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Search Results: 1 - 10 of 7321 matches for " Vishakha Gupta "
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Reflection and Transmission Phenomena in Poroelastic Plate Sandwiched between Fluid Half Space and Porous Piezoelectric Half Space
Vishakha Gupta,Anil K. Vashishth
Smart Materials Research , 2013, DOI: 10.1155/2013/767019
Abstract: The reflection and transmission of elastic waves in porous piezoelectric plate, overlying a porous piezoelectric half space and underlying a fluid half space, is studied. The constitutive and governing equations are formulated for porous piezoelectric materials. The expressions for the mechanical displacements, electric displacements, stresses, and electric potentials are derived for porous piezoelectric plate, porous piezoelectric half space, and fluid half space. The boundary conditions are described for the studied model. The behaviour of reflected and transmitted amplitude ratios relative to frequency, incident angle, thickness, and porosity is observed numerically. The impedance mismatching problem between the dense piezoelectric materials and the surrounding medium can be solved by the inclusion of porosity in dense piezoceramics. 1. Introduction The field of smart materials (piezoelectric) has advanced rapidly due to an increasing awareness about capabilities of such materials, the development of new materials and transducer designs, and increasingly stringent design and control specifications in aerospace, aeronautics, industrial, automotive, biomedical, and nanosystems. Piezoelectric materials are brittle in nature which leads to the failure of devices. It is commonly found that 5% porosity exists in piezoelectric materials which are considered as manufacturing defects. Instead of considering it as a manufacturing defect, such materials can be modelled as porous piezoelectric materials. Porous piezoelectric materials are widely used in ultrasonic transducers, hydrophones, and pressure sensors. Porous ceramics are of interest for ultrasonic transducer applications. Porosity allows to decrease the acoustic impedance, thus improving transfer of acoustic energy to water or biological tissues. For underwater applications, the figure of merit can also be improved as compared to dense material. The surface impedance of porous piezoelectric materials is less as compared to dense piezoelectric materials. Alvarez-Arenas and De Espinosa [1] made a study related to characterization of porous piezoelectric ceramic. The experimental study on wave propagation in composite structures was done by Alvarez-Arenas et al. [2]. Different authors [3, 4] developed models related to synthesis, fabrication, and processing of porous piezoelectric materials. Kumar et al. [5] investigated the effects of porosity and pore forming agents in porous piezoceramics. The influence of piezoelectricity on the reflection-transmission phenomena in fluid-loaded piezoelectric half
Nodal Spine Pairs Present in the Mimosoid Prosopis juliflora Are Not Stipules but Define a Distinct Class of Lateral Organs  [PDF]
Vishakha Sharma, Sushil Kumar
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.38140
Abstract: The descriptions of Prosopis juliflora of subfamily mimosoideae in the family leguminosae, given in the floras of arid and semi-arid regions of the world, including the flora of Delhi, state that the spine pairs seen in association with compound leaf on nodes are stipules. The suggestions that spines are stipules were tested by morphological and histological examination of nodes of P. juliflora plants growing in the Arawalli range at New Delhi. The nascent nodes on growing branches of P. juliflora were observed to produce a pair of knife-like free bifacial stipules together with a leaf and a pair of spines. The stipules were missing from the mature nodes of the same branches whose young nodes carried stipule pairs, suggesting that the stipules were deciduous whereas leaves and spines were persistent. Anatomically, spines were observed to be appendages to stem and located adjacent to leaf petiole away from stipules. Vasculature of stipules was independent. The observations allowed the conclusion that P. juliflora nodes form regular stipules and spines produced on them are stem-like distinct lateral organs. It is suggested that nodal spine pairs borne on plant nodes in general are lateral organs different from stipules, leaves and secondary inflorescences.
Implementing Kalman Filter in GPS Navigation
Prof. Kanika Gupta,,Ms. Apurva,,Ms. Priya Jindal,,Ms. Vishakha Snehi
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: This paper describes about the increase in efficiency of the GPS Navigation System when conventional tracking loops are replaced by the Kalman Filter. The Kalman Filter is a recursive algorithm that helps in reducing the square root of the error in the non-linear and noisy dynamic systems. The approach is also called Digital Filtering, more precisely - Adaptive Filtering. The paper highlights various errors in the GPS Systems and describes how Kalman Filter can effectively reduce them. The various kinds of errors are ionospheric error, tropospheric error, onboard clock error, that is, error in the satellite’s clock, receiver clock error, ephemeris data errors, that is, small error in the position of the satellite. We aim at reducing such errors by using the Extended Kalman Filter. The Kalman Gain coefficient is the most important component of the entire algorithm. It will we multiplied with the error residuals iteratively, which will reduce the error value in the final readings eventually. Also, by replacing conventional looping, which provides accurate readings after 3rd or 4th iteration, with the Kalman Filter will provide the accurate readings before so many iterations which will reduce the delay. As a result, the new GPS Navigation system will provide much accurate and faster readings to the user.
