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Search Results: 1 - 10 of 356316 matches for " G. N. Adhikary "
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Spectral evolution in a Shastry-Sutherland lattice, HoB(4)
D. Biswas,N. Sahadev,G. Adhikary,G. Balakrishnan,K. Maiti
Physics , 2013, DOI: 10.1103/PhysRevB.88.134405
Abstract: We studied the electronic structure of a Shastry-Sutherland lattice system, HoB4 employing high resolution photoemission spectroscopy and ab initio band structure calculations. The surface and bulk borons exhibit subtle differences, and loss of boron compared to the stoichiometric bulk. However, the surface and bulk conduction bands near Fermi level are found to be similar. Evolution of the electronic structure with temperature is found to be similar to that observed in a typical charge-disordered system. A sharp dip is observed at the Fermi level in the low temperature spectra revealing signature of antiferromagnetic gap. Asymmetric spectral weight transfer with temperature manifests particle-hole asymmetry that may be related to the exotic properties of these systems.
Histological Observation of Thyroid Gland at Prepubertal, Pubertal and Castrated Black Bengal Goat
G. N. Adhikary,M. A. Quasem,S. K. Das
Pakistan Journal of Biological Sciences , 2003,
Abstract: The present study was conducted in the Department of Anatomy and Histology with an aim to observe the histological architecture of thyroid gland at prepubertal, pubertal and castrated Black Bengal goat with Hematoxylin and Eosin stain. The thyroid gland was covered by a three-layered capsule, an outer, the middle and an inner layer. The connective tissue capsule was rich in blood vessels, some times accompanied with lymphocytic infiltration also some fibroblasts. From the capsule, connective tissue septa penetrated the gland parenchyma forming indistinct lobe and lobules of the gland. The thyroid gland was consisted of numerous follicles with interfollicular stroma. The follicle consisted of follicular epithelium and intrafollicular substances. Usually, small sizes follicle were near the capsule and active, whereas, large sizes follicle were towards the center of the gland. The thyroid follicles were lined by cuboidal epithelium in prepubertal Black Bengal goats, cuboidal to columnar in pubertal group. Follicular epithelium becomes squamous or flattened in castrated group. The thyroid follicle contained amber-colored homogenous, solid, lightly eosinophilic colloid material. In the active follicle the colloid was thinner and less in amount, whereas, in inactive follicle it was thicker and more quantity. The colloid materials mostly cracked at castrated group but cracked colloidal materials were found in few large follicles or absent in prepubertal and pubertal group of Black Bengal goats. Parafollicular cells or interfollicular cells were arranged singly or grouped within the basal lamina or interfollicular space. The parafollicular cells were significantly decreased in the adult castrated Black Bengal goats than prepubertal and pubertal group. The inetrfollicular spaces were significantly decreased in castrated Black Bengal goats when compared to prepubertal and pubertal group. Thus it can be assumed that histoarchitectures of the thyroid gland of Black Bengal goat changed at different stages with their activity.
Impacts of transported background ozone on California air quality during the ARCTAS-CARB period – a multi-scale modeling study
M. Huang,G. R. Carmichael,B. Adhikary,S. N. Spak
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010, DOI: 10.5194/acp-10-6947-2010
Abstract: Multi-scale tracer and full-chemistry simulations with the STEM atmospheric chemistry model are used to analyze the effects of transported background ozone (O3) from the eastern Pacific on California air quality during the ARCTAS-CARB experiment conducted in June, 2008. Previous work has focused on the importance of long-range transport of O3 to North America air quality in springtime. However during this summer experiment the long-range transport of O3 is also shown to be important. Simulated and observed O3 transport patterns from the coast to inland northern California are shown to vary based on meteorological conditions and the O3 profiles over the oceans, which are strongly episodically affected by Asian inflows. Analysis of the correlations of O3 at various altitudes above the coastal site at Trinidad Head and at a downwind surface site in northern California, show that under long-range transport events, high O3 air-masses (O3>60 ppb) at altitudes between about 2 and 4 km can be transported inland and can significantly influence surface O3 20–30 h later. These results show the importance of characterizing the vertical structure of the lateral boundary conditions (LBC) needed in air quality simulations. The importance of the LBC on O3 prediction during this period is further studied through a series of sensitivity studies using different forms of LBC. It is shown that the use of the LBC downscaled from RAQMS global model that assimilated MLS and OMI data improves the model performance. We also show that the predictions can be further improved through the use of LBC based on NASA DC-8 airborne observations during the ARCTAS-CARB experiment. These results indicate the need to develop observational strategies to provide information on the three-dimensional nature of pollutant distributions, in order to improve our capability to predict pollution levels and to better quantify the influence of these Asian inflows on the US west coast air quality.
