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匹配条件: “Namita Brahma” ,找到相关结果约154条。
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Association of Critically Endangered Bengal Florican with other bird species in two sites of Manas, Assam, India
Namita Brahma,P.C. Bhattacharjee,B. P. Lahkar
Asian Journal of Conservation Biology , 2013,
Abstract: Birds and animals group together for diverse benefits, including anti-predator, foraging, and reproductive advantages. Present study is aimed to know association of Bengal florican with other bird species found in two different habitats, one is natural and other human intervened based on association analysis in Manas National Park and understand potential benefits derived from these associations. This study was carried out in two site one in natural habitat of Bengal florican Kuribeel inside Manas National Park and other one in Koklabari Agricultural Farm outside Manas National Park which is man made habitat. Study was conducted from morning 0530 - 1000 hrs and afternoon 1500 hrs - 1700 hrs in 100 m radius circular plots, centre on the interactions of 50 m by 50 m regular grid in Bengal florican territories. Fourteen bird species found to associate with Bengal florican, of which nine species in Kuribeel, and thirteen species of birds in Koklabari seed farm. From association analysis, it is found that Bengal florican had stronger interspecific associations with Indian peafowl in the natural habitat (Kuribeel). However, in Kokalabari seed farm Bengal florican was found to associate with Red wattle lapwing. In this study, association strengths of Bengal florican with other bird species follow different trends in the two study sites.
Estimation of the Effect of Anisotropy on Young’s Moduli and Poisson’s Ratios of Sedimentary Rocks Using Core Samples in Western and Central Part of Tripura, India  [PDF]
Jwngsar Brahma, Anirbid Sircar
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.52020
Abstract:

The velocity anisotropy parameters and elastic constants play a very important role to estimate Young’s modulus and Poisson’s ratios accurately. For geomechanics applications such as hydraulic fracturing design, analysis of wellbore stability and rock failure, determination of in situ stress and assessment of the response of reservoirs and surrounding rocks to changes in pore pressure and stress, Young’s modulus and Poisson’s ratios play a very important role. Four rock samples were collected from four different wells situated in study area. The ultrasonic transmission method has been used to measure P-wave, Sh-wave and Sv-wave travel times as a function of orientation and confining pressure. The five independent stiffnesses constants, Young’s moduli, Poisson’s ratios and Bulk moduli of the samples were estimated. The Poisson’s ratios (\"\" and \"\") are varying as the confining pressure is changed. The axial strain is larger than the lateral strain, resulting \"\". For shales, the Young’s modulus measured parallel to bedding E1 is usually greater than the Young’s modulus measured perpendicular to bedding E3. Through this study it has been observed that, there is a strong effect of anisotropy parameters on Young’s modulus and Poisson’s ratio.

Possible Mosquito Control by Silver Nanoparticles Synthesized by Soil Fungus (Aspergillus niger 2587)  [PDF]
Namita Soni, Soam Prakash
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.22021
Abstract:

Here, we have synthesized the silver nanoparticles (AgNPs) by using the soil fungus Aspergillus niger 2587. The results recorded from UV-vis spectrophotometer and transmission electron microscopy (TEM) support the biosynthesis and characterization of AgNPs. The synthesized silver nanoparticles have also been tested against the larvae and pupae of Anopheles stephensi, Culex quinquefasciatus and Aedes aegypti. The efficacy test was performed at different concentrations for a period of different hours by the probit analysis. The larvae of Cx. quinquefasciatus have shown the 100% mortality to the synthesized AgNPs after 1 h of exposure, while the larvae of An. stephensi and Ae. aegypti were found less susceptible to the synthesized AgNPs. The pupa of Ae. aegypti has shown the efficacy LC50 4, LC90 12 and LC99 19 ppm after 2 h of exposure of the synthesized AgNPs, while, the pupae of Cx. quinquefasciatus and An. stephensi were found less susceptible to the synthesized AgNPs. By this approach, it is suggestive that this rapid synthesis of nanoparticles would be proper for developing a biological process for mosquito control.