Mutation of NPM1 and FLT3 Genes in Acute Myeloid Leukemia and Their Association with Clinical and Immunophenotypic Features
Pradeep Singh Chauhan,Rakhshan Ihsan,L. C. Singh,Dipendra Kumar Gupta,Vishakha Mittal,Sujala Kapur
Disease Markers , 2013, DOI: 10.1155/2013/582569
Abstract: Background. Mutations in NPM1 and FLT3 genes represent the most frequent genetic alterations and important diagnostic and prognostic indicators in patients with acute myeloid leukemia (AML). Objective. We investigated the prevalence and clinical characteristics of NPM1 and FLT3 mutations in 161 patients of de novo AML including adults and children. Results. NPM1 mutation was found in 21% and FLT3 mutation in 25% of the AML patients. Thirteen (8%) samples were positive for both NPM1 and FLT3/ITD mutations. Adult patients had significantly higher frequency of NPM1 mutation than children (25.8% versus 8.8%; ). Further, NPM1 mutation was found to be more frequent in patients above 45 years of age ( ). NPM1 mutation was significantly associated with higher platelet count ( ) and absence of hepatosplenomegaly ( ), while FLT3/ITD mutation was associated with higher white blood count ( ). Immunophenotypically, NPM1 mutation was associated with the lack of CD34 ( ) and HLD-DR expression ( ), while FLT3/ITD mutation was positively associated with the expression of CD7 ( ). No correlation was found between NPM1 mutation and fusion gene. Interestingly, FLT3/ITD mutation was found to be inversely associated with AML/ETO fusion gene ( ). Conclusions. The results suggest that distinct clinical and immunophenotypic characteristics of NPM1 and FLT3/ITD mutations present further insight into the molecular mechanism of leukemogenesis. 1. Introduction Acute myeloid leukemia (AML) develops from malignant transformation of immature hematopoietic cells through a complex multistep process that requires cooperation of different types of genetic alterations [1]. Alterations associated with AML include recurrent fusion genes such as t(8; 21), inv(16), and t(15; 17) that affect transcription factors or components of the transcriptional coactivation complex, resulting in impaired differentiation and/or aberrant self-renewal capacity by hematopoietic progenitors. In addition to these, a group that comprises mutation in genes involved in the proliferation and survival potential of hematopoietic progenitors includes receptor tyrosine kinases (FLT3, KIT, and RAS), oncogenic transcription factor (CEBP/alpha), and nucleophosmin (NPM1) mutation. Many of these gene mutations figure importantly as a provisional clinicopathologic entity in the revised World Health Organization (WHO) 2008 classification of myeloid neoplasms [2]. Fms-like tyrosine kinase-3 (FLT3) is a class III receptor tyrosine kinase located on chromosome 13q12. Wild-type FLT3 mRNA is expressed on normal hematopoietic stem
Wind Energy Generation and Assessment of Resources in India  [PDF]
Vishakha Tank, Jignasha Bhutka, T. Harinarayana
Journal of Power and Energy Engineering (JPEE) , 2016, DOI: 10.4236/jpee.2016.410002
Abstract: The gap between energy demand and its generation is constantly widening. People have started giving more emphasis on renewable sources of energy. This paper presents the estimation of potential for wind energy generation maps based on fixed wind turbine capacity. Although wind energy has developed substantially in recent years, we have only wind speed and wind potential density maps. Our attempt here is to generate wind energy generation potential maps. Major step in achieving this goal is modeling of wind energy conversion system using TRNSYS software. The model consists of three main components namely the weather, the turbines and energy conversion parameters. The weather data are provided from the meteorological database, namely Meteonorm. The simulated output is compared with actual wind generation of wind farms. After comparing our model results with the existing wind energy generation data, we have extended to compute the wind energy generation for all locations in India. For simulation, 4691 locations are identified considering 0.25° × 0.25° interval. The energy generation simulated data are compiled and developed into maps that are useful to all wind energy developers. The data generated and presented in the form of maps are for all the 30 states of India.
Metabiotics: The Functional Metabolic Signatures of Probiotics: Current State-of-Art and Future Research Priorities—Metabiotics: Probiotics Effector Molecules  [PDF]
Aarti Singh, Vishakha Vishwakarma, Barkha Singhal
Advances in Bioscience and Biotechnology (ABB) , 2018, DOI: 10.4236/abb.2018.94012
Abstract: The intricate “orchestered molecular conversation” between the host and gut microbiome is one of the most dynamic research areas in recent years. The rhythmic chemical cross talk in the form of bioactive metabolites and signalling molecules synthesized by gut microbiome plays a significant role for the modulation of human health in diversified ways. They are recognized as low molecular weight (LMW) molecules having versatile chemical attributes. They possess magnificent capability of interacting with surrounding environment and controlling the genes for various genetic, biochemical and physiological functions for maintaining the homeostasis that is now-a-days termed as “small molecules microbes originated (SMOM) homeostasis” in the host. These metabolic signatures have close structural and functional resemblance with small molecules synthesized by host eukaryotic cells and dietary components. Therefore, they may be considered as universalized metabolites contributing to the remarkable phenomenon of epigenetic regulation, cell to cell communication and stability of genome manifesting the overall growth and development of the host and known as “metabiotics”. The wide panorama of utilization of probiotics is continuously expanding and conferring the major health benefits through metabiotic components are gaining tremendous momentum therefore recognized as “hidden soldiers” of the body. Therefore firstly, we outline the need and types of metabiotic molecules and depicting their role in human health. Then, we summarize their preventive and therapeutic avenues in various diseases and finally, we propose the current technological interventions, bottlenecks and future perspectives in this field that are implied for accelerating their comprehensive understanding and utilization at industrial scale.
