Abstract
A few specimens of Trophurus clavicaudatus sp. n. and Tylenchorhynchus mashhoodi Siddiqi and Basir, 1959 were collected from soil around the ischolar_mains of litchi (Litchi chinensis Sonn.) at South 24- Parganas district. West Bengal, India. Among 14 valid species of Trophurus Loof, 1956, as listed by Siddiqi (2000), only 4 species have been described and reported from India and other 10 species have been reported from Europe, Africa, North and South America.Full Text
- Two New and Two Known Species of Dorylaimoidea (Nematoda) from West Bengal, India with a Key to the Species of the Genus Indodorylaimus Ali and Prabha, 1974
Abstract Views :227 |
PDF Views:119
Authors
Affiliations
1 Zoological Survey of India, M - Block, New Alipore, Kolkata - 700 053, West Bengal, IN
2 Parasitology Laboratory, Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
1 Zoological Survey of India, M - Block, New Alipore, Kolkata - 700 053, West Bengal, IN
2 Parasitology Laboratory, Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700 019, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 112, No 1 (2012), Pagination: 11-20Abstract
A small female population of Indodorylaimus asaccatus sp. n. was collected from the soil around the ischolar_mains of guava (Psidium guajava L.) and that of I. baqrii sp. n. was collected from the soil around the ischolar_mains of both guava and litchi (Litchi chinensis Sonn.) at South 24-Parganas district. West Bengal, India . The representative s of the genus Indodorylaimus Ali and Prabha, 1974 are predominant in India.Full Text
- Free Living Nematodes (Order Dorylaimida and Triplonchida) of West Bengal, India
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PDF Views:113
Authors
Affiliations
1 Zoological Survey of India, M - Block, New Alipore, Kolkata - 53, IN
1 Zoological Survey of India, M - Block, New Alipore, Kolkata - 53, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 112, No 1 (2012), Pagination: 21-31Abstract
Dorylaimid nematodes, associated with different crop plants from West Bengal, India, were comprehensively reported and described by Sukul (1967a; 1972; 1973), Sukul et al, (1975), Baqri and Khera (1975,1979), Mukherjee and Dasgupta (1981), Baqri. and Jana (1980; 1982 & 1986), Jana and Baqri (1981a & b; 1982; 1984; 1985), Dey and Baqri (1986). Nematodes of jute (Chaturvedi and Khera, 1979) and Paddy (Baqri et al, 1983; Baqri and Ahmad, 2000) have been extensively observed and recorded.Full Text
- Population Fluctuation of Soil Inhabiting Nematodes in Relation to soil Temperature and Moisture at Guava Orchard in West Bengal, India
Abstract Views :240 |
PDF Views:107
Authors
Affiliations
1 Zoological Survey of India, M-Block, New Alipore, Kolkata - 700 053, West Bengal, IN
1 Zoological Survey of India, M-Block, New Alipore, Kolkata - 700 053, West Bengal, IN
Source
Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 117, No 4 (2017), Pagination: 376-382Abstract
Soil edaphic factors like temperature and moisture are important for the community composition of nematodes. Those were considered to assess their effects upon the population of soil nematodes. The present work was carried out in a guava (Psidium guajava L.) orchard at Shalipur (West), Baruipur block of South 24-Parganas for three consecutive years. The results revealed that the maximum populations of nematodes were observed during monsoon with a population of 4169/250gm of soil in the month of July. During monsoon low soil temperature (30.10C - 31.80C) and high soil moisture (20% - 26%) in the month of July were also observed. The minimum population (204/250gm of soil) of soil nematodes was observed during pre- and post-monsoon with a wide range of low to high soil temperature (180C - 340C) and low soil moisture (10% - 13%). This reveals a direct effect of these two climatic factors of soil on the population of soil nematodes which has been established by correlation and regression analysis.Keywords
Correlation, Moisture, Population Fluctuation, Soil Nematode, Temperature.Full Text
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