First and Second Order Statistics Features for Classification of Magnetic Resonance Brain Images  [PDF]
Namita Aggarwal, R. K. Agrawal
Journal of Signal and Information Processing (JSIP) , 2012, DOI: 10.4236/jsip.2012.32019
Abstract: In literature, features based on First and Second Order Statistics that characterizes textures are used for classification of images. Features based on statistics of texture provide far less number of relevant and distinguishable features in comparison to existing methods based on wavelet transformation. In this paper, we investigated performance of texture-based features in comparison to wavelet-based features with commonly used classifiers for the classification of Alzheimer’s disease based on T2-weighted MRI brain image. The performance is evaluated in terms of sensitivity, specificity, accuracy, training and testing time. Experiments are performed on publicly available medical brain images. Experimental results show that the performance with First and Second Order Statistics based features is significantly better in comparison to existing methods based on wavelet transformation in terms of all performance measures for all classifiers.
Schatten Class Toeplitz Operators on the Bergman Space
Namita Das
International Journal of Mathematics and Mathematical Sciences , 2009, DOI: 10.1155/2009/921324
Abstract: We have shown that if the Toeplitz operator on the Bergman space 2() belongs to the Schatten class ,1≤<∞, then ∈(,), where  is the Berezin transform of ,()=()/(1?||2)2, and () is the normalized area measure on the open unit disk . Further, if ∈(,) then ∈(,) and ∈. For certain subclasses of ∞(), necessary and sufficient conditions characterizing Schatten class Toeplitz operators are also obtained.
THEORY OF PLASTICO ML IN γ–IRRADIATED ALKALI HALIDE CRYSTALS
NAMITA RAJPUT
International Journal of Engineering Science and Technology , 2011,
Abstract: The present paper reports the results of some theoretical approach made to the studies of mechanoluminescence (ML) in coloured alkali halide crystals. It is shown that moving dislocations produced during plastic deformation of crystalline materials cause light emission due to several processes like mechanical or electrostatic interaction of dislocations with defect centres, the dielectric breakdown of adsorbed gaseous molecules by the surface accumulated dislocation charges, the generation of holes during decay of mobile dislocations on the surfaces of crystals, etc. On the basis of rate equations, expressions are derived for the rise and decay of ML intensity at a given strain rate. The estimated values of ML intensities for different crystals are found to be comparable with the experimentally observed values. The expression derived are able to explain the dependence of ML intensity on several parameters like strain-rate, defect centre density, temperature, applied stress, crystal- size etc.
John locke on personal identity
Namita Nimbalkar
Mens Sana Monographs , 2011,
Abstract: John Locke speaks of personal identity and survival of consciousness after death. A criterion of personal identity through time is given. Such a criterion specifies, insofar as that is possible, the necessary and sufficient conditions for the survival of persons. John Locke holds that personal identity is a matter of psychological continuity. He considered personal identity (or the self) to be founded on consciousness (viz. memory), and not on the substance of either the soul or the body.
John locke on personal identity
Nimbalkar Namita
Mens Sana Monographs , 2011,
Abstract: John Locke speaks of personal identity and survival of consciousness after death. A criterion of personal identity through time is given. Such a criterion specifies, insofar as that is possible, the necessary and sufficient conditions for the survival of persons. John Locke holds that personal identity is a matter of psychological continuity. He considered personal identity (or the self) to be founded on consciousness (viz. memory), and not on the substance of either the soul or the body.
CLOCKING STRATEGIES IN HIGH SPEED I/O USING PLL
Namita Jain
Journal of Global Research in Computer Science , 2012,
Abstract: The normal clocking strategies are not applicable at very high frequencies due to the signal integrity problems. The speed of any high speed circuit is ultimately determined by the I/O circuits associated with it. This paper describes a comparison between different clocking strategies and gives a range of application of these. During 1970-1990, gates switched so slowly that - digital signals actually looked like ones and zeros. Analog modeling of signal propagation was not necessary. At today’s speeds the simple, passive elements of a system viz, Wires, PC boards traces, Connectors, and Chip Packages - make up a significant part of the overall signal delay. Further these elements cause glitches, resets, logic errors, and other problems. As the designs are pushed towards higher operating speeds. For high-performance boards, MCMs and systems, interconnect design must be specified and driven from electrical requirements to: (1)Meet setup and hold times & guarantee signal integrity (2)Avoid design / layout / verification iterations (3)Ensure low manufacturing costs and high reliability The conventional signaling technique, called Common Clock (CC) signaling [support by reference], relies on a single system clock distributed to all bus agents as a common reference. All transactions are performed latch-to-latch using this common clock reference. Trace propagation delays are governed by trace length. Trace lengths are often governed by the thermal solution. As speeds increase, heat sinks get larger and force components farther away from each other, which limit the speed of a common-clock bus design. Source-Synchronous clocking refers to the technique of sourcing a clock along with the data. Specifically, the timing of unidirectional data signals is referenced to a clock (often called the strobe) sourced by the same device that generates those signals, and not to a global clock (i.e. generated by a bus master). A reason that source-synchronous clocking is useful is that it has been observed that all of the circuits within a given semiconductor device experience roughly the same process-voltage-temperature (PVT) variation. This means signal propagation delay experienced by the data through a device tracks the delay experienced by the clock through that same device over PVT A more radical approach for reducing the clocking overhead is to eliminate the clock entirely. Such designs are called self-timed designs. Self-timed systems provide completion information along with their data values. This completion information controls the sequencing of data through the mac
Optimisation of extrusion cooking conditions and characterization of rice (Oryza sativa)—Sweet potato (Ipomoea batatas) and rice-yam (Dioscorea alata) based RTE products  [PDF]
Elina Brahma Hazarika, Anjan Borah, Charu Lata Mahanta
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.49B003
Abstract:  Extrusion cooking has been extensively used toproduce variety of foods like ready to eatbreakfast cereals, baby foods, snack foods, etc. Taking rice flour as the base ingredient, two locally available tuberous root vegetables, greater yam(Dioscoreaalata) and sweet potato (Ipomoeabatatas) were used in this study for the development of ready-to-eat breakfast products in asingle screw extruder. During extrusion cooking, the screw speeds ranged from 132 to 468 rpm and the barrel temperatures ranged from 103°C to 137°C. The extrudates were then analyzed for various physical and physicochemical properties. Optimization was done following ResponseSurface Methodology (RSM) using CentralComposite Design. Using screw speed, barrel temperature and feed composition as the three independent variables, the three responses taken were bulk density, expansion index and breaking strength. The optimized conditions wereused for developing 3 new products one of which alsocontained tomato pulp powder. The productswere analyzed for their physical, proximate, sensoryand antioxidant properties. There was significantcolour change in all the three samples as indicated by total colour change (ΔE). Texture analysis of the extrudate samples showed hardness values ranging from 28.68 N to 47.57 N. Amylose content was found to be 15.3% in rice-sweet potato extrudate, 14.7% in rice-yam extrudate and 18.2% in rice-sweet potato-tomato extrudate. The antioxidant profile of the extrudates studiedthrough DPPH (2,2-diphenyl-picryhydrazyl)scavenging activity and FRAP (ferric reducing antioxidant property) showed that the antioxidant

capacity in all the 3 extrudates was very low. Rice flour incorporated with sweet potato wasjudged the best on sensory evaluation. Thestudy has shown that both sweet potato and greater yam tubers can be commercially exploited for the development of ready-to-eat (RTE) products.

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