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匹配条件: “Shijo Joseph” ,找到相关结果约10751条。
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Potential for Community and Conservation Reserves in the Western Ghats, India
Arun Kanagavel,Shijo Joseph,Revati Pandya,Rajeev Raghavan
Asian Journal of Conservation Biology , 2013,
Abstract: Protected Areas represent the world’s economic and political commitment towards the conservation of biodiversity. The Western Ghats (WG) in peninsular India, part of the Western Ghats-Sri Lanka Hotspot has the highest human population density and population pressure in the world and is in need of urgent conservation attention. Community Reserves and Conservation Reserves are protected area systems in India which integrate local communities as well as private organisations into protected area management. The potential for Community and Conservation Reserves was evaluated at 25 reserve forests and privately owned/leased forest fragments at Kodaikanal, Theni and Valparai, which are limited-access areas in the human-dominated landscape of the southern WG. Data collection at each site, on a range of issues, was based upon the characteristics of local communities which would be central to the integration of resource-use, community participation and biodiversity conservation. The sites where local communities preferred to participate in protected area management were further prioritized through ranking them for the variables and index calculated. Sixteen potential, community and conservation reserves were subsequently identified and prioritised. An analysis of the perceptions, of forest department officials and conservation researchers, towards the establishment of such reserves revealed that they were unsure whether these reserve systems would be beneficial for biodiversity conservation.
Mapping and Inventory of Forest Fires in Andhra Pradesh, India: Current Status and Conservation Needs
C. Sudhakar Reddy,P. Hari Krishna,K. Anitha,Shijo Joseph
ISRN Forestry , 2012, DOI: 10.5402/2012/380412
Abstract:
Mapping and Inventory of Forest Fires in Andhra Pradesh, India: Current Status and Conservation Needs
C. Sudhakar Reddy,P. Hari Krishna,K. Anitha,Shijo Joseph
ISRN Forestry , 2012, DOI: 10.5402/2012/380412
Abstract: Analyzing the spatial extent and distribution of forest fires is essential for sustainable forest management. The present study appraises the distribution of forest fires in one of the largest states in India, Andhra Pradesh, using satellite remote sensing. Advanced Wide Field Sensor (AWiFS) onboard on Indian Remote Sensing Satellite (IRS P6) was used for mapping and analyzing the spatial extent of burnt areas. Comparative analysis was carried out with respect to different forest types, protected areas and across elevation zones to demarcate and identify the fire-affected areas. The results show that about 19% (8594?km2) of forest area were burnt in the state during 2009. Burnt area statistics for Protected Areas reveal that 24% of forest cover was affected by fire. Nagarjunasagar Srisailam Tiger Reserve, the largest tiger reserve of the country, shows an area of 793?km2 (22%) under forest fire. Higher elevation areas which are predominantly dominated by savannah and woodlands experienced higher fire occurrence in comparison with lower elevation areas. Similarly, fires were prevalent near edges compared to core forest. Results of the study suggested that forests of Andhra Pradesh are prone to high fire occurrences and current fire regime poses a severe conservation threat to biodiversity both within and outside the Protected Areas. 1. Introduction Fires affect the species composition, structure, pattern of vegetation, biomass, and consequently cause significant damage to the tropical forests [1, 2]. Globally, more than 350 million ha of forests were burned in 2000, an area of nearly equal to the size of India [3]. In many tropical deciduous ecosystems, fire is part of the natural regeneration process, stimulating the germination of certain species (Teak) and clearing space for the invasion [4]. Increased burn frequencies can therefore progressively weed out more fire-vulnerable components of biodiversity. Frequent fires may cause mortality of smaller trees, opening up the canopy and leading to the gradual conversion of once-closed forests to woodland savannahs with low tree density and a grassy understory [5]. In India, large areas of tropical dry forests have already been converted to grasslands or other land use as a result of fire and other practices [6, 7]. According to the Ministry of Environment and Forests, Government of India, 3.73?Mha of forests are affected by fires annually in India [8]. The extent of these fires depends on various factors such as the frequency of human disturbances and the climate of the region [9]. Forest dependent
Rainfall and Elevation Influence the Local-Scale Distribution of Tree Community in the Southern Region of Western Ghats Biodiversity Hotspot (India)
Shijo Joseph,K. Anitha,V. K. Srivastava,Ch. Sudhakar Reddy,A. P. Thomas,M. S. R. Murthy
International Journal of Forestry Research , 2012, DOI: 10.1155/2012/576502