Artificial Insemination (AI) by Raw Semen: its Advantages and Disadvantages in Deshi Chicken (Gallus domesticus)
S.K. Das,G.N. Adhikary,M.N. Islam,B.K. Paul
International Journal of Poultry Science , 2004,
Abstract: To judge the advantages and disadvantages of Artificial Insemination (AI) by raw semen in deshi chicken a test experiment was conducted in Bangladesh Agricultural University (BAU) poultry farm, Mymensingh, Bangladesh. Male birds (RIR) were collected from the BAU poultry farm, whereas the female birds (deshi hens) were purchased from nearby local village market. Both types of birds were kept in individual cage with adlibitum food and water and were given abdominal massage at least for three days (at the same time of the day) prior to AI. Collected semen was inseminated (0.20-0.25 ml/hen) directly by soft dropper into the female genital tract. The result of the present experiment showed that 1-2 females could be covered by semen collected from single ejaculate from one cock. It was also found that very small amount of semen was wastage by container. Thus it can be concluded that AI by raw semen is not profitable (except experimental point of view) until we use semen diluents for commercial purpose.
Electronic structure of CaFe2As2
G. Adhikary,D. Biswas,N. Sahadev,R. Bindu,N. Kumar,S. K. Dhar,A. Thamizhavel,K. Maiti
Physics , 2013, DOI: 10.1063/1.4869397
Abstract: We investigate the electronic structure of CaFe$_2$As$_2$ using high resolution photoemission spectroscopy. Experimental results exhibit three energy bands crossing the Fermi level making hole pockets around the $\Gamma$-point. Temperature variation reveal a gradual shift of an energy band away from the Fermi level with the decrease in temperature in addition to the spin density wave (SDW) transition induced Fermi surface reconstruction of the second energy band across SDW transition temperature. The hole pocket in the former case eventually disappears at lower temperatures while the hole Fermi surface of the third energy band possessing finite $p$ orbital character survives till the lowest temperature studied. These results reveal signature of a complex charge redistribution among various energy bands as a function of temperature that might be associated to the exotic properties of this system.
Poultry Diseases at Rajshahi in Bangladesh
M. K. Hossain,M. Ahmed,H. Kabir,M. R. R Sarker,M. A. Jalil,G. N. Adhikary
Journal of Animal and Veterinary Advances , 2012,
Abstract: A pathological study was conducted on the poultry diseases occurring at Rajshahi region of Bangladesh during the period January,2001 to February,2002. A total of 327 cases were studied of which some are sick birds and others are dead. Diagnosis of different disease conditions were made on the basis of history, clinical findings, pathological findings, age(IBD) (12.53%),Infectious laryngo-tracheitis (ILT) (0.61%), Avian leucosis complex (3.36) , Mareks disease (0.61%), Duck plague(2.14%),Pullorum disease(5.81%), of birds, isolation of the organisms ,serology and response to treatment. The diseases thus diagnosed are Newcastle disease (ND) (14.37%), Infectious bursal disease Colibacillosis(5.19%), Fowl cholera(1.83%) , Fowl typhoid (3.66%), Necrotic enteritis (0.91%), Pneumonia (non specific )( 7.03%), Enteritis (non specific) (3.97%), Infectious coryza (1.22%), Aspergillogis (2.44), Chronic respiratory disease(CRD) (8.56%), Coccidiosis (10.70%), Helminthiasis , Deficiency disorders (3.66%) and Miscellaneuos diseases (4028%). Young birds were mostly affected by Colibacillosis, Pullorum disease,ND , IBD etc. Adult birsds were mostly affected by Mycoplasmosis, Fowl typhoid, ND etc. Vaccination failure was common in case of IB. CRD was commonly found as mixed infection with ND.
Vermicompost, the story of organic gold: A review  [PDF]
Sujit Adhikary
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.37110
Abstract: Earthworm has caught imagination of philosophers like Pascal and Thoreau. Yet its role in the nutrition of agricultural fields has attracted attention of researchers worldwide only in recent decades. Waste management is considered as an integral part of a sustainable society, thereby necessitating diversion of biodegradable fractions of the societal waste from landfill into alternative management processes such as vermicomposting. Earthworms excreta (vermicast) is a nutritive organic fertilizer rich in humus, NPK, micronutrients, beneficial soil microbes; nitrogen-fixing, phosphate solubilizing bacteria, actinomycets and growth hormones auxins, gibberlins & cytokinins. Both vermicompost & its body liquid (vermiwash) are proven as both growth promoters & protectors for crop plants. We discuss about the worms composting technology, its importance, use and some salient results obtained in the globe so far in this review update of vermicompost research.