A study on intangible assets disclosure: An evidence from Indian companies A study on intangible assets disclosure: An evidence from Indian companies A study on intangible assets disclosure: An evidence from Indian companies
Subash Chander,Vishakha Mehra
Intangible Capital , 2011, DOI: 10.3926/ic.198
Abstract: Purpose: India has emerged at the top of the pedestal in the present knowledge-driven global marketplace, where intangible assets hold much more value than physical assets. The objective of this study is to determine the extent of intangible asset disclosure by companies in India Design/methodology/approach: This study relates to the years 2003-04 and 2007-08 and is based on 243 companies selected from BT-500 companies. The annual reports of these companies were analyzed using content analysis so as to examine the level of disclosure of intangible asset information. Intangible assets disclosure index based on the intangible assets framework as given by Sveiby (1997) and as used and tested by Guthrie and Petty (2000) and many other subsequent studies was modified and used for this study. Findings: The results showed that external capital is the most disclosed intangible asset category with a disclosure score of 37.90% and 35.83% in the years 2003-04 and 2007-08 respectively. Infosys technologies Ltd. is the company with the highest intangible assets reporting for both the years (2003-04: 68.52%, 2007-08: 81.48%). Further the reporting of intangible assets is unorganized and unsystematic. There is lack of appropriate framework for disclosing intangible assets information in the annual reports. Originality/value: This is perhaps the first comprehensive study on intangible assets disclosure based on a large sample of the companies from India. Literature reveals that now the intangible assets play relatively an increasingly significant role in the decision making process of various users of corporate reports. This study shows that the overall disclosure of intangible assets is low in India. Thus this study may be of value to the corporate sector in India to explore the areas of intangible assets disclosure so that they can provide useful and relevant information to the users of annual reports. Purpose: India has emerged at the top of the pedestal in the present knowledge-driven global marketplace, where intangible assets hold much more value than physical assets. The objective of this study is to determine the extent of intangible asset disclosure by companies in India Design/methodology/approach: This study relates to the years 2003-04 and 2007-08 and is based on 243 companies selected from BT-500 companies. The annual reports of these companies were analyzed using content analysis so as to examine the level of disclosure of intangible asset information. Intangible assets disclosure index based on the intangible assets framework as given by Sveiby (1997) and
On Equality of Certain Automorphism Groups
Surjeet Kour,Vishakha
Mathematics , 2015,
Abstract: Let $G = H\times A$ be a finite group, where $H$ is a purely non-abelian subgroup of $G$ and $A$ is a non-trivial abelian factor of $G$. Then, for $n \geq 2$, we show that there exists an isomorphism $\phi : Aut_{Z(G)}^{\gamma_{n}(G)}(G) \rightarrow Aut_{Z(H)}^{\gamma_{n}(H)}(H)$ such that $\phi(Aut_{c}^{n-1}(G))=Aut_{c}^{n-1}(H)$. We also give some necessary and sufficient conditions on a finite $p$-group $G$ such that $Autcent(G)=Aut_{c}^{n-1}(G)$ . Furthermore, for a finite non-abelian $p$-group $G$, we give some necessary and sufficient conditions for $Aut_{Z(G)}^{\gamma_{n}(G)}(G)$ to be equal to $Aut_{\gamma_2(G)}^{Z(G)}(G)$.
An Overview of the Research on Texture Based Plant Leaf Classification
Vishakha Metre,Jayshree Ghorpade
Computer Science , 2013,
Abstract: Plant classification has a broad application prospective in agriculture and medicine, and is especially significant to the biology diversity research. As plants are vitally important for environmental protection, it is more important to identify and classify them accurately. Plant leaf classification is a technique where leaf is classified based on its different morphological features. The goal of this paper is to provide an overview of different aspects of texture based plant leaf classification and related things. At last we will be concluding about the efficient method i.e. the method that gives better performance compared to the other methods.
Synthesis and Evaluation of Some Coumarin Based Schiff's Bases as Potential Antimicrobial Agents'
Vishakha Bansode,Meenakshi N. Deodhar
Journal of Chemistry , 2012, DOI: 10.1155/2012/791091
Abstract: A series of the title compounds 3-(4-(4, 5-dihydro-5-(substituted phenyl)-1H-3-pyrazolyl) phenylimino) methyl)-4-chloro-2H-chromen-2-one 5(a-g) have been synthesized. These compounds were characterized on the basis of their spectral (IR, 1H NMR) data and evaluated for antimicrobial activity in vitro against gram positive bacteria, gram negative bacteria and fungi. The compound (5b) was found to be the most active with MIC of 20 µg/ml against all the tested organisms.
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