Abstract: The present study characterises the tree communities with respect to topographic and climatic variables and identifies the most important environmental correlate of species richness in the southern region of Western Ghats Biodiversity Hotspot, India. Digitally derived environmental variables in combination with tree species richness information were analysed using Canonical Correspondence Analysis (CCA) to characterise the communities. Multiple regression technique based on stepwise backward elimination was used to identify the most important environment correlate of species richness. Canonical correspondence analysis results in six major tree communities along the first and second axes. Rainfall is the dominant environmental gradient influencing vegetation patterns on the first CCA axis while elevation showed the highest correlation with the second CCA axis. Backward elimination regression technique yielded rainfall as the most important environmental correlate of species richness. Results were in agreement with the observations in the Neotropics that rainier areas maintain high species diversity. 1. Introduction Tropical forests are unique in many aspects such as high diversity [1], high standing biomass and carbon storage [2], and global net primary productivity [3].There have been many attempts to understand the structural complexity and species diversity of these ecosystems spanning over three decades [1, 4–11]. While a complete perception of the tropical forest still remains a challenge, the degradation and deforestation is hastening on the other side. Information on distribution of tree communities along environmental gradients has vital role in understanding their ecology as well as their conservation and management.Quantification of such species-environment relationships yields valuable insights into ecological processes such as resource partitioning and niche differentiation [12] and forms the core of predictive geographical modelling in ecology [13]. Today’s concern about biodiversity losses and ecosystem services suggest that forest classifications based on species composition are needed, along with the information on how many species are shared between different forest types. This information in combination with the key environmental correlates is important for natural reserve area planning and management under global change scenarios. The importance of climate to map animal and plant distribution was recognized during the early stages of nineteenth century [14]. Climate in combination with other physical elements of the environment has
A review of experimental investigations on thermal phenomena in nanofluids
Thomas Shijo,Balakrishna Panicker Sobhan Choondal
Nanoscale Research Letters , 2011,
Abstract: Nanoparticle suspensions (nanofluids) have been recommended as a promising option for various engineering applications, due to the observed enhancement of thermophysical properties and improvement in the effectiveness of thermal phenomena. A number of investigations have been reported in the recent past, in order to quantify the thermo-fluidic behavior of nanofluids. This review is focused on examining and comparing the measurements of convective heat transfer and phase change in nanofluids, with an emphasis on the experimental techniques employed to measure the effective thermal conductivity, as well as to characterize the thermal performance of systems involving nanofluids.
Synthesis of Petroleum-Based Fuel from Waste Plastics and Performance Analysis in a CI Engine
Christine Cleetus,Shijo Thomas,Soney Varghese
Journal of Energy , 2013, DOI: 10.1155/2013/608797
Abstract: The present work involves the synthesis of a petroleum-based fuel by the catalytic pyrolysis of waste plastics. Catalytic pyrolysis involves the degradation of the polymeric materials by heating them in the absence of oxygen and in the presence of a catalyst. In the present study different oil samples are produced using different catalysts under different reaction conditions from waste plastics. The synthesized oil samples are subjected to a parametric study based on the oil yield, selectivity of the oil, fuel properties, and reaction temperature. Depending on the results from the above study, an optimization of the catalyst and reaction conditions was done. Gas chromatography-mass spectrometry of the selected optimized sample was done to find out its chemical composition. Finally, performance analysis of the selected oil sample was carried out on a compression ignition (CI) engine. Polythene bags are selected as the source of waste plastics. The catalysts used for the study include silica, alumina, Y zeolite, barium carbonate, zeolite, and their combinations. The pyrolysis reaction was carried at polymer to catalyst ratio of 10?:?1. The reaction temperature ranges between 400°C and 550°C. The inert atmosphere for the pyrolysis was provided by using nitrogen as a carrier gas. 1. Introduction In the recent years it is quite common to find in newspapers and publications that plastics are turning out to be a menace. Days are not so far when earth will be completely covered with plastics and humans will be living over it. All the reasoning and arguments for and against plastics finally land up on