Distribution of Lymphocytes in the Mucosa Associated Lymphoid Tissues (MALT) of Naturally Occurring Infectious Bursal Disease (IBD) in Chicken
M. M. Uddin*, M. Z. I. Khan1, K. N. Islam, A. S. M. G. Kibria, G. N. Adhikary2, M. N. H. Parvez3, J. Basu, M. B. Uddin4 and M. M. Rahman5
Pakistan Veterinary Journal , 2010,
Abstract: This study was aimed to investigate changes in the number and distribution of lymphocytes in the mucosa associated lymphoid tissues (MALT) of digestive tract (proventriculus, duodenum, jejunum, ileum, cecum and cecal tonsils) and respiratory system (lungs) of chicken infected by Infectious Bursal Disease Virus (IBDV). Samples were divided into two groups; IBDV infected group (21, 24 and 30 days old) and control group (non infected birds; 21 days old). Haematoxylin and eosin stained slides were prepared for microscopic studies to observe the distribution and the number of lymphocytes in the mucosa of the digestive tract and respiratory system. Lymphocytes were significantly (P<0.05) lower in proventriculus, duodenum, jejunum, ileum, cecum, cecal tonsils and lungs of IBDV infected chickens than the control. Moreover, the reduction in lymphocytes number was maximum in duodenum and cecal tonsils, while minimal in lungs. Depletion of lymphocyte was mainly in the lamina propria and the core of the villi and depletion increased with the advance of age of IBDV infected chicken. These results demonstrate that IBDV destroys the lymphocytes of the MALT and suppresses the immunity.
Electrostatic solitary waves in dusty pair-ion plasmas
A. P. Misra,N. C. Adhikary
Physics , 2013, DOI: 10.1063/1.4825353
Abstract: The propagation of electrostatic waves in an unmagnetized collisionless pair-ion plasma with immobile positively charged dusts is studied for both large- and small-amplitude perturbations. Using a two-fluid model for pair-ions, it is shown that there appear two linear ion modes, namely the "fast" and "slow" waves in dusty pair-ion plasmas. The properties of these wave modes are studied with different mass $(m)$ and temperature $(T)$ ratios of negative to positive ions, as well as the effects of immobile charged dusts $(\delta)$. For large-amplitude waves, the pseudopotential approach is performed, whereas the standard reductive perturbation technique (RPT) is used to study the small-amplitude Korteweg-de Vries (KdV) solitons. The profiles of the pseudopotential, the large amplitude solitons as well as the dynamical evolution of KdV solitons are numerically studied with the system parameters as above. It is found that the pair-ion plasmas with positively charged dusts support the propagation of solitary waves (SWs) with only the negative potential. The results may be useful for the excitation of SWs in laboratory dusty pair-ion plasmas, electron-free industrial plasmas as well as for observation in space plasmas where electron density is negligibly small compared to that of negative ions.
Large amplitude solitary waves in ion-beam plasmas with charged dust impurities
A. P. Misra,N. C. Adhikary
Physics , 2011, DOI: 10.1063/1.3671951
Abstract: The nonlinear propagation of large amplitude dust ion-acoustic (DIA) solitary waves (SWs) in an ion-beam plasma with stationary charged dusts is investigated. For typical plasma parameters relevant for experiments [J. Plasma Phys. \textbf{60}, 69 (1998)], when the beam speed is larger than the DIA speed ($v_{b0}\gtrsim1.7c_s$), three stable waves, namely the "fast" and "slow" ion-beam modes and the plasma DIA wave are shown to exist. These modes can propagate as SWs in the beam plasmas. However, in the other regime ($c_s0)$ is found to be limited by a critical value which typically depends on $M$, $v_{b0}$ as well as the ion/beam temperature. The conditions for the existence of DIA solitons are obtained and their properties are analyzed numerically in terms of the system parameters. While the system supports both the compressive and rarefactive large amplitude SWs, the small amplitude solitons exist only of the compressive type. The theoretical results may be useful for observation of soliton excitations in laboratory ion-beam driven plasmas as well as in space plasmas where the charged dusts play as impurities.
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