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Search Results: 1 - 10 of 19 matches for " Narit Sitasuwan "
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Post-hatching Growth and Development of the Asian Paradise Flycatcher (Terpsiphone paradisi)
Pattamavadee Ngoenjun,Narit Sitasuwan
Research Journal of Biological Sciences , 2012,
Abstract: Parental care in birds may be provided by one sex or both depending on the maturity of the chicks at hatching and is provided especially to altricial nestlings. These often need both mother and father to provide food for them during their stay in nest. The amount of care the parents provide to the young affects their growth and development between hatching and fledgling and increases the chances of the nestlings surviving. Growth and development of the Asian Paradise Flycatcher were studied during the breeding season from 2005-2009 at Chiang Dao Wildlife Research Station, Chiang Mai Province and Khao Pra-Bang Khram Wildlife Sanctuary, Krabi and Trang Province. About 29 nestlings were measured (length of bill, unflattened wing and tarsus and body-weight) and their plumage development scored. All the measurements were highly correlated with the age of nestlings during their period in the nest except that body weight in the day before fledgling fell slightly. The body sizes of nestlings of Rufous-plumaged males with long central tail feathers (RL) and Rufous-plumaged males with short tails (RS) were also compared. The growth curves of nestlings of RL and RS males were nearly identical and there were no significant differences between them. The plumage developed gradually and was divided into 4 stages. The nestlings opened their eyes fully on day 7-8 and left the nest on day 10-11 before they were able fly properly. The nestlings made a begging call with their neck stretched out to try to reach the parent s bill and their gape opened so that their yellow palate was visible. A successful breeding cycle lasted 24-30 days including 2-4 days of egg-laying, 12-15 days of incubation and 10-11 days of parental care of nestlings in the nest. Fledgling success was 44.4%.
Bird Diversity Relative to Forest Types and Physical Factors at Tung Salang Luang National Park, Thailand
Auttpol Nakwa,Narit Sitasuwan,Araya Jatisatein,Porntip Chantaramongkol
Research Journal of Biological Sciences , 2008,
Abstract: A survey of bird diversity was carried out at Tung Salang Luang National Park in three forest types i.e. mixed forest (seasonal evergreen forest mixed with deciduous dipterocarp forest), seasonal evergreen forest and deciduous dipterocarp forest, during March 2004 to February 2005. The point count mixed line transect methods were used for data collection. The survey found 6,697 birds in total from 140 sp., 35 families and 11 orders occurring in the mixed forest, seasonal evergreen forest and deciduous dipterocarp forest were as follows: 107, 100 and 94 sp. The quantitative bird communities have a negative correlation with climatic changes, as a result, the dynamic pattern of bird populations in the 3 habitats during a year were similar. The fewest species numbers and individual numbers were found during the rainy season and slightly high during the late rainy to early cool seasons. The highest bird populations were found during cool season. Similarity index values of birds in both mixed forest and seasonal evergreen forest were the greatest similar, while both mixed forest and deciduous dipterocarp forest were fewest less similar. The 72.6-78.3% qualitative similarity index values of bird species between study sites was done. Mixed forest had the highest Shannon diversity index 3.9507, followed by deciduous dipterocarp and seasonal evergreen forest were 3.6387 and 3.6025, respectively. The pattern observed suggest that the structure and dynamics of the Tung Salang Luang bird community are strongly liked to physical factors and habitat heterogeneity. Two particular species of bird were observed in this study: Aviceda jerdoni (Jerdon` Baza) and Coracina javensis (Javan Cuckooshrike).