the fact that plastics are nonbiodegradable in nature. The disposal and decomposition of plastics has been an issue which has caused a number of research works to be carried out in this regard. Currently the disposal methods employed are land filling, mechanical recycling, biological recycling, thermal recycling, and chemical recycling. Of these methods, chemical recycling is a research field which is gaining much interest recently, as it turns out to be that the products formed in this method are highly advantageous. Plastic is one such commodity that has been so extensively used and is sometimes referred to as one of the greatest innovations of the millennium. There are a numerous ways in which plastic is and will continue to be used. The plastic has achieved such an extensive market due to fact that it is lightweight, cheap, flexible, reusable, do not rust or rot, and so forth. Because of this, plastics production has gone up by almost 10% every year on a global
Enhanced Superconductivity on the Tetragonal Lattice in FeSe under Hydrostatic Pressure
Kiyotaka Miyoshi,Koh Morishita,Eriko Mutou,Masatoshi Kondo,Osamu Seida,Kenji Fujiwara,Jun Takeuchi,Shijo Nishigori
Physics , 2013, DOI: 10.7566/JPSJ.83.013702
Abstract: Superconductivity under pressure in FeSe ($T_{\rm c}$$\sim$7.5 K) has been investigated using single-crystal specimens through the measurements of DC magnetization and electrical resistivity. A characteristic three-step increase in $T_{\rm c}$ has been found under hydrostatic pressure up to $\sim$34 K above 7 GPa. The structural transition from a tetragonal phase to an orthorhombic phase ($T_{\rm s}$$\sim$87 K) is found to disappear at $P$$\sim$2.3 GPa, above which $T_{\rm c}$ increases rapidly, suggesting that the superconductivity is enhanced by the tetragonal environment. Under non-hydrostatic pressure, the increase in $T_{\rm c}$ is suppressed and the superconductive volume fraction is considerably reduced above 2 GPa, probably owing to the breaking of the tetragonal lattice symmetry by the uniaxial stress. The intimate correlation between the enhanced (suppressed) superconductivity and the tetragonality (orthorhombicity) in the phase diagram is a common feature of FeSe and other iron-pnictide superconductors.
Stationary Super-Gravitational States  [PDF]
Joseph Towe
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.21007
Abstract: The string background AdS7XS4 is adopted and the early universe is modeled in the eleven dimensional SUGRA theory that is dual to this background. Specifically the ground state of the vacuum is associated with an arbitrary distribution of closed, spin-2 strings, and excited states are modeled as geometric combinations of individual strings. Combinations or combining iterations are, by hypothesis, admissible or geometric if each iteration intrinsically incorporates the metrical scale that is assigned to the individual spin-2 string. It is demonstrated that a generalization of this process, if appropriately calibrated, establishes theoretical fermionic masses that correspond approximately to observed values. The proposed model also predicts a new quark of mass .
Using Multimedia Case Development as a Critical Reflective Tool for Revitalizing School Stakeholders’ Organizational Learning  [PDF]
Joseph Claudet
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23028
Abstract: This article reports design and development efforts associated with one school-university collaborative partnership project focused on assisting K-12 school community stakeholders struggling with difficult school improvement challenges learn how to reinvent themselves as organizational teams to engage effectively in positive school change and renewal. The project employs an alternative, immersive organizational learning design in conjunction with available multimedia technology to leverage stakeholders’ own lived experiences and leadership challenges as opportunities to engage school community participants in a unique organizational case development and team learning adventure. Multimedia case development and production activities involving school community stakeholders in one elementary school are highlighted. Insights derived from the use of multimedia case development as an organizational leading and learning tool for educators and other stakeholders in school communities are discussed.
The Photon Wave Function  [PDF]
Joseph Cugnon
Open Journal of Microphysics (OJM) , 2011, DOI: 10.4236/ojm.2011.13008
Abstract: The properties of a wave equation for a six-component wave function of a photon are re-analyzed. It is shown that the wave equation presents all the properties required by quantum mechanics, except for the ones that are linked with the definition of the position operator. The situation is contrasted with the three-component formulation based on the Riemann-Silberstein wave function. The inconsistency of the latter with the principles of quantum mechanics is shown to arise from the usual interpretation of the wave function. Finally, the Lorentz invariance of the six-component wave equation is demonstrated explicitly for Lorentz boosts and space inversion.
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