The Effects of Tourists on Bird Diversity in Tourist Area Compared to Restricted Area of Seasonal Evergreen Forest at Tung Salang Luang National Park, Phetchabun Province, Thailand
Auttpol Nakwa,Narit Sitasuwan,Araya Jatisatein,Porntip Chantaramongko
International Journal of Zoological Research , 2008,
Abstract: A survey of bird similarity, diversity and density were carried out at Tung Salang Luang National Park during March 2004 - February 2005, in 3 sites of seasonal evergreen forest, one site in a restricted area (SE1) and two sites in tourist areas (SE2 and SE3). Three sites were located in the same forest structure. The point count and line transect methods were used for data collection. The results revealed the following information: 133 species, 34 families and 11 orders of birds in SE1 (102 species), SE2 (100 species) and SE3 (89 species) were observed. Seven species of birds in all sites i.e. Criniger pallidus, Hypsipetes propinquus, Pycnonotus melanicterus, Irena puella, Garrulax leucolophus, Yuhina zantholeuca and Gracula religiosa were the co-dominant species in this forest that will be used indicator for future investigation. Base on similarity, tourist activities may be disturbed some bird groups in tourist area such as carnivorous and omnivorous (SE2 and SE3) and nectarivorous (SE3); base on densities, carnivorous (SE3), nectarivorous (SE2 and SE3) and garnivorous (SE3) were decreased 46-78 % in tourist sites compared with restricted site (SE1). Moreover, bird diversity index in restricted area was higher value than tourist area. This phenomenon indicated that some bird groups in tourist area at the seasonal evergreen forest had negative effect correlation with human activities and similarity, diversity and density indices were a proper indicator for further impact investigation for conservation and management strategies of avifauna. Finally, this result was the first report about avifauna dynamic of Tung Salang Luang National Park.
Bird Diversity Relative to Forest Types and Physical Factors at Tung Salang Luang National Park, Thailand
Auttpol Nakwa,Narit Sitasuwan,Araya Jatisatein,Porntip Chantaramongkol,Wasun Pupichit,Pornchai Srisakb
Research Journal of Biological Sciences , 2012,
Abstract: A survey of bird diversity was carried out at Tung Salang Luang National Park in three forest types i.e. mixed forest (seasonal evergreen forest mixed with deciduous dipterocarp forest), seasonal evergreen forest and deciduous dipterocarp forest, during March 2004 to February 2005. The point count mixed line transect methods were used for data collection. The survey found 6,697 birds in total from 140 sp., 35 families and 11 orders occurring in the mixed forest, seasonal evergreen forest and deciduous dipterocarp forest were as follows: 107, 100 and 94 sp. The quantitative bird communities have a negative correlation with climatic changes, as a result, the dynamic pattern of bird populations in the 3 habitats during a year were similar. The fewest species numbers and individual numbers were found during the rainy season and slightly high during the late rainy to early cool seasons. The highest bird populations were found during cool season. Similarity index values of birds in both mixed forest and seasonal evergreen forest were the greatest similar, while both mixed forest and deciduous dipterocarp forest were fewest less similar. The 72.6-78.3% qualitative similarity index values of bird species between study sites was done. Mixed forest had the highest Shannon diversity index 3.9507, followed by deciduous dipterocarp and seasonal evergreen forest were 3.6387 and 3.6025, respectively. The pattern observed suggest that the structure and dynamics of the Tung Salang Luang bird community are strongly liked to physical factors and habitat heterogeneity. Two particular species of bird were observed in this study: Aviceda jerdoni (Jerdon` Baza) and Coracina javensis (Javan Cuckooshrike).
Thermodynamic Geometry and Type 0A Black Holes
Narit Pidokrajt,John Ward
Physics , 2011,
Abstract: In this note we study thermodynamic geometry of the type 0A black hole solution in string theory using a variety of different methods (Ruppeiner, Weinhold and Geometrothermodynamics). Our results indicate that the curvature invariants are finite for all physical solutions, suggesting that there is no phase transition. It is also found that the cutoff of the entropy, which is the singular limit of the theory, appears geometrically in the Weinhold picture as the thermodynamic cone itself.
On explicit thermodynamic functions and extremal limits of Myers-Perry black holes
Jan E. Aman,Narit Pidokrajt
Physics , 2010,
Abstract: We study thermodynamic properties of Myers-Perry black holes by deriving explicit fundamental relations from which we can obtain the temperature and specific heat in terms of explicit control parameters in arbitrary dimensions. Using the definition of extremal black holes we establish the generalized Kerr bound in arbitrary dimension. We study thermodynamic geometries of the Myers-Perry black holes with equal angular momenta in arbitrary dimensions and draw thermodynamic cone diagrams which capture the extremal limits of the black holes. Thermodynamic state space is represented geometrically as a wedge embedded in Minkowski space. The opening angle of such a wedge is uniquely determined by the number of spacetime dimensions and the number of angular momenta. Our results can potentially be used to generalize thermodynamic instability analysis and other studies in which extremal limits of the Myers-Perry black holes are required.
Ruppeiner Geometry of Black Hole Thermodynamics
Jan E. Aman,Narit Pidokrajt
Physics , 2007, DOI: 10.1051/eas:0830042
Abstract: The Hessian of the entropy function can be thought of as a metric tensor on state space. In the context of thermodynamical fluctuation theory Ruppeiner has argued that the Riemannian geometry of this metric gives insight into the underlying statistical mechanical system; the claim is supported by numerous examples. We study these geometries for some families of black holes and find that the Ruppeiner geometry is flat for Reissner--Nordstr\"om black holes in any dimension, while curvature singularities occur for the Kerr black holes. Kerr black holes have instead flat Weinhold curvature.
Geometry of Higher-Dimensional Black Hole Thermodynamics
Jan E. Aman,Narit Pidokrajt
Physics , 2005, DOI: 10.1103/PhysRevD.73.024017
Abstract: We investigate thermodynamic curvatures of the Kerr and Reissner-Nordstr\"om (RN) black holes in spacetime dimensions higher than four. These black holes possess thermodynamic geometries similar to those in four dimensional spacetime. The thermodynamic geometries are the Ruppeiner geometry and the conformally related Weinhold geometry. The Ruppeiner geometry for $d=5$ Kerr black hole is curved and divergent in the extremal limit. For $d \geq 6$ Kerr black hole there is no extremality but the Ruppeiner curvature diverges where one suspects that the black hole becomes unstable. The Weinhold geometry of the Kerr black hole in arbitrary dimension is a flat geometry. For RN black hole the Ruppeiner geometry is flat in all spacetime dimensions, whereas its Weinhold geometry is curved. In $d \geq 5$ the Kerr black hole can possess more than one angular momentum. Finally we discuss the Ruppeiner geometry for the Kerr black hole in $d=5$ with double angular momenta.
Critical phenomena and information geometry in black hole physics
Jan E. Aman,Narit Pidokrajt
Physics , 2010, DOI: 10.1088/1742-6596/229/1/012060
Abstract: We discuss the use of information geometry in black hole physics and present the outcomes. The type of information geometry we utilize in this approach is the thermodynamic (Ruppeiner) geometry defined on the state space of a given thermodynamic system in equilibrium. The Ruppeiner geometry can be used to analyze stability and critical phenomena in black hole physics with results consistent with those from the Poincare stability analysis for black holes and black rings. Furthermore other physical phenomena are well encoded in the Ruppeiner metric such as the sign of specific heat and the extremality of the solutions. The black hole families we discuss in particular in this manuscript are the Myers-Perry black holes.
Geometry of black hole thermodynamics
Jan Aman,Ingemar Bengtsson,Narit Pidokrajt
Physics , 2003, DOI: 10.1023/A:1026058111582
Abstract: The Hessian of the entropy function can be thought of as a metric tensor on the state space. In the context of thermodynamical fluctuation theory Ruppeiner has argued that the Riemannian geometry of this metric gives insight into the underlying statistical mechanical system; the claim is supported by numerous examples. We study this geometry for some families of black holes. It is flat for the BTZ and Reissner-Nordstrom black holes, while curvature singularities occur for the Reissner-Nordstrom-anti-de Sitter and Kerr black holes.
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